Dipolar on-off leakage protector

Abstract

The invention relates to a dipolar on-off leakage protector, which comprises a first direct-current rectifying circuit, a second direct-current rectifying circuit, a leakage switching circuit, a leakage driving amplifying circuit and a leakage sensing circuit, the power supply is characterized by further comprising a common-mode and differential-mode filter circuit, the common-mode and differential-mode filter circuit is electrically connected between the live wire L and the null line N of the commercial alternating current and effectively filters common-mode and differential-mode interference signals on the live wire L and the null line N of the commercial alternating current and fed back by the load, and the output end of the common-mode and differential-mode filter circuit is the output end of the commercial alternating current. The leakage protection circuit has the advantages that interference of common-mode signals and differential-mode signals fed back by a power grid and a load can be effectively filtered out, interference of the common-mode signals and the differential-mode signals on the leakage protection circuit is greatly reduced, work is stable, and the leakage protection effect is ideal.

Description

Technical Field

[0001] The present invention relates to a two-pole on-off leakage protector. Background Art

[0002] At present, there are various leakage protectors. For example, the patent is ZL2024200164369, and the name is "AC leakage protection circuit", which includes an AC line L, an AC line N, a control switch K, a zero-sequence current transformer, an anti-interference module connected to the zero-sequence current transformer, a filter voltage stabilization module connected to the anti-interference module, a leakage protection chip module connected to the filter voltage stabilization module, and a control drive module connected to the AC line L and the AC line N; a stabilizing device is also connected between the leakage protection chip module and the filter voltage stabilization module, and the control drive module is also connected to the leakage protection chip module. The control drive module controls the on-off of the control switch K by outputting a control signal from the leakage protection chip module. Although it can play a role in leakage protection, it is vulnerable to interference from the power grid and the load, the work is unstable, and the leakage protection effect is not ideal. Summary of the Invention

[0003] The object of the present invention is to overcome the deficiencies of the prior art and provide a two-pole on-off leakage protector, which can effectively filter out the common-mode signal and differential-mode signal interference fed back from the power grid and the load, greatly reduce the interference of the common-mode signal and differential-mode signal on the present invention, the work is stable, and the leakage protection effect is ideal.

[0004] To achieve the above object, the present invention is realized as follows. It is a two-pole on-off leakage protector, including a first DC rectification circuit, a second DC rectification circuit, a leakage switch circuit, a leakage drive amplification circuit, and a leakage induction circuit; the input ends of the first DC rectification circuit and the second DC rectification circuit are both connected to the commercial AC power supply. The first DC rectification circuit provides a DC working voltage for the leakage switch circuit, and the second DC rectification circuit provides a DC working voltage for the leakage drive amplification circuit. After the leakage induction circuit senses the leakage signal of the live wire L or the neutral wire N of the commercial AC power supply, the sensed leakage signal is input to the leakage drive amplification circuit for amplification. The leakage drive amplification circuit inputs the amplified leakage signal to the leakage switch circuit, and the leakage switch circuit disconnects the live wire L and the neutral wire N of the commercial AC power supply after receiving the leakage signal; it is characterized in that it further includes a common-mode and differential-mode filter circuit, and the common-mode and differential-mode filter circuit is electrically connected between the live wire L and the neutral wire N of the commercial AC power supply to effectively filter out the common-mode and differential-mode interference signals on the live wire L and the neutral wire N of the commercial AC power supply and the load feedback. The output end of the common-mode and differential-mode filter circuit is the output end of the commercial AC power supply.

[0005] In this technical solution, the leakage switch circuit includes a tripping coil and a reset switch; the tripping coil has two normally open contacts, one of the normally open contacts is electrically connected to the live wire L of the mains alternating current, and the other normally open contact is electrically connected to the neutral wire N of the mains alternating current. The reset switch can manually control the two normally open contacts of the tripping coil to be closed and conduct; the leakage induction circuit includes a leakage induction coil, and the output ends of the two normally open contacts of the tripping coil pass through the leakage induction coil; the common-mode and differential-mode filtering circuit includes a first X capacitor, a second X capacitor, a ninth resistor and a common-mode inductor; the output ends of the two normally open contacts of the tripping coil passing through the leakage induction coil are respectively electrically connected to both ends of the first X capacitor and both input ends of the common-mode inductor. The two ends of the second X capacitor and the ninth resistor in parallel are electrically connected to both output ends of the common-mode inductor, and both output ends of the common-mode inductor are the output ends of the mains alternating current.

[0006] In this technical solution, the leakage switch circuit further includes a first thyristor, a second thyristor, resistors from the eleventh to the fifteenth, diodes from the fourth to the seventh, and a sixth capacitor; the first DC rectification circuit includes a first rectification diode and a varistor; the varistor is electrically connected between the live wire L and the neutral wire N of the mains alternating current. The anode of the first rectification diode is electrically connected to the live wire L of the mains alternating current, the cathode of the first rectification diode is electrically connected to one end of the tripping coil, and the other end of the tripping coil is respectively electrically connected to the anode of the first thyristor, one end of the thirteenth resistor, and the cathode of the sixth diode. The cathode of the first thyristor is electrically connected to the anode of the second thyristor. One end of the fourth diode and the eleventh resistor in series is respectively electrically connected to one end of the fourteenth resistor, the control electrode of the second thyristor, and one end of the sixth capacitor. The cathode of the second thyristor and the other end of the sixth capacitor are both grounded. One end of the fifteenth resistor and the seventh diode in series is electrically connected to the other end of the fourteenth resistor. The cathode of the seventh diode is respectively electrically connected to the control electrode of the first thyristor and one end of the twelfth resistor. The twelfth resistor is in series with the fifth diode. The anodes of the fourth to sixth diodes and the other end of the thirteenth resistor are respectively electrically connected to the output end of the leakage drive and amplification circuit.

[0007] In this technical solution, the leakage drive amplification circuit includes a leakage protection chip, a light-emitting diode, a seventh resistor, and a tenth resistor; the leakage induction circuit further includes a fourth resistor to a sixth resistor and a third capacitor to a fifth capacitor; the model of the leakage protection chip is the US standard FM2159, which has a total of fourteen pins. Among them, pin 1 is electrically connected to an output terminal of the leakage induction coil through the fourth resistor, and pin 4 is electrically connected to the other output terminal of the leakage induction coil through the fifth resistor. The sixth resistor (R6) and the fifth capacitor are both electrically connected between pin 1 and pin 4. One end of the third capacitor is electrically connected to pin 1, the other end is grounded and electrically connected to one end of the fourth capacitor, and the other end of the fourth capacitor is electrically connected to pin 4; the seventh resistor is electrically connected between pin 2 and pin 3, pin 5 and pin 6 are both grounded, pin 7 is electrically connected to a DC power output terminal of the second DC rectification circuit, pin 8 is respectively electrically connected to the anode of the sixth diode and the other end of the thirteenth resistor, pin 9 is respectively electrically connected to the anodes of the fourth diode and the fifth diode, pin 11 is grounded through the tenth resistor and the light-emitting diode, pin 12 is electrically connected to the other DC power output terminal of the second DC rectification circuit, and pin 13 is respectively electrically connected to the other end of the fourteenth resistor and one end of the fifteenth resistor.

[0008] In this technical solution, the second DC rectification circuit includes a bridge rectification circuit, a first fuse, a second fuse, a second resistor, a third resistor, a first capacitor, a second capacitor, a second rectifying diode, and a third rectifying diode; one end of the first fuse is respectively electrically connected to one end of the second resistor and connected to the live wire L of the mains AC, and the other end of the first fuse is electrically connected to an input terminal of the bridge rectification circuit. One end of the second fuse is respectively electrically connected to the other input terminal of the bridge rectification circuit and the cathode of the third rectifying diode and connected to the neutral wire N of the mains AC. The other end of the second resistor is electrically connected to the anode of the second rectifying diode, and the cathode of the second rectifying diode is respectively electrically connected to pin 7 of the leakage protection chip and one end of the second capacitor. One end of the third resistor is electrically connected to an output terminal of the bridge rectification circuit, and the other end of the third resistor is respectively electrically connected to pin 12 of the leakage protection chip and one end of the first capacitor. The other end of the first capacitor, the other end of the second capacitor, the anode of the third rectifying diode, and the other output terminal of the bridge rectification circuit are all grounded.

[0009] The advantages of the present invention compared with the prior art are as follows: it can effectively filter out the common-mode signal and differential-mode signal interference on the power grid and load feedback, greatly reducing the interference of the common-mode signal and differential-mode signal to the present invention, with stable operation and ideal leakage protection effect. Description of the Drawings

[0010] Figure 1 is the circuit schematic diagram of Embodiment 1 of the present invention; Figure 2It is the circuit schematic diagram of the second embodiment of the present invention. Detailed implementation manners

[0011] The following further describes the detailed implementation manners of the present invention in conjunction with the accompanying drawings. It should be noted here that the descriptions of these implementation manners are used to help understand the present invention, but do not constitute a limitation to the present invention. In addition, the technical features involved in the various implementation manners of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0012] In the description of the present invention, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Embodiment

[0013] As Figure 1 shown, it is a two-pole on-off leakage protector, including a first DC rectification circuit 1, a second DC rectification circuit 2, a leakage switch circuit 3, a leakage drive amplification circuit 4, a leakage induction circuit 5, a common-mode and differential-mode filtering circuit 6, and a self-checking circuit 7; the input ends of the first DC rectification circuit 1 and the second DC rectification circuit 2 are both connected to the commercial alternating current. The first DC rectification circuit 1 provides a DC working voltage for the leakage switch circuit 3, and the second DC rectification circuit 2 provides a DC working voltage for the leakage drive amplification circuit 4. After the leakage induction circuit 5 senses the leakage signal of the live wire L or the neutral wire N of the commercial alternating current, it inputs the sensed leakage signal to the leakage drive amplification circuit 4 for amplification. The leakage drive amplification circuit 4 inputs the amplified leakage signal to the leakage switch circuit 3. After receiving the leakage signal, the leakage switch circuit 3 disconnects the live wire L and the neutral wire N of the commercial alternating current; the common-mode and differential-mode filtering circuit 6 is electrically connected between the live wire L and the neutral wire N of the commercial alternating current to effectively filter out the common-mode and differential-mode interference signals on the live wire L and the neutral wire N of the commercial alternating current and the load feedback. The output end of the common-mode and differential-mode filtering circuit 6 is the output end of the commercial alternating current, avoiding the influence of the common-mode and differential-mode interference signals on the present invention and making the present invention work more stably and reliably; the self-checking circuit 7 receives the self-checking signal of the leakage drive amplification circuit 4. The leakage induction circuit 5 can sense the self-checking signal output by the self-checking circuit 7 and input the self-checking signal to the leakage drive amplification circuit 4 for amplification to achieve the purpose of self-checking.

[0014] In this embodiment, the leakage switch circuit 3 includes a trip coil RELAY and a reset switch REST; the trip coil RELAY has two normally open contacts, one of which is electrically connected to the live wire L of the mains AC power supply, and the other is electrically connected to the neutral wire N of the mains AC power supply. The reset switch REST can manually control the two normally open contacts of the trip coil RELAY to be closed and conducting; the leakage induction circuit 5 includes a leakage induction coil ZCT, and the output ends of the two normally open contacts of the trip coil RELAY pass through the leakage induction coil ZCT; the common mode and differential mode filtering circuit 6 includes a first X capacitor CX1, a second X capacitor CX2, a ninth resistor R9 and a common mode inductor LF; the output ends of the two normally open contacts of the trip coil RELAY passing through the leakage induction coil ZCT are respectively electrically connected to both ends of the first X capacitor CX1 and both input ends of the common mode inductor LF, and both ends of the second X capacitor CX2 and the ninth resistor R9 in parallel are electrically connected to both output ends of the common mode inductor LF, and both output ends of the common mode inductor LF are the output ends of the mains AC power supply. During operation, when there are common mode and differential mode interference signals on the live wire L and the neutral wire N of the mains AC power supply, the filtering circuit composed of the first X capacitor CX1, the second X capacitor CX2, the ninth resistor R9 and the common mode inductor LF can filter out the common mode and differential mode interference signals. When there are common mode and differential mode interference signals fed back by the load, the filtering circuit composed of the first X capacitor CX1, the second X capacitor CX2, the ninth resistor R9 and the common mode inductor LF can also filter out the common mode and differential mode interference signals, making the operation of the present invention more stable and reliable.

[0015] In this embodiment, the leakage switch circuit 3 further includes a first thyristor Q1, a second thyristor Q2, an eleventh resistor R11 to a fifteenth resistor R15, a fourth diode D4 to a seventh diode D7, and a sixth capacitor C6; the first DC rectifier circuit 1 includes a first rectifier diode D1 and a varistor MOV; the varistor MOV is electrically connected between the live wire L and the neutral wire N of the mains AC power supply. The anode of the first rectifier diode D1 is electrically connected to the live wire L of the mains AC power supply. The cathode of the first rectifier diode D1 is electrically connected to one end of the trip coil RELAY. The other end of the trip coil RELAY is respectively electrically connected to the anode of the first thyristor Q1, one end of the thirteenth resistor R13, and the cathode of the sixth diode D6. The cathode of the first thyristor Q1 is electrically connected to the anode of the second thyristor Q2. One end of the series connection of the fourth diode D4 and the eleventh resistor R11 is respectively electrically connected to one end of the fourteenth resistor R14, the control electrode of the second thyristor Q2, and one end of the sixth capacitor C6. The cathode of the second thyristor Q2 and the other end of the sixth capacitor C6 are both grounded. One end of the series connection of the fifteenth resistor R15 and the seventh diode D7 is electrically connected to the other end of the fourteenth resistor R14. The cathode of the seventh diode D7 is respectively electrically connected to the control electrode of the first thyristor Q1 and one end of the twelfth resistor R12. The twelfth resistor R12 is connected in series with the fifth diode D5. The anodes of the fourth diode D4 to the sixth diode D6 and the other end of the thirteenth resistor R13 are respectively electrically connected to the output end of the leakage drive amplifier circuit 4.

[0016] In this embodiment, the leakage drive amplifier circuit 4 includes a leakage protection chip U, a light-emitting diode LED, a seventh resistor R7, and a tenth resistor R10; the leakage induction circuit 5 further includes a fourth resistor R4 to a sixth resistor R6 and a third capacitor C3 to a fifth capacitor C5; the self-checking circuit 7 includes an eighth resistor R8, a thirteenth resistor R13, a triode Q, and an eighth diode D8; the model of the leakage protection chip U is the US standard FM2159, which has a total of fourteen pins. Among them, pin 1 is electrically connected to an output end of the leakage induction coil ZCT through the fourth resistor R4, and pin 4 is electrically connected to the other output end of the leakage induction coil ZCT through the fifth resistor R5. The sixth resistor R6 and the fifth capacitor C5 are both electrically connected between pin 1 and pin 4. One end of the third capacitor C3 is electrically connected to pin 1, the other end is grounded and electrically connected to one end of the fourth capacitor C4, and the other end of the fourth capacitor C4 is electrically connected to pin 4; the seventh resistor R7 is electrically connected between pin 2 and pin 3, pins 5 and 6 are both grounded, pin 7 is electrically connected to a DC power output end of the second DC rectification circuit 2, pin 8 is respectively electrically connected to the anode of the sixth diode D6 and the other end of the thirteenth resistor R13, pin 9 is respectively electrically connected to the anode of the fourth diode D4 and the anode of the fifth diode D5, pin 10 is electrically connected to the base of the triode Q through the thirteenth resistor R13, pin 11 is grounded through the tenth resistor R10 and the light-emitting diode LED, pin 12 is electrically connected to the other DC power output end of the second DC rectification circuit 2, pin 13 is respectively electrically connected to the other end of the fourteenth resistor R14 and one end of the fifteenth resistor R15. The emitter of the triode Q is grounded, and the leakage induction coil ZCT is sleeved on the grounding wire of the emitter of the triode Q. The eighth diode D8 and the eighth resistor R8 are connected in series, and one end is electrically connected to the collector of the triode Q. The anode of the eighth diode D8 is electrically connected to the neutral line N of the commercial alternating current. In order to test the present invention, the leakage induction circuit 5 further includes a test switch KEY and a first resistor R1. One end of the test switch KEY and the first resistor R1 connected in series is electrically connected to the live wire L of the commercial alternating current passing through the leakage induction coil ZCT, and the other end is connected to the neutral line N of the alternating current.

[0017] In this embodiment, the second DC rectification circuit 2 includes a bridge rectification circuit DB, a first fuse F1, a second fuse F2, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, a second rectifier diode D2, and a third rectifier diode D3; one end of the first fuse F1 is electrically connected to one end of the second resistor R2 and connected to the live wire L of the mains alternating current, and the other end of the first fuse F1 is electrically connected to an input terminal of the bridge rectification circuit DB. One end of the second fuse F2 is electrically connected to the other input terminal of the bridge rectification circuit DB and the cathode of the third rectifier diode D3 and connected to the neutral wire N of the mains alternating current. The other end of the second resistor R2 is electrically connected to the anode of the second rectifier diode D2. The cathode of the second rectifier diode D2 is electrically connected to pin 7 of the leakage protection chip U and one end of the second capacitor C2. One end of the third resistor R3 is electrically connected to an output terminal of the bridge rectification circuit DB, and the other end of the third resistor R3 is electrically connected to pin 12 of the leakage protection chip U and one end of the first capacitor C1. The other end of the first capacitor C1, the other end of the second capacitor C2, the anode of the third rectifier diode D3, and the other output terminal of the bridge rectification circuit DB are all grounded.

[0018] Connect the mains alternating current. At this time, the mains alternating current supplies power to the first DC rectification circuit 1 and the second DC rectification circuit 2; when working normally, there is no leakage signal on the live wire L and the neutral wire N passing through the induction coil ZCT, the induction coil ZCT does not output a leakage signal, and the leakage protection chip U also does not output a leakage signal. The first thyristor Q1 and the second thyristor Q2 are both turned off. The mains alternating current supplies operating voltage to the first thyristor Q1 and the second thyristor Q2 through the first rectifier diode D1 and the trip coil RELAY. The other end of the third resistor R3 and the cathode of the second rectifier diode D2 supply operating voltage to the leakage protection chip U respectively, and the light-emitting diode LED lights up, indicating that the leakage protection chip U is working normally; when there is a leakage signal, when there is a leakage signal on the live wire L or the neutral wire N of the induction coil ZCT, the leakage protection chip U receives the leakage signal output by the induction coil ZCT at pin 1 and pin 4. After being amplified and processed by the leakage protection chip U, the leakage signal is output at pin 9 and pin 13 to the control electrodes of the first thyristor Q1 and the second thyristor Q2. The first thyristor Q1 and the second thyristor Q2 are short-circuited, and the trip coil RELAY obtains a larger current. The magnetic field generated by this current drives the two normally open contacts of the closed trip coil RELAY to disconnect, playing a role in leakage protection. When there are common-mode and differential-mode interference signals on the mains power grid, or when there are common-mode and differential-mode interference signal feedbacks on the load, the filter circuit composed of the first X capacitor CX1, the second X capacitor CX2, the ninth resistor R9, and the common-mode inductor LF can effectively filter out the common-mode and differential-mode interference signals, greatly reducing the interference to the present invention, making its operation more stable and the leakage protection effect better. Embodiment

[0019] As Figure 2 shown, its technical solution and working principle are basically the same as those of the first embodiment. In order to make the present invention work more stably and reliably, the ninth resistor R9 in the first embodiment is composed of the ninety-first resistor R91 to the ninety-sixth resistor R96 connected in series and parallel in the second embodiment.

[0020] The above has made a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For those of ordinary skill in the art, various changes, modifications, substitutions and variations of these embodiments still fall within the protection scope of the present invention without departing from the principle and purpose of the present invention.

Claims

1. A two-pole on-off leakage protector, comprising a first DC rectifier circuit (1), a second DC rectifier circuit (2), a leakage switch circuit (3), a leakage drive amplifier circuit (4) and a leakage sensing circuit (5); the input ends of the first DC rectifier circuit (1) and the second DC rectifier circuit (2) are both connected to AC power; the first DC rectifier circuit (1) provides a DC working voltage for the leakage switch circuit (3); the second DC rectifier circuit (2) provides a DC working voltage for the leakage drive amplifier circuit (4); the leakage sensing circuit (5) senses a leakage signal of a live wire L or a neutral wire N of AC power and inputs the sensed leakage signal to the leakage drive amplifier circuit (4) for amplification; the leakage drive amplifier circuit (4) inputs the amplified leakage signal to the leakage switch circuit (3); the leakage switch circuit (3) disconnects the live wire L and the neutral wire N of AC power after receiving the leakage signal; characterized in that It also includes a common-mode and differential-mode filtering circuit (6), which is electrically connected between the live wire L and the neutral wire N of the AC mains to effectively filter out common-mode and differential-mode interference signals on the live wire L and the neutral wire N of the AC mains and fed back by the load, and the output end of the common-mode and differential-mode filtering circuit (6) is the output end of the AC mains.

2. The two-pole on-off leakage protector according to claim 1 is characterized in that The leakage switch circuit (3) comprises a trip coil (RELAY) and a reset switch (REST); the trip coil (RELAY) has two normally open contacts, one of which is electrically connected to the live wire L of the AC mains, and the other is electrically connected to the neutral wire N of the AC mains, and the reset switch (REST) ​​can manually control the two normally open contacts of the trip coil (RELAY) to close and conduct; the leakage induction circuit (5) comprises a leakage induction coil (ZCT), and the output ends of the two normally open contacts of the trip coil (RELAY) pass through the leakage induction coil (ZCT). CT); the common-mode and differential-mode filtering circuit (6) comprises a first X capacitor (CX1), a second X capacitor (CX2), a ninth resistor (R9) and a common-mode inductor (LF); the output ends of the two normally open contacts of the tripping coil (RELAY) passing through the leakage induction coil (ZCT) are respectively electrically connected to the two ends of the first X capacitor (CX1) and the two input ends of the common-mode inductor (LF); the two ends of the second X capacitor (CX2) and the ninth resistor (R9) after being connected in parallel are electrically connected to the two output ends of the common-mode inductor (LF); and the two output ends of the common-mode inductor (LF) are the output ends of the AC power.

3. The two-pole on-off leakage protector according to claim 2 is characterized in that The leakage switch circuit (3) further comprises a first thyristor (Q1), a second thyristor (Q2), an eleventh resistor (R11) to a fifteenth resistor (R15), a fourth diode (D4) to a seventh diode (D7) and a sixth capacitor (C6); the first DC rectifier circuit (1) comprises a first rectifier diode (D1) and a varistor (MOV); the varistor (MOV) is electrically connected between a live wire L and a neutral wire N of the AC mains, an anode of the first rectifier diode (D1) is electrically connected to the live wire L of the AC mains, a cathode of the first rectifier diode (D1) is electrically connected to one end of a trip coil (RELAY), the other end of the trip coil (RELAY) is electrically connected to the anode of the first thyristor (Q1), one end of a thirteenth resistor (R13) and the cathode of the sixth diode (D6), respectively, and the cathode of the first thyristor (Q1) is electrically connected to the neutral wire N of the AC mains. The anode of the second thyristor (Q2) is electrically connected, the fourth diode (D4) and the eleventh resistor (R11) are connected in series, and one end is electrically connected to one end of the fourteenth resistor (R14), the control electrode of the second thyristor (Q2) and one end of the sixth capacitor (C6), the cathode of the second thyristor (Q2) and the other end of the sixth capacitor (C6) are both grounded, the fifteenth resistor (R15) and the seventh diode (D7) are connected in series, and one end is electrically connected to the other end of the fourteenth resistor (R14), the cathode of the seventh diode (D7) is electrically connected to the control electrode of the first thyristor (Q1) and one end of the twelfth resistor (R12), the twelfth resistor (R12) is connected in series with the fifth diode (D5), and the anodes of the fourth diode (D4) to the sixth diode (D6) and the other end of the thirteenth resistor (R13) are electrically connected to the output end of the leakage drive amplifier circuit (4).

4. The two-pole on-off leakage protector according to claim 2 or 3, characterized in that The leakage driving amplifier circuit (4) comprises a leakage protection chip (U), a light emitting diode (LED), a seventh resistor (R7) and a tenth resistor (R10); the leakage sensing circuit (5) further comprises a fourth resistor (R4) to a sixth resistor (R6) and a third capacitor (C3) to a fifth capacitor (C5); the model of the leakage protection chip (U) is American standard FM2159, with a total of fourteen pins, wherein pin 1 is electrically connected to an output end of the leakage sensing coil (ZCT) through the fourth resistor (R4), pin 4 is electrically connected to the other output end of the leakage sensing coil (ZCT) through the fifth resistor (R5), the sixth resistor (R6) and the fifth capacitor (C5) are both electrically connected between pin 1 and pin 4, one end of the third capacitor (C3) is electrically connected to pin 1, and the other end The first terminal (R10) is electrically connected to the first pin (D11) and the second pin (D5) is electrically connected to the first pin (D12). The first terminal (R10) is electrically connected to the first pin (D13). The second terminal (R11) is electrically connected to the first pin (D14). The first terminal (R11) is electrically connected to the first pin (D15). The first terminal (R11) is electrically connected to the first pin (D10) and the second pin (D5). The first terminal (R11) is electrically connected to the first pin (D11). The first terminal (R11) is electrically connected to the first pin (D12). The first terminal (R11) is electrically connected to the first pin (D13). The first terminal (R11) is electrically connected to the first pin (D14). The first terminal (R11) is electrically connected to the first pin (D15).

5. The two-pole on-off leakage protector according to claim 4 is characterized in that The second DC rectifier circuit (2) comprises a bridge rectifier circuit (DB), a first fuse (F1), a second fuse (F2), a second resistor (R2), a third resistor (R3), a first capacitor (C1), a second capacitor (C2), a second rectifier diode (D2) and a third rectifier diode (D3); one end of the first fuse (F1) is electrically connected to one end of the second resistor (R2) and connected to a live wire L of the AC power, the other end of the first fuse (F1) is electrically connected to an input end of the bridge rectifier circuit (DB), and one end of the second fuse (F2) is electrically connected to the other input end of the bridge rectifier circuit (DB) and the cathode of the third rectifier diode (D3). The circuit is connected to a neutral line N of the AC mains, the other end of the second resistor (R2) is electrically connected to the anode of the second rectifier diode (D2), the cathode of the second rectifier diode (D2) is electrically connected to the pin 7 of the leakage protection chip (U) and one end of the second capacitor (C2), one end of the third resistor (R3) is electrically connected to an output end of the bridge rectifier circuit (DB), the other end of the third resistor (R3) is electrically connected to the pin 12 of the leakage protection chip (U) and one end of the first capacitor (C1), the other end of the first capacitor (C1), the other end of the second capacitor (C2), the anode of the third rectifier diode (D3) and the other output end of the bridge rectifier circuit (DB) are all grounded.

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