CN205489453U - Leakage protective circuit - Google Patents
Leakage protective circuit Download PDFInfo
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- CN205489453U CN205489453U CN201620011844.0U CN201620011844U CN205489453U CN 205489453 U CN205489453 U CN 205489453U CN 201620011844 U CN201620011844 U CN 201620011844U CN 205489453 U CN205489453 U CN 205489453U
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Abstract
The utility model discloses a leakage protective circuit relates to the circuit field, the circuit includes: alternating current power supply, control circuit, switch circuit, leakage detection circuit, reset circuit, bypass circuit, earth -leakage detection circuit, current transformer and load, alternating current power supply is connected with control circuit's input, control circuit's output is connected with switch circuit's input, switch circuit's first output and second output pass current transformer, the both ends of leakage detection circuit are connected with current transformer's secondary winding's both ends, the output of leakage detection circuit is connected with control circuit's input, the bypass circuit is connected with alternating current power supply, reset circuit and leakage detection circuit connection, the earth -leakage detection circuit is connected with the both ends of current transformer's primary coil. The utility model discloses circuit structure is simple, and reasonable in design is with low costs, and earth leakage protection is effectual.
Description
Technical field
This utility model relates to circuit field, particularly to a kind of leakage protection circuit.
Background technology
Electric leakage be between electrical appliance shell and civil power live wire for a certain reason connection after and ground between have certain potential difference to produce; when there is electric leakage, holding fire hazardous, consequence is hardly imaginable; so when powering for air purifier, also electric leakage being protected nothing more than needs.
Earth leakage protective device of the prior art mainly includes release lever, coil block and button assembly; wherein coil block is configured to make release lever turn to trip positions from initial position; to realize circuit breaker tripping; button assembly configuration user makes release lever turn to initial position from trip positions, thus realizes earth leakage protective.But above-mentioned earth leakage protective device is to realize earth leakage protective from frame for movement, and earth leakage protective effect is poor.
Utility model content
In view of this, this utility model provides a kind of leakage protection circuit, and its circuit structure is simple, reasonable in design, low cost, and earth leakage protective is effective.
This utility model solves the problems referred to above by techniques below means:
A kind of leakage protection circuit of the present utility model, including: alternating current power supply, control circuit, on-off circuit, electric-leakage detection circuit, reset circuit, bypass circuit, leakage tests circuit, current transformer and load；Described alternating current power supply is connected with the input of described control circuit, the outfan of described control circuit is connected with the input of described on-off circuit, first outfan of described on-off circuit and the second outfan are connected with described load after described current transformer, two inputs of described electric-leakage detection circuit two ends with the secondary coil of described current transformer respectively are connected, the outfan of described electric-leakage detection circuit is connected with the input of described control circuit, described bypass circuit is connected with described alternating current power supply, described reset circuit is connected with described electric-leakage detection circuit, described leakage tests circuit is connected with the two ends of the primary coil of described current transformer.
nullFurther，Described control circuit includes: diode D1、Resistance R1、Resistance R2、Resistance R3、Electric capacity C1、Audion Q1 and electric bridge DR，The positive pole of described diode D1 is connected with the live wire end of described alternating current power supply，The negative pole of described diode D1 is by the resistance R1 being sequentially connected in series、Resistance R2 and resistance R3 is connected with the base stage of described audion Q1，The colelctor electrode of described audion Q1 is connected with first end of described electric bridge DR，Second end of described electric bridge DR is connected with the zero line side of described alternating current power supply，One end of described electric capacity C1 is connected with the base stage of described audion Q1，The other end of described electric capacity C1、3rd end of described electric bridge DR、The equal ground connection of emitter stage of described audion Q1，The positive pole of described diode D1 is as the input of described control circuit，4th end of described electric bridge DR is as the outfan of described control circuit.
nullFurther，Described on-off circuit includes: relay coil KM、First normally opened contact KM1 of relay、Second normally opened contact KM2 of relay、Resistance R4、Resistance R5 and light emitting diode D2，One end of described relay coil KM is connected with the live wire end of described alternating current power supply，The other end of described relay coil KM is connected with one end of described resistance R4，The other end of described resistance R4 is connected with the positive pole of described light emitting diode D2，The negative pole of described light emitting diode D2 is connected by second end of described resistance R5 and described electric bridge DR，Described one end of first normally opened contact KM1 is connected with the live wire end of described alternating current power supply，The other end of described first normally opened contact KM1 passes described current transformer T1，Fire wire output end as described alternating current power supply，Described one end of second normally opened contact KM2 is connected with the zero line side of described alternating current power supply，The other end of described second normally opened contact KM2 passes described D.C mutual-inductor T1，Zero line side as described alternating current power supply connects，One end of described relay coil KM is as the input of described on-off circuit，The other end of described first normally opened contact KM1 is as the first outfan of described on-off circuit，The other end of described second normally opened contact KM2 is as the second outfan of described on-off circuit.
nullFurther，Described electric-leakage detection circuit includes earth leakage protective device LW54123、Audion Q2、Resistance R6、Resistance R7、Resistance R8、Resistance R9、Resistance R10、Resistance R11、Electric capacity C2、Electric capacity C3、Electric capacity C4、Electric capacity C5、Electric capacity C6、Electric capacity C7、Diode D3、Diode D4 and diode D5，1st pin of described earth leakage protective device LW54123 is connected with one end of described resistance R6，The other end of described resistance R6 is connected with one end of the secondary coil of described current transformer T1，And resistance R7 in parallel and electric capacity C2 ground connection，6th pin of described earth leakage protective device LW54123 is connected by the base stage of described electric capacity C3 with described audion Q2，The colelctor electrode of described audion Q2 is connected with the base stage of described audion Q1，One end that 8th pin of described earth leakage protective device LW54123 is connected with described resistance R2 and described resistance R3 by resistance R8 connects，2nd pin of described earth leakage protective device LW54123 is connected with the other end of the secondary coil of described current transformer by resistance R9，Described resistance R10 is in parallel with the two ends of the secondary coil of described current transformer，The positive pole of described diode D3 is connected with one end of the secondary coil of described current transformer，The negative pole of described diode D3 is connected with the other end of the secondary coil of described current transformer，The positive pole of described diode D4 is connected with the other end of the secondary coil of described current transformer，The negative pole of described diode D4 is connected with the positive pole of described diode D5，The negative pole of described diode D5 is connected with one end of the secondary coil of described current transformer，One end of described resistance R11 is connected with the 2nd pin of described earth leakage protective device LW54123，The other end of described resistance R11 one end with the negative pole of described diode D4 and described electric capacity C4 respectively is connected，The other end of described electric capacity C4 is connected with one end of the secondary coil of described current transformer，One end of described electric capacity C5 is connected with the 2nd pin of described earth leakage protective device LW54123，The other end of described electric capacity C5 is connected with one end of the secondary coil of described current transformer，5th pin of described earth leakage protective device LW54123 the 4th pin and described earth leakage protective device LW54123 is all by described electric capacity C6 ground connection，7th pin of described earth leakage protective device LW54123 passes through described electric capacity C7 ground connection，The 3rd pin ground connection of described earth leakage protective device LW54123，The two ends of the secondary coil of described current transformer are as the input of described electric-leakage detection circuit，8th pin of described earth leakage protective device LW54123 is as the outfan of described electric-leakage detection circuit.
Further, described leakage tests circuit includes: resistance R12 and button K1, one end of described resistance R12 is connected with one end of the primary coil of described current transformer T1, and the other end of described resistance R12 is connected with the other end of the primary coil of described current transformer T1 by described button K1.
Further; described reset circuit includes: button K2, electrochemical capacitor C9 and electric capacity C8; one end of described button K2 is connected with the 8th pin of described earth leakage protective device LW54123; the other end ground connection of described button K2; one end that the positive pole of described electrochemical capacitor C9 is connected with described resistance R2 and described resistance R3 connects; the other end ground connection of described electrochemical capacitor C9, one end of described electric capacity C8 is connected with the 8th pin of described earth leakage protective device LW54123, the other end ground connection of described electric capacity C8.
Further, described bypass circuit includes: varistor ZNR1, varistor ZNR2, electric fuse TF and light emitting diode D6, one end of described electric fuse TF is connected with the live wire end of described alternating current power supply, one end of the other end of the described electric fuse TF described varistor ZNR1 by being sequentially connected in series connects, the other end of described varistor ZNR1 is connected by the positive pole of described varistor NSR2 and described light emitting diode D6, and the negative pole of described light emitting diode D6 is connected with the ground wire of described alternating current power supply.
Leakage protection circuit of the present utility model has the advantages that
The circuit structure of leakage protection circuit the most of the present utility model is simple, reasonable in design and low cost.
Whether leakage protection circuit the most of the present utility model can be leaked electricity by electric-leakage detection circuit detection current transformer, and when detecting that current transformer leaks electricity, disconnects on-off circuit, stops powering load, and earth leakage protective is effective.
In sum, the circuit structure of leakage protection circuit of the present utility model is simple, reasonable in design, low cost, and earth leakage protective is effective.
Accompanying drawing explanation
With embodiment, this utility model is further described below in conjunction with the accompanying drawings.
Fig. 1 is schematic block circuit diagram of the present utility model；
Fig. 2 is physical circuit connection figure of the present utility model.
Detailed description of the invention
Below with reference to accompanying drawing, this utility model is described in detail, as shown in Figure 1: the leakage protection circuit of the present embodiment includes: alternating current power supply 101, control circuit 102, on-off circuit 103, electric-leakage detection circuit 104, reset circuit 105, bypass circuit 106, leakage tests circuit 107, current transformer T1 and load 109.
Described alternating current power supply 101 is connected with the input of described control circuit 102, the outfan of described control circuit 102 is connected with the input of described on-off circuit 103, first outfan of described on-off circuit 103 and the second outfan are connected with described load after described current transformer T1, two inputs of described electric-leakage detection circuit 104 two ends with the secondary coil of described current transformer T1 respectively are connected, the outfan of described electric-leakage detection circuit 104 is connected with the input of described control circuit 102, described bypass circuit 106 is connected with described alternating current power supply 101, described reset circuit 105 is connected with described electric-leakage detection circuit 104, described leakage tests circuit 107 is connected with the two ends of the primary coil of described current transformer T1.
nullIn the present embodiment，As shown in Figure 2，Described control circuit 102 includes: diode D1、Resistance R1、Resistance R2、Resistance R3、Electric capacity C1、Audion Q1 and electric bridge DR，The positive pole of described diode D1 is connected with the live wire end of described alternating current power supply 101，The negative pole of described diode D1 is by the resistance R1 being sequentially connected in series、Resistance R2 and resistance R3 is connected with the base stage of described audion Q1，The colelctor electrode of described audion Q1 is connected with first end of described electric bridge DR，Second end of described electric bridge DR is connected with the zero line side of described alternating current power supply 101，One end of described electric capacity C1 is connected with the base stage of described audion Q1，The other end of described electric capacity C1、3rd end of described electric bridge DR、The equal ground connection of emitter stage of described audion Q1，The positive pole of described diode D1 is as the input of described control circuit 102，4th end of described electric bridge DR is as the outfan of described control circuit 102.
nullIn the present embodiment，As shown in Figure 2，Described on-off circuit 103 includes: relay coil KM、First normally opened contact KM1 of relay、Second normally opened contact KM2 of relay、Resistance R4、Resistance R5 and light emitting diode D2，One end of described relay coil KM is connected with the live wire end of described alternating current power supply 101，The other end of described relay coil KM is connected with one end of described resistance R4，The other end of described resistance R4 is connected with the positive pole of described light emitting diode D2，The negative pole of described light emitting diode D2 is connected by second end of described resistance R5 and described electric bridge DR，One end of described first normally opened contact KM1 is connected with the live wire end of described alternating current power supply 101，The other end of described first normally opened contact KM1 passes described current transformer T1，Fire wire output end as described alternating current power supply 101，One end of described second normally opened contact KM2 is connected with the zero line side of described alternating current power supply 101，The other end of described second normally opened contact KM2 passes described D.C mutual-inductor T1，Zero line side as described alternating current power supply 101 connects，One end of described relay coil KM is as the input of described on-off circuit 103，The other end of described first normally opened contact KM1 is as the first outfan of described on-off circuit 103，The other end of described second normally opened contact KM2 is as the second outfan of described on-off circuit 103.
nullIn the present embodiment，As shown in Figure 2，Described electric-leakage detection circuit 104 includes earth leakage protective device LW54123、Audion Q2、Resistance R6、Resistance R7、Resistance R8、Resistance R9、Resistance R10、Resistance R11、Electric capacity C2、Electric capacity C3、Electric capacity C4、Electric capacity C5、Electric capacity C6、Electric capacity C7、Diode D3、Diode D4 and diode D5，1st pin of described earth leakage protective device LW54123 is connected with one end of described resistance R6，The other end of described resistance R6 is connected with one end of the secondary coil of described current transformer T1，And resistance R7 in parallel and electric capacity C2 ground connection，6th pin of described earth leakage protective device LW54123 is connected by the base stage of described electric capacity C3 with described audion Q2，The colelctor electrode of described audion Q2 is connected with the base stage of described audion Q1，One end that 8th pin of described earth leakage protective device LW54123 is connected with described resistance R2 and described resistance R3 by resistance R8 connects，2nd pin of described earth leakage protective device LW54123 is connected with the other end of the secondary coil of described current transformer by resistance R9，Described resistance R10 is in parallel with the two ends of the secondary coil of described current transformer，The positive pole of described diode D3 is connected with one end of the secondary coil of described current transformer，The negative pole of described diode D3 is connected with the other end of the secondary coil of described current transformer，The positive pole of described diode D4 is connected with the other end of the secondary coil of described current transformer，The negative pole of described diode D4 is connected with the positive pole of described diode D5，The negative pole of described diode D5 is connected with one end of the secondary coil of described current transformer，One end of described resistance R11 is connected with the 2nd pin of described earth leakage protective device LW54123，The other end of described resistance R11 one end with the negative pole of described diode D4 and described electric capacity C4 respectively is connected，The other end of described electric capacity C4 is connected with one end of the secondary coil of described current transformer，One end of described electric capacity C5 is connected with the 2nd pin of described earth leakage protective device LW54123，The other end of described electric capacity C5 is connected with one end of the secondary coil of described current transformer，5th pin of described earth leakage protective device LW54123 the 4th pin and described earth leakage protective device LW54123 is all by described electric capacity C6 ground connection，7th pin of described earth leakage protective device LW54123 passes through described electric capacity C7 ground connection，The 3rd pin ground connection of described earth leakage protective device LW54123，The two ends of the secondary coil of described current transformer are as the input of described electric-leakage detection circuit 104，8th pin of described earth leakage protective device LW54123 is as the outfan of described electric-leakage detection circuit 104.
In the present embodiment, as shown in Figure 2, described leakage tests circuit 107 includes: resistance R12 and button K1, one end of described resistance R12 is connected with one end of the primary coil of described current transformer T1, and the other end of described resistance R12 is connected with the other end of the primary coil of described current transformer T1 by described button K1.
Concrete, user can occur the phenomenon of electric leakage by controlling the fictitious load of opening and close of button K1.
In the present embodiment; as shown in Figure 2; described reset circuit 105 includes: button K2, electrochemical capacitor C9 and electric capacity C8; one end of described button K2 is connected with the 8th pin of described earth leakage protective device LW54123; the other end ground connection of described button K2; one end that the positive pole of described electrochemical capacitor C9 is connected with described resistance R2 and described resistance R3 connects; the other end ground connection of described electrochemical capacitor C9; one end of described electric capacity C8 is connected with the 8th pin of described earth leakage protective device LW54123, the other end ground connection of described electric capacity C8.
Concrete; when needs reset; user can push button K2; now; the supply voltage of the 8th pin of earth leakage protective device LW54123 is set to zero, then audion Q1 cut-off, and the first normally opened contact KM1 and the second normally opened contact KM2 of relay also disconnect; leakage protection circuit the most of the present utility model exports without alternating voltage, so that the power supply of whole system stops；After user unclamps button K2; 8th pin of earth leakage protective device LW54123 is powered again; audion Q1 turns on, and the first normally opened contact KM1 and the second normally opened contact KM2 of relay also close, and leakage protection circuit the most of the present utility model starts again to power whole system.
In the present embodiment, as shown in Figure 2, described bypass circuit 106 includes: varistor ZNR1, varistor ZNR2, electric fuse TF and light emitting diode D6, one end of described electric fuse TF is connected with the live wire end of described alternating current power supply, one end of the other end of the described electric fuse TF described varistor ZNR1 by being sequentially connected in series connects, the other end of described varistor ZNR1 is connected by the positive pole of described varistor NSR2 and described light emitting diode D6, and the negative pole of described light emitting diode D6 is connected with the ground wire of described alternating current power supply 101.
Wherein, varistor ZNR1, varistor ZNR2 and light emitting diode D6 form surge absorber.
Concrete, as in figure 2 it is shown, after binding post L IN and N IN accesses 220-240V alternating current power supply, a road electric current flow to the base stage of audion Q1 through diode D1, resistance R1, resistance R2 and resistance R3, due to the grounded emitter of audion Q1, the most now audion Q1 conducting；Another road electric current flow to the audion Q1 of conducting state after relay coil KM and electric bridge BR, it is back to electric bridge BR again, form a path loop, relay coil KM is after the return path of place, start to obtain electric generation magnetic field, so that the first normally opened contact KM1 and the second normally opened contact KM2 Guan Bi, then alternating voltage is by D.C mutual-inductor T1 output extremely load.
When there is electric leakage in load circuit; the magnitude of current of two power lines flowing through binding post L IN and N IN place is inconsistent; cause Current Mutual Inductance coil T1 to produce faradic current to flow out; resistance R10 is faradic current load resistance; diode D3, diode D4 and diode D5 are the 1st pin to resistance R10 and earth leakage protective device LW54123 and the diode of the 2nd pin voltage stabilizing; electric capacity C2, electric capacity C4 and electric capacity C5 are filter capacitors, and resistance R6, resistance R7, resistance R9 and resistance R11 are current-limiting resistance；1st pin of earth leakage protective device LW54123 and the 2nd pin detection senses are to when having the voltage of about 0.7V, the 7th pin output 1V voltage at earth leakage protective device LW54123, then audion Q2 is become conducting state from cut-off state, then the collector voltage of audion Q2 is pulled down to 0V, then audion Q1 is become cut-off state from conducting state, now relay coil KM power-off, then the first normally opened contact KM1 and the second normally opened contact KM2 all disconnects, then alternating current power supply is not the most load supplying, thus protect load, and now bypass circuit 106 constitutes loop, then light emitting diode D2 is illuminating state, as abnormal electric leakage display lamp.
Finally illustrate is, above example is only in order to illustrate the technical solution of the utility model and unrestricted, although this utility model being described in detail with reference to preferred embodiment, it will be understood by those within the art that, the technical solution of the utility model can be modified or equivalent, without deviating from objective and the scope of technical solutions of the utility model, it all should be contained in the middle of right of the present utility model.
Claims (7)
1. a leakage protection circuit, it is characterised in that: including: alternating current power supply, control circuit, on-off circuit, electric-leakage detection circuit, reset circuit, bypass circuit, leakage tests circuit, current transformer and load；
Described alternating current power supply is connected with the input of described control circuit, the outfan of described control circuit is connected with the input of described on-off circuit, first outfan of described on-off circuit and the second outfan are connected with described load after described current transformer, two inputs of described electric-leakage detection circuit two ends with the secondary coil of described current transformer respectively are connected, the outfan of described electric-leakage detection circuit is connected with the input of described control circuit, described bypass circuit is connected with described alternating current power supply, described reset circuit is connected with described electric-leakage detection circuit, described leakage tests circuit is connected with the two ends of the primary coil of described current transformer.
nullA kind of leakage protection circuit the most according to claim 1，It is characterized in that: described control circuit includes: diode D1、Resistance R1、Resistance R2、Resistance R3、Electric capacity C1、Audion Q1 and electric bridge DR，The positive pole of described diode D1 is connected with the live wire end of described alternating current power supply，The negative pole of described diode D1 is by the resistance R1 being sequentially connected in series、Resistance R2 and resistance R3 is connected with the base stage of described audion Q1，The colelctor electrode of described audion Q1 is connected with first end of described electric bridge DR，Second end of described electric bridge DR is connected with the zero line side of described alternating current power supply，One end of described electric capacity C1 is connected with the base stage of described audion Q1，The other end of described electric capacity C1、3rd end of described electric bridge DR、The equal ground connection of emitter stage of described audion Q1，The positive pole of described diode D1 is as the input of described control circuit，4th end of described electric bridge DR is as the outfan of described control circuit.
nullA kind of leakage protection circuit the most according to claim 2，It is characterized in that: described on-off circuit includes: relay coil KM、First normally opened contact KM1 of relay、Second normally opened contact KM2 of relay、Resistance R4、Resistance R5 and light emitting diode D2，One end of described relay coil KM is connected with the live wire end of described alternating current power supply，The other end of described relay coil KM is connected with one end of described resistance R4，The other end of described resistance R4 is connected with the positive pole of described light emitting diode D2，The negative pole of described light emitting diode D2 is connected by second end of described resistance R5 and described electric bridge DR，Described one end of first normally opened contact KM1 is connected with the live wire end of described alternating current power supply，The other end of described first normally opened contact KM1 passes described current transformer T1，Fire wire output end as described alternating current power supply，Described one end of second normally opened contact KM2 is connected with the zero line side of described alternating current power supply，The other end of described second normally opened contact KM2 passes described D.C mutual-inductor T1，Zero line side as described alternating current power supply connects，One end of described relay coil KM is as the input of described on-off circuit，The other end of described first normally opened contact KM1 is as the first outfan of described on-off circuit，The other end of described second normally opened contact KM2 is as the second outfan of described on-off circuit.
nullA kind of leakage protection circuit the most according to claim 3，It is characterized in that: described electric-leakage detection circuit includes earth leakage protective device LW54123、Audion Q2、Resistance R6、Resistance R7、Resistance R8、Resistance R9、Resistance R10、Resistance R11、Electric capacity C2、Electric capacity C3、Electric capacity C4、Electric capacity C5、Electric capacity C6、Electric capacity C7、Diode D3、Diode D4 and diode D5，1st pin of described earth leakage protective device LW54123 is connected with one end of described resistance R6，The other end of described resistance R6 is connected with one end of the secondary coil of described current transformer T1，And resistance R7 in parallel and electric capacity C2 ground connection，6th pin of described earth leakage protective device LW54123 is connected by the base stage of described electric capacity C3 with described audion Q2，The colelctor electrode of described audion Q2 is connected with the base stage of described audion Q1，One end that 8th pin of described earth leakage protective device LW54123 is connected with described resistance R2 and described resistance R3 by resistance R8 connects，2nd pin of described earth leakage protective device LW54123 is connected with the other end of the secondary coil of described current transformer by resistance R9，Described resistance R10 is in parallel with the two ends of the secondary coil of described current transformer，The positive pole of described diode D3 is connected with one end of the secondary coil of described current transformer，The negative pole of described diode D3 is connected with the other end of the secondary coil of described current transformer，The positive pole of described diode D4 is connected with the other end of the secondary coil of described current transformer，The negative pole of described diode D4 is connected with the positive pole of described diode D5，The negative pole of described diode D5 is connected with one end of the secondary coil of described current transformer，One end of described resistance R11 is connected with the 2nd pin of described earth leakage protective device LW54123，The other end of described resistance R11 one end with the negative pole of described diode D4 and described electric capacity C4 respectively is connected，The other end of described electric capacity C4 is connected with one end of the secondary coil of described current transformer，One end of described electric capacity C5 is connected with the 2nd pin of described earth leakage protective device LW54123，The other end of described electric capacity C5 is connected with one end of the secondary coil of described current transformer，5th pin of described earth leakage protective device LW54123 the 4th pin and described earth leakage protective device LW54123 is all by described electric capacity C6 ground connection，7th pin of described earth leakage protective device LW54123 passes through described electric capacity C7 ground connection，The 3rd pin ground connection of described earth leakage protective device LW54123，The two ends of the secondary coil of described current transformer are as the input of described electric-leakage detection circuit，8th pin of described earth leakage protective device LW54123 is as the outfan of described electric-leakage detection circuit.
A kind of leakage protection circuit the most according to claim 4; it is characterized in that: described leakage tests circuit includes: resistance R12 and button K1; one end of described resistance R12 is connected with one end of the primary coil of described current transformer T1, and the other end of described resistance R12 is connected with the other end of the primary coil of described current transformer T1 by described button K1.
A kind of leakage protection circuit the most according to claim 5; it is characterized in that; described reset circuit includes: button K2, electrochemical capacitor C9 and electric capacity C8; one end of described button K2 is connected with the 8th pin of described earth leakage protective device LW54123; the other end ground connection of described button K2; one end that the positive pole of described electrochemical capacitor C9 is connected with described resistance R2 and described resistance R3 connects; the other end ground connection of described electrochemical capacitor C9; one end of described electric capacity C8 is connected with the 8th pin of described earth leakage protective device LW54123, the other end ground connection of described electric capacity C8.
7. according to a kind of leakage protection circuit described in any one of claim 1-6, it is characterized in that: described bypass circuit includes: varistor ZNR1, varistor ZNR2, electric fuse TF and light emitting diode D6, one end of described electric fuse TF is connected with the live wire end of described alternating current power supply, one end of the other end of the described electric fuse TF described varistor ZNR1 by being sequentially connected in series connects, the other end of described varistor ZNR1 is connected by the positive pole of described varistor NSR2 and described light emitting diode D6, the negative pole of described light emitting diode D6 is connected with the ground wire of described alternating current power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620011844.0U CN205489453U (en) | 2016-01-04 | 2016-01-04 | Leakage protective circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620011844.0U CN205489453U (en) | 2016-01-04 | 2016-01-04 | Leakage protective circuit |
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| CN205489453U true CN205489453U (en) | 2016-08-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107453322A (en) * | 2017-10-10 | 2017-12-08 | 沈阳市中兴防爆电器总厂有限公司 | A kind of explosion-proof controlling switch of local strange land double reset test self-insurance electric leakage |
| CN109390906A (en) * | 2017-08-02 | 2019-02-26 | 惠而浦（中国）股份有限公司 | Household appliance leakage protection circuit |
-
2016
- 2016-01-04 CN CN201620011844.0U patent/CN205489453U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109390906A (en) * | 2017-08-02 | 2019-02-26 | 惠而浦（中国）股份有限公司 | Household appliance leakage protection circuit |
| CN109390906B (en) * | 2017-08-02 | 2024-02-09 | 惠而浦（中国）股份有限公司 | Leakage protection circuit for household appliances |
| CN107453322A (en) * | 2017-10-10 | 2017-12-08 | 沈阳市中兴防爆电器总厂有限公司 | A kind of explosion-proof controlling switch of local strange land double reset test self-insurance electric leakage |
| CN107453322B (en) * | 2017-10-10 | 2019-12-24 | 沈阳市中兴防爆电器总厂有限公司 | Local-remote dual reset-test self-protection electric leakage explosion-proof control switch |
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