CN104979794A - Home appliance protection switch - Google Patents
Home appliance protection switch Download PDFInfo
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- CN104979794A CN104979794A CN201510413228.8A CN201510413228A CN104979794A CN 104979794 A CN104979794 A CN 104979794A CN 201510413228 A CN201510413228 A CN 201510413228A CN 104979794 A CN104979794 A CN 104979794A
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- detent
- locating shaft
- moving contact
- interlock plate
- protection switch
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Abstract
The invention discloses a home appliance protection switch, so as to solve the problem that a protection switch on the market can not protect a small home appliance with small rated current. According to the technical scheme, an over-current detection unit also comprises an adjusting unit, and the adjusting unit is used for adjusting magnitude of output voltage. According to the home appliance protection switch, as the adjusting unit is set, an operator can randomly adjust an over-current limit needed by a home appliance (a load), the switch can be applied to home appliances of various power, use convenience is improved, the home appliances of various power can be protected, small home appliances with smaller current can further be protected, the small home appliances can be prevented from being damaged in the case of overload, and thus the entire protection switch can be protected from being damaged; and short circuit protection is also provided, a fireproof role is played, and integrity of the entire protection switch can also be ensured.
Description
Technical field
The present invention relates to a kind of protective device, more particularly, it relates to a kind of household electrical appliance protection switch.
Background technology
Along with the development of science and technology; protector for household electrical appliances is gradually required for people; protector for household electrical appliances is that one has the multi-functional protectors such as overload protection, short-circuit protection, overvoltage protection, overtemperature protection; such as circuit breakers etc., can provide the guarantee of reliability for protective device and property safety.
But current used various protectors are all without quick protective device function, when household electrical appliance transship for a certain reason, easy heating is on fire, because regular tap is without the function of auto power off, still fire can be caused after switch is burnt, and generally adopt the miniature circuit breaker of 10A-20A, such protector can not deenergization fast, do not have the effect of protective device, existing miniature circuit breaker is by bimetal leaf, electrified regulation, flexural deformation is to realize deenergization, need the rated current about logical upper twice, trip time at least also needs a few minutes simultaneously, and it is very large to be subject to ambient temperature effect, so tripping operation speed is slow, sensitivity is also poor.
In order to overcome above-mentioned shortcoming, existing disclosed Flameproof protection switch, it mainly comprises setting current sensor on circuit boards, zero-sequence transformer, test button, reset button, control circuit, magnetictrip, two static contacts and movable contact spring; It is characterized in that described two movable contact spring one end are arranged on circuit boards, centre arranges an insulating hanger, and the other end is respectively equipped with a moving contact; Reset button is set with back-moving spring, and bottom is provided with the reset be oppositely disposed with insulating hanger and links up with, and the hook that resets is connected with iron core; One end of two static contacts is respectively equipped with a fixed contact, and the other end is arranged on circuit boards; N pole is through zero-sequence transformer, and L pole is simultaneously through zero-sequence transformer and current sensor.Mechanical part of the present invention makes it to thread off to realize deenergization with insulating hanger by iron core direct pull reset hook, thus has that structure is simple, tripping force is large, quick action, highly sensitive, working stability reliable, long service life, low cost and other advantages.
By above-mentioned technical scheme, namely by arranging controllable silicon to realize occurring overvoltage, energy fast shut-off power supply during the situations such as overcurrent, substantially increase sensitivity, protection is realized more fast, but in protection process, still cannot protect some compact electric apparatus, and the rated current of general protection switch is all greater than 10A, the overcurrent of household small-size electrical equipment generally can not exceed the rated current of protection switch, therefore can not jump disconnected, so often burn out household electrical appliance, the phenomenon of initiation fire occurs, utilize protection switch on the market to carry out protection and can only protect the situation that overcurrent is larger, the protection rated current that is far from being is the small household appliance of below 1A.
Simultaneously for the mechanical structure in technique scheme, general protection switch all has reset button, magnetictrip, two static contacts and movable contact spring, the contact conducting of sound contact is realized by Push switch, once when there is the situation of overcurrent, then by magnetictrip, whole circuit is cut off, after maintenance completes, then by pressing reset button, magnetictrip is reset, can reuse to make protection switch, for the ease of pressing reset button, then usual outside reset button being arranged at protection switch, reset button is easily damaged, also affect the aesthetic property of whole protection switch simultaneously, and in order to arrange reset button on protection switch, then can arrange perforate on the housing of protection switch to place for reset button, thus make dust can enter into protection switch inside from perforate, dust accretions is between moving contact and fixed contact, protection switch loose contact fault all can be caused between electromagnetic core, also the radiating condition of protection switch inside can be made to be deteriorated simultaneously, the lost of life, the moisture meeting etching apparatus wiring board of dust itself and its absorption, between electric appliance circuits, long-pending full dust, can make to leak electricity between nuditing wire, also the short circuit of possibility detonator circuit, so ensure that the integrality of protection switch can effectively avoid entering of dust.
Summary of the invention
For the deficiency that prior art exists; the object of the present invention is to provide a kind of household electrical appliance protection switch; can small household appliance be protected, avoid situation small household appliance being damaged when transshipping to occur, also can ensure the integrality of whole protection switch simultaneously.
For achieving the above object, the invention provides following technical scheme: a kind of household electrical appliance protection switch, comprise magnetictrip with for controlling the control circuit that magnetictrip opens and closes, described control circuit comprises over-current detection unit and controllable silicon;
Described over-current detection unit is connected to live wire to detect overcurrent, and output voltage, if output voltage is less than the trigger voltage of SCR control pole, then magnetictrip does not work; If output voltage is greater than the trigger voltage of SCR control pole, then magnetictrip work disconnects to control live wire,
Described over-current detection unit also comprises regulon, and described regulon is in order to the size of regulation output voltage.
The present invention is set to further, and described over-current detection unit also comprises induction coil, and described induction coil is coupled to live wire to induce the induced voltage corresponding to output voltage, and described regulon is potentiometer, and described potentiometer is connected to induction coil two ends.
The present invention is set to further, also comprises the resetting device for being carried out resetting by magnetictrip, and described resetting device comprises detent group;
When the armature adhesive of magnetictrip, described detent group is to prop up armature and to disconnect live wire;
When magnetictrip needs to reset, press seesaw and move to drive detent group, described detent group unclamps armature, and armature is resetted with conducting live wire under the driving of back-moving spring.
The present invention is set to further, also comprises seesaw, interlock plate, fixed support, the first wiring pin and the second wiring pin;
Described first wiring pin is provided with the first fixed contact, and described second wiring pin is provided with the second fixed contact;
Described seesaw and interlock plate interlock, and drive interlock plate lengthwise movement;
Described fixed support is fixedly connected with interlock plate;
Described fixed support is provided with and the first fixed contact, the first moving contact that the second fixed contact is corresponding, and described first moving contact can contact with the first fixed contact or the second fixed contact;
The driving shaft of described magnetictrip is provided with the 3rd moving contact, described fixed support is also provided with second moving contact corresponding with the 3rd moving contact, and described second moving contact can contact with the 3rd moving contact.
The present invention is set to further, also comprises locating support, and described detent group comprises detent and lower detent;
Described locating support is provided with locating shaft and lower locating shaft, and described upper locating shaft and upper detent are near a side contacts of the second moving contact, and described lower locating shaft and lower detent are near a side contacts of the second moving contact;
Described upper detent is rotatably connected with interlock plate near the opposite side of upper locating shaft, and described lower detent is rotatably connected with interlock plate near the opposite side of lower locating shaft, described upper detent, lower detent all with interlock plate interlock;
The place of being rotatably connected of described upper detent, lower detent is equipped with elastic component, and described elastic component drives upper detent, lower detent contacts with upper locating shaft, lower locating shaft respectively.
The present invention is set to further, also comprises locating support, and described detent group comprises detent and lower detent;
Described interlock plate is provided with locating shaft and lower locating shaft, and described upper locating shaft and upper detent are near a side contacts of the second moving contact, and described lower locating shaft and lower detent are near a side contacts of the second moving contact;
Described upper detent is rotatably connected with interlock plate near the opposite side of upper locating shaft, and described lower detent is rotatably connected with interlock plate near the opposite side of lower locating shaft, described upper detent, lower detent all with interlock plate interlock;
The place of being rotatably connected of described upper detent, lower detent is equipped with elastic component, and described elastic component drives upper detent, lower detent contacts with upper locating shaft, lower locating shaft respectively.
Hinge structure of the present invention is compared to be had: by the setting of regulon; operating personnel can be made arbitrarily to regulate the boundary of the overcurrent required for the external world; to adapt to the household electrical appliance of various power; improve degree easy to use; realize the household electrical appliance can protecting different overcurrent value simultaneously; and then can small household appliance be protected, avoiding situation small household appliance being damaged when transshipping to occur, also can ensure the integrality of whole protection switch simultaneously.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is structural representation of the present invention;
Fig. 2 is explosive view one of the present invention;
Fig. 3 is the enlarged diagram in A portion in Fig. 2;
Fig. 4 is explosive view two of the present invention;
Fig. 5 is the structural representation of the embodiment of detent group of the present invention;
Fig. 6 is the enlarged diagram in B portion in Fig. 5;
Fig. 7 is the mechanical schematic diagram that detent group of the present invention is implemented;
Fig. 8 is the structural representation of the embodiment of detent group of the present invention;
Fig. 9 is the enlarged diagram in B ' portion in Fig. 8;
Figure 10 is the mechanical schematic diagram that detent group of the present invention is implemented;
Figure 11 is the circuit theory diagrams of the embodiment of control circuit of the present invention.
In figure: 1, control circuit; 11, rectification unit; 12, over-current detection unit; 121, regulon; 13, indicating member; 14, Overvoltage protecting unit; 2, seesaw; 21, sidewall; 22, roof; 3, interlock plate; 4, fixed support; 41, the first moving contact; 42 second moving contacts; 5, the first wiring pin; 51, the first fixed contact; 6, the second wiring pin; 61, the second fixed contact; 7, resetting device; 71, detent group; 711, upper detent; 712, lower detent; 713, inclined-plane; 72, locating support; 721, upper locating shaft; 722, lower locating shaft; 73, elastic component; 8, driving shaft; 81, the 3rd moving contact; 9, knob; YR, magnetictrip.
Hinge structure of the present invention is compared to be had: by the setting of regulon; operating personnel can be made arbitrarily to regulate the boundary of the overcurrent required for the external world; to adapt to the household electrical appliance of various power; improve degree easy to use; realize the household electrical appliance can protecting different overcurrent value simultaneously; and then can small household appliance be protected; situation small household appliance being damaged when transshipping is avoided to occur; also can ensure the integrality of whole protection switch simultaneously, not need to offer non-essential through hole etc.Magnetictrip.
Embodiment
Shown in Figure 11, embodiment is described further.
A kind of household electrical appliance protection switch disclosed by the invention; comprise seesaw 2, interlock plate 3, fixed support 4, first wiring pin 5 and the second wiring pin 6; first wiring pin 5 is provided with the first fixed contact 51; second wiring pin 6 is provided with the second fixed contact 61; first wiring pin 5 is connected to different electrical equipment from the second wiring pin 6, makes a protection switch can realize the keying of control two electrical equipment.
Seesaw 2 and interlock plate 3 interlock, and drive interlock plate 3 lengthwise movement, seesaw 2 is provided with installation shaft, interlock plate 3 is provided with the installing hole worn for installation shaft, by pressing seesaw 2, installation shaft is made to drive interlock plate 3 interlock, that presses due to seesaw 2 floats not quite simultaneously, so the movement locus of interlock plate 3 can be similar to regard lengthwise movement as, fixed support 4 is fixedly connected with interlock plate 3, it should be noted that herein, together with fixed support 4 can be relatively fixed by bolt with interlock plate 3, or can by riveted joint, the ways customary such as clamping reach the object be fixedly connected with, above-mentioned connected mode, it is all technological means well-known to those skilled in the art, be not described further herein, fixed support 4 is provided with and the first fixed contact 51, first moving contact 41 of the second fixed contact 61 correspondence, first moving contact 41 can contact with the first fixed contact 51 or the second fixed contact 61, the driving shaft 8 of magnetictrip YR is provided with the 3rd moving contact 81, fixed support 4 is also provided with second moving contact 42 corresponding with the 3rd moving contact 81, second moving contact 42 can contact with the 3rd moving contact 81, protection switch also comprises base plate simultaneously, base plate is provided with the installing hole worn for fixed support 4, fixed support 4 can lengthwise movement on base plate, be limited in installing hole by fixed support 4, fixed support 4 is defined with the position of interlock plate 3, the situation that can not come off occurs, improve the stability of structure.
Press the rear side of seesaw 2, interlock plate 3 is driven longitudinally to move upward to make installation shaft, and then fixed support 4 is also driven longitudinal on base plate moving upward, the first moving contact 41 on fixed support 4 is contacted with the first fixed contact 51, and then the electrical equipment be connected with the first wiring pin 5 is connected; Press the front side of seesaw 2, installation shaft is made to drive interlock plate 3 longitudinally to move downward, and then fixed support 4 is also driven longitudinal on base plate moving downward, the first moving contact 41 on fixed support 4 is contacted with the second fixed contact 61, and then the electrical equipment be connected with the second wiring pin 6 is connected.
Protection switch also comprises the resetting device 7 for being carried out resetting by magnetictrip YR, resetting device 7 comprises detent group 71, when the armature adhesive of magnetictrip YR, detent group 71 is to prop up armature and to disconnect live wire, drive driving shaft 8 with the 3rd moving contact 81 transverse shifting and the 3rd moving contact 81 is separated with the second moving contact 42 time, the 3rd moving contact 81 props up the 3rd moving contact 81 is not contacted with the second moving contact 42 by detent group 71; When magnetictrip YR needs to reset, press seesaw 2 to move to drive detent group 71, armature is resetted with conducting live wire under the driving of back-moving spring, namely the 3rd moving contact 81 is made no longer to be propped up, driving shaft 8 and the 3rd moving contact 81 reset under the driving of back-moving spring, and the 3rd moving contact 81 is contacted with the second moving contact 42.
The theory of mechanics of detent group 71 is as follows:
As Fig. 5, 6, shown in 7, in one embodiment, protection switch also comprises locating support 72, detent group 71 comprises detent 711 and lower detent 712, locating support 72 is provided with locating shaft 721 and lower locating shaft 722, upper locating shaft 721 and the side contacts of upper detent 711 near the second moving contact 42, lower locating shaft 722 and the side contacts of lower detent 712 near the second moving contact 42, upper detent 711 rotates by the first limit shaft near the opposite side of upper locating shaft 721 on interlock plate 3, lower detent 712 rotates by the second limit shaft near the opposite side of lower locating shaft 722 on interlock plate 3, upper detent 711, lower detent 712 all with interlock plate 3 interlock, detent 711 and lower detent 712 can be rotated under the drive of interlock plate 3, go up detent 711 simultaneously, the place of being rotatably connected of lower detent 712 is equipped with elastic component 73, elastic component 73 is preferably torsion spring, two torsion springs are set on the first limit shaft and the second limit shaft respectively, and make elastic component 73 drive upper detent 711, lower detent 712 all the time respectively with upper locating shaft 721, lower locating shaft 722 contacts, upper detent 711 is equipped with inclined-plane 713 with lower detent 712 near the second moving contact 42 side, inclined-plane 713 all tilts along the direction of place to the contact position that is rotatably connected towards the second fixed contact 61 direction.
Press the rear side of seesaw, installation shaft is made to drive interlock plate 3 longitudinally to move upward, and then fixed support 4 is also driven longitudinal on base plate moving upward, go up detent 711 and the place of being rotatably connected of lower detent 712 to be driven and to carry out longitudinal direction and move upward simultaneously, but due to upper detent 711, the opposite side of lower detent 712 respectively with upper locating shaft 721, lower locating shaft 722 contacts, make the position of detent 711 and lower detent 712 in tilting upward, and the first moving contact 41 on fixed support 4 is contacted with the first fixed contact 51, and then the electrical equipment be connected with the first wiring pin 5 is connected.
If when now there is overcurrent, the then armature adhesive of magnetictrip YR, the driving shaft 8 of magnetictrip YR drives the 3rd moving contact 81 transverse movement, be separated with the second moving contact 42 to make the 3rd moving contact 81, and the 3rd moving contact 81 is in transverse movement, can contact with the medial surface of upper detent 711, simultaneously due to the setting on inclined-plane 713, 3rd moving contact 81 contacts with inclined-plane 713 always, rotate with the first limit shaft to make upper detent 711, until the 3rd moving contact 81 no longer with contact, inclined-plane 713, depart from upper detent 711 completely, now go up detent 711 and return to initial position under the effect of torsion spring, continue to contact with upper locating shaft 721, the tripping coil L2 dead electricity of magnetictrip YR afterwards, armature is separated, driving shaft 8 drives the 3rd moving contact 81 to move towards the second moving contact 42, because upper detent 711 intercepts between the 3rd moving contact 81 and the second moving contact 42, 3rd moving contact 81 is being contacted with the lateral surface of upper detent 711 in the second moving contact 42 motion process, ensure that the second moving contact 42 no longer contacts with the 3rd moving contact 81, thus reach the function disconnecting whole circuit when there is overcurrent.
When maintenance completes, when no longer there is overcurrent condition, press the front side of seesaw 2, installation shaft is made to drive interlock plate 3 longitudinally to move downward, go up detent 711 simultaneously and be driven longitudinal moving downward with the place of being rotatably connected of lower detent 712, the lateral surface of detent 711 is no longer contacted with the 3rd moving contact 81, thus make the transverse movement under the effect of the armature of magnetictrip YR of the 3rd moving contact 81, until the 3rd moving contact 81 contacts with the second moving contact 42, make whole piece circuit again can conducting, electric with what treat access next time the first wiring pin 5 connects.
When needing the electrical equipment connected by the second wiring pin 6 to connect, then press the front side of seesaw 2, if there is the situation of overcurrent, then by lower detent 712, the 3rd moving contact 81 is disconnected and reset, it specifically disconnects identical with the above-mentioned situation pressing the rear side of seesaw 2 with reset principle, again repeats no more.
As Fig. 8, 9, shown in 10, in another embodiment, protection switch also comprises locating support 72, detent group 71 comprises detent 711 and lower detent 712, interlock plate 3 is provided with locating shaft 721 and lower locating shaft 722, upper locating shaft 721 and the side contacts of upper detent 711 near the second moving contact 42, lower locating shaft 722 and the side contacts of lower detent 712 near the second moving contact 42, upper detent 711 rotates by the first limit shaft near the opposite side of upper locating shaft 721 on interlock plate 3, lower detent 712 rotates by the second limit shaft near the opposite side of lower locating shaft 722 on interlock plate 3, upper detent 711, lower detent 712 all with interlock plate 3 interlock, detent 711 and lower detent 712 can be moved up and down under the drive of interlock plate 3, go up detent 711 simultaneously, the place of being rotatably connected of lower detent 712 is equipped with elastic component 73, elastic component 73 is preferably torsion spring, two torsion springs are set on the first limit shaft and the second limit shaft respectively, and make elastic component 73 drive upper detent 711, lower detent 712 all the time respectively with upper locating shaft 721, lower locating shaft 722 contacts, upper detent 711 is equipped with inclined-plane 713 with lower detent 712 near the second moving contact 42 side, inclined-plane 713 all tilts along the direction of place to the contact position that is rotatably connected towards the second fixed contact 61 direction.
Press the rear side of seesaw 2, installation shaft is made to drive interlock plate 3 longitudinally to move upward, and then fixed support 4 is also driven longitudinal on base plate moving upward, go up detent 711 and lower detent 712 to be driven and to carry out longitudinal direction and move upward simultaneously, and upper locating shaft 721, lower locating shaft 722 longitudinally moves upward together with interlock plate 3, go up detent 711 and upper locating shaft 721 simultaneously, lower detent 712 contacts all the time with lower locating shaft 722, and then ensure that upper detent 711 does not rotate with lower detent 712 and only lengthwise movement occurs, and the first moving contact 41 on fixed support 4 is contacted with the first fixed contact 51, and then the electrical equipment be connected with the first wiring pin 5 is connected.
If when now there is overcurrent, the then armature adhesive of magnetictrip YR, the driving shaft 8 of magnetictrip YR drives the 3rd moving contact 81 transverse movement, be separated with the second moving contact 42 to make the 3rd moving contact 81, and the 3rd moving contact 81 is in transverse movement, can contact with the medial surface of lower detent 712, simultaneously due to the setting on inclined-plane 713, 3rd moving contact 81 contacts with inclined-plane 713 always, rotate with the first limit shaft to make lower detent 712, until the 3rd moving contact 81 no longer with contact, inclined-plane 713, depart from lower detent 712 completely, this at present detent 712 under the effect of torsion spring, return to initial position, continue to contact with lower locating shaft 722, the tripping coil dead electricity of magnetictrip YR afterwards, armature is separated, driving shaft 8 drives the 3rd moving contact 81 to move towards the second moving contact 42, because lower detent 712 intercepts between the 3rd moving contact 81 and the second moving contact 42, 3rd moving contact 81 is being contacted with the lateral surface of lower detent 712 in the second moving contact 42 motion process, ensure that the second moving contact 42 no longer contacts with the 3rd moving contact 81, thus reach the function disconnecting whole circuit when there is overcurrent.
When maintenance completes, when no longer there is overcurrent condition, press the front side of seesaw 2, installation shaft is made to drive interlock plate 3 longitudinally to move downward, go up detent 711 simultaneously and be driven longitudinal moving downward with lower detent 712, the lateral surface of lower detent 712 is no longer contacted with the 3rd moving contact 81, thus make the transverse movement under the effect of the armature of magnetictrip YR of the 3rd moving contact 81, until the 3rd moving contact 81 contacts with the second moving contact 42, make whole piece circuit again can conducting, electric with what treat access next time the first wiring pin 5 connects.
When needing the electrical equipment connected by the second wiring pin 6 to connect, then press the front side of seesaw 2, if there is the situation of overcurrent, then by upper detent 711, the 3rd moving contact 81 is disconnected and reset, it specifically disconnects identical with the above-mentioned situation pressing the rear side of seesaw 2 with reset principle, again repeats no more.
Protection switch also comprise magnetictrip YR with for controlling the control circuit 1 that magnetictrip YR opens and closes, control circuit 1 comprises rectification unit 11, over-current detection unit 12 and controllable silicon Q1, over-current detection unit 12 is connected to live wire to detect overcurrent, and output voltage, if output voltage is less than the trigger voltage of SCR control pole, then magnetictrip YR does not work; If output voltage is greater than the trigger voltage of SCR control pole, then magnetictrip YR works with the disconnection controlling live wire.
The gate leve of controllable silicon Q1 is connected to over-current detection unit 12 to receive output voltage, and in response to output voltage to make controllable silicon Q1 conducting or shutoff, the input of rectification unit 11 is connected between live wire and zero line, the tripping coil L2 of magnetictrip YR and controllable silicon Q1 is connected to the output of rectification unit 11, magnetictrip YR also disconnects to control live wire in response to controllable silicon Q1, rectification unit 11 comprises the rectifier bridge be made up of D1-D4, voltage on live wire is being passed through rectification, a forward voltage is provided to the anode of controllable silicon Q1, the output of rectifier bridge is also connected with protected location simultaneously, protected location comprises resistance R3 and electric capacity C1, by the effect of resistance R3 and electric capacity C1, controllable silicon can be avoided to damage, improve stability.
Control circuit 1 also comprises indicating member 13, indicating member 13 is connected between live wire and zero line to represent the electric current whether overcurrent flowing through live wire, indicating member 13 comprises the first resistance R1 and the 5th light-emitting diode D5, one end of first resistance R1 is connected to zero line, the other end is connected to the anode of the 5th light-emitting diode D5, and its negative electrode is connected with live wire, makes when electrical equipment is connected, 5th light-emitting diode D5 conducting, and luminescence is in normal operating conditions to indicate electrical equipment.
Control circuit 1 also comprises Overvoltage protecting unit 14, Overvoltage protecting unit 14 is preferably piezo-resistance RV, piezo-resistance RV is a kind of votage limit type protection device, utilize the nonlinear characteristic of piezo-resistance RV, when overvoltage appears at two interpolars of piezo-resistance RV, piezo-resistance RV by voltage clamping to a relatively-stationary magnitude of voltage, thus can realize the protection to late-class circuit, and in this circuit, the model of piezo-resistance RV is preferably 05D301K; Overvoltage protecting unit 14 is connected to the input of rectification unit 11; when the input voltage of rectification unit 11 is too high; the voltage that input voltage clamper is fixed in one by Overvoltage protecting unit 14; one section of piezo-resistance RV is connected to live wire; the other end is connected to zero line; to realize the kinetic energy of overvoltage protection, improve the fail safe of circuit, effectively avoid the situation causing component damage in circuit during overvoltage to occur.
Over-current detection unit 12 also comprises regulon 121, and regulon 121 is in order to the size of regulation output voltage.
The circuit theory of regulon 121 is as follows:
As shown in figure 11, over-current detection unit 12 also comprises induction coil L1, induction coil L1 is coupled to live wire to induce the corresponding induced voltage of output voltage, regulon is potentiometer, potentiometer is connected to induction coil two ends, because the individual shelves resistance of potentiometer is adjustable, and regulate more stable, then the present embodiment preferably uses potentiometer, also resistance can be realized by the connection in series-parallel of resistance adjustable simultaneously, potentiometer is parallel to the two ends of induction coil L1, and potentiometer is connected to provide output voltage with the gate leve of controllable silicon Q1 with one end of induction coil L1 parallel connection, other end ground connection, voltage-stabiliser tube D7 is parallel with between induction coil L1 and potentiometer, with by voltage stabilization within 2V, avoid overtension and cause component damage.
When the external world accesses powerful electrical equipment, such as refrigerator, then there is larger load current I1, if there is the situation of overcurrent, then load current I1 becomes large, by formula E=L Δ I/ Δ t, L is coefficient of self-inductance, namely Δ I becomes large, induction coil L1 is made to induce induced voltage E1, simultaneously according to Ohm's law, the resistance that induced voltage E1 accesses divided by potentiometer, obtain output voltage, then correspond to the larger induced voltage E1 that powerful electrical equipment produces, potentiometer needs to be transferred to less resistance, to provide an output voltage, because potentiometer resistance is less, controllable silicon is divided voltage also larger, when overcurrent, the output voltage that the two ends of potentiometer produce is greater than the trigger voltage of controllable silicon Q1, and then make controllable silicon Q1 conducting, thus magnetictrip YR is worked, disconnect live wire, and when non-overcurrent, owing to there is not curent change, namely induction coil induces induced voltage E1, the output voltage that the two ends of resistance R4 produce is less than trigger voltage, namely controllable silicon Q1 conducting cannot be made, electrical equipment normally uses, thus reach the effect of protection.
If during the low power electrical equipment of extraneous access, such as 1A sound equipment, then there is less load current I2, if there is the situation of overcurrent, then load current I2 becomes large, by formula E=L Δ I/ Δ t, L is coefficient of self-inductance, namely Δ I becomes large, induction coil L2 is made to induce induced voltage E2, and compared to the induced voltage E1 of high-power electric appliance, the induced voltage E2 of low power electric appliance is much smaller, so according to Ohm's law, the resistance that induced voltage accesses divided by potentiometer, obtain output voltage, then correspond to the less induced voltage E2 that low power electrical equipment produces, potentiometer needs to be transferred to larger resistance value, to provide an output voltage, because potentiometer resistance is larger, the voltage that controllable silicon divides is also less, when overcurrent, the output voltage that the two ends of potentiometer produce is greater than the trigger voltage of controllable silicon Q1, and then make controllable silicon Q1 conducting, thus magnetictrip YR is worked, disconnect live wire, and when non-overcurrent, owing to there is not curent change, namely induction coil induces induced voltage E2, the output voltage that the two ends of resistance R4 produce is less than trigger voltage, namely controllable silicon Q1 conducting cannot be made, electrical equipment normally uses, thus reach the effect of protection.
On the sidewall 21 that regulon 121 is arranged at seesaw 2 or roof 22, namely on the potentiometer sidewall 21 that is arranged at seesaw 2 or roof 22, be preferably disposed on sidewall 21, potentiometer realizes the adjustment to resistance by a knob 9, can ensure when the load current change of external world's access, trigger voltage in control circuit 1 does not change, namely potentiometer can be transferred to the load current 0.5A that electrical equipment produces, 1A, 2A, 3A, the any position of 5A ~ 10A makes controllable silicon Q1 trip, make protection switch can protect small electric apparatus (1A sound equipment), also large electrical equipment (air-conditioning can be protected, refrigerator etc.), there is overcurrent in the line, overvoltage, surge, during the faults such as short circuit, protection switch will trip immediately, avoid the generation of fire, improve the fail safe used.
The function of these household electrical appliance protection switch existing protection high or low power electrical equipment, the function having again lightning-protection surge He prevent fire from occurring; In case of short trouble occur, can within 25mS fast trip, by fire eliminate sprout among tooth.
The above is only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, and all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. a household electrical appliance protection switch, comprises magnetictrip and for controlling the control circuit that magnetictrip opens and closes, described control circuit comprises over-current detection unit and controllable silicon;
Described over-current detection unit is connected to live wire to detect overcurrent, and output voltage, if output voltage is less than the trigger voltage of SCR control pole, then magnetictrip does not work; If output voltage is greater than the trigger voltage of SCR control pole, then magnetictrip work disconnects to control live wire, it is characterized in that:
Described over-current detection unit also comprises regulon, and described regulon is in order to the size of regulation output voltage.
2. household electrical appliance protection switch according to claim 1; it is characterized in that: described over-current detection unit also comprises induction coil; described induction coil is coupled to live wire to induce the induced voltage corresponding to output voltage; described regulon is potentiometer, and described potentiometer is connected to induction coil two ends.
3. household electrical appliance protection switch according to claim 1 and 2, it is characterized in that: also comprise the resetting device for being carried out resetting by magnetictrip, described resetting device comprises detent group;
When the armature adhesive of magnetictrip, described detent group is to prop up armature and to disconnect live wire;
When magnetictrip needs to reset, press seesaw and move to drive detent group, described detent group unclamps armature, and armature is resetted with conducting live wire under the driving of back-moving spring.
4. household electrical appliance protection switch according to claim 3, is characterized in that: also comprise interlock plate, fixed support, the first wiring pin and the second wiring pin;
Described first wiring pin is provided with the first fixed contact, and described second wiring pin is provided with the second fixed contact;
Described seesaw and interlock plate interlock, and drive interlock plate lengthwise movement;
Described fixed support is fixedly connected with interlock plate;
Described fixed support is provided with and the first fixed contact, the first moving contact that the second fixed contact is corresponding, and described first moving contact can contact with the first fixed contact or the second fixed contact;
The driving shaft of described magnetictrip is provided with the 3rd moving contact, described fixed support is also provided with second moving contact corresponding with the 3rd moving contact, and described second moving contact can contact with the 3rd moving contact.
5. household electrical appliance protection switch according to claim 4, is characterized in that: also comprise locating support, and described detent group comprises detent and lower detent;
Described locating support is provided with locating shaft and lower locating shaft, and described upper locating shaft and upper detent are near a side contacts of the second moving contact, and described lower locating shaft and lower detent are near a side contacts of the second moving contact;
Described upper detent is rotatably connected with interlock plate near the opposite side of upper locating shaft, and described lower detent is rotatably connected with interlock plate near the opposite side of lower locating shaft, described upper detent, lower detent all with interlock plate interlock;
The place of being rotatably connected of described upper detent, lower detent is equipped with elastic component, and described elastic component drives upper detent, lower detent contacts with upper locating shaft, lower locating shaft respectively.
6. household electrical appliance protection switch according to claim 4, is characterized in that: also comprise locating support, and described detent group comprises detent and lower detent;
Described interlock plate is provided with locating shaft and lower locating shaft, and described upper locating shaft and upper detent are near a side contacts of the second moving contact, and described lower locating shaft and lower detent are near a side contacts of the second moving contact;
Described upper detent is rotatably connected with interlock plate near the opposite side of upper locating shaft, and described lower detent is rotatably connected with interlock plate near the opposite side of lower locating shaft, described upper detent, lower detent all with interlock plate interlock;
The place of being rotatably connected of described upper detent, lower detent is equipped with elastic component, and described elastic component drives upper detent, lower detent contacts with upper locating shaft, lower locating shaft respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510413228.8A CN104979794B (en) | 2015-07-15 | 2015-07-15 | Household electrical appliance protection switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510413228.8A CN104979794B (en) | 2015-07-15 | 2015-07-15 | Household electrical appliance protection switch |
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| Publication Number | Publication Date |
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| CN104979794A true CN104979794A (en) | 2015-10-14 |
| CN104979794B CN104979794B (en) | 2017-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510413228.8A Active CN104979794B (en) | 2015-07-15 | 2015-07-15 | Household electrical appliance protection switch |
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| US4688134A (en) * | 1985-01-10 | 1987-08-18 | Slater Electric Inc. | Ground fault circuit interrupter and electronic detection circuit |
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| CN201515109U (en) * | 2009-04-15 | 2010-06-23 | 黄华道 | Novel leakage protection socket |
| CN101980351A (en) * | 2010-11-04 | 2011-02-23 | 厦门振泰成科技有限公司 | Rocker-type single-wire double-connection double-insurance switch |
| CN103745895A (en) * | 2014-01-02 | 2014-04-23 | 葛剑优 | Flipping switch capable of preventing overcurrent, overvoltage and short circuit |
| CN204794006U (en) * | 2015-07-15 | 2015-11-18 | 乐清市韦尔软磁电子科技有限公司 | Domestic appliance protection switch |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4688134A (en) * | 1985-01-10 | 1987-08-18 | Slater Electric Inc. | Ground fault circuit interrupter and electronic detection circuit |
| CN101236866A (en) * | 2008-02-13 | 2008-08-06 | 浙江正泰建筑电器有限公司 | Current-leakage protection switch for forward non-buckle release machine |
| CN201515109U (en) * | 2009-04-15 | 2010-06-23 | 黄华道 | Novel leakage protection socket |
| CN101980351A (en) * | 2010-11-04 | 2011-02-23 | 厦门振泰成科技有限公司 | Rocker-type single-wire double-connection double-insurance switch |
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| Publication number | Publication date |
|---|---|
| CN104979794B (en) | 2017-11-28 |
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