Leakage protection plug circuit
By designing a leakage protection plug circuit containing multiple functional modules, the problem of self-detection of leakage function in the prior art cannot be performed in the power supply state, efficient leakage detection and self-detection are achieved, and the leakage protection efficiency and safety of the plug are improved.
Patent Information
- Application Number
- CN202421869706.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-05
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-08-05
AI Technical Summary
When the existing leakage protection plug is self-detected for leakage function, it cannot be detected during power supply operation, resulting in limited self-detecting for leakage function.
A leakage protection plug circuit is designed, including a plug module, a power supply control module, a first switch module, a second switch module, a self-test control module, a leakage judgment module and an output module. Through the coordinated work of these modules, leakage detection and self-test are realized in the power supply state, and power outage protection is carried out when leakage is detected.
It realizes effective leakage detection and self-testing under the power supply state of the leakage protection plug, improves the efficiency and safety of leakage protection, and ensures that the plug can perform power-off protection normally when leakage occurs.
Smart Images
Figure CN222915649U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of leakage protection plugs, in particular to a leakage protection plug circuit. Background Art
[0002] At present, most of the electrical equipment on the market is equipped with a leakage protection plug device to play a role in leakage protection and avoid electric shock accidents caused by human contact with the leakage part. The leakage protection plugs in the prior art generally have a self-detection function for the leakage function, that is, by generating the leakage current required for the experiment, it is judged whether the leakage protection plug can normally perform the leakage protection work. However, when performing the self-detection of the leakage function, the leakage protection plug will stop power supply, and since the leakage detection device used in the leakage protection plug will perform self-locking power-off protection when detecting leakage, only by disconnecting the electric energy of the leakage detection device can it be reset. This makes it impossible to perform the self-detection of the leakage function when the leakage protection plug is in the power supply working state, and the self-detection of the leakage function is restricted, so there is room for improvement. Summary of the Utility Model
[0003] The embodiment of the utility model provides a leakage protection plug circuit to solve the problems raised in the above background art.
[0004] To achieve the above object, the utility model provides the following technical solutions:
[0005] A leakage protection plug circuit includes: a plug module, a power supply control module, a first switch module, a second switch module, a self-check control module, a leakage judgment module and an output module;
[0006] The plug module is used to access AC electric energy, rectify, filter and regulate the AC electric energy and output the first electric energy;
[0007] The power supply control module is connected to the plug module, the first switch module, the second switch module, the self-check control module and the leakage judgment module, and is used to transmit the first electric energy to the first switch module, the second switch module and the leakage judgment module, and stop the transmission work of the first electric energy when receiving the delay control signal output by the second switch module and the second level signal output by the self-check control module;
[0008] The self-check control module is connected to the first switch module, and is used to receive the AC electric energy transmitted by the first switch module and generate an experimental leakage signal and a first level signal, and output a second level signal when no experimental leakage signal is generated;
[0009] A leakage judgment module, connected to the output module and the self-check control module, is configured to receive the first electric energy and perform leakage detection on the AC electric energy input to the output module, and self-lock and output a leakage protection signal when it detects leakage in the output module or detects an experimental leakage signal;
[0010] A first switch module, connected to the plug module, the output module and the leakage judgment module, is configured to transmit AC electric energy to the output module and the self-check control module, and stop transmitting AC electric energy and perform leakage display when it receives the leakage protection signal;
[0011] A second switch module, connected to the plug module, the leakage judgment module and the output module, is configured to output a delay control signal and delay the transmission of AC electric energy to the output module when it receives the first level signal and the leakage protection signal;
[0012] An output module is configured to receive the AC electric energy transmitted by the first switch module or the second switch module and supply power to the connected electrical equipment.
[0013] As a further solution of the present invention: the plug module includes a plug input port, a first varistor, a first rectifier, a first capacitor and a first diode; the first switch module includes a first relay switch; the leakage judgment module includes a first current transformer; the output module includes an output port;
[0014] Preferably, one end of the plug input port is connected to the first end of the first rectifier and the first static end of the first relay switch, and the second end of the plug input port, the second end of the first rectifier and the second static end of the first relay switch are connected through the first varistor. The first moving end and the second moving end of the first relay switch both pass through the center of the first current transformer and are respectively connected to the first end and the second end of the output port. The third end of the first rectifier is connected to one end of the first capacitor, the cathode of the first diode and the power supply control module, and the fourth end of the first rectifier, the other end of the first capacitor and the anode of the first diode are all grounded.
[0015] As a further solution of the present invention: the leakage judgment module further includes a second resistor, a third resistor, a fourth resistor, a third capacitor and a first protector; the first switch module further includes a first relay, a first switch tube, a seventh resistor and a first indicator light;
[0016] Preferably, one end of the second resistor is connected to the first output terminal of the first transformer, and is connected to the second output terminal of the first transformer and one end of the third resistor through the fourth resistor. The other end of the second resistor is connected to the first end of the first protector and is connected to the other end of the third resistor and the second end of the first transformer through the third capacitor. The third end of the first transformer and the emitter of the first switching transistor are both grounded. The seventh end of the first transformer is connected to the base of the first switching transistor. The collector of the first switching transistor is connected to the cathode of the first indicator light and the first end of the first relay. The anode of the first indicator is connected to the second end of the first relay, the eighth end of the first protector and the power supply control module through the seventh resistor.
[0017] As a further solution of the present invention: The self-check control module includes a first push-button switch, a first resistor, a first optocoupler and a fifth resistor;
[0018] Preferably, the moving end of the first push-button switch is connected to the first moving end of the first relay switch. The static end of the first push-button switch is connected to the first end of the first optocoupler through the first resistor. The second end of the first optocoupler passes through the center of the first transformer and is connected to the second end of the output port. The third end of the first optocoupler is connected to the power supply control module. The fourth end of the first optocoupler is grounded through the fifth resistor.
[0019] As a further solution of the present invention: The second switch module includes a first logic chip, a second capacitor, a second switching transistor, a second relay and a second relay switch;
[0020] Preferably, the A end of the first logic chip is connected to the seventh end of the first protector. The B end of the first logic chip is connected to the fourth end of the first optocoupler. The F electric energy of the first logic chip is connected to the base of the second switching transistor and the first end of the second capacitor. The second end of the second capacitor is grounded. The collector of the second switching transistor is connected to the first end of the second relay. The second end of the second relay is connected to the power supply control module. The first moving end and the second moving end of the second relay switch are respectively connected to the first moving end and the second moving end of the first relay switch. The first static end and the second static end of the second relay switch are respectively connected to the first static end and the second static end of the first relay switch.
[0021] As a further solution of the present invention: The power supply control module includes a sixth resistor, a first power transistor, a third switching transistor, a second logic chip and a first inverter;
[0022] Preferably, the gate of the first power transistor is connected to the collector of the third switching transistor and connected to the drain of the first power transistor and the third terminal of the first rectifier through a sixth resistor. The source of the first power transistor is connected to the eighth terminal of the first protector, the second terminal of the second relay, and the third terminal of the first optocoupler. The emitter of the third switching transistor is grounded, and the base of the third switching transistor is connected to the F terminal of the second logic chip. The A terminal of the second logic chip is connected to the first terminal of the second capacitor, the B terminal of the second logic chip is connected to the output terminal of the first inverter, and the input terminal of the first inverter is connected to the fourth terminal of the first optocoupler.
[0023] Compared with the prior art, the beneficial effects of the present utility model are as follows: In the leakage protection plug circuit of the present utility model, the leakage judgment module detects the leakage of the electric energy transmitted from the first switching module to the output module, and controls the first switching module to perform power-off protection in case of leakage. When the self-check control module generates an experimental leakage signal required for the experiment, the leakage judgment module cooperates with the first switching module to perform leakage protection processing, so as to judge whether the leakage protection plug normally performs power-off protection work in case of leakage. At the same time, in order to ensure that the output module can continue to receive electric energy, the second switching module will be used to control the power transmission, and when the leakage self-check work is stopped, the leakage judgment module will be reset to enable the leakage judgment module to continue to perform leakage judgment, thereby improving the leakage protection efficiency and safety of the leakage protection plug. Description of the Drawings
[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments of the present utility model. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0025] Figure 1 It is a schematic block diagram of the principle of a leakage protection plug circuit provided by an embodiment of the present utility model.
[0026] Figure 2 It is a circuit diagram of a leakage protection plug circuit provided by an embodiment of the present utility model.
[0027] Figure 3 It is a connection circuit diagram of a power supply control module provided by an embodiment of the present utility model. Detailed Embodiments
[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0029] In one embodiment, please refer to Figure 1 , a leakage protection plug circuit, comprising: a plug module 1, a power supply control module 2, a first switch module 3, a second switch module 4, a self-check control module 5, a leakage judgment module 6, and an output module 7;
[0030] Specifically, the plug module 1 is used to access AC electrical energy, rectify, filter, and regulate the AC electrical energy and output the first electrical energy;
[0031] The power supply control module 2 is connected to the plug module 1, the first switch module 3, the second switch module 4, the self-check control module 5, and the leakage judgment module 6, and is used to transmit the first electrical energy to the first switch module 3, the second switch module 4, and the leakage judgment module 6, and stop the transmission work of the first electrical energy when receiving the delay control signal output by the second switch module 4 and the second level signal output by the self-check control module 5;
[0032] The self-check control module 5 is connected to the first switch module 3, and is used to receive the AC electrical energy transmitted by the first switch module 3 and generate an experimental leakage signal and a first level signal, and output a second level signal when no experimental leakage signal is generated;
[0033] The leakage judgment module 6 is connected to the output module 7 and the self-check control module 5, and is used to receive the first electrical energy and perform leakage detection on the AC electrical energy input to the output module 7, and self-lock and output a leakage protection signal when detecting leakage of the output module 7 or detecting an experimental leakage signal;
[0034] The first switch module 3 is connected to the plug module 1, the output module 7, and the leakage judgment module 6, and is used to transmit the AC electrical energy to the output module 7 and the self-check control module 5, and stop transmitting the AC electrical energy and perform leakage display when receiving the leakage protection signal;
[0035] The second switch module 4 is connected to the plug module 1, the leakage judgment module 6, and the output module 7, and is used to output a delay control signal and delay the transmission of the AC electrical energy to the output module 7 when receiving the first level signal and the leakage protection signal;
[0036] An output module 7, configured to receive the AC power transmitted by the first switch module 3 or the AC power transmitted by the second switch module 4 and supply power to the connected electrical equipment.
[0037] In a specific embodiment, the above-mentioned plug module 1 may adopt a plug circuit composed of a plug input port, a rectifier, a diode, etc., and can be connected to an AC power supply to access AC power and perform overvoltage protection, rectification filtering, and voltage stabilization processing on the AC power; the above-mentioned power supply control module 2 may adopt a power supply control circuit composed of a resistor, a power transistor, a logic chip, etc., and can control the transmission of electric energy and stop the power transmission work after the self-check control module 5 stops generating an experimental leakage signal; the above-mentioned first switch module 3 may adopt a first switch circuit composed of a relay, an indicator light, a triode, etc., and can control the transmission of AC power, and perform power-off and leakage display after receiving the leakage protection signal output by the leakage judgment module 6; the above-mentioned second switch module 4 may adopt a second switch circuit composed of a relay, a capacitor, a logic chip, etc., and can delay the transmission of AC power to the output module 7 when the self-check control module 5 generates an experimental leakage signal and the leakage judgment module 6 determines that a leakage has occurred; the above-mentioned self-check control module 5 may adopt a self-check control circuit composed of a resistor, a key switch, and an optocoupler, and can generate an experimental leakage signal; the above-mentioned leakage judgment module 6 may adopt a leakage judgment circuit composed of a leakage protection device, a capacitor, a current transformer, etc., and can perform leakage detection on the AC power input to the output module 7 and the experimental leakage signal generated by the self-check control module 5, and output a leakage signal when a leakage occurs; the above-mentioned output module 7 may adopt an output circuit composed of output ports to receive electric energy and connect to electrical equipment.
[0038] In another embodiment, please refer to Figure 1 , Figure 2 and Figure 3 , the plug module 1 includes a plug input port, a first varistor RV1, a first rectifier T1, a first capacitor C1, and a first diode D1; the first switch module 3 includes a first relay switch K1-1; the leakage judgment module 6 includes a first current transformer ZCT; the output module 7 includes an output port;
[0039] Specifically, the plug input port is connected to the first end of the first rectifier T1 and the first static end of the first relay switch K1-1 at one end, and the second end of the plug input port, the second end of the first rectifier T1, and the second static end of the first relay switch K1-1 are connected through the first varistor RV1. The first moving end and the second moving end of the first relay switch K1-1 both pass through the center of the first current transformer ZCT and are respectively connected to the first end and the second end of the output port. The third end of the first rectifier T1 is connected to one end of the first capacitor C1, the cathode of the first diode D1, and the power supply control module 2. The fourth end of the first rectifier T1, the other end of the first capacitor C1, and the anode of the first diode D1 are all grounded.
[0040] In a specific embodiment, the first relay switch K1-1 can be selected as a double-pole double-throw normally-closed switch; the first mutual inductor ZCT can be selected as a current mutual inductor.
[0041] Furthermore, the leakage judgment module 6 further includes a second resistor R2, a third resistor R3, a fourth resistor R4, a third capacitor C3, and a first protector IC1; the first switch module 3 further includes a first relay K1, a first switching transistor V1, a seventh resistor R7, and a first indicator LED1;
[0042] Specifically, one end of the second resistor R2 is connected to the first output terminal of the first mutual inductor ZCT and is connected to the second output terminal of the first mutual inductor ZCT and one end of the third resistor R3 through the fourth resistor R4. The other end of the second resistor R2 is connected to the first end of the first protector IC1 and is connected to the other end of the third resistor R3 and the second end of the first mutual inductor ZCT through the third capacitor C3. The third end of the first mutual inductor ZCT and the emitter of the first switching transistor V1 are both grounded. The seventh end of the first mutual inductor ZCT is connected to the base of the first switching transistor V1. The collector of the first switching transistor V1 is connected to the cathode of the first indicator LED1 and the first end of the first relay K1. The anode of the first indicator is connected to the second end of the first relay K1, the eighth end of the first protector IC1, and the power supply control module 2 through the seventh resistor R7.
[0043] In a specific embodiment, the first protector IC1 can be selected as a VG54123 leakage detection device; the first switching transistor V1 can be selected as an NPN-type triode; the first relay K1 can control the disconnection of the first relay switch K1-1 in a magnetic attraction manner; the first indicator LED1 can be selected as an LED lamp bead for leakage display.
[0044] Furthermore, the self-check control module 5 includes a first push-button switch S1, a first resistor R1, a first optocoupler IC2, and a fifth resistor R5;
[0045] Specifically, the moving end of the first push-button switch S1 is connected to the first moving end of the first relay switch K1-1. The static end of the first push-button switch S1 is connected to the first end of the first optocoupler IC2 through the first resistor R1. The second end of the first optocoupler IC2 passes through the center of the first mutual inductor ZCT and is connected to the second end of the output port. The third end of the first optocoupler IC2 is connected to the power supply control module 2. The fourth end of the first optocoupler IC2 is grounded through the fifth resistor R5.
[0046] In a specific embodiment, the first optocoupler IC2 can be selected as a TLP620 bidirectional optocoupler.
[0047] Further, the second switch module 4 includes a first logic chip J1, a second capacitor C2, a second switching transistor V2, a second relay K2, and a second relay switch K2-1;
[0048] Specifically, the A terminal of the first logic chip J1 is connected to the seventh terminal of the first protector IC1, the B terminal of the first logic chip J1 is connected to the fourth terminal of the first optocoupler IC2, the F power of the first logic chip J1 is connected to the base of the second switching transistor V2 and the first terminal of the second capacitor C2, the second terminal of the second capacitor C2 is grounded, the collector of the second switching transistor V2 is connected to the first terminal of the second relay K2, the second terminal of the second relay K2 is connected to the power supply control module 2, the first moving terminal and the second moving terminal of the second relay switch K2-1 are respectively connected to the first moving terminal and the second moving terminal of the first relay switch K1-1, and the first static terminal and the second static terminal of the second relay switch K2-1 are respectively connected to the first static terminal and the second static terminal of the first relay switch K1-1.
[0049] In a specific embodiment, the above-mentioned first logic chip J1 can be selected as an AND gate chip; the above-mentioned second switching transistor V2 can be selected as an NPN type triode; the above-mentioned second relay switch K2-1 can be selected as a double-pole double-throw normally open switch, and the second relay K2 controls the closing operation of the second relay switch K2-1 by magnetic attraction; the above-mentioned second capacitor C2 can be selected as an energy storage capacitor to store energy and control the second switching transistor V2 to conduct with a time delay.
[0050] Further, the power supply control module 2 includes a sixth resistor R6, a first power transistor Q1, a third switching transistor V3, a second logic chip J2, and a first inverter J3;
[0051] Specifically, the gate of the first power transistor Q1 is connected to the collector of the third switching transistor V3 and is connected to the drain of the first power transistor Q1 and the third terminal of the first rectifier T1 through the sixth resistor R6, the source of the first power transistor Q1 is connected to the eighth terminal of the first protector IC1, the second terminal of the second relay K2, and the third terminal of the first optocoupler IC2, the emitter of the third switching transistor V3 is grounded, the base of the third switching transistor V3 is connected to the F terminal of the second logic chip J2, the A terminal of the second logic chip J2 is connected to the first terminal of the second capacitor C2, the B terminal of the second logic chip J2 is connected to the output terminal of the first inverter J3, and the input terminal of the first inverter J3 is connected to the fourth terminal of the first optocoupler IC2.
[0052] In a specific embodiment, the above-mentioned first power transistor Q1 can be selected as an N-channel field effect transistor; the above-mentioned third switching transistor V3 can be selected as an NPN type triode; the above-mentioned second logic chip J2 can be selected as an AND gate chip, and the first inverter J3 can be selected as a NOT gate chip.
[0053] In the leakage protection plug circuit of this embodiment, the plug input port is connected to the AC power supply to access AC electrical energy. The first varistor RV1 is used for overvoltage protection. The first rectifier T1, the first capacitor C1, and the first diode D1 perform rectification, filtering, and voltage stabilization processing, and transmit the power to the first relay K1, the second relay K2, the first optocoupler IC2, and the first protector IC1 through the first power transistor Q1. When the power transmitted to the output port by the first relay switch K1-1 leaks, the first current transformer ZCT will generate a leakage current. After being converted and filtered by the fourth resistor R4, the second resistor R2, the third resistor R3, and the third capacitor C3, the first protector IC1 receives it. The first protector IC1 determines whether the voltage signal converted from the leakage current exceeds the leakage threshold set inside the first protector IC1. If it exceeds, it is determined that leakage has occurred. The seventh terminal of the first protector IC1 will self-lock and output a leakage protection signal and control the first switching transistor V1 to conduct. The first relay K1 is energized and controls the first relay switch K1-1 to disconnect, performing a power-off operation. The first indicator LED1 displays the leakage. When it is necessary to perform a self-check on the leakage protection operation, the first push-button switch S1 is closed, causing the first optocoupler IC2 to conduct. The first current transformer ZCT generates a leakage current. Similarly, the first protector IC1 will control the first relay switch K1-1 to disconnect, and the first indicator LED1 normally displays the leakage, indicating that the leakage protection is normal. At the same time, the first logic chip J1 will control the second switching transistor V2 to conduct, the second capacitor C2 stores energy, the second relay K2 is energized and controls the second relay switch K2-1 to close, maintaining the power supply from the plug input port to the output port. After the first push-button switch S1 is disconnected, the second capacitor C2 discharges, the first inverter J3 outputs a high level, the second logic chip J2 will control the third switching transistor V3 to conduct, causing the first power transistor Q1 to cut off, stopping the power supply. The first relay switch K1-1 closes, the second relay switch K2-1 disconnects, the first protector IC1 is reset, and after the discharge of the second capacitor C2 ends, the third switching transistor V3 cuts off, the first power transistor Q1 conducts again, and the first protector IC1 resumes leakage detection and leakage protection.
[0054] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.
[0055] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A leakage protection plug circuit, characterized in that: The leakage protection plug circuit comprises: a plug module, a power supply control module, a first switch module, a second switch module, a self-check control module, a leakage judgment module and an output module; The plug module is used to receive AC power, rectify, filter and stabilize the AC power and output the first power; The power supply control module is connected to the plug module, the first switch module, the second switch module, the self-checking control module and the leakage judging module, and is used to transmit the first electric energy to the first switch module, the second switch module and the leakage judging module, and stop the transmission of the first electric energy when receiving the delay control signal output by the second switch module and the second level signal output by the self-checking control module; The self-check control module is connected to the first switch module, and is used to receive the AC power transmitted by the first switch module and generate an experimental leakage signal and a first level signal, and output a second level signal when the experimental leakage signal is not generated; The leakage judgment module is connected to the output module and the self-check control module, and is used to receive the first electric energy and perform leakage detection on the AC electric energy input to the output module, and when leakage is detected in the output module or an experimental leakage signal is detected, the leakage protection signal is outputted in a self-locking manner; The first switch module is connected to the plug module, the output module and the leakage judgment module, and is used to transmit AC power to the output module and the self-check control module, and when receiving the leakage protection signal, stops transmitting AC power and displays leakage; The second switch module is connected to the plug module, the leakage judgment module and the output module, and is used to output a delay control signal and delay the transmission of AC power to the output module when receiving the first level signal and the leakage protection signal; The output module is used to receive the AC power transmitted by the first switch module or the AC power transmitted by the second switch module and supply power to the connected electrical equipment.
2. A leakage protection plug circuit according to claim 1, characterized in that: The plug module includes a plug input port, a first varistor, a first rectifier, a first capacitor and a first diode; the first switch module includes a first relay switch; the leakage judgment module includes a first mutual inductor; the output module includes an output port; The plug input port is connected at one end to the first end of the first rectifier and the first static end of the first relay switch, and is connected to the second end of the plug input port, the second end of the first rectifier and the second static end of the first relay switch through the first varistor. The first moving end and the second moving end of the first relay switch both pass through the center of the first mutual inductor and are respectively connected to the first end and the second end of the output port. The third end of the first rectifier is connected to one end of the first capacitor, the cathode of the first diode and the power supply control module. The fourth end of the first rectifier, the other end of the first capacitor and the anode of the first diode are all grounded.
3. A leakage protection plug circuit according to claim 2, characterized in that: The leakage judgment module also includes a second resistor, a third resistor, a fourth resistor, a third capacitor and a first protector; the first switch module also includes a first relay, a first switch tube, a seventh resistor and a first indicator light; One end of the second resistor is connected to the first output end of the first mutual inductor and is connected to the second output end of the first mutual inductor and one end of the third resistor through the fourth resistor, the other end of the second resistor is connected to the first end of the first protector and is connected to the other end of the third resistor and the second end of the first mutual inductor through the third capacitor, the third end of the first mutual inductor and the emitter of the first switch tube are both grounded, the seventh end of the first mutual inductor is connected to the base of the first switch tube, the collector of the first switch tube is connected to the cathode of the first indicator light and the first end of the first relay, and the anode of the first indicator is connected to the second end of the first relay, the eighth end of the first protector and the power supply control module through the seventh resistor.
4. A leakage protection plug circuit according to claim 3, characterized in that: The self-check control module includes a first key switch, a first resistor, a first optical coupler and a fifth resistor; The moving end of the first push switch is connected to the first moving end of the first relay switch, the static end of the first push switch is connected to the first end of the first optocoupler through the first resistor, the second end of the first optocoupler passes through the center of the first mutual inductor and is connected to the second end of the output port, the third end of the first optocoupler is connected to the power supply control module, and the fourth end of the first optocoupler is grounded through the fifth resistor.
5. A leakage protection plug circuit according to claim 4, characterized in that: The second switch module includes a first logic chip, a second capacitor, a second switch tube, a second relay and a second relay switch; The A end of the first logic chip is connected to the seventh end of the first protector, the B end of the first logic chip is connected to the fourth end of the first optocoupler, the F electrical energy of the first logic chip is connected to the base of the second switch tube and the first end of the second capacitor, the second end of the second capacitor is grounded, the collector of the second switch tube is connected to the first end of the second relay, the second end of the second relay is connected to the power supply control module, the first moving end and the second moving end of the second relay switch are respectively connected to the first moving end and the second moving end of the first relay switch, and the first static end and the second static end of the second relay switch are respectively connected to the first static end and the second static end of the first relay switch.
6. A leakage protection plug circuit according to claim 5, characterized in that: The power supply control module includes a sixth resistor, a first power tube, a third switch tube, a second logic chip and a first inverter; The gate of the first power tube is connected to the collector of the third switch tube and is connected to the drain of the first power tube and the third end of the first rectifier through the sixth resistor, the source of the first power tube is connected to the eighth end of the first protector, the second end of the second relay and the third end of the first optocoupler, the emitter of the third switch tube is grounded, the base of the third switch tube is connected to the F end of the second logic chip, the A end of the second logic chip is connected to the first end of the second capacitor, the B end of the second logic chip is connected to the output end of the first inverter, and the input end of the first inverter is connected to the fourth end of the first optocoupler.