High-voltage interlock circuit and method of detecting same, electric vehicle

Abstract

The application relates to the field of high-voltage safety technology of electric vehicles, and discloses a high-voltage interlocking circuit, a detection method thereof and an electric vehicle; the high-voltage interlocking circuit is provided with two groups of differential resistance differential network circuits which are differential with each other, and the two groups of resistance differential network circuits are proportional resistance network circuits, the formed differential voltage signals have high anti-interference ability, the effect is more obvious after the aging of the vehicle electrical system, the degree of distinction is high when the charging and discharging interlocking fault occurs, the interlocking fault can be easily identified, the high-impedance differential amplification circuit can eliminate the coupling noise signals on the wire harness and the interlocking terminals, an MCU unit is arranged, the self-own ADC acquisition circuit of the MCU unit acquires corresponding analog quantities and converts the analog quantities, the high-voltage interlocking state is quickly distinguished, and the safety of the vehicle is ensured.

Description

Technical Field

[0001] This invention relates to the field of high-voltage safety technology for electric vehicles, specifically to high-voltage interlock circuits and their detection methods, and electric vehicles. Background Technology

[0002] High-voltage interlock (HVIL) is a critical safety mechanism in the high-voltage system of electric vehicles. It monitors the integrity of the high-voltage circuit using low-voltage signals to ensure that the high-voltage connector will not accidentally disconnect under non-human-caused circumstances. In existing technologies, HVIL is typically self-transmitted and self-received by the BMS using a PWM signal or a 4-20mA current source. The entire high-voltage interlock loop outside the BMS includes the interlock harness and high-voltage interlock terminals. Because the high-voltage interlock terminals are located inside the high-voltage connector close to the high-voltage terminals, they are highly susceptible to interference from strong sudden current changes. Sometimes, it is also necessary to identify charging and discharging interlock faults, necessitating the design of two sets of interlock circuits, resulting in higher costs. Although using a PWM signal or a 4-20mA current source significantly reduces the probability of false alarms due to signal interference, the risk of interference still exists, especially after several years of use when the electrical components of an electric vehicle age, and the further deterioration of the electromagnetic environment exacerbates this phenomenon. Summary of the Invention

[0003] To overcome the aforementioned technical problems, this invention provides a high-voltage interlock circuit. This high-voltage interlock circuit uses two sets of differential resistor network circuits, which are proportional resistor network circuits. The resulting differential voltage signal has strong anti-interference capability, which is more pronounced after the vehicle's electrical system ages. It has high distinguishability when a charging / discharging interlock fault occurs, making it easy to identify. The high-impedance differential amplifier circuit can eliminate coupled noise signals on the wiring harness and interlock terminals. An MCU unit is included, and its own ADC acquisition circuit acquires and converts the corresponding analog signals to quickly identify the high-voltage interlock status, ensuring vehicle safety.

[0004] To achieve the above objectives, the present invention provides a high-voltage interlock circuit, the high-voltage interlock circuit comprising: A first resistor differential network circuit, comprising: The first resistor, one end of which is connected to an external DC power supply; A second resistor, one end of which is connected to the other end of the first resistor; A third resistor, one end of which is connected to one end of the second resistor; A fourth resistor, one end of which is connected to the other end of the third resistor; The fifth resistor, one end of which is connected to one end of the fourth resistor; A sixth resistor, one end of which is connected to the other end of the fifth resistor, and the other end of which is grounded; The second resistor differential network circuit includes: The seventh resistor, one end of which is connected to an external DC power supply; The eighth resistor, one end of which is connected to the other end of the seventh resistor; The ninth resistor, one end of which is connected to one end of the eighth resistor; The tenth resistor, one end of which is connected to the other end of the ninth resistor; The eleventh resistor, one end of which is connected to one end of the tenth resistor; The twelfth resistor has one end connected to the other end of the eleventh resistor, and the other end of the twelfth resistor is grounded. A charging connector, wherein the first end of the charging connector is connected to the other end of the second resistor, the second end of the charging connector is connected to the other end of the eighth resistor, the third end of the charging connector is connected to the other end of the third resistor, and the fourth end of the charging connector is connected to the other end of the ninth resistor. A discharge connector, wherein the first end of the discharge connector is connected to the other end of the fourth resistor, the second end of the discharge connector is connected to the other end of the tenth resistor, the third end of the discharge connector is connected to the other end of the fifth resistor, and the fourth end of the discharge connector is connected to the other end of the eleventh resistor. A high-impedance differential amplifier circuit, wherein the first terminal of the high-impedance differential amplifier circuit is connected to one end of the sixth resistor, and the second terminal of the high-impedance differential amplifier circuit is connected to one end of the twelfth resistor; The MCU unit is equipped with an ADC acquisition circuit, which is connected to the third terminal of the high-impedance differential amplifier circuit.

[0005] Preferably, the charging connector includes: A first charging differential harness, one end of which is connected to the first end of the charging connector; A second charging differential harness, one end of which is connected to the second end of the charging connector; The third charging differential harness, one end of which is connected to the third end of the charging connector; A fourth charging differential harness, one end of which is connected to the fourth end of the charging connector; The charger has a dual-terminal interlock system, wherein the first end of the dual-terminal interlock system is connected to the other end of the first charging differential harness; the second end of the dual-terminal interlock system is connected to the other end of the second charging differential harness; the third end of the dual-terminal interlock system is connected to the other end of the third charging differential harness; and the fourth end of the dual-terminal interlock system is connected to the other end of the fourth charging differential harness.

[0006] Preferably, the discharge connector includes: A first discharge differential harness, one end of which is connected to the first end of the discharge connector; The second discharge differential wiring harness has one end connected to the second end of the discharge connector; The third discharge differential harness, one end of which is connected to the third end of the discharge connector; A fourth discharge differential harness, one end of which is connected to the fourth end of the discharge connector; The discharger has a two-terminal interlocking device, the first end of which is connected to the other end of the first discharge differential harness; the second end of which is connected to the other end of the second discharge differential harness; the third end of which is connected to the other end of the third discharge differential harness; and the fourth end of which is connected to the other end of the fourth discharge differential harness.

[0007] Preferably, the resistance values ​​of the first, sixth, seventh, and twelfth resistors are R; the resistance values ​​of the second, third, tenth, and eleventh resistors are 2R; the resistance values ​​of the fourth and fifth resistors are 4R; and the resistance values ​​of the eighth and ninth resistors are 8R.

[0008] Preferably, the high-impedance differential amplifier circuit includes: The thirteenth resistor, one end of which is connected to the second terminal of the high-impedance differential amplifier circuit; A first operational amplifier, the positive terminal of which is connected to the other end of the thirteenth resistor; A first capacitor, one end of which is connected to the other end of the thirteenth resistor, and the other end of which is grounded; The fifteenth resistor has one end connected to the negative terminal of the first operational amplifier and the other end connected to the output terminal of the first operational amplifier. The fourteenth resistor, one end of which is connected to the first terminal of the high-impedance differential amplifier circuit; The second operational amplifier, the positive terminal of which is connected to the other end of the fourteenth resistor; The second capacitor has one end connected to the other end of the fourteenth resistor, and the other end of the second capacitor is grounded. The sixteenth resistor has one end connected to the negative terminal of the second operational amplifier and the other end connected to the output terminal of the second operational amplifier. The seventeenth resistor has one end connected to one end of the fifteenth resistor and the other end connected to one end of the sixteenth resistor. The eighteenth resistor, one end of which is connected to the other end of the fifteenth resistor; The nineteenth resistor, one end of which is connected to the other end of the sixteenth resistor; The twentieth resistor has one end connected to the other end of the nineteenth resistor, and the other end of the twentieth resistor is grounded. The third operational amplifier, the negative terminal of which is connected to the other end of the eighteenth resistor, and the positive terminal of which is connected to the other end of the nineteenth resistor; The twenty-first resistor has one end connected to the other end of the eighteenth resistor, and the other end of the twenty-first resistor is connected to the output terminal of the third operational amplifier. The 22nd resistor has one end connected to the other end of the 21st resistor, and the other end of the 22nd resistor is connected to the third terminal of the high-impedance differential amplifier circuit. The third capacitor has one end connected to the other end of the second twelfth resistor, and the other end of the third capacitor is grounded.

[0009] A second aspect of the present invention provides a method for detection using a high-voltage interlock circuit as described in any of the preceding claims, the method comprising: Obtain the voltage drop across the sixth resistor in the first resistor differential network circuit. Voltage division of the twelfth resistor in the second resistor differential network circuit ; The differential voltage acquired by the ADC acquisition circuit is obtained according to formula (1). , (1) in, This represents the amplification factor of a high-impedance differential amplifier circuit. The opening and closing status of the discharger interlocked dual terminals and the charger interlocked dual terminals are obtained by comparing the collected differential voltage with the theoretical value.

[0010] A third aspect of the present invention provides an electric vehicle, the electric vehicle including a high-voltage interlock circuit as described in any of the preceding claims.

[0011] Through the above technical solution, the high-voltage interlock circuit uses two sets of differential resistor network circuits, both of which are proportional resistor network circuits. The resulting differential voltage signal has strong anti-interference capability, which is more obvious after the vehicle's electrical system ages. It also has high distinguishability when charging and discharging interlock faults occur, making it easy to identify. The charging and discharging connectors are equipped with interlocked double-terminal structures, which provide a stable mechanical connection and effectively resist signal interruption caused by vibration. Four differential wire harnesses are set to connect to the four ends of the interlocked double terminals, providing high safety redundancy and more stable signals. The high-impedance differential amplifier circuit can eliminate coupled noise signals on the wire harnesses and interlock terminals. An MCU unit is set up, and the MCU unit's own ADC acquisition circuit collects and converts the corresponding analog signals to quickly identify the high-voltage interlock status, ensuring vehicle safety. Attached Figure Description

[0012] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a circuit connection diagram of a high-voltage interlock circuit according to one embodiment of the present invention.

[0013] Explanation of reference numerals in the attached figures Detailed Implementation

[0014] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0015] like Figure 1 The diagram shown is a circuit connection schematic of a high-voltage interlock circuit according to an embodiment of the present invention; Figure 1In the high-voltage interlock circuit, there are a first resistor differential network circuit 1, a second resistor differential network circuit 2, a charging connector 3, a discharging connector 4, a high-impedance differential amplifier circuit 5, and an MCU unit 6. Specifically, in the first resistor differential network circuit 1 and the second resistor differential network circuit 2, one end of the first resistor R1 is connected to an external DC power supply, one end of the second resistor R2 is connected to the other end of the first resistor R1, one end of the third resistor R3 is connected to one end of the second resistor R2, one end of the fourth resistor R4 is connected to the other end of the third resistor R3, one end of the fifth resistor R5 is connected to one end of the fourth resistor R4, one end of the sixth resistor R6 is connected to the other end of the fifth resistor R5, and the other end of the sixth resistor R6 is grounded; one end of the seventh resistor R7 is connected to an external DC power supply, one end of the eighth resistor R8 is connected to the other end of the seventh resistor R7, one end of the ninth resistor R9 is connected to one end of the eighth resistor R8, one end of the tenth resistor R10 is connected to the other end of the ninth resistor R9, and one end of the eleventh resistor R11 is connected to one end of the tenth resistor R10. One end of the 12th resistor R12 is connected to the other end of the 11th resistor R11, and the other end of the 12th resistor R12 is grounded. The first end 301 of the charging connector is connected to the other end of the second resistor R2, the second end 302 of the charging connector is connected to the other end of the eighth resistor R8, the third end 303 of the charging connector is connected to the other end of the third resistor R3, and the fourth end 304 of the charging connector is connected to the other end of the ninth resistor R9. The first end 401 of the discharging connector is connected to the other end of the fourth resistor R4, the second end 402 of the discharging connector is connected to the other end of the tenth resistor R10, the third end 403 of the discharging connector is connected to the other end of the fifth resistor R5, and the fourth end 404 of the discharging connector is connected to the other end of the 11th resistor R11. The first end 501 of the high impedance differential amplifier circuit is connected to one end of the sixth resistor R6, and the second end 502 of the high impedance differential amplifier circuit is connected to one end of the 12th resistor R12. The MCU unit 6 is equipped with an ADC acquisition circuit 61, which is connected to the third end 503 of the high impedance differential amplifier circuit.

[0016] This high-voltage interlock circuit uses two sets of differential resistor networks, both of which are proportional resistor networks. The resulting differential voltage signal has strong anti-interference capabilities, which are even more pronounced after the vehicle's electrical system ages. It also has high distinguishability and is easy to identify when a charging / discharging interlock fault occurs. The high-impedance differential amplifier circuit can eliminate coupled noise signals on the wiring harness and interlock terminals. An MCU unit is also included, whose built-in ADC acquisition circuit acquires and converts the corresponding analog signals to quickly identify the high-voltage interlock status, ensuring vehicle safety.

[0017] exist Figure 1In order to achieve high-quality signal transmission during charging connection and ensure extremely high connection security, in one embodiment of the present invention, the charging connector 3 includes a first, second, third, and fourth charging differential harness. One end of the first charging differential harness 31 is connected to the first end 301 of the charging connector, one end of the second charging differential harness 32 is connected to the second end 302 of the charging connector, one end of the third charging differential harness 33 is connected to the third end 303 of the charging connector, and one end of the fourth charging differential harness 34 is connected to the fourth end 304 of the charging connector. The first end 351 of the charger interlock dual terminal is connected to the other end of the first charging differential harness 31; the second end 352 of the charger interlock dual terminal is connected to the other end of the second charging differential harness 32; the third end 353 of the charger interlock dual terminal is connected to the other end of the third charging differential harness 33; and the fourth end 354 of the charger interlock dual terminal is connected to the other end of the fourth charging differential harness 34. The ingenious combination of interlocked dual terminals and differential wiring harness inside the charging connector 3 provides strong anti-interference capabilities, meets the needs of real-time transmission, and the dual terminals provide redundant safety and a secure connection to prevent accidental disconnection. Overall robustness is enhanced, ensuring stable operation, reducing failure rate, extending service life, and ensuring vehicle safety in the face of factors such as vibration in complex working environments.

[0018] exist Figure 1 In order to achieve high-quality signal transmission during discharge connection while ensuring extremely high connection security, in one embodiment of the present invention, the discharge connector 4 includes first, second, third, and fourth discharge differential wire harnesses. One end of the first discharge differential wire harness 41 is connected to the first end 401 of the discharge connector, one end of the second discharge differential wire harness 42 is connected to the second end 402 of the discharge connector, one end of the third discharge differential wire harness 43 is connected to the third end 403 of the discharge connector, and one end of the fourth discharge differential wire harness 44 is connected to the fourth end 404 of the discharge connector. The first end 451 of the discharger interlocking dual terminal is connected to the other end of the first discharge differential wire harness 41; the second end 452 of the discharger interlocking dual terminal is connected to the other end of the second discharge differential wire harness 42; the third end 453 of the discharger interlocking dual terminal is connected to the other end of the third discharge differential wire harness 43; and the fourth end 454 of the discharger interlocking dual terminal is connected to the other end of the fourth discharge differential wire harness 44. The clever combination of the interlocking dual terminals and differential wiring harness inside the discharge connector 4 provides strong anti-interference capabilities, meets the needs of real-time transmission, and the dual terminals provide redundant safety and a firm connection to prevent accidental disconnection. Overall robustness is enhanced, and it can ensure stable operation, reduce failure rate, extend service life, and ensure vehicle safety in the face of factors such as vibration in complex working environments.

[0019] To facilitate the subsequent calculation and differentiation of the voltages acquired by the ADC acquisition circuit 61, and to simplify the analysis and calculation, in one embodiment of the present invention, the resistance values ​​of the first resistor R1, the sixth resistor R6, the seventh resistor R7, and the twelfth resistor R12 are R; the resistance values ​​of the second resistor R2, the third resistor R3, the tenth resistor R10, and the eleventh resistor R11 are 2R; the resistance values ​​of the fourth resistor R4 and the fifth resistor R5 are 4R; and the resistance values ​​of the eighth resistor R8 and the ninth resistor R9 are 8R. By reasonably setting the resistance values ​​within the first and second resistor differential network circuits, during the acquisition and calculation process, when the double interlock terminals are open and closed, the impedance of the entire first and second resistor differential network circuit and the amplified differential voltage can be as shown in Table 1 below. Table 1

[0020] In Table 1, V represents the voltage of the DC power supply. When the charging interlock terminals are open and the discharging interlock terminals are open, the voltage value acquired by the ADC acquisition circuit 61 is the amplified voltage of the DC power supply. When the charging interlock terminals are open and the discharging interlock terminals are closed, the voltage value acquired by the ADC acquisition circuit 61 is equal to the amplified DC power supply voltage. When the charging interlock terminals are closed and the discharging interlock terminals are open, the voltage value acquired by the ADC acquisition circuit 61 is equal to the amplified DC power supply voltage. When the charging interlock terminals are closed and the discharging interlock terminals are closed, the voltage value acquired by the ADC acquisition circuit 61 is equal to the amplified DC power supply voltage. This allows for comparison based on the differential voltage acquired by the ADC, thus identifying the state of the high-voltage interlock.

[0021] exist Figure 1In order to obtain differential voltage, improve acquisition accuracy, and reduce the probability of interference, in one embodiment of the present invention, the high-impedance differential amplifier circuit 5 includes first, second, and third operational amplifiers, first, second, and third capacitors, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, and a twenty-second resistor R22; specifically, one end of the thirteenth resistor R13 is connected to the second terminal 502 of the high-impedance differential amplifier circuit, and the first operational amplifier... The positive terminal of amplifier U1 is connected to the other end of the thirteenth resistor R13. One end of the first capacitor C1 is connected to the other end of the thirteenth resistor R13, and the other end of the first capacitor C1 is grounded. One end of the fifteenth resistor R15 is connected to the negative terminal of the first operational amplifier U1, and the other end of the fifteenth resistor R15 is connected to the output terminal of the first operational amplifier U1. One end of the fourteenth resistor R14 is connected to the first terminal 501 of the high-impedance differential amplifier circuit. The positive terminal of the second operational amplifier U2 is connected to the other end of the fourteenth resistor R14. One end of the second capacitor C2 is connected to the other end of the fourteenth resistor R14, and the other end of the second capacitor C2 is grounded. One end of the sixteenth resistor R16 is connected to the negative terminal of the second operational amplifier U2, and the other end is connected to the output terminal of the second operational amplifier U2. One end of the seventeenth resistor R17 is connected to one end of the fifteenth resistor R15, and the other end of the seventeenth resistor R17 is connected to one end of the sixteenth resistor R16. One end of the eighteenth resistor R18 is connected to the other end of the fifteenth resistor R15. One end of the nineteenth resistor R19 is connected to the other end of the sixteenth resistor R16. One end of the twentieth resistor R20 is connected to the other end of the nineteenth resistor R19, and the other end of the twentieth resistor R20 is grounded. The negative terminal of the third operational amplifier U3 is connected to the other end of the eighteenth resistor R18. The positive terminal of the third operational amplifier U3 is connected to the other end of the nineteenth resistor R19. One end of the twenty-first resistor R21 is connected to the other end of the eighteenth resistor R18. The other end of the twenty-first resistor R21 is connected to the output terminal of the third operational amplifier U3. One end of the twenty-second resistor R22 is connected to the other end of the twenty-first resistor R21. The other end of the twenty-second resistor R22 is connected to the third terminal 503 of the high-impedance differential amplifier circuit. One end of the third capacitor C3 is connected to the other end of the twenty-second resistor R22. The other end of the third capacitor C3 is grounded.

[0022] A second aspect of the present invention provides a method for detection using a high-voltage interlock circuit as described in any of the preceding claims, the method comprising the following steps: obtaining the voltage drop across the sixth resistor in the first differential resistor network circuit 1. Voltage division of the twelfth resistor in the second resistor differential network circuit 2 ; The differential voltage acquired by the ADC acquisition circuit 61 is obtained according to formula (1). , (1) in, This is the amplification factor of the high-impedance differential amplifier circuit 5; The opening and closing status of the discharger interlocked dual terminals and the charger interlocked dual terminals are obtained by comparing the collected differential voltage with the theoretical value.

[0023] By implementing voltage division acquisition of the sixth and twelfth resistors and obtaining differential voltage through differential amplification, the opening and closing status of the interlocked dual terminals can be identified by comparing the differential voltage with the theoretical value, thereby determining whether a fault has occurred and ensuring the safety of electric vehicles.

[0024] A third aspect of the present invention provides an electric vehicle, the electric vehicle including a high-voltage interlock circuit as described in any of the preceding claims.

[0025] Through the above technical solution, the high-voltage interlock circuit uses two sets of differential resistor network circuits, both of which are proportional resistor network circuits. The resulting differential voltage signal has strong anti-interference capability, which is more obvious after the vehicle's electrical system ages. It also has high distinguishability when charging and discharging interlock faults occur, making it easy to identify. The charging and discharging connectors are equipped with interlocked double-terminal structures, which provide a stable mechanical connection and effectively resist signal interruption caused by vibration. Four differential wire harnesses are set to connect to the four ends of the interlocked double terminals, providing high safety redundancy and more stable signals. The high-impedance differential amplifier circuit can eliminate coupled noise signals on the wire harnesses and interlock terminals. An MCU unit is set up, and the MCU unit's own ADC acquisition circuit collects and converts the corresponding analog signals to quickly identify the high-voltage interlock status, ensuring vehicle safety.

[0026] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all fall within the protection scope of the present invention. Furthermore, it should be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0027] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A high-voltage interlock circuit, characterized in that, The high-voltage interlock circuit includes: A first resistor differential network circuit, comprising: The first resistor, one end of which is connected to an external DC power supply; A second resistor, one end of which is connected to the other end of the first resistor; A third resistor, one end of which is connected to one end of the second resistor; A fourth resistor, one end of which is connected to the other end of the third resistor; The fifth resistor, one end of which is connected to one end of the fourth resistor; A sixth resistor, one end of which is connected to the other end of the fifth resistor, and the other end of which is grounded; The second resistor differential network circuit includes: The seventh resistor, one end of which is connected to an external DC power supply; The eighth resistor, one end of which is connected to the other end of the seventh resistor; The ninth resistor, one end of which is connected to one end of the eighth resistor; The tenth resistor, one end of which is connected to the other end of the ninth resistor; The eleventh resistor, one end of which is connected to one end of the tenth resistor; The twelfth resistor has one end connected to the other end of the eleventh resistor, and the other end of the twelfth resistor is grounded. A charging connector, wherein the first end of the charging connector is connected to the other end of the second resistor, the second end of the charging connector is connected to the other end of the eighth resistor, the third end of the charging connector is connected to the other end of the third resistor, and the fourth end of the charging connector is connected to the other end of the ninth resistor. A discharge connector, wherein the first end of the discharge connector is connected to the other end of the fourth resistor, the second end of the discharge connector is connected to the other end of the tenth resistor, the third end of the discharge connector is connected to the other end of the fifth resistor, and the fourth end of the discharge connector is connected to the other end of the eleventh resistor. A high-impedance differential amplifier circuit, wherein the first terminal of the high-impedance differential amplifier circuit is connected to one end of the sixth resistor, and the second terminal of the high-impedance differential amplifier circuit is connected to one end of the twelfth resistor; The MCU unit is equipped with an ADC acquisition circuit, which is connected to the third terminal of the high-impedance differential amplifier circuit.

2. The high-voltage interlock circuit according to claim 1, characterized in that, The charging connector includes: A first charging differential harness, one end of which is connected to the first end of the charging connector; A second charging differential harness, one end of which is connected to the second end of the charging connector; The third charging differential harness, one end of which is connected to the third end of the charging connector; A fourth charging differential harness, one end of which is connected to the fourth end of the charging connector; The charger has a dual-terminal interlock system, wherein the first end of the dual-terminal interlock system is connected to the other end of the first charging differential harness; the second end of the dual-terminal interlock system is connected to the other end of the second charging differential harness; the third end of the dual-terminal interlock system is connected to the other end of the third charging differential harness; and the fourth end of the dual-terminal interlock system is connected to the other end of the fourth charging differential harness.

3. The high-voltage interlock circuit according to claim 1, characterized in that, The discharge connector includes: A first discharge differential harness, one end of which is connected to the first end of the discharge connector; The second discharge differential wiring harness has one end connected to the second end of the discharge connector; The third discharge differential harness, one end of which is connected to the third end of the discharge connector; A fourth discharge differential harness, one end of which is connected to the fourth end of the discharge connector; The discharger has a two-terminal interlocking device, the first end of which is connected to the other end of the first discharge differential harness; the second end of which is connected to the other end of the second discharge differential harness; the third end of which is connected to the other end of the third discharge differential harness; and the fourth end of which is connected to the other end of the fourth discharge differential harness.

4. The high-voltage interlock circuit according to claim 1, characterized in that, The resistance values ​​of the first, sixth, seventh, and twelfth resistors are R; the resistance values ​​of the second, third, tenth, and eleventh resistors are 2R; the resistance values ​​of the fourth and fifth resistors are 4R; and the resistance values ​​of the eighth and ninth resistors are 8R.

5. The high-voltage interlock circuit according to claim 1, characterized in that, The high-impedance differential amplifier circuit includes: The thirteenth resistor, one end of which is connected to the second terminal of the high-impedance differential amplifier circuit; A first operational amplifier, the positive terminal of which is connected to the other end of the thirteenth resistor; A first capacitor, one end of which is connected to the other end of the thirteenth resistor, and the other end of which is grounded; The fifteenth resistor has one end connected to the negative terminal of the first operational amplifier and the other end connected to the output terminal of the first operational amplifier. The fourteenth resistor, one end of which is connected to the first terminal of the high-impedance differential amplifier circuit; The second operational amplifier, the positive terminal of which is connected to the other end of the fourteenth resistor; The second capacitor has one end connected to the other end of the fourteenth resistor, and the other end of the second capacitor is grounded. The sixteenth resistor has one end connected to the negative terminal of the second operational amplifier and the other end connected to the output terminal of the second operational amplifier. The seventeenth resistor has one end connected to one end of the fifteenth resistor and the other end connected to one end of the sixteenth resistor. The eighteenth resistor, one end of which is connected to the other end of the fifteenth resistor; The nineteenth resistor, one end of which is connected to the other end of the sixteenth resistor; The twentieth resistor has one end connected to the other end of the nineteenth resistor, and the other end of the twentieth resistor is grounded. The third operational amplifier, the negative terminal of which is connected to the other end of the eighteenth resistor, and the positive terminal of which is connected to the other end of the nineteenth resistor; The twenty-first resistor has one end connected to the other end of the eighteenth resistor, and the other end of the twenty-first resistor is connected to the output terminal of the third operational amplifier. The 22nd resistor has one end connected to the other end of the 21st resistor, and the other end of the 22nd resistor is connected to the third terminal of the high-impedance differential amplifier circuit. The third capacitor has one end connected to the other end of the second twelfth resistor, and the other end of the third capacitor is grounded.

6. A method for detection using a high-voltage interlock circuit as described in any one of claims 1-5, characterized in that, The method includes: Obtain the voltage drop across the sixth resistor in the first resistor differential network circuit. Voltage division of the twelfth resistor in the second resistor differential network circuit ; The differential voltage acquired by the ADC acquisition circuit is obtained according to formula (1). , ，（1） in, This represents the amplification factor of a high-impedance differential amplifier circuit. The opening and closing status of the discharger interlocked dual terminals and the charger interlocked dual terminals are obtained by comparing the collected differential voltage with the theoretical value.

7. An electric vehicle, characterized in that, The electric vehicle includes a high-voltage interlock circuit as described in any one of claims 1-5.

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