CN104237620B

CN104237620B - voltage detection device

Info

Publication number: CN104237620B
Application number: CN201410347401.4A
Authority: CN
Inventors: 柳泽浩; 柳泽浩一
Original assignee: Hioki EE Corp
Current assignee: Hioki EE Corp
Priority date: 2009-04-30
Filing date: 2010-04-28
Publication date: 2017-04-12
Anticipated expiration: 2030-04-28
Also published as: CN104237620A

Abstract

The voltage detector of the invention is a device for detecting detection object alternating currents generated in a detection object. The voltage detector includes: a detecting electrode arranged in opposition to a detection object; a detecting section that is connected with the detecting electrode to use the reference signal as an input for outputting a detection signal changing its amplitude in accordance with both current values of a detection object current flowing according to the AC voltage and a reference current flowing according to the reference signal; and a signal extraction section for extracting a signal component of the voltage from an amplified detection signal and outputting the signal component as an output signal while generating the amplified detection signal by amplifying an isolated detection signal of a detection signal at a given gain and controlling the gain so as to cancel the reference signal and a signal component of the reference signal included in the amplified detection signal by addition or subtraction of the reference signal (reference signal output from a reference signal output section) and the amplified detection signal.

Description

Voltage check device

(the application is：Apply for artificial Zhi Electric Co., Ltd, the Chinese Application No. 201010173890.8, applying date For on 04 28th, 2010, the divisional application of entitled " voltage check device ".)

This application claims priority be on April 30th, 2009 submit to Application No. 2009-110304, in May, 2009 Application No. 2009-169731 that Application No. 2009-116546 submitted to for 13rd, on July 21st, 2009 submit to, 2009 years 8 Application No. 2010-69677 that Application No. 2009-180785 months 3 days submitted to, on March 25th, 2010 submit to, 2010 years 3 The day of Application No. 2010-69714 that Application No. 2010-69695 and on March 25th, 2010 that the moon 25 was submitted to is submitted to Present patent application, its content are incorporated in this by quoting.

Technical field

The present invention relates to the non-contact type for non-contactly being detected to the detection object alternating voltage of detection object Voltage check device.

Background technology

As this voltage check device, it is known that have patent documentation 1：Japan, No. 3158063 publication (4-6 of special permission Page, Fig. 3) disclosed in non-contact voltage measurement apparatus (hereinafter also referred to as " voltage check device ").The voltage check device sets Have：The bucking electrode covered with the detecting electrode that can be covered a part of surface of the insulant of electric wire and by detecting electrode Detection probe (sensor probe), and output assigned frequency signal agitator, by the signal of agitator is additional to inspection Electrode is surveyed, and measures the impedance between detecting electrode and the conductor of electric wire, and device (resistance value is hindered using detection：R1) survey The electric current flowed out from detecting electrode that amount causes because being additional to the voltage on conductor such that it is able to measure from electric current and impedance The voltage being affixed on conductor.

Specifically, in the voltage check device, first, in opening detection probe and via detection resistance device in the future In the state of the signal of self-oscillator is additional on detecting electrode, the electrostatic capacitance between carrying out bucking electrode and being grounded is (below, Be referred to as " the first electrostatic capacitance " in order to illustrate) measurement.As detection hinders the resistance value and the first electrostatic capacitance of device The little degree that can extremely ignore is compared in reactance, therefore is from being exported by agitator by first electrostatic capacitance being measured from Signal voltage, detection resistance device resistance value, by agitator export signal angular frequency and detection resistance two Calculate in terminal voltage.

Then, clamping electric wire and closing detection probe, the signal for carrying out device self-oscillator in future being hindered via detection is added The measurement of the electrostatic capacitance (below, being referred to as " the second electrostatic capacitance " in order to illustrate) in the state of detecting electrode.By this Sample, the second electrostatic capacitance of measurement, become the first above-mentioned electrostatic capacitance and electrostatic capacitance between detecting electrode and electric wire (with Under, be referred to as " the 3rd electrostatic capacitance " in order to illustrate) equivalent capacity, as detection hinders the resistance value of device, to compare this equivalent The little degree that can extremely ignore of reactance of electric capacity, therefore the second electrostatic capacitance is from the signal voltage, detection use exported by agitator The both end voltage of the resistance value of resistor, the angular frequency of the signal exported by agitator and detection resistance is calculated.Separately Outward, by above-mentioned first electrostatic capacitance is deducted from the second electrostatic capacitance for calculating, and the 3rd electrostatic capacitance is calculated, that is, is detected Electrostatic capacitance between electrode and the conductor of electric wire.

Then, clamp electric wire and close detection probe, obtain the signal for device self-oscillator in future being hindered via detection and add The both end voltage of device is hindered in detection in the state of detecting electrode, causing because being affixed to the voltage on conductor.From The impedance of the circuit that device is hindered via detection of conductor side observation, is the resistance value and the 3rd electrostatic capacitance of detection resistance device Reactance addition calculated value, but, the resistance value for hindering device due to detection is little compared with the reactance of the 3rd electrostatic capacitance extremely can be with The degree ignored, therefore above-mentioned impedance becomes the reactance of the 3rd electrostatic capacitance.By so, due to circulating in detection resistance device Electric current become the voltage that will be additional on conductor and carried out except the value after calculation with the reactance, therefore the two ends electricity of detection resistance device Pressure, the electric current circulated in becoming detection resistance device are multiplied by the value after the resistance value of detection resistance device.In this case, the detection It is with the both end voltage of resistor, the angular frequency of the voltage by being additional on conductor, the between detecting electrode and electric wire the 3rd quiet Electric capacity, the voltage being additional on conductor and detection hinder each parameter of the resistance value of device and are expressed.Therefore, in electricity In pressure detection means, the voltage on conductor will be additional to, the both end voltage of device, the voltage being additional on conductor will be hindered from detection Angular frequency, the 3rd electrostatic capacitance between detecting electrode and electric wire and detection resistance device resistance value in calculate, and show It is shown in display part.

The content of the invention

But, in above-mentioned voltage check device, there are following problem points.That is, in the voltage check device, it is necessary to Calculate respectively electrostatic capacitance (above-mentioned first electrostatic capacitance) between bucking electrode and ground connection, and detecting electrode and electric wire lead Electrostatic capacitance (above-mentioned 3rd electrostatic capacitance) between body, therefore there is the time-consuming expense of detection operation of the voltage being additional on conductor Problem points as power.

The present invention is suggested to solve the above problems, and be its object is to offer one kind and need not be calculated detecting electrode with inspection The electrostatic capacitance surveyed between object (being the conductor of electric wire in above-mentioned example), and it is capable of detecting when that the non-of the voltage of detection object connects The voltage check device of tactile type.

Using the present invention, using the teaching of the invention it is possible to provide it is a kind of detect detection object in the electricity of detection object alternating current that produces Pressure detection means, it is characterised in that be provided with：Detecting electrode, contrast signal output section, test section and signal extraction portion；Its In, detecting electrode is relative with detection object and arrange and carry out Capacitance Coupled with the detection object, the output of contrast signal output section Contrast signal, test section are connected to detecting electrode, meanwhile, input contrast signal simultaneously will be according to detection object electric current and with reference to electricity Stream two current values and amplitude variations detection signal output, above-mentioned detection object electric current be according to detection object alternating voltage and The electric current of circulation, above-mentioned is according to contrast signal and the electric current that circulates with reference to electric current, and signal extraction portion is so as to wrap in detection signal The amplitude of the signal component of the contrast signal for containing becomes setting like that, and controls gain amplification detection signal, from its result The signal component of detection object alternating voltage is extracted in the amplification detection signal for obtaining, and is exported as output signal.

Signal extraction portion can be provided with, and be believed with the contrast signal by exporting from contrast signal output section and the amplification detection Number add or subtract calculation, the signal component of the contrast signal included with the amplification detection signal by the contrast signal offsets that Sample and control the control circuit of gain, and the signal component quilt of the contrast signal signal included from amplification detection signal The signal of counteracting, the circuit exported as the signal component of detection object alternating voltage.

In such composition, test section be connected to carry out with detection object it is same on capacity coupled detecting electrode When, contrast signal is input into from contrast signal output section, and basis is circulated based on the detection object alternating voltage of detection object Detection object electric current and based on contrast signal circulate reference electric current two current values and amplitude variations detection signal output, Signal extraction portion detection signal is amplified with the gain that specifies and while generate amplification detection signal, with by from reference to letter The contrast signal and amplification detection signal of the output of number output section add or subtract calculations, and can be by contrast signal and amplification detection letter The signal component of number contrast signal for being included is offset and controls gain like that, while by the signal component of detection object alternating voltage Extract from amplification detection signal and export as output signal.

In this case, on an electric current road comprising the coupled capacitor (electrostatic capacitance) between detection object and detecting electrode On footpath, the electric current that circulation has the electric current produced by contrast signal and produced by detection object alternating voltage, by based on two electric currents Voltage component (signal component of the signal component and detection object alternating voltage of contrast signal) and constitute detection signal.

Therefore, even if voltage check device is unknown feelings due to the coupled capacitor between detection object and detecting electrode Under condition, for the sensitivity of detection object alternating voltage is also controlled by become fixed sensitivity, that is to say, that output signal Comprising the amplitude of signal component of detection object alternating voltage be controlled as becoming the amplitude with detection object alternating voltage Corresponding size, therefore, by detecting the voltage component that output signal is included, calculating for coupled capacitor need not be carried out Detection object alternating voltage can non-contactly be detected.

In addition, in addition, signal extraction portion can also be provided with, so that setting becomes prespecified fixed value like that The control circuit of control gain.

In such composition, test section be connected to carry out with detection object it is same on capacity coupled detecting electrode When, contrast signal is input into from contrast signal output section, and basis is circulated based on the detection object alternating voltage of detection object Detection object electric current and the reference electric current circulated based on contrast signal two current values and the detection signal of amplitude variations is defeated Go out, signal extraction portion detection signal is amplified with the gain that specifies and while generate amplification detection signal, with amplification detection The amplitude of the signal component of the relevant contrast signal included by signal becomes fixation and controls gain like that, while detection object is handed over The signal component of stream voltage is extracted from amplification detection signal and is exported as output signal.

In this case, on an electric current road comprising the coupled capacitor (electrostatic capacitance) between detection object and detecting electrode On footpath, circulate the electric current for having the electric current caused by contrast signal and being caused by detection object alternating voltage, by based on two electric currents Voltage component (signal component of the signal component and detection object alternating voltage of contrast signal) and constitute detection signal.

Therefore, voltage check device, due to the signal of the contrast signal included with amplification detection signal by signal processing part The amplitude of composition become fixation control like that amplification detection signal is generated for the gain of Insulation monitoring signal, even if therefore Coupled capacitor between detection object and detecting electrode is (capacitance regardless of coupled capacitor) in the case of unknown, amplifies The sensitivity of the signal component of the relevant detection object alternating voltage included in detection signal is also controlled by become fixed spirit Sensitivity, that is to say, that the amplitude of the signal component of the detection object alternating voltage included in output signal be controlled as becoming with The corresponding size of amplitude of detection object alternating voltage, therefore, according to being made up of the signal component of the detection object alternating voltage Output signal amplitude, correctly detection object alternating voltage can be detected.Therefore, the voltage check device can Saving calculates the time and efforts of the coupled capacitor (electrostatic capacitance) between detection object and detecting electrode and (need not carry out coupling electricity That what is held calculates), and non-contactly detection object alternating voltage is detected.

And then the judging part for performing that at least one of two judgements process judge to process can be provided with, wherein, this two Judgement is processed as：Detect the signal of the contrast signal included by any one signal in detection signal and amplification detection signal The level of composition, meanwhile, it is judged as that when the level that this detects is more than specified level normally judgement is processed for action, and The level that this detects is judged as when being less than the specified level that the judgement of remarkable action is processed.

In the state of voltage check device normally action, when detecting electrode carries out Capacitance Coupled with detection object, by The current component produced from the contrast signal of contrast signal output section output circulates between detection object and test section, from forming It is the state in being often contained in detection signal etc. and amplification detection signal by the signal component Jing that the current component is produced.Pass through So, as one by this is operating normally when detection signal etc. or amplification detection signal in the letter of contrast signal that includes The lower limit of the level of number composition (signal component produced by contrast signal) is calculated in advance as specified level, so as to pass through The letter of the relevant contrast signal that judging part is included in any one signal in detection signal etc. and amplification detection signal While the level of number composition is detected, when the level that this detects is in specified level, execution is judged as that action is normal Judgement is processed, and is judged as at least one of judgement process of remarkable action when the level that this detects is less than specified level Process, just whether the result that operator can be processed according to the judgement, the detection for carrying out the voltage in voltage check device operate The diagnosis (judgement) for often carrying out.

Further, since can make operator distinguish the detection object alternating voltage for detecting be voltage when action is normal also Voltage when being remarkable action, therefore, it is possible to improve for the reliability of the detection object alternating voltage for detecting.

And then power supply unit can be provided with, the power supply unit is by the electricity on the basis of the contrast signal from contrast signal output section The floating voltage of pressure, and drive test section.

Signal extraction portion can be provided with：Amplifying circuit, synchro detection circuit, control circuit；Wherein, amplifying circuit will be detected Signal amplifies and generates amplification detection signal, and synchro detection circuit is by using the reference letter exported from contrast signal output section Number synchronous detection, and detect represent the amplification detection signal or output signal in the signal section of contrast signal that includes The rectified signal of amplitude, control circuit control the gain of amplifying circuit according to rectified signal.

Signal component as contrast signal can be correctly detected by synchronous detection, therefore, it is possible to accurately detect Rectified signal.Thereby, it is possible to accurately by the amplitude of the signal component of the detection object alternating voltage included in output signal It is controlled to fixation such that it is able to further improve the accuracy of detection of detection object alternating voltage.

By floating voltage drive test section in the case of, and then can be provided with will test section and signal extraction portion electricity In the state of insulation, detection signal is sent to into the insulation division in signal extraction portion from test section.

Use such as shield electrode by being used as reference voltage portion, and can by detecting electrode, floating power supply, test section with And insulation division is contained in the shield electrode, and the action under quick condition, therefore, it is possible to improve CMRR (Common Mode Rejection Ratio, common-mode rejection ratio).

Due to test section being driven by floating voltage, therefore be provided with power supply unit, and the power supply unit can be used as to test section The composition of each floating voltage is supplied, wherein, above-mentioned power supply unit has the first series-connection power supplies circuit and the second series-connection power supplies circuit, the One series connection power circuit is according to the positive electricity being supplied in the positive voltage and negative voltage in contrast signal output section and signal extraction portion Pressure, and generate relative to contrast signal voltage be fixed positive voltage the first floating voltage, the second series-connection power supplies circuit root According to negative voltage, the second floating for generating the negative voltage that the first floating voltage is equal to for absolute value relative to the voltage of contrast signal is electric Pressure.

By adopting such composition, the high price part using accumulator or transformator etc. can be avoided, its result is energy Product cost is greatly reduced enough.

First series-connection power supplies circuit can be provided with：Be connected to the first resistor of positive voltage, electric current is received from the first resistor Supply and carry out the first Zener diode of action, and the first transistor, the collector terminal connection of the first transistor In positive voltage, meanwhile, the voltage of voltage regulation of the first Zener diode is transfused on base terminal, and is generated on emitter terminal One floating voltage；Second series-connection power supplies circuit can be provided with：Be connected to the second resistance of negative voltage, electricity is received from the second resistance The supply of stream and carry out second Zener diode and transistor seconds of action, the collector terminal of the transistor seconds connects Negative voltage is connected to, meanwhile, the voltage of voltage regulation of above-mentioned second Zener diode is transfused on base terminal, and on emitter terminal Generate above-mentioned second floating voltage.

By respectively constituting the first series-connection power supplies circuit and the second series electrical by resistance, Zener diode and transistor Source circuit, and can be with few part number of packages, simple and inexpensively constituted each series-connection power supplies circuit.

In order to the signal for being cancelled the signal component of contrast signal is carried as the signal component of detection object alternating voltage Take, signal extraction portion can be provided with add circuit or subtraction circuit, wherein, add circuit, will be defeated from contrast signal by adding The signal component of the contrast signal and contrast signal that go out portion's output is offset and output signal output, and subtraction circuit, will by subtracting calculation The signal component of contrast signal and contrast signal from the output of contrast signal output section is offset and output signal output.

Using this composition, can by can the circuit by as add circuit or subtraction circuit and simply form Circuit, the signal section of contrast signal and contrast signal are offset and export output signal.Therefore, it is possible to seek device Composition it is simplified while, positively output signal output.

For the signal component at least removed the frequency content of contrast signal from amplification detection signal extraction, signal extraction Portion can be provided with by the signal component of detection object alternating voltage from amplification detection signal extraction and export wave filter.

By adopting using composition of the wave filter from the signal component of amplification detection signal extraction detection object alternating voltage, Output signal can be generated with low cost while constituting simple.

In order to control for the gain of the detection signal in signal extraction portion, can be provided with will be defeated from contrast signal output section The amplitude of the contrast signal for going out changes and to the amplitude changing unit of signal extraction portion output.

Using this composition, the amplitude of the amplitude of the contrast signal after change is made relative to contrast signal before changing Multiplying power when being k, can pass through to make the amplitude of output signal being made up of the signal component of detection object alternating voltage be 1/k Times, and detection object alternating voltage is detected.Therefore, by changing multiplying power k, detection object alternating voltage can be expanded Detection range.

Further, the processing unit detected to detection object alternating voltage according to output signal can be provided with.Using the structure Into if, for example, can detect detection object alternating voltage to processing unit at certain intervals, or by the detection object for detecting Alternating voltage is shown in display device etc. as waveform such that it is able to improve convenience.

In this case, processing unit can calculate the magnitude of voltage of detection object alternating voltage according to output signal.By so, Detection object alternating voltage can be correctly detected (measure).

Contrast signal output section, can adopt be provided with the square wave generative circuit that generates square wave and the square wave is integrated and as The composition of the integrating circuit of integration square wave output, wherein, integration square wave is exported to test section as contrast signal, and square wave is made Exported to signal extraction portion for contrast signal.

Using this composition, square wave generative circuit is simply formed by using logic circuit etc., ginseng can be made Be integrally formed according to signal output portion while become simple, make the reference electric current circulated based on contrast signal, become with from The square wave identical square wave that contrast signal output section is exported to signal extraction portion.By in such manner, it is possible to (concrete device is constituted It is integrally formed for contrast signal output section) while be formed as simply constituting, in signal extraction portion, can be by with reference to letter Number positively offset (eliminate) with the signal section of contrast signal that includes in amplification detection signal such that it is able to by detection object The signal component of alternating voltage from amplification detection signal is positively extracted and is exported as output signal.

In addition, contrast signal output section is provided with the pseudo noise generative circuit for generating pseudo noise, and pseudo noise can also be made The composition exported to test section and signal extraction portion for contrast signal.

By using pseudo noise as contrast signal, the impact for being difficult to be disturbed (noise) can be become.

The voltage check device of multiple present invention can be used, line voltage distribution detection means is constituted.I.e. it is capable to set There are the multiple voltage check devices detected to the alternating voltage for being produced in the multiple circuits as detection object respectively, and calculate Go out the differential voltage of the alternating voltage detected by multiple voltage check devices, so as to obtain the circuit between multiple circuits The calculating section of voltage, as multiple voltage check devices, respectively using above-mentioned voltage check device.

Even if the circuit as detection object and to should be between the detecting electrode of circuit coupled capacitor be unknown In the case of, without the coupled capacitor (electrostatic capacitance) calculated between circuit and detecting electrode, and being capable of noncontact and correctly Line voltage distribution between detection circuit.

Description of the drawings

Here, with reference to the following drawings, the form that is embodied as of the present invention is shown.

Fig. 1 is the structure chart of the voltage check device that the first embodiment of the present invention is related to.

Fig. 2 is the circuit diagram in the floating circuit portion in voltage check device shown in Fig. 1.

Fig. 3 is the circuit diagram of the amplifying circuit in voltage check device shown in Fig. 1.

Fig. 4 is the structure chart of the voltage check device that second embodiment of the present invention is related to.

Fig. 5 is the circuit diagram of the test section in voltage check device shown in Fig. 4.

Fig. 6 be can replace contrast signal output section in voltage check device shown in Fig. 1 or Fig. 4 and use, and Fig. 1 And the block diagram of other the different contrast signal output sections shown in Fig. 4.

Fig. 7 be can replace contrast signal output section in voltage check device shown in Fig. 1 or Fig. 4 and use, and Fig. 6 The block diagram of shown other also different contrast signal output sections.

Fig. 8 is the block diagram of the line voltage distribution detection means using the voltage check device shown in Fig. 1.

Fig. 9 is the block diagram of the line voltage distribution detection means using the voltage check device shown in Fig. 4.

Figure 10 is provided with the voltage detecting of the power supply units different from the power supply unit in voltage check device shown in Fig. 1 or Fig. 4 The block diagram of the floating circuit of device.

Figure 11 is the circuit diagram of the power supply unit in floating circuit portion shown in Figure 10.

Figure 12 is the floating circuit portion of the composition for not using insulation division and the circuit diagram of differential amplifier circuit.

Figure 13 is the structure chart of the voltage check device that the 3rd embodiment of the present invention is related to.

Figure 14 is the structure chart of the voltage check device that the 4th embodiment of the present invention is related to.

Figure 15 is the structure chart of the voltage check device that the 5th embodiment of the present invention is related to.

Figure 16 is the structure chart of the voltage check device that the 6th embodiment of the present invention is related to.

Figure 17 is the structure chart of the voltage check device that the 7th embodiment of the present invention is related to.

Figure 18 is that the frequency of the voltage signal S4 of the feedback control section output from the voltage check device shown in Figure 17 is special Property figure.

Figure 19 is the benchmark of extraction signal in the signal extraction portion in the voltage check device shown in Figure 17 that becomes The frequency characteristic figure of reference signal Sr.

Figure 20 is the frequency of the Insulation monitoring signal S2 of the floating circuit portion output from voltage check device shown in Figure 17 Performance plot.

Figure 21 is the frequency of the amplification detection signal S3 generated by the amplifying circuit in voltage check device shown in Figure 17 Rate performance plot.

Figure 22 is the frequency characteristic of output signal So of the signal extraction portion output from voltage check device shown in Figure 17 Figure.

Specific embodiment

Hereinafter, referring to the drawings the embodiment of voltage check device and line voltage distribution detection means is illustrated.

【First embodiment】

First, referring to the drawings the voltage check device 101 that the first embodiment of the present invention is related to is illustrated.

Voltage check device 101 is the voltage check device of non-contact type, as shown in figure 1, being provided with floating (floating) Circuit portion 2 and main body circuit portion 3, and be configured on the basis of ground potential Vg and non-contactly detect result from detection it is right As the alternating voltage V1 (detection object alternating voltage) on 4.

As shown in figure 1, floating circuit portion 2 be provided with shield electrode 11, detecting electrode 12, power supply unit 13, test section 14 and Insulation division 15.Shield electrode 11 uses conductive material (such as metal material), used as the reference voltage portion in floating circuit portion 2 And constitute, detecting electrode 12, test section 14 and insulation division 15 are contained inside which.In addition, as described later, due to insulation division 15 with will be defeated from its secondary-side circuitry with the state with primary-side circuitry in electric insulation in the signal of its primary-side circuitry input The function of going out, therefore the position that should be covered by shield electrode 11 is to as little as primary-side circuitry, but can also adopt right The composition that secondary-side circuitry is also covered with shield electrode 11.In addition, being formed with shield electrode 11 as one in this example Peristome (hole) 11a.Detecting electrode 12 is formed as tabular as one, and to be in non-contacting state with shield electrode 11, It is equipped on the position relative with peristome 11a in shield electrode 11.In addition, detecting electrode 12 is in detection alternating voltage V1 When, Capacitance Coupled (coupling by electrostatic capacitance C0) is carried out with detection object 4 as shown in Figure 1.

Power supply unit 13, as the floating for generating the various floating voltages of (zero volt) on the basis of the voltage Vr of shield electrode 11 Power supply and constitute.In addition, power supply unit 13 using the floating voltage of generation as work applied voltage to being disposed in shield electrode 11 Each structural detail supplied.In this example as one, power supply unit 13 possesses accumulator and DC/DC exchangers (are not schemed Show) and constitute, based on the DC voltage exported from accumulator, by various floating voltages, (such as voltage Vr is DC/DC exchangers During zero volt, relative to the 1st floating voltage Vf+ that voltage Vr is positive voltage, and it is that its absolute value and the 1st are floating relative to voltage Vr 2nd floating voltage Vf- of galvanic electricity pressure Vf+ equal negative voltage.Hereinafter, also referred to as " floating voltage Vf+ ", " floating voltage Vf- ") generate as work applied voltage.In addition, though it is not shown, but using replacement accumulator, and transformation can also be passed through Device to shield electrode 11 into supplies alternating voltage with the state being electrically insulated from the outside of shield electrode 11, and by the alternating voltage The composition for DC voltage being transformed in the rectification partes glabra being arranged in shield electrode 11 and DC/DC exchangers being supplied.

While detecting electrode 12 are connected to, from contrast signal output section 31, input contrast signal Ss (joins test section 14 It is attached according to signal Ss), and amplitude (is produced by alternating voltage V1 according to the detection object electric current circulated based on alternating voltage V1 Current signal composition) Iv1 and based on contrast signal Ss circulate with reference to the electric current (current signal produced by contrast signal Ss Composition) Is1 two current values and change detection signal S1 output.Specifically, test section 14 is received relative to guarantor The voltage Vr of shield electrode 11 starts for the floating voltage Vf+ of positive voltage and for the supply of the floating voltage Vf- of negative voltage, and root According to current signal I (detection electric current) generating amplitudes, according to the electric potential difference (V1-Vr) of exchange, the detection signal S1 that changes is simultaneously Output, wherein, current signal I is with the electric potential difference (V1- for exchanging between the voltage Vr with alternating voltage V1 with shield electrode 11 Vr) corresponding current value circulation.In this case, contrast signal Ss is exported (add) extremely from contrast signal output section described later 31 Shield electrode 11.By this composition, voltage Vr is consistent with the voltage Vs of contrast signal Ss.So, above-mentioned current signal I is by because of ginseng The reference electric current Is1 produced according to signal Ss and the detection object electric current Iv1 compositions because of alternating voltage V1 generations, are believed based on the electric current The detection signal S1 of number I, also by based on voltage signal composition (hereinafter referred to as " reference voltage the composition ") Vs1 with reference to electric current Is1, Constitute with voltage signal composition (hereinafter referred to as " detection object the voltage component ") Vv1 based on detection object electric current Iv1.In addition, Test section 14 is started as benchmark due to the voltage of the shield electrode 11 changed using the voltage Vs according to contrast signal Ss And detection signal S1 is generated, therefore, the reference voltage composition Vs1 being contained in detection signal S1 becomes relative to contrast signal The voltage Vs of Ss is anti-phase signal.

In this example as one, test section 14 is as shown in Fig. 2 including integrating circuit 21 and amplifying circuit 22 and being formed. Integrating circuit 21 is provided with：In-phase input end is connected to shield electrode 11 and inverting input is connected to the computing of detecting electrode 12 and puts Big device 21a, the capacitor 21b being connected between the inverting input and outfan of operational amplifier 21a and and capacitor Resistance 21c 21b in parallel.In this case, capacitor 21b is constituted with the capacitor of 0.01 μ F or so, resistance 21c as one It is made up of the resistance of such as high resistance of 1M Ω or so.Therefore, in the integrating circuit 21, by mainly in capacitor 21b Upper circulating current signal I, and operation is integrated while current-voltage conversion is operated, generate magnitude of voltage and detection object 4 Alternating voltage V1 and the voltage Vr of shield electrode 11 between exchange electric potential difference (V1-Vr) proportionally change voltage letter Number S0.In addition, in the integrating circuit 21, only by capacitor 21b, the feedback quantity that there is near DC is decreased obviously And gain (gain) terrifically increases, due to the biasing (offset) that causes because of bias current and operational amplifier 21a saturations Danger, in order to suppress the decline of the dynamic range caused because of the saturation, and is equipped with resistance 21c.Amplifying circuit 22, voltage is believed Number S0 carries out voltage amplification using the amplification for specifying and exports as detection signal S1.In addition, though it is not shown, but can also By integrating circuit 21, by current signal I is transformed to the current-voltage conversion circuit of voltage signal and by the voltage signal for example Two circuits compositions of integration and the integrating circuit as detection signal S1 outputs.

Insulation division 15, is electrically insulated while detection signal S1 is input into and is exported as Insulation monitoring signal S2.Tool Say body, insulation division 15 as one, the structure using optical insulation element (in the present example, adopting photo-coupler as) Into, the detection signal S1 in the light emitting diode (not shown) of its primary-side circuitry will be enter as, as Insulation monitoring believe Number S2 and export from the phototransistor as its secondary-side circuitry.That is, insulation division 15 will be with detection signal S1 It is for the signal that the amplitude of homophase and amplitude and detection signal S1 is proportionally changed, defeated as Insulation monitoring signal S2 Go out.Alternatively, it is also possible to replace photo-coupler, and be made up of light emitting diode using primary-side circuitry, and secondary-side circuitry by FET (field-effect transistor) constitutes insulation division 15 to the light MOS-FET (mos field effect transistor) for constituting. In this case, in insulation division 15, its primary-side circuitry receives the supply of floating voltage Vf+, Vf- and action.In addition, detection letter In the case that number S1 is high-frequency exchange, it is also possible to constitute insulation division 15 using transformator.

As shown in figure 1, main body circuit portion 3 is provided with contrast signal output section 31, signal extraction portion 32, processing unit 33, storage Portion 34 and output section 35.In this case, contrast signal output section 31 is generated on the basis of ground potential Vg and voltage Vs is to advise Contrast signal Ss (the AC signals that frequency and amplitude are fixed that the amplitude of fixed cycle change is fixed.There is sine wave to believe as one Number), and export to shield electrode 11.By so, the voltage Vr of shield electrode 11 is defined as the voltage Vs of contrast signal Ss. That is, the voltage Vr of shield electrode 11 is become by the cycle of regulation with the state consistent with the voltage Vs of contrast signal Ss Change.In this example, the composition that contrast signal Ss is directly exported by contrast signal output section 31 to shield electrode 11 is employed, but As contrast signal Ss is AC signal, thus while it is not shown, but contrast signal output section 31 can also be configured to and passed through Contrast signal Ss is exported by capacitor to shield electrode 11.In addition, contrast signal output section 31 is also exported to signal extraction portion 32 Contrast signal Ss.In addition, the amplitude changing unit 36 being represented by dotted lines in same figure, is not included in main body circuit in this example In portion 3.Therefore, the contrast signal Ss from the output of contrast signal output section 31 is input directly into signal extraction portion 32.In addition, at this As one in example, the frequency of contrast signal Ss is defined as the high frequency of frequency of the alternating voltage V1 than detection object 4.Should In the case of, it is also possible to the allocation by contrast signal Ss is the low frequency of frequency of the alternating voltage V1 than detection object 4.

Signal extraction portion 32 is provided with amplifying circuit 41, add circuit 42, synchro detection circuit 43 and control as one Insulation monitoring signal S2 is amplified with the gain for specifying and generates amplification detection signal S3 by circuit 44, and so that amplification detection to be believed The signal component and contrast signal Ss of the contrast signal Ss included in number S3 can be by amplification detection signal S3 and contrast signal Ss's adds or subtracts calculation (in this example to add) and offset like that, gain when Insulation monitoring signal S2 is amplified by control, together When, the signal component of alternating voltage V1 is extracted into (generation) from amplification detection signal S3 and is exported as output signal S0. In this case, the signal component of the contrast signal Ss for including in so-called amplification detection signal S3, is because based on contrast signal Ss The signal component that the reference voltage composition Vs1 of detection signal S1 causes is contained in the output (adding) of shield electrode 11 (namely include in amplification detection signal S3 with contrast signal Ss for same frequency signal component).

Specifically, amplifying circuit 41 is while isolated input detection signal S2, with by exporting from control circuit 44 Control signal (specially control voltage) Sc level (DC voltage level) and the amplification that is prescribed (gain can be 1 Can also more than be less than 1) amplifying Insulation monitoring signal S2, and generate and export amplification detection signal S3.As one, such as scheme Shown in 3, amplifying circuit 41 be provided with operational amplifier 41a, be disposed in operational amplifier 41a inverting input and ground potential it Between variable resistor element (in the present example as one, be J-FET (Junction Field Effect Transistor： Junction field effect transistor.)) 41b and the resistance being disposed between the inverting input and outfan of operational amplifier 41a 41c and constitute, its entirety is constituted as in-phase amplification circuit.In this case, the resistance value of variable resistor element 41b is according to quilt The level of control signal Sc of input and change.Therefore, amplifying circuit 41 is in the level according to control signal Sc being transfused to While making its magnification change, Insulation monitoring signal S2 is amplified using the amplification and is exported as amplification detection signal S3. In addition, as variable resistor element, the element that resistance value is changed according to the voltage from outside input, it is also possible to make Constituted with element or circuit beyond J-FET.In this example as one, variable resistor element 41b is configured to, and is being transfused to The level of control signal Sc when increasing its resistance value reduce, when the level of control signal Sc is reduced, its resistance value increases.It is logical This composition is crossed, the amplification of amplifying circuit 41 increases when the level of control signal Sc increases, and drops in the level of control signal Sc Reduce when low.

Add circuit 42, (in this example, protects the voltage Vr occurred in shield electrode 11 as the input of reference signal Sr Only be attached contrast signal Ss on shield electrode 11, therefore reference signal Sr be contrast signal Ss) while input amplification detection letter Number S3, two signals S3, Sr are added, and the signal that adds obtained by adding is exported as output signal So.Should In the case of as described above, detection signal S1 by relative to contrast signal Ss be anti-phase reference voltage composition Vs1 and with exchange Voltage V1 is constituted for the detection object voltage component Vv1 of homophase.Therefore, the Insulation monitoring signal for being generated based on detection signal S1 The S2 and amplification detection signal S3 for Insulation monitoring signal S2 being amplified and being generated, also by being anti-phase relative to contrast signal Ss Signal component and with alternating voltage V1 for homophase signal component constitute.Therefore, add circuit 42, by performing two signals The addition process of S3, Sr, and it is anti-phase signal component relative to contrast signal Ss to perform constitute amplification detection signal S3 The place offset (eliminate) with reference signal Sr (as contrast signal Ss in this example) by (hereinafter also referred to " inversion signal composition ") Reason.That is, add circuit 42 plays a role as bucking circuit.In this case, include in output signal So with reference Signal components of the signal Ss for same frequency, in the amplitude and reference signal of the inversion signal composition for constituting amplification detection signal S3 The amplitude of Sr for it is identical when be completely eliminated (be eliminated) and be removed.On the other hand, with contrast signal Ss be same frequency The signal component of rate, when the amplitude of the inversion signal composition of composition amplification detection signal S3 is different from the amplitude of reference signal Sr Output signal So is residued in, is more than the amplitude of reference signal Sr in the amplitude of the inversion signal composition for constituting amplification detection signal S3 When become anti-phase with contrast signal Ss, the signal Sr on the basis of the amplitude of inversion signal composition of amplification detection signal S3 is constituted Become homophase with contrast signal Ss when below amplitude.

Synchro detection circuit 43, while output signal So and contrast signal Ss are input into, by with contrast signal Ss Output signal So is synchronized into detection, and is generated and is exported rectified signal Vd.Specifically, synchro detection circuit 43 is by same Step detection, the signal component of the contrast signal Ss included in the absolute value and output signal So of voltage is (specially with reference letter The signal component of number Ss for same frequency) amplitude increase and decrease correspondence and increase and decrease, and the contrast signal included in output signal So When the phase place of the signal component of Ss is consistent with the phase place of contrast signal Ss (during homophase) and deviate 180 ° when (when anti-phase), generate And the different rectified signal Vd of output polarity.In this example as one, synchro detection circuit 43 is generated and is exported in output letter The signal component of the regulation included in number So becomes positive polarity (positive voltage), becomes when anti-phase when being homophase with contrast signal Ss The rectified signal Vd of negative polarity (negative voltage).

Control circuit 44, generates according to the polarity of the rectified signal Vd of input and increases and decreases control signal Sc of voltage, and to Amplifying circuit 41 is exported.In this example as one, control circuit 44 makes control when the rectified signal Vd of input is positive polarity The level of signal Sc increases, and on the other hand when the rectified signal Vd of input is negative polarity, reduces the level of control signal Sc. Composition by more than, in signal extraction portion 32, for the feedback control of the gain (amplification) of amplifying circuit 41 passes through same Walk detecting circuit 43 and control circuit 44 and carried out, control circuit 44 controls the amplification of amplifying circuit 41 according to rectified signal Vd Rate, so as to constitute shaking for inversion signal composition (with the signal component that contrast signal Ss is same frequency) of amplification detection signal S3 Amplitude variation for it is fixed (become with the amplitude of the contrast signal Ss that add circuit 42 is transfused to as reference signal Sr in this example Same-amplitude).The amplitude of the inversion signal composition of amplification detection signal S3 by so, is constituted, and add circuit 42 is transfused to Reference signal Sr (in this example be contrast signal Ss) amplitude it is consistent.Therefore, add circuit 42 performs amplification detection signal S3 And the addition process of reference signal Sr, the inversion signal composition for constituting amplification detection signal S3 is offset with contrast signal Ss and (is disappeared Except), generate and output signal output So, wherein, output signal So is by the inspection produced based on the alternating voltage V1 because of detection object 4 Survey the voltage component to image current Iv1 (with the signal component that alternating voltage V1 is same frequency) to constitute.

In this case, corresponding to the size of electrostatic capacitance C0 formed between detection object 4 and detecting electrode 12, electric current letter Reference electric current Is1 and detection object electric current Iv1 included in number I is changed with same ratio, the ginseng included in detection signal S1 Also changed with same ratio according to voltage component Vs1 and detection object voltage component Vv1.Accordingly, with respect to composition amplification detection Signal S3 inversion signal composition (with contrast signal Ss for same frequency signal component) and with alternating voltage V1 for identical The signal component of frequency, two-component are also changed with same ratio, but in signal extraction portion 32, are controlled by above-mentioned feedback System, amplification detection signal S3 with constitute signal S3 inversion signal composition (signal with contrast signal Ss as same frequency into Point) amplitude and reference signal Sr (being contrast signal Ss in this example) amplitude it is consistent, given birth to by amplifying circuit 41 Into.Therefore, in the voltage check device 101 that this example is constituted, the detection object electric current Iv1's included based on output signal So Voltage component, with its amplitude independently from the size of electrostatic capacitance C0 all in shaking with the alternating voltage V1 that produces in detection object 4 Corresponding size, in theory its amplitude become the state consistent with the amplitude of the alternating voltage V1 produced in detection object 4.

Processing unit 33, is provided with A/D changers and CPU (not shown) and constitutes, and perform：By the electricity of output signal So Corrugating (level) is sampled by the sampling clock of assigned frequency and is stored in storage part 34 after being transformed to numerical data D1 Storage process, the voltage that calculates alternating voltage V1 according to numerical data D1 calculates process, and by the alternating current for calculating The output of pressure V1 outputs is processed.Storage part 34 is made up of ROM (read only memory) or RAM (random access memory) etc., in advance The voltage in processing unit 33 that is stored with calculate in processing by using voltage calculate and use chart TB.Calculate with regard to the voltage and use chart The production process of TB, illustrates to its summary.As one, by the contrast signal Ss of known voltage Vs (fixation) to guarantor In the state of shield electrode 11 is exported and carries out the feedback control using synchro detection circuit 43 and control circuit 44, by making detection The amplitude of the alternating voltage V1 produced on object 4 obtains numeral while change with the voltage step size (voltage step) for specifying Data D1, compare with the alternating voltage V1 changed in the voltage step size and by the magnitude of voltage one of numerical data D1 and alternating voltage V1 With storing, chart TB is used so as to making voltage and calculating.By this composition, processing unit 33, calculate by referring to voltage and use chart TB Obtain the magnitude of voltage of alternating voltage V1 corresponding with acquired numerical data D1 such that it is able to calculate the exchange of detection object 4 Voltage V1.Output section 35 in this example, is made up of display device as one, in the output of processing unit 33 is processed, is shown and is handed over (amplitude or virtual values) such as the waveforms or the voltage parameter that calculates of stream voltage V1.

Next, the detection for the alternating voltage V1 of detection object 4 to being carried out using voltage check device 101 is operated Illustrate.

First, it is relative with detection object 4 in non-contacting state with detecting electrode 12, make floating circuit portion 2 (or electric Pressure detection means 101 is overall) positioned at the vicinity of detection object 4.By so, as shown in figure 1, becoming in detecting electrode 12 and inspection Survey the state that electrostatic capacitance C0 is formed between object 4.In this case, the capacitance of electrostatic capacitance C0, with detecting electrode 12 and inspection The distance for surveying object 4 is inversely proportionally changed, but once after floating circuit portion 2 is arranged, in environment such as temperature is Become fixed (not changing) value under conditions of fixation.Further, since general minimum (such as several pF of the capacitance of electrostatic capacitance C0 ～tens of pF or so), therefore, even if the frequency of alternating voltage V1 is hundreds of Hz or so, between detection object 4 and detecting electrode 12 Impedance can also become very big value (number M Ω).Therefore, in the voltage check device 101, even if in detection object 4 The voltage Vr of alternating voltage V1 and shield electrode 11 differ widely in the case of (in the case that electric potential difference Vdi is big), it is also possible to The resistance to cheap products forced down are input into used in the operational amplifier 21a for constituting test section 14, in this composition, it is also possible to avoid electricity The destruction of the operational amplifier 21a that potential difference Vdi causes.

In addition, detecting electrode 12 is connected by AC deposition by electrostatic capacitance C0 with detection object 4, formed from ground potential Vg rises and arrives and be grounded through detection object 4, detecting electrode 12, test section 14, shield electrode 11 and contrast signal output section 31 The current path A (path for representing in dash-dot line in FIG) of potential Vg.Therefore, in current path A, circulate by because of ginseng The reference electric current Is1 produced according to the voltage Vs of signal Ss and the detection object electric current of the alternating voltage V1 generations because of detection object 4 The current signal I that Iv1 is constituted.

By so, in floating circuit portion 2, as shown in Figure 1, 2, the 21 integration current signal of integrating circuit of test section 14 I and generate voltage signal S0, amplifying circuit 22 amplify voltage signal S0 and as detection signal S1 export.In addition, insulation division 15 input detection signal S1, and export as the Insulation monitoring signal S2 being electrically insulated with detection signal S1.

In addition, in the signal extraction portion 32 in main body circuit portion 3, as shown in figure 1, amplifying circuit 41 is detected in isolated input While signal S2, will be exhausted with the amplification being prescribed by the voltage level of control signal Sc exported from control circuit 44 Edge detection signal S2 amplifies, and exports as amplification detection signal S3.Then, add circuit 42 is in input amplification detection signal S3 While with reference signal Sr, after performing the addition process for being added two signal S3, Sr, export as output signal So.Should In the case of, as described above, for the feedback control of the gain (amplification) of amplifying circuit 41 passes through 43 He of synchro detection circuit Control circuit 44 and carried out, constitute from amplifying circuit 41 amplification detection signal S3 inversion signal composition (with reference to letter The signal component of number Ss for same frequency) amplitude it is consistent with the amplitude of reference signal Sr (being contrast signal Ss in this example).Cause This, by the addition process in add circuit 42, the inversion signal composition for constituting amplification detection signal S3 passes through reference signal Sr It is cancelled (eliminate), that is to say, that the inversion signal composition for constituting amplification detection signal S3 is removed, by based on because of detection object The detection object electric current Iv1 that 4 alternating voltage V1 is produced voltage component (with alternating voltage V1 for same frequency signal into Point) output signal So that constitutes is output.

Next, processing unit 33 performs storage processing, numerical data D1 is transformed to while output signal So is input into And it is stored in storage part 34.Then, processing unit 33 performs voltage and calculates process.Calculate in process in the voltage, processing unit 33 exists While numerical data D1 stored in reading storage part 34, reference voltage is calculated and is obtained and the numerical data for reading with chart TB D1 corresponding alternating voltage V1.In addition, alternating voltage V1 of the processing unit 33 according to the acquirement, calculates such as alternating voltage V1's Virtual value or amplitude etc. are simultaneously stored in storage part 34.Finally, processing unit 33 performs output and processes, the friendship that will be stored in storage part 34 Virtual value or amplitude of stream voltage V1 etc., are shown in the output section 35 being made up of display device.By so, using voltage detecting The detection of the alternating voltage V1 to detection object 4 of device 101 is completed.In addition, in output is processed, it would however also be possible to employ processing unit 33 compositions that the voltage waveform of alternating voltage V1 is shown in output section 35 according to the alternating voltage V1 for obtaining.

In embodiment described above, contrast signal output section 31 exports contrast signal Ss to shield electrode 11, connects The supply of receiving floating voltage Vf+, Vf- and the test section 14 that starts, according to by detecting electrode 12 in detection object 4 and protection Between electrode 11, with and exchange between the voltage Vr of alternating voltage V1 and shield electrode 11 electric potential difference (V1-Vr) it is corresponding The electric current letter I of current value circulation, exports the detection signal S1 that amplitude is changed according to the electric potential difference (V1-Vr) of exchange, absolutely Edge 15 is input into detection signal S1 and exports as Insulation monitoring signal S2, and signal extraction portion 32 is so that in Insulation monitoring signal S2 Comprising become with the amplitude that contrast signal Ss is identical signal component be prescribed in advance amplitude (can by with contrast signal Ss add or subtract calculate and offset amplification detection signal S3 in include with the amplitude that contrast signal Ss is identical signal component) that Sample, that is to say, that become fixed such, is controlled to the amplitude of Insulation monitoring signal S2 and defeated as amplification detection signal S3 Go out, meanwhile, the amplification detection signal S3 that is controlled such by amplitude and the contrast signal from the output of contrast signal output section 31 Adding between Ss subtracts calculation, and remove amplification detection signal S3 in include with contrast signal Ss identical signal components, and Export as output signal So, processing unit 33 calculates alternating voltage V1 according to the level of output signal So, wherein, output signal So is by the electricity occurred based on detection object electric current Iv1 (because of the current component that the alternating voltage V1 of detection object 4 causing and occurring) It is pressed into a point composition.

Therefore, using the embodiment, signal extraction portion 32 control amplification detection signal S3 amplitude so that with ginseng Become fixed for the amplitude of the signal component of same frequency according to signal Ss, by using the amplification detection signal S3 and contrast signal Ss add or subtract calculate and remove amplification detection signal S3 in include with contrast signal Ss identicals signal component and as defeated Go out signal So outputs, even if the coupled capacitor between detection object 4 and detecting electrode 12 (electrostatic capacitance C0) is unknown feelings Under condition (no matter value of electrostatic capacitance C0), as the sensitivity for alternating voltage V1 is controlled as in fixed sensitivity, That is, due to the amplitude of the voltage component based on the detection object electric current Iv1 included in output signal So be controlled as in The corresponding size of amplitude of alternating voltage V1, therefore, by detecting the voltage component included in output signal So, can not enter Row electrostatic capacitance C0 is calculated, and non-contactly detects alternating voltage V1.

In addition, in the embodiment, in signal extraction portion 32, synchro detection circuit 43 is by using contrast signal The synchronous detection of Ss, detects the signal component to the contrast signal Ss about including in amplification detection signal S3 or output signal So The rectified signal Vd that is indicated of amplitude, control circuit 44 controls the gain of amplifying circuit 41 according to rectified signal Vd.Cause This, using the voltage check device 101, can be correctly detected out the signal component of contrast signal Ss by synchronous detection, As a result, the signal component due to can accurately offset the contrast signal Ss included in amplification detection signal S3, thus The signal component of the contrast signal Ss included during output signal So can be greatly reduced, therefore, it is possible to further improve exchange The accuracy of detection of voltage V1.

In addition, in the embodiment, add circuit 42 is constituted by signal extraction portion 32 as bucking circuit, wherein, It is anti-phase signal component (inversion signal relative to contrast signal Ss that add circuit 42 is performed constitute amplification detection signal S3 Composition) process offset (eliminate) with reference signal Sr (as contrast signal Ss in this example), the control of control circuit 44 amplifies The gain of circuit 41, the inversion signal composition (contrast signal included in making the amplification detection signal S3 for be transfused to add circuit 42 The signal component of Ss) can be offset by reference signal Sr.Therefore, using the voltage check device 101, can with additive circuit this The simple circuit of sample constitutes bucking circuit, therefore, it is possible to seek that device constitutes it is simplified while positively generate output signal So。

In addition, using if the embodiment, by being provided with the processing unit that alternating voltage V1 is detected according to output signal So 33, and alternating voltage V1 can be detected at certain intervals for processing unit 33 or the alternating voltage V1 for detecting is stored and protected Be stored in storage part 34, or the alternating voltage V1 that stored according to storage part 34 and the voltage waveform of alternating voltage V1 is shown in defeated Go out portion 35.

In addition, using if the embodiment, as processing unit 33 calculates alternating voltage V1 according to output signal So, because This can detect (measure) alternating voltage V1.

In addition, in above-mentioned embodiment, using the contrast signal Ss included in amplification detection signal S3 signal into Split-phase for reference signal Sr (in this example be contrast signal Ss) for it is anti-phase the characteristics of, use add circuit 42 as bucking circuit The signal component of the contrast signal Ss included in making amplification detection signal S3 is offset with contrast signal Ss, but test section 14, In insulation division 15 and amplifying circuit 41, it is also possible to make detection signal S1, Insulation monitoring signal S2 and amplification detection signal S3 Reverse-phase, or make reference signal Sr anti-phase and to bucking circuit export.In this composition, due to can also make amplification detection The signal component of the contrast signal Ss included in signal S3 is formed as homophase with contrast signal Ss, therefore, pass through in this case Use subtraction circuit as bucking circuit, and can by the signal component of the contrast signal Ss included in amplification detection signal S3 with Contrast signal Ss offsets.

In addition, in above-mentioned embodiment, employing contrast signal Ss as reference signal Sr directly to bucking circuit The composition that (being add circuit 42 in above-mentioned example) is input into, but as shown in phantom in Figure 1, it is also possible to using defeated in contrast signal Go out, by the contrast signal Ss exported from contrast signal output section 31 Amplitude be changed to k times (k is arithmetic number) in amplitude changing unit 36 after export to add circuit 42 as reference signal Sr1 Constitute.The amplitude changing unit 36 can be by for example by attenuator (attenuator) that divider resistance etc. is constituted and simply structure Into.In addition, it is also possible to by amplitude changing unit 36 by being constituted the amplifier that signal amplifies with the gain (k times) for specifying, compare The amplitude of voltage signal Sr and increase the amplitude of reference signal Sr1.In these compositions, in signal extraction portion 32, with regard to putting The amplitude of the signal component of the contrast signal Ss included by big detection signal S3, with k times after contrast signal Ss amplitude (base The amplitude of calibration signal Sr1) become consistent like that and by feedback control.In this case, the ginseng for including in amplification detection signal S3 According to signal Ss signal component be cancelled in add circuit 42 by reference signal Sr1 after k times in the state of, based on because defeated Go out the amplitude of the voltage component of the detection object electric current Iv1 that the alternating voltage V1 included in signal So causes, also with by after k times State is detected.Therefore, it is possible to by 1/k times will be formed as based on the voltage component of the detected detection object electric current Iv1, And detect alternating voltage V1.

Therefore, using this composition, by changing multiplying power k in amplitude changing unit 36, detectable (survey can be expanded Amount) alternating voltage V1 scope.For example, the incoming level of output signal So in processing unit 33 has regulation (above-mentioned It is provided with the composition of A/D changers, the incoming level of output signal So is limited according to the specified input of A/D changers) In the case of, by multiplying power k is set to numerical value 1/10, (will be contrast signal Ss direct as reference signal Sr with numerical value 1 is set to To add circuit 42 input composition) when compare, it is also possible to meet regulation output signal So incoming level while, The more high-tension alternating voltage V1 of detection (measurement).

In addition, in above-mentioned embodiment, employ by by detecting electrode 12, power supply unit 13, test section 14 and Insulation division 15 is contained in shield electrode 11, and constitutes floating circuit portion 2 in different body components from main body circuit portion 3, is being carried While high CMRR (Common Mode Rejection Ratio), the structure of the detection of the alternating voltage V1 of horizontal high voltage can be entered Into, but, in the case where need not to make test section 14 with quick condition dynamic, (for example, alternating voltage V1 is not wanted compared with low pressure or Seek the situation of high CMRR), it would however also be possible to employ do not use the composition of shield electrode 11, power supply unit 13 and insulation division 15.For this The embodiment of sample, it is described below.

【Second embodiment】

The voltage check device 102 that second embodiment of the present invention is related to is as shown in figure 4, replace voltage check device 101 floating circuit portion 2, and it is provided with detecting electrode 12 and test section 14A.Therefore, voltage check device 102 is provided with detecting electrode 12nd, test section 14A and main body circuit portion 3, and be configured to non-contactly detect the alternating current resulted from detection object 4 Pressure V1.In addition, with regard to detecting electrode 12 and main body circuit portion 3, constituted due to identical with voltage check device 101, therefore assigned Give identical symbol and the repetitive description thereof will be omitted, mainly the test section 14A different from voltage check device 101 is illustrated.

Test section 14A, with each structural detail (contrast signal output section 31, the signal extraction portion 32 for constituting main body circuit portion 3 And processing unit 33 etc.) (the generation on the basis of ground potential Vg of work applied voltage is received from power supply (not shown) in the same manner Positive voltage Vcc+ and negative voltage Vcc-) supply and action.In addition, test section 14A is as shown in figure 4, be connected to detection electricity While pole 12 be input into contrast signal Ss (contrast signal Ss is attached), and detect by the presence due to alternating voltage V1 The detection object electric current Iv1 that circulates between detecting electrode 12 and detection object 4 and due to contrast signal Ss voltage Vs it is defeated The current signal I (=Iv1+Is1) that the reference electric current Is1 for entering and circulating between detecting electrode 12 and detection object 4 is constituted, together When, export the detection signal S1 that amplitude is changed according to the current value of current signal I.In addition, current signal I can also Say the electric potential difference (V1-Vr) for exchanging that corresponds between alternating voltage V1 and the voltage Vr (=voltage Vs) of shield electrode 11 and Current signal that its amplitude is changed, namely being circulated with the current value corresponding to the electric potential difference (V1-Vr).

Test section 14A, in this example as one for example shown in Fig. 5, is provided with detection resistance 61 and differential enlarging section 62.Detection Resistance 61, while side is connected to detecting electrode 12 at one end, another side is connected on contrast signal output section 31.It is differential to put Big portion 62 is made up of the known instrument amplifier for being provided with three operational amplifier A P1～AP3 and 7 resistance R1～R7.Separately Outward, in the differential enlarging section 62, capacitor C1, C2 are connected in parallel to respectively on each resistance R6, R7, comprising operational amplifier A P3 Output stage (output stage) constitute with integrating function.In addition, in the differential enlarging section 62, each resistance R1～R7 In the resistance on symmetrical position between be kept balance (that is, R2 and R3, R4 and R5 and R6 and R7, point Identical resistance value is not defined as), and (C1, C2 are defined as identical electric capacity for capacitor C1, C2 are also kept balance Value).In addition, in differential enlarging section 62, the operation amplifier played a role as an input in differential enlarging section 62 The in-phase input end of device AP1 is connected on one end of detection resistance 61, used as another input in differential enlarging section 62 And the in-phase input end of operational amplifier A P2 for playing a role is connected on contrast signal output section 31.In the differential amplification In portion 62, when the voltage for being input into each input is set to Vin1, Vin2, detection signal S1 is represented with below equation.

S1=(Vin2-Vin1) × (1+2 × R2/R1) × R6/R4

In this case, (Vin2-Vin1) in the formula of above-mentioned S1, represents the stream by current signal I (=Iv1+Is1) Lead to and betide the voltage at the two ends of detection resistance 61.Therefore, test section 14A as described above, exports amplitude and current signal I The detection signal S1 that the current value of (=Iv1+Is1) is corresponding and is changed.

In main body circuit portion 3, detection signal S1 is amplified with the gain for specifying and generates and amplify inspection by signal extraction portion 32 Signal S3 is surveyed, and amplification detection signal can be passed through with the signal component of the contrast signal Ss that will be included in amplification detection signal S3 Adding or subtracting for S3 and contrast signal Ss is calculated and offsets such gain when control detection signal S1 amplifies, meanwhile, by alternating current The signal component of pressure V1 extracts (generation) from amplification detection signal S3 and exports as output signal So.In this case, it is so-called to put The signal component of the contrast signal Ss included in big detection signal S3, the reference voltage composition included in referring to detection signal S1 Vs1 (it is, include in amplification detection signal S3 with contrast signal Ss for same frequency signal component).

Then, in the same manner as the voltage check device 101 that processing unit 33 is related to first embodiment, by performing at storage Reason, voltage calculate process and output is processed, and calculate virtual value or amplitude of alternating voltage V1 etc., and are shown in by display dress Put the output section 35 of composition.By so, using the detection of the alternating voltage V1 to detection object 4 of voltage check device 102 Terminate.

Therefore, in the voltage check device 102 that the embodiment is related to, the voltage inspection being also related to first embodiment Survey device 101 similarly, the amplitude of amplification detection signal S3 is controlled by signal extraction portion 32 and is made in amplification detection signal S3 Comprising with contrast signal Ss for same frequency signal component amplitude for fix, and using the amplification detection signal S3 with ginseng According to signal Ss add or subtract calculate and remove include in amplification detection signal S3 with the signal of contrast signal Ss same frequencys into Divide and export as output signal So, even if so as to the coupled capacitor (electrostatic capacitance between detection object 4 and detecting electrode 12 C0 it is) (no matter value of electrostatic capacitance C0) in the case of unknown, as the sensitivity for alternating voltage V1 is controlled as in solid Fixed sensitivity, that is to say, that due to the amplitude of the voltage component based on the detection object electric current Iv1 included in output signal So It is controlled as in size corresponding with the amplitude of alternating voltage V1, therefore, by detecting the voltage included in output signal So Composition, does not carry out calculating for electrostatic capacitance C0, it is also possible to non-contactly detect alternating voltage V1.

In addition, in the voltage check device 102 that the embodiment is related to, the voltage inspection being also related to first embodiment Survey device 101 similarly, in signal extraction portion 32, synchronous detection of the synchro detection circuit 43 by using contrast signal Ss And detect that the amplitude to the signal component of the relevant contrast signal Ss included in amplification detection signal S3 or output signal So is carried out The rectified signal Vd of expression, control circuit 44 control the gain of amplifying circuit 41 according to rectified signal Vd.Therefore, using the reality If applying form, the signal component of contrast signal Ss can be correctly detected by synchronous detection, as a result, can be high-precision The signal component of the contrast signal Ss that degree ground is included in offsetting amplification detection signal S3, and thus, it is possible to output is greatly reduced The signal component of the contrast signal Ss included in signal So, therefore, it is possible to further improve the accuracy of detection of alternating voltage V1.

In addition, in the voltage check device 102 that the embodiment is related to, add circuit 42 is also made by signal extraction portion 32 Constitute for bucking circuit, wherein, add circuit 42 performs constitute amplification detection signal S3 and relative to contrast signal Ss is Anti-phase signal component (inversion signal composition) offsets the process of (elimination) with reference signal Sr (as contrast signal Ss in this example), Control circuit 44 controls the gain of amplifying circuit 41, and what is included in making the amplification detection signal S3 being transfused in add circuit 42 is anti- Phase signals composition (signal component of contrast signal Ss) can be offset by reference signal Sr.Therefore, using the embodiment, also can The so simple circuit of enough circuits with additive constitutes bucking circuit, therefore, it is possible to seek that device constitutes it is simplified while, really Output signal So is generated on the spot.

In addition, in above-mentioned voltage check device 102, also with the contrast signal included in amplification detection signal S3 The signal component of Ss relative to reference signal Sr (in this example be contrast signal Ss) for it is anti-phase the characteristics of, and make as bucking circuit With add circuit 42, the signal component of the contrast signal Ss included in amplification detection signal S3 is offset with contrast signal Ss, but It is, in test section 14A or amplifying circuit 41, it is also possible to make the reverse-phase of detection signal S1 or amplification detection signal S3, or Make reference signal Sr anti-phase and bucking circuit is exported.In this composition, due to can also make to include in amplification detection signal S3 Signal component and the contrast signal Ss of contrast signal Ss be homophase, therefore, using this composition, by subtraction circuit is made Use for bucking circuit, can be by the signal component of the contrast signal Ss included in amplification detection signal S3 and contrast signal Ss Offset.

In addition, in the above example, employ contrast signal Ss as reference signal Sr directly to bucking circuit (upper 42) composition being input into for add circuit in stating example, but as shown in phantom in Figure 4, it would however also be possible to employ it is defeated in contrast signal Go out, make contrast signal Ss's from the output of contrast signal output section 31 The structure that amplitude is exported to add circuit 42 as reference signal Sr1 after k times (k is arithmetic number) is changed in amplitude changing unit 36 Into.Using this composition, identically with voltage check device 101, by multiplying power k in change amplitude changing unit 36, and energy The scope of enough alternating voltage V1 for expanding detectable (measurement).

In addition, in the voltage check device 101 that first embodiment is related to, employing such as insulation division 15 and amplifying electricity Between road 41, between contrast signal output section 31 and add circuit 42, and contrast signal output section 31 and synchro detection circuit The composition being directly connected between 43 respectively, in addition, in the voltage check device 102 that the second embodiment is related to, employing example As between test section 14A and amplifying circuit 41, between contrast signal output section 31 and add circuit 42, and contrast signal output The composition being directly connected between portion 31 and synchro detection circuit 43 respectively, although not shown, but can also be using as needed Make the intervenient composition of buffer.In addition, above for employing the contrast signal that will export from contrast signal output section 31 The example of the composition that Ss is supplied to synchro detection circuit 43 with intact level is illustrated, and although not shown, but makees The level that contrast signal Ss is reduced to into needs using the attenuator being made up of divider resistance etc. can also be adopted simultaneously for one Composition to the supply of synchro detection circuit 43.

In addition, though it is not shown, but can also be constituted using following, i.e.,：To be made by arranging in main body circuit portion 3 For analogue signal Insulation monitoring signal S2 be transformed to numerical data A/D transformation components and will be used as being exported from contrast signal The contrast signal Ss of the analogue signal in supply signal extraction portion of portion 31 32 is transformed to the A/D transformation components of numerical data, and with numeral Process carries out all or part of composition of the process in signal extraction portion 32.In this case, it would however also be possible to employ make processing unit The composition of 33 functions with signal extraction portion 32, using this composition, can significantly reduce the number of packages of circuit block.Separately Outward, the function of processing unit 33 and the function in signal extraction portion 32 both can be realized using software, it is also possible to using hardware (DSP (Digital Signal Processor, digital signal processor) or logic array (Logic Array)) realizing.

In addition, the AC signal fixed frequency and amplitude to contrast signal output section 31 above is (for example sinusoidal as one Ripple signal) example that exports as contrast signal Ss is illustrated, but it is also possible to adopt reference as shown in Figure 6 to believe Number output section 31A like that, the composition for replacing sine wave signal and square-wave signal being exported as contrast signal Ss.Specifically, Contrast signal output section 31A, is provided with the square wave generative circuit 31a that generates square wave (square-wave signal) and by square wave (square-wave signal) Integration the integrating circuit 31b exported as integration square wave (integration square-wave signal).Contrast signal output section 31A, will be logical Cross square wave generative circuit 31a generation square-wave signal as contrast signal Ss the synchro detection circuit 43 to signal extraction portion 32 Output, meanwhile, the square-wave signal is exported as reference signal Sr to the add circuit 42 in signal extraction portion 32.In addition, ginseng According to signal output portion 31A, using the integration square-wave signal exported from integrating circuit 31b as contrast signal Ss to test section 14 (being test section 14A in voltage check device 102) output.In this case, as test section 14 (14A) is by detecting electrode 12 And be connected in series with electrostatic capacitance C0, therefore, the ginseng circulated in including the test section 14 (14A) and the circuit of electrostatic capacitance C0 According to electric current Is1, become the signal after contrast signal Ss differential.

Therefore, will be exported from contrast signal output section 31A to test section 14 (14A) by advancing with integrating circuit 31b Contrast signal Ss integrations, and square wave generative circuit is simply formed by using logic circuit (logic circuit) etc. 31a, be integrally formed can contrast signal output section 31A becomes simple, meanwhile, will be including test section 14 (14A) and quiet The reference electric current Is1 circulated in the circuit of electric capacity C0, is formed as defeated to signal extraction portion 32 with from contrast signal output section 31A The square-wave signal identical square-wave signal for going out.By in such manner, it is possible to constitute device, (specially contrast signal output section 31A is whole The composition of body) become simple, meanwhile, in signal extraction portion 32, add circuit 42 can be using reference signal Sr (in this example For contrast signal Ss) and positively the inversion signal composition relative to contrast signal Ss for constituting amplification detection signal S3 is offset (elimination) such that it is able to positively extract the signal component of alternating voltage V1 and as output signal So from amplification detection signal S3 Output, meanwhile, synchro detection circuit 43 can utilize contrast signal Ss and positively synchronize detection to output signal So.

Alternatively, it is also possible to adopt contrast signal output section 31B as shown in Figure 7 like that, pseudo noise generative circuit 31c is provided with And constitute, and the composition that pseudo noise signal is exported as contrast signal Ss.In this case, contrast signal output section 31B, will The pseudo noise signal generated by pseudo noise generative circuit 31c is as contrast signal Ss to test section 14 (14A) and signal The synchro detection circuit 43 of extraction unit 32 is exported, meanwhile, using the pseudo noise signal as reference signal Sr to signal extraction portion 32 add circuit 42 is exported.In addition, pseudo noise generative circuit 31c, moves as a linear feedback that can use M series etc. The known various shift registers of bit register (Linear Feedback Shift Register) etc. and constitute, or make Constituted with the microcomputer that pseudo noise signal is generated by software processes.By using such reference letter for constituting Number output section 31B, can realize being difficult to being interfered (noise) impact voltage check device 101 (101A).

【The configuration example of line voltage distribution detection means】

Next, the line voltage distribution detection means of the voltage check device 101 to being related to using multiple first embodiments 51 illustrate.

First, referring to the drawings the composition of line voltage distribution detection means 51 is illustrated.In addition, following to detecting three-phase (R Phase, S-phase and T-phase) example of line voltage distribution of alternating current circuit (hereinafter also referred to as " circuit ") R, S, T of three-wire system said It is bright.

Line voltage distribution detection means 51, as one for example shown in Fig. 8, is provided with the number (three with circuit R, S, T It is individual) (below, and referred to as voltage check device 101r, 101s, the 101t corresponding with each circuit R, S, T-phase of voltage check device 101 (when below, especially not distinguishing, being also referred to as " voltage check device 101 ")), calculating section 52 and display part 53, and be configured to Line voltage distribution Vrs, the line voltage distribution Vst between circuit S, T and the line between circuit R, T between circuit R, S is detected non-contactly Road voltage Vrt.

As shown in figure 8, each voltage check device 101 is respectively equipped with above-mentioned floating circuit portion 2 and main body circuit portion 3 and identical Ground is constituted, and alternating voltage Vrp, Vsp, Vtp that each circuit R, S, T are detected these circuits as detection object is (respectively Detection object alternating voltage) virtual value, and would indicate that the data of virtual value as detection data Dva, Dvb, Dvc and export. Hereinafter, for detection data Dva, Dvb, Dvc, " detection data Dv " is also referred to as when especially not distinguishing.In this example, each voltage The output section 35 of detection means 101, is made up of the dispensing device of the transmission that can carry out data, with will be input into from processing unit 33 Detection data Dva, Dvb, Dvc sent to the function of calculating section 52.In addition, in for voltage check device 101 except defeated The other structural details gone out beyond portion 35, due to identical with above-mentioned composition, therefore omit detailed description.

Calculating section 52, is provided with CPU and memorizer (not shown) and constitutes, and performs according to from each voltage check device Detection datas Dv of 101 outputs and the line voltage distribution that calculates (detect) line voltage distribution calculates process.In addition, calculating section 52 is by line Road voltage calculates the result of process and is shown in display part 53.Display part 53, in this example by the monitoring device of liquid crystal display etc. Constitute.Alternatively, it is also possible to be made up of the printing equipment of printer etc..In addition, each main body circuit portion 3 is as described below, it is mutual It is connected between becoming position (such as the basket in the main body circuit portion 3) G1 of ground potential Vg.In addition, as one, calculating Go out portion 52 and display part 53, the power circuit included by any one the main body circuit portion 3 from three main body circuit portions 3 is (not Diagram) receiving voltage supply and be operated.

Next, the detection action to line voltage distribution detection means 51 is illustrated.

First, as shown in figure 8, when being detected, in order to the exchange of circuit R is detected using voltage check device 101r Voltage Vrp, and its floating circuit portion 2 is made near circuit R, while so as to detecting electrode 12 is relative with corresponding circuit R.Equally Ground, for other voltage check device 101s, 101t, in order to detect alternating voltage Vsp, Vtp of circuit S, T, also makes each The detecting electrode 12 in floating circuit portion 2 respectively with corresponding circuit S, T-phase pair.By so, become each detecting electrode 12 with The state of electrostatic capacitance C0 (with reference to Fig. 1) is respectively formed between each circuit R, S, T, each voltage check device 101r, 101s, In 101t, the detection of alternating voltage Vrp, Vsp, Vtp of corresponding circuit R, S, T is started.In this case as described above, exist In each voltage check device 101r, 101s, 101t, the capacitance regardless of electrostatic capacitance C0 can pass through processing unit 33 And alternating voltage Vrp, Vsp, Vtp is correctly detected out.

In addition, in each voltage check device 101r, 101s, 101t, output section 35 will be calculated by processing unit 33 The virtual value of alternating voltage Vrp, Vsp, Vtp of each circuit R, S, T, respectively as detection data Dva, Dvb, Dvc and export.

Each detection data Dva, Dvb exported from each voltage check device 101, Dvc are input into and are stored in by calculating section 52 Memorizer.Then, calculating section 52 performs line voltage distribution and calculates process.Specifically, calculating section 52, by calculating each detection data The differential voltage of each virtual value of alternating voltage Vrp, Vsp represented by Dva, Dvb, and obtain (detect) between each circuit R, S Line voltage distribution Vrs.In addition, calculating section 52 is similarly, by calculating the alternating voltage represented by each detection data Dvb, Dvc The differential voltage of each virtual value of Vsp, Vtp, and the line voltage distribution Vst between each circuit S, T is obtained (detect), it is each by calculating The differential voltage of each virtual value of alternating voltage Vrp, Vtp represented by detection data Dva, Dvc, and obtain (detect) each electricity Line voltage distribution Vrt between road R, T.In addition, calculating section 52 makes line voltage distribution Vrs, Vst, Vrt for calculating be shown in display part 53.

So, using the line voltage distribution detection means 51, by using voltage check device 101, even if each voltage Between detecting electrode 12 in detection means 101 and each circuit R, S, the T as the detection object of each voltage check device 101 Coupled capacitor (electrostatic capacitance C0) is in the state of unknown, it is also possible to without calculating these coupled capacitors, and non-contactly correct Detect line voltage distribution Vrs, Vst, Vrt.

【Other configuration examples of line voltage distribution detection means】

Next, to being illustrated using line voltage distribution detection means 51A of multiple above-mentioned voltage check devices 102.

First, referring to the drawings the composition of line voltage distribution detection means 51A is illustrated.In addition, for line voltage distribution 51 identical of detection means is constituted, and gives identical symbol and the repetitive description thereof will be omitted.In addition, following to detecting three-phase three-wire system The example of line voltage distribution of circuit R, S, T illustrate.

Line voltage distribution detection means 51A, as one for example shown in Fig. 9, is provided with the number with circuit R, S, T (three) voltage check device 102 (below, and referred to as voltage check device 102r corresponding with each circuit R, S, T-phase, 102s, 102t (being also referred to as " voltage check device 102 " when below, especially not distinguishing)), calculating section 52 and display part 53, and be configured to Non-contactly can detect between the line voltage distribution Vrs between circuit R, S, the line voltage distribution Vst between circuit S, T and circuit R, T Line voltage distribution Vrt.

Each voltage check device 102, as shown in figure 9, being respectively equipped with above-mentioned detecting electrode 12, test section 14A and main body Circuit portion 3 and constitute in the same manner, each circuit R, S, T are detected as detection object these circuits alternating voltage Vrp, The virtual value of Vsp, Vtp (respectively detection object alternating voltage), and would indicate that the data of virtual value as detection data Dva, Dvb, Dvc and export.In this example, the output section 35 of each voltage check device 102, by the transmission of the transmission that can carry out data Device is constituted, with the function of sending detection data Dva, Dvb being input into from processing unit 33, Dvc to calculating section 52.In addition, The other structures element in addition to output section 35 in for voltage check device 102, due to identical with above-mentioned composition, because This omits detailed description.In addition, for calculating section 52 and display part 53, due to above-mentioned 51 phase of line voltage distribution detection means Together, therefore also omit detailed description.

Next, the detection action to line voltage distribution detection means 51A is illustrated.

First, as shown in figure 9, when being detected, in order to the exchange of circuit R is detected using voltage check device 102r Voltage Vrp, and make its detecting electrode 12 near circuit R and relative.Similarly, for other voltage check device 102s, 102t, in order to detect alternating voltage Vsp, Vtp of circuit S, T, also make each detecting electrode 12 respectively with corresponding circuit S, T-phase It is right.Electrostatic capacitance C0 is respectively formed between each detecting electrode 12 and each circuit R, S, T by so, becoming (with reference to Fig. 4) State, in each voltage check device 102r, 102s, 102t, alternating voltage Vrp, Vsp, Vtp of corresponding circuit R, S, T Detection be started.In this case as described above, in each voltage check device 102r, 102s, 102t, no matter electrostatic capacitance The capacitance of C0 how, alternating voltage Vrp, Vsp, Vtp can be correctly detected out by processing unit 33.

In addition, in each voltage check device 102r, 102s, 102t, output section 35 will be calculated by processing unit 33 The virtual value of alternating voltage Vrp, Vsp, Vtp of each circuit R, S, T, respectively as detection data Dva, Dvb, Dvc and export.

Each detection data Dva, Dvb exported from each voltage check device 102, Dvc are input into and are stored in by calculating section 52 Memorizer.Then, calculating section 52 performs line voltage distribution and calculates process, by calculating the friendship represented by each detection data Dva, Dvb The differential voltage of each virtual value of stream voltage Vrp, Vsp, and the line voltage distribution Vrs between each circuit R, S is obtained, in addition, by calculating Go out the differential voltage of each virtual value of alternating voltage Vsp, Vtp represented by each detection data Dvb, Dvc, and obtain each circuit S, Line voltage distribution Vst between T, in addition, by calculating respectively having for alternating voltage Vrp, Vtp represented by each detection data Dva, Dvc The differential voltage of valid value, and obtain the line voltage distribution Vrt between each circuit R, T.In addition, calculating section 52 makes the line voltage distribution for calculating Vrs, Vst, Vrt are shown in display part 53.

So, using line voltage distribution detection means 51A, by using voltage check device 102, even if each voltage Between detecting electrode 12 in detection means 102 and each circuit R, S, the T as the detection object of each voltage check device 102 Coupled capacitor (electrostatic capacitance C0) is in the state of unknown, it is also possible to without calculating these coupled capacitor, and non-contactly just Line voltage distribution Vrs, Vst, Vrt are detected really.

【Variation】

In addition, above to as the floating electricity generated used in the voltage check device 101 that first embodiment is related to The power supply unit 13 of pressure Vf+, Vf-, and the composition of accumulator and DC/DC exchangers (not shown) is provided with, and replace accumulator And the state for passing through transformator to be electrically insulated from the outside of shield electrode 11 to shield electrode 11 in supply alternating voltage, and utilize The alternating voltage is transformed to DC voltage and supplies the structure of DC/DC exchangers by the rectification partes glabra being arranged in shield electrode 11 Into being illustrated, but, as shown in Figure 10, it would however also be possible to employ using the composition of power supply unit 13A, wherein, power supply unit 13A according to Supply from power supply (not shown) constitute main body circuit portion 3 each structural detail (contrast signal output section 31, signal extraction portion 32 with And processing unit 33 etc.) work applied voltage (the positive voltage Vcc+ generated on the basis of ground potential Vg and negative voltage Vcc-), Generate shield electrode 11 voltage Vr, namely on the basis of the voltage Vs of contrast signal Ss (zero volt) above-mentioned floating voltage Vf +、Vf-。

As shown in figure 11, power supply unit 13A is provided with the first series-connection power supplies circuit 61 and the second series-connection power supplies circuit 62, its In, the first series-connection power supplies circuit 61, shield electrode 11 voltage Vr be zero volt when, generated according to positive voltage Vcc+ relative to The voltage Vr of shield electrode 11 is the floating voltage Vf+ of fixed positive voltage, the second series-connection power supplies circuit 62, according to negative voltage Vcc- and to generate the voltage Vr relative to shield electrode 11 be floating voltage of its absolute value equal to the negative voltage of floating voltage Vf+ Vf- (is equal to the voltage of the absolute value of the difference of floating voltage Vf+ and voltage Vr) with the absolute value of the difference of voltage Vr.Specifically Say, the first series-connection power supplies circuit 61, be provided with bipolar npn transistor npn npn 61a (hereinafter also referred to as " the first transistor 61a "), One resistance 61b, the first Zener diode 61c (voltage of voltage regulation Vz) and the first capacitor 61d.In this case, the first transistor The collector terminal of 61a is connected to the supply lines of positive voltage Vcc+, and emitter terminal is connected to the output lead of floating voltage Vf+ Road, base terminal are connected to the cathode terminal of the first Zener diode 61c.In addition, the anode terminal of the first Zener diode 61c It is connected to the supply lines of voltage Vr.One end of first resistor 61b is connected to the collector terminal of the first transistor 61a, meanwhile, The other end is connected to base terminal.One end of first capacitor 61d is connected to the emitter terminal of the first transistor 61a, meanwhile, The other end is connected to the supply lines of voltage Vr.

Second series-connection power supplies circuit 62, is provided with positive-negative-positive bipolar transistor 62a (hereinafter also referred to as " transistor seconds 62a "), second resistance 62b, the second Zener diode 62c (with the first Zener diode 61c identical voltage of voltage regulation Vz) and Second capacitor 62d.In this case, the voltage Vbe between the base-emitter terminal of transistor seconds 62a is defined as and One transistor 61a is identical, meanwhile, collector terminal is connected to the supply lines of negative voltage Vcc-, and emitter terminal is connected to floating Galvanic electricity presses the outlet line of Vf-, base terminal to be connected to the anode terminal of the second Zener diode 62c.In addition, the second voltage stabilizing two The cathode terminal of pole pipe 62c is connected to the supply lines of voltage Vr.One end of second resistance 62b is connected to transistor seconds 62a Collector terminal, meanwhile, the other end is connected to base terminal.One end of second capacitor 62d is connected to transistor seconds 62a Emitter terminal, meanwhile, the other end is connected to the supply lines of voltage Vr.

Composition by more than, in power supply unit 13A, the first series-connection power supplies circuit 61 generates the electricity that floats from positive voltage Vcc+ Pressure Vf+ (=Vr+Vz-Vbe) is simultaneously exported, meanwhile, the second series-connection power supplies circuit 62 generates floating voltage Vf- from negative voltage Vcc- (=Vr-Vz+Vbe) is simultaneously exported.Specifically, in the first series-connection power supplies circuit 61, the first Zener diode 61c is electric from first Voltage of voltage regulation Vz is produced on cathode terminal after the supply of resistance 61b reception electric currents, base terminal is defined as voltage of voltage regulation Vz's The first transistor 61a, the generation voltage (Vz- on the basis of the anode terminal of the first Zener diode 61c on emitter terminal Vbe).Therefore, the first series-connection power supplies circuit 61, voltage when generating on the basis of ground potential Vg are the floating of (Vr+Vz-Vbe) Galvanic electricity is pressed Vf+ and is exported.In addition, in the second series-connection power supplies circuit 62, the second Zener diode 62c is connect from second resistance 62b Voltage of voltage regulation Vz is produced on anode terminal after receiving the supply of electric current, base terminal is defined as second crystal of voltage of voltage regulation Vz Pipe 62a, generation voltage (- Vz+Vbe) on the basis of the anode terminal of the second Zener diode 62c on emitter terminal.Cause This, the second series-connection power supplies circuit 62, floating voltage of voltage when generating on the basis of ground potential Vg for (Vr-Vz+Vbe) Vf- is simultaneously exported.

That is, power supply unit 13A, as long as positive voltage Vcc+ and voltage (Vr- are not up in voltage (Vr+Vz-Vbe) Vz+Vbe in the state of) being not up to negative voltage Vcc-, voltage Vr changes, just while the variation of voltage Vr is followed, raw Into absolute value | Vz-Vbe | relative to voltage Vr it is equal as the floating voltage Vf+ of positive voltage and as the floating of negative voltage Galvanic electricity is pressed Vf- and is exported.Therefore, each circuit in floating circuit portion 2 receives the supply of each floating voltage Vf+, the Vf- and normal Be operated as a result, normally exporting Insulation monitoring signal S2 from floating circuit portion 2.Therefore, by using the power supply Portion 13A, can avoid the high price part using accumulator or transformator etc., and its result is that voltage detecting dress is greatly reduced Put 1 product cost.In addition, though it is not shown, but known excessively stream can also be added in each series-connection power supplies circuit 61,62 Protection circuit or known overvoltage crowbar.

In addition, above to insulation division 15, and the detection that will be detected using test section 14 are configured with floating circuit portion 2 The composition that signal S1 is transformed to the Insulation monitoring signal S2 being electrically insulated with detection signal S1 and is exported is illustrated, but, As shown in figure 12, it would however also be possible to employ the composition of insulation division 15 is not configured in floating circuit portion 2.In this composition, it is also possible to adopt Constituted with following, i.e.,：From floating circuit portion 2 is by detection signal S1 and represents the signal of voltage Vr in couples to main body circuit portion 3 Output, is configured at the input detection signal S1 and voltage Vr of differential amplifier circuit 63 in main body circuit portion 3, meanwhile, replace insulation Detection signal S2 and would indicate that the structure that the detection signal S2a of the difference of detection signal S1 and voltage Vr is exported to amplifying circuit 41 Into.

The differential amplifier circuit 63, as one for example shown in Figure 12, can use operational amplifier 63a, input resistance 63b, input resistance 63c, the feedback resistance 63d of operational amplifier 63a and resistance 63e and constitute, wherein, input resistance 63b is disposed between the inverting input of operational amplifier 63a and the amplifying circuit 22 in floating circuit portion 2, and input resistance 63c matches somebody with somebody Between the in-phase input end of operational amplifier 63a and the shield electrode 11 in floating circuit portion 2, resistance 63e is disposed in computing Between the in-phase input end and ground potential Vg of amplifier 63a.In addition, as in the composition shown in the Figure 12 to floating circuit Each structural detail in portion 2 supplies the power supply of each floating voltage Vf+, Vf-, can use any one of above-mentioned power supply unit 13,13A Kind.

In addition, for contrast signal output section 31, as shown in figure 11, it would however also be possible to employ by contrast signal output section 31 In add and be configured to operational amplifier A P4 of voltage follower circuit (Voltage Follower Circuit), and overall make Play a role for new contrast signal output section, so as to the contrast signal Ss that will be generated using contrast signal output section 31 is with lower The composition of impedance output.

In embodiment described above, following form is illustrated, i.e.,：With the amplification that amplifying circuit 41 is exported The amplitude of the signal component of the contrast signal included by detection signal, become by from contrast signal output section 31 (or 31A or The contrast signal that 31B) exports and the amplification detection signal of the output of amplifying circuit 41 add or subtract calculations, and the contrast signal and this The value that the signal component of the contrast signal included by amplification detection signal is cancelled like that, and controls the gain of amplifying circuit 41, And from amplification detection signal, the signal that the signal component of the contrast signal included by the signal is cancelled is used as detection object The signal component of alternating voltage and extracted.In addition, it is also possible to the amplification detection signal institute that amplifying circuit 41 is exported Comprising contrast signal signal component amplitude, become prespecified fixed value and control the increasing of amplifying circuit 41 like that Benefit, and the signal component at least frequency content of contrast signal removed from amplification detection signal extraction.For such enforcement Form, it is described below.

【3rd embodiment】

The voltage check device 103 that 3rd embodiment of the present invention is related to is the voltage check device of non-contact type, such as Floating circuit portion 2 and main body circuit portion 3A are provided with shown in Figure 13, and are configured to non-contactly detect with ground potential The alternating voltage V1 (detection object alternating voltage) produced in detection object 4 on the basis of Vg.In addition, except main body circuit portion 3A Beyond the interior composition of signal extraction portion 32A and the action of processing unit 33A, other are and the voltage check device 101 shown in Fig. 1 Identical is constituted and action, therefore simultaneously the repetitive description thereof will be omitted to give identical symbol, mainly to voltage check device 101 not Same signal extraction portion 32A and processing unit 33A is illustrated.

Signal extraction portion 32A, as shown in fig. 13 that one like that, be provided with amplifying circuit 41, synchro detection circuit 43A, control Circuit 44A processed and wave filter 45, and the signal with contrast signal Ss as same frequency included with amplification detection signal S3 The amplitude of composition becomes fixed amplitude (prespecified amplitude) like that, and Insulation monitoring signal S2 is amplified and amplification detection is generated Signal S3, meanwhile, remove and contrast signal Ss identical signal components from amplification detection signal S3, and as output signal So and export.In this case, the signal component of the contrast signal Ss included by so-called amplification detection signal S3, is according to reference The output (adding) to shield electrode 11 of signal Ss and letter that the reference voltage composition Vs1 that included by detection signal S1 is produced Number composition (that is, amplification detection signal S3 included with contrast signal Ss for same frequency signal component).

Specifically, amplifying circuit 41 is exported from control circuit 44A with basis while isolated input detection signal S2 Control signal (specially control voltage) Sc level (DC level) and be prescribed amplification (gain can both be 1 with On, it is also possible to less than 1) amplifying Insulation monitoring signal S2, so as to generating amplification detection signal S3 and exporting.As amplifying circuit 41, can be in the same manner as first embodiment using the circuit shown in Fig. 3.

Synchro detection circuit 43A, while amplification detection signal S3 is input into from amplifying circuit 41, exports from contrast signal Portion 31 is input into contrast signal Ss, and synchronizes detection to amplification detection signal S3 by using contrast signal Ss, and gives birth to Into rectified signal Vd and export.

Control circuit 44A, according to the voltage and target voltage Ve of the rectified signal Vd of input (voltage that is internally generated or Voltage of the person from outside input, in this example as one be the outside input from control circuit 44A voltage) and generate control Signal Sc is simultaneously exported.Specifically, control circuit 44A, increases level when the voltage of rectified signal Vd is less than target voltage Ve Height, reduces level when the voltage of rectified signal Vd is higher than target voltage Ve, so as to output control signal Sc.By more than Constitute, in signal extraction portion 32A, the feedback control of the gain (amplification) to amplifying circuit 41 passes through synchro detection circuit 43A and control circuit 44A and carried out, control circuit 44A, to constitute the inversion signal composition of amplification detection signal S3 (with ginseng According to signal Ss for same frequency signal component) amplitude become fixed as, and electricity is amplified according to rectified signal Vd controls The amplification on road 41.In this case, as the prespecified amplitude, can be using arbitrary value.In addition, making processing unit Voltage in 33A calculates the aftermentioned voltage used in processing when calculating with chart TB, is made according to numerical data D1, Wherein, numerical data D1 is as prespecified amplitude, and in synchro detection circuit 43A and control circuit using the value of the employing In the state of 44A carries out feedback control to the amplification of amplifying circuit 41, the data obtained by processing unit 33A.

Wave filter 45, the amplification detection signal S3 exported from amplifying circuit 41 is input into, meanwhile, from the amplification detection signal The signal component of alternating voltage V1 is extracted in S3 and is exported as output signal So.For example, wave filter 45 is by passive filtering electricity Road (Passive Filter Circuit) or active filter circuit (Active Filter Circuit) are constituted, and are prevented and ginseng According to signal Ss passing through for the signal component of same frequency, and make the detection produced based on the alternating voltage V1 by detection object 4 Voltage component (with the signal component that alternating voltage V1 is same frequency) to image current Iv1 passes through, wherein, passive filter circuit Or active filter circuit is configured to band filter (Bandpass Filter) or low pass filter (Low-Pass Filter). By this composition, signal extraction portion 32A, generate by output signal So constituted based on the voltage component of detection object electric current Iv1 And export, wherein, detection object electric current Iv1 is the electric current produced by the alternating voltage V1 of detection object 4.

In the voltage check device 103, according to electrostatic capacitance C0 formed between detection object 4 and detecting electrode 12 Size, what current signal I was included is changed in the same scale with reference to electric current Is1 and detection object electric current Iv1, detection The reference voltage composition Vs1 and detection object voltage component Vv1 included by signal S1 is also changed in the same scale.Cause This, for constitute amplification detection signal S3 inversion signal composition (with contrast signal Ss for same frequency signal component) and with Signal components of the alternating voltage V1 for same frequency, two compositions are also changed in the same scale, but, in signal extraction In portion 32A, by above-mentioned feedback control, amplification detection signal S3 (is believed with reference with the inversion signal composition for constituting signal S3 The signal component of number Ss for same frequency) amplitude become fixed as, and pass through amplifying circuit 41 and generate.Therefore, at this In the voltage check device 103 that example is constituted, the voltage component of the detection object electric current Iv1 included based on output signal So, nothing By electrostatic capacitance C0 size how, its amplitude becomes corresponding with the amplitude of the alternating voltage V1 produced in detection object 4 Size (proportional size).Therefore, from output signal So of signal extraction portion 32A outputs, become its amplitude and detect right As the signal that the amplitude of 4 alternating voltage V1 proportionally changes.

Processing unit 33A is provided with A/D changers and CPU (not shown) and constitutes, and performs storage process, voltage and calculate place Reason and output are processed, wherein, it is (electric to the voltage waveform of output signal So using the sampling clock of assigned frequency that storage is processed It is flat) it is sampled and is transformed to numerical data D1 and is stored in the process of storage part 34, it is according to the numeral that voltage calculates process Data D1 and calculate the process of alternating voltage V1, output process be will calculate alternating voltage V1 output process.Storage part 34 It is made up of ROM or RAM etc., and the voltage being previously stored with processing unit 33A calculates the voltage used in processing and calculates with figure Table TB.

For the voltage in the embodiment calculates being made sequentially with chart TB, its summary is illustrated.As one Example, the gain (amplification) for amplifying circuit 41 feedback control by synchro detection circuit 43A and control circuit 44A Carried out, and control circuit 44A is to be constituted the inversion signal composition of amplification detection signal S3 (with contrast signal Ss as same frequency Signal component) amplitude become fixed (prespecified amplitude) like that, and amplifying circuit is controlled according to rectified signal Vd In the state of 41 amplification, occur the amplitude of the alternating voltage V1 produced in detection object 4 with the voltage step size for specifying Obtain numerical data D1 while change, and compare with the alternating voltage V1 changed by the voltage step size and by numeral Data D1 are together stored with the magnitude of voltage of alternating voltage V1, use chart TB by being so made voltage and calculating.By this composition, locate Reason portion 33A is calculated with chart TB by referring to voltage and is obtained the electricity of the alternating voltage V1 corresponding with numerical data D1 for obtaining Pressure value such that it is able to calculate the alternating voltage V1 of detection object 4.Output section 35, in this example as one by display device structure Into, and in the output of processing unit 33A is processed, the waveform for making alternating voltage V1 or the voltage parameter (amplitude or virtual value) for calculating Show.

Next, the detection action to the alternating voltage V1 for detection object 4 is carried out using voltage check device 103 Illustrate.

In the same manner as first embodiment, from the output of insulation division 15 and the detection signal S1 electric insulations in floating circuit portion 2 Insulation monitoring signal S2.In the signal extraction portion 32A of main body circuit portion 3A, as shown in figure 13, amplifying circuit 41 is exhausted in input While edge detection signal S2, the level of control signal Sc exported from control circuit 44A with basis and the amplification that is prescribed, Insulation monitoring signal S2 is amplified, becomes fixed for the amplitude of the signal component of same frequency with contrast signal Ss so as to generate Amplification detection signal S3 is simultaneously exported.

As one, first, synchro detection circuit 43A be input into amplification detection signal S3 and contrast signal Ss while, Detection is synchronized to amplification detection signal S3 by using contrast signal Ss, and is generated rectified signal Vd and is exported, wherein, inspection Ripple signal Vd is the increase and decrease of the amplitude of the signal component of the contrast signal Ss included according to amplification detection signal S3 by voltage and increases The signal for subtracting.

Next, control circuit 44A generates control signal according to the voltage and target voltage Ve of the rectified signal Vd of input Sc is simultaneously exported.Specifically, control circuit 44A, increases level when the voltage of rectified signal Vd is less than target voltage Ve, The voltage of rectified signal Vd reduces level when being higher than target voltage Ve, so as to output control signal Sc.Composition by more than, In signal extraction portion 32A, for amplifying circuit 41 gain (amplification) feedback control by synchro detection circuit 43A and Control circuit 44A and carried out, control circuit 44A is constituting the inversion signal composition of amplification detection signal S3 (with contrast signal Ss for same frequency signal component) amplitude become fixed (prespecified amplitude.Voltage calculates being made with chart TB When amplitude) like that, and the amplification of amplifying circuit 41 is controlled according to rectified signal Vd.By so, amplifying circuit 41 will be defeated The Insulation monitoring signal S2 for entering amplifies, and generating becomes fixed for the amplitude of the signal component of same frequency with contrast signal Ss The amplification detection signal S3 of (above-mentioned prespecified amplitude) is simultaneously exported.Then, wave filter 45 will be being exported from amplifying circuit 41 Amplification detection signal S3 be input into while, from amplification detection signal S3 extract alternating voltage V1 signal component and conduct Output signal So and export.

Next, processing unit 33A performs storage processing, numerical data D1 is transformed to simultaneously while input/output signal So It is stored in storage part 34.Then, processing unit 33A performs voltage and calculates process.Calculate in process in the voltage, processing unit 33A reads Go out to be stored in numerical data D1 of storage part 34, meanwhile, reference voltage is calculated with chart TB and is obtained and the numerical data for reading D1 corresponding alternating voltage V1.In addition, alternating voltage V1s of the processing unit 33A according to the acquirement, and calculate such as alternating voltage Virtual value or amplitude of V1 etc. are simultaneously stored in storage part 34.Finally, processing unit 33A performs output and processes, and makes to be stored in storage part Virtual value or amplitude of 34 alternating voltage V1 etc. are shown in the output section 35 being made up of display device.By so, using electricity The detection of the alternating voltage V1 of the detection object 4 of pressure detection means 103 terminates.Alternatively, it is also possible to adopt in output is processed, place Reason portion 33A makes the voltage waveform of alternating voltage V1 be shown in the composition of output section 35 according to the alternating voltage V1 for obtaining.

In the embodiment, contrast signal output section 31 exports contrast signal Ss to shield electrode 11, receives the electricity that floats The supply of pressure Vf+, Vf- and the test section 14 that is operated, export electric potential difference of the amplitude according to exchange according to current signal 1 (V1-Vr) the detection signal S1 being changed, wherein, current signal I is by detecting electrode 12 and in detection object 4 and protection Between electrode 11, with and exchange between the voltage Vr of alternating voltage V1 and shield electrode 11 electric potential difference (V1-Vr) it is corresponding The current signal circulated by current value, the input detection signal S1 of insulation division 15 are simultaneously exported as Insulation monitoring signal S2, are believed What number extraction unit 32A was included with Insulation monitoring signal S2 becomes pre- with the amplitude of the signal component of contrast signal Ss same frequencys The amplitude that first specifies like that, become fixed such, and control the amplitude of Insulation monitoring signal S2 and as amplification detection signal S3 and export, meanwhile, the amplification detection signal S3 so controlled by amplitude and the ginseng exported from contrast signal output section 31 Adding or subtract calculation according to signal Ss, and the signal component with contrast signal Ss same frequencys included by amplification detection signal S3 Remove, so as to export as output signal So.

Therefore, using the embodiment, by signal extraction portion 32A with the letter with contrast signal Ss as same frequency The amplitude of number composition becomes fixed and controls the amplitude of amplification detection signal S3 like that, even if in detection object 4 and detecting electrode Coupled capacitor (electrostatic capacitance C0) between 12 is (value regardless of electrostatic capacitance C0) in the case of unknown, be also controlled by for Sensitivity for alternating voltage V1 becomes fixed sensitivity, that is, the detection for being controlled as being included based on output signal So is right The amplitude of the voltage component of image current Iv1 becomes size corresponding with the amplitude of alternating voltage V1, therefore, by detecting output Voltage component included by signal So, without carrying out calculating for electrostatic capacitance C0, it is also possible to non-contactly detect alternating current Pressure V1.

In addition, in the embodiment, in signal extraction portion 32A, synchro detection circuit 43A is by using with reference to letter The synchronous detection of number Ss, and detect shaking for the signal component of the relevant contrast signal Ss for representing that amplification detection signal S3 is included The rectified signal Vd of width, control circuit 44A control the gain of amplifying circuit 41 according to rectified signal Vd.Therefore, adopting should If embodiment, the signal component of contrast signal S can be correctly detected out by synchronous detection, as a result, can The amplitude controlling of the signal component of the accurately contrast signal Ss included by amplification detection signal S3 is fixation, accordingly, it is capable to Enough accuracy of detection for further improving alternating voltage V1.

In addition, as the signal component that alternating voltage V1 is extracted from amplification detection signal S3 and generating the handss of output signal So Method, it would however also be possible to employ carry out the maneuver of Digital Signal Processing in processing unit 33A to amplification detection signal S3, using the enforcement shape If state, by being configured to using friendship can be extracted by the wave filter 45 that the known filter circuit with above-mentioned characteristic is constituted Stream voltage V1, constitute it is simple meanwhile, it is capable to low cost generate by the voltage produced according to detection object electric current Iv1 into Divide output signal So for constituting.In addition, using if the embodiment, by changing target voltage Ve, can change detectable Alternating voltage V1 scope.

In addition, using if the embodiment, detecting the place of alternating voltage V1 by being provided with according to output signal So Reason portion 33A, can detect alternating voltage V1 at certain intervals to processing unit 33A, or the alternating voltage V1 for making to detect It is stored in storage part 34 and is preserved, or the electricity of alternating voltage V1 is made according to the alternating voltage V1 for being stored in storage part 34 Corrugating is shown in output section 35.

In addition, in the embodiment, processing unit 33A calculates the magnitude of voltage of alternating voltage V1 according to output signal So.Make For one, processing unit 33A is input into by the voltage component (frequency i.e. with alternating voltage V1 produced according to detection object electric current Iv1 Voltage component of the rate for same frequency) output signal So that constitutes, and its numerical data D1 is obtained, use is calculated by referring to voltage Chart TB obtains the magnitude of voltage of the alternating voltage V1 corresponding with numerical data D1 for obtaining, and calculates the exchange of detection object 4 Voltage V1.Therefore, using the embodiment, it is capable of detecting when the magnitude of voltage of alternating voltage V1 itself.

In the 3rd embodiment described above, employ by by detecting electrode 12, power supply unit 13, test section 14 with And insulation division 15 is contained in shield electrode 11, and floating circuit portion 2 is not constituted with main body circuit portion 3, so as to carry consubstantiality While high CMRR (Common Mode Rejection Ratio), the structure of the detection of the alternating voltage V1 of horizontal high voltage can be entered Into, but, when test section 14 need not be made to be operated with quick condition, (for example, alternating voltage V1 is not compared with low pressure or not When being required high CMRR), it is also possible to using not using shield electrode 11, power supply unit 13 and absolutely in the same manner as the second embodiment The composition of edge 15.Hereinafter, such embodiment is illustrated.

【4th embodiment】

As shown in figure 14, the voltage check device 104 that the 4th embodiment of the invention is related to, replaces the 3rd embodiment The floating circuit portion 2 of the voltage check device 103 being related to, and it is same with the voltage check device 102 that the second embodiment is related to Be provided with detecting electrode 12 and test section 14A.Therefore, voltage check device 104 is provided with detecting electrode 12, test section 14 and master Body circuit portion 3A, and the alternating voltage V1 produced in being configured to non-contactly detect detection object 4.In addition, for inspection Electrode 12 and main body circuit portion 3A are surveyed, is constituted identically with the voltage check device 103 that the 3rd embodiment is related to, for detection Portion 14, is constituted identically with the voltage check device 102 that the second embodiment is related to, thus is given identical symbol and omitted weight Multiple explanation.

The voltage check device 103 that multiple 3rd embodiments can be utilized to be related to, the electricity being related to first embodiment Pressure detection means 101 similarly constitutes the line voltage distribution detection means 51 shown in Fig. 8.In addition, can implement using multiple four The voltage check device 104 that form is related to, constitutes Fig. 9 institutes in the same manner as the voltage check device 102 being related to the second embodiment Line voltage distribution detection means 51A shown.

In order to improve for the reliability of the alternating voltage for detecting, it is also possible to arrange the detection for checking (diagnosis) voltage (measurement) action whether function of normally carrying out.Hereinafter, such embodiment is illustrated.

【5th embodiment】

The voltage check device 105 that 5th embodiment of the present invention is related to is the voltage check device of non-contact type, such as Shown in Figure 15, floating circuit portion 2 and main body circuit portion 3B are provided with, and are configured to non-contactly detect with ground potential Vg On the basis of and the alternating voltage V1 (detection object alternating voltage) that produces in detection object 4.In addition, except in main body circuit portion 3B Beyond the action of the processing unit 33B being inside provided with wave filter 38 and main body circuit portion 3B, other are and the voltage detecting shown in Fig. 1 101 identical of device is constituted and action, therefore, give identical symbol the repetitive description thereof will be omitted, mainly to voltage detecting The different part of device 101 illustrates.

Wave filter 38 be optionally make with contrast signal Ss for same frequency signal component by wave filter (be used as One is band filter), as shown in phantom in Figure 15, using as from insulation division 15 to the input point in signal extraction portion 32 The Insulation monitoring signal S2 inputs that A points are detected, meanwhile, extract the signal of the contrast signal Ss included by Insulation monitoring signal S2 Composition Ss2 is simultaneously exported to processing unit 33B.

Processing unit 33B is provided with A/D changers and CPU (not shown) and constitutes, and performs storage process, voltage and calculate place Reason and output are processed, wherein, it is (electric to the voltage waveform of output signal So using the sampling clock of assigned frequency that storage is processed It is flat) it is sampled and is transformed to numerical data D1 and is stored in the process of storage part 34, it is according to the numeral that voltage calculates process Data D1 calculate the process of alternating voltage V1, and output processes the process that the alternating voltage V1 for being to calculate is exported.In addition, processing unit 33B plays a role as judging part, and the voltage waveform of the signal component Ss2 exported from wave filter 38 is transformed to digital number According to, and (DC level after the rectification of the amplitude level or signal component Ss2 of signal component Ss2 is (straight to detect its level The absolute value of stream voltage)), it is electric by the level Va (being amplitude level as) and prespecified regulation that detect to this Flat Vre is compared, and performs the diagnostic process of the detection action for the alternating voltage V1 in voltage check device 105.

In this case, in voltage check device 105,12 He of detecting electrode in the state of device is normally operated When detection object 4 has carried out Capacitance Coupled, become the electric current produced by the contrast signal Ss exported from contrast signal output section 31 Signal I (specially with reference to electric current Is1) circulates between detection object 4 and floating circuit portion 2, is produced by reference electric current Is1 Signal component Jing be often contained in the state in Insulation monitoring signal S2 and amplification detection signal S3.Accordingly, as one, pass through The lower limit of the above-mentioned level Va of the contrast signal Ss included by Insulation monitoring signal S2 when in advance be operating normally this, as rule Determine level Vre and theoretical property ground or tentatively calculate and be stored in storage part 34, processing unit 33B is by following judgements process At least one process (in this example be two kind judgements process as one) is performed as above-mentioned diagnostic process, by so, The action that voltage check device 105 can be diagnosed is normal (normally carrying out the detection action of alternating voltage V1) or abnormal (normally not carrying out the detection action of alternating voltage V1), wherein, judgement is processed, and is the signal in the contrast signal Ss for detecting The level Va of composition Ss2 is judged as when being more than specified level Vre that the action of device is that normal (action is normal) judgement is processed, Being judged as when specified level Vre is less than with the level Va in the signal component Ss2 for detecting, the action of device has generation exception Danger (remarkable action) judgement process.

The voltage detecting dress that the basic action of the voltage check device 105 is related to the first embodiment shown in Fig. 1 Put 101 action it is identical.In the action, wave filter 38 is consecutively carried out while isolated input detection signal S2, is extracted The signal component Ss2 of the contrast signal Ss included by Insulation monitoring signal S2 the action to processing unit 33B outputs, processing unit Storage in 33B, with first embodiment is processed and voltage is calculated to be processed and simultaneously perform using the letter from the output of wave filter 38 The diagnostic process of number composition Ss2.In the diagnostic process, processing unit 33B is first by the voltage waveform of the signal component Ss2 of input It is transformed to numerical data, and detects the level Va (being the amplitude level of signal component Ss2 in this example) of signal component Ss2, And the level Va that detects this and specified level Vre read from storage part 34 are compared.Then, processing unit 33B, at this When result of the comparison is level Va for more than specified level Vre, it is judged as that the action of device is normal (action is normal), in electricity When flat Va is less than specified level Vre, it is judged as that the action of device has abnormal (remarkable action), and the judged result is stored in Storage part 34.Terminated by such diagnostic process.

Finally, processing unit 33B performs output and processes, and will be stored in the virtual value or amplitude of the alternating voltage V1 of storage part 34 Deng being together shown in the output section 35 that is made up of display device with the judged result in diagnostic process.By so, using voltage The detection of the alternating voltage V1 to detection object 4 of detection means 105 terminates.Alternatively, it is also possible to adopt following composition, i.e.,： During output is processed, when judged results of the processing unit 33B in diagnostic process is judged as that action is normal, by the effective of alternating voltage V1 Value or amplitude etc. are shown in output section 35, when the judged result in diagnostic process is judged as remarkable action, only make diagnostic process In judgment result displays in output section 35, and virtual value or amplitude of alternating voltage V1 etc. are not shown in the structure of output section 35 Into.

Using the embodiment, process as processing unit 33B performs judgement, therefore, operator can be sentenced according to this The disconnected result for processing and carry out the detection action of the voltage in voltage check device 105 whether the diagnosis for normally carrying out (sentenced It is disconnected), wherein, judgement is processed, and is to detect the signal component Ss2 of relevant contrast signal Ss that Insulation monitoring signal S2 is included Level Va (amplitude level of signal component Ss2) while, be compared with specified level Vre, so as to judge voltage detecting The action of device 105 is normal or abnormal process.Therefore, using the embodiment, due to distinguish can operator Voltage when the alternating voltage V1 not detected is the voltage or remarkable action when action is normal, therefore, it is possible to improve for The reliability of the alternating voltage V1 for detecting.

In addition, being detected according to the A points in the input point as signal extraction portion 32 here, illustrating using processing unit 33B The Insulation monitoring signal S2 for going out, performs the example of the composition of the diagnosis of voltage check device 105 and is illustrated, but, such as The above-mentioned signal component for being produced by reference electric current Is1 like that, is not only contained in Insulation monitoring signal S2, is also contained in amplification detection Signal S3.Accordingly it is also possible to the amplification detected according to the B points in the output point as amplifying circuit 41 using processing unit 33B Detection signal S3 and perform the composition of diagnostic process.In this composition, as shown in phantom in Figure 15, wave filter 38 is defeated from B points While entering amplification detection signal S3, the signal component of the contrast signal Ss included by amplification detection signal S3, and conduct are extracted Signal component Ss2 and to processing unit 33B export.Processing unit 33B, the Insulation monitoring signal S2 detected in A points with basis and hold The situation of the diagnosis of row voltage check device 105 similarly, performs the diagnosis using the signal component Ss2 from the output of wave filter 38 Process, be judged as that when the level Va of signal component Ss2 is more than specified level Vre the action of device is that normally (action is just Often), it is judged as when level Va is less than specified level Vre that the action of device is present abnormal (remarkable action), and the judgement is tied Fruit is stored in storage part 34.As specified level Vre now, calculated in the regular event of voltage check device 105 in advance The lower limit of the above-mentioned level Va of the contrast signal Ss included by amplification detection signal S3 and use.

In addition, in voltage check device 105, in regular event, for the gain (amplification) of amplifying circuit 41 Feedback control is carried out by synchro detection circuit 43 and control circuit 44, constitute amplification detection signal S3 inversion signal into Divide the amplitude of (with the signal component that contrast signal Ss is same frequency) to be controlled as, add with being transfused to as reference signal Sr The amplitude of the contrast signal Ss of method circuit 42 is identical amplitude, by so, in add circuit 42, constitutes amplification detection letter The inversion signal composition of number S3 is offset (elimination) by contrast signal Ss.That is, the not only benchmark included by output signal So The level (such as amplitude level) of the signal component of signal Sr (being with reference to wire size Ss in this example), and from synchro detection circuit The level (DC level) of the rectified signal Vd of 43 outputs also becomes low level.On the other hand, for example floating circuit portion 2, or Person for when producing abnormal in the feedback control action of the gain (amplification) of amplifying circuit 41 (voltage check device 105 it is dynamic When making abnormal), not only the level of the signal component of reference signal Sr included by output signal So becomes high level, and from same The level (DC level) of the rectified signal Vd of the step output of detecting circuit 43 also becomes high level.

Accordingly it is also possible to constituted using following, i.e.,：Processing unit 33B, according to the C in the output point as add circuit 42 Output signal So that detects of point and the D points rectified signal Vd that detects in the output point as synchro detection circuit 43 At least one signal, and perform the composition of the diagnosis of voltage check device 105.In this case, held according to output signal So In the composition of row diagnosis, as shown in phantom in Figure 15, wave filter 38 extracts output while from C point input/output signal So The signal component of the contrast signal Ss included by signal So, and export to processing unit 33B as signal component Ss2.Based on C In the diagnostic process of output signal So that point is detected, processing unit 33B with based on the Insulation monitoring signal S2's detected in A points On the contrary, when the level Va of signal component Ss2 is below specified level Vre, being judged as that the action of device is during diagnostic process Normally (action is normal), when level Va exceedes specified level Vre, it is judged as that the action of device has that abnormal (action is different Often), and by the judged result it is stored in storage part 34.As specified level Vre now, voltage check device is calculated in advance The higher limit of the above-mentioned level Va of the during 105 regular event contrast signal Ss included by output signal So and use.

In addition, in the composition that diagnosis is performed according to rectified signal Vd, as shown in phantom in Figure 15, processing unit 33B is from D While point input rectified signal Vd, in the same manner as the diagnostic process based on output signal So detected in C points, believe in detection When level (for the level the also serves as level Va and illustrates) Va of number Vd is below specified level Vre, it is judged as device Action be normal (action is normal), when level Va exceedes specified level Vre, be judged as that the action of device is present abnormal (remarkable action), and the judged result is stored in into storage part 34.As specified level Vre now, voltage inspection is calculated in advance Survey device 105 regular event when rectified signal Vd above-mentioned level Va higher limit and use.

【6th embodiment】

The voltage check device 106 that 6th embodiment of the present invention is related to, is provided with 2 He of floating circuit portion as shown in figure 16 Main body circuit portion 3C, and the alternating voltage V1 produced in being configured to non-contactly detect detection object 4.

The voltage check device 106 that 6th embodiment of the present invention is related to is the voltage check device of non-contact type, such as Floating circuit portion 2 and main body circuit portion 3C are provided with shown in Figure 16, and are produced in being configured to non-contactly detect detection object 4 Raw alternating voltage V1.Composition in main body circuit portion 3C, is examined with the voltage shown in Figure 15 in addition to signal extraction portion 32A Survey 105 identical of device to constitute, the composition of signal extraction portion 32A is the voltage check device being respectively shown in Figure 13, Figure 14 103rd, 104 identicals are constituted, and as the explanation of its composition and action repeats, therefore are omitted.

【7th embodiment】

In addition, even if the voltage check device 107 that the 7th embodiment as shown in figure 17 is related to is like that, adopting will be in root Export (add) to shield electrode 11 while voltage signal S4 is generated according to Insulation monitoring signal S2, and with voltage signal S4's Voltage V4 carries out the composition of feedback control like that close to alternating voltage V1, with first, second and the 5th each enforcement shape The composition that the basic composition of the voltage check device 101,102 and 105 that state is related to is used together, it is also possible to non-contactly detect Go out the alternating voltage V1 of detection object 4, and, in the same manner as voltage check device 105, processing unit 33B can according to A, B, Each signal that C, D point is detected any one and perform the diagnostic process to voltage check device 107.

Hereinafter, the voltage check device 107 that the embodiment is related to is illustrated from Figure 17 with reference to Fig. 5～Figure 22.Separately Outward, for 106 identical of voltage check device being related to the 6th embodiment is constituted, give identical symbol and omit repetition Explanation.

Voltage check device 107 is the voltage check device of non-contact type, is provided with floating circuit portion 2 and master as shown in figure 17 Body circuit portion 3D, and be configured to non-contactly detect the friendship produced in detection object 4 on the basis of ground potential Vg Stream voltage V1 (detection object alternating voltage).

As shown in figure 17, floating circuit portion 2 be provided with shield electrode 11, detecting electrode 12, power supply unit 13, test section 14 and Insulation division 15, and identical with voltage check device 105,106 constitute.In the floating circuit portion 2, test section 14 according to with The current signal I (detection electric current) circulated by the corresponding current value of electric potential difference (V1-Vr) of exchange, generates its amplitude according to friendship The electric potential difference (V1-Vr) of stream and the detection signal S1 that changes simultaneously are exported.In this case, from 31 Jing of contrast signal output section described later Contrast signal Ss is exported (add) to shield electrode 11 from capacitor 31a, meanwhile, export from feedback control section described later 37 (adding) voltage signal S4.By this composition, voltage Vr becomes voltage (feedback voltage) V4 and contrast signal of voltage signal S4 The resultant voltage of the voltage Vs of Ss.By so, above-mentioned current signal I, by the reference electric current produced by contrast signal Ss Is1, current signal composition (hereinafter also referred to as " FB the current components ") Ib1 produced by voltage signal S4 and by detection object Detection object electric current Iv1 that 4 alternating voltage V1 is produced and constitute, based on the detection signal S1 of current signal I, also by being based on Reference voltage composition Vs1, the voltage signal composition based on FB current component Ib1 with reference to electric current Is1 is (hereinafter also referred to as " FB is electric Be pressed into point ") the Vb1 and detection object voltage component Vv1 based on detection object electric current Iv1 and constitute.Further, since detection The voltage of the shield electrode 11 changed with the voltage V4 by referring to the voltage Vs and voltage signal S4 of signal Ss by portion 14 is made On the basis of carry out action and generate detection signal S1, therefore, the reference voltage composition Vs1 included by detection signal S1 becomes relative It is anti-phase signal in contrast signal Ss, the FB voltage components Vb1 included by detection signal S1 also becomes relative to voltage signal S4 is anti-phase signal.

Insulation division 15, is electrically insulated while detection signal S1 is input into and is exported as Insulation monitoring signal S2.With On the floating circuit portion 2 that constitutes like that, have in the wide frequency band range from low frequency (number Hz) paramount frequency (hundreds of Hz) Flat frequency characteristic, and as described above, detect and circulated with current value corresponding with the electric potential difference (V1-Vr) of exchange Current signal I (detection electric current), so as to generate the Insulation monitoring that its amplitude changes according to the electric potential difference (V1-Vr) of the exchange Signal S2 is simultaneously exported.

As shown in figure 17, main body circuit portion 3D is provided with contrast signal output section 31, signal extraction portion 32, processing unit 33B, deposits Storage portion 34, output section 35, amplitude changing unit 36 and feedback control section 37.In this case, contrast signal output section 31 generates ginseng Export according to signal Ss (AC signal that frequency and amplitude are fixed) and via capacitor 31a to shield electrode 11.In the enforcement shape In state, as one, frequency fs of contrast signal Ss is defined in as described later more than can respond feedback control section 37 In frequency band W1,2 frequency band W3 (with reference to Figure 18).Amplitude changing unit 36 is (electric for be connected in series two as one by attenuator Resistance 36a, 36b) constitute, and while the voltage Vr using shield electrode 11 is input into as voltage signal Sr, change (k times：K is Arithmetic number) its amplitude export as reference signal Sr1.

Signal extraction portion 32, is provided with amplifying circuit 41, add circuit 42, synchro detection circuit 43 and control as one Circuit 44, Insulation monitoring signal S2 is amplified with the gain for specifying and amplification detection signal S3 is generated, and by controlling insulation inspection The gain during amplification of signal S2 is surveyed, output signal So being made up of the signal component of alternating voltage V1 is generated as described later simultaneously Output, wherein, the control of the gain during amplification of Insulation monitoring signal S2 is can pass through amplification detection signal S3 and benchmark Signal Sr1's adds or subtracts calculation (in this example as add), and the reference letter included by amplification detection signal S3 The signal of the contrast signal Ss included by the signal component (hereinafter also referred to as the first signal component) and reference signal Sr1 of number Ss Composition (hereinafter also referred to as secondary signal composition) is offset like that and is carried out.In this case, so-called amplification detection signal S3 bags First signal component of the contrast signal Ss for containing, is the output (adding) to shield electrode 11 according to contrast signal Ss and by examining Survey signal component that the reference voltage composition Vs1 that included of signal S1 produce (that is, amplification detection signal S3 included with reference Signal components of the signal Ss for same frequency).In addition, second letter of the contrast signal Ss that included of so-called reference signal Sr1 Number composition, is the reference included with reference signal Sr1 according to the output (adding) to shield electrode 11 of contrast signal Ss Signal components of the signal Ss for same frequency.

Two signal S3, Sr1 are carried out while amplification detection signal S3 and reference signal Sr1 is input into by add circuit 42 Add, and the signal that adds obtained by adding is exported as output signal So.In this case, as described above, detect Signal S1, by being anti-phase reference voltage composition Vs1 relative to contrast signal Ss, be anti-phase FB electric relative to voltage signal S4 It is pressed into point Vb1 and constitutes for the detection object voltage component Vv1 of homophase with alternating voltage V1.Therefore, according to detection signal S1 And generate Insulation monitoring signal S2 and by Insulation monitoring signal S2 amplify and generate amplification detection signal S3, also by relative to Contrast signal Ss is anti-phase signal component, relative to voltage signal S4 be anti-phase signal component and with alternating voltage V1 Signal component for homophase is constituted.In this case, amplification detection signal S3 is controlled as, and what is itself included believes relative to reference The amplitude of number Ss in anti-phase the first signal component (hereinafter also referred to as " inversion signal composition "), by it is aftermentioned it is final like that into (will by the amplitude of the secondary signal composition of the contrast signal Ss included with reference signal Sr1 exported from amplitude changing unit 36 Amplitude after K times of the amplitude of contrast signal Ss：K × Ss) identical amplitude.

On the other hand, as the voltage Vr of voltage signal Sr is the voltage V4 of voltage signal S4 and reference letter as described above The resultant voltage of the voltage Vs of number Ss, therefore, reference signal Sr1 that k times of the amplitude of voltage signal Sr is generated, by relative In the signal component (signal after k times of amplitude by contrast signal Ss) that contrast signal Ss is homophase, and relative to voltage signal S4 is constituted for the signal component (by the signal after k times of the amplitude of voltage signal S4) of homophase.

Therefore, by using add circuit 42 two signal S3, Sr1 the process that adds, constitute amplification detection signal S3 The inversion signal composition (the first signal component) of contrast signal Ss and relative to constitute reference signal Sr1 contrast signal Ss be same The secondary signal composition (hereinafter also referred to as " in-phase signal composition ") of phase is cancelled (eliminate).Therefore, output signal So, including Relative to voltage signal S4 be anti-phase signal component and relative to alternating voltage V1 for homophase signal component and constitute amplify The signal component of detection signal S3, and be the signal component of homophase and the letter of composition reference signal Sr1 relative to voltage signal S4 Number composition (by the signal after k times of the amplitude of voltage signal S4) and constitute.

Synchro detection circuit 43, while input/output signal So and contrast signal Ss, by using contrast signal Ss Detection is synchronized to output signal So, and is generated rectified signal Vd and is exported.Control circuit 44, generates voltage according to input The polarity of rectified signal Vd and control signal Sc that increases and decreases simultaneously are exported to amplifying circuit 41.

Composition by more than, in signal extraction portion 32, for the feedback control of the gain (amplification) of amplifying circuit 41 System is carried out, control circuit 44 by synchro detection circuit 43 and control circuit 44, to constitute the anti-of amplification detection signal S3 The amplitude of phase signals composition (being same frequency and the first anti-phase signal component with contrast signal Ss) becomes fixed like that (at this In example, to become and be constituted the in-phase signal composition of reference signal Sr1 for being transfused to add circuit 42 (with contrast signal Ss as phase The secondary signal composition of same frequency and homophase) amplitude identical amplitude it is such), and according to rectified signal Vd control amplifying circuit 41 amplification.The amplitude of the inversion signal composition of amplification detection signal S3 by so, is constituted, and add circuit 42 is transfused to Reference signal Sr1 in-phase signal composition amplitude it is consistent.Therefore, add circuit 42 is generated as above output signal So And export, wherein, output signal So is by being anti-phase signal component relative to voltage signal S4, be same relative to alternating voltage V1 The signal component (being the signal component for constituting amplification detection signal S3 above) of phase, and relative to voltage signal S4 for homophase Signal component (constituting the signal component of reference signal Sr1) is constituted.

In this case, the size according to electrostatic capacitance C0 formed between detection object 4 and detecting electrode 12, electric current letter What number I was included is changed in the same scale with reference to electric current Is1 and detection object electric current Iv1, and detection signal S1 is included Reference voltage composition Vs1 and detection object voltage component Vv1 also changed in the same scale.Therefore, for composition is put Big detection signal S3 inversion signal composition (with contrast signal Ss for same frequency signal component) and with alternating voltage V1 be The signal component of same frequency, two compositions are also changed in the same scale, but, in signal extraction portion 32, pass through Above-mentioned feedback control, amplification detection signal S3 with constitute the amplitude of the inversion signal composition (the first signal component) of signal S3 with Constitute the amplitude of in-phase signal composition (secondary signal composition) of reference signal Sr1 unanimously, and pass through 41 quilt of amplifying circuit Generate.Therefore, in the composition of this embodiment, the voltage of the detection object electric current Iv1 included based on output signal So into The signal component for dividing, constituting amplification detection signal S3 (is anti-phase signal component and and alternating current relative to voltage signal S4 Signal components of the pressure V1 for homophase), the size regardless of electrostatic capacitance C0, its amplitude all become and generation in detection object 4 The alternating voltage V1 sizes corresponding with the difference of voltage signal S4.In addition, the composition benchmark letter included by output signal So Number Sr1 relative to voltage signal S4 for homophase signal component, be to be produced with electrostatic capacitance C0 independently from the size originally Signal component.Therefore, output signal So becomes the signal not affected by the size of electrostatic capacitance C0.

Feedback control section (voltage generation circuit) 37, by isolated input detection signal S2 and amplifies, and generates voltage V4 (anti- Feedthrough voltage) voltage signal S4 and export (add) to shield electrode 11.In this case, feedback control section 37 and floating circuit portion 2 shield electrode 11, detecting electrode 12, test section 14 and insulation division 15 form feedback control loop together, and by carrying out so that Electric potential difference Vdi of the voltage Vr of alternating voltage V1 and shield electrode 11 reduces the amplification for amplifying Insulation monitoring signal S2 like that and moves Make, and generate voltage signal S4.In the embodiment, as one, feedback control section 37 be provided with ac amplifier circuit 37a, Phase compensating circuit 37b and booster circuit 37c and constitute.Here, ac amplifier circuit 37a, is believed by isolated input detection Number S2 is simultaneously amplified and generates voltage signal V4a.In this case, ac amplifier circuit 37a generates voltage by amplification action The voltage letter that the absolute value of value is corresponding with the increase reduction of the absolute value of the magnitude of voltage of Insulation monitoring signal S2 and is changed Number V4a.

Phase compensating circuit 37b, in order to seek the stabilisation (prevent vibration) of feedback control action, and input voltage signal V4a is simultaneously exported as voltage signal V4b after adjusting its phase place.Booster circuit 37c, uses booster transformer and structure as one Into, and by with specify multiplying power by voltage signal V4b boost (increasing absolute value by not changing polarity), and generate voltage Signal S4 is simultaneously exported to shield electrode 11.In addition, booster circuit 37c, its output impedance is defined as high impedance.So constitute Feedback control section 37, the voltage signal S4 that generating amplitude is changed with the frequency characteristic shown in Figure 18 are simultaneously exported.According to the frequency Rate characteristic, feedback control section 37 is for the signal (exchange of the frequency of the frequency band W1 of the lower frequency side in the frequency band W1 that can be responded, 2 Voltage V1) followed well, and generate the voltage signal S4 with alternating voltage V1 identical voltage V4 and export.In addition, Signal (the alternating current of the frequency included for the frequency band W2 of the high frequency side in the frequency band W1 that can be responded, 2 by feedback control section 37 Pressure V1), the not up to voltage signal S4 of the voltage V4 of alternating voltage V1 is generated because gain is not enough and is exported.In addition, feedback control Portion processed 37 is not followed on earth for the signal (including contrast signal Ss) of the frequency band W3 more than frequency band W2, and generates voltage V4 almost Voltage signal S4 for zero volt is simultaneously exported.

Processing unit 33B, performs storage process, voltage and calculates process, output process and diagnostic process, wherein, at storage Reason is the voltage waveform (level) of output signal So to be sampled and is transformed to digital number using the sampling clock of assigned frequency The process of storage part 34 is stored according to D1, and it is the place of alternating voltage V1 to be calculated according to numerical data D1 that voltage calculates process Reason, output process be will calculate alternating voltage V1 output process, diagnostic process be based on the signal from wave filter 38 into Divide the process of the level Va of Ss2.In storage part 34, it is previously stored with used in the voltage of processing unit 33B calculates process Voltage is calculated with chart TB and specified level Vre used in diagnostic process.

Next, entering to detection action using voltage check device 107, alternating voltage V1 for detection object 4 Row explanation.

First, it is relative with detection object 4 with non-contacting state with detecting electrode 12, make floating circuit portion 2 (or Voltage check device 1B entirety) positioned at the vicinity of detection object 4.By so, as shown in figure 17, become detecting electrode 12 with The state of electrostatic capacitance C0 is formed between detection object 4.In this case, the capacitance of electrostatic capacitance C0, with detecting electrode 12 Inversely proportionally it is changed with the distance of detection object 4, but, after floating circuit portion 2 is arranged, in the ring of temperature etc. Become fixed value (not changing) under conditions of border is certain.Further, since general minimum (such as several pF of the capacitance of electrostatic capacitance C0 ～tens of pF or so), therefore, even if the frequency of alternating voltage V1 is hundreds of Hz or so, between detection object 4 and detecting electrode 12 Impedance also become very big value (number M Ω).Therefore, in the voltage check device 107, even if in the friendship of detection object 4 In the situation (the big situation of electric potential difference Vdi) that the voltage Vr of stream voltage V1 and shield electrode 11 differs widely, it is also possible to constituting The resistance to cheap product for forcing down is input into used in the operational amplifier 21a (with reference to Fig. 2) of test section 14, can also in this composition Avoid the destruction of operational amplifier 21a caused by electric potential difference Vdi.

In addition, connected by AC deposition via electrostatic capacitance C0 by detecting electrode 12 and detection object 4, and formed from connecing Earth potential Vg is risen via detection object 4, detecting electrode 12, test section 14, shield electrode 11, capacitor 31a, contrast signal output Portion 31 and feedback control section 37 and the current path A (paths shown in Figure 17 chain lines) of the ground potential Vg that arrives.Therefore, exist Under the working condition in floating circuit portion 2 and main body circuit portion 3, the circulation in current path A has current signal I, wherein, electric current Reference electric current Is1s of the signal I by the voltage Vs generations because of contrast signal Ss, the inspection of the alternating voltage V1 generations because of detection object 4 Survey to image current Iv1 and the voltage V4 generations because of voltage signal S4 from feedback control section 37 to shield electrode 11 that export from FB current components Ib1 is constituted.

By so, in floating circuit portion 2, as shown in Figure 17 and Fig. 2, electric current is believed by the integrating circuit 21 of test section 14 Number I integration and generate voltage signal S0, voltage signal S0 is amplified and is exported as detection signal S1 by amplifying circuit 22.Separately Outward, insulation division 15, are input into detection signal S1 and are exported as the Insulation monitoring signal S2 being electrically insulated with detection signal S1.

In addition, in main body circuit portion 3, feedback control section 37 generates voltage signal S4 according to the Insulation monitoring signal S2 And export to shield electrode 11.In this case, 37 generating amplitude of feedback control section is changed with the frequency characteristic shown in Figure 18 Voltage signal S4, i.e., become in low-frequency band W1 and alternating voltage V1 identical amplitudes, in high frequency band W3, amplitude is zero, In middle frequency band W2 amplitude with frequency rising and from alternating voltage V1 identicals state to zero voltage for gradually decreasing Signal S4, and export to shield electrode 11.Amplitude changing unit 36, by voltage Vr (the voltage signal S4 produced in shield electrode 11 Voltage V4 and contrast signal Ss voltage Vs resultant voltage) be input into as voltage signal Sr, and by change (k times) its Amplitude, and export as reference signal Sr1 of the frequency characteristic shown in Figure 19.

In addition, feedback control section 37 is made as above action, and generate the voltage letter of the frequency characteristic shown in Figure 18 Number S4 is simultaneously exported to shield electrode 11, therefore, floating circuit portion 2 is as described above according to alternating voltage V1 and voltage signal S4 Electric potential difference Vdi and the Insulation monitoring signal S2 that generates, become with regard to alternating voltage V1 and voltage signal S4 signal component (with Alternating voltage V1 identical frequency contents), amplitude is special with the frequency contrary with the frequency characteristic of voltage signal S4 (with reference to Figure 18) Property (with reference to Figure 20) and the signal that changes.That is, floating circuit portion 2 generates Insulation monitoring signal S2 and exports, wherein, absolutely Edge detection signal S2 as shown in figure 20, in low-frequency band W1, due to by by the voltage V4 of voltage signal S4 be feedback controlled to Alternating voltage V1 identicals voltage and electric potential difference Vdi is zero, therefore amplitude is zero, in high frequency band W3, due to being believed by voltage The voltage V4 of number S4 is almost nil and electric potential difference Vdi becomes alternating voltage V1, therefore becomes proportional to alternating voltage V1 and shake Width, in middle frequency band W2, with frequency rising and the state from zero is incrementally increased to the amplitude in frequency band W3.In letter In number extraction unit 32, as described above, for amplifying circuit 41 gain (amplification) feedback control by synchronous detection electricity Road 43 and control circuit 44 and carried out, control circuit 44, to constitute the inversion signal composition of amplification detection signal S3 (with reference Signal Ss is same frequency and the first anti-phase signal component) amplitude become fixed like that (in this example, to become and be constituted The in-phase signal composition of reference signal Sr1 of add circuit 42 is transfused to (with that contrast signal Ss is same frequency and homophase Binary signal composition) amplitude identical amplitude it is such), and according to rectified signal Vd control amplifying circuit 41 amplification.Pass through So, amplifying circuit 41 generates amplification detection signal S3 and exports, wherein, amplification detection signal S3 is shaking for inversion signal composition The width signal consistent with the amplitude of the in-phase signal composition of reference signal Sr1 for being transfused to add circuit 42, and there is Figure 21 institutes The frequency characteristic shown.In this case, the amplitude of the amplification detection signal S3 in frequency band W3, becomes exchange as shown in same figure K times of voltage V1, and become as shown in Figure 19 with frequency band W1 in reference signal Sr1 the amplitude (k of alternating voltage V1 Consistent state again).

Therefore, as shown in figure 22, add circuit 42, by the frequency characteristic shown in above-mentioned Figure 19 (with dot-dash in Figure 20 Characteristic represented by line) reference signal Sr1 (by relative to voltage signal S4 for homophase the signal that constitutes of signal component) in, The amplification detection signal S3 of the frequency characteristic (with the characteristic represented by thin solid line in Figure 22) added shown in above-mentioned Figure 21 is (by phase For voltage signal S4 is anti-phase signal component and the signal relative to the signal component composition that alternating voltage V1 is homophase), Generate only by constituting for the signal component of homophase relative to alternating voltage V1, and in the wide frequency with W3 from low-frequency band W1 tremendously high frequency In the range of band, output signal So of flat frequency characteristic (with the characteristic represented by thick solid line in Figure 22) (is shaken in broadband Width becomes the signal of k times of the amplitude of alternating voltage V1) and export.In this case, amplification detection signal S3 and reference signal Sr1 Comprising relevant contrast signal Ss each signal component, as shown in dotted line thick in Figure 22, due to consistent in mutual amplitude State, therefore be cancelled.

Next, processing unit 33B performs storage processing, numerical data D1 is transformed to while output signal So is input into And it is stored in storage part 34.Then, processing unit 33B performs voltage and calculates process.Calculate in process in the voltage, processing unit 33B While reading is stored in numerical data D1 of storage part 34, reference voltage calculates the numeral for being obtained and being read with chart TB The corresponding alternating voltage V1 of data D1.In addition, processing unit 33B calculates such as alternating current according to the alternating voltage V1 of the acquirement Virtual value or amplitude of pressure V1 etc. are simultaneously stored in storage part 34.In addition, processing unit 33B is also performed in voltage check device 1B Alternating voltage V1 detection action diagnostic process, and whether normally the judged result of voltage check device 1B actions is deposited It is stored in storage part 34.Finally, processing unit 33B performs output and processes, the virtual value of the alternating voltage V1 for making to be stored in storage part 34 Or amplitude and the judged result in diagnostic process etc. are shown in output section 35.By so, using voltage check device 1B's The detection of the alternating voltage V1 of detection object 4 terminates.

Therefore, in the embodiment, as processing unit 33B also performs judgement process, therefore, operator can be according to this Judge the result for processing and carry out the detection action of voltage in voltage check device 107 whether the diagnosis for normally carrying out (is sentenced It is disconnected), wherein, it is to detect the signal component Ss2 of relevant contrast signal Ss that Insulation monitoring signal S2 is included that judgement is processed Level Va while, be compared with specified level Vre, and judge that the action of voltage check device 107 is normal or different Normal process.As a result, using if the embodiment, the alternating voltage V1 detected due to distinguish can operator is Voltage during voltage or remarkable action when action is normal, therefore, it is possible to improve for the alternating voltage V1 for detecting can By property.

In addition, using if the embodiment, due to can be according to the amplification detection signal generated in signal extraction portion 32 S3, and detect that only by using the detection action of feedback control section 37 be the alternating voltage V1 of the high frequency band that cannot be detected, Therefore, it is possible to alternating voltage V1 is non-contactly detected in wide frequency band range.In addition, in the embodiment, due to energy It is enough to examine as the signal that affected by the coupled capacitor between detection object 4 and detecting electrode 12 (electrostatic capacitance C0) Output signal So is measured, therefore, also non-contactly can detect alternating voltage V1 without carrying out calculating for electrostatic capacitance C0.

In addition, in the voltage check device 107 that the embodiment is related to, naturally it is also possible to constituted using following, i.e.,：With Similarly, as shown in phantom in Figure 17, processing unit 33B is substituted in A to the voltage check device 105 that above-mentioned 5th embodiment is related to The level Va of the signal component Ss2 of the relevant contrast signal Ss included by the Insulation monitoring signal S2 that point is detected, and using in B Put the level Va of the signal component of the relevant contrast signal Ss included by the amplification detection signal S3 for detecting, detect in C points The level Va of the signal component of relevant contrast signal Ss that included of output signal So or the relevant inspection detected in D points The level Va of ripple signal Vd, and the composition of diagnostic process is performed, voltage detecting dress can be carried out according to any one level Va Put the diagnosis (judgement) whether the detection action of voltage in 1B is normally carried out.

In addition, in the 5th and the 6th voltage check device 105,106 that is related to of each embodiment, employ by will Detecting electrode 12, power supply unit 13, test section 14 and insulation division 15 are contained in shield electrode 11, and with main body circuit portion 3,3A Consubstantiality ground does not constitute floating circuit portion 2, so as to while CMRR (Common Mode Rejection Ratio) is improved, energy Enough enter the composition of the detection of the alternating voltage V1 of horizontal high voltage, but, it is operated with quick condition test section 14 need not be made When (for example, alternating voltage V1 is compared with low pressure or when being not required to high CMRR), it is also possible to replace test section 14 and adopt Fig. 5 Shown test section 14A (not using the test section of shield electrode 11, power supply unit 13 and insulation division 15).

In addition, in the voltage check device 105,106 using test section 14A, as processing unit 33B is also performed at judgement Reason, therefore, the detection that operator can carry out voltage in voltage check device 105,106 according to the result of judgement process is moved The diagnosis (judgement) that whether normally carries out of work, wherein, judgement is processed to be replaced Insulation monitoring signal S2 and is input into detecting Level Va (the amplitude electricity of signal component Ss2 of the signal component Ss2 of relevant contrast signal Ss that included of detection signal S1 It is flat) while, it is compared with specified level Vre, and judges that the action of voltage check device 105,106 is normal or abnormal Process.Therefore, because the voltage check device 105,106 by employing test section 14A, it is also possible to distinguish operator Voltage when the alternating voltage V1 for detecting is the voltage or remarkable action when action is normal, therefore, it is possible to improve for inspection The reliability of the alternating voltage V1 for measuring.

In addition, in the voltage check device 1 for employing test section 14A, naturally it is also possible to constituted using following, i.e.,： In the same manner as the situation of the voltage check device 1 of above-mentioned employing test section 14, as shown in phantom in Figure 15, processing unit 33B replaces (replace the Insulation monitoring signal S2 from the output of insulation division 15 in same figure, and from Fig. 5's in detection signal S1 that A points are detected The detection signal of test section 14A outputs) the level Va of the signal component Ss2 of relevant contrast signal Ss that included, and using in B Put the level Va of the signal component of the relevant contrast signal Ss included by the amplification detection signal S3 for detecting or examine in C points The level Va of the signal component of the relevant contrast signal Ss included by output signal So measured or in having that D points are detected The level Va of rectified signal Vd is closed, and performs the composition of diagnostic process, voltage inspection can be carried out according to any one level Va Survey the diagnosis (judgement) whether the detection action of voltage in device 1 is normally carried out.

In addition, in the voltage check device 106 for employing test section 14A, naturally it is also possible to using following composition, I.e.：In the same manner as the situation of the above-mentioned voltage check device 106 for employing test section 14, as shown in phantom in Figure 16, processing unit 33B be substituted in detection signal S1 that A points detect (replace the Insulation monitoring signal S2 from the output of insulation division 15 in same figure, and From the detection signal that the test section 14A of Fig. 5 is exported) the level Va of the signal component Ss2 of relevant contrast signal Ss that included, and The level Va of the signal component of the relevant contrast signal Ss included using the amplification detection signal S3 detected in B points or The level Va of the relevant rectified signal Vd detected in D points, and the composition of diagnostic process is performed, according to any one level Va all The diagnosis (judgement) whether the detection action of voltage in voltage check device 106 is normally carried out can be carried out.

Claims

1. a kind of voltage check device, the detection object alternating voltage produced in its detection detection object,

The voltage check device is characterised by,

The voltage check device is provided with：Detecting electrode, contrast signal output section, test section and signal extraction portion；

The detecting electrode is relative with the detection object and is equipped and carries out Capacitance Coupled with the detection object；

The contrast signal output section exports contrast signal；

The test section is connected to the detecting electrode, also, is input into the contrast signal will be according to detection object electric current With with reference to electric current two current values and amplitude variations detection signal output, wherein, the detection object electric current is according to described Detection object alternating voltage and the electric current that circulates, described is the electric current circulated according to the contrast signal with reference to electric current；

The signal extraction portion, the amplitude of the signal component of the contrast signal included with the detection signal become regulation Value is such, and controls gain and amplify the detection signal, extracts the inspection in the amplification detection signal obtained from its result The signal component of object exchange voltage is surveyed, and is exported as output signal；

The signal extraction portion has：Prespecified fixed value is become with the setting and controls the control of the gain like that Circuit processed and the filtering that the signal component of the detection object alternating voltage from the amplification detection signal is extracted and exported Device；

The voltage check device is also equipped with right to the detection according to the signal component extracted by the wave filter As the processing unit detected by alternating voltage.

2. a kind of line voltage distribution detection means, it is characterised in that

The line voltage distribution detection means is provided with：Detection is used as the alternating voltage for being produced in multiple circuits of detection object respectively Multiple voltage check devices, and

The differential voltage of the alternating voltage detected by the plurality of voltage check device is calculated, it is the plurality of so as to obtain The calculating section of the line voltage distribution between circuit；

Used as the plurality of voltage check device, difference usage right requires the voltage check device described in 1.