CN104795789A - Automatic monitoring circuit for earth fault leakage protector - Google Patents
Automatic monitoring circuit for earth fault leakage protector Download PDFInfo
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- CN104795789A CN104795789A CN201510124922.8A CN201510124922A CN104795789A CN 104795789 A CN104795789 A CN 104795789A CN 201510124922 A CN201510124922 A CN 201510124922A CN 104795789 A CN104795789 A CN 104795789A
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Abstract
The invention discloses an automatic monitoring circuit for an earth fault leakage protector having an automatic monitoring function. The earth fault leakage protector comprises a rectifying circuit, a leakage protection circuit, a trip coil and a trip diode and trip coil control circuit; the automatic monitoring circuit comprises a simulation leakage output circuit, an indicating lamp, an indicating lamp power source, a leakage detection circuit, an electrification trigger circuit, a trigger turn-off circuit and a circulation trigger circuit; the circulation trigger circuit comprises a trigger capacitor which is connected with a trigger end of an indicating lamp control circuit, a start trigger circuit which charges the trigger capacitor and a termination trigger discharging circuit which discharges the trigger capacitor. The automatic monitoring circuit for the earth fault leakage protector can be widely applied to electrical equipment, such as a power socket, using alternating current.
Description
Technical field
The present invention relates to a kind of earth fault earth leakage protective device, be specifically related to a kind of automatic monitoring circuit of earth fault earth leakage protective device.
Background technology
At present; the electric equipments such as the supply socket of the outlet U.S. need meet the regulation in the UL943A.5.16.2 clause implemented for 2015; under the condition of earth fault earth leakage protective device and GFCI (Ground Fault Circuit Interrupter) wiring routinely (non-reverse wiring); during GFCI power supply terminal alternate energisation; earth fault earth leakage protective device need possess automatic monitoring brake, and so-called automatic monitoring brake comprises: start in power supply or face terminals are energized 5 seconds and repeat at least 3 hours automatically to detect once.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of automatic monitoring circuit possessing the earth fault earth leakage protective device of automatic monitoring brake.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of automatic monitoring circuit of earth fault earth leakage protective device, described earth fault earth leakage protective device includes: rectification circuit, electric-leakage detection circuit, tripping coil, dropout diode and for controlling the tripping coil control circuit whether tripping coil is connected, one end access of tripping coil and the AC input lines of true electric leakage signal homophase, the other end of tripping coil is connected with the respective end of dropout diode, the other end of dropout diode is connected with the respective end of tripping coil control circuit, the ground wire of another termination rectification circuit of tripping coil control circuit and direct current ground, when electric-leakage detection circuit detects leakage current, export electric leakage signal, when tripping coil control circuit is driven by true electric leakage signal, tripping coil drives corresponding tripping mechanism action, described automatic monitoring circuit includes:
Simulation electric leakage output circuit, it exports phase place differs 180 degree simulation electrical leakage voltage with true electric leakage signal;
Indicator light, whether the work being used to indicate earth fault earth leakage protective device and automatic monitoring circuit is normal;
Pilot lamp power, it provides operating voltage to indicator light, simultaneously for simulation electric leakage output circuit provides trigger voltage;
Indicating lamp control circuit, whether it controls indicator light and connects, and simultaneously whether it goes back control simulation electric leakage output circuit and connect;
Energising circuits for triggering, it, when earth fault earth leakage protective device is energized, provides trigger voltage to the trigger end of indicating lamp control circuit;
Trigger turn-off circuit, its earth fault earth leakage protective device energising after setting-up time in, cancel the trigger voltage be added on the trigger end of indicating lamp control circuit;
Circulation circuits for triggering, its circulation timei in setting then, for the trigger end of indicating lamp control circuit provides trigger voltage, light indicator light, then, under the effect of the simulation electric leakage signal of electric-leakage detection circuit output, cancel the trigger voltage of the trigger end of indicating lamp control circuit, extinguish indicator light, again wait for described circulation timei, so circulate.
Preferably; in the automatic monitoring circuit of described earth fault earth leakage protective device; described indicating lamp control circuit comprises: indicator light controls adjustable voltage stabilizer and one for improving the triggering threshold voltage-stabiliser tube of the voltage threshold of triggering signal, makes the triggering of indicating lamp control circuit more stable.
Preferably; in the automatic monitoring circuit of described earth fault earth leakage protective device, described energising circuits for triggering comprise: a unidirectional diac be greater than between the triggering threshold voltage-stabiliser tube in the energising triggering half-wave voltage stabilizing circuit of the trigger voltage of indicating lamp control circuit, the output being arranged on energising triggering half-wave voltage stabilizing circuit and described indicating lamp control circuit.
Preferably; in the automatic monitoring circuit of described earth fault earth leakage protective device, described trigger turn-off circuit comprises: charging and voltage stabilizing electric capacity, the shutoff charging and voltage stabilizing circuit triggering shutoff adjustable voltage stabilizer and be extremely connected with the control that triggering turns off adjustable voltage stabilizer.
Preferably; in the automatic monitoring circuit of described earth fault earth leakage protective device; described shutoff charging and voltage stabilizing circuit includes and turns off charging current limiter resistance and turn off threshold voltage-stabiliser tube; the one end turning off charging current limiter resistance is connected with the negative electrode turning off threshold voltage-stabiliser tube; the other end turning off charging current limiter resistance is connected with the negative electrode of dropout diode, and the anode turning off threshold voltage-stabiliser tube is extremely connected with the control that triggering turns off adjustable voltage stabilizer.
Preferably; in the automatic monitoring circuit of described earth fault earth leakage protective device; described circulation circuits for triggering comprise: the triggering electric capacity be connected with the trigger end of indicating lamp control circuit and trigger charging circuit to the unlatching of this triggering capacitor charging and to the termination triggering discharges circuit of this triggering capacitor discharge, stop triggering discharges circuit and are triggered by described simulation electric leakage signal.
Preferably; in the automatic monitoring circuit of described earth fault earth leakage protective device; described unlatching triggers charging circuit and comprises: open to trigger voltage stabilizing circuit and open and trigger charging current limiter resistance; this unlatching triggers voltage stabilizing circuit and turns off charging and voltage stabilizing circuit multiplexer; open the one end of triggering charging current limiter resistance to be connected with the negative electrode turning off threshold voltage-stabiliser tube, open the other end triggering charging current limiter resistance and be connected with the respective end triggering electric capacity.
Preferably; in the automatic monitoring circuit of described earth fault earth leakage protective device; described termination triggering discharges circuit comprises: multiplexing tripping coil control circuit and string are located at the unidirected discharge diode between tripping coil control circuit and described triggering electric capacity, is provided with triggering electric capacity of voltage regulation between the trigger end of tripping coil control circuit and described direct current ground.
Preferably, in the automatic monitoring circuit of described earth fault earth leakage protective device, described rectification circuit is full bridge rectifier.
The invention has the beneficial effects as follows: the present invention is by producing the simulation electrical leakage voltage of phase place and true electric leakage signal phase 180 degree; make to stop triggering discharges circuit and can trigger with unlatching the respective end that charging circuit is connected to dropout diode jointly; achieve and automatically detect at setting-up time Inner eycle; and be energized circuits for triggering and trigger turn-off circuit can be guaranteed automatically to detect in 5 seconds of power supply energising, so just the automatic monitoring circuit of whole earth fault earth leakage protective device is made to have possessed automatic monitoring brake.In addition, the present invention also realizes circulation automatic detection function by indicating lamp control circuit and the multiplexing of tripping coil control circuit, enormously simplify circuit, reduces manufacturing cost.
Accompanying drawing explanation
Fig. 1 is electric theory structure schematic diagram of the present invention.
Reference numeral in Fig. 1 is: 1, detection of electrical leakage chip, 2, pilot lamp power, 3, indicating lamp control circuit, 4, be energized circuits for triggering, and 5, trigger turn-off circuit, 61, open and trigger charging circuit, 62, triggering discharges circuit is stopped, 7, simulation electric leakage output circuit;
DB1, full bridge rectifier, G1, controllable silicon, LED2, indicator light, T1, tripping coil, D1, dropout diode, D2, unidirectional diac, D3, unidirected discharge diode, D7, diode, ZD1, turn off threshold voltage-stabiliser tube, ZD2, trigger threshold voltage-stabiliser tube, ZD3, voltage-stabiliser tube, ZD4, voltage-stabiliser tube, R1, resistance, R2, open and trigger charging current limiter resistance, R3, turn off charging current limiter resistance, R5, resistance, R6, resistance, R7, resistance, R8, resistance, Q1, trigger and turn off adjustable voltage stabilizer, Q2, indicator light controls adjustable voltage stabilizer, Q3, triode, C1, charging and voltage stabilizing electric capacity, C3, electric capacity, C4, trigger electric capacity, C5, trigger electric capacity of voltage regulation, C6, electric capacity.
Embodiment
Below in conjunction with accompanying drawing, describe the specific embodiments of the automatic monitoring circuit of a kind of earth fault earth leakage protective device of the present invention in detail:
As shown in Figure 1, the automatic monitoring circuit of a kind of earth fault earth leakage protective device (GFCI) of the present invention, normally can work in other words whether the life-span stops for automatically monitoring described earth fault earth leakage protective device, this earth fault earth leakage protective device includes: the full bridge rectifier DB1 be made up of 4 rectifier diodes, (conventional techniques of this area is belonged to primarily of detection of electrical leakage chip 1 and peripheral circuit thereof, not shown in FIG.) electric-leakage detection circuit that forms, tripping coil T1, dropout diode D1 and for controlling the controllable silicon G1 as tripping coil control circuit whether tripping coil T1 connects, go back between the negative electrode of controllable silicon G1 and anode and be connected to the piezo-resistance for the protection of controllable silicon G1, the positive pole of full bridge rectifier DB1 is connected to the power end of detection of electrical leakage chip 1 by the resistance R1 of a 15K0.25W, one end of described tripping coil T1 usually inputs live wire L and is connected with exchanging, the other end of tripping coil T1 is connected with the positive pole of dropout diode D1, the negative pole of dropout diode D1 is connected with the anode of controllable silicon G1, be connected the negative electrode of controllable silicon G1 and the ground wire of full bridge rectifier DB1 and direct current, the control pole of controllable silicon G1 is connected with the electric leakage signal output of detection of electrical leakage chip 1, when detection of electrical leakage chip 1 detects electric leakage signal, be no matter the true electric leakage on alternating current fire wire L or the electric leakage of the simulation on alternating current zero line N time, all export electric leakage signal, when this electric leakage signal is true electric leakage signal, controllable silicon G1 conducting, the electric current flow through in tripping coil T1, be enough to drive tripping mechanism (being generally ferromagnetic iron) action, complete trip action, that is: the connection between alternating current and corresponding electric equipment is cut off,
Described automatic monitoring circuit comprises: simulation electric leakage output circuit 7, indicator light LED2, pilot lamp power 2, indicating lamp control circuit 3, energising circuits for triggering 4, trigger turn-off circuit 5 and circulation circuits for triggering, simulation electric leakage output circuit 7 comprises: diode D7, resistance R5 and R6, triode Q3, in order to produce simulation electric leakage signal, usually by through being used for responding to the zero line after the magnet ring of electric leakage and zero line N1 is connected with the positive pole of diode D7, like this when indicating lamp control circuit 3 is opened, just form phase place differs 180 degree simulation leakage current with true electric leakage signal, detection of electrical leakage chip 1 carries out differential amplify to this electric leakage signal, export simulation electric leakage signal, described indicator light LED2, whether the work being used to indicate earth fault earth leakage protective device and automatic monitoring circuit is normal, described pilot lamp power 2 is the half-wave voltage stabilizing circuit of 12 volts, comprise: 100K resistance R7,12V voltage-stabiliser tube ZD3 and 10UF electric capacity C3, while pilot lamp power 2 provides operating voltage to indicator light LED2, also for the base stage of the triode Q3 in described simulation electric leakage output circuit 7 provides trigger voltage, described indicating lamp control circuit 3 comprises: model is that the indicator light of TL431 controls adjustable voltage stabilizer Q2 and the triggering threshold voltage-stabiliser tube ZD2 (what adopt is 8.3 volts of voltage-stabiliser tubes) for the voltage threshold that improves triggering signal here, whether whether indicator light controls adjustable voltage stabilizer Q2 whether conducting controls indicator light LED2 to connect, also control simulation electric leakage output circuit 7 simultaneously and connect, described energising circuits for triggering 4, comprise: energising triggers half-wave voltage stabilizing circuit and is arranged on the unidirectional diac D2 between the triggering threshold voltage-stabiliser tube ZD2 in this energising triggering half-wave voltage stabilizing circuit and described indicating lamp control circuit 3, the voltage that this energising triggers the output of half-wave voltage stabilizing circuit is 12 volts, be greater than the trigger voltage (indicator light controls the pressure drop 8.3 volts=10.8 volts of the trigger voltage 2.5 volts+triggering threshold voltage-stabiliser tube ZD2 of adjustable voltage stabilizer Q2) of indicating lamp control circuit 3, described energising triggers half-wave voltage stabilizing circuit and comprises: 100K resistance R8, 12V voltage-stabiliser tube ZD4 and 10UF electric capacity C6, described energising circuits for triggering 4 are when earth fault earth leakage protective device is energized, namely the control pole that the negative electrode being triggered threshold voltage-stabiliser tube ZD2 by the trigger end of indicating lamp control circuit 3 controls adjustable voltage stabilizer Q2 to indicator light provides trigger voltage, indicator light is made to control adjustable voltage stabilizer Q2 conducting, described trigger turn-off circuit 5, comprise: charging and voltage stabilizing electric capacity C1, the triggering that model is TL431 turns off adjustable voltage stabilizer Q1 and provides the shutoff charging and voltage stabilizing circuit of trigger voltage and the multiplexing dropout diode D1 and tripping coil T1 with earth fault earth leakage protective device for triggering shutoff adjustable voltage stabilizer Q1, described shutoff charging and voltage stabilizing circuit comprises: turn off charging current limiter resistance R3 and turn off threshold voltage-stabiliser tube ZD1, this shutoff threshold voltage-stabiliser tube ZD1 is greater than the voltage-stabiliser tube (what adopt is the voltage-stabiliser tube of 18V) that energising triggers the output voltage of half-wave voltage stabilizing circuit here, trigger the anode turning off adjustable voltage stabilizer Q1 and connect direct current ground, trigger the negative electrode turning off adjustable voltage stabilizer Q1 to be connected with the output that energising triggers half-wave voltage stabilizing circuit, trigger the control pole turning off adjustable voltage stabilizer Q1 to be connected with the anode turning off threshold voltage-stabiliser tube ZD1, the positive pole of the negative electrode and charging and voltage stabilizing electric capacity C1 that turn off threshold voltage-stabiliser tube ZD1 is all connected with the one end turning off charging current limiter resistance R3, the other end turning off charging current limiter resistance R3 is connected with the negative electrode of dropout diode D1, the negative pole of charging and voltage stabilizing electric capacity C1 connects direct current ground, in the setting-up time (5 seconds of the regulation in UL943A.5.16.2 clause) of this trigger turn-off circuit 5 after the energising of earth fault earth leakage protective device, guarantee that charging and voltage stabilizing electric capacity C1 charges to about 20.5V, make to trigger and turn off adjustable voltage stabilizer Q1 conducting, the output voltage that energising triggers half-wave voltage stabilizing circuit is dragged down, to cancel the trigger voltage on the trigger end being added in indicating lamp control circuit 3, indicator light is made to control adjustable voltage stabilizer Q2 cut-off, described circulation circuits for triggering, comprise: the triggering electric capacity C4 that the negative electrode namely triggering threshold voltage-stabiliser tube ZD2 with the trigger end of indicating lamp control circuit 3 is connected, and to the termination triggering discharges circuit 62 that the unlatching that this triggering electric capacity C4 charges triggers charging circuit 61 and discharges to this triggering electric capacity C4, described unlatching triggers charging circuit 61 and comprises: open to trigger voltage stabilizing circuit and open and trigger charging current limiter resistance R2, this unlatching triggers voltage stabilizing circuit and turns off charging and voltage stabilizing circuit multiplexer, open the one end of triggering charging current limiter resistance R2 to be connected with the negative electrode turning off threshold voltage-stabiliser tube ZD1, open the other end triggering charging current limiter resistance R2 to be connected with the respective end triggering electric capacity C4, described termination triggering discharges circuit 62 comprises: and the multiplexing tripping coil control circuit of earth fault earth leakage protective device and controllable silicon G1 and string are located at the unidirected discharge diode D3 between controllable silicon G1 and described triggering electric capacity C4, be provided with and trigger electric capacity of voltage regulation C5 between the control pole of controllable silicon G1 and described direct current ground.
The operation principle of earth fault earth leakage protective device of the present invention is:
When leakage current is greater than 6mA, detection of electrical leakage chip 1 carries out differential amplify to this electric leakage signal, exports the triggering signal of high level, drive controllable silicon G1, controllable silicon G1 is opened, and makes tripping coil T1 obtain electric current, produce magnetic field force, promote the iron core motion in tripping coil T1, complete trip action; This principle is also applicable to detection of electrical leakage, when Pen-down detection button, produce leakage current and be greater than 6mA, detection of electrical leakage chip 1 carries out differential amplify to this electric leakage signal, export the triggering signal of high level, drive controllable silicon G1, controllable silicon G1 is opened, and makes tripping coil T1 obtain electric current, produce magnetic field force, promote the iron core motion in tripping coil T1, iron core drives lock pin and the back-moving spring motion of resetting system, completes detection of electrical leakage.
The operation principle of automatic monitoring circuit of the present invention is: be energized, energising triggers half-wave voltage stabilizing circuit directly allows the link triggering electric capacity C4 and triggering threshold voltage-stabiliser tube ZD2 be in the high potential of about 11.3V by unidirectional diac D2, indicator light is made to control adjustable voltage stabilizer Q2 conducting, indicator light LED2 lights, meanwhile, by triode Q3, resistance R5 and R6, the simulation electric leakage output circuit 7 that diode D7 forms starts, alternating current fire wire (also claiming phase line) L is through tripping coil T1, dropout diode D1 and shutoff charging current limiter resistance R3 charges to charging and voltage stabilizing electric capacity C1, by selecting the charging and voltage stabilizing electric capacity C1 of suitable shutoff charging current limiter resistance R3, guarantee in 5 seconds, the current potential of charging and voltage stabilizing electric capacity C1 is allowed to rise to about 20.5V, make to trigger and turn off adjustable voltage stabilizer Q1 conducting, the output voltage that energising triggers half-wave voltage stabilizing circuit is dragged down, so just cancel the trigger voltage on the trigger end being added in indicating lamp control circuit 3, indicator light controls adjustable voltage stabilizer Q2 cut-off, if GFCI circuit normally works, when triggering electric capacity C4 charges to indicator light control adjustable voltage stabilizer Q2 conducting, simulation electric leakage output circuit 7 and indicator light LED2 all connect, detection of electrical leakage chip 1 produces simulation leakage trigger signal, go to drive controllable silicon G1, make controllable silicon G1 conducting, like this, trigger electric capacity C4 through unidirected discharge diode D3, discharged by controllable silicon G1, control pole (3 pin) voltage that indicator light controls adjustable voltage stabilizer Q2 is dragged down, indicator light controls adjustable voltage stabilizer Q2 cut-off, indicator light LED2 extinguishes, it is once glittering that above process shows as indicator light LED2, achieve the function of self-inspection in latter 5 seconds of GFCI energising.After triggering and turning off adjustable voltage stabilizer Q1 conducting, trigger 1 pin turning off adjustable voltage stabilizer Q1 and keep low level always, self-inspection can not be circulated generation, until be again energized after GFCI power-off.
And when GFCI circuit occurs abnormal, such as tripping coil T1 or dropout diode D1 disconnect, trigger the control pole turning off adjustable voltage stabilizer Q1 and can not get trigger voltage, trigger turn off adjustable voltage stabilizer Q1 cannot conducting, triggering electric capacity C4 is high potential all the time, indicator light controls adjustable voltage stabilizer Q2 and is in opening state all the time, the normal bright warning of indicator light LED2; Or when full bridge rectifier DB1 or resistance R1 breaks down, detection of electrical leakage chip 1 does not have leakage trigger signal to produce, controllable silicon G1 does not open, trigger electric capacity C4 cannot discharge, the 3 pin voltages of indicator light control adjustable voltage stabilizer Q2 meet all the time opens condition, the normal bright warning of indicator light LED2; Or the simulation electric leakage output circuit 7 of the element compositions such as triode Q3, diode D7 breaks down, the differential amplifier of detection of electrical leakage chip 1 does not have electric leakage signal to input, detection of electrical leakage chip 1 does not just have leakage trigger signal to export yet, controllable silicon G1 is in cut-off state all the time, trigger electric capacity C4 and do not put electricity equally, indicator light controls adjustable voltage stabilizer Q2 and meets condition of opening and conducting, the normal bright warning of indicator light LED2 all the time because it controls pole (3 pin).
Completing in latter 5 seconds of GFCI energising after self-inspection, enter end-of-life self-inspection (in 3 hours, self-inspection once), alternating current fire wire L is by tripping coil T1, dropout diode D1, after turning off charging current limiter resistance R3 and charging and voltage stabilizing electric capacity C1 and turning off threshold voltage-stabiliser tube ZD1 voltage stabilizing, through opening triggering charging current limiter resistance R2, triggering electric capacity C4 is charged, trigger charging current limiter resistance R2 by selecting suitable unlatching and trigger electric capacity C4, time triggering electric capacity C4 being charged to the condition of opening meeting indicator light control adjustable voltage stabilizer Q2 controls at about 30 minutes usually, after indicator light control adjustable voltage stabilizer Q2 opens, indicator light LED2 lights.When GFCI circuit normally works, the simulation electric leakage output circuit 7 be made up of resistance R5 and R6, triode Q3 and diode D7 etc. starts, then controllable silicon G1 obtains triggering signal and conducting, trigger electric capacity C4 to be discharged by unidirected discharge diode D3 and controllable silicon G1, the voltage that indicator light controls the control pole (3 pin) of adjustable voltage stabilizer Q2 is dragged down, indicator light is made to control adjustable voltage stabilizer Q2 cut-off, indicator light LED2 extinguishes, to show as indicator light LED2 once glittering for whole process above, this completes a self-checking function.Because the state that indicator light controls adjustable voltage stabilizer Q2 is capable of circulation, so afterwards every circulation self-inspection in 30 minutes once, ensure that repeatedly life-span self-inspection in 3 hours.When GFCI occurs abnormal, such as: triggering electric capacity C4 disconnection, the voltage turned off on threshold voltage-stabiliser tube ZD1 negative electrode directly opens indicator light control adjustable voltage stabilizer Q2, the normal bright warning of indicator light LED2 through opening triggering charging current limiter resistance R2; If again: tripping coil T1 or dropout diode D1 damages, then triggering shutoff adjustable voltage stabilizer Q1 can not open, and indicator light controls adjustable voltage stabilizer Q2 conducting all the time, the normal bright warning of indicator light LED2; If the simulation that resistance R5, triode Q3 and diode D7 form again is leaked electricity, output circuit 7 or full bridge rectifier DB1 or resistance R1 break down, controllable silicon G1 cannot open, trigger electric capacity C4 cannot discharge, indicator light controls adjustable voltage stabilizer Q2 and is in opening state all the time, the normal bright warning of indicator light LED2.
When the normal bright warning of indicator light LED2, inform that the life-span of user GFCI stops exactly, need the GFCI more renewed, guarantee user's property and life security.Certainly, GFCI after powered up in 5 seconds or afterwards 3 hours indicator light LED2 do not light, be caused by automatic monitoring circuit faults itself, need user to change automatic monitoring circuit.
In sum, be only preferred embodiment of the present invention, not be used for limiting scope of the invention process, all equalizations done according to shape, structure, feature and the spirit described in the claims in the present invention scope change and modify, and all should be included in right of the present invention.
Claims (9)
1. the automatic monitoring circuit of an earth fault earth leakage protective device, described earth fault earth leakage protective device comprises: rectification circuit, electric-leakage detection circuit, tripping coil, dropout diode and for controlling the tripping coil control circuit whether tripping coil is connected, one end access of tripping coil and the AC input lines of true electric leakage signal homophase, the other end of tripping coil is connected with the respective end of dropout diode, the other end of dropout diode is connected with the respective end of tripping coil control circuit, the ground wire of another termination rectification circuit of tripping coil control circuit and direct current ground, when electric-leakage detection circuit detects leakage current, export electric leakage signal, when tripping coil control circuit is driven by true electric leakage signal, tripping coil drives corresponding tripping mechanism action, it is characterized in that, described automatic monitoring circuit includes:
Simulation electric leakage output circuit, it exports phase place differs 180 degree simulation electrical leakage voltage with true electric leakage signal;
Indicator light, whether the work being used to indicate earth fault earth leakage protective device and automatic monitoring circuit is normal;
Pilot lamp power, it provides operating voltage to indicator light, simultaneously for simulation electric leakage output circuit provides trigger voltage;
Indicating lamp control circuit, whether it controls indicator light and connects, and simultaneously whether it goes back control simulation electric leakage output circuit and connect;
Energising circuits for triggering, it, when earth fault earth leakage protective device is energized, provides trigger voltage to the trigger end of indicating lamp control circuit;
Trigger turn-off circuit, its earth fault earth leakage protective device energising after setting-up time in, cancel the trigger voltage be added on the trigger end of indicating lamp control circuit;
Circulation circuits for triggering, its circulation timei in setting then, for the trigger end of indicating lamp control circuit provides trigger voltage, light indicator light, then, under the effect of the simulation electric leakage signal of electric-leakage detection circuit output, cancel the trigger voltage of the trigger end of indicating lamp control circuit, extinguish indicator light, again wait for described circulation timei, so circulate.
2. according to the automatic monitoring circuit of the earth fault earth leakage protective device described in claim 1; it is characterized in that; described indicating lamp control circuit comprises: indicator light controls adjustable voltage stabilizer and one for improving the triggering threshold voltage-stabiliser tube of the voltage threshold of triggering signal, makes the triggering of indicating lamp control circuit more stable.
3. the automatic monitoring circuit of earth fault earth leakage protective device according to claim 2; it is characterized in that, described energising circuits for triggering comprise: a unidirectional diac be greater than between the triggering threshold voltage-stabiliser tube in the energising triggering half-wave voltage stabilizing circuit of the trigger voltage of indicating lamp control circuit, the output being arranged on energising triggering half-wave voltage stabilizing circuit and described indicating lamp control circuit.
4. the automatic monitoring circuit of earth fault earth leakage protective device according to claim 2; it is characterized in that, described trigger turn-off circuit comprises: charging and voltage stabilizing electric capacity, the shutoff charging and voltage stabilizing circuit triggering shutoff adjustable voltage stabilizer and be extremely connected with the control that triggering turns off adjustable voltage stabilizer.
5. the automatic monitoring circuit of earth fault earth leakage protective device according to claim 4; it is characterized in that; described shutoff charging and voltage stabilizing circuit includes and turns off charging current limiter resistance and turn off threshold voltage-stabiliser tube; the one end turning off charging current limiter resistance is connected with the negative electrode turning off threshold voltage-stabiliser tube; the other end turning off charging current limiter resistance is connected with the negative electrode of dropout diode, and the anode turning off threshold voltage-stabiliser tube is extremely connected with the control that triggering turns off adjustable voltage stabilizer.
6. the automatic monitoring circuit of earth fault earth leakage protective device according to claim 5; it is characterized in that; described circulation circuits for triggering comprise: the triggering electric capacity be connected with the trigger end of indicating lamp control circuit and trigger charging circuit to the unlatching of this triggering capacitor charging and to the termination triggering discharges circuit of this triggering capacitor discharge, stop triggering discharges circuit and are triggered by described simulation electric leakage signal.
7. the automatic monitoring circuit of earth fault earth leakage protective device according to claim 6; it is characterized in that; described unlatching triggers charging circuit and comprises: open to trigger voltage stabilizing circuit and open and trigger charging current limiter resistance; this unlatching triggers voltage stabilizing circuit and turns off charging and voltage stabilizing circuit multiplexer; open the one end of triggering charging current limiter resistance to be connected with the negative electrode turning off threshold voltage-stabiliser tube, open the other end triggering charging current limiter resistance and be connected with the respective end triggering electric capacity.
8. the automatic monitoring circuit of earth fault earth leakage protective device according to claim 6; it is characterized in that; described termination triggering discharges circuit comprises: multiplexing tripping coil control circuit and string are located at the unidirected discharge diode between tripping coil control circuit and described triggering electric capacity, is provided with triggering electric capacity of voltage regulation between the trigger end of tripping coil control circuit and described direct current ground.
9. the automatic monitoring circuit of earth fault earth leakage protective device according to any one of claim 1 to 8, is characterized in that, described rectification circuit is full bridge rectifier.
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Cited By (5)
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| CN108666972A (en) * | 2017-04-01 | 2018-10-16 | 苏州益而益电器制造有限公司 | Earth leakage protective device |
| CN108736439A (en) * | 2018-07-20 | 2018-11-02 | 余姚市嘉荣电子电器有限公司 | A kind of earth leakage protective device |
| CN110165633A (en) * | 2019-05-15 | 2019-08-23 | 张家港市佰瑞普电器科技有限公司 | A kind of control circuit of ground fault earth leakage protective device and force tripping method |
| CN110297151A (en) * | 2019-05-24 | 2019-10-01 | 温州华亚电气有限公司 | A kind of observation circuit protection circuit of ground fault earth leakage protective device operation troubles |
| WO2020228104A1 (en) * | 2019-05-10 | 2020-11-19 | 浙江大学 | Self-check chip of leakage protector |
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