High-voltage interlocking detection system and vehicle

Abstract

The utility model provides a high-voltage interlocking detection system and a vehicle, the high-voltage interlocking detection system is applied to a high-voltage interlocking loop with a low-voltage detection connector, and the high-voltage interlocking detection system comprises a voltage sampling module, a voltage comparison module and a controller; the voltage sampling module is connected with the low-voltage detection connector and is used for acquiring sampling voltage; a first input end of the voltage comparison module is connected with a reference voltage, a second input end of the voltage comparison module is connected with an output end of the voltage sampling module and is used for connecting the sampling voltage, and the voltage comparison module is used for generating a comparison signal based on the reference voltage and the sampling voltage; the controller is connected with the output end of the voltage comparison module. The controller is used for determining the working state of the low-voltage detection connector based on the comparison signal. According to the invention, the problem of low efficiency of eliminating the fault of the high-voltage interlocking system can be solved.

Description

Technical Field

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

[0002] To enable real-time monitoring of the connection status of high-voltage circuits during vehicle charging and discharging, identify abnormal disconnections or damage to high-voltage circuits, and promptly disconnect high-voltage power to ensure safety, a high-voltage interlock system has been proposed in related technologies. The high-voltage interlock system comprises a high-voltage interlock circuit consisting of electronic components such as low-voltage detection connectors and low-voltage detection circuitry.

[0003] When the electronic components of the high-voltage interlock circuit malfunction due to wear, aging, or other reasons, the high-voltage interlock circuit will disconnect. Simultaneously, a fault alarm will sound in the high-voltage interlock system, and the high-voltage circuit will be disconnected. This ensures timely disconnection of the high-voltage power supply, preventing electric shock or fire accidents and protecting the safety of personnel and vehicles.

[0004] Currently, when a fault alarm occurs in a high-voltage interlock system, it is difficult to accurately determine the specific location where the high-voltage interlock circuit is disconnected, resulting in low efficiency in troubleshooting high-voltage interlock system faults. Utility Model Content

[0005] This application provides a high-voltage interlock detection system and vehicle, which can solve the problem of low efficiency in troubleshooting high-voltage interlock systems.

[0006] In a first aspect, this application provides a high-voltage interlock detection system, applied to a high-voltage interlock circuit with a low-voltage detection connector, comprising:

[0007] A voltage sampling module, which is connected to the low-voltage detection connector, is used to acquire the sampled voltage;

[0008] A voltage comparison module, wherein a first input terminal of the voltage comparison module is connected to a reference voltage, and a second input terminal of the voltage comparison module is connected to the output terminal of the voltage sampling module for receiving the sampled voltage; the voltage comparison module is used to generate a comparison signal based on the reference voltage and the sampled voltage; and...

[0009] A controller is connected to the output terminal of the voltage comparison module, and the controller is used to determine the working state of the low-voltage detection connector based on the comparison signal.

[0010] In this embodiment, the sampling voltage obtained by the voltage sampling module differs depending on whether the low-voltage detection connector is properly connected or not. The voltage comparison module compares the sampled voltage with a reference voltage to generate a comparison signal indicating whether the low-voltage detection connector is properly connected. The controller can then determine the connection status based on this comparison signal. When a fault alarm occurs in the high-voltage interlock system, if the controller receives a comparison signal indicating an abnormal connection of a particular low-voltage detection connector, personnel can accurately identify the faulty connector and quickly repair or replace it, efficiently eliminating the high-voltage interlock system fault. Therefore, this application effectively solves the problem of low efficiency in troubleshooting high-voltage interlock systems.

[0011] In conjunction with the first aspect, in some possible implementations, the voltage sampling module includes:

[0012] The first voltage divider circuit includes multiple voltage divider resistors connected in series; one end of one of the voltage divider resistors is connected to the first end of the low-voltage detection connector and the second input end of the voltage comparison module, and the other end is connected to the second end of the low-voltage detection connector.

[0013] In combination with the first aspect and the above implementation, in some possible implementations, the first voltage divider circuit includes a first voltage divider resistor, a second voltage divider resistor, and a third voltage divider resistor connected in series;

[0014] One end of the first voltage divider resistor is connected to the operating voltage;

[0015] One end of the second voltage divider resistor is connected to the other end of the first voltage divider resistor, the first end of the low-voltage detection connector, and the second input terminal of the voltage comparison module; the other end of the second voltage divider resistor is connected to one end of the third voltage divider resistor and the second end of the low-voltage detection connector.

[0016] The other end of the third voltage divider resistor is grounded.

[0017] In combination with the first aspect and the above implementation methods, in some possible implementations, the voltage comparison module includes:

[0018] At least one voltage comparator, wherein the inverting input of the voltage comparator is connected to the output of the voltage sampling module, the non-inverting input of the voltage comparator is connected to the reference voltage, and the output of the voltage comparator is connected to the controller;

[0019] The reference voltage connected to the non-inverting input terminal of different voltage comparators is different.

[0020] In conjunction with the first aspect and the above-described implementation methods, in some possible implementations, the high-voltage interlock detection system further includes:

[0021] A reference voltage module, the reference voltage module including at least one second voltage divider circuit, the second voltage divider circuit being connected to the voltage comparator one-to-one, the second voltage divider circuit being used to output the reference voltage to the voltage comparator;

[0022] The reference voltage output by different second voltage divider circuits is different.

[0023] Combining the first aspect and the above implementation methods, in some possible implementations, the number of voltage comparators is three;

[0024] The number of the second voltage divider circuits is three, and each second voltage divider circuit includes a fourth voltage divider resistor and a fifth voltage divider resistor connected in series; wherein, the non-inverting input terminal of each voltage comparator is connected between the fourth voltage divider resistor and the fifth voltage divider resistor of one of the second voltage divider circuits.

[0025] In combination with the first aspect and the above implementation methods, in some possible implementations, the number of the voltage comparator and the second voltage divider circuit is multiple; the high-voltage interlock detection system further includes:

[0026] A signal processing module is disposed adjacent to a plurality of the voltage comparators; the signal processing module is connected to the output terminals of the plurality of voltage comparators and the controller.

[0027] In conjunction with the first aspect and the above-described implementation methods, in some possible implementations, the high-voltage interlock detection system further includes:

[0028] A switching module is connected in series with the voltage divider resistor, and the controlled terminal of the switching module is connected to the controller.

[0029] In conjunction with the first aspect and the above-described implementation methods, in some possible implementations, the high-voltage interlock detection system further includes:

[0030] An isolation module, wherein the first end of the isolation module is connected to the control end of the controller, and the second end of the isolation module is connected to the controlled end of the switch module.

[0031] Secondly, this application also provides a vehicle, including:

[0032] The high-voltage interlock detection system described in any of the first aspects above.

[0033] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0034] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the embodiments described below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0035] Figure 1 This is a schematic diagram of the framework of a high-voltage interlock detection system provided in an embodiment of this application;

[0036] Figure 2 yes Figure 1 A schematic diagram of the first type of circuit for a high-voltage interlock detection system;

[0037] Figure 3 yes Figure 1 A schematic diagram of the second type of circuit for a high-voltage interlock detection system;

[0038] Figure 4 yes Figure 1 A schematic diagram of the third type of circuit for a high-voltage interlock detection system;

[0039] Figure 5 yes Figure 1 The fourth circuit diagram of the high-voltage interlock detection system.

[0040] The annotations in the attached figures are explained as follows:

[0041] 1—High-voltage interlock detection system;

[0042] 100—Voltage sampling module; 110—First voltage divider circuit; R1—First voltage divider resistor; R2—Second voltage divider resistor; R3—Third voltage divider resistor; Vs—Sampling voltage;

[0043] 200—Voltage comparator module; Com—Voltage comparator; Vc, Vc1, Vc2, Vc3—Comparison signals;

[0044] 300—Controller;

[0045] 400—Reference voltage module; 410—Second voltage divider circuit; R4, R41, R42, R43—Fourth voltage divider resistors; R5, R51, R52, R53—Fifth voltage divider resistors; Vr, Vr1, Vr2, Vr3—Reference voltage;

[0046] 500—Signal Processing Module;

[0047] 600—Switch Module;

[0048] 700—Isolation Module;

[0049] 2—Low-voltage detection connector. Detailed Implementation

[0050] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0052] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0053] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0054] High-voltage connectors are essential components for connecting high-voltage power supplies and high-voltage electrical equipment, and are widely used in vehicles and high-voltage charging facilities. For example, high-voltage connectors form a high-voltage circuit with the power battery and high-voltage components (such as electric motors) in the vehicle system, enabling the efficient delivery of high-voltage electrical energy from the power battery to these components.

[0055] To enable real-time monitoring of the connection status of high-voltage circuits during vehicle charging and discharging, identify abnormal disconnections or damage to high-voltage circuits, and promptly disconnect high-voltage power to ensure safety, a high-voltage interlock system has been proposed in related technologies. The high-voltage interlock system comprises a high-voltage interlock circuit consisting of electrical equipment such as low-voltage detection connectors and low-voltage detection lines.

[0056] The low-voltage detection connector is typically integrated within the high-voltage connector. In other words, the high-voltage connector includes both high-voltage terminals and the low-voltage detection connector. During the use of the high-voltage connector, if both the high-voltage terminals and the low-voltage detection connector are correctly inserted or removed, the high-voltage interlock circuit and the high-voltage circuit will be connected or disconnected sequentially, thus preventing the high-voltage connector from being inserted or removed while energized and effectively avoiding damage to the high-voltage terminals.

[0057] When the electronic components of the high-voltage interlock circuit malfunction due to wear, aging, or other reasons, the high-voltage interlock circuit will disconnect. Simultaneously, a fault alarm will sound in the high-voltage interlock system, and the high-voltage circuit will be disconnected. This ensures timely disconnection of the high-voltage power supply, preventing electric shock or fire accidents and protecting the safety of personnel and vehicles.

[0058] Currently, when a high-voltage interlock system alarms, it is difficult to accurately determine the exact location where the high-voltage interlock circuit is disconnected, resulting in low efficiency in troubleshooting high-voltage interlock systems. To address these technical problems, this application provides a high-voltage interlock detection system and vehicle.

[0059] The following is a detailed description of a high-voltage interlock detection system and vehicle provided in the embodiments of this application, with reference to the accompanying drawings.

[0060] Please refer to Figure 1 and Figure 2 The first aspect of this application discloses a high-voltage interlock detection system 1, comprising a voltage sampling module 100, a voltage comparison module 200, and a controller 300. The voltage sampling module 100 is connected to a low-voltage detection connector 2 and is used to acquire a sampled voltage Vs. A reference voltage Vr is connected to the first input terminal of the voltage comparison module 200, and the second input terminal of the voltage comparison module 200 is connected to the output terminal of the voltage sampling module 100 and is used to receive the sampled voltage Vs. The voltage comparison module 200 generates a comparison signal Vc based on the reference voltage Vr and the sampled voltage Vs. The controller 300 is connected to the output terminal of the voltage comparison module 200 and is used to determine the operating state of the low-voltage detection connector 2 based on the comparison signal Vc. The controller 300 can be a vehicle control unit (VCU) or a microcontroller unit (MCU) of a battery management system (BMS).

[0061] In this embodiment, the sampling voltage Vs obtained by the voltage sampling module 100 differs depending on whether the low-voltage detection connector 2 is connected normally or abnormally. The voltage comparison module 200 compares the sampling voltage Vs with the reference voltage Vr to generate a comparison signal Vc reflecting whether the low-voltage detection connector 2 is connected normally. The controller 300 can then determine whether the low-voltage detection connector 2 is connected normally based on this comparison signal Vc. When a fault alarm occurs in the high-voltage interlock system, if the controller 300 obtains a comparison signal Vc indicating that a certain low-voltage detection connector 2 is not connected normally, the operator can accurately determine the fault in that low-voltage detection connector 2, quickly repair or replace it, and efficiently eliminate the fault in the high-voltage interlock system. Therefore, this application effectively solves the problem of low efficiency in eliminating faults in the high-voltage interlock system.

[0062] In some embodiments, the voltage sampling module 100 may employ a resistor divider structure. For example, see... Figure 2 The voltage sampling module 100 includes a first voltage divider circuit 110. The first voltage divider circuit 110 includes a plurality of voltage divider resistors connected in series; one end of one of the voltage divider resistors is connected to the first end of the low voltage detection connector 2 and the second input end of the voltage comparison module 200, and the other end is connected to the second end of the low voltage detection connector 2.

[0063] The first voltage divider circuit 110 is connected to the power supply voltage VCC to enable it to operate normally. Alternatively, an additional power module can be added to the vehicle to provide the power supply voltage VCC to the first voltage divider circuit 110, or a power module from another module in the vehicle can be reused. The specific configuration can be determined based on actual needs. For example, to improve the reliability of power supply to the first voltage divider circuit 110, an additional power module can be added to provide the power supply voltage VCC to the first voltage divider circuit 110; conversely, to save manufacturing costs, a power module from another module in the vehicle can be reused, meaning the first voltage divider circuit 110 can be connected to the existing power module in the vehicle to access the power supply voltage VCC. This application does not impose specific limitations on this approach.

[0064] The number of voltage-dividing resistors connected in series in the first voltage divider circuit 110 can be two, three, four, etc. One end of one of the voltage-dividing resistors is connected to the first terminal of the low-voltage detection connector 2 and the second input terminal of the voltage comparison module 200, and the other end is connected to the second terminal of the low-voltage detection connector 2. That is, one of the voltage-dividing resistors is connected in parallel with the low-voltage detection connector 2. When the low-voltage detection connector 2 is connected normally, this voltage-dividing resistor is short-circuited, and the voltage value at the first terminal of this voltage-dividing resistor is determined by the other voltage-dividing resistors. When the low-voltage detection connector 2 is not connected normally, the voltage value at the first terminal of this voltage-dividing resistor is determined by this voltage-dividing resistor and the other voltage-dividing resistors together.

[0065] like Figure 2 As shown, the first voltage divider circuit 110 may include a first voltage divider resistor R1, a second voltage divider resistor R2, and a third voltage divider resistor R3 connected in series; one end of the first voltage divider resistor R1 is connected to the working voltage; one end of the second voltage divider resistor R2 is connected to one end of the first voltage divider resistor R1, the first end of the low-voltage detection connector 2, and the second input terminal of the voltage comparison module 200; the other end of the second voltage divider resistor R2 is connected to one end of the third voltage divider resistor R3 and the second end of the low-voltage detection connector 2; the other end of the third voltage divider resistor R3 is grounded.

[0066] The resistance values ​​of the first voltage divider resistor R1, the second voltage divider resistor R2, and the third voltage divider resistor R3 can be equal or unequal. For the sake of simplicity in calculation, ease of description, and practical application, the following explanation assumes that the resistance values ​​of the first voltage divider resistor R1, the second voltage divider resistor R2, and the third voltage divider resistor R3 are equal.

[0067] When the low-voltage detection connector 2 is connected correctly, the second voltage divider resistor R2 is short-circuited. The voltage value at the first end of the second voltage divider resistor R2 is determined by the first voltage divider resistor R1 and the third voltage divider resistor R3. Since the resistance values ​​of the first voltage divider resistor R1, the second voltage divider resistor R2, and the third voltage divider resistor R3 are equal, Vs = 1 / 2 VCC. A suitable reference voltage Vr can be selected such that Vs < Vr. In this case, the comparison signal Vc output by the voltage comparator Com is high. Based on this high-level comparison signal Vc, the controller 300 can determine that the low-voltage detection connector 2 is connected correctly.

[0068] When the low-voltage detection connector 2 is not properly connected, the voltage value at the first end of the second voltage divider resistor R2 is determined by the first voltage divider resistor R1, the second voltage divider resistor R2, and the third voltage divider resistor R3. Since the resistance values ​​of the first voltage divider resistor R1, the second voltage divider resistor R2, and the third voltage divider resistor R3 are equal, Vs = 2 / 3Vcc. A suitable reference voltage Vr can be selected such that Vs > Vr. In this case, the comparison signal Vc output by the voltage comparator Com is low, and the controller 300 can determine that the low-voltage detection connector 2 is not properly connected based on this low-level comparison signal Vc.

[0069] To achieve control of the voltage sampling module 100 and reduce its energy consumption, see [reference needed]. Figure 3 In some embodiments, the high-voltage interlock detection system 1 may further include a switch module 600, which is connected in series with a voltage divider resistor, and the controlled terminal of the switch module 600 is connected to the controller 300. For example, Figure 3As shown, the switching module 600 can employ a bipolar junction transistor (BJT). The first terminal of the transistor is connected to one end of the first voltage-dividing resistor R1, and the second terminal is connected to one end of the second voltage-dividing resistor R2. The controlled terminal of the transistor is connected to the controller 300. The controller 300 can send control signals to the switching module 600 as needed or at a certain time period to control the switching module 600 to turn on, thereby controlling the voltage sampling module 100 to operate. When the switching module 600 is turned off, the voltage sampling module 100 is de-energized and stops operating, and the voltage-dividing resistors of the voltage sampling module 100 no longer consume energy. Therefore, controlling the voltage sampling module 100 to turn off and stop operating within a predetermined time period through the switching module 600 can effectively save energy.

[0070] Optionally, the switching module 600 may also employ an N-type metal-oxide-semiconductor (NMOS) field-effect transistor, a P-type metal-oxide-semiconductor (PMOS) field-effect transistor, an insulated gate bipolar transistor (IGBT), a relay circuit, or other devices or circuits capable of switching on and off. This application does not impose specific limitations on this.

[0071] To reduce interference when the controller 300 sends control signals to the switch module 600, see [reference needed]. Figure 3 In some embodiments, the high-voltage interlock detection system 1 may further include an isolation module 700, the first end of which is connected to the control terminal of the controller 300, and the second end of which is connected to the controlled terminal of the switch module 600.

[0072] The isolation module 700 can employ an optocoupler isolator. An optocoupler isolator is a device that transmits electrical signals using light as a medium, typically encapsulating a transmitter and receiver within the same housing. When an electrical signal is applied to the input, the transmitter emits light, and the receiver receives the light, generating a photocurrent that flows out from the output, thus achieving "electric-optical-electrical" control. The input and output of the optocoupler are completely electrically isolated, and the output signal has no effect on the input. It has advantages such as strong anti-interference capability and stable operation. By using an optocoupler isolator, interference received by the controller 300 when sending control signals to the switch module 600 can be reduced, thereby improving the reliability of control signal transmission and ultimately enhancing the control reliability of the controller 300 over the switch module 600.

[0073] In this optocoupler, the light emitter can be a light-emitting diode (LED), and the light receiver can be a photosensitive semiconductor tube (PST), a photoresistor, etc. When the LED is turned on, it illuminates, which in turn turns on the PST, thereby activating the output circuit and allowing it to output a control signal.

[0074] In some embodiments, see Figure 3 The voltage comparison module 200 may include a voltage comparator Com. The inverting input of the voltage comparator Com is connected to the output of the voltage sampling module 100, the non-inverting input of the voltage comparator Com is connected to a reference voltage Vr, and the output of the voltage comparator Com is connected to the controller 300. Thus, by comparing the sampled voltage Vs and the reference voltage Vr, the voltage comparison module 200 can obtain a comparison signal Vc reflecting whether the low-voltage detection connector 2 is properly connected. For example, when the voltage comparison module 200 uses a voltage comparator Com, if the reference voltage Vr connected to the non-inverting input is greater than the sampled voltage Vs at the inverting input, then the output comparison signal Vc is high, and the controller 300 can determine that the low-voltage detection connector 2 is properly connected based on this high-level comparison signal Vc. If the reference voltage Vr connected to the non-inverting input is less than the sampled voltage Vs at the inverting input, then the output comparison signal Vc is low, and the controller 300 can determine that the low-voltage detection connector 2 is not properly connected based on this low-level comparison signal Vc.

[0075] In one example, the high-voltage interlock detection system 1 provided in this application may further include a reference voltage module 400, wherein the reference voltage Vr may be provided by the reference voltage module 400. For example, as shown... Figure 3 As shown, the reference voltage module 400 may include a second voltage divider circuit 410, which outputs a reference voltage Vr to the voltage comparator Com. The second voltage divider circuit 410 includes a fourth voltage divider resistor R4 and a fifth voltage divider resistor R5 connected in series. The second voltage divider circuit 410 is connected to the power supply voltage VCC to ensure its normal operation. Alternatively, an additional power supply module can be added to the vehicle to provide the power supply voltage VCC to the second voltage divider circuit 410, or a power supply module from another module in the vehicle can be reused. The specific configuration can be determined based on actual needs. For example, to improve the reliability of power supply to the second voltage divider circuit 410, an additional power supply module can be added to provide the power supply voltage VCC to the second voltage divider circuit 410; conversely, to save manufacturing costs, a power supply module from another module in the vehicle can be reused, meaning the second voltage divider circuit 410 is connected to the existing power supply module in the vehicle to access the power supply voltage VCC. This application does not impose specific limitations on this approach.

[0076] Designers can select appropriate resistance values ​​for the fourth voltage divider resistor R4 and the fifth voltage divider resistor R5 according to actual needs. For example, the resistance of the fourth voltage divider resistor R4 can be selected to be 2 / 3 times the resistance of the fifth voltage divider resistor R5. In this case, the reference voltage Vr = 3 / 5Vcc. When the low-voltage detection connector 2 is connected correctly, Vs = 1 / 2Vcc < Vr = 3 / 5Vcc, and the comparison signal Vc output by the voltage comparator Com is high. When the low-voltage detection connector 2 is not connected correctly, Vs = 2 / 3Vcc > Vr = 3 / 5Vcc, and the comparison signal Vc output by the voltage comparator Com is low. The controller 300 can determine whether the low-voltage detection connector 2 is connected correctly based on this high or low level comparison signal Vc.

[0077] The inventors discovered that during use, the low-voltage detection connector 2, in addition to its own malfunction, may also short-circuit the power supply VCC and short-circuit to ground in the high-voltage interlock detection system 1 of the above embodiments. Based on this situation, see [reference needed]. Figure 4 In this embodiment of the application, the voltage comparison module 200 may include multiple voltage comparators Com. The inverting input terminal of the voltage comparator Com is connected to the output terminal of the voltage sampling module 100, the non-inverting input terminal of the voltage comparator Com is connected to a reference voltage Vr, and the output terminal of the voltage comparator Com is connected to the controller 300; wherein, the reference voltage Vr connected to the non-inverting input terminal of different voltage comparators Com is different. For example, as shown... Figure 4 As shown, the voltage comparison module 200 may include three voltage comparators Com, and the three reference voltages Vr1, Vr2, and Vr3 connected to the non-inverting input terminals of the three voltage comparators Com have different voltage values. The multiple different reference voltages Vr can be provided by the voltage module. See [link / reference] Figure 4 The voltage module may include multiple second voltage divider circuits 410, and the multiple second voltage divider circuits 410 are connected one-to-one with multiple voltage comparators Com; the reference voltage Vr output by different second voltage divider circuits 410 is different.

[0078] Based on multiple voltage comparison modules 200, this application embodiment combines multiple different reference voltages Vr and uses the combination of comparison signals Vc output by multiple voltage comparison modules 200 to not only determine that the low voltage detection connector 2 itself has a fault, but also to determine that the low voltage detection connector 2 has a short circuit to the power supply VCC terminal and a short circuit to ground.

[0079] See Figure 4In some embodiments, the number of voltage comparators Com can be three; the number of second voltage divider circuits 410 is three, each second voltage divider circuit 410 including a fourth voltage divider resistor R4 and a fifth voltage divider resistor R5 connected in series; wherein, the non-inverting input terminal of each voltage comparator Com is connected between the fourth voltage divider resistor R4 and the fifth voltage divider resistor R5 of one of the second voltage divider circuits 410.

[0080] like Figure 4 As shown, the non-inverting input terminals of the three voltage comparators Com can be denoted as Vr1, Vr2, and Vr3, respectively; the three fourth voltage divider resistors R4 can be denoted as R41, R42, and R43, respectively; and the three fifth voltage divider resistors R5 can be denoted as R51, R52, and R53, respectively. In the three second voltage divider circuits 410, one end of the fourth voltage divider resistor R41 of one second voltage divider circuit 410 is connected to one end of the fifth voltage divider resistor R51, and is also connected to the non-inverting input terminal Vr1 of one voltage comparator Com; one end of the fourth voltage divider resistor R42 of one second voltage divider circuit 410 is connected to one end of the fifth voltage divider resistor R52, and is also connected to the non-inverting input terminal Vr2 of one voltage comparator Com; one end of the fourth voltage divider resistor R43 of one second voltage divider circuit 410 is connected to one end of the fifth voltage divider resistor R53, and is also connected to the non-inverting input terminal Vr1 of one voltage comparator Com.

[0081] For example, in Figure 4 In the second voltage divider circuit 410 on the left, the resistance of the fourth voltage divider resistor R41 can be selected to be 3 times the resistance of the fifth voltage divider resistor R51. The reference voltage Vr1 provided by the second voltage divider circuit 410 is 1 / 4Vcc.

[0082] exist Figure 4 In the second voltage divider circuit 410 in the middle, the resistance value of the fourth voltage divider resistor R42 can be selected as 2 / 3 times the resistance value of the fifth voltage divider resistor R52. The reference voltage Vr2 provided by the second voltage divider circuit 410 is 3 / 5Vcc.

[0083] exist Figure 4 In the second voltage divider circuit 410 on the right, the resistance of the fourth voltage divider resistor R43 can be selected to be 1 / 5 times the resistance of the fifth voltage divider resistor R53. The reference voltage Vr3 provided by the second voltage divider circuit 410 is 5 / 6Vcc.

[0084] When the low-voltage detection connector 2 is connected normally, Vs = 1 / 2Vcc. At this time, Vr1 < Vs < Vr2 < Vr3. The comparison signals Vc1, Vc2, and Vc3 output from the three voltage comparators Com from top to bottom are low level, high level, and high level, respectively.

[0085] When the low-voltage detection connector 2 is not connected properly, Vs = 2 / 3Vcc. At this time, Vr1 < Vr2 < Vs < Vr3. The comparison signals Vc1, Vc2, and Vc3 output from the three voltage comparators Com from top to bottom are low level, low level, and high level, respectively.

[0086] When the low-voltage detection connector 2 is short-circuited to the power supply Vcc, Vs = Vcc. At this time, Vr1 < Vr2 < Vr3 < Vs. The comparison signals Vc1, Vc2, and Vc3 output from the three voltage comparators Com from top to bottom are low level, low level, and low level, respectively.

[0087] When the low-voltage detection connector 2 is short-circuited to the ground terminal of the power supply Vcc, Vs = 0. At this time, Vs < Vr1 < Vr2 < Vr3. The comparison signals Vc1, Vc2, and Vc3 output from the three voltage comparators Com from top to bottom are high level, high level, and high level, respectively.

[0088] The correspondence between the fault types of the low-voltage detection connector 2 and the comparison signals Vc1, Vc2, and Vc3 output from top to bottom at the output terminals of the three voltage comparators Com is shown in Table 1.

[0089] Fault type Vc1 Vc2 Vc3 Connection normal 0 1 1 Connection problem 0 0 1 Short circuit of power supply 0 0 0 Short circuit to ground 1 1 1

[0090] Table 1

[0091] In some embodiments, such as Figure 5 As shown, when multiple voltage comparators Com and multiple second voltage divider circuits 410 are used, the high-voltage interlock detection system 1 may further include a signal processing module 500, which is located adjacent to the multiple voltage comparators Com. The signal processing module 500 is connected to the multiple voltage comparators Com and the controller 300.

[0092] The signal processing module 500 can be the control chip in the vehicle's electronic control unit (ECU). The signal processing module 500 can communicate with the microcontroller unit (MCU) via the CAN bus, processing the comparison signals Vc from multiple voltage comparators Com and transmitting them to the controller 300. The controller 300 can then determine whether the low-voltage detection connector 2 has malfunctioned, the type of malfunction, and its specific location, enabling personnel to efficiently troubleshoot high-voltage interlock system faults.

[0093] In this embodiment, the signal processing module 500 can be located adjacent to the voltage comparator Com, meaning the voltage comparator Com can be connected to the adjacent signal processing module 500. This reduces the wiring harness connecting the voltage comparator Com and the controller 300, effectively lowering the complexity of their connection. Furthermore, reducing the wiring harness between the voltage comparator Com and the controller 300 avoids signal interruption caused by wiring failures (such as aging or damage), thereby improving the reliability of the controller 300's signal reception.

[0094] Secondly, a second aspect of this application also proposes a vehicle including the high-voltage interlock detection system 1 described in any of the above embodiments.

[0095] The vehicle provided in this application embodiment, having the high-voltage interlock detection system 1 described above, possesses all the beneficial effects of the high-voltage interlock detection system 1. The high-voltage interlock detection system 1 has been described in detail above and will not be repeated here.

[0096] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A high-voltage interlock detection system, applied to a high-voltage interlock circuit with a low-voltage detection connector, characterized in that, include: A voltage sampling module, which is connected to the low-voltage detection connector, is used to acquire the sampled voltage; A voltage comparison module has a first input terminal connected to a reference voltage and a second input terminal connected to the output terminal of a voltage sampling module for receiving the sampled voltage. The voltage comparison module is used to generate a comparison signal based on the reference voltage and the sampled voltage. as well as, A controller is connected to the output terminal of the voltage comparison module, and the controller is used to determine the working state of the low-voltage detection connector based on the comparison signal.

2. The high-voltage interlock detection system according to claim 1, characterized in that, The voltage sampling module includes: The first voltage divider circuit includes multiple voltage divider resistors connected in series; one end of one of the voltage divider resistors is connected to the first end of the low-voltage detection connector and the second input end of the voltage comparison module, and the other end is connected to the second end of the low-voltage detection connector.

3. The high-voltage interlock detection system according to claim 2, characterized in that, The first voltage divider circuit includes a first voltage divider resistor, a second voltage divider resistor, and a third voltage divider resistor connected in series; One end of the first voltage divider resistor is connected to the operating voltage; One end of the second voltage divider resistor is connected to the other end of the first voltage divider resistor, the first end of the low voltage detection connector, and the second input end of the voltage comparison module; The other end of the second voltage divider resistor is connected to one end of the third voltage divider resistor and the second end of the low-voltage detection connector; The other end of the third voltage divider resistor is grounded.

4. The high-voltage interlock detection system according to claim 1, characterized in that, The voltage comparison module includes: At least one voltage comparator, wherein the inverting input of the voltage comparator is connected to the output of the voltage sampling module, the non-inverting input of the voltage comparator is connected to the reference voltage, and the output of the voltage comparator is connected to the controller; The reference voltage connected to the non-inverting input terminal of different voltage comparators is different.

5. The high-voltage interlock detection system according to claim 4, characterized in that, The high-voltage interlock detection system also includes: A reference voltage module, the reference voltage module including at least one second voltage divider circuit, the second voltage divider circuit being connected to the voltage comparator one-to-one, the second voltage divider circuit being used to output the reference voltage to the voltage comparator; The reference voltage output by different second voltage divider circuits is different.

6. The high-voltage interlock detection system according to claim 5, characterized in that, The number of voltage comparators is three; The number of the second voltage divider circuits is three, and each second voltage divider circuit includes a fourth voltage divider resistor and a fifth voltage divider resistor connected in series; wherein, the non-inverting input terminal of each voltage comparator is connected between the fourth voltage divider resistor and the fifth voltage divider resistor of one of the second voltage divider circuits.

7. The high-voltage interlock detection system according to claim 5, characterized in that, The voltage comparator and the second voltage divider circuit are multiple; the high-voltage interlock detection system also includes: A signal processing module is disposed adjacent to a plurality of the voltage comparators; the signal processing module is connected to the output terminals of the plurality of voltage comparators and the controller.

8. The high-voltage interlock detection system according to claim 2, characterized in that, The high-voltage interlock detection system also includes: A switching module is connected in series with the voltage divider resistor, and the controlled terminal of the switching module is connected to the controller.

9. The high-voltage interlock detection system according to claim 8, characterized in that, The high-voltage interlock detection system also includes: An isolation module, wherein the first end of the isolation module is connected to the controller, and the second end of the isolation module is connected to the controlled end of the switch module.

10. A vehicle, characterized in that, include: The high-voltage interlock detection system as described in any one of claims 1 to 9.

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