New energy automobile charging device

Abstract

The utility model relates to the technical field of detection, in particular to a new energy automobile charging device, which comprises a charging socket, a charging protection device and a charging gun, and is characterized in that the charging protection device comprises a multi-voltage power supply module, a microcontroller, a voltage detection module and a circuit protection module; the microcontroller is connected with the multi-voltage power supply module, the voltage detection module and the circuit protection module; the multi-voltage power supply module is used for acquiring charging power and converting the charging power into power required by each module; the input end of the voltage detection module is connected between a live wire and a zero wire of a charging cable in parallel, the output end of the voltage detection module is connected with the microcontroller so as to detect voltage data in the charging process and transmit the voltage data to the microcontroller, and the circuit protection module carries out charging switching action. Therefore, the charging process of the charging device is protected, and the safety of the new energy automobile charging device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of distance measurement, in particular to a new energy vehicle charging device. Background Art

[0002] With the development of fossil fuels and the internal combustion engine, automobiles have become the primary means of transportation in households. Whether traveling or transporting goods, cars occupy a significant share of the market. The mobility and flexibility of automobiles are irreplaceable by rail and air transportation. Currently, the majority of vehicles still use fossil fuels such as gasoline and diesel as their energy source, with internal combustion engines converting energy to power the vehicle. However, internal combustion vehicles suffer from significant energy waste and pollution, particularly during low-speed operation in cities and when large trucks are operating at full capacity. Internal combustion engines cannot fully burn fuel, resulting in significant fossil fuel loss and harmful gas emissions. Pollutants in vehicle exhaust include suspended solid particles, CO, CO2, hydrocarbons, NO, lead, and sulfur oxides. These gases are harmful to health and exacerbate the greenhouse effect. Therefore, the vigorous development of new energy vehicles is essential. They have a significant positive impact on environmental governance and energy conservation and emission reduction.

[0003] Therefore, the proportion of new energy vehicles in the current market is increasing. With the popularization of electric vehicles, the facilities related to electric vehicle charging are also gradually increasing. Currently, there are many modes for charging vehicles. In order to make the charging of new energy vehicles safer, the detection of some parameters during the charging process, such as voltage signals, has become one of the important means to avoid dangers. Summary of the Invention

[0004] In order to solve the technical problems existing in the above-mentioned background technology, the utility model provides a new energy vehicle charging device, which avoids overvoltage or undervoltage by accurately detecting the charging voltage signal, thereby helping to improve the safety of the new energy vehicle charging device.

[0005] In order to achieve the above technical solution, in a first aspect, the utility model provides a new energy vehicle charging device, comprising: a charging socket connected to a charging power source, a charging protection device, and a charging gun connected to the new energy vehicle, wherein the charging protection device comprises: a multi-voltage power supply module, a microcontroller, a voltage detection module, and a circuit protection module;

[0006] The microcontroller is connected to the multi-voltage power supply module, the voltage detection module, and the circuit protection module;

[0007] The multi-voltage power module includes an input terminal and multiple output terminals. The input terminal of the multi-voltage power module is electrically connected to the live and neutral wires of the charging cable to obtain charging power. The output terminal is connected to the microcontroller, voltage detection module, current detection module, circuit protection module, and leakage detection module to provide the required power for the above modules.

[0008] The multi-voltage power supply module is communicatively connected with the microcontroller;

[0009] The input end of the voltage detection module is connected in parallel between the live wire and the neutral wire of the charging cable, and the output end of the voltage detection module is connected to the microcontroller;

[0010] The circuit protection module includes a first relay and a first relay drive circuit and a second relay and a second relay drive circuit; the first relay includes a first coil and a first switch connected in series to the live wire; the second relay includes a second coil and a second switch connected in series to the neutral wire; the input end of the first relay drive circuit and the input end of the second relay drive circuit are both connected to the microcontroller, the first relay drive circuit is used to drive the first relay to perform a switching action; the second relay drive circuit is used to drive the second relay to perform a switching action.

[0011] Furthermore, the voltage detection module includes: a voltage transformer T1; the voltage transformer T1 is connected in parallel between the live wire and the neutral wire, and a self-resetting fuse FU1 and a first resistor R1 are connected in series on the output end connected to the live wire;

[0012] The output end of the voltage transformer T1 is connected to the positive input end of the first operational amplifier U1 through the second resistor R2, and the negative input end of the first operational amplifier U1 is connected to the first end of the third resistor R3 and the first end of the fourth resistor R4; the second end of the third resistor R3 is grounded; the output end of the first operational amplifier U1 is connected to the positive electrode of the first diode D1; the negative electrode of the first diode D1 is connected to the second end of the fourth resistor R4 and the positive input end of the follower U2; the negative input end of the follower U2 is connected to the output end of the follower U2; the output end of the follower U2 is also connected to the first end of the fifth resistor R5; the second end of the fifth resistor R5 is connected to the microcontroller and the first end of the first capacitor C1; the second end of the first capacitor C1 is grounded.

[0013] Furthermore, the first relay drive circuit includes: a sixth resistor R6; a first end of the sixth resistor R6 is connected to the microprocessor and the first end of the seventh resistor R7; a second end of the sixth resistor R6 is connected to the first power supply VCC1; a second end of the seventh resistor R7 is connected to the base of the first transistor Q1; a collector of the first transistor Q1 is connected to the first end of the eighth resistor R8 and the base of the second transistor Q2; a second end of the eighth resistor R8 is connected to the first power supply VCC1; a collector of the second transistor Q2 is connected to the input end of the first coil and the anode of the second diode D2; the emitter of the second transistor Q2 and the emitter of the first transistor Q1 are both grounded; the output end of the first coil and the cathode of the second diode D2 are both connected to the first end of the ninth resistor R9, and the second end of the ninth resistor R9 is connected to the first power supply VCC1.

[0014] Furthermore, the charging protection device further includes: a leakage detection module, wherein the leakage detection module includes a leakage current sensor T3; the leakage current sensor T3 passes through the live wire and the neutral wire to detect the leakage current;

[0015] The first output terminal of the leakage current sensor T3 is connected to the first end of the fourteenth resistor R14; the second end of the leakage current sensor T3 is connected to the first end of the sixteenth resistor R16; the second end of the fourteenth resistor R14 is connected to the first end of the second capacitor C2 and the first end of the fifteenth resistor R15; the second end of the second capacitor C2 and the first end of the fourth capacitor C4 are both grounded; the second end of the fourth capacitor C4 is connected to the second end of the sixteenth resistor R16 and the first end of the seventeenth resistor R17; the second end of the fifteenth resistor R15 is connected to the negative input terminal of the second operational amplifier U2, the first end of the sixth capacitor C6 and the eighteenth resistor R18 The first end of the seventeenth resistor R17 is connected; the second end of the seventeenth resistor R17 is connected to the first end of the nineteenth resistor R19, the first end of the third capacitor C3 and the positive input end of the second operational amplifier U2; the second end of the nineteenth resistor R19 and the second end of the third capacitor C3 are grounded; the second end of the eighteenth resistor R18 and the second end of the sixth capacitor C6 are connected to the output end of the second operational amplifier U2 and the first end of the twentieth resistor R20; the second end of the twentieth resistor R20 is connected to the first end of the fifth capacitor C5 and the output end of the leakage detection module; the second end of the fifth capacitor C5 is grounded; the output end of the leakage detection module is connected to the microcontroller.

[0016] Furthermore, the charging protection device further includes: a current detection module, and the current detection module includes: a current transformer T2, a detection circuit, a first filter circuit, an isolation switch circuit and a second filter circuit.

[0017] Furthermore, the current transformer T2 passes through the live wire to detect current data, and the current transformer includes a first output terminal and a second output terminal;

[0018] The first end of the twenty-fourth resistor R24 ​​is connected to the first output end of the current transformer, the first end of the twenty-fifth resistor, and the first end of the sixth capacitor C6. The second end of the twenty-fourth resistor R24 ​​is connected to the second output end of the current transformer, the second end of the sixth capacitor C6, and ground. The second end of the twenty-fifth resistor R25 is connected to the first input end A of the optocoupler U4. The second end of the sixth capacitor C6 is connected to the second input end K of the optocoupler U4. The first output end C of the optocoupler U4 is connected to the first end of the twenty-sixth resistor R26 and the first end of the twenty-seventh resistor R27. The second output end E of the optocoupler U4 is connected to the second power supply VCC2. The second end of the twenty-sixth resistor R26 is grounded. The second end of the twenty-seventh resistor R27 is connected to the first end of the seventh capacitor C7 and the output end of the current detection module. The second end of the seventh capacitor C7 is connected to the second power supply VCC2. The output end of the current detection module is connected to the microcontroller.

[0019] The beneficial effects of the present invention are:

[0020] (1) The utility model accurately detects the charging voltage signal through the voltage detection module to avoid overvoltage or undervoltage. When overvoltage or undervoltage occurs, the circuit protection module is used to disconnect the charging by setting switches on the live wire and the neutral wire, thereby helping to improve the safety of the new energy vehicle charging device.

[0021] (2) The voltage detection module of the present invention connects the self-recovery fuse in series with the live wire, which helps to avoid the impact of voltage surges from the charging grid on the entire circuit, thereby improving the accuracy of voltage detection, helping to improve the detection accuracy of the microcontroller and improving the safety of the device.

[0022] (3) The current detection module in the present invention performs two filtering operations through the first filtering circuit and the second filtering circuit, and adopts an isolation switch circuit to realize isolated current detection, thereby improving the stability and reliability of current detection, avoiding the problem of poor accuracy caused by non-isolated detection, and thus helping to obtain stable current detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0024] Figure 1 This is a structural schematic diagram of a new energy vehicle charging device of the present utility model.

[0025] Figure 2 This is the electrical principle block diagram of a new energy vehicle charging device of the present utility model.

[0026] Figure 3 This is a circuit diagram of a voltage detection module of a new energy vehicle charging device of the present utility model.

[0027] Figure 4 This is a circuit diagram of a current detection module of a new energy vehicle charging device of the present utility model.

[0028] Figure 5 This is a circuit diagram of a leakage current module of a new energy vehicle charging device of the present utility model.

[0029] Figure 6 This is a circuit diagram of a circuit protection module of a new energy vehicle charging device of the present utility model.

[0030] Figure 7 This is a circuit diagram of a microcontroller of an embodiment of a new energy vehicle charging device of the present utility model. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, each technical and scientific term used in this embodiment has the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0034] In the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are merely relational words determined for the convenience of describing the structural relationships of the various parts or elements of the present invention, and do not specifically refer to any part or element in the present invention, and cannot be understood as a limitation on the present invention.

[0035] In this utility model, terms such as "fixed connection," "connected," and "connection" should be interpreted broadly to mean a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediary. Relevant researchers or technicians in this field may determine the specific meaning of these terms in this utility model based on specific circumstances, and they should not be construed as limiting this utility model.

[0036] Example 1:

[0037] like Figures 1 to 2 As shown, this embodiment provides a new energy vehicle charging device, including: a charging socket 1 connected to a power source, a charging protection device 3, a charging gun 4 connected to the new energy vehicle, and a cable 2 electrically connecting the charging plug, the charging protection device and the charging gun, wherein the cable includes a charging cable (specifically, a live wire, a neutral wire and a ground wire) and a communication cable for signal transmission; the charging protection device 3 includes: a multi-voltage power supply module 3-2, a microcontroller 3-1, a voltage detection module 3-3, a current detection module 3-4, a circuit protection module 3-6 and a leakage detection module 3-5. The microcontroller 3-1 is connected to the multi-voltage power supply module 3-2, the voltage detection module 3-3, the current detection module 3-4, the circuit protection module 3-6, and the leakage detection module 3-5. The multi-voltage power supply module 3-2 includes an input terminal and multiple output terminals. The input terminal of the multi-voltage power supply module 3-2 is connected to the charging cable, and the output terminal is connected to the microcontroller 3-1, the voltage detection module 3-3, the current detection module 3-4, the circuit protection module 3-6, and the leakage detection module 3-5 (for the sake of clarity and simplicity of the drawings, not shown) to provide the required power for the above modules. Among them, the microcontroller (MCU) can adopt an STM series single-chip microcomputer (such as Figure 7 shown).

[0038] The multi-voltage power supply module 3-2 is used to convert the acquired AC signal into multiple voltage signals with different voltage values; the multi-voltage power supply has an input end and multiple output ends. The input end of the multi-voltage power supply circuit is connected to the neutral wire and the live wire of the charging cable, and the output end of the multi-voltage power supply is respectively connected to the microcontroller, the circuit protection module and the pulse modulation module to provide the required power for each module.

[0039] The input end of the voltage detection module 3-3 is connected in parallel between the live wire and the neutral wire of the charging cable, and the output end of the voltage detection module is connected to the microcontroller to collect the voltage data of the charging cable and process the collected voltage data so that the microcontroller can determine whether there is overvoltage or undervoltage.

[0040] Specifically, if Figure 3As shown, the voltage detection module 3-3 includes: a voltage transformer T1; the voltage transformer T1 is connected in parallel between the live wire and the neutral wire, and a self-resetting fuse FU1 and a first resistor R1 are connected in series on the output end connected to the live wire; the output end of the voltage transformer T1 is connected to the positive input end of the first operational amplifier U1 through the second resistor R2, and the negative input end of the first operational amplifier U1 is connected to the first end of the third resistor R3 and the first end of the fourth resistor R4; the second end of the third resistor R3 is grounded; the output end of the first operational amplifier U1 is connected to the positive electrode of the first diode D1; the negative electrode of the first diode D1 is connected to the second end of the fourth resistor R4 and the positive input end of the follower U2; the negative input end of the follower U2 is connected to the output end of the follower U2; the output end of the follower U2 is also connected to the first end of the fifth resistor R5; the second end of the fifth resistor R5 is connected to the microcontroller (in this embodiment, connected to the GPIO_0 pin of the single-chip microcomputer) and the first end of the first capacitor C1; the second end of the first capacitor C1 is grounded. In this embodiment, the voltage transformer is a PT006 ​​voltage transformer; the first operational amplifier U1 is an OP07 operational amplifier; and the follower U2 is an LM258 follower.

[0041] The voltage detection module in this embodiment connects a resettable fuse in series with the live wire, which helps to prevent the impact of voltage surges from the charging grid on the entire circuit. In addition, the use of a voltage transformer helps to isolate interference between the front and rear stages, thereby improving the accuracy of voltage detection, helping to improve the detection accuracy of the microcontroller and improving the safety of the device.

[0042] like Figure 4 As shown, the current detection module 3-4 includes: a current transformer T2, a detection circuit, a first filter circuit, an isolation switch circuit, and a second filter circuit. The current transformer T2 passes through the live wire to detect current data, and the current transformer includes a first output terminal and a second output terminal.

[0043] The detection circuit includes a twenty-fourth resistor R24; a first end of the twenty-fourth resistor R24 ​​is connected to the first output end of the current transformer, the first end of the twenty-fifth resistor, and the first end of the sixth capacitor C6; a second end of the twenty-fourth resistor R24 ​​is connected to the second output end of the current transformer, the second end of the sixth capacitor C6, and ground. A second end of the twenty-fifth resistor R25 is connected to the first input end A of the optocoupler U4; a second end of the sixth capacitor C6 is connected to the second input end K of the optocoupler U4; a first output end C of the optocoupler U4 is connected to the first end of the twenty-sixth resistor R26 and the first end of the twenty-seventh resistor R27; a second output end E of the optocoupler U4 is connected to the second power supply VCC2; a second end of the twenty-sixth resistor R26 is grounded; a second end of the twenty-seventh resistor R27 is connected to the first end of the seventh capacitor C7 and the output end of the current detection module; a second end of the seventh capacitor C7 is connected to the second power supply VCC2; and the output end of the current detection module is connected to the microcontroller (in this embodiment, the output end of the current detection module is connected to the GPIO_2 interface of the microcontroller).

[0044] This embodiment performs two filtering operations using a first filtering circuit and a second filtering circuit, and uses an isolation switch circuit to achieve isolated current detection, thereby improving the stability and reliability of current detection, avoiding the problem of poor accuracy caused by non-isolated detection, and thus helping to obtain stable current detection results.

[0045] like Figure 6 As shown, the circuit protection module 3 - 6 includes a first relay and a first relay driving circuit and a second relay and a second relay driving circuit.

[0046] The first relay includes a first switch K1 and a first coil, and the first switch is connected in series to the live wire; the first relay drive circuit includes a sixth resistor R6; a first end of the sixth resistor R6 is connected to the microprocessor (in this embodiment, the first end of the sixth resistor R6 is connected to the GPIO_1 interface of the single-chip microcomputer) and a first end of a seventh resistor R7; a second end of the sixth resistor R6 is connected to the first power supply VCC1; a second end of the seventh resistor R7 is connected to the base of the first transistor Q1; a collector of the first transistor Q1 is connected to the first end of the eighth resistor R8 and the base of the second transistor Q2; a second end of the eighth resistor R8 is connected to the first power supply VCC1; a collector of the second transistor Q2 is connected to the input end of the first coil and the anode of the second diode D2; the emitter of the second transistor Q2 and the emitter of the first transistor Q1 are both grounded; the output end of the first coil and the cathode of the second diode D2 are both connected to the first end of the ninth resistor R9, and the second end of the ninth resistor R9 is connected to the first power supply VCC1.

[0047] The second relay includes a second switch K2 and a second coil, wherein the second switch K2 is connected in series to the neutral line. The second relay drive circuit includes a tenth resistor R10. A first end of the tenth resistor R10 is connected to the microprocessor (in this embodiment, the first end of the tenth resistor R10 is connected to the GPIO_1 interface of the single-chip microcomputer) and a first end of an eleventh resistor R11. A second end of the tenth resistor R10 is connected to the first power supply VCC1. A second end of the eleventh resistor R11 is connected to the base of the third transistor Q3. The collector of the third transistor Q3 is connected to the first end of the twelfth resistor R12 and the base of the fourth transistor Q4. The second end of the twelfth resistor R12 is connected to the first power supply VCC1. The collector of the fourth transistor Q4 is connected to the input end of the second coil and the anode of the third diode D3. The emitter of the third transistor Q3 and the emitter of the first transistor Q4 are both grounded. The output end of the second coil and the cathode of the third diode D3 are both connected to the first end of the thirteenth resistor R13, and the second end of the thirteenth resistor R13 is connected to the first power supply VCC1.

[0048] In this embodiment, freewheeling diodes are provided in both the first relay drive circuit and the second relay drive circuit (the second diode D2 in the first relay drive circuit and the third diode D3 in the second relay drive circuit). Because the relay operation mainly depends on the inductive main coil of the relay, transient high voltage may be generated during the shutdown process to damage the circuit. Therefore, freewheeling diodes D are provided at both ends of the relay so that the reverse electromotive force during the relay operation can be dissipated through the leakage circuit, thereby helping to avoid damage to the charging device and threats to personal safety.

[0049] like Figure 5As shown, the leakage detection module 3-5 includes a leakage current sensor T3; the leakage current sensor T3 passes through the live wire and the neutral wire to detect the leakage current; the first output end of the leakage current sensor T3 is connected to the first end of the fourteenth resistor R14; the second end of the leakage current sensor T3 is connected to the first end of the sixteenth resistor R16; the second end of the fourteenth resistor R14 is connected to the first end of the second capacitor C2 and the first end of the fifteenth resistor R15; the second end of the second capacitor C2 and the first end of the fourth capacitor C4 are both grounded; the second end of the fourth capacitor C4 is connected to the second end of the sixteenth resistor R16 and the first end of the seventeenth resistor R17; the second end of the fifteenth resistor R15 is connected to the negative input end of the second operational amplifier U2, the first end of the sixth capacitor C6 and the first end of the eighteenth resistor R17 The first end of the resistor R18 is connected; the second end of the seventeenth resistor R17 is connected to the first end of the nineteenth resistor R19, the first end of the third capacitor C3, and the positive input end of the second operational amplifier U2; the second end of the nineteenth resistor R19 and the second end of the third capacitor C3 are grounded; the second end of the eighteenth resistor R18 and the second end of the sixth capacitor C6 are connected to the output end of the second operational amplifier U2 and the first end of the twentieth resistor R20; the second end of the twentieth resistor R20 is connected to the first end of the fifth capacitor C5 and the output end of the leakage detection module; the second end of the fifth capacitor C5 is grounded; the output end of the leakage detection module is connected to the microcontroller (in this embodiment, the output end of the leakage detection module is connected to the GPIO_3 interface of the single-chip microcomputer).

[0050] It should be noted that the first power supply VCC1, the second power supply VCC2 and the power supply in the single chip microcomputer are all provided by a multi-voltage power supply module.

[0051] In this specification, the same or similar parts between the various embodiments can be referred to each other. In particular, for the terminal embodiment, since it is basically similar to the method embodiment, the description is simple to compare, and the relevant parts can be referred to the description in the method embodiment.

[0052] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. For maintenance personnel in this field, the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A new energy vehicle charging device, comprising: A charging socket connected to a charging power source, a charging protection device, and a charging gun connected to a new energy vehicle, wherein the charging protection device includes: a multi-voltage power supply module, a microcontroller, a voltage detection module, and a circuit protection module; The microcontroller is connected to the multi-voltage power supply module, the voltage detection module, and the circuit protection module; The multi-voltage power module includes an input terminal and multiple output terminals. The input terminal of the multi-voltage power module is electrically connected to the live and neutral wires of the charging cable to obtain charging power. The output terminal is connected to the microcontroller, voltage detection module, current detection module, circuit protection module, and leakage detection module to provide the required power for the above modules. The multi-voltage power supply module is communicatively connected with the microcontroller; The input end of the voltage detection module is connected in parallel between the live wire and the neutral wire of the charging cable, and the output end of the voltage detection module is connected to the microcontroller; The circuit protection module includes a first relay and a first relay drive circuit and a second relay and a second relay drive circuit; the first relay includes a first coil and a first switch connected in series to the live wire; the second relay includes a second coil and a second switch connected in series to the neutral wire; the input end of the first relay drive circuit and the input end of the second relay drive circuit are both connected to the microcontroller, the first relay drive circuit is used to drive the first relay to perform a switching action; the second relay drive circuit is used to drive the second relay to perform a switching action.

2. The new energy vehicle charging device according to claim 1, characterized in that: The voltage detection module includes: a voltage transformer T1; the voltage transformer T1 is connected in parallel between the live wire and the neutral wire, and a self-resetting fuse FU1 and a first resistor R1 are connected in series on the output end connected to the live wire; The output end of the voltage transformer T1 is connected to the positive input end of the first operational amplifier U1 through the second resistor R2, and the negative input end of the first operational amplifier U1 is connected to the first end of the third resistor R3 and the first end of the fourth resistor R4; the second end of the third resistor R3 is grounded; the output end of the first operational amplifier U1 is connected to the positive electrode of the first diode D1; the negative electrode of the first diode D1 is connected to the second end of the fourth resistor R4 and the positive input end of the follower U2; the negative input end of the follower U2 is connected to the output end of the follower U2; the output end of the follower U2 is also connected to the first end of the fifth resistor R5; the second end of the fifth resistor R5 is connected to the microcontroller and the first end of the first capacitor C1; the second end of the first capacitor C1 is grounded.

3. The new energy vehicle charging device according to claim 1, characterized in that: The first relay drive circuit includes: a sixth resistor R6; a first end of the sixth resistor R6 is connected to the microprocessor and the first end of the seventh resistor R7; a second end of the sixth resistor R6 is connected to the first power supply VCC1; a second end of the seventh resistor R7 is connected to the base of the first transistor Q1; a collector of the first transistor Q1 is connected to the first end of the eighth resistor R8 and the base of the second transistor Q2; a second end of the eighth resistor R8 is connected to the first power supply VCC1; a collector of the second transistor Q2 is connected to the input end of the first coil and the anode of the second diode D2; the emitter of the second transistor Q2 and the emitter of the first transistor Q1 are both grounded; the output end of the first coil and the cathode of the second diode D2 are both connected to the first end of the ninth resistor R9, and the second end of the ninth resistor R9 is connected to the first power supply VCC1.

4. The new energy vehicle charging device according to claim 1, characterized in that: The charging protection device further includes: a leakage detection module, wherein the leakage detection module includes a leakage current sensor T3; the leakage current sensor T3 passes through the live wire and the neutral wire to detect the leakage current; The first output terminal of the leakage current sensor T3 is connected to the first end of the fourteenth resistor R14; the second end of the leakage current sensor T3 is connected to the first end of the sixteenth resistor R16; the second end of the fourteenth resistor R14 is connected to the first end of the second capacitor C2 and the first end of the fifteenth resistor R15; the second end of the second capacitor C2 and the first end of the fourth capacitor C4 are both grounded; the second end of the fourth capacitor C4 is connected to the second end of the sixteenth resistor R16 and the first end of the seventeenth resistor R17; the second end of the fifteenth resistor R15 is connected to the negative input terminal of the second operational amplifier U2, the first end of the sixth capacitor C6 and the eighteenth resistor R18 The first end of the seventeenth resistor R17 is connected; the second end of the seventeenth resistor R17 is connected to the first end of the nineteenth resistor R19, the first end of the third capacitor C3 and the positive input end of the second operational amplifier U2; the second end of the nineteenth resistor R19 and the second end of the third capacitor C3 are grounded; the second end of the eighteenth resistor R18 and the second end of the sixth capacitor C6 are connected to the output end of the second operational amplifier U2 and the first end of the twentieth resistor R20; the second end of the twentieth resistor R20 is connected to the first end of the fifth capacitor C5 and the output end of the leakage detection module; the second end of the fifth capacitor C5 is grounded; the output end of the leakage detection module is connected to the microcontroller.

5. The new energy vehicle charging device according to claim 1, characterized in that: The charging protection device further includes a current detection module, which includes a current transformer T2, a detection circuit, a first filter circuit, an isolation switch circuit, and a second filter circuit.

6. The new energy vehicle charging device according to claim 5, characterized in that: The current transformer T2 passes through the live wire to detect current data, and the current transformer includes a first output terminal and a second output terminal; The first end of the twenty-fourth resistor R24 ​​is connected to the first output end of the current transformer, the first end of the twenty-fifth resistor, and the first end of the sixth capacitor C6; the second end of the twenty-fourth resistor R24 ​​is connected to the second output end of the current transformer, the second end of the sixth capacitor C6 and grounded; the second end of the twenty-fifth resistor R25 is connected to the first input end A of the optocoupler U4; the second end of the sixth capacitor C6 is connected to the second input end K of the optocoupler U4; the first output end C of the optocoupler U4 is connected to the first end of the twenty-sixth resistor R26 and the first end of the twenty-seventh resistor R27; the second output end E of the optocoupler U4 is connected to the second power supply VCC2; the second end of the twenty-sixth resistor R26 is grounded; the second end of the twenty-seventh resistor R27 is connected to the first end of the seventh capacitor C7 and the output end of the current detection module; the second end of the seventh capacitor C7 is connected to the second power supply VCC2; and the output end of the current detection module is connected to the microcontroller.

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