CN203596967U - Novel fluorescent lamp service life end protection circuit - Google Patents
Novel fluorescent lamp service life end protection circuit Download PDFInfo
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- CN203596967U CN203596967U CN201320698032.4U CN201320698032U CN203596967U CN 203596967 U CN203596967 U CN 203596967U CN 201320698032 U CN201320698032 U CN 201320698032U CN 203596967 U CN203596967 U CN 203596967U
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- 239000003990 capacitor Substances 0.000 claims description 47
- 230000000052 comparative effect Effects 0.000 claims description 19
- 230000001681 protective effect Effects 0.000 claims description 17
- 238000005070 sampling Methods 0.000 abstract 3
- 230000000087 stabilizing effect Effects 0.000 description 8
- 238000001914 filtration Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 101001074567 Chamaecyparis formosensis Alpha pinene synthase, chloroplastic Proteins 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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Abstract
The utility model discloses a fluorescent lamp service life end protection circuit. A delay unlocking and locking circuit is added at a protection signal output end of an existing lamp tube service life end protection sampling circuit, namely, during a delay time after a power supply is started, a locking inverter drive circuit does not work, after the delay time, an unlocking inverter drive circuit works. In the delay unlocking and locking circuit, an output of a voltage comparator is connected with a switch triode, and an output of a collector of the switch triode is connected with an output wire of a voltage sampling circuit. During the time, of a ballast starting up, longer than the time of the lamp tube preheating starting up, a protection signal locking switch tube is in a saturation breakover state, the output end of lamp tube service life end protection sampling circuit is locked, and that the ballast cannot start the lamp tube normally because of protection by mistake caused by interference generated from starting moment or multiple turn-on and turn-off of a power switch is avoided effectively. The lamp tube service life end protection circuit is reliable, economical, simple and practical.
Description
Technical field
The utility model relates to a kind of fluorescent lamp electric ballast, particularly a kind of lamp tube life end protective circuit of abnormal condition of lamp tube state.
Background technology
Fig. 1 is the basic composition block diagram of the electronic ballast for fluoresent lamp of Alternating Current Power Supply.The phase line L of AC supply voltage Vac after mains switch K1 together with center line N, for electric ballast 1 provides the supply of AC power.Alternating supply voltage Vac disturbs the high-frequency electromagnetic of power supply grid to suppress ballast through electromagnetic interference suppression circuit 10, alternating voltage is transformed into direct voltage by rectifier 20, power factor correction circuit 30 is for reducing the harmonic distortion of input current, in inverter 40, convert direct voltage to high-frequency ac voltage, light fluorescent lamp 2 and stable high-frequency work electric current is provided.Inverter 40 by inverter driving circuit 60 for each stage of fluorescent lamp operation provide corresponding frequencies inverter switching device pipe drive signal.In the time that appearring in lamp load, various abnormality protect ballast self be not damaged or do not cause security incident in order to ensure ballast; need to have abnormal condition protection to detect sample circuit 50 takes out and controls voltage from the suitable position of inverter; apply enable signal to inverter driving circuit; occur that at ballast lamp load open circuit (does not connect fluorescent tube; or pin loose contact, or filament disconnects), inverter driving circuit is quit work when the situation such as abnormal such as short circuit, lamp do not activate, lamp is died of old age.
The protection of dying of old age of fluorescent tube puts forward for the purpose of safety.In the time of lamp tube life end, asymmetric due to the electron emissivity of lamp tube ends filament, the asymmetry of the electric current that flows through fluorescent tube on both direction is known as rectifying effect.In the time there is rectifying effect in fluorescent tube, the temperature of one end of fluorescent tube has very high rising, particularly for T5 and the fluorescent tube of slim pipe diameter more, surface radiating condition variation during due to extra heavy pipe footpath relatively, the high temperature that fluorescent tube produces while there is serious rectifying effect even may make the glass bulb of one end of fluorescent tube melt and cause the potential safety hazard that fluorescent tube falls.During according to lamp tube life end, show as the characteristic such as the asymmetric of lamp current and the rising of lamp tube ends voltage, lamp tube life end protective circuit occurs with independent form conventionally outside other abnormity protection circuits.
Fig. 2 is a kind of existing lamp tube life end protective circuit.The asymmetrical voltage that fluorescent tube Lamp two ends occur at lamp tube life end is through resistance R 001 and capacitor C 002 dividing potential drop, be added to by rectifier diode D004 and filter capacitor C003, the negative half period current rectifying and wave filtering circuit that resistance R 004 forms and by rectifier diode D003 and filter capacitor C001, the positive half cycle current rectifying and wave filtering circuit that resistance R 003 forms.In the time that the difference of the commutating voltage on two rectification circuits exceedes the voltage stabilizing value of voltage stabilizing didoe D002, transistor Q001 conducting, a positive enable voltage is added to the Enable Pin EN of inverter driving circuit by diode D001, inverter driving circuit is stopped to inverter output drive signal, before lamp tube life end reaches degree of danger, ballast quits work, and avoids lamp tube life end and the security incident that causes.Lamp tube life end degree is set by the voltage stabilizing value of voltage stabilizing didoe.
In this lamp tube life end protection sample circuit; the subject matter of its existence is to have start to disturb; when ballast when start or continuous several times switch; on two rectifying and wave-filtering electric capacity, there will be interference voltage; cause drive circuit works undesired; generally solution is, filter capacitor C001 and C003 are adopted to jumbo electrochemical capacitor, avoids forming start interference to obtain the long time constant that discharges and recharges.Adopt jumbo electrochemical capacitor can cause again ballast volume large, cost is high.
Summary of the invention
For solving aforementioned problem of depositing, the utility model provides a kind of novel fluorescent lamp end of Lamp life protective circuit, be provided with protection voltage sample circuit in lamp tube ends, the output line of protection voltage sample circuit, be connected with the Enable Pin of inverter driving circuit, in the time of lamp tube life end when the asymmetric lamp tube life end state that reaches setting of lamp tube ends voltage, the positive output output of protection voltage sample circuit, the Enable Pin of control inverter drive circuit quits work inverter; On the protection output of voltage sample circuit and the line of inverter driving circuit Enable Pin; arrange and postpone solution, exclusive circuit; in the time of delay of setting after startup power supply; the impact of the not protected sample circuit output of the work of locking inverter driving circuit; after time of delay; unlocking, makes the work of inverter driving circuit, recovers the control of self-shield voltage sample circuit output.
Described delay solution, exclusive circuit, be the output of a voltage comparator, connects a switch triode, and the output of switch triode collector electrode, is connected with voltage sample circuit output line.
An input of described voltage comparator, contact resistance voltage divider, as reference voltage, the other end is connected with resistance, capacitor charging circuit, voltage as a comparison, select the value of resistance and electric capacity, determine time of delay, in the time that comparative voltage is less than reference voltage, triode saturation conduction, its collector electrode clamper is being not more than 0.7V, the impact of the not protected sample circuit output of work of locking lock inverter driving circuit; In the time that comparative voltage is greater than reference voltage, triode cut-off, unlocking, the work of inverter driving circuit recovers to be connected on the control of self-shield voltage sample circuit output in its Enable Pin.
Described comparative voltage, or take from the voltage in the filament preheating time timing capacitor that Driven by inverter integrated circuit has, now select again a resistance, determine comparative voltage.
Described voltage comparator can be voltage comparator independently, can be also the built-in operational amplifier with the Driven by inverter integrated circuit of built-in operational amplifier.
Described switch triode collector electrode output, after being connected, then is connected with the Enable Pin of inverter driving circuit by booster diode with protection voltage sample circuit output line.
Advantage one of the present utility model is; on the guard signal output of existing lamp tube life end protection sample circuit; increase a set of by reference voltage bleeder circuit; comparative voltage circuit; voltage comparator circuit, the guard signal that guard signal latch switch pipe and enable voltage promote the compositions such as diode postpones open and close lock circuit.Ballast starting up's a segment length within the time of tube filament preheating, guard signal latch switch pipe saturation conduction, now, even if having from the lamp tube life end signal of lamp tube life end protection sample circuit is high level enable signal, do not have higher than the enable voltage of inverter driving circuit and be applied to inverter driving circuit, prevent that inverter driving circuit from changing to inverter output drive signal rapidly, thereby the issuable interference voltage of lamp tube life end protective circuit that can effectively prevent booting moment or quick repeatedly power on/off source switch and cause causes error protection action.Filter capacitor in lamp tube life end protection sample circuit is also substituted with common low capacity patch capacitor without adopting jumbo electrochemical capacitor again.Like this, in improving significantly the reliability of protective circuit action, in lamp tube life end protection sample circuit, adopt low capacity electric capacity, not only reduced cost, the typesetting of the printed circuit board of being more convenient for.
The 2nd, the comparative voltage postponing in unlock circuit when guard signal utilizes the voltage forming in timing capacitor the warm-up time of Driven by inverter integrated circuit; and in the time that some Driven by inverter integrated circuit has built-in operational amplifier to be used as voltage comparator, guard signal delay unlock circuit only needs to add several resistance and a triple-pole switch transistor can be realized.Thereby this lamp tube life end protective circuit has reliably, economy, the advantage such as simple and practical.
Accompanying drawing explanation
Fig. 1 is general electric ballast block diagram;
Fig. 2 is existing lamp tube life end protective circuit;
Fig. 3 is existing Driven by inverter integrated circuit timing capacitor warm-up time voltage oscillogram;
Fig. 4 is fluorescent lamp end of Lamp life protective circuit of the present utility model;
Fig. 5 is the lamp tube life end protective circuit that the utility model utilizes inverter integrated circuit timing capacitor warm-up time and built-in operational amplifier.
Number in the figure explanation
Embodiment
Refer to shown in accompanying drawing 4 and accompanying drawing 5, the invention will be further described.
Be provided with voltage sample circuit at fluorescent tube LAMP two ends: positive and negative ripple rectification circuit, voltage sample circuit output line, is connected with inverter driving circuit EN end by diode D001, when lamp tube ends electric voltage exception, voltage sample circuit output, control inverter drive circuit quits work; In voltage sample circuit output, on inverter driving circuit line, arrange and postpone solution, exclusive circuit, in the time of delay of setting after startup power supply, locking inverter driving circuit is not worked, after time of delay, the work of release inverter driving circuit.
Described delay solution, exclusive circuit, be the output of a voltage comparator OP, connects a switch triode Q101, and the output of switch triode Q101 collector electrode, is connected with voltage sample circuit output line B point.
An input of described voltage comparator OP, contact resistance R101, R102 voltage divider, as reference voltage, the other end is connected with resistance R V, capacitor C V charging circuit, voltage as a comparison, select RV, CV value, determine time of delay, in the time that comparative voltage is less than reference voltage, triode Q101 saturation conduction, its collector electrode clamper, at 0.7V, is pinned inverter driving circuit and is not worked; In the time that comparative voltage is greater than reference voltage, triode cut-off, the work of release inverter driving circuit.
Described comparative voltage, or take from the voltage on the filament preheating time timing capacitor CV that Driven by inverter integrated circuit has, now select again a resistance R 106, determine comparative voltage.
Described switch triode collector electrode output, after being connected, then is connected with inverter driving circuit by booster diode D101 with voltage sample circuit output line.
Before ballast start fluorescent tube starts; the Enable Pin of locking inverter driving circuit; effectively avoid because of booting moment or the interference that fast repeatedly power on/off source switch produces causes that the ballast that mistake protection causes cannot normally start lamp works; even if protect large capacity electrolysis filter capacitor in sample circuit to replace to the common electric capacity of low capacity lamp tube life end, also can not cause the mistake protection of lamp tube life end protection.
The present invention postpones unlock circuit two parts by lamp tube life end protection sample circuit and guard signal and forms.Described guard signal postpones unlock circuit by reference voltage bleeder circuit, comparative voltage circuit, and voltage comparator circuit, guard signal latch switch pipe and enable voltage promote the compositions such as diode.
One termination+Vcc low-voltage dc voltage of the divider resistance R101 of described reference voltage bleeder circuit, one section of the other end of divider resistance R101 and divider resistance R102 is connected to A point, the other end ground connection of divider resistance R102.The branch pressure voltage that A is ordered is reference voltage, receives the positive input terminal OPin+ of voltage comparator OP.The voltage ratio of voltage divider is chosen and made the magnitude of voltage of reference voltage is be greater than+3.5 V, is less than+5 V.
Described comparative voltage circuit is made up of the timing resistor Rv between be connected on+Vcc low-voltage dc voltage and ground and timing capacitor Cv, the common port of timing resistor Rv and timing capacitor Cv produces after a start the linear voltage increasing in time at C point, receives the negative input end OPin-of voltage comparator OP.In the time that employing is connected on the voltage Vcv forming on timing capacitor Cv warm-up time of the other end ground connection on the filament preheating time timing capacitor pin CF of Driven by inverter integrated circuit (IC) and makes comparisons voltage, C point through the CF pin of resistance R 105 and Driven by inverter integrated circuit and warm-up time timing capacitor Cv one end be connected and obtain comparative voltage.Voltage Vcv on timing capacitor Cv is from be elevated to+3.5 V of 0 V linearity, and after finishing warm-up time, frequency sweep starts, and the frequency sweep time was about in 1/10th times of warm-up time, and now Vcv voltage is rapidly since 0 rise to+5 V.
The output OPout of voltage comparator OP receives the base stage of latch switch transistor Q101 through base resistance R104.Between the output OPout of voltage comparator OP and negative input end OPin-, be connected feedback resistance R103.
The grounded emitter of latch switch transistor Q101, collector electrode B point is received the Enable Pin EN of inverter driving circuit through voltage lifting diode D101, and the positive pole of diode D101 connects B point, and negative pole meets the Enable Pin EN of inverter driving circuit.
The a period of time that can arrange after start is as within the time of fluorescent tube pipeline start up by preheating; the voltage of voltage comparator OP positive input terminal OPin+ is higher than the voltage of negative input end OPin-; voltage comparator OP output OPout positive voltage; latch switch transistor Q101 saturation conduction, described guard signal postpones unlock circuit in blocking.This is that the voltage that latch switch transistor Q101 collector electrode B is ordered is locked on the saturation pressure depreciation that is less than 0.7V of latch switch transistor Q101 due to when the latch switch transistor Q101 saturation conduction.This voltage is after voltage promotes diode D101, and the voltage on the Enable Pin EN of inverter driving circuit must be lower than the threshold value 0.7V of Enable Pin EN.Like this; in the time of one section of setting after starting; for example, within 1 seconds of filament pre-heating; no matter whether lamp tube life end protection sample circuit has output; latch switch transistor Q101 in saturation conduction state protects the output B point of sample circuit to be locked in lamp tube life end and can not make inverter driving circuit enable and maintain it to inverter output drive signal, complete uninterruptedly the startup of ballast to fluorescent tube.
The a period of time that can arrange after start is as after the time of fluorescent tube pipeline start up by preheating, be connected on C point voltage on voltage comparator OP negative input end OPin-exceed be set in+3.5V between+5V be added in the reference voltage that the A on voltage comparator OP positive input terminal OPin+ orders after, voltage comparator OP output OPout upset is negative voltage, latch switch transistor Q101 cut-off, latch switch transistor Q101 collector electrode B point is the output Lock effect to lamp tube life end protection sample circuit no longer, the Enable Pin EN of inverter driving circuit detects that at lamp tube life end protection sample circuit the height output while dying of old age guard signal is able to stop inverter driving circuit to inverter output drive signal.
For be built-in with the Driven by inverter integrated circuit as the operational amplifier of brightness adjustment control as L6574 etc.; in the time not using its dimming function, also can utilize its built-in operational amplifier as the voltage comparator in described guard signal delay unlock circuit and without annexation being done to any change.
In described lamp tube life end protection sample circuit, the divider resistance R001 and the dividing potential drop capacitor C 002 that are connected on fluorescent tube Lamp two ends are carried out dividing potential drop to the voltage of lamp tube ends.One end of divider resistance R001 and the two ends of connecting tube Lamp respectively, dividing potential drop capacitor C 002 one end, the other end of divider resistance R001 and dividing potential drop capacitor C 002 is connected together.The common port of divider resistance R001 and dividing potential drop capacitor C 002 is also connected with the positive pole of rectifier diode D003 of positive half cycle and the negative pole of the rectifier diode D004 of negative half period.The negative pole of rectifier diode D003 and filter capacitor C001, each one end of filter resistance R003 links together; The positive pole of rectifier diode D004 and filter capacitor C003, each one end of filter resistance R004 links together, and again with the base stage of transistor Q001 and a termination of resistance R 002.The emitter of transistor Q001, the positive pole of the other end of resistance R 002 and voltage stabilizing didoe D002 links together.The negative pole of the negative pole of voltage stabilizing didoe D002 and rectifier diode D003, the common port of filter capacitor C001 and filter resistance R003 is connected.Filter capacitor C001 and filter resistance R003, each other end of filter capacitor C003 and filter resistance R004 is connected to the common point of dividing potential drop capacitor C 002 and fluorescent tube Lamp one end.The collector electrode of transistor Q001 connects the positive pole of diode D001, is exported lamp tube life end guard signal by the negative pole of diode D001 when the lamp tube life end.The negative pole of diode D001 is that the locking point B that described guard signal postpones unlock circuit is received in the output of described lamp tube life end protection sample circuit.
When fluorescent tube Lamp dies of old age temporarily, more and more asymmetric lamp current makes the voltage at lamp two ends also present the asymmetry of positive-negative half-cycle.In the time that dying of old age of this lamp that is called rectifying effect arrives certain order of severity, after the difference of the rectifying and wave-filtering voltage of the asymmetric modulating voltage of getting at dividing potential drop capacitor C 002 two ends in positive half cycle rectifying and wave-filtering capacitor C 001 and resistance R 003 and the rectifying and wave-filtering voltage in negative half period rectifying and wave-filtering capacitor C 003 and resistance R 004 is greater than the voltage stabilizing value of voltage stabilizing didoe D002, transistor Q001 saturation conduction, described lamp tube life end protection sample circuit is exported positive lamp tube life end guard signal through diode D001, after the warm-up time of start, the high level enable signal being added on Enable Pin EN stops inverter driving circuit to inverter output drive signal, the fluorescent tube of dying of old age will no longer be lighted, the potential safety hazard that the fluorescent tube continuous firing of avoiding dying of old age may cause.Within the pipeline start up by preheating time in approximately 1 second after start; no matter whether described lamp tube life end protection sample circuit has the positive Voltage-output including the start interference signal that may exist; always saturation conduction of latch switch pipe Q101; the locking point B that described guard signal postpones unlock circuit is locked in the threshold value that enables level lower than the inverter driving circuit of 0.7V; inverter driving circuit maintains normal output, to guarantee that the non-fluorescent tube energy normal ignition of dying of old age is used.
In the situation that not thering is guard signal delay unlock circuit of the present invention; for prevent lamp tube life end protection sample circuit booting moment or fast repeatedly when power on/off source switch output start interference signal cause mistake protection; filter capacitor C001 and C003 in lamp tube life end protection sample circuit must adopt jumbo electrochemical capacitor, eliminate issuable interference with large charge constant.Big capacity electrolyte capacitor not only cost is high, the typesetting while being also unfavorable for the size for reducing printed circuit board.In the situation that adopting guard signal of the present invention to postpone unlock circuit, filter capacitor C001 and C003 in described lamp tube life end protection sample circuit just can select low capacity electric capacity and needn't worry the impact of start interference on inverter driving circuit output.
Described guard signal postpones the comparative voltage circuit in unlock circuit, produces a voltage for increase in time at C point, and it is connected on the negative input end of voltage comparator.Be connected on voltage comparator positive input terminal is A point by divider resistance R101 and R102 from+fixing reference voltage that Vcc direct voltage dividing potential drop obtains.Before C point voltage is not yet elevated to the reference voltage value that A orders, the positive input terminal voltage of voltage comparator OP is the negative input voltage that reference voltage is greater than voltage comparator OP, voltage comparator OP exports positive voltage, be added to the base stage of latch switch transistor Q101 through base resistance R104, make latch switch transistor Q101 saturation conduction, the voltage that latch switch transistor Q101 collector electrode B is ordered is locked in the saturation pressure depreciation that is less than 0.7V of latch switch transistor Q101.The threshold value of the Enable Pin EN of inverter driving circuit is 0.7V, when only the voltage on Enable Pin EN is lower than 0.7V, inverter driving circuit is to the normal output drive signal of inverter, in the time being added in voltage on Enable Pin EN higher than 0.7V, inverter driving circuit will stop to inverter output drive signal.Between B point and the Enable Pin EN of inverter driving circuit, be connected to voltage and promote diode D101, even take guarantee blocking voltage that B orders at the saturation voltage drop of latch switch transistor Q101 as maximum 0.7V,, while approaching the threshold value of Enable Pin EN, also can keep inverter driving circuit to the normal output drive signal of inverter.During this period; the i.e. time of one section of setting after starting; for example, within 1 seconds that filament pre-heating, fluorescent tube start; no matter whether lamp tube life end protection sample circuit has the output of high level guard signal, and the Enable Pin EN that can not make inverter driving circuit enables and keeps normal work.Based on this, just can worry that in lamp tube life end protection sample circuit replacing jumbo electrochemical capacitor with low capacity electric capacity does the meeting that filter capacitor may bring and produce the suffering that start is disturbed.
After C point voltage is elevated to the reference voltage value that A orders; comparative voltage on voltage comparator OP negative input end C point is higher than the reference voltage on voltage comparator OP positive input terminal B point; the output of voltage comparator OP is negative voltage by positive voltage upset; latch switch transistor Q101 cut-off; remove the locking to the output of lamp tube life end protection sample circuit, the Enable Pin EN of inverter driving circuit is subject to the control of lamp tube life end protection sample circuit output.In normal work period; when lamp tube life end protection sample circuit obtains normal lamp tube life end guard signal; the high level signal of output is added to the Enable Pin EN of inverter driving circuit; inverter driving circuit is stopped to inverter output drive signal; inverter quits work, and ballast can not be lighted and be judged as the fluorescent tube of dying of old age.
Driven by inverter integrated circuit has the leading foot Cv of a filament preheating time timing capacitor.Fig. 3 is the oscillogram of Driven by inverter integrated circuit timing capacitor warm-up time voltage Vcv.In the filament preheating time in about 1 second that can arrange after start, voltage Vcv on timing capacitor Cv is from be elevated to+3.5 V of 0 V linearity, after finishing warm-up time, frequency sweep starts to be down to rapidly spark rate by pre-heat frequency, Vcv voltage is since 0 rise to+5 V, and this frequency sweep period is approximately 1/10th of warm-up time.As long as die of old age guard signal postpone A is ordered in unlock circuit be set in+3.5 V of reference voltage and+5 V between; just can guarantee that, before finishing during filament pre-heating, described guard signal postpones the blocking of unlock circuit in latch switch transistor Q101 saturation conduction.
For the Driven by inverter integrated circuit that is built-in with operational amplifier as L6574 etc., in the time not using its dimming function, also can utilize its built-in operational amplifier to postpone the voltage comparator in unlock circuit as described guard signal.
Claims (6)
1. a novel fluorescent lamp end of Lamp life protective circuit, be provided with protection voltage sample circuit in lamp tube ends, the output line of protection voltage sample circuit, be connected with the Enable Pin of inverter driving circuit, in the time of lamp tube life end when the asymmetric lamp tube life end state that reaches setting of lamp tube ends voltage, the positive output output of protection voltage sample circuit, the Enable Pin of control inverter drive circuit quits work inverter; It is characterized in that; on the protection output of voltage sample circuit and the line of inverter driving circuit Enable Pin; arrange and postpone solution, exclusive circuit; in the time of delay of setting after startup power supply; the impact of the not protected sample circuit output of the work of locking inverter driving circuit, after time of delay, unlocking; make the work of inverter driving circuit, recover the control of self-shield voltage sample circuit output.
2. by a kind of novel fluorescent lamp end of Lamp life protective circuit claimed in claim 1, it is characterized in that described delay solution, exclusive circuit; the output of a voltage comparator; connect a switch triode, the output of switch triode collector electrode, is connected with voltage sample circuit output line.
3. by a kind of novel fluorescent lamp end of Lamp life protective circuit claimed in claim 2, it is characterized in that, an input of described voltage comparator, contact resistance voltage divider, as reference voltage, the other end is connected with resistance, capacitor charging circuit, voltage as a comparison, select the value of resistance and electric capacity, determine time of delay, in the time that comparative voltage is less than reference voltage, triode saturation conduction, its collector electrode clamper is being not more than 0.7V, the impact of the not protected sample circuit output of work of locking lock inverter driving circuit; In the time that comparative voltage is greater than reference voltage, triode cut-off, unlocking, the work of inverter driving circuit recovers to be connected on the control of self-shield voltage sample circuit output in its Enable Pin.
4. by a kind of novel fluorescent lamp end of Lamp life protective circuit claimed in claim 3; it is characterized in that, described comparative voltage, or take from the voltage in the filament preheating time timing capacitor that Driven by inverter integrated circuit has; now select again a resistance, determine comparative voltage.
5. by a kind of novel fluorescent lamp end of Lamp life protective circuit claimed in claim 2; it is characterized in that; described voltage comparator can be voltage comparator independently, can be also the built-in operational amplifier with the Driven by inverter integrated circuit of built-in operational amplifier.
6. by a kind of novel fluorescent lamp end of Lamp life protective circuit claimed in claim 2; it is characterized in that; described switch triode collector electrode output, after being connected, then is connected with the Enable Pin of inverter driving circuit by booster diode with protection voltage sample circuit output line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320698032.4U CN203596967U (en) | 2013-11-07 | 2013-11-07 | Novel fluorescent lamp service life end protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320698032.4U CN203596967U (en) | 2013-11-07 | 2013-11-07 | Novel fluorescent lamp service life end protection circuit |
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| CN203596967U true CN203596967U (en) | 2014-05-14 |
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| CN201320698032.4U Expired - Lifetime CN203596967U (en) | 2013-11-07 | 2013-11-07 | Novel fluorescent lamp service life end protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104144548A (en) * | 2014-08-19 | 2014-11-12 | 上海阿卡得电子有限公司 | Electric arc suppressing circuit for electronic ballast for fluorescent lamp |
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2013
- 2013-11-07 CN CN201320698032.4U patent/CN203596967U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104144548A (en) * | 2014-08-19 | 2014-11-12 | 上海阿卡得电子有限公司 | Electric arc suppressing circuit for electronic ballast for fluorescent lamp |
| CN104144548B (en) * | 2014-08-19 | 2016-09-07 | 上海阿卡得电子有限公司 | A kind of electronic ballast for fluoresent lamp arc suppressing circuit |
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