Remote-control electric leakage protection plug capable of executing automatic detection of fixed period

Abstract

A remote control leakage protection plug executing fixed period automatic detection comprises a remote control leakage protection plug and a remote control leakage protection plug fixed period automatic detection unit, and the remote control leakage protection plug fixed period automatic detection unit 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 collected signals to the MCU, whether electric leakage or other circuit faults exist or not is judged after the signals are analyzed and processed by the MCU, then on-off control signals are sent to the tripping mechanism, the tripping mechanism acts, and whether a power supply loop is switched on or switched off is determined. The MCU can also send out automatic detection signals aiming at the control circuit and the tripping mechanism according to regular automatic detection information set by the embedded program, and the tripping mechanism executes an automatic on-off detection function to ensure that the leakage protection plug circuit system and the action mechanism are kept in a normal standby state. The MCU further receives a remote control signal sent by the remote control signal detection module so as to control the power supply circuit.

Description

Technical Field

[0001] The invention relates to the technical field of electrical equipment, and in particular to a leakage protection plug which can be remotely controlled and perform automatic detection in a fixed period. Background Art

[0002] At present, some 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 protection functions. The existing method is to replace ordinary three-phase plugs with leakage protection plugs (PRCD-portable residual current device), so that once household electrical appliances have leakage, overcurrent, overvoltage, undervoltage, overload, overtemperature, short circuit and other electrical faults, the leakage protection plug can instantly cut off the power supply to avoid damage to the appliances or personal injury accidents due to electric shock.

[0003] In order to ensure the correctness of the action mechanism of the leakage protection plug and the reliability of the safe power protection of electrical appliances, GB20044 requires that the leakage protection plug has a test (TEST) button and a reset (RESET) button, which are mainly used to detect whether the leakage protection plug circuit system and the action mechanism maintain a normal standby state, that is, it is required to trigger a leakage signal by pressing the "TEST" button at least once a month, requiring the leakage protection plug to send a power cut-off signal, and the action mechanism to perform the action of cutting off the power supply, and pressing the "RESET" button once requires the leakage protection plug to send a reset signal, and the action mechanism to perform the power restoration action, and the leakage protection plug restores normal power supply. However, in actual use, due to the user's usage habits and the installation location and use environment of the leakage protection plug, the circuit system and the action mechanism of the leakage protection plug cannot be tested at least once a month, so that the action mechanism of the leakage protection plug is locked, and when a leakage accident actually occurs, it cannot play a protective role. Therefore, the art is in urgent need of a leakage protection plug that can automatically perform self-checking according to a fixed period. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a leakage protection plug that can be remotely controlled and perform fixed-period automatic detection, which is used to automatically realize the automatic detection of plug leakage and the automatic detection of the actuating mechanism at least once a month, ensuring that the circuit system and the actuating mechanism of the leakage protection plug are continuously in a normal standby working state, and the detection circuit system will not fail or the actuating mechanism will not be locked. The leakage protection plug can also control the power on and off of the leakage protection plug through a remote control or a mobile phone APP.

[0005] In order to achieve the above object, a leakage protection plug which can remotely control and perform fixed period automatic detection is provided, which includes a remote control leakage protection plug and a remote control leakage protection plug fixed period automatic detection unit, wherein:

[0006] The remote control leakage protection plug comprises: a front shell, a PCB board, an output wire and a tail card, a rear shell, a detection coil, a conductive silver dot, 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 welded with a reset button, a test button, an indicator light, a ground wire plug, a zero-live wire plug, a conductive tape, and a zero-live wire terminal;

[0008] The PCB board is provided with a remote control leakage protection plug fixed period automatic detection unit;

[0009] The output wires include a live wire and a zero wire, a ground wire, one end of a live wire terminal is connected to the live wire, and a ground wire plug is connected to the ground wire; the other end of the live wire terminal is connected to one end of a conductive strip, and the other end of the conductive strip is provided with a circular conductive silver dot;

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

[0011] An output wire is passed through the detection coil to detect whether the output wire has leakage;

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

[0013] The remote control leakage protection plug fixed period automatic detection unit includes: a tripping mechanism, a microprocessor MCU, an optocoupler, a magnetic holding action mechanism, a thyristor Q1, a thyristor Q2, a live wire input terminal, a neutral wire input terminal, an AC current signal sampling module, an ACDC power supply, and a remote control signal detection module; the ACDC power supply supplies power to the microprocessor MCU, and the microprocessor MCU controls the on and off of the tripping mechanism to control the on and off of the circuit after receiving the signal sent by the remote control signal detection module, and the AC current signal sampling module outputs a phase reference for the microprocessor MCU.

[0014] In an 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 on the PCB board, and the signal probe is installed above the PCB board for sensing the remote control signal.

[0016] In one embodiment of the present invention, the magnetic holding action mechanism is a dual drive coil, which includes 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 input end after being connected in series with a resistor R3, the right end of the dual drive coil is connected to the cathode of a diode D8, the anode of the diode D8 is connected to the cathode of the thyristor Q1, and the anode of the thyristor Q1 is connected to the neutral input end; the anode of the diode D7 is connected to the anode of the thyristor Q1, and the cathode of the diode D7 is connected to the pin 6 of the optocoupler. , pin 4 of the optocoupler is connected to the resistor R7 and then to the control electrode of the thyristor Q1, pin 1 of the optocoupler is connected to the PORTB5 pin of the microprocessor MCU, pin 2 of the optocoupler is grounded, and when the optocoupler receives a signal, its pin 4 and pin 6 are turned on; the right end of the dual drive coil is also connected to the anode of the diode D1, the cathode of the diode D1 is connected to the anode of the thyristor Q2, the control electrode of the thyristor Q2 is connected to the cathode of the diode D3, the anode of the diode D3 is connected to the PORTB6 pin of the microprocessor MCU, and the cathode of the thyristor Q2 is grounded.

[0017] In one embodiment of the present invention, the microprocessor MCU is preset with an embedded program capable of determining the time for executing the automatic detection function according to the internal clock of the microprocessor MCU, and the embedded program is also preset with a TEST instruction and a RESET instruction;

[0018] Among them, when the microprocessor MCU receives the TEST instruction, the PORTB6 pin of the microprocessor MCU outputs a high level, and the current reaches the control electrode of the thyristor Q2 after passing through the reverse-connected diode D3. Due to the high-level trigger, the thyristor Q2 is turned on; the current flows from the live wire input end through the resistor R3, flows from left to right through the dual drive coil, and then passes through the forward-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, and the first drive coil of the dual drive coil generates an attraction force because of the current passing through it. The push rod of the attraction action mechanism drives the action mechanism contacts to disconnect and cut off the power supply; after a preset automatic detection time, the microprocessor MCU receives the RESET instruction, The PORTB5 pin of the microprocessor MCU outputs a high level, and the current passes through the resistor R5 to the optocoupler to turn it on. At this time, the current is connected from the zero line input end through the diode D7 and the pin 6 of the optocoupler, and the pin 4 of the optocoupler and the resistor R7 reach the control electrode of the thyristor Q1; because the optocoupler U3 is turned on, its pin 4 and pin 6 are connected, and the control electrode of the thyristor Q1 receives a high level, triggering the thyristor Q1 to turn on, and the high level on the zero line input end passes through the turned-on thyristor Q1 and 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 because of the current passing through it, and the push rod of the repulsive action mechanism drives the action mechanism contacts to close, and the power supply is turned on.

[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 a diode D3, the anode of the 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 the diode D3, the resistor R6, and the resistor R8 to reach the base of the transistor Q3, and a current loop is formed after the transistor emitter is grounded, and the collector of the transistor Q3 outputs a leakage signal.

[0020] In one embodiment of the present invention, the ACDC 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 input end and one point of the bridge rectifier circuit, a neutral input end is connected to two points of the bridge rectifier circuit, four points of the bridge rectifier circuit are connected to the Vin pin of the voltage regulator, the GND pin of the voltage regulator is grounded, and 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 welded on the PCB board, and 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.

[0022] In an embodiment of the present invention, a test key, an indicator light and a reset key are electrically connected to the preset contacts of the PCB board respectively and are welded on the PCB board.

[0023] In one embodiment of the present invention, the induction remote control signal is at least one of an infrared signal, a 433Mhz to 2.4Ghz signal, a WiFi signal, a Bluetooth signal, a zigbee signal, a lora signal, a NBiot narrowband Internet of Things signal, a 4G LTE broadband Internet of Things cat2 or cat3 or cat4 signal, and a 2.4G private protocol signal.

[0024] Compared with the leakage protection plugs on the existing market, the leakage protection plug provided by the present invention, which can be remotely controlled and perform automatic detection at a fixed period, is a leakage protection plug with remote control and automatic leakage detection. Once a household appliance connected to the plug leaks or shorts, the leakage protection plug can instantly disconnect the power supply to provide protection. It can also automatically realize the automatic detection function of the plug at least once a month to ensure that the plug is continuously in a normal standby working state. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

[0027] Figure 2 This is a schematic structural diagram of a plug after installing a rear shell according to an embodiment of the present invention.

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

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

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

[0031] Explanation of reference numerals: 1-front shell; 2-reset key; 3-test key; 4-indicator light; 5-remote control signal detection module; 6-ground plug; 7-neutral and live plug; 8-connecting wires and tail card; 9-rear shell; 10-detection coil; 11-magnetic holding mechanism; 12-conductive silver point; 13-conductive belt; 14-PCB board; 15-signal probe; 16-neutral and live terminal; 17-indicator light. 501-AC mains power supply; 502-AC current signal sampling module; 503-release mechanism; 504-ACDC power supply; 505-microprocessor MCU; 506-remote control signal detection module; 507-load circuit. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Figure 1 This is a schematic diagram of the appearance of a plug according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of a plug after installing a rear shell according to an embodiment of the present invention. Figure 3A schematic diagram of the structure of a plug PCB board assembly according to an embodiment of the present invention; Figure 4 The electrical schematic diagram of the remote control leakage protection plug according to one embodiment of the present invention is shown in FIG. Figure 5 FIG. 1 is an electrical principle block diagram of a leakage protection plug according to an embodiment of the present invention. Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, this embodiment provides a leakage protection plug that can be remotely controlled and perform fixed-period automatic detection, which includes a remote-controlled leakage protection plug and a remote-controlled leakage protection plug fixed-period automatic detection unit, wherein:

[0034] The remote control leakage protection plug, such as Figure 1 , Figure 2 and Figure 3 As shown, it includes a front shell 1, a PCB board 14, an output wire and tail card 8, a rear shell 9, a detection coil 10, a conductive silver dot 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 welded with a reset button 2, a test button 3, an indicator light 4, a ground wire plug 6, a zero-live wire plug 7, a conductive strip 13, and a zero-live wire terminal 16;

[0036] The PCB board 14 is provided with a remote control leakage protection plug fixed period automatic detection unit;

[0037] The output wires include a live wire and a ground wire. One end of a live wire terminal 16 is connected to the live wire, and a ground plug 6 is connected to the ground wire. The other end of the live wire terminal 16 is connected to one end of a conductive strip 13. 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 belt 13;

[0039] An output wire is passed through the detection coil 10 to detect whether the output wire has leakage;

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

[0041] The remote control leakage protection plug fixed period automatic detection unit, such as Figure 4 , Figure 5 As shown, it includes a tripping mechanism, a microprocessor MCU ( Figure 4U2 in the figure), an optocoupler (U3), a magnetic holding action mechanism 11, a thyristor Q1, a thyristor Q2, a live wire input terminal (L-IN), a neutral wire input terminal (N-IN), an AC current signal sampling module, an ACDC power supply, and a remote control signal detection module; the ACDC power supply supplies power to the microprocessor MCU, and the microprocessor MCU controls the on and off of the tripping mechanism to control the on and off of the circuit after receiving the signal sent by the remote control signal detection module, and the AC current signal sampling module outputs a phase reference for the microprocessor MCU.

[0042] The tripping mechanism is a linkage switch; the tripping mechanism is driven by an on-off control signal sent by a microprocessor MCU (U2); the signal collected by the AC current signal sampling module is sent to the microprocessor MCU (U2); after being analyzed and processed by the microprocessor MCU (U2), it is determined whether there is leakage or other circuit faults, and then an on-off control signal is sent to the tripping mechanism, and the tripping mechanism is activated to determine whether to connect or disconnect the power supply circuit.

[0043] The microprocessor MCU (U2) is welded on the PCB board 14, and a signal probe 15 is installed above the PCB board 14 for sensing the remote control signal. The sensing remote control signal can be at least one of an infrared signal, a 433Mhz to 2.4Ghz signal, a WiFi signal, a Bluetooth signal, a Zigbee signal, a Lora signal, an NBiot narrowband Internet of Things signal, a 4G LTE broadband Internet of Things cat2 or cat3 or cat4 signal, and a 2.4G private protocol signal. The signal transmitting device can be either a remote control or an APP;

[0044] The magnetic holding action mechanism 11 is a double driving coil L1 including a first driving coil for connecting the circuit and a second driving coil for disconnecting the circuit;

[0045] The left end of the dual drive coil L1 is connected in series with a resistor R3 and then connected to the live line input end; the right end of the dual drive coil L1 is connected to the cathode of a diode D8, the anode of the diode D8 is connected to the cathode of the thyristor Q1, and the anode of the thyristor Q1 is connected to the neutral line input end; the anode of the diode D7 is connected to the anode of the thyristor Q1, and the cathode of the diode D7 is connected to the pin 6 of the optical coupler (U3); the pin 4 of the optical coupler (U3) is connected to the resistor R7 and then connected to the control electrode of the thyristor Q1; the optical coupler (U3) 3) is connected to the PORTB5 pin of the microprocessor MCU (U2), the pin 2 of the optical coupler (U3) is grounded, and when the optical coupler 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 the diode D1, the cathode of the diode D1 is connected to the anode of the thyristor Q2, the control electrode of the thyristor Q2 is connected to the cathode of the diode D3, the anode of the diode D3 is connected to the PORTB6 pin of the microprocessor MCU (U2), and the cathode of the thyristor Q2 is grounded;

[0046] An embedded program is designed in the microprocessor MCU (U2), and the program determines the execution of the automatic detection function according to the internal clock of U2. The program also includes TEST instructions 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 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 instruction, the PORTB6 pin of the microprocessor MCU (U2) outputs a high level, and the current reaches the control electrode of the thyristor Q2 after passing through the reverse-connected diode D3. Due to the high-level trigger, the thyristor Q2 is turned on; the current flows from the live wire input end through the resistor R3, flows from left to right through the dual drive coil L1, and then passes through the forward-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, and the first drive coil of the dual drive coil L1 generates an attraction force because of the current passing through it. The push rod of the attraction action mechanism drives the action mechanism contacts to open, thereby cutting off the power supply. After a preset automatic detection time, for example, 15 seconds, the microprocessor MCU (U2) receives a RESET instruction, and the PORTB5 pin of the microprocessor MCU (U2) outputs a high level. The current passes through the resistor R5 to the optocoupler U3 to turn it on. At this time, the current passes through the diode D7 and the pin 6 of the optocoupler U3 from the zero line input terminal N_IN, and the pin 4 of the optocoupler U3 and the resistor R7 to reach the control electrode of the thyristor Q1; because the optocoupler U3 is turned on, its pin 4 and pin 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 zero line input terminal passes through the turned-on thyristor Q1 and 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 passing through it, and the push rod of the repulsive action mechanism drives the action mechanism contacts to close, and the power supply is turned on.

[0049] 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 a diode D3, the anode of the 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 the diode D3, the resistor R6, and the resistor R8 to reach the base of the transistor Q3, the emitter of the transistor is grounded to form a current loop, and the collector of the transistor Q3 outputs a leakage signal for collecting an AC voltage waveform as a phase reference for the signal output of the microprocessor MCU (U2).

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

[0051] The remote control signal detection module 5 (for example, 1838T) is welded on the PCB board and has the function of sending and receiving remote control signals. Its pin 2 is grounded, and pin 1 is connected to the PORTE2 pin of the microprocessor MCU (U2). After the remote control signal detection module (1838T) receives the remote control signal sensed by the signal probe, it transmits the signal to the microprocessor MCU (U2), and the microprocessor MCU (U2) will connect or disconnect the circuit connection according to the remote control signal.

[0052] Those skilled in the art can understand that the accompanying drawings are only schematic diagrams of an embodiment, and the modules or processes in the accompanying drawings are not necessarily required to implement the present invention.

[0053] Those skilled in the art can understand that the modules in the device in the embodiment can be distributed in the device in the embodiment according to the description of the embodiment, or can be changed accordingly and located in one or more devices different from the embodiment. The modules in the above embodiment can be combined into one module, or 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, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A leakage protection plug that can be remotely controlled and automatically detect at a fixed period, characterized in that: include: A remote control leakage protection plug and a remote control leakage protection plug fixed period automatic detection unit, wherein: The remote control leakage protection plug comprises: a front shell, a PCB board, an output wire and a tail card, a rear shell, a detection coil, a conductive silver dot, and a signal probe, wherein the PCB board is fixed in the covering space between the front shell and the rear shell; A ground wire plug, a neutral wire plug, a conductive tape, and a neutral wire terminal are welded on the PCB board; The PCB board is provided with a fixed period automatic detection unit of the remote control leakage protection plug; The output wires include an output wire neutral wire and an output wire ground wire, one end of the neutral wire terminal is connected to the output wire neutral wire, and the ground wire plug is connected to the output wire ground wire; the other end of the neutral 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 neutral and live wire plug, and the other end of the conductive silver point is in contact with the circular conductive silver point on the conductive belt; An output wire is passed through the detection coil to detect whether the output wire has leakage; The remote control leakage protection plug fixed period automatic detection unit includes: a tripping mechanism, a microprocessor MCU, an optocoupler, a magnetic holding action mechanism, a thyristor Q1, a thyristor Q2, a live wire input terminal, a neutral wire input terminal, an AC current signal sampling module, an ACDC power supply, and a remote control signal detection module; the ACDC power supply supplies power to the microprocessor MCU, and the microprocessor MCU controls the on and off of the tripping mechanism to control the on and off of the circuit after receiving the signal sent by the remote control signal detection module, and the AC current signal sampling module outputs a phase reference for 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 welded on the PCB board, and the signal probe is installed above the microprocessor MCU for sensing the remote control signal.

4. The leakage protection plug according to claim 1, characterized in that: The magnetic holding action mechanism is a double driving coil, which includes a first driving coil for connecting the circuit and a second driving coil for disconnecting the circuit; the left end of the double driving coil is connected to the live wire input end after being connected in series with a resistor R3, the right end of the double driving coil is connected to the cathode of a diode D8, the anode of the diode D8 is connected to the cathode of the thyristor Q1, and the anode of the thyristor Q1 is connected to the neutral line input end; the anode of the diode D7 is connected to the anode of the thyristor Q1, the cathode of the diode D7 is connected to the pin 6 of the optocoupler, and the pin of the optocoupler Pin 4 is connected to resistor R7 and then to the control electrode of thyristor Q1, pin 1 of the optocoupler is connected to pin PORTB5 of the microprocessor MCU, pin 2 of the optocoupler is grounded, and when the optocoupler receives a signal, its pin 4 and pin 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 pin PORTB6 of the microprocessor MCU, and the cathode of thyristor Q2 is grounded.

5. The leakage protection plug according to claim 4, characterized in that: The microprocessor MCU is preset with an embedded program capable of determining the time for executing the automatic detection function according to the internal clock of the microprocessor MCU, and the embedded program is also preset with a TEST instruction and a RESET instruction; Among them, when the microprocessor MCU receives the TEST instruction, the PORTB6 pin of the microprocessor MCU outputs a high level, and the current reaches the control electrode of the thyristor Q2 after passing through the reverse-connected diode D3. Due to the high-level trigger, the thyristor Q2 is turned on; the current flows from the live wire input end through the resistor R3, flows from left to right through the dual drive coil, and then passes through the forward-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, and the first drive coil of the dual drive coil generates an attraction force because of the current passing through it. The push rod of the attraction action mechanism drives the action mechanism contacts to disconnect and cut off the power supply; after a preset automatic detection time, the microprocessor MCU receives the RESET instruction, The PORTB5 pin of the microprocessor MCU outputs a high level, and the current passes through the resistor R5 to the optocoupler to turn it on. At this time, the current is connected from the zero line input end through the diode D7 and the pin 6 of the optocoupler, and the pin 4 of the optocoupler and the resistor R7 reach the control electrode of the thyristor Q1; because the optocoupler U3 is turned on, its pin 4 and pin 6 are connected, and the control electrode of the thyristor Q1 receives a high level, triggering the thyristor Q1 to turn on, and the high level on the zero line input end passes through the turned-on thyristor Q1 and 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 because of the current passing through it, and the push rod of the repulsive action mechanism drives the action mechanism contacts to close, and the power supply is turned on.

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 the transistor Q3 is connected in series with resistors R6 and R8 and then connected to the cathode of a diode D3, the anode of the 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 the diode D3, the resistor R6, and the resistor R8 to reach the base of the transistor Q3, the transistor emitter is grounded to form a current loop, and the collector of the transistor Q3 outputs a leakage signal.

7. The leakage protection plug according to claim 1, characterized in that: The ACDC 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 input end and one point of the bridge rectifier circuit. The neutral input end is connected to two points of the bridge rectifier circuit. Four points of the bridge rectifier circuit are 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 welded on 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 respectively electrically connected to the preset contacts of the PCB board and are welded on the PCB board.

10. The leakage protection plug according to claim 3, characterized in that: The induction remote control signal is at least one of an infrared signal, a 433Mhz to 2.4Ghz signal, a WiFi signal, a Bluetooth signal, a zigbee signal, a lora signal, a NBiot narrowband Internet of Things signal, a 4G LTE broadband Internet of Things cat2 or cat3 or cat4 signal, and a 2.4G private protocol signal.

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