Charging pile, charging system and vehicle

Abstract

The invention relates to a charging pile, a charging system and a vehicle, the charging pile comprises a charging loop, a relay module used for controlling the on-off of the charging loop and an overvoltage control circuit, when the charging loop is in an overvoltage state, the power supply of a coil is maintained to be stopped, so that the coil loses voltage to disconnect the charging loop; therefore, the phenomenon that the charging loop is still intermittently conducted under the overvoltage condition is avoided, the situation that a post-stage circuit is damaged by instant large current is also avoided, and the safety of the charging pile is further improved.

Description

Technical Field

[0001] This application relates to the technical field of electronic circuits, and in particular, to a charging pile, a charging system, and a vehicle. Background Art

[0002] In most cases, the charging pile is equipped with an overvoltage protection mechanism, which automatically cuts off the charging circuit when overvoltage occurs to protect the vehicle and the charging pile itself.

[0003] However, in the case of overvoltage, the charging circuit is still intermittently conducting, which is prone to instantaneous large current and damages the subsequent circuit. Summary of the Invention

[0004] Embodiments of this application provide a charging pile, a charging system, and a vehicle, which improve the safety of the charging pile to at least partially solve the above technical problems.

[0005] To achieve the above object, according to the first aspect of this application, a charging pile is provided. The charging pile includes a charging circuit, a relay module for controlling the on / off of the charging circuit, and an overvoltage control circuit. The overvoltage control circuit is connected to the charging circuit and the coil of the relay module, and is used to maintain the power supply to the coil stopped when the charging circuit is in an overvoltage state.

[0006] Optionally, the overvoltage control circuit maintains the power supply to the coil stopped by locking the overvoltage state of the charging circuit.

[0007] Optionally, the overvoltage control circuit includes a voltage processing module, a voltage output module, and an overvoltage control module. The voltage processing module is connected to the charging circuit and is used to perform voltage protection, filtering, and rectification on the first voltage accessed by the charging circuit and then output it as the second voltage. The voltage output module is connected to the voltage processing module and the coil, and is used to supply power to the voltage output module through the second voltage and controllably provide the third voltage to the coil. The overvoltage control module is connected to the voltage output module and is used to control the voltage output module to stop providing the third voltage to the coil when the charging circuit is in an overvoltage state.

[0008] Optionally, the overvoltage control module includes an overvoltage judgment unit and a pull-down unit. The overvoltage judgment unit is connected to the voltage processing module and is used to output a corresponding overvoltage control signal when the charging circuit is in an overvoltage state. The pull-down unit is connected to the overvoltage judgment unit and the voltage output module and is used to output a fourth voltage with a low potential according to the overvoltage control signal to control the voltage output module to stop providing the third voltage to the coil.

[0009] Optionally, the overvoltage determination unit includes a three-terminal adjustable voltage regulator. The reference terminal of the three-terminal adjustable voltage regulator is connected to the voltage processing module, and the anode of the three-terminal adjustable voltage regulator is connected to the first ground terminal. The pull-down unit includes an optocoupler. The cathode of the light-emitting diode of the optocoupler is connected to the cathode of the three-terminal adjustable voltage regulator, the anode of the light-emitting diode of the optocoupler is connected to the first power supply terminal, the emitter of the phototransistor of the optocoupler is connected to the first ground terminal, and the collector of the phototransistor of the optocoupler outputs a fourth voltage.

[0010] Optionally, the overvoltage determination unit includes a comparator and a first diode. The first input terminal of the comparator is connected to the voltage processing module, and a reference voltage is applied to the second input terminal of the comparator; the anode of the first diode is connected to the output terminal of the comparator, and the cathode of the first diode is connected to the first input terminal of the comparator.

[0011] The pull-down unit includes a first transistor. The control terminal of the first transistor is connected to the output terminal of the comparator, the first terminal of the first transistor is connected to the first ground terminal, and the second terminal of the first transistor outputs a fourth voltage.

[0012] Optionally, the overvoltage control module further includes an energy storage voltage dividing unit and a first filtering unit. The energy storage voltage dividing unit is connected to the voltage processing module and is used for energy storage and dividing the second voltage into a corresponding fifth voltage; the first filtering unit is connected between the energy storage voltage dividing unit and the reference terminal of the three-terminal adjustable voltage regulator or the first input terminal of the comparator and is used for filtering the fifth voltage.

[0013] Optionally, the energy storage voltage dividing unit includes a first capacitor, a first resistor, and a second resistor. One end of the first capacitor is connected to one end of the first resistor and the output terminal of the voltage processing module, the other end of the first capacitor is connected to one end of the second resistor and the first ground terminal, and the other end of the first resistor is connected to the other end of the second resistor and outputs the fifth voltage.

[0014] The first filtering unit includes a second capacitor, a third resistor, and a third capacitor. One end of the second capacitor is connected to the other end of the first resistor and one end of the third resistor, the other end of the second capacitor is connected to the first ground terminal and one end of the third capacitor, the other end of the third resistor is connected to the other end of the third capacitor, and the other end of the third capacitor is connected to the reference terminal of the three-terminal adjustable voltage regulator or the first input terminal of the comparator.

[0015] Optionally, the other end of the third capacitor is connected to the first input terminal of the comparator. The overvoltage determination unit further includes a second diode, a third diode, a fourth resistor, a fifth resistor, a fourth capacitor, and a first Zener diode. The anode of the second diode is connected to the neutral line of the charging circuit. The anode of the third diode is connected to a live wire of the charging circuit. The cathode of the second diode is connected to the cathode of the third diode and one end of the fourth resistor. The other end of the fourth resistor is connected to the cathode of the first Zener diode and one end of the fourth capacitor to output a reference voltage. The anode of the first Zener diode is connected to the other end of the fourth capacitor and the first grounding terminal through the fifth resistor.

[0016] Optionally, the pull-down unit further includes a sixth resistor and a seventh resistor. The sixth resistor is connected between the output terminal of the comparator and the control electrode of the first transistor. The seventh resistor is connected between the control electrode of the first transistor and the first electrode of the first transistor.

[0017] Optionally, the overvoltage determination unit includes a fourth diode, a fifth diode, an eighth resistor, a ninth resistor, a fifth capacitor, and a second Zener diode. The anode of the fourth diode is connected to a live wire of the charging circuit. The anode of the fifth diode is connected to a neutral line of the charging circuit. One end of the eighth resistor is connected to the cathodes of the fourth diode and the fifth diode. The other end of the eighth resistor is connected to one end of the ninth resistor, one end of the fifth capacitor, and the cathode of the second Zener diode. The other end of the ninth resistor is connected to the other end of the fifth capacitor and the first grounding terminal.

[0018] The pull-down unit includes a second transistor. The control electrode of the second transistor is connected to the anode of the second Zener diode. The first electrode of the second transistor is connected to the first grounding terminal. The second electrode of the second transistor outputs a fourth voltage.

[0019] Optionally, the voltage processing module includes a protection unit, a second filtering unit, and a rectifying unit. The protection unit is connected to the charging circuit and is used to perform overcurrent and surge protection on the first voltage of the charging circuit. The second filtering unit is connected to the protection unit and is used to filter the voltage output by the protection unit. The rectifying unit is connected to the second filtering unit and the voltage output module and is used to rectify the output voltage of the second filtering unit to obtain a second voltage.

[0020] Optionally, the protection unit includes a fuse wire, a first varistor, a second varistor, a third varistor, a gas discharge tube, and a thermistor. One end of the fuse wire is connected to a live wire of the charging circuit. The other end of the fuse wire is connected to one end of the first varistor and one end of the second varistor. The other end of the second varistor is connected to one end of the third varistor and one end of the gas discharge tube. The other end of the gas discharge tube is connected to the ground wire. One end of the thermistor is connected to the other end of the first varistor, the other end of the third varistor, and the neutral line of the charging circuit. The other end of the thermistor is connected to the second filtering unit.

[0021] Optionally, the second filtering unit includes a first inductor, a tenth resistor, an eleventh resistor, a sixth capacitor, a seventh capacitor, an eighth capacitor, and a common-mode filter; one end of the first inductor is connected to the other end of the fuse wire, and the other end of the first inductor is connected to one end of the tenth resistor, one end of the sixth capacitor, and the first end of the common-mode filter. The other end of the tenth resistor is connected to one end of the eleventh resistor, and the other end of the eleventh resistor is connected to the other end of the sixth capacitor, the other end of the thermistor, and the fourth end of the common-mode filter.

[0022] The rectifying unit includes a rectifier bridge. The first input terminal of the rectifier bridge is connected to the second end of the common-mode filter, the second input terminal of the rectifier bridge is connected to the third end of the common-mode filter, the first output terminal of the rectifier bridge is connected to the first grounding terminal, and the second output terminal of the rectifier bridge outputs a second voltage.

[0023] Optionally, the voltage output module includes a first voltage output unit, a second voltage output unit, and an output control unit. The first voltage output unit is connected to the output terminal of the voltage processing module and the relay module, and is configured to output a third voltage under the control of the second voltage; the second voltage output unit is coupled to the first voltage output unit and is configured to output a fourth voltage at a high potential to control the voltage output module to supply the third voltage to the coil; the output control unit is connected to the first voltage output unit and the second voltage output unit, and is configured to control whether the voltage output module outputs the third voltage according to the fourth voltage.

[0024] Optionally, the first voltage output unit includes a ninth capacitor, a twelfth resistor, a sixth diode, a seventh diode, and a transformer; the first end of the transformer is connected to one end of the ninth capacitor and one end of the twelfth resistor and is connected to the second voltage. The cathode of the sixth diode is connected to the other end of the ninth capacitor and the other end of the twelfth resistor, the anode of the sixth diode is connected to the second end of the transformer, the third end of the transformer is connected to the coil, and the seventh diode is connected between the fourth end of the transformer and the second grounding terminal.

[0025] Optionally, the first voltage output unit further includes a tenth capacitor, an eleventh capacitor, a thirteenth resistor, and a fourteenth resistor; the thirteenth resistor is connected between the anode of the sixth diode and the second end of the transformer, the tenth capacitor is connected between the third end of the transformer and the second grounding terminal, one end of the fourteenth resistor is connected to the cathode of the seventh diode, and the other end of the fourteenth resistor is connected to one end of the eleventh capacitor, and the other end of the eleventh capacitor is connected to the second grounding terminal.

[0026] Optionally, the output control unit includes a third transistor. The first pole of the third transistor is connected to the second end of the transformer, the second pole of the third transistor is connected to the first grounding terminal, and the control pole of the third transistor is connected to the overvoltage control module.

[0027] Optionally, the output control unit further includes a fifteenth resistor connected between the second pole of the third transistor and the first ground terminal.

[0028] Optionally, the second voltage output unit includes a first winding, a sixteenth resistor, a seventeenth resistor, an eighth diode, and a voltage processing chip; the first winding is part of a transformer, one end of the first winding is connected to the anode of the eighth diode and one end of the sixteenth resistor, the other end of the first winding is connected to one end of the seventeenth resistor and the first ground terminal, the cathode of the eighth diode is connected to the power supply pin of the voltage processing chip, the drive pin of the voltage processing chip is connected to the control electrode of the third transistor, the current feedback pin of the voltage processing chip is connected to one end of the fifteenth resistor and the second pole of the third transistor, the compensation pin of the voltage processing chip is connected to the first ground terminal, and the voltage feedback pin of the voltage processing chip is connected to the other end of the sixteenth resistor and the other end of the seventeenth resistor.

[0029] Optionally, the second voltage output unit further includes a twelfth capacitor, a thirteenth capacitor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, and a ninth diode; the twelfth capacitor is connected between the cathode of the eighth diode and the first ground terminal, the thirteenth capacitor is connected between the compensation pin and the first ground terminal, the eighteenth resistor is connected in parallel with the thirteenth capacitor, the nineteenth resistor is connected between the drive pin and the control electrode of the third transistor, the anode of the ninth diode is connected to the control electrode of the third transistor, the cathode of the ninth diode is connected to one end of the twentieth resistor, and the other end of the twentieth resistor is connected to the drive pin.

[0030] Optionally, the second voltage output unit further includes a twelfth diode, a fourteenth capacitor, and a twenty-first resistor; the anode of the twelfth diode is connected to the anode of the eighth diode, the cathode of the twelfth diode is connected to one end of the fourteenth capacitor and one end of the twenty-first resistor, the other end of the fourteenth capacitor is connected to the first ground terminal, and the other end of the twenty-first resistor is connected to the first power supply terminal.

[0031] Optionally, the charging pile further includes a control module connected to the charging circuit and the relay module for controlling the normal power supply of the coil when at least one of the charging circuit and the relay module is in a normal state and the charging circuit is not in an overvoltage state.

[0032] Optionally, the control module is configured to perform at least one of ground detection, input current detection, leakage current detection, and adhesion detection; the ground detection is used to detect whether the ground wire in the charging circuit is grounded; the input current detection is used to detect whether the current in the charging circuit is in an overcurrent state; the leakage current detection is used to detect whether the charging circuit is in a leakage current state; and the adhesion detection is used to detect whether the contacts of the relay module are adhered.

[0033] According to a second aspect of the present application, a charging system is provided, and the charging system includes the above-mentioned charging pile.

[0034] According to a third aspect of the present application, a vehicle is further provided, and the vehicle is configured to be connected to the above-mentioned charging pile during charging; alternatively, the vehicle is configured to be connected to the above-mentioned charging system during charging.

[0035] For the charging pile, charging system and vehicle according to the embodiments of the present application, by maintaining the power supply to the coil stopped when the charging circuit is in an overvoltage state, the coil can lose voltage and disconnect the charging circuit, thereby avoiding the intermittent conduction of the charging circuit under overvoltage conditions and also avoiding damage to the subsequent circuit by instantaneous large current, and further improving the safety of the charging pile.

[0036] Other features and advantages of the present application will be described in detail in the subsequent specific implementation section. Description of the Drawings

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings based on these drawings without creative efforts.

[0038] In order to more fully understand the present application and its beneficial effects, the following description will be made in conjunction with the drawings, where the same reference numerals in the following description represent the same parts.

[0039] Figure 1 is the overall circuit schematic diagram of the charging pile provided in the exemplary embodiment of the present disclosure;

[0040] Figure 2 is the first circuit schematic diagram of the overvoltage control module provided in the exemplary embodiment of the present disclosure;

[0041] Figure 3 is the second circuit schematic diagram of the overvoltage control module provided in the exemplary embodiment of the present disclosure;

[0042] Figure 4 is the third circuit schematic diagram of the overvoltage control module provided in the exemplary embodiment of the present disclosure;

[0043] Figure 5 is the timing schematic diagram provided in the exemplary embodiment of the present disclosure.

[0044] Description of the Reference Numerals:

[0045] 10. Charging circuit;

[0046] 20. Relay module;

[0047] 30. Overvoltage control circuit; 31. Voltage processing module; 32. Voltage output module; 33. Overvoltage control module;

[0048] 311. Protection unit; 312. Second filtering unit; 313. Rectification unit;

[0049] 321. First voltage output unit; 322. Second voltage output unit; 323. Output control unit;

[0050] 331. Overvoltage judgment unit; 332. Pull-down unit; 333. Energy storage voltage dividing unit; 334. First filtering unit;

[0051] 40. Control module. Specific embodiments

[0052] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0053] The embodiments of the present application provide a charging pile. Please refer to Figures 1 to 5 , as Figure 1 shown, the charging pile includes a charging circuit 10, a relay module 20 for controlling the on / off of the charging circuit 10, and an overvoltage control circuit 30. The overvoltage control circuit 30 is connected to the charging circuit 10 and the coil of the relay module 20, and the overvoltage control circuit 30 is used to maintain the power supply to the coil when the charging circuit 10 is in an overvoltage state.

[0054] It can be understood that for the charging pile in the embodiments of the present application, by maintaining the power supply to the coil when the charging circuit 10 is in an overvoltage state, the coil can lose voltage and the charging circuit 10 can be disconnected, thereby avoiding the intermittent conduction of the charging circuit under overvoltage conditions and also avoiding damage to the subsequent circuit by instantaneous large current, thereby improving the safety of the charging pile.

[0055] It should be noted that the contact group corresponding to the first coil K1 in the relay module 20 can be used to control the on / off of the live wire L. The contact group corresponding to the second coil K2 in the relay module 20 can be used to control the on / off of the neutral wire N. In some embodiments, the first end 4 of the first coil K1 can be connected to a low potential end, such as the ground wire PE or the second grounding end GND, so that the corresponding contact group can be disconnected when maintaining the power supply to the coil.

[0056] Optionally, asFigure 1 As shown, the overvoltage control circuit 30 includes a voltage processing module 31, a voltage output module 32, and an overvoltage control module 33. The voltage processing module 31 is connected to the charging circuit 10 and is used to perform voltage protection, filtering, and rectification on the first voltage V5 accessed by the charging circuit 10 and then output it as the second voltage V3. The voltage output module 32 is connected to the voltage processing module 31 and the coil, and is used to supply power to the voltage output module 32 through the second voltage V3 and controllably provide the third voltage V4 to the coil. The overvoltage control module 33 is connected to the voltage output module 32 and is used to control the voltage output module 32 to stop providing the third voltage V4 to the coil when the charging circuit 10 is in an overvoltage state.

[0057] It should be noted that when the second voltage V3 is greater than or equal to the overvoltage threshold, the overvoltage control module 33 outputs the low-potential fourth voltage V2, which can control the voltage output module 32 to stop outputting the normal third voltage V4, and the normal third voltage V4 can enable the coil to work normally.

[0058] Optionally, as Figure 2 、 Figure 3 and Figure 4 shown, the overvoltage control module 33 includes an overvoltage judgment unit 331 and a pull-down unit 332. The overvoltage judgment unit 331 is connected to the voltage processing module 31 and is used to output a corresponding overvoltage control signal when the charging circuit 10 is in an overvoltage state. The pull-down unit 332 is connected to the overvoltage judgment unit 331 and the voltage output module 32 and is used to output the low-potential fourth voltage V2 according to the overvoltage control signal to control the voltage output module 32 to stop providing the third voltage V4 to the coil.

[0059] It should be noted that the overvoltage judgment unit 331 is used to configure a corresponding overvoltage threshold and can judge whether the charging circuit 10 is in an overvoltage state according to the comparison result between the processed first voltage V5 and the overvoltage threshold. When the charging circuit 10 is in an overvoltage state, this comparison result can pull down the fourth voltage V2 to a low potential through the pull-down unit 332, such as the potential of the first ground terminal PGND.

[0060] Optionally, as Figure 2 shown, the overvoltage judgment unit 331 includes a three-terminal adjustable voltage regulator U1. The reference terminal of the three-terminal adjustable voltage regulator U1 is connected to the voltage processing module 31, and the anode of the three-terminal adjustable voltage regulator U1 is connected to the first ground terminal PGND. The pull-down unit 332 includes an optocoupler U3. The cathode of the light-emitting diode of the optocoupler U3 is connected to the cathode of the three-terminal adjustable voltage regulator U1, the anode of the light-emitting diode of the optocoupler U3 is connected to the first power supply terminal VCC1, the emitter of the photosensitive transistor of the optocoupler U3 is connected to the first ground terminal PGND, and the collector of the photosensitive transistor of the optocoupler U3 outputs the fourth voltage V2.

[0061] It should be noted that when overvoltage occurs, the potential of the reference terminal of the three-terminal adjustable voltage regulator U1 is greater than the overvoltage threshold, that is, the internal threshold voltage of the three-terminal adjustable voltage regulator U1, then the anode of the three-terminal adjustable voltage regulator U1 is conducted with the cathode of the three-terminal adjustable voltage regulator U1, the light-emitting diode of the optocoupler U3 starts to emit light, and the collector of the photosensitive transistor of the optocoupler U3 is conducted with the emitter of the photosensitive transistor of the optocoupler U3, and the potential of the first ground terminal PGND is output as the fourth voltage V2.

[0062] Optionally, as Figure 3 shown, the overvoltage judgment unit 331 includes a comparator U3A and a first diode D6. The first input terminal of the comparator U3A is connected to the voltage processing module 31, and the second input terminal of the comparator U3A is connected to the reference voltage VREF; the anode of the first diode D6 is connected to the output terminal of the comparator U3A, and the cathode of the first diode D6 is connected to the first input terminal of the comparator U3A.

[0063] The pull-down unit 332 includes a first transistor Q2. The control electrode of the first transistor Q2 is connected to the output terminal of the comparator U3A. The first pole of the first transistor Q2 is connected to the first ground terminal PGND, and the second pole of the first transistor Q2 outputs the fourth voltage V2.

[0064] It should be noted that when no overvoltage occurs, the fifth voltage V1 is less than or equal to the overvoltage threshold, that is, the reference voltage VREF. The comparator U3A and the first transistor Q2 do not work, the fourth voltage V2 is at a high level, the third voltage V4 normally supplies power to the coil, and the charging pile works normally.

[0065] When overvoltage occurs, the fifth voltage V1 is greater than the overvoltage threshold, that is, the reference voltage VREF. The pin 1 of the comparator U3A outputs a high level. The collector and emitter of the first transistor Q2 are conducted to pull the fourth voltage V2 to a low level. The first diode D6 clamps the fifth voltage V1. The power supply of the third voltage V4 is disconnected, the coil has no power supply, the charging circuit is disconnected, and the input voltage to the rear-end vehicle is stopped.

[0066] Thus, the overvoltage self-locking function is realized: when overvoltage occurs, the pin 1 of the comparator U3A outputs a high level approximately equal to the first power supply terminal VCC1, making the first transistor Q2 conduct and pulling the fourth voltage V2 to a low level; the output voltage of the pin 1 of the comparator U3A is fed back to the pin 3 of the comparator U3A through the first diode D6; therefore, when the first voltage V5 is overvoltage, the voltage of the pin 3 of the comparator U3A is always maintained above the overvoltage threshold, and the potential of the fourth voltage V2 will be continuously pulled low, avoiding the adhesion of the relays K1 and K2 caused by the repeated fluctuation of the first voltage V5, and avoiding the occurrence of fire or other accidents due to the inability to safely disconnect when the charging pile fails. Therefore, the overvoltage control circuit 30 is also used to lock the overvoltage state to maintain the power supply stop to the coil when the charging circuit 10 is in an overvoltage state.

[0067] Optionally, as Figure 2 and Figure 3 shown, the overvoltage control module 33 further includes an energy storage voltage dividing unit 333 and a first filtering unit 334. The energy storage voltage dividing unit 333 is connected to the voltage processing module 31, and is used for energy storage and dividing the second voltage V3 into a corresponding fifth voltage V1; the first filtering unit 334 is connected between the energy storage voltage dividing unit 333 and the reference terminal of the three-terminal adjustable voltage regulator U1 or the first input terminal of the comparator U3A, and is used for filtering the fifth voltage V1.

[0068] It should be noted that when the voltage value of the second voltage V3 can be directly connected to pin 3 of the comparator U3A, there is no need to divide the voltage of the second voltage V3. Therefore, the energy storage voltage dividing unit 333 is optional. The first filtering unit 334 is to improve the accuracy of the fifth voltage V1, and thus improve the accuracy of overvoltage judgment. Therefore, the first filtering unit 334 is optional.

[0069] Optionally, as Figure 2 and Figure 3 shown, the energy storage voltage dividing unit 333 includes a first capacitor CE2, a first resistor R2, and a second resistor R3. One end of the first capacitor CE2 is connected to one end of the first resistor R2 and the output terminal of the voltage processing module 31. The other end of the first capacitor CE2 is connected to one end of the second resistor R3 and the first ground terminal PGND. The other end of the first resistor R2 is connected to the other end of the second resistor R3 and outputs the fifth voltage V1.

[0070] The first filtering unit 334 includes a second capacitor C5, a third resistor R15, and a third capacitor C2. One end of the second capacitor C5 is connected to the other end of the first resistor R2 and one end of the third resistor R15. The other end of the second capacitor C5 is connected to the first ground terminal PGND and one end of the third capacitor C2. The other end of the third resistor R15 is connected to the other end of the third capacitor C2, and the other end of the third capacitor C2 is connected to the reference terminal of the three-terminal adjustable voltage regulator U1 or the first input terminal of the comparator U3A.

[0071] Optionally, as Figure 3As shown, the other end of the third capacitor C2 is connected to the first input terminal of the comparator U3A. The overvoltage determination unit 331 further includes a second diode D7, a third diode D8, a fourth resistor R18, a fifth resistor R19, a fourth capacitor C6, and a first Zener diode ZD1. The anode of the second diode D7 is connected to the neutral line N of the charging circuit 10, the anode of the third diode D8 is connected to a live wire L of the charging circuit 10, the cathode of the second diode D7 is connected to the cathode of the third diode D8 and one end of the fourth resistor R18, and the other end of the fourth resistor R18 is connected to the cathode of the first Zener diode ZD1 and one end of the fourth capacitor C6 to output a reference voltage VREF. The anode of the first Zener diode ZD1 is connected to the other end of the fourth capacitor C6 and the first ground terminal PGND through the fifth resistor R19.

[0072] It should be noted that in this embodiment, the reference voltage VREF is configured by means of the voltage of the charging circuit 10, thus saving a dedicated reference voltage circuit for generating the reference voltage VREF.

[0073] Optionally, as Figure 3 shown, the pull-down unit 332 further includes a sixth resistor RK1 and a seventh resistor RK2. The sixth resistor RK1 is connected between the output terminal of the comparator U3A and the control electrode of the first transistor Q2, and the seventh resistor RK2 is connected between the control electrode of the first transistor Q2 and the first electrode of the first transistor Q2.

[0074] It should be noted that the sixth resistor RK1 and the seventh resistor RK2 can divide the output voltage of the comparator U3A to drive the first transistor Q2 to avoid damage to the first transistor Q2. The seventh resistor RK2 can also adjust the voltage difference between the control electrode and the emitter of the first transistor Q2.

[0075] Optionally, as Figure 4 shown, the overvoltage determination unit 331 includes a fourth diode D9, a fifth diode D10, an eighth resistor R20, a ninth resistor R21, a fifth capacitor C7, and a second Zener diode ZD2. The anode of the fourth diode D9 is connected to a live wire L of the charging circuit 10, the anode of the fifth diode D10 is connected to the neutral line N of the charging circuit 10, one end of the eighth resistor R20 is connected to the cathode of the fourth diode D9 and the cathode of the fifth diode D10, and the other end of the eighth resistor R20 is connected to one end of the ninth resistor R21, one end of the fifth capacitor C7, and the cathode of the second Zener diode ZD2. The other end of the ninth resistor R21 is connected to the other end of the fifth capacitor C7 and the first ground terminal PGND.

[0076] The pull - down unit 332 includes a second transistor Q3. The control electrode of the second transistor Q3 is connected to the anode of the second Zener diode ZD2. The first electrode of the second transistor Q3 is connected to the first ground terminal PGND. The second electrode of the second transistor Q3 outputs a fourth voltage V2.

[0077] It should be noted that the input voltage of the charging circuit 10 is rectified by the fourth diode D9 and the fifth diode D10 and then divided by the eighth resistor R20 and the ninth resistor R21. When over - voltage occurs, the second Zener diode ZD2 conducts, causing the second transistor Q3 to work, pulling the fourth voltage V2 to a low level, disconnecting the power supply of the third voltage V4, cutting off the power supply of the coil, and disconnecting the charging circuit to stop inputting voltage to the rear - end vehicle.

[0078] Optionally, as Figure 1 shown, the voltage processing module 31 includes a protection unit 311, a second filtering unit 312, and a rectifying unit 313. The protection unit 311 is connected to the charging circuit 10 and is used to perform over - current and surge protection on the first voltage V5 of the charging circuit 10. The second filtering unit 312 is connected to the protection unit 311 and is used to filter the voltage output by the protection unit 311. The rectifying unit 313 is connected to the second filtering unit 312 and the voltage output module 32 and is used to rectify the output voltage of the second filtering unit 312 to obtain a second voltage V3.

[0079] Optionally, as Figure 1 shown, the protection unit 311 includes a fuse wire F1, a first varistor RV1, a second varistor RV2, a third varistor RV3, a gas discharge tube GDT1, and a thermistor NTC1. One end of the fuse wire F1 is connected to a live wire L of the charging circuit 10. The other end of the fuse wire F1 is connected to one end of the first varistor RV1 and one end of the second varistor RV2. The other end of the second varistor RV2 is connected to one end of the third varistor RV3 and one end of the gas discharge tube GDT1. The other end of the gas discharge tube GDT1 is connected to the ground wire PE. One end of the thermistor NTC1 is connected to the other end of the first varistor RV1, the other end of the third varistor RV3, and the neutral wire N of the charging circuit 10. The other end of the thermistor NTC1 is connected to the second filtering unit 312.

[0080] It should be noted that the thermistor NTC1 can be a negative temperature coefficient thermistor to achieve corresponding over - temperature protection. The fuse wire F1 can achieve over - current protection. The first varistor RV1, the second varistor RV2, the third varistor RV3, and the gas discharge tube GDT1 can protect other components from the impact of instantaneous over - voltage.

[0081] Optionally, as Figure 1As shown, the second filtering unit 312 includes a first inductor L1, a tenth resistor R12, an eleventh resistor R13, a sixth capacitor CX2, a seventh capacitor CY1, an eighth capacitor CY2, and a common-mode filter FIT2; one end of the first inductor L1 is connected to the other end of the fuse wire F1, and the other end of the first inductor L1 is connected to one end of the tenth resistor R12, one end of the sixth capacitor CX2, and the first terminal 1 of the common-mode filter FIT2. The other end of the tenth resistor R12 is connected to one end of the eleventh resistor R13, and the other end of the eleventh resistor R13 is connected to the other end of the sixth capacitor CX2, the other end of the thermistor NTC1, and the fourth terminal 4 of the common-mode filter FIT2.

[0082] It should be noted that the second filtering unit 312 can make the subsequent obtained second voltage V3 more accurate, thereby improving the accuracy of overvoltage protection.

[0083] As Figure 1 shown, the rectifying unit 313 includes a rectifying bridge BD1. The first input terminal of the rectifying bridge BD1 is connected to the second terminal 2 of the common-mode filter FIT2, the second input terminal of the rectifying bridge BD1 is connected to the third terminal 3 of the common-mode filter FIT2, the first output terminal of the rectifying bridge BD1 is connected to the first ground terminal PGND, and the second output terminal of the rectifying bridge BD1 outputs the second voltage V3.

[0084] It should be noted that the rectifying bridge BD1 can be a full-wave rectifier composed of four diodes or a half-wave rectifier composed of one diode.

[0085] Optionally, as Figure 1 shown, the voltage output module 32 includes a first voltage output unit 321, a second voltage output unit 322, and an output control unit 323. The first voltage output unit 321 is connected to the output terminal of the voltage processing module 31 and the relay module 20, and is used to output a third voltage V4 under the control of the second voltage V3; the second voltage output unit 322 is coupled to the first voltage output unit 321 and is used to output a fourth voltage V2 with a high potential to control the voltage output module 32 to provide the third voltage V4 to the coil; the output control unit 323 is connected to the first voltage output unit 321 and the second voltage output unit 322, and is used to control whether the voltage output module 32 outputs the third voltage V4 according to the fourth voltage V2.

[0086] It should be noted that not outputting the third voltage V4 means that the third voltage V4 cannot make the coil work properly. For example, the third voltage V4 is at a low potential or zero potential.

[0087] Optionally, as Figure 1As shown, the first voltage output unit 321 includes a ninth capacitor C1, a twelfth resistor R4, a sixth diode D1, a seventh diode D2, and a transformer T1A; the first terminal 3 of the transformer T1A is connected to one end of the ninth capacitor C1 and one end of the twelfth resistor R4 and is connected to the second voltage V3, the negative electrode of the sixth diode D1 is connected to the other end of the ninth capacitor C1 and the other end of the twelfth resistor R4, the positive electrode of the sixth diode D1 is connected to the second terminal 1 of the transformer T1A, the third terminal 8 of the transformer T1A is connected to a coil, and the seventh diode D2 is connected between the fourth terminal 9 of the transformer T1A and the second ground terminal GND.

[0088] It should be noted that the winding between the first terminal 3 and the second terminal 1 of the transformer T1A can be the primary winding, and the winding between the third terminal 8 and the fourth terminal 9 of the transformer T1A can be the secondary winding.

[0089] Optionally, as Figure 1 shown, the first voltage output unit 321 further includes a tenth capacitor CE3, an eleventh capacitor C3, a thirteenth resistor R5, and a fourteenth resistor R6; the thirteenth resistor R5 is connected between the anode of the sixth diode D1 and the second terminal 1 of the transformer T1A, the tenth capacitor CE3 is connected between the third terminal 8 of the transformer T1A and the second ground terminal GND, one end of the fourteenth resistor R6 is connected to the cathode of the seventh diode D2, the other end of the fourteenth resistor R6 is connected to one end of the eleventh capacitor C3, and the other end of the eleventh capacitor C3 is connected to the second ground terminal GND.

[0090] Optionally, as Figure 1 shown, the output control unit 323 includes a third transistor Q1, the first pole of the third transistor Q1 is connected to the second terminal 1 of the transformer T1A, the second pole of the third transistor Q1 is connected to the first ground terminal PGND, and the control pole of the third transistor Q1 is connected to the overvoltage control module 33.

[0091] It should be noted that the third transistor Q1 can be an N-channel transistor, which is turned on at high level and turned off at low level.

[0092] Optionally, as Figure 1 shown, the output control unit 323 further includes a fifteenth resistor R7, and the fifteenth resistor R7 is connected between the second pole of the third transistor Q1 and the first ground terminal PGND.

[0093] It should be noted that the fifteenth resistor R7 is used to detect the current flowing through the third transistor Q1.

[0094] Optionally, as Figure 1As shown, the second voltage output unit 322 includes a first winding T1B, a sixteenth resistor R10, a seventeenth resistor R11, an eighth diode D4, and a voltage processing chip U2; the first winding T1B is a part of the transformer T1A, one end of the first winding T1B is connected to the positive electrode of the eighth diode D4 and one end of the sixteenth resistor R10, the other end of the first winding T1B is connected to one end of the seventeenth resistor R11 and the first ground terminal PGND, the negative electrode of the eighth diode D4 is connected to the power supply pin VDD of the voltage processing chip U2, the drive pin DRV of the voltage processing chip U2 is connected to the control electrode of the third transistor Q1, the current feedback pin IFB of the voltage processing chip U2 is connected to one end of the fifteenth resistor R7 and the second electrode of the third transistor Q1, the compensation pin COMP of the voltage processing chip U2 is connected to the first ground terminal PGND, and the voltage feedback pin VFB of the voltage processing chip U2 is connected to the other end of the sixteenth resistor R10 and the other end of the seventeenth resistor R11.

[0095] It should be noted that the first winding T1B is a part of the transformer T1A, and the first winding T1B can couple a corresponding proportion of voltage from the primary winding of the transformer T1A.

[0096] Optionally, as Figure 1 shown, the second voltage output unit 322 further includes a twelfth capacitor CE1, a thirteenth capacitor C4, an eighteenth resistor R14, a nineteenth resistor R8, a twentieth resistor R9, and a ninth diode D3; the twelfth capacitor CE1 is connected between the negative electrode of the eighth diode D4 and the first ground terminal PGND, the thirteenth capacitor C4 is connected between the compensation pin COMP and the first ground terminal PGND, the eighteenth resistor R14 is connected in parallel with the thirteenth capacitor C4, the nineteenth resistor R8 is connected between the drive pin DRV and the control electrode of the third transistor Q1, the anode of the ninth diode D3 is connected to the control electrode of the third transistor Q1, the cathode of the ninth diode D3 is connected to one end of the twentieth resistor R9, and the other end of the twentieth resistor R9 is connected to the drive pin DRV.

[0097] Optionally, as Figure 1 shown, the second voltage output unit 322 further includes a twelfth diode D5, a fourteenth capacitor CE4, and a twenty-first resistor R17; the positive electrode of the twelfth diode D5 is connected to the positive electrode of the eighth diode D4, the negative electrode of the twelfth diode D5 is connected to one end of the fourteenth capacitor CE4 and one end of the twenty-first resistor R17, the other end of the fourteenth capacitor CE4 is connected to the first ground terminal PGND, and the other end of the twenty-first resistor R17 is connected to the first power supply terminal VCC1.

[0098] It should be noted that the first power supply terminal VCC1 can be the optocoupler U3 in Figure 2 or Figure 3The comparator U3A therein provides the corresponding operating voltage.

[0099] Optionally, as Figure 1 shown, the charging pile further includes a control module 40, which is connected to the charging circuit 10 and the relay module 20, and is used to control the normal power supply of the coil when at least one of the charging circuit 10 and the relay module 20 is in a normal state and the charging circuit 10 is not in an overvoltage state.

[0100] It should be noted that, in this embodiment, the first end 4 of the first coil K1 and the first end 3 of the second coil K2 can be connected to the corresponding pins of the control module 40, so as to jointly control the operating voltages of the coils K1 and K2 through the control module 40 and the third voltage V4. For example, in the case where the normal third voltage V4 is not output, the coils K1 and K2 do not work, and the corresponding contact groups are disconnected. In the case where the normal third voltage V4 is output, the corresponding pin of the control module 40 outputs a high level, the coils K1 and K2 do not work, and the corresponding contact groups are disconnected; or, in the case where the normal third voltage V4 is output, the corresponding pin of the control module 40 outputs a low level, the coils K1 and K2 work, and the corresponding contact groups are turned on. This further improves the safety and reliability.

[0101] Exemplarily, the control module 40 may include a micro control unit (MCU) and its peripheral circuits.

[0102] Optionally, the control module 40 is used to perform at least one of ground detection, input current detection, leakage current detection, and adhesion detection; the ground detection is used to detect whether the ground wire PE in the charging circuit 10 is grounded; the input current detection is used to detect whether the current in the charging circuit 10 is in an overcurrent state; the leakage current detection is used to detect whether the charging circuit 10 is in a leakage current state; the adhesion detection is used to detect whether the contacts of the relay module 20 are adhered.

[0103] Wherein, PE-out is the output signal of the ground wire PE. Lout is the output signal of the live wire L, Nout is the output signal of the neutral wire N, and the voltage difference between Lout and Nout is the sixth voltage V6.

[0104] As Figure 5 shown, when the second voltage V3 is less than or equal to the normal voltage VIN in the non-overvoltage state, it means that the fifth voltage V1 is less than or equal to the reference voltage VREF, the fourth voltage V2 is at a high potential, the third voltage V4 can normally supply power to the coil, and the charging circuit 10 can normally output the alternating current sixth voltage V6.

[0105] Conversely, when the second voltage V3 is greater than or equal to the normal voltage, i.e., VIN, it indicates that the fifth voltage V1 is greater than or equal to the reference voltage VREF, the fourth voltage V2 is at a low potential, and the third voltage V4 can stop supplying power to the coil, and the charging circuit 10 is disconnected and cannot output the alternating current sixth voltage V6.

[0106] In summary, the embodiments of the present application all adopt simple discrete devices, which makes the cost advantage of each solution obvious. Compared with overvoltage judgment that needs to be implemented through software algorithms and has a large delay, the embodiments of the present application are implemented through hardware, with a smaller delay, which is beneficial to improving the timeliness of overvoltage protection.

[0107] The embodiment of the present application provides a charging system, and the charging system includes the above-mentioned charging pile. It can be understood that since the charging system of the embodiment of the present application includes the above-mentioned charging pile, when the charging circuit 10 is in an overvoltage state, the power supply to the coil can be maintained to stop, so that the coil loses voltage and the charging circuit 10 is disconnected, thereby avoiding the intermittent conduction of the charging circuit under overvoltage conditions and also avoiding damage to the subsequent circuit by instantaneous large current, and further improving the safety of the charging pile.

[0108] The embodiment of the present application further provides a vehicle, which is configured to be connected to the above-mentioned charging pile during charging; or, the vehicle is configured to be connected to the above-mentioned charging system during charging.

[0109] It can be understood that since the charging system of the embodiment of the present application includes the above-mentioned charging pile or charging system, when the charging circuit 10 is in an overvoltage state, the power supply to the coil can be maintained to stop, so that the coil loses voltage and the charging circuit 10 is disconnected, thereby avoiding the intermittent conduction of the charging circuit under overvoltage conditions and also avoiding damage to the subsequent circuit by instantaneous large current, and further improving the safety of the charging pile.

[0110] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0111] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0112] Among the embodiments, implementation manners and related technical features of the present application, they can be combined and replaced with each other without conflict.

[0113] The above are only the preferred embodiments of the present application, and do not impose any formal restrictions on the present application. However, any simple modifications, equivalent changes, and decorations made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A charging pile, characterized in that, The charging pile includes: a charging circuit (10) and a relay module (20) for controlling the on / off of the charging circuit (10); an overvoltage control circuit (30), connected to the charging circuit (10) and the coil of the relay module (20), for maintaining power-off to the coil when the charging circuit (10) is in an overvoltage state.

2. The charging pile according to claim 1, characterized in that, The overvoltage control circuit (30) maintains power-off to the coil by locking the overvoltage state of the charging circuit (10).

3. The charging pile according to claim 1, wherein The overvoltage control circuit (30) includes: a voltage processing module (31), connected to the charging circuit (10), for performing voltage protection, filtering, and rectification on the first voltage (V5) accessed by the charging circuit (10) and then outputting it as the second voltage (V3); a voltage output module (32), connected to the voltage processing module (31) and the coil, for powering the voltage output module (32) through the second voltage (V3) and controllably providing the third voltage (V4) to the coil; an overvoltage control module (33), connected to the voltage output module (32), for controlling the voltage output module (32) to stop providing the third voltage (V4) to the coil when the charging circuit (10) is in an overvoltage state.

4. The charging pile according to claim 3, wherein The overvoltage control module (33) includes: an overvoltage judgment unit (331), connected to the voltage processing module (31), for outputting a corresponding overvoltage control signal when the charging circuit (10) is in an overvoltage state; a pull-down unit (332), connected to the overvoltage judgment unit (331) and the voltage output module (32), for outputting a low-potential fourth voltage (V2) according to the overvoltage control signal to control the voltage output module (32) to stop providing the third voltage (V4) to the coil.

5. The charging pile according to claim 4, characterized in that, The overvoltage judgment unit (331) includes a three-terminal adjustable voltage regulator (U1), the reference terminal of the three-terminal adjustable voltage regulator (U1) is connected to the voltage processing module (31), and the anode of the three-terminal adjustable voltage regulator (U1) is connected to the first ground terminal (PGND); The pull-down unit (332) includes an optocoupler (U3), the cathode of the light-emitting diode of the optocoupler (U3) is connected to the cathode of the three-terminal adjustable voltage regulator (U1), the anode of the light-emitting diode of the optocoupler (U3) is connected to the first power supply terminal (VCC1), the emitter of the photosensitive transistor of the optocoupler (U3) is connected to the first ground terminal (PGND), and the collector of the photosensitive transistor of the optocoupler (U3) outputs the fourth voltage (V2).

6. The charging pile according to claim 4, wherein, The overvoltage judgment unit (331) includes a comparator (U3A) and a first diode (D6). The first input terminal of the comparator (U3A) is connected to the voltage processing module (31), and the second input terminal of the comparator (U3A) is connected to a reference voltage (VREF); the anode of the first diode (D6) is connected to the output terminal of the comparator (U3A), and the cathode of the first diode (D6) is connected to the first input terminal of the comparator (U3A); The pull-down unit (332) includes a first transistor (Q2). The control electrode of the first transistor (Q2) is connected to the output terminal of the comparator (U3A). The first pole of the first transistor (Q2) is connected to a first ground terminal (PGND), and the second pole of the first transistor (Q2) outputs the fourth voltage (V2).

7. The charging pile according to claim 5 or 6, characterized in that, The overvoltage control module (33) further includes: An energy storage voltage dividing unit (333), connected to the voltage processing module (31), for energy storage and dividing the second voltage (V3) into a corresponding fifth voltage (V1); A first filtering unit (334), connected between the energy storage voltage dividing unit (333) and the reference terminal of the three-terminal adjustable voltage regulator (U1) or the first input terminal of the comparator (U3A), for filtering the fifth voltage (V1).

8. The charging pile according to claim 7, characterized in that, The energy storage voltage dividing unit (333) includes a first capacitor (CE2), a first resistor (R2), and a second resistor (R3). One end of the first capacitor (CE2) is connected to one end of the first resistor (R2) and the output terminal of the voltage processing module (31). The other end of the first capacitor (CE2) is connected to one end of the second resistor (R3) and the first ground terminal (PGND). The other end of the first resistor (R2) is connected to the other end of the second resistor (R3) and outputs the fifth voltage (V1); The first filtering unit (334) includes a second capacitor (C5), a third resistor (R15), and a third capacitor (C2). One end of the second capacitor (C5) is connected to the other end of the first resistor (R2) and one end of the third resistor (R15). The other end of the second capacitor (C5) is connected to the first ground terminal (PGND) and one end of the third capacitor (C2). The other end of the third resistor (R15) is connected to the other end of the third capacitor (C2), and the other end of the third capacitor (C2) is connected to the reference terminal of the three-terminal adjustable voltage regulator (U1) or the first input terminal of the comparator (U3A).

9. The charging pile according to claim 8, characterized in that The other end of the third capacitor (C2) is connected to the first input terminal of the comparator (U3A). The overvoltage judgment unit (331) further includes a second diode (D7), a third diode (D8), a fourth resistor (R18), a fifth resistor (R19), a fourth capacitor (C6), and a first Zener diode (ZD1); The anode of the second diode (D7) is connected to the neutral line (N) of the charging circuit (10), the anode of the third diode (D8) is connected to a live wire (L) of the charging circuit (10), the cathode of the second diode (D7) is connected to the cathode of the third diode (D8) and one end of the fourth resistor (R18), the other end of the fourth resistor (R18) is connected to the cathode of the first Zener diode (ZD1) and one end of the fourth capacitor (C6) to output the reference voltage (VREF), and the anode of the first Zener diode (ZD1) is connected to the other end of the fourth capacitor (C6) and the first ground terminal (PGND) through the fifth resistor (R19).

10. The charging pile according to claim 6, characterized in that, The pull-down unit (332) further includes a sixth resistor (RK1) and a seventh resistor (RK2). The sixth resistor (RK1) is connected between the output terminal of the comparator (U3A) and the control electrode of the first transistor (Q2), and the seventh resistor (RK2) is connected between the control electrode of the first transistor (Q2) and the first electrode of the first transistor (Q2).

11. The charging pile according to claim 4, characterized in that, The overvoltage determination unit (331) includes a fourth diode (D9), a fifth diode (D10), an eighth resistor (R20), a ninth resistor (R21), a fifth capacitor (C7), and a second Zener diode (ZD2). The anode of the fourth diode (D9) is connected to a live wire (L) of the charging circuit (10), the anode of the fifth diode (D10) is connected to the neutral line (N) of the charging circuit (10), one end of the eighth resistor (R20) is connected to the cathodes of the fourth diode (D9) and the fifth diode (D10), the other end of the eighth resistor (R20) is connected to one end of the ninth resistor (R21), one end of the fifth capacitor (C7), and the cathode of the second Zener diode (ZD2), and the other end of the ninth resistor (R21) is connected to the other end of the fifth capacitor (C7) and the first ground terminal (PGND); The pull-down unit (332) includes a second transistor (Q3). The control electrode of the second transistor (Q3) is connected to the anode of the second Zener diode (ZD2), the first electrode of the second transistor (Q3) is connected to the first ground terminal (PGND), and the second electrode of the second transistor (Q3) outputs the fourth voltage (V2).

12. The charging pile according to claim 3, characterized in that, The voltage processing module (31) includes: A protection unit (311), connected to the charging circuit (10), for performing overcurrent and surge protection on the first voltage (V5) of the charging circuit (10); A second filtering unit (312), connected to the protection unit (311), for filtering the voltage output by the protection unit (311); A rectifying unit (313), connected to the second filtering unit (312) and the voltage output module (32), for rectifying the output voltage of the second filtering unit (312) to obtain the second voltage (V3).

13. The charging pile according to claim 12, characterized in that, The protection unit (311) includes a fuse wire (F1), a first varistor (RV1), a second varistor (RV2), a third varistor (RV3), a gas discharge tube (GDT1), and a thermistor (NTC1); One end of the fuse wire (F1) is connected to a live wire (L) of the charging circuit (10), the other end of the fuse wire (F1) is connected to one end of the first varistor (RV1) and one end of the second varistor (RV2), the other end of the second varistor (RV2) is connected to one end of the third varistor (RV3) and one end of the gas discharge tube (GDT1), the other end of the gas discharge tube (GDT1) is connected to the ground wire (PE), one end of the thermistor (NTC1) is connected to the other end of the first varistor (RV1), the other end of the third varistor (RV3), and the neutral wire (N) of the charging circuit (10), and the other end of the thermistor (NTC1) is connected to the second filtering unit (312).

14. The charging pile according to claim 13, wherein, The second filtering unit (312) includes a first inductor (L1), a tenth resistor (R12), an eleventh resistor (R13), a sixth capacitor (CX2), a seventh capacitor (CY1), an eighth capacitor (CY2), and a common mode filter (FIT2); One end of the first inductor (L1) is connected to the other end of the fuse wire (F1), the other end of the first inductor (L1) is connected to one end of the tenth resistor (R12), one end of the sixth capacitor (CX2), and the first end (1) of the common mode filter (FIT2), the other end of the tenth resistor (R12) is connected to one end of the eleventh resistor (R13), and the other end of the eleventh resistor (R13) is connected to the other end of the sixth capacitor (CX2), the other end of the thermistor (NTC1), and the fourth end (4) of the common mode filter (FIT2); The rectification unit (313) includes a rectifier bridge (BD1), a first input terminal of the rectifier bridge (BD1) is connected to the second end (2) of the common mode filter (FIT2), a second input terminal of the rectifier bridge (BD1) is connected to the third end (3) of the common mode filter (FIT2), a first output terminal of the rectifier bridge (BD1) is connected to a first ground terminal (PGND), and a second output terminal of the rectifier bridge (BD1) outputs the second voltage (V3).

15. The charging pile according to claim 3, characterized in that, The voltage output module (32) includes: A first voltage output unit (321), connected to the output terminal of the voltage processing module (31) and the relay module (20), for controllably outputting the third voltage (V4) according to the second voltage (V3); A second voltage output unit (322), coupled to the first voltage output unit (321), for outputting a high-potential fourth voltage (V2) to control the voltage output module (32) to supply the third voltage (V4) to the coil; An output control unit (323), connected to the first voltage output unit (321) and the second voltage output unit (322), is configured to control whether the voltage output module (32) outputs the third voltage (V4) according to the fourth voltage (V2).

16. The charging pile according to claim 15, wherein The first voltage output unit (321) includes a ninth capacitor (C1), a twelfth resistor (R4), a sixth diode (D1), a seventh diode (D2), and a transformer (T1A); A first end (3) of the transformer (T1A) is connected to one end of the ninth capacitor (C1) and one end of the twelfth resistor (R4) and is connected to the second voltage (V3), a cathode of the sixth diode (D1) is connected to the other end of the ninth capacitor (C1) and the other end of the twelfth resistor (R4), an anode of the sixth diode (D1) is connected to a second end (1) of the transformer (T1A), a third end (8) of the transformer (T1A) is connected to the coil, and the seventh diode (D2) is connected between a fourth end (9) of the transformer (T1A) and a second ground terminal (GND).

17. The charging pile according to claim 16, wherein, The first voltage output unit (321) further includes a tenth capacitor (CE3), an eleventh capacitor (C3), a thirteenth resistor (R5), and a fourteenth resistor (R6); The thirteenth resistor (R5) is connected between the anode of the sixth diode (D1) and the second end (1) of the transformer (T1A), the tenth capacitor (CE3) is connected between the third end (8) of the transformer (T1A) and the second ground terminal (GND), one end of the fourteenth resistor (R6) is connected to the cathode of the seventh diode (D2), the other end of the fourteenth resistor (R6) is connected to one end of the eleventh capacitor (C3), and the other end of the eleventh capacitor (C3) is connected to the second ground terminal (GND).

18. The charging pile according to claim 16, wherein, The output control unit (323) includes a third transistor (Q1), a first pole of the third transistor (Q1) is connected to the second end (1) of the transformer (T1A), a second pole of the third transistor (Q1) is connected to a first ground terminal (PGND), and a control pole of the third transistor (Q1) is connected to the overvoltage control module (33).

19. The charging pile according to claim 18, wherein, The output control unit (323) further includes a fifteenth resistor (R7), and the fifteenth resistor (R7) is connected between the second pole of the third transistor (Q1) and the first ground terminal (PGND).

20. The charging pile according to claim 19, characterized in that, The second voltage output unit (322) includes a first winding (T1B), a sixteenth resistor (R10), a seventeenth resistor (R11), an eighth diode (D4), and a voltage processing chip (U2); The first winding (T1B) is a part of the transformer (T1A). One end of the first winding (T1B) is connected to the positive electrode of the eighth diode (D4) and one end of the sixteenth resistor (R10). The other end of the first winding (T1B) is connected to one end of the seventeenth resistor (R11) and the first ground terminal (PGND). The negative electrode of the eighth diode (D4) is connected to the power supply pin (VDD) of the voltage processing chip (U2). The drive pin (DRV) of the voltage processing chip (U2) is connected to the control electrode of the third transistor (Q1). The current feedback pin (IFB) of the voltage processing chip (U2) is connected to one end of the fifteenth resistor (R7) and the second electrode of the third transistor (Q1). The compensation pin (COMP) of the voltage processing chip (U2) is connected to the first ground terminal (PGND). The voltage feedback pin (VFB) of the voltage processing chip (U2) is connected to the other end of the sixteenth resistor (R10) and the other end of the seventeenth resistor (R11).

21. The charging pile according to claim 20, wherein, The second voltage output unit (322) further includes a twelfth capacitor (CE1), a thirteenth capacitor (C4), an eighteenth resistor (R14), a nineteenth resistor (R8), a twentieth resistor (R9), and a ninth diode (D3); The twelfth capacitor (CE1) is connected between the negative electrode of the eighth diode (D4) and the first ground terminal (PGND). The thirteenth capacitor (C4) is connected between the compensation pin (COMP) and the first ground terminal (PGND). The eighteenth resistor (R14) is connected in parallel with the thirteenth capacitor (C4). The nineteenth resistor (R8) is connected between the drive pin (DRV) and the control electrode of the third transistor (Q1). The anode of the ninth diode (D3) is connected to the control electrode of the third transistor (Q1). The cathode of the ninth diode (D3) is connected to one end of the twentieth resistor (R9). The other end of the twentieth resistor (R9) is connected to the drive pin (DRV).

22. The charging pile according to claim 21, wherein The second voltage output unit (322) further includes a twelfth diode (D5), a fourteenth capacitor (CE4), and a twenty - first resistor (R17); The positive electrode of the twelfth diode (D5) is connected to the positive electrode of the eighth diode (D4). The negative electrode of the twelfth diode (D5) is connected to one end of the fourteenth capacitor (CE4) and one end of the twenty - first resistor (R17). The other end of the fourteenth capacitor (CE4) is connected to the first ground terminal (PGND). The other end of the twenty - first resistor (R17) is connected to the first power supply terminal (VCC1).

23. The charging pile according to any one of claims 1-6, characterized in that, The charging pile further includes a control module (40), which is connected to the charging circuit (10) and the relay module (20), and is configured to control the normal power supply of the coil when at least one of the charging circuit (10) and the relay module (20) is in a normal state and the charging circuit (10) is not in the overvoltage state.

24. The charging pile according to claim 23, characterized in that, The control module (40) is configured to perform at least one of the following steps: Detect whether the ground wire (PE) in the charging circuit (10) is grounded; Detect whether the current in the charging circuit (10) is in an overcurrent state; Detect whether the charging circuit (10) is in a leakage current state; Detect whether the contacts of the relay module (20) are stuck.

25. A charging system, characterized in that, The charging system includes the charging pile according to any one of claims 1-24.

26. A vehicle, characterized in that, The vehicle is configured to be connected to the charging pile according to any one of claims 1-24 during charging; or, the vehicle is configured to be connected to the charging system according to claim 25 during charging.

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