Remote control portable residual current device that performs fixed-period automatic detection

Abstract

A remote control portable residual current device that performs fixed-period automatic detection, comprising: a remote control portable residual current device, and a fixed-period automatic detection unit for the remote control portable residual current device. The fixed-period automatic detection unit for the remote control portable residual current device comprises a tripping mechanism, a microprocessor MCU, an alternating current signal sampling module, an ACDC power supply, and a remote control signal detection module. The alternating current signal sampling module sends an acquired signal to the MCU. After analysis and processing by the MCU, it is determined whether there is leakage or other circuit faults, and then an on-off control signal is sent to the tripping mechanism. The tripping mechanism operates, determining whether to connect or disconnect a power supply circuit. The MCU can also send, according to periodic automatic detection information set by an embedded program, an automatic detection signal for a control circuit and the tripping mechanism. The tripping mechanism performs automatic on / off detection functions to ensure that a portable residual current device circuit system and operating mechanism remain in a normal standby state. The MCU further receives a remote control signal sent by the remote control signal detection module to control the power supply circuit.

Description

A leakage current protection plug that is remotely controlled and performs automatic detection at fixed intervals Technical Field

[0001] This invention relates to the field of electrical equipment technology, and more specifically, to a residual current device (RCD) plug that can be remotely controlled and perform automatic detection at fixed intervals. Background Technology

[0002] Currently, many high-power electrical appliances, such as electric water heaters, electric heaters, smart toilets, vacuum cleaners, refrigerators, microwave ovens, dishwashers, disinfection cabinets, and medical equipment, must have leakage current protection. The existing method is to use a leakage current protection plug (PRCD - portable residual current device) to replace the ordinary three-phase plug. This allows the PRCD to instantly cut off the power supply when household appliances experience electrical faults such as leakage, overcurrent, overvoltage, undervoltage, overload, overheating, or short circuit, thus preventing damage to the appliances or personal injury due to electric shock.

[0003] To ensure the proper functioning of the residual current device (RCD) plug's operating mechanism and the reliability of electrical safety protection, GB20044 requires RCD plugs to have a test button and a reset button. These are primarily used to check whether the RCD plug's circuit system and operating mechanism are in a normal standby state. Specifically, pressing the "TEST" button at least once a month triggers a leakage current signal, requiring the RCD plug to send a power cut-off signal, and the operating mechanism to disconnect the power supply. Pressing the "RESET" button once triggers a reset signal, and the operating mechanism to restore power supply. However, in actual use, due to user habits and factors such as the RCD plug's installation location and operating environment, the RCD plug's circuit system and operating mechanism are not tested at least monthly. This causes the RCD plug's operating mechanism to lock, rendering it ineffective in protecting against leakage current. Therefore, there is an urgent need in this field for an RCD plug that can automatically perform self-tests at fixed intervals. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides a residual current device (RCD) plug that can be remotely controlled and automatically perform periodic detections. This allows for automatic detection of plug leakage and automatic detection of the operating mechanism at least once a month, ensuring that the RCD plug's circuit system and operating mechanism remain in normal standby mode and preventing circuit system failure or mechanism lock-up. The RCD plug can also be controlled to turn on and off via a remote control or mobile app.

[0005] To achieve the above objectives, a leakage current protection plug that is remotely controlled and performs fixed-period automatic detection is provided, comprising a remote-controlled leakage current protection plug and a remote-controlled leakage current protection plug fixed-period automatic detection unit, wherein:

[0006] The remote control leakage protection plug includes: a front shell, a PCB board, an output wire and a tail clip, a rear shell, a detection coil, a conductive silver point, and a signal probe, wherein the PCB board is fixed in the covering space between the front shell and the rear shell.

[0007] The PCB board is soldered with a reset button, a test button, an indicator light, a ground wire plug, a neutral and live wire plug, a conductive strip, and a neutral and live wire terminal block.

[0008] The PCB board is equipped with a remote-controlled leakage protection plug fixed cycle automatic detection unit;

[0009] The output wire includes a neutral and live wire and an output wire ground wire. One end of the neutral and live wire terminal is connected to the neutral and live wire, and the ground wire plug is connected to the ground wire. The other end of the neutral and live wire terminal is connected to one end of the conductive strip, and the other end of the conductive strip is provided with a circular conductive silver point.

[0010] One end of the conductive silver point is riveted to the live and neutral wire plug, and the other end of the conductive silver point is in contact with the circular conductive silver point on the conductive strip.

[0011] An output wire extends from the detection coil to detect whether the output wire is leaking current.

[0012] In one embodiment of the present invention, the test key, the indicator light and the reset key are electrically connected to preset contacts on the PCB board.

[0013] The automatic detection unit for the fixed cycle of the remote-controlled leakage protection plug includes: a tripping mechanism, a microprocessor (MCU), an optocoupler, a magnetic latching mechanism, a silicon controlled rectifier (SCR) Q1, a SCR Q2, a live wire input terminal, a neutral wire input terminal, an AC current signal sampling module, an AC-DC power supply, and a remote control signal detection module. The AC-DC power supply powers the microprocessor (MCU), and the microprocessor (MCU) receives the signal from the remote control signal detection module and controls the tripping mechanism to control the circuit's on / off state. The AC current signal sampling module serves as the phase reference output by the microprocessor (MCU).

[0014] In one embodiment of the present invention, the tripping mechanism is a linkage switch.

[0015] In one embodiment of the present invention, the microprocessor MCU is soldered onto the PCB board, and the signal probe is mounted on top of it for sensing remote control signals.

[0016] In one embodiment of the present invention, the magnetic holding mechanism is a dual-drive coil, comprising a first drive coil for connecting the circuit and a second drive coil for disconnecting the circuit; the left end of the dual drive coil is connected to the live wire input terminal via a series resistor R3, the right end of the dual drive coil is connected to the cathode of diode D8, the anode of diode D8 is connected to the cathode of silicon controlled rectifier Q1, and the anode of silicon controlled rectifier Q1 is connected to the neutral wire input terminal; the anode of diode D7 is connected to the anode of silicon controlled rectifier Q1, and the cathode of diode D7 is connected to pin 6 of the optocoupler. The optocoupler's pin 4 is connected to resistor R7 and then to the control electrode of the thyristor Q1. The optocoupler's pin 1 is connected to the PORTB5 pin of the microprocessor MCU. The optocoupler's pin 2 is grounded. When the optocoupler receives a signal, its pins 4 and 6 are turned on. The right end of the dual drive coil is also connected to the anode of diode D1. The cathode of diode D1 is connected to the anode of thyristor Q2. The control electrode of thyristor Q2 is connected to the cathode of diode D3. The anode of diode D3 is connected to the PORTB6 pin of the microprocessor MCU. The cathode of thyristor Q2 is grounded.

[0017] In one embodiment of the present invention, the microprocessor MCU is pre-programmed with an embedded program that can determine the execution time of the automatic detection function based on the internal clock of the microprocessor MCU. The embedded program is also pre-programmed with TEST and RESET instructions.

[0018] When the microprocessor (MCU) receives the TEST command, its PORTB6 pin outputs a high level. Current flows through the reverse-connected diode D3 to the control electrode of the thyristor Q2. Due to the high-level trigger, the thyristor Q2 conducts. The current flows from the live wire input through resistor R3, from left to right through the dual drive coils, and then through the positive-connected diode D1 to the anode of the thyristor Q2. The cathode of the thyristor Q2 is grounded. At this time, the current forms a loop. The first drive coil of the dual drive coil generates an attraction force due to the current flowing through it. The push rod of the attraction mechanism drives the contact of the action mechanism to open, cutting off the power supply. After a preset automatic detection time, the microprocessor (MCU) receives the RESET command. When the PORTB5 pin of the microprocessor MCU outputs a high level, current flows through resistor R5 to the optocoupler, turning it on. At this time, the current flows from the neutral input terminal through diode D7, pin 6 of the optocoupler, pin 4 of the optocoupler, and resistor R7 to the control electrode of the thyristor Q1. Since the optocoupler U3 is on, its pins 4 and 6 are connected, and the control electrode of the thyristor Q1 receives a high level, triggering the thyristor Q1 to turn on. The high level on the neutral input terminal flows through the on-circuit thyristor Q1, continues to flow through the reverse-connected diode D8, and then flows from right to left through the second drive coil of the dual drive coil. The dual drive coil generates a repulsive force due to the current flowing through it, and the push rod of the repulsive action mechanism moves to close the contacts of the action mechanism, connecting the power supply.

[0019] In one embodiment of the present invention, the AC current signal sampling module includes: a transistor Q3, the base of the transistor Q3 is connected in series with resistors R6 and R8 and then connected to the cathode of diode D3, the anode of diode D3 is connected to the PORTB6 pin of the microprocessor MCU, the emitter of the transistor Q3 is grounded, and the collector of the transistor Q3 is connected to resistor R10; when the PORTB6 pin of the microprocessor MCU outputs a high level, the current passes through diode D3, resistors R6 and R8 to reach the base of transistor Q3, and after the emitter of the transistor is grounded, a current loop is formed, and the collector of transistor Q3 outputs a leakage signal.

[0020] In one embodiment of the present invention, the AC-CDC power supply includes a bridge rectifier circuit and a voltage regulator. A resistor R3, a dual-drive coil, and a resistor R15 are connected in series between the live wire input terminal and point 1 of the bridge rectifier circuit. The neutral wire input terminal is connected to point 2 of the bridge rectifier circuit. Point 4 of the bridge rectifier circuit is connected to the Vin pin of the voltage regulator. The GND pin of the voltage regulator is grounded. The Vout pin of the voltage regulator outputs 3.3V DC and is connected to the VDD pin of the microprocessor MCU to power the microprocessor MCU.

[0021] In one embodiment of the present invention, the remote control signal detection module is soldered onto the PCB board. The remote control signal detection module is a chip with the function of transmitting and receiving remote control signals. Its pin 2 is grounded and its pin 1 is connected to the PORTE2 pin of the microprocessor MCU.

[0022] In one embodiment of the present invention, a test button, an indicator light and a reset button are electrically connected to preset contacts on the PCB board and soldered onto the PCB board.

[0023] In one embodiment of the present invention, the inductive remote control signal is at least one of the following: infrared signal, 433MHz to 2.4GHz signal, WiFi signal, Bluetooth signal, Zigbee signal, LoRa signal, NBIOT narrowband IoT signal, 4G LTE broadband IoT cat2 or cat3 or cat4 signal, and 2.4G proprietary protocol signal.

[0024] This invention provides a remotely controlled leakage protection plug that performs automatic leakage detection at fixed intervals. Compared with existing leakage protection plugs on the market, this invention is a leakage protection plug with remote control and automatic leakage detection. If a household appliance connected to the plug experiences a leakage or short circuit, the leakage protection plug can instantly disconnect the power supply, providing protection. It can also automatically perform plug detection at least once a month, ensuring the plug remains in a normal standby operating state. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 is a schematic diagram of the external structure of a plug according to an embodiment of the present invention.

[0027] Figure 2 is a schematic diagram of the structure of the plug after the housing is installed according to an embodiment of the present invention.

[0028] Figure 3 is a schematic diagram of the structure of a plug PCB board assembly according to an embodiment of the present invention.

[0029] Figure 4 is an electrical schematic diagram of a remote control leakage protection plug according to an embodiment of the present invention.

[0030] Figure 5 is an electrical principle block diagram of a leakage protection plug according to an embodiment of the present invention.

[0031] Explanation of reference numerals in the attached diagram: 1-Front shell; 2-Reset button; 3-Test button; 4-Indicator light; 5-Remote control signal detection module; 6-Ground plug; 7-Neutral and live wire plug; 8-Connecting wire and tail clip; 9-Rear shell; 10-Detection coil; 11-Magnetic latching mechanism; 12-Conductive silver point; 13-Conductive strip; 14-PCB board; 15-Signal probe; 16-Neutral and live wire terminals; 17-Indicator light. 501-AC mains power supply; 502-AC current signal sampling module; 503-Disconnect mechanism; 504-ACDC power supply; 505-Microprocessor (MCU); 506-Remote control signal detection module; 507-Load circuit. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Figure 1 is a schematic diagram of the plug's external structure according to an embodiment of the present invention; Figure 2 is a schematic diagram of the plug's structure after the housing is installed according to an embodiment of the present invention; Figure 3 is a schematic diagram of the plug's PCB board assembly according to an embodiment of the present invention; Figure 4 is an electrical schematic diagram of a remote-controlled leakage protection plug according to an embodiment of the present invention; and Figure 5 is an electrical block diagram of a leakage protection plug according to an embodiment of the present invention. As shown in Figures 1, 2, 3, 4, and 5, this embodiment provides a leakage protection plug that is remotely controlled and performs fixed-cycle automatic detection, which includes a remote-controlled leakage protection plug and a remote-controlled leakage protection plug fixed-cycle automatic detection unit, wherein:

[0034] The remote control leakage protection plug, as shown in Figures 1, 2 and 3, includes a front shell 1, a PCB board 14, an output wire and tail clip 8, a rear shell 9, a detection coil 10, a conductive silver point 12, and a signal probe 15, wherein the PCB board 14 is fixed in the covering space between the front shell 1 and the rear shell 9.

[0035] The PCB board 14 is soldered with a reset button 2, a test button 3, an indicator light 4, a ground wire plug 6, a neutral and live wire plug 7, a conductive strip 13, and a neutral and live wire terminal 16.

[0036] The PCB board 14 is equipped with an automatic detection unit for the fixed cycle of the remote control leakage protection plug.

[0037] The output wire includes a neutral and live wire and an output wire ground wire. One end of the neutral and live wire terminal 16 is connected to the neutral and live wire, and the ground wire plug 6 is connected to the ground wire. The other end of the neutral and live wire terminal 16 is connected to one end of the conductive strip 13, and the other end of the conductive strip is provided with a circular conductive silver dot.

[0038] One end of the conductive silver point 12 is riveted to the neutral and live wire plug 7, and the other end of the conductive silver point is in contact with the circular conductive silver point on the conductive strip 13.

[0039] An output wire extends through the detection coil 10 to detect whether the output wire is leaking current.

[0040] In this embodiment, the test button 3, the indicator light 4, and the reset button 2 are electrically connected to preset contacts on the PCB board 14.

[0041] The automatic detection unit for the fixed cycle of the remote control leakage protection plug, as shown in Figures 4 and 5, includes a tripping mechanism, a microprocessor (MCU) (U2 in Figure 4), an optocoupler (U3), a magnetic holding mechanism 11, a silicon controlled rectifier (SCR) Q1, a SCR Q2, a live wire input (L-IN), a neutral wire input (N-IN), an AC current signal sampling module, an AC-DC power supply, and a remote control signal detection module. The AC-DC power supply powers the microprocessor (MCU), and the microprocessor (MCU) receives the signal from the remote control signal detection module and controls the tripping mechanism to control the circuit's on / off state. The AC current signal sampling module serves as the phase reference output by the microprocessor (MCU).

[0042] The tripping mechanism is a linkage switch; the tripping mechanism is driven by the microprocessor MCU (U2) to send an on / off control signal. The signal collected by the AC current signal sampling module is sent to the microprocessor MCU (U2). After the microprocessor MCU (U2) analyzes and processes the signal, it determines whether there is leakage or other circuit faults, and then sends an on / off control signal to the tripping mechanism. The tripping mechanism then operates to determine whether to connect or disconnect the power supply circuit.

[0043] The microprocessor MCU (U2) is soldered onto the PCB board 14, and a signal probe 15 is mounted on top of it for sensing remote control signals. The sensing remote control signal can be at least one of the following: infrared signal, 433MHz to 2.4GHz signal, WiFi signal, Bluetooth signal, Zigbee signal, LoRa signal, NBIOT narrowband IoT signal, 4G LTE broadband IoT cat2 or cat3 or cat4 signal, and 2.4G proprietary protocol signal. The signal transmitting device can be either a remote control or an APP.

[0044] The magnetic holding mechanism 11 is a dual drive coil L1, including a first drive coil for connecting the circuit and a second drive coil for disconnecting the circuit.

[0045] The dual-drive coil L1 has its left end connected to the live wire input terminal via a series resistor R3. The right end of the dual-drive coil L1 is connected to the cathode of diode D8. The anode of diode D8 is connected to the cathode of the thyristor Q1, and the anode of the thyristor Q1 is connected to the neutral wire input terminal. The anode of diode D7 is connected to the anode of the thyristor Q1, and the cathode of diode D7 is connected to pin 6 of the optocoupler (U3). Pin 4 of the optocoupler (U3) is connected to the control electrode of the thyristor Q1 via a resistor R7. The optocoupler (U3... 3) Pin 1 is connected to PORTB5 of the microprocessor MCU (U2), and pin 2 of the optocoupler (U3) is grounded. When the optocoupler receives a signal, its pins 4 and 6 are turned on. The right end of the dual drive coil L1 is also connected to the anode of diode D1. The cathode of diode D1 is connected to the anode of thyristor Q2. The control electrode of thyristor Q2 is connected to the cathode of diode D3. The anode of diode D3 is connected to PORTB6 of the microprocessor MCU (U2), and the cathode of thyristor Q2 is grounded.

[0046] An embedded program is designed in the microprocessor MCU (U2). This program determines the execution of the automatic detection function based on the internal clock of U2. The program also includes TEST and RESET instructions. The specific process of the timed self-test function is as follows:

[0047] First, set the initial time for executing the automatic detection function in the program, such as executing the first automatic detection function at 10:00 AM on December 13, 2024, and set the cycle period, such as 30 days. U2 will execute the automatic detection function again at the specified time after 30 days according to the set program.

[0048] When the microprocessor MCU (U2) receives the TEST command, the PORTB6 pin of the microprocessor MCU (U2) outputs a high level. The current flows through the reverse-connected diode D3 to the control electrode of the thyristor Q2. Due to the high-level trigger, the thyristor Q2 is turned on. The current flows from the live wire input terminal through the resistor R3, from left to right through the dual drive coil L1, and then through the positive-connected diode D1 to the anode of the thyristor Q2. The cathode of the thyristor Q2 is grounded. At this time, the current forms a loop. The first drive coil of the dual drive coil L1 generates a pulling force because of the current flowing through it. The pull-in action mechanism push rod drives the action mechanism contacts to open, cutting off the power supply. After a preset automatic detection time, for example 15 seconds, the microprocessor MCU (U2) receives a RESET command. The PORTB5 pin of the microprocessor MCU (U2) outputs a high level, and the current flows through the resistor R5 to the optocoupler U3, making it conduct. At this time, the current flows from the neutral input terminal N_IN through the diode D7 and the pin 6 of the optocoupler U3. The pin 4 of the optocoupler U3 and the resistor R7 reach the control electrode of the thyristor Q1. Since the optocoupler U3 is conducting, its pins 4 and 6 are connected. The control electrode of the thyristor Q1 receives a high level, triggering the thyristor Q1 to conduct. The high level on the neutral input terminal flows through the conducting thyristor Q1, continues to flow through the reverse-connected diode D8, and then flows from right to left through the second drive coil of the dual drive coil L1. The dual drive coil L1 generates a repulsive force because of the current flowing through it. The push rod of the repulsive action mechanism moves, causing the contact of the action mechanism to close and connecting the power supply.

[0049] The AC current signal sampling module includes: a transistor Q3, the base of transistor Q3 is connected in series with resistors R6 and R8 and then connected to the cathode of diode D3, the anode of diode D3 is connected to the PORTB6 pin of the microprocessor MCU, the emitter of transistor Q3 is grounded, and the collector of transistor Q3 is connected to resistor R10; when the PORTB6 pin of the microprocessor MCU outputs a high level, the current passes through diode D3, resistors R6 and R8 to the base of transistor Q3, and the current loop is formed after the emitter of the transistor is grounded. The collector of transistor Q3 outputs a leakage current signal, which is used to collect the AC voltage waveform as the phase reference for the signal output of the microprocessor MCU (U2).

[0050] The AC / DC power supply includes a bridge rectifier circuit B1 and a voltage regulator DY1. The live wire input terminal L_IN is connected in series with point 1 of the bridge rectifier circuit B1, followed by a resistor R3, a dual drive coil L1, and a resistor R15. The neutral wire input terminal N_IN is connected to point 2 of the bridge rectifier circuit B1. Point 4 of the bridge rectifier circuit B1 is connected to the Vin pin (pin 3) of the voltage regulator DY1. The GND pin of the voltage regulator DY1 is grounded. The Vout pin (pin 2) of the voltage regulator DY1 outputs 3.3V DC power to power the microprocessor MCU (U2) and is connected to the VDD pin of the microprocessor MCU (U2).

[0051] The remote control signal detection module 5 (e.g., 1838T) is soldered onto the PCB board and has the function of transmitting and receiving remote control signals. Its pin 2 is grounded and its pin 1 is connected to the PORTE2 pin of the microprocessor MCU (U2). After receiving the remote control signal sensed by the signal probe, the remote control signal detection module (1838T) transmits the signal to the microprocessor MCU (U2). The microprocessor MCU (U2) will connect and disconnect the circuit connection according to the remote control signal.

[0052] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of one embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing the present invention.

[0053] Those skilled in the art will understand that the modules in the apparatus of the embodiments can be distributed in the apparatus of the embodiments as described in the embodiments, or they can be located in one or more devices different from this embodiment with corresponding changes. The modules of the above embodiments can be combined into one module, or they can be further divided into multiple sub-modules.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A leakage current protection plug that is remotely controlled and performs automatic detection at fixed intervals, characterized in that, include: A remote-controlled leakage protection plug and a remote-controlled leakage protection plug fixed-cycle automatic detection unit, wherein: The remote control leakage protection plug includes: a front shell, a PCB board, an output wire and a tail clip, a rear shell, a detection coil, a conductive silver point, and a signal probe, wherein the PCB board is fixed in the covering space between the front shell and the rear shell. The PCB board is soldered with a ground wire plug, a neutral and live wire plug, a conductive strip, and a neutral and live wire terminal. The PCB board is equipped with an automatic detection unit for the fixed cycle of the remote control leakage protection plug. The output wire includes a live wire and a ground wire. One end of the live wire terminal is connected to the live wire, and the ground wire plug is connected to the ground wire. The other end of the live wire terminal is connected to one end of the conductive strip, and the other end of the conductive strip is provided with a circular conductive silver dot. One end of the conductive silver point is riveted to the live and neutral wire plug, and the other end of the conductive silver point is in contact with the circular conductive silver point on the conductive strip; An output wire extends from the detection coil to detect whether the output wire is leaking current. The automatic detection unit for the fixed cycle of the remote-controlled leakage protection plug includes: a tripping mechanism, a microprocessor (MCU), an optocoupler, a magnetic latching mechanism, a silicon controlled rectifier (SCR) Q1, a SCR Q2, a live wire input terminal, a neutral wire input terminal, an AC current signal sampling module, an AC-DC power supply, and a remote control signal detection module. The AC-DC power supply powers the microprocessor (MCU), and the microprocessor (MCU) receives the signal from the remote control signal detection module and controls the tripping mechanism to control the circuit's on / off state. The AC current signal sampling module serves as the phase reference output by the microprocessor (MCU).

2. The leakage protection plug according to claim 1, characterized in that, The tripping mechanism is a linkage switch.

3. The leakage protection plug according to claim 1, characterized in that, The microprocessor (MCU) is soldered onto the PCB board, and the signal probe is mounted on top of it to sense remote control signals.

4. The leakage protection plug according to claim 1, characterized in that, The magnetic holding mechanism is a dual-drive coil, comprising a first drive coil for connecting the circuit and a second drive coil for disconnecting the circuit. The left end of the dual drive coil is connected in series with a resistor R3 and then connected to the live wire input terminal. The right end of the dual drive coil is connected to the cathode of diode D8. The anode of diode D8 is connected to the cathode of the thyristor Q1, and the anode of the thyristor Q1 is connected to the neutral wire input terminal. The anode of diode D7 is connected to the anode of the thyristor Q1, and the cathode of diode D7 is connected to pin 6 of the optocoupler. Pin 4 is connected to resistor R7 and then to the control electrode of SCR Q1. Pin 1 of the optocoupler is connected to PORTB5 of the microprocessor MCU. Pin 2 of the optocoupler is grounded. When the optocoupler receives a signal, its pins 4 and 6 are turned on. The right end of the dual drive coil is also connected to the anode of diode D1. The cathode of diode D1 is connected to the anode of SCR Q2. The control electrode of SCR Q2 is connected to the cathode of diode D3. The anode of diode D3 is connected to PORTB6 of the microprocessor MCU. The cathode of SCR Q2 is grounded.

5. The leakage protection plug according to claim 4, characterized in that, The microprocessor MCU has a pre-set embedded program that can determine the execution time of the automatic detection function based on the internal clock of the microprocessor MCU. The embedded program also has pre-set TEST and RESET instructions. When the microprocessor (MCU) receives the TEST command, its PORTB6 pin outputs a high level. Current flows through the reverse-connected diode D3 to the control electrode of the thyristor Q2. Due to the high-level trigger, the thyristor Q2 conducts. The current flows from the live wire input through resistor R3, from left to right through the dual drive coils, and then through the positive-connected diode D1 to the anode of the thyristor Q2. The cathode of the thyristor Q2 is grounded. At this time, the current forms a loop. The first drive coil of the dual drive coil generates an attraction force due to the current flowing through it. The push rod of the attraction mechanism drives the contact of the action mechanism to open, cutting off the power supply. After a preset automatic detection time, the microprocessor (MCU) receives the RESET command. When the PORTB5 pin of the microprocessor MCU outputs a high level, current flows through resistor R5 to the optocoupler, turning it on. At this time, the current flows from the neutral input terminal through diode D7, pin 6 of the optocoupler, pin 4 of the optocoupler, and resistor R7 to the control electrode of the thyristor Q1. Since the optocoupler U3 is on, its pins 4 and 6 are connected, and the control electrode of the thyristor Q1 receives a high level, triggering the thyristor Q1 to turn on. The high level on the neutral input terminal flows through the on-circuit thyristor Q1, continues to flow through the reverse-connected diode D8, and then flows from right to left through the second drive coil of the dual drive coil. The dual drive coil generates a repulsive force due to the current flowing through it, and the push rod of the repulsive action mechanism moves to close the contacts of the action mechanism, connecting the power supply.

6. The leakage protection plug according to claim 1, characterized in that, The AC current signal sampling module includes: a transistor Q3, the base of transistor Q3 is connected in series with resistors R6 and R8 and then connected to the cathode of diode D3, the anode of diode D3 is connected to the PORTB6 pin of the microprocessor MCU, the emitter of transistor Q3 is grounded, and the collector of transistor Q3 is connected to resistor R10; when the PORTB6 pin of the microprocessor MCU outputs a high level, the current passes through diode D3, resistors R6 and R8 to reach the base of transistor Q3, and after the emitter of the transistor is grounded, a current loop is formed, and the collector of transistor Q3 outputs a leakage signal.

7. The leakage protection plug according to claim 1, characterized in that, The AC-DC power supply includes a bridge rectifier circuit and a voltage regulator. The live wire input terminal is connected in series with point 1 of the bridge rectifier circuit via a resistor R3, a dual drive coil, and a resistor R15. The neutral wire input terminal is connected to point 2 of the bridge rectifier circuit. Point 4 of the bridge rectifier circuit is connected to the Vin pin of the voltage regulator. The GND pin of the voltage regulator is grounded. The Vout pin of the voltage regulator outputs 3.3V DC and is connected to the VDD pin of the microprocessor MCU to power the microprocessor MCU.

8. The leakage protection plug according to claim 1, characterized in that, The remote control signal detection module is soldered onto the PCB board. The remote control signal detection module is a chip with the function of sending and receiving remote control signals. Its pin 2 is grounded and its pin 1 is connected to the PORTE2 pin of the microprocessor MCU.

9. The leakage protection plug according to claim 1, characterized in that, A test button, an indicator light, and a reset button are electrically connected to preset contacts on the PCB board and soldered onto the PCB board.

10. The leakage protection plug according to claim 3, characterized in that, The inductive remote control signal is at least one of the following: infrared signal, 433MHz to 2.4GHz signal, WiFi signal, Bluetooth signal, Zigbee signal, LoRa signal, NBIOT narrowband IoT signal, 4G LTE broadband IoT cat2 or cat3 or cat4 signal, and 2.4G proprietary protocol signal.

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