A detection circuit and a vehicle

Abstract

The application provides a detection circuit and a vehicle. The detection circuit comprises a controlled element and a control element. One end of the controlled element is connected with the control circuit, and the other end of the controlled element is grounded. One end of the control element is connected with the first end of a low-voltage detection connector, and the other end of the control element is connected with the second end of the low-voltage detection connector. The control element controls the on-off of the controlled element according to the connection state of the low-voltage detection connector, so that the controlled element outputs a corresponding detection signal to the control circuit. The control circuit determines the on-off state of the high-voltage interlocking loop and the connection state of the low-voltage detection connector based on the detection signal. The circuit can convert the connection state of the low-voltage detection connector into a high-low level detection signal recognizable by the control circuit, so as to accurately know the fault position and the on-off state of the high-voltage interlocking loop, and improve the detection and troubleshooting efficiency and the detection reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-voltage interlock detection, and more particularly, to a detection circuit and a vehicle. BACKGROUND

[0002] With the development of new energy vehicles, electric vehicles gradually become a trend. High-voltage electrical systems are usually configured in electric vehicles, which are used to supply power to high-power electrical equipment (such as motors) in the vehicle. In order to detect the working state of the high-voltage electrical system in real time, a high-voltage interlock (HVIL) system is usually provided in the vehicle. The high-voltage interlock system is provided with a plurality of high-voltage connectors and corresponding low-voltage detection connectors. Each high-voltage connector usually has an interlock contact. These contacts are connected by wires to form a complete high-voltage interlock loop. The high-voltage interlock system can cut off the high-voltage power supply in time when the high-voltage electrical system is abnormal, thereby preventing electric shock accidents and fire risks.

[0003] The related art high-voltage interlock system usually further provides a high-voltage interlock detection circuit and a control system. Once the high-voltage interlock detection circuit detects that the high-voltage interlock loop is disconnected, it will immediately send a signal to the control system to cut off the high-voltage output of all loads to ensure safety. However, the high-voltage interlock detection circuit in the related art cannot detect the specific position of the disconnection of the high-voltage interlock loop, resulting in low efficiency in troubleshooting the high-voltage interlock system. SUMMARY

[0004] The present application provides a detection circuit and a vehicle, which aims to solve the problem that the high-voltage interlock detection circuit cannot detect the specific position of the disconnection of the high-voltage interlock loop, resulting in low efficiency in troubleshooting the high-voltage interlock system.

[0005] In a first aspect, a detection circuit is provided, which is applied to a vehicle. The vehicle includes a high-voltage interlock loop having a low-voltage detection connector and a control circuit. The detection circuit includes a controlled element and a control element. One end of the controlled element is connected to the control circuit, and the other end of the controlled element is grounded. One end of the control element is connected to a first end of the low-voltage detection connector, and the other end of the control element is connected to a second end of the low-voltage detection connector. The control element is used to control the on-off of the controlled element according to the connection state of the low-voltage detection connector, so that the controlled element outputs a corresponding detection signal to the control circuit. The control circuit can determine the on-off state of the high-voltage interlock loop and the connection state of the low-voltage detection connector based on the detection signal.

[0006] In the technical solution, the control element can detect the connection state of the low-voltage detection connector in real time, and control the on-off state of the controlled element based on the detected real-time connection state of the low-voltage detection connector, so that the controlled element outputs a corresponding detection signal to the control circuit, thereby achieving accurate detection of the connection state of the low-voltage detection connector and the on-off state of the high-voltage interlocking loop. The detection circuit provided by the present application can convert the connection state of the low-voltage detection connector into a high-low level detection signal recognizable by the control circuit. The control circuit can accurately determine the fault position (i.e., the low-voltage detection connector with connection abnormalities) based on the detection signal, so that the worker can determine the low-voltage detection connector fault and quickly repair or replace the low-voltage detection connector, thereby improving the detection and troubleshooting efficiency, effectively solving the problem of low efficiency in troubleshooting the high-voltage interlocking system, and improving the safety. In addition, the detection circuit can realize autonomous detection through the control element and the controlled element, without relying on the control of the control circuit or other control circuits, and has high detection flexibility.

[0007] In some possible implementation manners, in combination with the first aspect and the foregoing implementation manners, the control element is a coil, one end of the coil is connected with the first end of the low-voltage detection connector, and the other end of the coil is connected with the second end of the low-voltage detection connector; and the controlled element is an armature switch, the armature switch is correspondingly arranged with the coil, a first end of the armature switch is connected with the control circuit, and the other end of the armature switch is grounded.

[0008] In the technical solution, the on-off state of the armature switch contact can be controlled by changing the current of the coil, that is, the on-off state of the contact is controlled by outputting different high-low levels of the current of the coil to output a corresponding high-low level detection signal, which has high flexibility. In addition, the coil circuit and the contact circuit of the armature switch in the relay composed of the coil and the armature switch are electrically isolated, that is, there is no direct electrical connection between the control circuit corresponding to the armature switch and the load circuit corresponding to the coil, which can effectively prevent damage to the circuit caused by high voltage or large current, thereby improving the service life and use reliability of the detection circuit.

[0009] In some possible implementation manners, in combination with the first aspect and the foregoing implementation manners, the control element is a light-emitting diode, the anode of the light-emitting diode is connected with the first end of the low-voltage detection connector, and the cathode of the light-emitting diode is connected with the second end of the low-voltage detection connector; and the controlled element is a triode, the triode is correspondingly arranged with the light-emitting diode, the collector of the triode is connected with the control circuit, and the emitter of the triode is grounded.

[0010] In the technical solution, the on-off of the triode can be controlled by changing the current of the light-emitting diode, that is, the on-off of the triode is controlled by the high and low levels of the current output of the light-emitting diode to output corresponding high and low level detection signals, which has high flexibility, fast response speed, and low power consumption because the light-emitting diode only needs a small current to drive light emission. In addition, the light-emitting diode circuit and the triode circuit in the optoelectronic coupler formed by the light-emitting diode and the triode are electrically isolated, that is, there is no direct electrical connection between the control circuit corresponding to the light-emitting diode and the load circuit corresponding to the triode, which can effectively prevent high voltage or large current from damaging the circuit, realize electrical isolation, and improve the service life and use reliability of the detection circuit.

[0011] In combination with the first aspect and the above implementation manners, in some possible implementation manners, the detection circuit further includes a first resistor and a filter capacitor; one end of the first resistor is connected with one end of the controlled element, and the other end of the first resistor is connected with the control circuit; and a first pole plate of the filter capacitor is connected with the one end of the first resistor and the one end of the controlled element, and a second pole plate of the filter capacitor is grounded.

[0012] In the technical solution, the RC filter formed by the first resistor and the filter capacitor can filter out high-frequency noise, reduce the interference components in the detection signal output by the controlled element, and improve the signal-to-noise ratio, reduce electromagnetic interference, and make the detection signal more easily received by the control circuit by removing noise through the first resistor and the filter capacitor. In addition, the first resistor and the filter capacitor can also smooth the detection signal, reduce the fluctuation and jitter of the detection signal, and make the detection signal accessed by the control circuit more stable. In this way, the first resistor and the filter capacitor arranged between the controlled element and the control circuit can filter out high-frequency noise in the detection signal, stabilize the detection signal, improve the signal-to-noise ratio, and reduce electromagnetic interference, thereby ensuring the detection reliability of the detection circuit and further ensuring the reliability of the detection signal received by the control circuit.

[0013] In combination with the first aspect and the above implementation manners, in some possible implementation manners, the detection circuit further includes: a pull-up resistor, one end of the pull-up resistor is connected with the first power supply voltage, and the other end of the pull-up resistor is connected with the first pole plate of the filter capacitor, the one end of the first resistor, and the one end of the controlled element.

[0014] In the technical solution, the pull-up resistor can ensure that the connection point of the control circuit is in a high level state without other driving signals (such as detection signals), so as to avoid the problem of false touch of the control circuit due to the uncertain state (such as high resistance state or floating state) of the connection point of the control circuit without the pull-up resistor. The pull-up resistor can pull the connection point to a high level to avoid false touch of the control circuit. In addition, the pull-up resistor can also improve the anti-interference ability of the detection circuit and reduce the influence of external noise on the detection circuit and the control circuit.

[0015] With reference to the first aspect and the above implementation manners, in some possible implementation manners, the number of low-voltage detection connectors is multiple, and the number of controlled elements and the number of control elements are multiple; the multiple control elements are in one-to-one correspondence with the controlled elements and the low-voltage detection connectors respectively, and the multiple control elements are connected in series.

[0016] In the technical solution, the multiple control elements can control the on-off of the corresponding controlled elements based on the connection state of the low-voltage detection connector connected thereto, so that the multiple controlled elements can output corresponding detection signals to the control circuit, and the control circuit can determine the connection state of the multiple low-voltage detection connectors and the on-off state of the corresponding high-voltage interlocking loop based on the different detection signals, thereby realizing accurate detection of the connection state of the multiple low-voltage detection connectors and the on-off state of the high-voltage interlocking loop. The control circuit can accurately know the fault position (i.e., the low-voltage detection connector with connection abnormality) based on the detection signals, further improving the detection and troubleshooting efficiency, effectively solving the problem of low efficiency in troubleshooting of the high-voltage interlocking system, and improving the safety to a certain extent.

[0017] With reference to the first aspect and the above implementation manners, in some possible implementation manners, the detection circuit further includes a second resistor, a first switch module, and a current source; one end of the second resistor is connected to the control circuit; a first end of the first switch module is connected to the other end of the second resistor, a second end of the first switch module is grounded, and a third end of the first switch module is connected to a first control element of the multiple control elements; one end of the current source is connected to a fourth end of the first switch module, and the other end of the current source is connected to a last control element of the multiple control elements.

[0018] In the technical solution, the control circuit can reduce the energy consumption of the detection circuit by controlling the first switch module to be turned off, thereby saving a certain amount of energy.

[0019] In some possible implementation manners, in combination with the first aspect and the foregoing implementation manners, the first switch module is an optoelectronic coupler; an anode of a light-emitting diode in the optoelectronic coupler is connected to the other end of the second resistor, a cathode of the light-emitting diode in the optoelectronic coupler is grounded, a collector of a transistor in the optoelectronic coupler is connected to the one end of the current source, and an emitter of the transistor in the optoelectronic coupler is connected to the first control element of the plurality of control elements.

[0020] In the foregoing technical solution, the control circuit can control the on-off of the transistor by changing the current of the light-emitting diode in the optoelectronic coupler, to achieve the control over the on-off of the first switch module, which is high in flexibility and fast in response speed, and the light-emitting diode only needs a small current to drive light emission, which is low in power consumption. In addition, the light-emitting diode circuit and the transistor circuit in the optoelectronic coupler are electrically isolated, that is, there is no direct electrical connection between the control circuit corresponding to the light-emitting diode and the load circuit corresponding to the transistor, which can effectively prevent the damage of high voltage or large current to the circuit, achieve electrical isolation, and improve the service life and use reliability of the detection circuit.

[0021] In some possible implementation manners, in combination with the first aspect and the foregoing implementation manners, the detection circuit further includes a third resistor and a second switch module; one end of the third resistor is connected to the second power supply voltage; the first end of the second switch module is connected to the other end of the third resistor, the second end of the second switch module is connected to the first control element of the plurality of control elements, and the controlled end of the second switch module is connected to the control circuit.

[0022] In the foregoing technical solution, the control circuit can control the on-off of the transistor by changing the current of the light-emitting diode in the optoelectronic coupler, to achieve the control over the on-off of the first switch module, which is high in flexibility and fast in response speed, and the light-emitting diode only needs a small current to drive light emission, which is low in power consumption. In addition, the light-emitting diode circuit and the transistor circuit in the optoelectronic coupler are electrically isolated, that is, there is no direct electrical connection between the control circuit corresponding to the light-emitting diode and the load circuit corresponding to the transistor, which can effectively prevent the damage of high voltage or large current to the circuit, achieve electrical isolation, and improve the service life and use reliability of the detection circuit.

[0023] In the foregoing technical solution, the control circuit can control the on-off of the transistor by changing the current of the light-emitting diode in the optoelectronic coupler, to achieve the control over the on-off of the first switch module, which is high in flexibility and fast in response speed, and the light-emitting diode only needs a small current to drive light emission, which is low in power consumption. In addition, the light-emitting diode circuit and the transistor circuit in the optoelectronic coupler are electrically isolated, that is, there is no direct electrical connection between the control circuit corresponding to the light-emitting diode and the load circuit corresponding to the transistor, which can effectively prevent the damage of high voltage or large current to the circuit, achieve electrical isolation, and improve the service life and use reliability of the detection circuit. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a module structure schematic diagram of a vehicle provided by the embodiment of the application;

[0025] Figure 2 is another module structure schematic diagram of a vehicle provided by the embodiment of the application;

[0026] Figure 3 is a circuit structure schematic diagram of a detection circuit provided by the embodiment of the application;

[0027] Figure 4 is another circuit structure schematic diagram of a detection circuit provided by the embodiment of the application;

[0028] Figure 5 is a circuit structure schematic diagram of still another detection circuit provided by an embodiment of the present application;

[0029] Figure 6 is a circuit structure schematic diagram of still another detection circuit provided by an embodiment of the present application;

[0030] Figure 7 is a circuit structure schematic diagram of still another detection circuit provided by an embodiment of the present application;

[0031] Figure 8 is a circuit structure schematic diagram of still another detection circuit provided by an embodiment of the present application.

[0032] In the drawings, various reference signs represent the following items:

[0033] 1, detection circuit; 11, controlled element; 12, control element; 13, second switch module; 14, first switch module; 2, low-voltage detection connector; 3, control circuit; R0, pull-up resistor; R1, first resistor; R2, second resistor; R3, third resistor; C, filter capacitor; VCC1, first power supply voltage; VCC2, second power supply voltage; CCS, current source. DETAILED DESCRIPTION

[0034] The technical solutions in the present application will be described clearly and exhaustively below with reference to the drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " represents the meaning of or, for example, A / B can represent A or B: the "and / or" in the text is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist together, and B exists alone, and in addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0035] Hereinafter, the terms "first", "second" are only for descriptive purposes, and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0036] At present, new energy vehicles instead of internal combustion engine vehicles are widely used in various scenes. Compared with internal combustion engine vehicles, new energy vehicles produce less noise during driving and do not directly emit exhaust gas, and have higher environmental protection. At the same time, new energy vehicles are more intelligent, have higher energy conversion efficiency, and have lower maintenance cost, so more and more people begin to use new energy vehicles as a means of transportation. New energy vehicles are usually configured with power batteries to provide power sources for vehicles and drive motors. For example, the power battery outputs direct current to the motor, and the motor controller (MCU) converts the direct current provided by the power battery into three-phase alternating current for driving the motor to run according to the target torque and speed sent by the vehicle control unit (VCU), so as to control the motor to complete functions such as starting, accelerating and decelerating, braking, energy recovery, etc., thereby ensuring the normal operation of the vehicle.

[0037] New energy vehicles are usually configured with two sets of electrical systems of high voltage and low voltage. Among them, the high voltage electrical system is provided with a high voltage battery (such as a power battery), and the high voltage battery is used to supply power to high-power electrical equipment (such as a motor) in the vehicle to drive the vehicle to keep normal driving. At the same time, the power battery will also charge the low voltage battery in the vehicle under the control of the vehicle control unit, and the charging voltage is usually about several hundred volts. In order to ensure the safety of the driver, passengers and the vehicle, a high voltage interlocking system is usually provided in the vehicle. The high voltage interlocking system includes a high voltage connector and a control system, and the high voltage connector is used to connect various components (such as high voltage battery, motor, inverter, etc.) in the high voltage electrical system to ensure the safe transmission of high voltage current. Each high voltage connector usually has an interlocking contact, and these contacts are connected in series by wires to form a complete high voltage interlocking loop. The high voltage interlocking loop and the control system can cut off the high voltage power supply in time when the high voltage electrical system is abnormal, thereby preventing electric shock accidents and fire risks.

[0038] The high-voltage connector can be loose, fall off, and the like. At this time, the high-voltage interlock loop is abnormal. In order to realize real-time monitoring of the connection state of the high-voltage interlock loop, the high-voltage interlock system in the related art usually further includes a high-voltage interlock detection circuit. The high-voltage interlock detection circuit includes a low-voltage detection connector and a low-voltage detection port. The low-voltage detection connector is used to connect the low-voltage detection port and the high-voltage interlock loop to ensure reliable transmission of signals. The low-voltage detection connector is usually distributed between each node in the high-voltage interlock loop. The low-voltage detection port is used to send and receive a low-voltage signal (for example, a 5V or 12V low-voltage signal) to detect the state of the high-voltage interlock loop. The detection principle is usually as follows: before the vehicle starts, the control system sends a low-voltage excitation signal through the low-voltage detection port. The excitation signal is transmitted through the low-voltage detection connector and the interlock contact of all high-voltage connectors in the high-voltage interlock loop. If all high-voltage connectors are correctly connected, the excitation signal will be successfully transmitted and returned to the low-voltage detection port through the low-voltage detection connector. If the low-voltage detection port receives a feedback signal matching the sent excitation signal, it indicates that all high-voltage connectors are correctly connected, and the high-voltage interlock loop is normal. At this time, the control system activates the high-voltage power supply, and the high-voltage electrical system starts to work. Once a high-voltage interlock loop fault is detected, the control system will take the same processing method, i.e., cutting off the high-voltage output of all loads.

[0039] However, the high-voltage interlock detection circuit in the related art can only detect whether the high-voltage interlock loop fails, and cannot accurately locate the specific position of the fault.

[0040] Therefore, the embodiments of the present application provide a detection circuit and a vehicle. The detection circuit can convert the connection state of the low-voltage detection connector into a high-low level detection signal recognizable by the control circuit, so that the control circuit can accurately know the fault position (i.e., the low-voltage detection connector with connection abnormality) and the on-off state of the corresponding high-voltage interlock loop based on the detection signal. The detection and troubleshooting efficiency is improved, the detection reliability is high, and the problem of low efficiency in troubleshooting the high-voltage interlock system fault is effectively solved.

[0041] The detection circuit and the vehicle provided by the embodiments of the present application will be described below with reference to the accompanying drawings.

[0042] The vehicle provided in the application comprises a high-voltage electrical system and a low-voltage electrical system, wherein the high-voltage electrical system is provided with a high-voltage battery (for example, a power battery), which is used to supply power to high-power electrical equipment (for example, a motor, an inverter, and other high-voltage components) in the vehicle to drive the vehicle to keep normal driving, and at the same time, the power battery also charges a low-voltage battery in the low-voltage electrical system under the control of a vehicle controller. The low-voltage electrical system is provided with a low-voltage battery (for example, a 12V storage battery) and a direct current converter (DCDC), which can convert high-voltage electricity of the high-voltage battery into low-voltage electricity to meet the transmission / control of signals in the vehicle, and details are not described herein.

[0043] In the high-voltage electrical system, the voltage is usually above several hundred volts, and when a person is repairing or checking the vehicle, the person may accidentally contact a high-voltage component that is not completely disconnected, resulting in an electric shock accident. In addition, short circuit or poor connection of the high-voltage electrical system may cause sparks or overheating, thereby causing a fire, which is a great safety hazard. Therefore, the vehicle provided in the application is provided with a high-voltage interlocking system, which comprises a high-voltage connector for connecting each component in the high-voltage electrical system to ensure safe transmission of high-voltage current. Each high-voltage connector usually has an interlocking contact, and these contacts are connected in series by wires to form a complete high-voltage interlocking loop. The high-voltage interlocking loop can ensure that the high-voltage power supply will not be activated when the high-voltage connector is not completely connected or disconnected, thereby preventing the person from contacting the live high-voltage component. At the same time, when the high-voltage electrical system is short-circuited or poorly connected, the high-voltage interlocking loop can quickly cut off the high-voltage power supply to prevent a fire caused by an electrical fault.

[0044] In order to realize fault detection of the high-voltage interlocking loop, in one example, as shown in Figure 1 the vehicle provided in the application further comprises a detection circuit 1, a low-voltage detection connector 2, and a control circuit 3. The low-voltage detection connector 2 is arranged in the high-voltage interlocking loop (not shown in the figure) and corresponds to the high-voltage connector (not shown in the figure). The detection circuit 1 is connected with the low-voltage detection connector 2, and the control circuit 3 is connected with the detection circuit 1. The control circuit 3 in the application can realize detection of the connection state of the low-voltage detection connector 2 based on the detection circuit 1, thereby realizing fault detection of the high-voltage interlocking loop.

[0045] In order to enable the detection circuit 1 to realize accurate detection of the connection state of the low-voltage detection connector 2, in one example, as shown in Figure 1As shown, the detection circuit 1 includes a controlled element 11 and a control element 12. One end of the controlled element 11 is connected to the control circuit 3, and the other end of the controlled element 11 is grounded. One end of the control element 12 is connected to the first end of the low-voltage detection connector 2, and the other end of the control element 12 is connected to the second end of the low-voltage detection connector 2. The control element 12 is used to control the on / off state of the controlled element 11 according to the connection state of the low-voltage detection connector 2, so that the controlled element 11 outputs a corresponding detection signal to the control circuit 3. The control circuit 3 can determine the on / off state of the high-voltage interlock circuit and the connection state of the low-voltage detection connector 2 based on the detection signal.

[0046] The connection status includes normal connection and abnormal connection. When the low-voltage detection connector 2 is normally connected, the high-voltage interlock circuit is connected, that is, the high-voltage interlock circuit is normal. Abnormal connection refers to situations such as the low-voltage detection connector 2 being loose or falling off. In this case, the low-voltage detection connector 2 is abnormally connected, which causes the high-voltage interlock circuit to be disconnected, that is, the high-voltage interlock circuit is abnormal.

[0047] In this example, control element 12 will detect the connection status of low-voltage detection connector 2 in real time to control the on / off state of controlled element 11 accordingly, so that controlled element 11 outputs a corresponding detection signal to control circuit 3. For example, when the low-voltage detection connector 2 corresponding to control element 12 is normally connected, control element 12 will not receive current. At this time, control element 12 controls controlled element 11 to turn off. It can be understood that when control element 12 does not receive current, control element 12 is not conducting, and controlled element 11 is not conducting, i.e., it is turned off. At this time, controlled element 11 will output a corresponding high-level detection signal to control circuit 3, so that control circuit 3 knows from the high-level detection signal that the low-voltage detection connector 2 is normally connected and the high-voltage interlock circuit remains connected, i.e., the high-voltage interlock circuit has not failed at this time. When the low-voltage detection connector 2 corresponding to control element 12 is abnormally connected, control element 12 will receive current. At this time, control element 12 controls controlled element 11 to conduct. In other words, when control element 12 receives current, it conducts, correspondingly controlling controlled element 11 to conduct. Controlled element 11 will then output a corresponding low-level detection signal to control circuit 3. Based on this low-level detection signal, control circuit 3 determines that the low-voltage detection connector 2 is abnormally connected, and the high-voltage interlock circuit is shut off. That is, control circuit 3 can determine that the high-voltage interlock circuit has failed based on this low-level detection signal. Once a fault is detected in the high-voltage interlock circuit and the fault location (i.e., the abnormally connected low-voltage detection connector 2) is determined, personnel can repair or replace the low-voltage detection connector 2 based on the fault location to efficiently troubleshoot the high-voltage interlock system.

[0048] It can be understood that the detection circuit 1 provided in the application can convert the connection state of the low-voltage detection connector 2 into a high-low level detection signal recognizable by the control circuit 3, so that the control circuit 3 can determine the connection state of the plurality of low-voltage detection connectors 2 and the on-off state of the corresponding high-voltage interlocking loop based on the high-low level detection signal.

[0049] Therefore, the control element 12 provided in the application can detect the connection state of the low-voltage detection connector 2 in real time, and control the on-off state of the controlled element 11 based on the real-time connection state of the low-voltage detection connector 2, so that the controlled element 11 outputs a corresponding detection signal to the control circuit 3, thereby achieving accurate detection of the connection state of the low-voltage detection connector 2 and the on-off state of the high-voltage interlocking loop. The detection circuit 1 provided in the application can convert the connection state of the low-voltage detection connector 2 into a high-low level detection signal recognizable by the control circuit 3, and the control circuit 3 can accurately determine the fault position (i.e., the low-voltage detection connector 2 with connection abnormalities) based on the detection signal, so that the worker can determine the fault of the low-voltage detection connector 2 and quickly repair or replace the low-voltage detection connector 2, thereby improving the detection and troubleshooting efficiency, effectively solving the problem of low efficiency in troubleshooting the high-voltage interlocking system, and improving the safety. Secondly, the detection circuit 1 can realize autonomous detection through the control element 12 and the controlled element 11, without relying on the control of the control circuit 3 or other control circuits, and has high detection flexibility.

[0050] Optionally, the detection circuit 1 provided in the application can be connected to the low-voltage detection connector 2 through a low-voltage detection port.

[0051] Optionally, the control circuit 3 provided in the application can be a microcontroller (Microcontroller Unit, MCU).

[0052] In one example, as shown in Figure 2 A plurality of low-voltage detection connectors 2 are arranged in the high-voltage interlocking loop, i.e., the number of low-voltage detection connectors 2 is a plurality, and correspondingly, the number of controlled elements 11 and control elements 12 is a plurality, and the plurality of control elements 12 correspond one-to-one to the controlled elements 11 and the low-voltage detection connectors 2. It can be understood that the number of the plurality of control elements 12 is the same as the number of the low-voltage detection connectors 2, and each low-voltage detection connector 2 is connected to one control element 12, and each control element 12 has one corresponding controlled element 11. For example, when the number of low-voltage detection connectors 2 is 4, the number of corresponding controlled elements 11 and control elements 12 is also 4 respectively. Figure 2 As shown in

[0053] In the example, each control element 12 can control the on-off of the corresponding controlled element 11 based on the connection state of the low-voltage detection connector 2 connected thereto, so that the controlled element 11 can output a corresponding detection signal to the control circuit 3, and the control circuit 3 can determine the on-off state of the high-voltage interlocking loop and the connection state of the plurality of low-voltage detection connectors 2 based on the plurality of detection signals, to realize accurate detection of the connection state of the plurality of low-voltage detection connectors 2 and the on-off state of the high-voltage interlocking loop.

[0054] For example, when the connection state of all low-voltage detection connectors 2 is normal connection, the plurality of control elements 12 will not receive current, at this time the control element 12 controls the corresponding controlled element 11 to be off, at this time the plurality of controlled elements 11 will output a corresponding high-level detection signal to the control circuit 3, so that the control circuit 3 can determine that the low-voltage detection connector 2 is normally connected based on the high-level detection signal from the plurality of controlled elements 11, and the high-voltage interlocking loop remains connected, that is, the high-voltage interlocking loop does not fail at this time. When the connection state of one of the low-voltage detection connectors 2 is abnormal connection, and the connection state of the remaining low-voltage detection connectors 2 is normal connection, the control element 12 corresponding to one of the low-voltage detection connectors 2 will receive current, at this time the control element 12 controls the corresponding controlled element 11 to be on, so that the controlled element 11 outputs a corresponding low-level detection signal to the control circuit 3, and the control elements 12 corresponding to the remaining low-voltage detection connectors 2 will not receive current, so that the corresponding controlled elements 11 output high-level detection signals to the control circuit 3, and the control circuit 3 can determine that the low-voltage detection connector 2 corresponding to the low-level detection signal is abnormally connected based on the low-level detection signal, and that the low-voltage detection connector 2 corresponding to the high-level detection signal is normally connected based on the high-level detection signal. It can be understood that if any one of the plurality of low-voltage detection connectors 2 is abnormally connected, the high-voltage interlocking loop is off, that is, at this time the control circuit 3 can determine that the high-voltage interlocking loop fails based on the low-level detection signal. After detecting that the high-voltage interlocking loop fails and determining the fault position (i.e. the low-voltage detection connector 2 with abnormal connection), the worker can repair or replace the low-voltage detection connector 2 based on the fault position to efficiently eliminate the high-voltage interlocking system failure.

[0055] It is worth noting that the number of low-voltage detection connectors can be equal to or less than the number of high-voltage connectors. When the number of low-voltage detection connectors is equal to the number of high-voltage connectors, the high-voltage connector and the low-voltage detection connector are one-to-one corresponding, to ensure that the state of each high-voltage connector can be independently detected, thereby improving the safety of the system; when the number of low-voltage detection connectors is less than the number of high-voltage connectors, a plurality of high-voltage connectors can be connected to the same low-voltage detection connector to save manufacturing costs. The actual needs can be set, and the present application does not make specific limitations.

[0056] In this way, multiple control elements 12 can control the on / off state of the corresponding controlled elements 11 based on the connection status of the low-voltage detection connectors 2 connected to them, so that multiple controlled elements 11 can output corresponding detection signals to the control circuit 3. The control circuit 3 can determine the connection status of multiple low-voltage detection connectors 2 and the on / off state of the corresponding high-voltage interlock circuit based on different detection signals, realizing accurate detection of the connection status of multiple low-voltage detection connectors 2 and the on / off state of the high-voltage interlock circuit. Moreover, the control circuit 3 can accurately know the fault location (i.e., the abnormally connected low-voltage detection connector 2) based on the detection signals, further improving the detection and troubleshooting efficiency, effectively solving the problem of low efficiency in troubleshooting high-voltage interlock systems, and improving a certain degree of safety.

[0057] In one example, such as Figure 3 As shown, the control element 12 is a coil, one end of which is connected to the first end of the low-voltage detection connector 2, and the other end of which is connected to the second end of the low-voltage detection connector 2. The controlled element 11 is an armature switch, which is set to correspond to the coil. The first end of the armature switch is connected to the control circuit 3, and the other end of the armature switch is grounded. At this time, the controlled element 11 and the control element 12 together constitute a relay.

[0058] The armature switch has normally open contacts. When the low-voltage detection connector 2 corresponding to the coil is properly connected, the coil will not receive current and is not conducting. Therefore, the normally open contact of the armature switch is open, meaning the armature switch is off. The armature switch will output a corresponding high-level detection signal to the control circuit 3, allowing the control circuit 3 to determine that the low-voltage detection connector 2 is properly connected. When the low-voltage detection connector 2 corresponding to the coil is abnormally connected, the coil will receive current and conduct. Therefore, the normally open contact of the armature switch is closed, meaning the armature switch is on. The armature switch will output a corresponding low-level detection signal to the control circuit 3, allowing the control circuit 3 to determine that the low-voltage detection connector 2 is abnormally connected.

[0059] It is worth noting that when there are multiple low-voltage detection connectors 2, each low-voltage detection connector 2 is connected to a corresponding coil, and each coil is equipped with a corresponding armature switch. The other ends of the multiple armature switches are connected to each other to ground.

[0060] In this example, the on-off of the armature switch contact can be controlled by changing the current of the coil, that is, the on-off of the contact is controlled by the high and low level output of the current of the coil to output the corresponding high and low level detection signal, which has high flexibility, and the coil only needs a small current to drive, and the power consumption is low. Secondly, the coil and the armature switch constitute a relay, and the coil circuit and the contact circuit of the armature switch are electrically isolated, that is, there is no direct electrical connection between the control circuit corresponding to the armature switch and the load circuit corresponding to the coil, which can effectively prevent high voltage or large current from damaging the circuit, realize electrical isolation, and improve the service life and use reliability of the detection circuit 1.

[0061] In one example, as shown in FIG. 1, the control element 12 is a light emitting diode (LED), the anode of the light emitting diode is connected with the first end of the low-voltage detection connector 2, the cathode of the light emitting diode is connected with the second end of the low-voltage detection connector 2, and the controlled element 11 is a triode, which is arranged correspondingly with the light emitting diode, the collector of the triode is connected with the control circuit 3, and the emitter of the triode is grounded. At this time, the controlled element 11 and the control element 12 together constitute an optoelectronic coupler. Figure 4

[0062] It is worth noting that when the number of low-voltage detection connectors 2 is multiple, each low-voltage detection connector 2 is connected with a corresponding light emitting diode, and each light emitting diode is provided with a corresponding triode, wherein the emitters of the multiple triodes are connected with each other to be grounded.

[0063] In this example, when the low-voltage detection connector 2 corresponding to the light emitting diode is normally connected, the light emitting diode will not receive current, and the light emitting diode will not be turned on. At this time, the light emitting diode does not emit light, and the triode is turned off, and the triode will output the corresponding high level detection signal to the control circuit 3, so that the control circuit 3 knows that the low-voltage detection connector 2 is normally connected based on the signal. When the low-voltage detection connector 2 corresponding to the light emitting diode is connected abnormally, the light emitting diode will receive current, and the light emitting diode will be turned on. At this time, the light emitting diode emits light, and the triode is turned on, and the triode will output the corresponding low level detection signal to the control circuit 3, so that the control circuit 3 knows that the low-voltage detection connector 2 is connected abnormally based on the signal.

[0064] ​In this example, the on-off of the transistor can be controlled by changing the current of the light-emitting diode, that is, the on-off of the transistor is controlled by the high and low levels of the current output of the light-emitting diode to output corresponding high and low level detection signals, which has high flexibility, fast response speed, and the light-emitting diode only needs a small current to drive light emission, which has low power consumption. Secondly, the light-emitting diode circuit and the transistor circuit in the optoelectronic coupler formed by the light-emitting diode and the transistor are electrically isolated, that is, there is no direct electrical connection between the control circuit corresponding to the light-emitting diode and the load circuit corresponding to the transistor, which can effectively prevent high voltage or large current from damaging the circuit, realize electrical isolation, and improve the service life and use reliability of the detection circuit.

[0065] In order to improve the reliability of the detection signal output by the controlled element 11, in one example, as shown in Figure 5 the detection circuit 1 further includes a first resistor R1 and a filter capacitor C, one end of the first resistor R1 is connected with one end of the controlled element 11, the other end of the first resistor R1 is connected with the control circuit 3, the first plate of the filter capacitor C is connected with one end of the first resistor R1 and one end of the controlled element 11, and the second plate of the filter capacitor C is grounded.

[0066] In this example, the RC filter composed of the first resistor R1 and the filter capacitor C can filter out high-frequency noise, reduce the interference components in the detection signal output by the controlled element 11, and by removing noise through the first resistor R1 and the filter capacitor C, the signal-to-noise ratio can be improved, electromagnetic interference can be reduced, and the detection signal can be more easily received by the control circuit 3. Secondly, the first resistor R1 and the filter capacitor C can also smooth the detection signal, reduce the fluctuation and jitter of the detection signal, and make the detection signal accessed by the control circuit 3 more stable. In this way, by arranging the first resistor R1 and the filter capacitor C between the controlled element 11 and the control circuit 3, the high-frequency noise in the detection signal can be filtered out, the detection signal can be stabilized, the signal-to-noise ratio can be improved, and the electromagnetic interference can be reduced, thereby ensuring the detection reliability of the detection circuit 1 and further ensuring the reliability of the detection signal received by the control circuit 3.

[0067] It is worth noting that when the number of low-voltage detection connectors 2 is multiple, the first resistor R1 and the filter capacitor C are arranged in each detection branch corresponding to each low-voltage detection connector 2, and the second plates of the multiple filter capacitors C are connected with each other to be grounded.

[0068] In one example, as shown in Figure 5 the detection circuit 1 further includes a pull-up resistor R0, one end of the pull-up resistor R0 is connected with the first power supply voltage VCC1, and the other end of the pull-up resistor R0 is connected with the first plate of the filter capacitor C, one end of the first resistor R1, and one end of the controlled element 11.

[0069] In this example, the pull-up resistor R0 can ensure that the connection point of the control circuit 3 is in a high level state without other driving signals (such as detection signals), avoiding the problem of false triggering of the control circuit 3 when the pull-up resistor R0 is not set, and pulling these connection points to a high level through the pull-up resistor R0 to avoid false triggering of the control circuit 3. Secondly, the pull-up resistor R0 can also improve the anti-interference ability of the detection circuit 1 and reduce the influence of external noise on the detection circuit 1 and the control circuit 3.

[0070] It is worth noting that when the number of low-voltage detection connectors 2 is multiple, each low-voltage detection connector 2 is provided with a pull-up resistor R0 corresponding to the detection branch, and one end of the multiple pull-up resistors R0 is connected to each other to access the first power supply voltage VCC1.

[0071] The specific implementation scheme of the high-voltage interlocking loop can be classified as voltage source type and current source type according to the circuit excitation source. For example, please refer to Figures 1 to 5 The high-voltage interlocking loop adopts the voltage source type, and the control element 12 and the low-voltage detection connector 2 access the second power supply voltage VCC2. In order to reduce the energy consumption of the detection circuit 1, in one example, as shown in Figure 6 , the detection circuit 1 further comprises a third resistor R3 and a second switch module 13. One end of the third resistor R3 accesses the second power supply voltage VCC2. The first end of the second switch module 13 is connected to the other end of the third resistor R3. The second end of the second switch module 13 is connected to the first control element 12 of the multiple control elements 12. The controlled end of the second switch module 13 is connected to the control circuit 3.

[0072] Here, it is worth noting that, as shown in Figure 6 , the multiple control elements 12 are connected in series. The control element 12 at the first end is the first control element 12 of the multiple control elements 12. The control element 12 at the end and connected to the ground is the last control element 12 of the multiple control elements 12.

[0073] In this example, when the detection circuit 1 needs to be detected, the control circuit 3 controls the second switch module 13 to be turned on, so that the second power supply voltage VCC2 is loaded into the loop where the low-voltage detection connector 2 is located, so that the low-voltage detection connector 2 and the detection circuit 1 can operate normally. When the detection circuit 1 does not need to be detected, the control circuit 3 controls the second switch module 13 to be turned off, so that the second power supply voltage VCC2 will not be loaded into the loop where the low-voltage detection connector 2 is located. At this time, the low-voltage detection connector 2 and the detection circuit 1 do not work. In this way, the control circuit 3 can reduce the energy consumption of the detection circuit 1 by controlling the second switch module 13 to be turned off, thereby saving a certain amount of energy.

[0074] Optionally, the second switch module 13 can be a switch, an N-type metal oxide semiconductor (NMOS) field effect transistor, a P-type metal oxide semiconductor (PMOS) field effect transistor, an IGBT, a triode, a relay circuit, or other devices or circuits capable of realizing on-off action, and the present application does not make specific limitations thereto.

[0075] Optionally, as shown in Figure 7 the second switch module 13 can be a PNP triode, the emitter of the PNP triode is connected to the other end of the third resistor R3, the base of the PNP triode is connected to the control circuit 3, and the collector of the PNP triode is connected to the first control element 12 of the plurality of control elements 12. In the on state, the PNP triode has a low saturation voltage drop, which helps to reduce the power loss and heat of the second switch module 13. The second switch module 13 can also be selected from other switches, and the present application does not make specific limitations thereto.

[0076] In this example, one end of the plurality of pull-up resistors R0 is connected to each other to access the first power supply voltage VCC1, the second switch module 13 and the control element 12 access the second power supply voltage VCC2, and the first power supply voltage VCC1 and the second power supply voltage VCC2 are used to provide independent power supply for different circuit components (i.e. pull-up resistors R0, second switch module 13 and control element 12), reducing interference between each other. Moreover, by using independent power supply, the voltage input to different components can be better controlled and adjusted, improving the stability of the entire detection circuit 1. Secondly, even if one of the power supplies (the first power supply providing the first power supply voltage VCC1 or the second power supply providing the second power supply voltage VCC2) fails, the other power supply can still continue to supply power to other components, improving the operation reliability of the detection circuit 1. The number of power supplies can be set according to actual needs, and the present application does not make specific limitations thereto.

[0077] For example, please refer to Figure 8 , the high-voltage interlocking loop adopts a current source type, and the detection circuit 1 further comprises a second resistor R2, a first switch module 14 and a current source CCS, one end of the second resistor R2 is connected to the control circuit 3, the first end of the first switch module 14 is connected to the other end of the second resistor R2, the second end of the first switch module 14 is grounded, the third end of the first switch module 14 is connected to the first control element 12 of the plurality of control elements 12, one end of the current source CCS is connected to the fourth end of the first switch module 14, and the other end of the current source CCS is connected to the last control element 12 of the plurality of control elements 12.

[0078] In the example, when the detection circuit 1 needs to be detected, the control circuit 3 controls the first switch module 14 to be turned on, and a loop formed between the first switch module 14 and the ground is turned on, so that the current source CCS is loaded into the loop in which the low-voltage detection connector 2 is located, and the low-voltage detection connector 2 and the detection circuit 1 can normally operate. When the detection circuit 1 does not need to be detected, the control circuit 3 controls the first switch module 14 to be turned off, so that the current source CCS is not loaded into the loop in which the low-voltage detection connector 2 is located, and the low-voltage detection connector 2 and the detection circuit 1 do not work. In this way, the control circuit 3 can reduce the energy consumption of the detection circuit 1 by controlling the first switch module 14 to be turned off, thereby saving a certain amount of energy.

[0079] Optionally, as shown in Figure 8 The first switch module 14 can be an optoelectronic coupler, the anode of a light-emitting diode in the optoelectronic coupler is connected to the other end of the second resistor R2, the cathode of the light-emitting diode in the optoelectronic coupler is grounded, the collector of a transistor in the optoelectronic coupler is connected to the current source CCS, and the emitter of the transistor in the optoelectronic coupler is connected to the first control element 12 of the plurality of control elements 12. The control circuit 3 can control the on-off of the transistor by changing the current of the light-emitting diode in the optoelectronic coupler, so as to control the on-off of the first switch module 14, which has high flexibility, fast response speed, and low power consumption because the light-emitting diode only needs a small current to drive light emission. In addition, the light-emitting diode circuit and the transistor circuit in the optoelectronic coupler are electrically isolated, i.e., there is no direct electrical connection between the control circuit corresponding to the light-emitting diode and the load circuit corresponding to the transistor, which can effectively prevent high voltage or large current from damaging the circuit, achieve electrical isolation, and improve the service life and use reliability of the detection circuit 1. The first switch module 14 can also be selected from other circuits or devices that can achieve isolation and switching functions, and the present application does not make specific limitations in this regard.

[0080] In conclusion, the control element 12 can detect the connection state of the low-voltage detection connector 2 in real time, and control the on-off of the controlled element 11 based on the detected real-time connection state of the low-voltage detection connector 2, so that the controlled element 11 outputs the corresponding detection signal to the control circuit 3, realizing accurate detection of the connection state of the low-voltage detection connector 2 and the on-off state of the high-voltage interlocking loop. The detection circuit 1 provided by the present application can convert the connection state of the low-voltage detection connector 2 into a high-low level detection signal recognizable by the control circuit 3, and the control circuit 3 can accurately know the fault position (i.e. the low-voltage detection connector 2 with connection abnormalities) based on the detection signal, so that the worker can determine the fault of the low-voltage detection connector 2, and quickly repair or replace the low-voltage detection connector 2, improve the detection and troubleshooting efficiency, effectively solve the problem of low efficiency in troubleshooting the high-voltage interlocking system, and improve the safety. Secondly, through the control element 12 and the controlled element 11, the detection circuit 1 can realize autonomous detection without relying on the control of the control circuit 3 or other control circuits, and has high detection flexibility.

[0081] The vehicle of the embodiment of the present application can be an electric vehicle, i.e., a vehicle that uses electric energy as a power source and drives wheels through an electric motor. The electric vehicle includes, but is not limited to, a battery electric vehicle (BEV), a plug-in hybrid electric vehicle (PHEV), a hybrid electric vehicle (HEV), an extended-range electric vehicle (EREV), etc. Among them, the battery electric vehicle completely relies on the electric energy stored in the battery to drive the electric motor to realize the power output of the vehicle. The plug-in hybrid electric vehicle combines an electric motor and an internal combustion engine. The electric motor can drive the vehicle alone or work together with the internal combustion engine, and the battery can be charged by an external power source. The hybrid electric vehicle is equipped with an electric motor and an internal combustion engine. The electric motor assists the internal combustion engine, but cannot drive the vehicle alone. The extended-range electric vehicle mainly relies on the electric motor for driving, and the internal combustion engine serves as a generator to charge the battery, and does not directly drive the wheels.

[0082] The vehicle provided by the embodiment of the present application has the detection circuit 1 and the control circuit 3 of the above-mentioned embodiment, and has all the beneficial effects of the detection circuit 1 and the control circuit 3. Therefore, the above-mentioned beneficial effects will not be described again.

[0083] Through the description of the above embodiments, those skilled in the art can understand that, for the convenience and brevity of description, only the division of the above functional modules is exemplified, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0084] In the embodiments provided in the present application, it should be understood that the disclosed device and method can be implemented in other ways. For example, the device embodiments described above are only illustrative, for example, the division of the modules or units is only a logical function division, and in actual implementation, there can be another division manner, for example, a plurality of units or components can be combined or integrated into another device, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed ones can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0085] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A detection circuit applied to a vehicle, the vehicle comprising a high-voltage interlock loop having a low-voltage detection connector and a control circuit, characterized in that, The detection circuit comprises: a controlled element, one end of the controlled element being connected with the control circuit, and the other end of the controlled element being grounded; and a control element, one end of the control element being connected with the first end of the low-voltage detection connector, and the other end of the control element being connected with the second end of the low-voltage detection connector, the control element being used for controlling the on-off of the controlled element according to the connection state of the low-voltage detection connector, so that the controlled element outputs a corresponding detection signal to the control circuit, the control circuit being capable of determining the on-off state of the high-voltage interlocking loop and the connection state of the low-voltage detection connector based on the detection signal, the control element being electrically isolated from the controlled element, and the loop in which the control element is located being not directly electrically connected with the loop in which the controlled element is located; wherein the number of the low-voltage detection connectors is multiple, and the number of the controlled elements and the number of the control elements are respectively multiple; the multiple control elements correspond to the controlled elements and the low-voltage detection connectors one by one, and the multiple control elements are connected in series.

2. The detection circuit of claim 1, wherein, The control element is a coil, one end of the coil being connected with the first end of the low-voltage detection connector, and the other end of the coil being connected with the second end of the low-voltage detection connector; the controlled element is an armature switch, the armature switch being correspondingly arranged with the coil, the first end of the armature switch being connected with the control circuit, and the other end of the armature switch being grounded.

3. The detection circuit of claim 1, wherein, The control element is a light-emitting diode, the anode of the light-emitting diode being connected with the first end of the low-voltage detection connector, and the cathode of the light-emitting diode being connected with the second end of the low-voltage detection connector; the controlled element is a triode, the triode being correspondingly arranged with the light-emitting diode, the collector of the triode being connected with the control circuit, and the emitter of the triode being grounded.

4. The detection circuit of claim 1, wherein, The detection circuit further comprises: a first resistor, one end of the first resistor being connected with one end of the controlled element, and the other end of the first resistor being connected with the control circuit; and a filter capacitor, the first pole plate of the filter capacitor being connected with one end of the first resistor and one end of the controlled element, and the second pole plate of the filter capacitor being grounded.

5. The detection circuit of claim 4, wherein, The detection circuit further comprises: a pull-up resistor, one end of the pull-up resistor being connected with a first power supply voltage, and the other end of the pull-up resistor being connected with the first pole plate of the filter capacitor, one end of the first resistor, and one end of the controlled element.

6. The detection circuit according to any one of claims 1 to 5, characterized in that, The detection circuit further comprises: a second resistor, one end of the second resistor being connected with the control circuit; a first switch module, the first end of the first switch module being connected with the other end of the second resistor, the second end of the first switch module being grounded, and the third end of the first switch module being connected with a first control element of the multiple control elements; and a current source, one end of the current source being connected with the fourth end of the first switch module, and the other end of the current source being connected with a last control element of the multiple control elements.

7. The detection circuit of claim 6, wherein, The first switch module is an optoelectronic coupler. An anode of the light emitting diode in the optoelectronic coupler is connected to the other end of the second resistor, a cathode of the light emitting diode in the optoelectronic coupler is grounded, a collector of the transistor in the optoelectronic coupler is connected to one end of the current source, and an emitter of the transistor in the optoelectronic coupler is connected to a first control element of the plurality of control elements.

8. The detection circuit of claim 7, wherein, The detection circuit further comprises: a third resistor, one end of the third resistor being connected to a second power supply voltage; and a second switch module, a first end of the second switch module being connected to the other end of the third resistor, a second end of the second switch module being connected to a first control element of the plurality of control elements, and a controlled end of the second switch module being connected to the control circuit.

9. A vehicle characterized by comprising: The vehicle comprises: a high-voltage interlock loop, the high-voltage interlock loop being provided with a low-voltage detection connector; the detection circuit according to any one of claims 1 to 8, the detection circuit being connected to the low-voltage detection connector; and a control circuit, the control circuit being connected to the detection circuit.

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