Charging pile output cable creepage detection circuit

Abstract

The utility model provides a creepage detection circuit for an output cable of a charging pile, and belongs to the technical field of creepage detection. The creepage detection circuit for the output cable of the charging pile comprises a creepage detection module, a charging detection module, a charging control module and a power supply, a first end of the creepage detection module is used for connecting a live wire, a second end of the creepage detection module is connected with a first input end of the charging control module, a third end of the creepage detection module is connected with a first end of the charging detection module, a second end of the charging detection module is connected with a power supply, and four ends of the creepage detection module are used for connecting the control module; the second input end of the charging control module is used for connecting a zero line, the control end of the charging control module is used for connecting the control module, the first output end of the charging control module serves as a live line output end, and the second output end of the charging control module serves as a zero line output end. The safety of the charging process of the charging pile can be improved.

Description

Technical Field

[0001] This application relates to the field of creepage detection technology, and particularly to a creepage detection circuit for the output cable of a charging pile. Background Art

[0002] At present, with the rapid development of new energy vehicles, the safe and stable operation of charging piles is of vital importance. During the use of existing charging piles, there are many potential safety hazards in their output cables. With the increase in service life, the change in ambient temperature, and the increase in the number of times the cables are stacked, the rubber sheaths of the output cables are prone to aging and cracking. The aged rubber sheaths will absorb moisture in the air, which will greatly affect the insulation performance of the cables. In severe cases, creepage may occur between the positive and negative poles of the output of a DC charging pile. Once creepage occurs, it is very likely to cause the cable to catch fire and burn, which will further lead to serious safety accidents, not only damaging the charging pile and the vehicle, but also endangering the lives of personnel. Summary of the Utility Model

[0003] An embodiment of this application provides a creepage detection circuit for the output cable of a charging pile to improve the safety of the charging process of the charging pile.

[0004] An embodiment of this application provides a creepage detection circuit for the output cable of a charging pile, including: a creepage detection module, a charging detection module, a charging control module, and a power supply;

[0005] The first end of the creepage detection module is used to connect to the live wire, the second end of the creepage detection module is connected to the first input end of the charging control module, the third end of the creepage detection circuit is connected to the first end of the charging detection module, the second end of the charging detection module is connected to the power supply, and the fourth end of the creepage detection module is used to connect to the control module;

[0006] The second input end of the charging control module is used to connect to the neutral wire, the control end of the charging control module is used to connect to the control module, the first output end of the charging control module serves as the live wire output end, and the second output end of the charging control module serves as the neutral wire output end.

[0007] In an exemplary embodiment of this application, the creepage detection module includes: a current sensor U1, a resistor R3, a resistor R4, a resistor R1, a resistor R2, and an operational amplifier U2;

[0008] The first end of the current sensor U1 is used to connect to the live wire. The second end of the current sensor U1 is connected to the first input end of the charging control module. The third end of the current sensor U1 is grounded through the resistor R4. The third end of the current sensor U1 is connected to the first end of the resistor R1 through the resistor R3. The second end of the resistor R1 is connected to the non-inverting input end of the operational amplifier U2. The third end of the current sensor U1 is connected to the inverting input end of the operational amplifier U2. The output end of the operational amplifier U2 is connected to the inverting input end of the operational amplifier U2 through the resistor R2. The output end of the operational amplifier U2 is used to connect to the control module;

[0009] The power supply end of the operational amplifier U2 is connected to the first end of the charging detection module, and the ground end of the operational amplifier U2 is grounded.

[0010] In an exemplary embodiment of the present application, the creepage detection module further includes: a resistor R5 and an optocoupler U4;

[0011] The first end of the resistor R5 is connected to the output end of the operational amplifier U2. The second end of the resistor R5 is connected to the first end of the optocoupler U4. The second end of the optocoupler U4 is grounded. The third end of the optocoupler U4 is connected to the 3.3V power supply. The fourth end of the optocoupler U4 is used to connect to the control module.

[0012] In an exemplary embodiment of the present application, the charging detection module includes: a microswitch SW1 and a triode Q1; The power supply includes: a 12V power supply;

[0013] The microswitch SW1 is disposed on the charging gun. The first end of the microswitch SW1 is connected to the 12V power supply. The second end of the microswitch SW1 is connected to the base of the triode Q1. The collector of the triode Q1 is connected to the 12V power supply. The emitter of the triode Q1 is connected to the second end of the charging detection module.

[0014] In an exemplary embodiment of the present application, the charging detection module further includes: a resistor R7 and a capacitor C8;

[0015] The first end of the resistor R7 is connected to the second end of the microswitch SW1. The second end of the resistor R7 is grounded through the capacitor C8. The second end of the resistor R7 is connected to the base of the triode Q1.

[0016] In an exemplary embodiment of the present application, the charging control module includes: a driver U3, a relay KM1 and a relay KM2;

[0017] The first input terminal and the second input terminal of the driver U3 are both used to connect to the control module. The first output terminal of the driver U3 is connected to the first end of the relay KM1, and the second end of the relay KM1 is connected to the second output terminal of the driver U3;

[0018] The second output terminal of the driver U3 is connected to the first end of the relay KM2, and the second end of the relay KM2 is connected to the first output terminal of the driver U3;

[0019] The third end of the relay KM1 is used to connect to the neutral line, and the fourth end of the relay KM1 serves as the neutral line output terminal;

[0020] The third end of the relay KM2 is connected to the second end of the creepage detection module, and the fourth end of the relay KM2 serves as the live line output terminal.

[0021] In an exemplary embodiment of the present application, the charging control module further includes: a capacitor C6 and a capacitor C7;

[0022] The capacitor C6 is connected in parallel with the first end and the second end of the relay KM1, and the capacitor C7 is connected in parallel with the first end and the second end of the relay KM2.

[0023] In an exemplary embodiment of the present application, it further includes: an alarm module;

[0024] The alarm module is connected to the fourth end of the creepage detection module.

[0025] The beneficial effects of a creepage detection circuit for a charging pile output cable provided by an embodiment of the present application are as follows: Through the charging detection module, the present application can accurately judge the connection status between the charging gun and the vehicle charging interface, and only trigger subsequent detections when the connection is normal, improving the pertinence and accuracy of the detection. The creepage detection module monitors in real time whether there is a creepage problem in the output cable. Once an abnormality is found, it can avoid safety accidents during the charging process. When the cable is normal, the creepage detection module outputs a signal to the control module, and the control module then controls the charging control module to close the switch to provide a charging power supply for the vehicle, ensuring the safety and reliability of the charging process. It effectively reduces safety risks, protects the charging pile, the vehicle and personnel safety, and at the same time ensures the smooth progress of the charging process. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a schematic structural diagram of a creepage detection circuit for a charging pile output cable provided by an embodiment of the present application;

[0028] Figure 2 It is a circuit diagram of a creepage detection circuit for a charging pile output cable provided by an embodiment of the present application. Specific embodiments

[0029] In order to enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below in conjunction with the accompanying drawings in the embodiments of this solution. Obviously, the described embodiments are part of the embodiments of this solution, rather than all of the embodiments. Based on the embodiments in this solution, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this solution.

[0030] The term "including" in the specification, claims and above-mentioned drawings of this solution, as well as any other deformation, means "including but not limited to", and is intended to cover non-exclusive inclusion, not limited to the examples listed in the text. In addition, terms such as "first" and "second" are used to distinguish different objects, rather than to describe a specific order.

[0031] The implementation of the present application will be described in detail below in conjunction with specific drawings:

[0032] Figure 1 It is a schematic structural diagram of a creepage detection circuit for a charging pile output cable provided by an embodiment of the present application. Refer to Figure 1 This creepage detection circuit for a charging pile output cable includes: a creepage detection module, a charging detection module, a charging control module, and a power supply;

[0033] The first end of the creepage detection module is used to connect to the live wire, the second end of the creepage detection module is connected to the first input end of the charging control module, the third end of the creepage detection circuit is connected to the first end of the charging detection module, the second end of the charging detection module is connected to the power supply, and the fourth end of the creepage detection module is used to connect to the control module;

[0034] The second input end of the charging control module is used to connect to the neutral wire, the control end of the charging control module is used to connect to the control module, the first output end of the charging control module serves as the live wire output end, and the second output end of the charging control module serves as the neutral wire output end.

[0035] In this embodiment, the charging detection module is used to detect whether the charging gun is normally connected to the charging interface of the charging vehicle, which can be achieved by detecting the circuit connection state at the charging interface. If the charging gun is normally connected to the charging interface of the charging vehicle, the charging detection module can inform this information to the creepage detection module to enable it to enter the working state.

[0036] After the charging gun is properly connected to the vehicle charging interface, the creepage detection module starts to detect whether the output cable of the charging pile is normal. The creepage detection module can determine whether there is a creepage phenomenon in the cable by detecting the electric field around the cable, the current leakage situation, or other physical quantities related to creepage. If the output cable of the charging pile is normal, the creepage detection module will output a corresponding electrical signal to the control module. This electrical signal can be a specific voltage, current value, or digital signal, used to inform the control module that the cable is in good condition.

[0037] After receiving the electrical signal indicating that the cable is normal sent by the creepage detection module, the control module outputs a control signal to the charging control module. This control signal is used to control the working state of the charging control module.

[0038] The charging control module receives the control signal output by the control module. When receiving the control signal indicating that the cable is normal, the switch inside the charging control module closes. At this time, the first output terminal of the charging control module serves as the live wire output terminal, and the second output terminal serves as the neutral wire output terminal, providing a charging power supply for the electric vehicle, thereby realizing the normal charging of the electric vehicle.

[0039] If at any time, the charging detection module detects that the charging gun is not properly connected to the vehicle charging interface, or the creepage detection module detects abnormal conditions such as creepage in the output cable of the charging pile, the creepage detection module will not send a normal signal to the control module, and the control module will not send an enabling signal to the charging control module. The switch inside the charging control module remains open and will not provide a charging power supply for the electric vehicle, thus avoiding potential safety hazards and equipment damage caused by cable faults or poor connection of the charging gun.

[0040] In this embodiment, the charging detection module can accurately judge the connection status between the charging gun and the vehicle charging interface, and only triggers subsequent detections when the connection is normal, improving the pertinence and accuracy of the detection. The creepage detection module monitors in real time whether there is a creepage problem in the output cable. Once an abnormality is found, it can avoid safety accidents during the charging process. When the cable is normal, the creepage detection module outputs a signal to the control module, and the control module then controls the charging control module to close the switch, providing a charging power supply for the vehicle, ensuring the safety and reliability of the charging process. It effectively reduces safety risks, protects the charging pile, vehicle, and personnel safety, and at the same time ensures the smooth progress of the charging process.

[0041] As Figure 2 shown, further, the creepage detection module includes: current sensor U1, resistor R3, resistor R4, resistor R1, resistor R2, and operational amplifier U2;

[0042] The first terminal of the current sensor U1 is used to connect to the live wire. The second terminal of the current sensor U1 is connected to the first input terminal of the charging control module. The third terminal of the current sensor U1 is grounded through the resistor R4. The third terminal of the current sensor U1 is connected to the first terminal of the resistor R1 through the resistor R3. The second terminal of the resistor R1 is connected to the non-inverting input terminal of the operational amplifier U2. The third terminal of the current sensor U1 is connected to the inverting input terminal of the operational amplifier U2. The output terminal of the operational amplifier U2 is connected to the inverting input terminal of the operational amplifier U2 through the resistor R2. The output terminal of the operational amplifier U2 is used to connect to the control module. The power supply terminal of the operational amplifier U2 is connected to the first terminal of the charging detection module, and the ground terminal of the operational amplifier U2 is grounded.

[0043] In this embodiment, the current sensor U1 is connected in series in the live wire. When the charging pile output cable is working normally, the current flowing through the live wire is the normal current for charging the electric vehicle. Once the cable shows problems such as rubber aging and cracking, resulting in creepage, the current in the live wire will change abnormally. The function of the current sensor U1 is to monitor the current situation in the live wire in real time.

[0044] The current sensor U1 converts the detected current signal into a voltage signal. The voltage signal output from its third terminal reflects the magnitude of the current in the live wire. The third terminal of the current sensor U1 is grounded through the resistor R4 and is also connected to the first terminal of the resistor R1 through the resistor R3. The resistor R4 plays a role in current limiting to ensure that the voltage output by the current sensor is within an appropriate range.

[0045] The operational amplifier U2 can process the input voltage signal. The power supply terminal of the operational amplifier U2 is connected to the first terminal of the charging detection module, which provides the working power supply for it. Its ground terminal is grounded, ensuring a normal working environment for the operational amplifier U2. The operational amplifier U2 constitutes an amplifier. The output terminal of the operational amplifier U2 is connected to its inverting input terminal through the resistor R2, which forms a negative feedback circuit to stabilize the gain of the amplifier.

[0046] The voltage signal amplified by the operational amplifier U2 is output from its output terminal and is used to connect to the control module. The control module can judge whether there is a creepage phenomenon in the charging pile output cable according to the magnitude of the received voltage signal. If the voltage signal exceeds the preset threshold, it indicates that the current in the live wire has changed abnormally, and there may be a creepage situation. The control module can take corresponding measures, such as cutting off the charging circuit, to avoid the occurrence of safety accidents.

[0047] As Figure 2 shown, further, the creepage detection module further includes: a resistor R5 and an optocoupler U4;

[0048] The first end of resistor R5 is connected to the output end of operational amplifier U2, the second end of resistor R5 is connected to the first end of optocoupler U4, the second end of optocoupler U4 is grounded, the third end of optocoupler U4 is connected to a 3.3V power supply, and the fourth end of optocoupler U4 is used to connect to the control module.

[0049] In this embodiment, the main function of the optocoupler is to achieve electrical isolation. The light emitted by the internal light-emitting diode of optocoupler U4 will irradiate the light-receiving element on the output side. The third end of optocoupler U4 is connected to a 3.3V power supply to provide a working power supply for the light-receiving element on the output side. When the light-emitting diode on the input side emits light, the light-receiving element on the output side generates a corresponding electrical signal according to the intensity of the light. Optocoupler U4 electrically isolates the input side and the output side, which can effectively prevent factors such as high voltage and interference on the output side from affecting the input-side circuit, and also prevent abnormal signals on the input side from damaging the output-side control module.

[0050] The electrical signal converted from the input-side signal by the output side of optocoupler U4 is transmitted to the control module. The control module can judge whether there is a creepage phenomenon in the charging cable of the charging pile according to the received signal. For example, if the received signal exceeds the preset threshold, it indicates that the live wire current is abnormal and there is a creepage situation. The control module can take corresponding protection measures to ensure the safety of the charging pile and the vehicle.

[0051] As Figure 2 shown, further, the charging detection module includes: microswitch SW1 and triode Q1; the power supply includes: a 12V power supply;

[0052] Microswitch SW1 is arranged on the charging gun. The first end of microswitch SW1 is connected to a 12V power supply, the second end of microswitch SW1 is connected to the base of triode Q1, the collector of triode Q1 is connected to a 12V power supply, and the emitter of triode Q1 is connected to the second end of the charging detection module.

[0053] In this embodiment, when the charging gun is not connected to the charging interface of the electric vehicle, microswitch SW1 is in an open state. At this time, no current flows into the base of triode Q1, and triode Q1 is in a cut-off state. Since triode Q1 is cut off, no current is output from its emitter, the power supply terminal of operational amplifier U2 cannot be powered, operational amplifier U2 does not work, and the creepage detection module is also in a non-working state.

[0054] When the charging gun is connected to the charging interface of the electric vehicle, microswitch SW1 arranged on the charging gun will close. Because the first end of microswitch SW1 is connected to a 12V power supply and the second end is connected to the base of triode Q1, after microswitch SW1 closes, the 12V power supply will provide current to the base of triode Q1 through the closed microswitch SW1.

[0055] The emitter of the triode Q1 is connected to the power supply terminal of the operational amplifier U2. When the triode Q1 conducts, the voltage output by the emitter supplies power to the operational amplifier U2. After the operational amplifier U2 obtains power supply, it starts to work normally, and then the creepage detection module enters the working state. The current sensor U1 in the creepage detection module starts to detect the live wire current, and the subsequent signal processing and amplification circuits also start to operate to detect whether there is a creepage phenomenon in the output cable of the charging pile.

[0056] In this embodiment, the charging detection module senses the connection state between the charging gun and the electric vehicle charging interface through the microswitch SW1, and controls the power supply of the operational amplifier U2 by the conduction and cut-off of the triode Q1, so as to realize the control of the working state of the creepage detection module, ensuring that the creepage detection is only carried out when the charging gun is normally connected, improving the safety and reliability of the charging pile.

[0057] As Figure 2 shown, further, the charging detection module further includes: a resistor R7 and a capacitor C8;

[0058] The first end of the resistor R7 is connected to the second end of the microswitch SW1, the second end of the resistor R7 is grounded through the capacitor C8, and the second end of the resistor R7 is connected to the base of the triode Q1.

[0059] In this embodiment, when the charging gun is connected to the charging interface of the electric vehicle, the microswitch SW1 closes, and the 12V power supply starts to supply power to the circuit composed of the resistor R7 and the capacitor C8 through the closed microswitch SW1.

[0060] At the moment of connection, the voltage across the capacitor C8 cannot change suddenly, which is equivalent to a short circuit. At this time, the current will first charge the capacitor C8. The resistor R7 plays a current limiting role. It limits the magnitude of the charging current and avoids too large a current directly impacting the base of the triode Q1 at the moment when the microswitch SW1 closes. Without the current limiting of the resistor R7, too large a current may damage the triode Q1, resulting in its abnormal operation.

[0061] When the capacitor C8 is fully charged, it is equivalent to an open circuit. At this time, the base voltage of the triode Q1 is provided by the 12V power supply after being divided by the resistor R7, and the triode Q1 enters a stable conduction state. In this stable state, the resistor R7 and the capacitor C8 still play a certain filtering role.

[0062] The capacitor C8 can bypass the high-frequency interference signals in the power supply and introduce them to the ground, thus ensuring the stability of the base voltage of the triode Q1. And the resistor R7 can further limit the possible abnormal current and prevent the triode Q1 from being damaged due to current mutations caused by external interference and other factors.

[0063] As Figure 2As shown in the figure, further, the charging control module includes: driver U3, relay KM1, and relay KM2;

[0064] Both the first input terminal and the second input terminal of driver U3 are used to connect to the control module. The first output terminal of driver U3 is connected to the first end of relay KM1, and the second end of relay KM1 is connected to the second output terminal of driver U3;

[0065] The second output terminal of driver U3 is connected to the first end of relay KM2, and the second end of relay KM2 is connected to the first output terminal of driver U3;

[0066] The third end of relay KM1 is used to connect to the neutral line, and the fourth end of relay KM1 serves as the neutral line output terminal;

[0067] The third end of relay KM2 is connected to the second end of the creepage detection module, and the fourth end of relay KM2 serves as the live wire output terminal.

[0068] In this embodiment, the control module determines whether the charging pile output cable is normal according to the signal output by the creepage detection module. When the cable is normal, the control module sends a corresponding control signal to driver U3; if there are abnormal conditions such as creepage in the cable, the control module sends a signal to prohibit charging.

[0069] After receiving the control signal from the control module, driver U3 processes and amplifies the signal to generate sufficient power to drive relays KM1 and KM2. The first output terminal and the second output terminal of driver U3 output corresponding levels according to different control signals, thereby controlling the actions of relays KM1 and KM2.

[0070] When the control module determines that the charging pile output cable is normal and sends an allow - charging control signal to driver U3, the first output terminal and the second output terminal of driver U3 output appropriate levels to make relays KM1 and KM2 close.

[0071] For relay KM1, its first end and second end are respectively connected to the first output terminal and the second output terminal of driver U3. After closing, its third end (connected to the neutral line) and the fourth end (serving as the neutral line output terminal) are conducted, introducing the neutral line to the output terminal of the charging pile to provide a neutral line circuit for charging the electric vehicle. For relay KM2, its first end and second end are also connected to the corresponding output terminals of driver U3. After closing, its third end (connected to the second end of the creepage detection module, that is, the live wire after creepage detection) and the fourth end (serving as the live wire output terminal) are conducted, introducing the detected live wire to the output terminal of the charging pile to provide a live wire power supply for charging the electric vehicle. In this way, the charging pile can charge the electric vehicle normally.

[0072] When the control module determines that there are abnormal conditions such as creepage in the charging pile output cable, it sends a control signal to prohibit charging to the driver U3. After receiving this signal, the output terminal of the driver U3 changes its level, causing the relays KM1 and KM2 to disconnect. At this time, the third and fourth terminals of relay KM1 and the third and fourth terminals of relay KM2 are all in the disconnected state, and there is no power output at the live wire output terminal and the neutral wire output terminal of the charging pile, thus avoiding charging under abnormal cable conditions and ensuring the safety of the charging process.

[0073] As Figure 2 shown, further, the charging control module further includes: capacitor C6 and capacitor C7;

[0074] Capacitor C6 is connected in parallel with the first and second terminals of relay KM1, and capacitor C7 is connected in parallel with the first and second terminals of relay KM2.

[0075] In this embodiment, when the current in the relay coil suddenly changes, a self-induced electromotive force opposite to the original current direction will be generated, and this self-induced electromotive force may cause a very high voltage spike across the relay coil.

[0076] Capacitor C6 is connected in parallel with the first and second terminals of relay KM1, and capacitor C7 is connected in parallel with the first and second terminals of relay KM2. At the moment when the relay is energized or de-energized, the generated voltage spike can be absorbed by the capacitor. The capacitor has the characteristics of storing and releasing charge. When the voltage spike appears, the capacitor will quickly charge and store the excess electrical energy, thereby reducing the voltage peak across the relay coil and avoiding damage to the driver U3 and the relay itself caused by excessive voltage.

[0077] As Figure 1 shown, further, it further includes: an alarm module; the alarm module is connected to the fourth terminal of the creepage detection module.

[0078] In this embodiment, the creepage detection module continuously monitors the insulation state of the charging pile output line to determine whether there is current leakage (creepage) phenomenon. When creepage occurs in the line, the internal circuit of the creepage detection module will change accordingly, resulting in a specific signal being output at its fourth terminal, and this signal is used to indicate the occurrence of creepage. The alarm module is connected to the fourth terminal of the creepage detection module and receives the signal from the creepage detection module in real time. When the alarm module receives the signal indicating creepage from the fourth terminal of the creepage detection module, it immediately activates the alarm mechanism.

[0079] The alarm module can be alarm components such as sound-emitting and light-emitting components. Once triggered, the alarm module emits an alarm signal through these components, such as emitting a loud sound or flashing lights, to attract the attention of staff or users, indicating that a creeping discharge fault has occurred in the charging pile, and timely maintenance and handling are required, thus avoiding safety accidents caused by creeping discharge and ensuring the safety of personnel and equipment.

[0080] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims

1. A charging pile output cable creepage detection circuit, characterized in that: include: Creepage detection module, charging detection module, charging control module and power supply; The first end of the creepage detection module is used to connect to the live wire, the second end of the creepage detection module is connected to the first input end of the charging control module, the third end of the creepage detection circuit is connected to the first end of the charging detection module, the second end of the charging detection module is connected to the power supply, and the fourth end of the creepage detection module is used to connect to the control module; The second input end of the charging control module is used to connect the neutral line, the control end of the charging control module is used to connect the control module, the first output end of the charging control module is used as the live line output end, and the second output end of the charging control module is used as the neutral line output end.

2. A charging pile output cable creepage detection circuit as claimed in claim 1, characterized in that: The creepage detection module includes: a current sensor U1, a resistor R3, a resistor R4, a resistor R1, a resistor R2 and an operational amplifier U2; The first end of the current sensor U1 is used to connect to the live wire, the second end of the current sensor U1 is connected to the first input end of the charging control module, the third end of the current sensor U1 is grounded through the resistor R4, the third end of the current sensor U1 is connected to the first end of the resistor R1 through the resistor R3, the second end of the resistor R1 is connected to the non-inverting input end of the operational amplifier U2, the third end of the current sensor U1 is connected to the inverting input end of the operational amplifier U2, the output end of the operational amplifier U2 is connected to the inverting input end of the operational amplifier U2 through the resistor R2, and the output end of the operational amplifier U2 is used to connect to the control module; The power supply terminal of the operational amplifier U2 is connected to the first terminal of the charging detection module, and the ground terminal of the operational amplifier U2 is grounded.

3. A charging pile output cable creepage detection circuit as claimed in claim 2, characterized in that: The creepage detection module also includes: a resistor R5 and an optical coupler U4; The first end of the resistor R5 is connected to the output end of the operational amplifier U2, the second end of the resistor R5 is connected to the first end of the optocoupler U4, the second end of the optocoupler U4 is grounded, the third end of the optocoupler U4 is connected to a 3.3V power supply, and the fourth end of the optocoupler U4 is used to connect to a control module.

4. A charging pile output cable creepage detection circuit as claimed in claim 1, characterized in that: The charging detection module includes: a micro switch SW1 and a transistor Q1; the power supply includes: a 12V power supply; The micro switch SW1 is arranged on the charging gun, the first end of the micro switch SW1 is connected to the 12V power supply, the second end of the micro switch SW1 is connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to the 12V power supply, and the emitter of the transistor Q1 is connected to the second end of the charging detection module.

5. A charging pile output cable creepage detection circuit as claimed in claim 4, characterized in that: The charging detection module also includes: a resistor R7 and a capacitor C8; The first end of the resistor R7 is connected to the second end of the micro switch SW1 , the second end of the resistor R7 is grounded via the capacitor C8 , and the second end of the resistor R7 is connected to the base of the transistor Q1 .

6. A charging pile output cable creepage detection circuit as claimed in claim 1, characterized in that: The charging control module includes: a driver U3, a relay KM1 and a relay KM2; The first input terminal and the second input terminal of the driver U3 are both used to connect to the control module, the first output terminal of the driver U3 is connected to the first terminal of the relay KM1, and the second terminal of the relay KM1 is connected to the second output terminal of the driver U3; The second output end of the driver U3 is connected to the first end of the relay KM2, and the second end of the relay KM2 is connected to the first output end of the driver U3; The third end of the relay KM1 is used to connect the neutral line, and the fourth end of the relay KM1 serves as the neutral line output end; The third end of the relay KM2 is connected to the second end of the creepage detection module, and the fourth end of the relay KM2 serves as a live wire output end.

7. A charging pile output cable creepage detection circuit as claimed in claim 6, characterized in that: The charging control module further includes: a capacitor C6 and a capacitor C7; The capacitor C6 is connected in parallel with the first end and the second end of the relay KM1 , and the capacitor C7 is connected in parallel with the first end and the second end of the relay KM2 .

8. A charging pile output cable creepage detection circuit as claimed in claim 1, characterized in that: Also includes: Alarm module; The alarm module is connected to the fourth end of the creepage detection module.

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