High-voltage interlock detection circuit, high-voltage system, and vehicle

Abstract

The application discloses a high-voltage interlocking detection circuit, a high-voltage system and a vehicle, relates to the technical field of high-voltage detection, and comprises a power domain module, the power domain module is arranged on a circuit board, wherein a first high-voltage device in the power domain module is connected in series with a first end of a high-voltage interlocking detector in the power domain module through a copper wire of the circuit board; an external high-voltage module is connected in series with a second end of the high-voltage interlocking detector through a low-voltage loop wire harness, wherein the high-voltage interlocking detector is used for performing high-voltage interlocking detection on a second high-voltage device and the first high-voltage device in the external high-voltage module. The application reduces the use of the low-voltage loop wire harness to reduce the cost of the high-voltage interlocking detection circuit.

Description

Technical Field

[0001] This application relates to the field of high voltage detection technology, and in particular to a high voltage interlock detection circuit, a high voltage system, and a vehicle. Background Technology

[0002] As vehicles become increasingly common, users are placing higher demands on the design of high-voltage interlock detection circuits in vehicles.

[0003] Traditional high-voltage interlock detection circuits consist of a controller responsible for sending and receiving low-voltage signals, various high-voltage components including the power battery, and a low-voltage return line harness connected in series with all of these components. The controller detects the integrity and continuity of the connections between the various high-voltage components. However, this design has certain drawbacks. The low-voltage return line harness requires all high-voltage components to be connected in series to achieve high-voltage interlock detection. This increases the cost of the high-voltage interlock detection circuit due to the increased number of low-voltage return line harnesses used. Utility Model Content

[0004] The main objective of this application is to provide a high-voltage interlock detection circuit and vehicle, which aims to solve the technical problem of increased cost of high-voltage interlock detection circuits due to the extensive use of low-voltage return line harnesses.

[0005] To achieve the above objectives, this application provides a high-voltage interlock detection circuit, which includes: A power domain module is mounted on a circuit board, wherein a first high-voltage device in the power domain module is connected in series with the first end of a high-voltage interlock detector in the power domain module via copper traces on the circuit board. An external high-voltage module is connected in series at the second end of the high-voltage interlock detector via a low-voltage return line harness. The high-voltage interlock detector is used to perform high-voltage interlock detection on the second high-voltage device and the first high-voltage device in the external high-voltage module.

[0006] In one embodiment, the first end of the high-voltage interlock detector includes a first detection input end and a first detection output end, and the power domain module includes a plurality of first high-voltage devices, each of the first high-voltage devices including a first connector, and each of the first connectors being connected in series through the copper-clad wire. The first terminal of the first connector of the first high-voltage device is connected to the first detection input terminal through the copper-clad wire, and the first connector of the last high-voltage device is connected to the first detection output terminal through the copper-clad wire. The first high-voltage device includes a battery management system, a motor control unit, and an on-board charger.

[0007] In one embodiment, the second end of the high-voltage interlock detector includes a second detection input end and a second detection output end, the external high-voltage module includes a plurality of second high-voltage devices, each of the second high-voltage devices includes a second connector, and each of the second connectors is connected in series through the low-voltage return line harness; The first end of the second connector of the first second high-voltage device is connected to the second detection input terminal through the low-voltage return line harness, and the second connector of the last second high-voltage device is connected to the second detection output terminal through the low-voltage return line harness. The second high-voltage device includes a thermal management component.

[0008] In one embodiment, the second high-voltage device further includes a third connector, which is connected in series between the first detection input terminal and the first detection output terminal in the high-voltage interlock detector via the copper-clad wire.

[0009] In one embodiment, the high-voltage interlock detection circuit includes: An interlock control switch is connected between the positive and negative terminals of the vehicle's power battery. An interlock control module is provided, wherein the first end of the interlock control module is connected to the control end of the interlock control switch, the second end of the interlock control module is connected to the detection output end of the high-voltage interlock detector, and the second end of the interlock control module is connected to the vehicle controller.

[0010] In one embodiment, the interlock control module includes: The first AND gate device has its first input terminal serving as the second terminal of the interlock control module and connected to the detection output terminal of the high-voltage interlock detector. The second input terminal of the first AND gate device serves as the second terminal of the interlock control module and is connected to the vehicle controller. The output terminal of the first AND gate device serves as the first terminal of the interlock control module and is connected to the control terminal of the interlock control switch. Specifically, the first AND gate is configured such that when both its first and second input terminals are high, the interlock control switch is controlled to disconnect the connection between the positive and negative terminals of the power battery.

[0011] In one embodiment, the vehicle controller includes a speed pedal output port and a power-off command output port, and the interlock control module further includes: A second AND gate device, wherein the first input terminal of the second AND gate device is connected to the speed pedal output port, the second input terminal of the second AND gate device is connected to the power-off command output port, and the output terminal of the second AND gate device is connected to the second input terminal of the first AND gate device; Specifically, when the second AND gate is configured such that either its first input or its second input is both at a high level, its output is at a high level.

[0012] In addition, to achieve the above objectives, this application also provides a high-voltage system, which includes the above-mentioned high-voltage interlock detection circuit and power battery; The positive and negative terminals of the power battery are connected in series with the first high-voltage device in the power domain module and the second high-voltage device in the external high-voltage module.

[0013] In one embodiment, the high-voltage system further includes: An electric motor, which is connected to a motor control unit in the power domain module; A low-voltage control port is connected to the motor control unit, battery management system, and on-board charger in the power domain module. A charging port, which is connected to the on-board charger.

[0014] In addition, to achieve the above objectives, this application also provides a vehicle that includes the aforementioned high-voltage system.

[0015] This application provides a high-voltage interlock detection circuit, including a power domain module mounted on a circuit board. A first high-voltage device in the power domain module is connected in series with a high-voltage interlock detector in the power domain module via copper traces on the circuit board. An external high-voltage module is connected in series with a low-voltage return line harness at the second end of the high-voltage interlock detector. The high-voltage interlock detector is used to perform high-voltage interlock detection on the second high-voltage device and the first high-voltage device in the external high-voltage module. This high-voltage interlock detection circuit, by mounting the power domain module on the circuit board and using the copper traces on the circuit board to replace the connection function of the low-voltage return line harness, achieves high-voltage interlock detection on the first high-voltage device in the power domain module. Simultaneously, it directly connects the low-voltage return line harness to the second high-voltage device in the external high-voltage module to achieve high-voltage interlock detection on the second high-voltage device. This eliminates the need for the low-voltage return line harness to connect all high-voltage components in series to achieve high-voltage interlock detection. In other words, by integrating multiple first high-voltage devices on the circuit board using the power domain module and connecting them with copper traces to achieve high-voltage interlock detection, the low-voltage return line harness originally required for the first high-voltage device can be reduced, thereby lowering the cost of the high-voltage interlock detection circuit. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the framework of the first embodiment of the high-voltage interlock detection circuit of this application; Figure 2 This is a circuit diagram of the second embodiment of the high-voltage interlock detection circuit of this application; Figure 3 This is a circuit diagram of the third embodiment of the high-voltage interlock detection circuit of this application; Figure 4 This is another circuit diagram of the third embodiment of the high-voltage interlock detection circuit of this application; Figure 5 This is a circuit diagram of the third embodiment of the high-voltage interlock detection circuit of this application; Figure 6 This is a schematic diagram of the framework of the first embodiment of the high-voltage system of this application.

[0017] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0018] Explanation of icon numbers: 200, Circuit board; 201, Copper-clad wire; 10, Power domain module; 11, First high-voltage device; 12, High-voltage interlock detector; 20, External high-voltage module; 21, Second high-voltage device; 30, Low-voltage return line harness; 70, Power battery; 111, First connector; 211, Second connector; 71, High-voltage copper-clad wire; 212, Third connector; 40, Interlock control switch; 50, Interlock control module; 51, First AND gate device; 52, Second AND gate device; 60, Vehicle controller; 61, Speed ​​pedal output port; 62, Power-off command output port; 300, Motor; 400, Low-voltage control port; 500, Charging port; 101, Motor control unit; 102, Battery management system; 103, On-board charger; 104, High-voltage control module. Detailed Implementation

[0019] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0020] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0021] As the use of high-voltage systems in vehicles becomes increasingly widespread, users are constantly updating the design of HVIL (High Voltage Interlock) detection circuits. The HVIL detection circuit is primarily based on a controller, such as a power domain controller, that sends a low-voltage detection signal to the high-voltage interlock circuit. This signal is typically a PWM (Pulse Width Modulation) wave. This low-voltage signal passes through the entire high-voltage interlock circuit and returns to the power domain controller. If the duty cycle of the received PWM wave is essentially the same as the one sent, then the connection of the entire high-voltage interlock detection circuit can be determined to be complete and continuous. Therefore, the low-voltage return line harness in the high-voltage interlock circuit should at least include several harnesses connected in series with various high-voltage components, including the high-voltage battery. However, if too many high-voltage components need to be connected, the low-voltage return line harness responsible for the high-voltage interlock circuit will be divided into many segments. On the one hand, dividing the low-voltage return line harness into many segments increases the risk of connection failure; on the other hand, too many harnesses increase the overall vehicle weight and harness cost.

[0022] Therefore, based on the shortcomings of the above high-voltage interlock detection circuit, the high-voltage interlock detection circuit of this application is proposed. The main solution of the embodiment of this application is: by setting the power domain module 10 on the circuit board 200, and then using the copper-clad wire 201 of the circuit board 200 to replace the connection function of the low-voltage return line harness 30, the high-voltage interlock detection of the first high-voltage device 11 in the power domain module 10 is realized. At the same time, the low-voltage return line harness 30 is directly connected to the second high-voltage device 21 in the external high-voltage module 20 to realize the high-voltage interlock detection of the second high-voltage device 21. Thus, the phenomenon that the low-voltage return line harness 30 needs to be connected in series with all high-voltage components to realize the high-voltage interlock detection can be eliminated. That is, by integrating multiple first high-voltage devices 11 on the circuit board 200 through the power domain module 10 and using the copper-clad wire 201 for connection to realize the high-voltage interlock detection, the low-voltage return line harness 30 originally required for the first high-voltage device 11 can be reduced, thereby reducing the cost of the high-voltage interlock detection circuit.

[0023] Based on this, the embodiments of this application provide a high-voltage interlock detection circuit, referring to... Figure 1 , Figure 1 This is a schematic diagram of the framework of the first embodiment of the high-voltage interlock detection circuit of this application.

[0024] Reference Figure 1 This application provides a high-voltage interlock detection circuit, which includes: Power domain module 10 is mounted on circuit board 200. The first high voltage device 11 in power domain module 10 is connected in series with the first end of high voltage interlock detector 12 in power domain module 10 through copper-clad wire 201 of circuit board 200. An external high-voltage module 20 is connected in series with the second end of a high-voltage interlock detector 12 via a low-voltage return line harness 30. The high-voltage interlock detector 12 is used to perform high-voltage interlock detection on the second high-voltage device 21 and the first high-voltage device 11 in the external high-voltage module 20.

[0025] For example, considering that the high-voltage components that need to be tested for high-voltage interlock in the original high-voltage system are scattered, resulting in the need for a large number of low-voltage wiring harnesses to connect the various high-voltage components to form the low-voltage wiring harness loop of the entire high-voltage interlock detection circuit, we can consider reducing the length of the external wiring harness of the low-voltage loop of the high-voltage interlock detection circuit by integrating the relevant components. For example, the relevant high-voltage components controlling the vehicle's power drive can be integrated. The vehicle's power drive can include a high-voltage battery (i.e., power battery 70), a motor 300, a battery management system 102, and a motor control unit 101 with an integrated motor controller. Then, by integrating the high-voltage components such as the battery management system 102, motor control unit 101, on-board charger 103, and vehicle controller 50, which belong to the three-electric system, the entire power domain module 10 is formed. The power domain module 10 is set on the circuit board 200. At the same time, the detection function is realized by randomly controlling one of the battery management system 102, motor control unit 101, on-board charger 103, and vehicle controller 50, that is, sending and receiving low-voltage signals as a controller to realize the high-voltage interlock function. For example, the vehicle controller 50 can be used as the high-voltage interlock detector 12. Of course, other controllers can also be used, which are not limited here.

[0026] In this embodiment, based on the design of the power domain module 10, the first high-voltage device 11 is designed on the circuit board 200. The first high-voltage device 11 can then be connected via the copper-clad traces 201 on the circuit board 200, thereby enabling high-voltage interlock detection of the first high-voltage device 11. Since components such as the battery management system 102, motor control unit 101, on-board charger 103, and vehicle controller 50 are used as the first high-voltage device 11 and placed on the circuit board 200, the low-voltage control portion of the first high-voltage device 11 is integrated onto a low-voltage domain control circuit board. Therefore, the circuitry on this circuit board can replace some of the low-voltage wiring harness, thereby reducing the wiring harness of the entire high-voltage interlock detection circuit. For example, the copper-clad traces 201 refer to the copper lines attached to the circuit board 200. Generally, after etching the copper-clad traces 201, there is no concern about disconnection, and broken lines can be directly and visually observed, thus greatly improving the effectiveness and maintainability of subsequent high-voltage interlock detection.

[0027] In one embodiment, the high-voltage interlock detection circuit further includes an external high-voltage module 20, which is connected in series to the second terminal of the high-voltage interlock detector 12 via a low-voltage return line harness 30. This allows for high-voltage interlock detection of a second high-voltage device 21 that is not integrated into the power domain module 10. For example, the second high-voltage device 21 can be a high-voltage component for thermal management, etc. Furthermore, the second high-voltage device 21 not integrated into the power domain module 10 can be integrated onto another circuit board, thus eliminating the need for the low-voltage return line harness 30 and significantly reducing the cost of using it during detection. For example, the low-voltage return line harness 30 can be a common jumper wire, conductor, etc. Because it needs to be connected to the high-voltage interlock detector 12, not only is the low-voltage return line harness 30 required, but pin headers are also needed at the connection point between the high-voltage interlock detector 12 and the second high-voltage device 21, significantly increasing the cost of high-voltage interlock detection. It is worth noting that the advantage of integrating high-voltage components belonging to the three-electric system is that it can avoid interference with other high-voltage components, facilitate centralized maintenance of the high-voltage components of the three-electric system, and integrate functions such as heat dissipation. In this way, it can reduce the need for high-voltage interlock detection while ensuring the convenience of vehicle operation and maintenance.

[0028] In this embodiment, a high-voltage interlock detection circuit is provided, including a power domain module 10, which is mounted on a circuit board 200. A first high-voltage device 11 in the power domain module 10 is connected in series with the first terminal of a high-voltage interlock detector 12 in the power domain module 10 via a copper-clad trace 201 on the circuit board 200. An external high-voltage module 20 is connected in series with the second terminal of the high-voltage interlock detector 12 via a low-voltage return line harness 30. The high-voltage interlock detector 12 is used to perform high-voltage interlock detection on the second high-voltage device 21 and the first high-voltage device 11 in the external high-voltage module 20. This high-voltage interlock detection circuit utilizes the power domain module 10 mounted on the circuit board 200 to perform high-voltage interlock detection on the circuit board 200. The copper-clad wire 201 replaces the connection function of the low-voltage return line harness 30 to realize high-voltage interlock detection of the first high-voltage device 11 in the power domain module 10. At the same time, the low-voltage return line harness 30 is directly used to connect with the second high-voltage device 21 in the external high-voltage module 20 to realize high-voltage interlock detection of the second high-voltage device 21. This eliminates the phenomenon that the low-voltage return line harness 30 needs to be connected in series with all high-voltage components to realize high-voltage interlock detection. That is, by integrating multiple first high-voltage devices 11 on the circuit board 200 through the power domain module 10 and using the copper-clad wire 201 for connection to realize high-voltage interlock detection, the low-voltage return line harness 30 originally needed for the first high-voltage device 11 can be reduced, thereby reducing the cost of the high-voltage interlock detection circuit.

[0029] Furthermore, based on the first embodiment of this application described above, a second embodiment of the high-voltage interlock detection circuit of this application is proposed, referring to... Figure 2 , Figure 2 This is a circuit diagram of the second embodiment of the high voltage interlock detection circuit of this application. The first end of the high voltage interlock detector 12 includes a first detection input end and a first detection output end. The power domain module 10 includes a plurality of first high voltage devices 11. Each first high voltage device 11 includes a first connector 111. Each first connector 111 is connected in series through a copper-clad wire 201. The first terminal of the first connector 111 of the first high-voltage device 11 is connected to the first detection input terminal through the copper-clad wire 201, and the first connector 111 of the last high-voltage device 11 is connected to the first detection output terminal through the copper-clad wire 201. The first high-voltage device 11 includes a battery management system 102, a motor control unit 101, and an on-board charger 103.

[0030] In this embodiment, an independent high-voltage interlock detector 12 is used as the transmitting and receiving unit for the low-voltage interlock signal in the high-voltage interlock detection circuit. A low-voltage signal is emitted by the high-voltage interlock detector 12, which passes through the first connector 111 containing each of the first high-voltage devices 11 before returning to the high-voltage interlock detector 12. If the low-voltage signal detected by the high-voltage interlock detector 12 matches the output signal, the high-voltage interlock detection loop connection is considered normal. For example, the power domain module 10 includes multiple first high-voltage devices 11, each of which includes a first connector 111. Each first connector 111 is connected in series via copper-clad wires 201, thereby achieving high-voltage interlock detection of multiple first high-voltage devices 11 through the series-connected first connectors 111. For example, if one of the first connectors 111 is disconnected, the high-voltage interlock detection loop connection is abnormal. Among them, the high-voltage interlock detector 12 only needs to identify whether the output and return signals are the same, and then determine whether the entire high-voltage interlock detection circuit is normal, because at this time each first connector 111 uses copper-clad wire 201 in series, which reduces the cost of high-voltage interlock detection.

[0031] In one embodiment, both the input and output sides of each first connector 111 can be connected to the high-voltage interlock detector 12. This allows for the identification of the specific first connector 111 that is malfunctioning when an abnormality is detected in the high-voltage interlock detection circuit, based on the signals from the input and output sides of each first connector 111. This only requires adding copper traces 201 during the design phase, without increasing costs. Simultaneously, it allows for precise identification of the malfunctioning high-voltage component for rapid troubleshooting. Furthermore, the high-voltage interlock detector 12 can be configured with different input / output signal correspondences to determine which high-voltage component is malfunctioning, thus alerting the user and improving the intelligence of the high-voltage interlock detection circuit.

[0032] In one embodiment, based on the first and / or second embodiments of this application described above, a third embodiment of the high-voltage interlock detection circuit of this application is proposed, referring to... Figure 3 , Figure 3 This is a circuit diagram of the third embodiment of the high voltage interlock detection circuit of this application. The second end of the high voltage interlock detector 12 includes a second detection input terminal and a second detection output terminal. The external high voltage module 20 includes a plurality of second high voltage devices 21. Each second high voltage device 21 includes a second connector 211. Each second connector 211 is connected in series through a low voltage return line harness 30. The first end of the second connector 211 of the first second high-voltage device 21 is connected to the second detection input terminal through the low-voltage return line harness 30, and the second connector 211 of the last second high-voltage device 21 is connected to the second detection output terminal through the low-voltage return line harness 30. The second high-voltage device 21 includes a thermal management component.

[0033] Furthermore, refer to Figure 4 , Figure 4 This is another circuit diagram of the third embodiment of the high voltage interlock detection circuit of this application. The second high voltage device 21 also includes a third connector 212. The third connector 212 is connected in series between the first detection input terminal and the first detection output terminal in the high voltage interlock detector 12 through a copper-clad wire 201.

[0034] In this embodiment, the external high-voltage module 20 includes multiple second high-voltage devices 21, each of which includes a second connector 211. Each second connector 211 is connected in series via a low-voltage return line harness 30, thereby enabling high-voltage interlock detection of the multiple second high-voltage devices 21 through the series-connected second connectors 211. For example, if one of the second connectors 211 is disconnected, the high-voltage interlock detection loop connection is abnormal. The high-voltage interlock detector 12 only needs to identify whether the output and return signals are the same to determine whether the entire high-voltage interlock detection loop is normal, because the first connectors 111 in the power domain module 10 are connected in series using copper-clad wires 201, thus reducing the cost of high-voltage interlock detection.

[0035] In one embodiment, both the input and output sides of each second connector 211 can be connected to the high-voltage interlock detector 12. This allows for the identification of the specific second connector 211 that is malfunctioning based on the signals from its input and output sides when an abnormality is detected in the high-voltage interlock detection loop. This enables precise identification of the malfunctioning high-voltage component for rapid troubleshooting. Furthermore, the high-voltage interlock detector 12 can be configured with different input / output signal correspondences to determine which high-voltage component is malfunctioning, thus alerting the user and improving the intelligence of the high-voltage interlock detection circuit.

[0036] In one embodiment, based on the first, second, and / or third embodiments of this application described above, a fourth embodiment of the high-voltage interlock detection circuit of this application is proposed, referring to... Figure 5 , Figure 5 This is a circuit diagram of the third embodiment of the high-voltage interlock detection circuit of this application. The high-voltage interlock detection circuit includes: Interlock control switch 40 is connected between the positive and negative terminals of the vehicle's power battery 70; The interlock control module 50 has its first end connected to the control end of the interlock control switch 40, its second end connected to the detection output end of the high-voltage interlock detector 12, and its third end connected to the vehicle controller 60.

[0037] Furthermore, the interlock control module 50 includes: The first AND gate device 51 has its first input terminal serving as the second terminal of the interlock control module 50 and connected to the detection output terminal of the high-voltage interlock detector 12. The second input terminal of the first AND gate device 51 serves as the second terminal of the interlock control module 50 and is connected to the vehicle controller 60. The output terminal of the first AND gate device 51 serves as the first terminal of the interlock control module 50 and is connected to the control terminal of the interlock control switch 40. Specifically, the first AND gate device 51 is configured such that when both its first and second input terminals are input at a high level, the interlock control switch 40 disconnects the connection between the positive and negative terminals of the power battery 70.

[0038] Furthermore, the vehicle controller 60 includes a speed pedal output port 61 and a power-off command output port 62, and the interlock control module 50 also includes: The second AND gate device 52 has its first input terminal connected to the speed pedal output port 61, its second input terminal connected to the power-off command output port 62, and its output terminal connected to the second input terminal of the first AND gate device 51. Specifically, the second AND gate 52 is configured such that when either the first input terminal of the second AND gate 52 or the second input terminal of the second AND gate 52 is input with a high level, the output terminal of the second AND gate 52 outputs a high level.

[0039] In this embodiment, to achieve power-down control in case of high-voltage abnormality, an interlock control switch 40 can be designed to control the power supply or power-down of various high-voltage components. The interlock control switch 40 can be designed at any position between the positive and negative terminals of the power battery 70, and is not limited here. The interlock control switch 40 can be a commonly used high-voltage switch, a voltage-resistant switching transistor, etc. Furthermore, the interlock control module 50 controls the interlock control switch 40 to realize the disconnection and connection of the interlock control switch 40. For example, the interlock control module 50 can be a switch. When the user actively discovers or the high-voltage interlock detection circuit detects a high-voltage abnormality, the switch is used to directly control the interlock control switch 40 to disconnect the connection between the positive and negative terminals of the power battery 70 to ensure safety.

[0040] In one embodiment, the interlock control module 50 may consist of a first AND gate device 51, whose first input terminal is connected to the detection output terminal of the high-voltage interlock detector 12. For example, when the detection output terminal of the high-voltage interlock detector 12 outputs a high level, it indicates a high-voltage abnormality; when it outputs a low level, it indicates a high-voltage normality. For instance, a program can be pre-designed in the high-voltage interlock detector 12 to output a low level when the PWM low-voltage signal input and output are the same, and to output a high level when the PWM low-voltage signal input and output are different. The second input terminal of the first AND gate device 51 serves as the second terminal of the interlock control module 50 and is connected to the vehicle controller 60. This allows the system to determine whether the user allows power-down, or whether the current conditions permit power-down. For example, if the user directly uses a switch to input "allow power-down," the second input terminal of the first AND gate device 51 receives a high level (assuming a high voltage anomaly occurs, and the high voltage interlock detector 12 outputs a high level). When both the first and second input terminals of the first AND gate device 51 receive high levels, the first AND gate device 51 outputs a high level, controlling the interlock control switch 40 to disconnect the connection between the positive and negative terminals of the power battery 70, thus achieving high voltage power-down protection. Alternatively, assuming a high voltage anomaly occurs, and the high voltage interlock detector 12 outputs a high level, but the user does not allow power-down, the second input terminal of the first AND gate device 51 receives a low level, resulting in the first AND gate device 51 outputting a low level. This controls the interlock control switch 40 to continue connecting the positive and negative terminals of the power battery 70, prioritizing user commands and ensuring accurate vehicle control.

[0041] In one embodiment, a second AND gate device 52 can be designed to determine whether the user allows power-off or whether the current conditions permit power-off. This second AND gate device 52 is connected to the speed pedal output port 61 (assuming a high level is output when parking) and the power-off command output port 62 (e.g., controlled by a user button). This detects the current speed. When the speed is the parking speed or the user issues a power-off command, the output of the second AND gate device 52 can be directly controlled to output a high level, resulting in a high level input at the second input of the first AND gate device 51. If neither condition is met, the controller is notified that the user or the environment does not permit power-off, thus ensuring the intelligence of the power-off control. For example, the speed pedal output port 61 can combine other factors for judgment, such as speed and tire speed. For instance, if both speed and tire speed are 0, it indicates parking, allowing direct power-off to ensure safety. When the parking conditions are met, a high level is output.

[0042] Based on the above embodiments of the high-voltage interlock detection circuit, a high-voltage system is proposed, which includes the above-mentioned high-voltage interlock detection circuit and the power battery 70. Among them, the positive and negative terminals of the power battery 70 are connected in series with the first high-voltage device 11 in the power domain module 10 and the second high-voltage device 21 in the external high-voltage module 20.

[0043] In this embodiment, in order to realize high-voltage interlock detection of multiple high-voltage devices in the high-voltage system, the high-voltage interlock detection circuit designed in this application is used to realize high-voltage interlock detection of the first high-voltage device 11 in the power domain module 10 by setting the power domain module 10 on the circuit board 200 and using the copper-clad wires 201 of the circuit board 200 to replace the connection function of the low-voltage return line harness 30. At the same time, the low-voltage return line harness 30 is directly used to connect with the second high-voltage device 21 in the external high-voltage module 20 to realize high-voltage interlock detection of the second high-voltage device 21. This eliminates the phenomenon that the low-voltage return line harness 30 needs to be connected in series with all high-voltage components to realize high-voltage interlock detection. That is, by integrating multiple first high-voltage devices 11 on the circuit board 200 through the power domain module 10 and connecting them with copper-clad wires 201 to realize high-voltage interlock detection, the low-voltage return line harness 30 originally required for the first high-voltage device 11 can be reduced, thereby reducing the cost of the high-voltage interlock detection circuit. It is worth noting that the power battery 70 in the high-voltage system serves as the entire high-voltage output terminal. The positive and negative terminals of the power battery 70 are connected in series with the first high-voltage device 11 in the power domain module 10 and the second high-voltage device 21 in the external high-voltage module 20, thereby realizing the control of high voltage on the first high-voltage device 11 in the power domain module 10 and the second high-voltage device 21 in the external high-voltage module 20. Of course, other connection methods can also be used to achieve high voltage, which will not be described in detail here.

[0044] In one embodiment, reference is made to Figure 6 , Figure 6 This is a schematic diagram of the framework of the first embodiment of the high-voltage system of this application. The high-voltage system also includes: Motor 300 is connected to motor control unit 101 in power domain module 10; The low-voltage control port 400 is connected to the motor control unit 101, the battery management system 102 and the on-board charger 103 in the power domain module 10. Charging port 500 is connected to on-board charger 103.

[0045] In this embodiment, the high-voltage system also includes a motor 300, which is connected to the motor control unit 101 in the power domain module 10, thereby controlling the motor 300 for driving based on the motor control unit 101; a low-voltage control port 400 is connected to the motor control unit 101, the battery management system 102, and the on-board charger 103 in the power domain module 10, thereby realizing high-voltage interlock detection of each component based on the low-voltage control port 400; it also includes a charging port 500, which is connected to the on-board charger 103 to charge the vehicle based on the on-board charger 103. For example, the motor control unit 101, the battery management system 102, the on-board charger 103, and the power battery 70 can also communicate with each other, which will not be described in detail here.

[0046] Based on the above embodiments of the high-voltage interlock detection circuit and high-voltage system, a vehicle is proposed, which includes the aforementioned high-voltage system.

[0047] In this embodiment, the above-mentioned vehicle (which can also be designed for other products, such as other drive equipment using high-voltage systems, depending on the actual situation) needs to perform high-voltage interlock detection on multiple high-voltage components in the high-voltage system. Therefore, the high-voltage interlock detection circuit in the high-voltage system is designed by setting the power domain module 10 on the circuit board 200 and using the copper-clad wires 201 of the circuit board 200 to replace the connection function of the low-voltage return line harness 30. This enables high-voltage interlock detection on the first high-voltage component 11 in the power domain module 10. At the same time, the low-voltage return line harness 30 is directly used to connect with the second high-voltage component 21 in the external high-voltage module 20 to achieve high-voltage interlock detection on the second high-voltage component 21. This eliminates the phenomenon that the low-voltage return line harness 30 needs to be connected in series with all high-voltage components to achieve high-voltage interlock detection. That is, by integrating multiple first high-voltage components 11 on the circuit board 200 through the power domain module 10 and connecting them with copper-clad wires 201 to achieve high-voltage interlock detection, the low-voltage return line harness 30 originally required for the first high-voltage component 11 can be reduced, thereby reducing the cost of the high-voltage interlock detection circuit. Furthermore, the entire high-voltage interlock detection circuit can ensure the accuracy of normal power supply for the entire high-voltage interlock detection circuit, while reducing the use of low-voltage return line harness 30 to reduce power protection costs.

[0048] The above are only some embodiments of this application and do not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A high-voltage interlock detection circuit, characterized in that, The high-voltage interlock detection circuit includes: A power domain module is mounted on a circuit board, wherein a first high-voltage device in the power domain module is connected in series with the first end of a high-voltage interlock detector in the power domain module via copper traces on the circuit board. An external high-voltage module is connected in series at the second end of the high-voltage interlock detector via a low-voltage return line harness. The high-voltage interlock detector is used to perform high-voltage interlock detection on the second high-voltage device and the first high-voltage device in the external high-voltage module.

2. The high-voltage interlock detection circuit as described in claim 1, characterized in that, The first end of the high-voltage interlock detector includes a first detection input end and a first detection output end. The power domain module includes a plurality of first high-voltage devices. Each first high-voltage device includes a first connector. Each first connector is connected in series through the copper-clad wire. The first terminal of the first connector of the first high-voltage device is connected to the first detection input terminal through the copper-clad wire, and the first connector of the last high-voltage device is connected to the first detection output terminal through the copper-clad wire. The first high-voltage device includes a battery management system, a motor control unit, and an on-board charger.

3. The high-voltage interlock detection circuit as described in claim 1, characterized in that, The second end of the high-voltage interlock detector includes a second detection input end and a second detection output end. The external high-voltage module includes a plurality of second high-voltage devices. Each second high-voltage device includes a second connector. Each second connector is connected in series through the low-voltage return line harness. The first end of the second connector of the first second high-voltage device is connected to the second detection input terminal through the low-voltage return line harness, and the second connector of the last second high-voltage device is connected to the second detection output terminal through the low-voltage return line harness. The second high-voltage device includes a thermal management component.

4. The high-voltage interlock detection circuit as described in claim 3, characterized in that, The second high-voltage device also includes a third connector, which is connected in series between the first detection input terminal and the first detection output terminal in the high-voltage interlock detector via the copper-clad wire.

5. The high-voltage interlock detection circuit as described in claim 1, characterized in that, The high-voltage interlock detection circuit includes: An interlock control switch is connected between the positive and negative terminals of the vehicle's power battery. An interlock control module is provided, wherein the first end of the interlock control module is connected to the control end of the interlock control switch, the second end of the interlock control module is connected to the detection output end of the high-voltage interlock detector, and the second end of the interlock control module is connected to the vehicle controller.

6. The high-voltage interlock detection circuit as described in claim 5, characterized in that, The interlock control module includes: The first AND gate device has its first input terminal serving as the second terminal of the interlock control module and connected to the detection output terminal of the high-voltage interlock detector. The second input terminal of the first AND gate device serves as the second terminal of the interlock control module and is connected to the vehicle controller. The output terminal of the first AND gate device serves as the first terminal of the interlock control module and is connected to the control terminal of the interlock control switch. Specifically, the first AND gate is configured such that when both its first and second input terminals are high, the interlock control switch is controlled to disconnect the connection between the positive and negative terminals of the power battery.

7. The high-voltage interlock detection circuit as described in claim 6, characterized in that, The vehicle controller includes a speed pedal output port and a power-off command output port, and the interlock control module further includes: A second AND gate device, wherein the first input terminal of the second AND gate device is connected to the speed pedal output port, the second input terminal of the second AND gate device is connected to the power-off command output port, and the output terminal of the second AND gate device is connected to the second input terminal of the first AND gate device; Specifically, when the second AND gate is configured such that either its first input or its second input is both at a high level, its output is at a high level.

8. A high-voltage system, characterized in that, The high-voltage system includes a high-voltage interlock detection circuit and a power battery as described in any one of claims 1 to 7; The positive and negative terminals of the power battery are connected in series with the first high-voltage device in the power domain module and the second high-voltage device in the external high-voltage module.

9. The high-voltage system as described in claim 8, characterized in that, The high-voltage system also includes: An electric motor, which is connected to a motor control unit in the power domain module; A low-voltage control port is connected to the motor control unit, battery management system, and on-board charger in the power domain module. A charging port, which is connected to the on-board charger.

10. A vehicle, characterized in that, The vehicle includes the high-voltage system according to any one of claims 8 to 9.

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