Fault detection system and vehicle

Abstract

The invention provides a fault detection system and a vehicle, the fault detection system comprises a plurality of conversion modules, a plurality of detection modules and a microcontroller, and each conversion module can output a corresponding electric signal based on the connection state of a low-voltage detection connector; the plurality of detection modules receive the electric signals and output corresponding detection signals based on the electric signals; and the microcontroller receives detection signals from the plurality of detection modules, and determines the on-off state of the high-voltage interlocking loop and the connection state of the plurality of low-voltage detection connectors based on the plurality of detection signals. According to the system, the connection state of the low-voltage detection connector can be converted into a high-low level detection signal which can be identified by the microcontroller, so that the microcontroller can accurately know the fault position and the on-off state of the high-voltage interlocking loop based on the detection signal, the detection and troubleshooting efficiency is improved, the detection reliability is relatively high, and the reliability is relatively high. The problem that the efficiency of eliminating faults of the high-voltage interlocking system is low is effectively solved, and certain safety is improved.

Description

Technical Field

[0001] The present application relates to the technical field of high voltage interlock detection, and more particularly, to a fault detection system and a vehicle. Background Art

[0002] With the development of new energy vehicles, electrification has gradually become a trend. Electric vehicles are usually equipped with high-voltage electrical systems, which are used to power high-power electrical equipment (such as motors) in the vehicle. In order to detect the working status of the high-voltage electrical system in real time, a high-voltage interlock (High Voltage Interlock Loop, HVIL) system is usually installed in the vehicle. The high-voltage interlock system is equipped with multiple high-voltage connectors and corresponding low-voltage detection connectors. Each high-voltage connector usually has an interlocking contact, which is connected to a complete high-voltage interlocking circuit through wires. The high-voltage interlocking 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 high-voltage interlocking system of the related art is usually also provided with a high-voltage interlocking detection circuit and a control system. Once the high-voltage interlocking detection circuit detects that the high-voltage interlocking circuit is disconnected, it will immediately send a signal to the control system, so that the control system cuts off the high-voltage output of all loads to ensure safety. However, the high-voltage interlocking detection circuit in the related art cannot accurately detect the specific location where the high-voltage interlocking circuit is disconnected, resulting in low efficiency in troubleshooting the high-voltage interlocking system. Summary of the invention

[0004] The present application provides a fault detection system and a vehicle, which are intended to solve the problem that the high-voltage interlock detection circuit cannot accurately detect the specific location where the high-voltage interlock circuit is disconnected, resulting in low efficiency in troubleshooting high-voltage interlock system faults.

[0005] In a first aspect, a fault detection system is provided, which is applied to a high-voltage interlocking circuit having multiple low-voltage detection connectors; the fault detection system includes multiple conversion modules, multiple detection modules and a microcontroller, the multiple conversion modules are connected in series in sequence, and are respectively connected one-to-one with the multiple low-voltage detection connectors, each conversion module can output a corresponding electrical signal based on the connection status of the low-voltage detection connector; the multiple detection modules are respectively connected one-to-one with the multiple conversion modules, the multiple detection modules receive the electrical signals, and output corresponding detection signals based on the electrical signals; the microcontroller is connected to the multiple detection modules to receive detection signals from the multiple detection modules, and the microcontroller is used to determine the on-off state of the high-voltage interlocking circuit and the connection state of the multiple low-voltage detection connectors based on the multiple detection signals.

[0006] In the above technical scheme, the conversion module provided by the present application can convert the connection state of the low-voltage detection connector into high and low level signals recognizable by the detection module, that is, the conversion module can convert the connection state of the low-voltage detection connector in real time, so that the detection module can generate a corresponding detection signal based on the electrical signal converted by the conversion module to achieve accurate detection. The detection module will output the generated detection signal to the microcontroller, so that the microcontroller can accurately know the on-off state of the high-voltage interlocking circuit and the specific fault location (that is, the abnormally connected low-voltage detection connector) based on the detection signal, thereby achieving accurate detection of the connection state of the low-voltage detection connector and the on-off state of the high-voltage interlocking circuit, so that the staff can determine the fault of the low-voltage detection connector, quickly repair or replace the low-voltage detection connector, improve the detection and troubleshooting efficiency, effectively solve the problem of low efficiency in troubleshooting high-voltage interlocking system faults, and improve a certain degree of safety. Secondly, compared with the control system in the related art that needs to receive signals from different sub-control units for processing, the present application receives and processes detection signals from different detection modules through the same microcontroller, which has a fast response speed, and receives multiple detection signals through the same microcontroller, and the synchronization of the received detection signals is high, so as to ensure the real-time detection and detection accuracy of the microcontroller. In addition, there is no need to set up additional sub-control units in the high-voltage interlock detection system, which saves production costs and simplifies the system structure.

[0007] In combination with the first aspect, in some possible implementations, each detection module includes a comparison unit, a first input terminal of the comparison unit is connected to a reference voltage, a second input terminal of the comparison unit is connected to the conversion module, an output terminal of the comparison unit is connected to the detection module, and the comparison unit is used to generate a detection signal based on the reference voltage and the electrical signal, and send the detection signal to the detection module.

[0008] In the above technical solution, the comparison unit can generate a corresponding detection signal based on the reference voltage and the electrical signal output by the conversion module, and the detection is simple. Secondly, by selecting a suitable reference voltage, high sensitivity to slight changes in the electrical signal can be achieved, the detection reliability is high, and the response speed is fast.

[0009] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the comparison unit includes a comparator, a first resistor, a second resistor and a first capacitor; the inverting input terminal of the comparator is connected to the conversion module, the non-inverting input terminal of the comparator is connected to one end of the first resistor and one end of the second resistor, the output terminal of the comparator is connected to the other end of the first resistor and the detection module, the other end of the second resistor is connected to the first plate of the first capacitor and is connected to the reference voltage, and the second plate of the first capacitor is grounded.

[0010] In the above technical solution, the comparison principle of the comparator is simple, and only a reference voltage (i.e., the reference voltage) and an input signal (i.e., the electrical signal output by the conversion module) are required to realize the detection of high and low levels, and the detection process is relatively simple. By selecting a suitable one, high-sensitivity detection of small changes in the input electrical signal can be achieved, and the detection accuracy and detection reliability are high. Different comparison thresholds can be set by adjusting the size of the reference voltage, thereby realizing multi-level detection, and the detection flexibility is high. Secondly, the response time of the comparator is very fast, and the switching of high and low levels can be completed within a few nanoseconds to realize real-time monitoring of the low-voltage detection connector, and the power consumption and cost are low.

[0011] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the fault detection system also includes a voltage divider module, a first end of the voltage divider module is connected to the power supply voltage, a second end of the voltage divider module is grounded, a third end of the voltage divider module is connected to the first input end of the comparison unit, and the voltage divider module is used to provide a reference voltage to the comparison unit.

[0012] In the above technical solution, a stable reference voltage can be generated from the power supply voltage through the voltage divider module, and the voltage divider module can limit the current flowing into the first input terminal of the comparison unit to prevent excessive current from damaging the comparison unit and further affecting the comparison and detection of the comparison unit, thereby improving the comparison and detection reliability of the comparison unit.

[0013] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, each detection module also includes an amplification unit, which is connected to the conversion module and the second input end of the comparison unit. The amplification unit is used to receive the electrical signal, amplify the electrical signal, and output it to the comparison unit.

[0014] In the above technical solution, the amplification unit amplifies the electrical signal, thereby enhancing the amplitude of the electrical signal, so that it can be more easily detected by the subsequent comparison unit. By amplifying the electrical signal output by the conversion module, the sensitivity of the entire detection module to small voltage changes can be improved to improve the overall detection accuracy of the detection module. Secondly, the amplification unit can also effectively suppress common-mode noise, thereby improving the signal-to-noise ratio of the received electrical signal, so as to improve the reliability of the subsequent comparison unit generating a detection signal based on the electrical signal, thereby improving the overall detection reliability of the detection module.

[0015] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the amplification unit includes an operational amplifier, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor; one end of the third resistor is connected to one end of the conversion module, the other end of the third resistor is connected to the in-phase input terminal of the operational amplifier and one end of the fifth resistor, the other end of the fifth resistor is grounded, one end of the fourth resistor is connected to the other end of the conversion module, the other end of the fourth resistor is connected to the inverting input terminal of the operational amplifier and one end of the sixth resistor, and the output end of the operational amplifier is connected to the second input terminal of the comparison unit and the other end of the sixth resistor.

[0016] In the above technical solution, the two input terminals of the operational amplifier are respectively connected to the two ends of the conversion module. It can be understood that the operational amplifier receives the voltage difference (i.e., the differential signal) at the two ends of the conversion module. The operational amplifier will amplify this voltage difference, thereby enhancing the amplitude of the electrical signal transmitted to the comparison unit, and improving the reliability of the subsequent comparison unit generating a detection signal based on the electrical signal. Secondly, the operational amplifier, as a signal preprocessing unit, can adjust the electrical signal to a range suitable for the operation of the comparison unit. For example, assuming that the amplitude of the electrical signal is small, the operational amplifier can amplify it to the threshold range of the operational amplifier to improve the reliability of the electrical signal connected to the comparison unit, thereby improving the overall detection reliability of the detection module.

[0017] In combination with the first aspect and the above-mentioned implementations, in some possible implementations, the conversion module includes a seventh resistor, one end of the seventh resistor is connected to one end of the third resistor and the first end of the low voltage detection connector as one end of the conversion module, and the other end of the seventh resistor is connected to one end of the fourth resistor and the second end of the low voltage detection connector as the other end of the conversion module.

[0018] In the above technical solution, when the connection state of the low voltage detection connector is a normal connection, the voltage difference across the seventh resistor is 0V, and the electrical signal output by the seventh resistor is a low level signal; when the connection state of the low voltage detection connector is an abnormal connection, there is a voltage difference across the seventh resistor, and the voltage difference is greater than 0V, and the electrical signal output by the seventh resistor is a high level signal. In this way, by detecting the voltage difference across the seventh resistor, the connection state of the low voltage detection connector connected thereto can be easily determined, and the seventh resistor can autonomously convert the connection state of the low voltage detection connector, that is, the connection state of the low voltage detection connector can be converted into a high or low level signal recognizable by the detection module through the seventh resistor, so that the fault detection system can realize autonomous detection based on the seventh resistor, without relying on the control of the microcontroller or other systems, and the detection flexibility is high.

[0019] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the fault detection system also includes an eighth resistor, a first switch module and a current source; one end of the eighth resistor is connected to the microcontroller; the first end of the first switch module is connected to the other end of the eighth resistor, the second end of the first switch module is grounded, and the third end of the first switch module is connected to the first conversion module among the multiple conversion modules; one end of the current source is connected to the fourth end of the first switch module, and the other end of the current source is connected to the last conversion module among the multiple conversion modules.

[0020] In the above technical solution, when the fault detection system is required to perform detection, the microcontroller controls the first switch module to be turned on, and the loop formed between the first switch module and the ground terminal is turned on, so that the current source is loaded into the loop where the conversion module is located, so that the conversion module can operate normally. When the fault detection system is not required to perform detection, the microcontroller controls the first switch module to be turned off, so that the current source is not loaded into the loop where the conversion module is located, and the conversion module does not work at this time. In this way, the microcontroller can reduce the energy consumption of the fault detection system and save a certain amount of energy by controlling the second switch module to be turned off.

[0021] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the fault detection system also includes a ninth resistor and a second switch module; one end of the ninth resistor is connected to the power supply voltage; the first end of the second switch module is connected to the other end of the ninth resistor, the second end of the second switch module is connected to the first conversion module among the multiple conversion modules, and the controlled end of the second switch module is connected to the microcontroller.

[0022] In the above technical solution, when the fault detection system is required to perform detection, the microcontroller controls the second switch module to be turned on, so that the power supply voltage is loaded into the loop where the conversion module is located, so that the fault detection system can operate normally. When the fault detection system is not required to perform detection, the microcontroller controls the second switch module to be turned off, so that the power supply voltage is not loaded into the loop where the conversion module is located, and the conversion module and other modules do not work at this time. In this way, the microcontroller can reduce the energy consumption of the fault detection system and save a certain amount of energy by controlling the second switch module to be turned off.

[0023] In a second aspect, an embodiment of the present application provides a vehicle, comprising a high-voltage interlocking circuit and a fault detection system as described in any optional manner of the first aspect, wherein the high-voltage interlocking circuit is provided with a plurality of low-voltage detection connectors, and the fault detection system is connected to the plurality of low-voltage detection connectors. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of a module structure of a vehicle provided in an embodiment of the present application;

[0025] Figure 2It is a schematic diagram of the module structure of a fault detection system provided in an embodiment of the present application;

[0026] Figure 3 is a schematic diagram of the module structure of another fault detection system provided in an embodiment of the present application;

[0027] Figure 4 is a circuit structure diagram of a fault detection system provided in an embodiment of the present application;

[0028] Figure 5 is a circuit structure diagram of another fault detection system provided in an embodiment of the present application;

[0029] Figure 6 It is a schematic diagram of the module structure of another fault detection system provided in an embodiment of the present application;

[0030] Figure 7 is a circuit structure diagram of another fault detection system provided in an embodiment of the present application;

[0031] Figure 8 is a circuit structure diagram of another fault detection system provided in an embodiment of the present application;

[0032] Fig. 9 is a circuit structure diagram of another fault detection system provided in an embodiment of the present application;

[0033] Fig.10 is a circuit structure diagram of another fault detection system provided in an embodiment of the present application;

[0034] Fig.11 This is a circuit structure diagram of another fault detection system provided in an embodiment of the present application.

[0035] Among them, the reference numerals in the figure are:

[0036] 1. Fault detection system; 11. Conversion module; 12. Detection module; 121. Comparison unit; 122. Amplification unit; 13. Microcontroller; 14. Voltage divider module; 15. Second switch module; 16. First switch module; 2. Low voltage detection connector;

[0037] VCC, power supply voltage; VREF, reference voltage; COMP, comparator; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7, seventh resistor; R8, eighth resistor; R9, ninth resistor; R10, tenth resistor; R11, eleventh resistor; R12, twelfth resistor; C1, first capacitor; OP, operational amplifier; CCS, current source. DETAILED DESCRIPTION

[0038] The technical solution in the present application will be described clearly and in detail below in conjunction with the accompanying drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0039] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0040] At present, new energy vehicles are widely used in various scenarios instead of internal combustion engine vehicles. Compared with internal combustion engine vehicles, new energy vehicles produce less noise during driving and do not directly emit exhaust gas, which is more environmentally friendly. At the same time, new energy vehicles are intelligent, have higher energy efficiency conversion rate and lower maintenance cost, so more and more people are starting to use new energy vehicles as a means of transportation. New energy vehicles are usually equipped with power batteries to provide power sources for vehicles and drive motors. For example, the power battery will output direct current to the motor, and the motor controller (Motor Control Unit, MCU) will convert the direct current provided by the power battery into three-phase alternating current for the drive motor 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, acceleration and deceleration, braking, energy recovery, etc., so as to ensure the normal operation of the vehicle.

[0041] New energy vehicles are usually equipped with two electrical systems, high voltage and low voltage. Among them, a high voltage battery (such as a power battery) is provided in the high voltage electrical system. The high voltage battery is used to power high-power electrical equipment (such as a motor) in the vehicle to drive the vehicle to maintain 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 controller, and the charging voltage is usually about several hundred volts. In order to ensure the safety of the driver, passengers and vehicles, 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. The high voltage connector is used to connect various components in the high voltage electrical system (such as high voltage components such as high voltage batteries, motors, inverters, etc.) to ensure the safe transmission of high voltage current. Each high voltage connector usually has an interlocking contact, which is connected in series through wires to form a complete high voltage interlocking circuit. The high voltage interlocking circuit 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.

[0042] The high-voltage connector may be loose or fall off, and the high-voltage interlocking circuit is abnormal. In order to grasp the connection status of the high-voltage interlocking circuit in real time, the high-voltage interlocking system in the related art usually also includes a high-voltage interlocking detection circuit. The high-voltage interlocking 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 interlocking circuit to ensure the reliable transmission of the signal. It is usually distributed between various nodes in the high-voltage interlocking circuit. The low-voltage detection port is used to send and receive low-voltage signals (such as 5V or 12V low-voltage signals) to detect the state of the high-voltage interlocking circuit. Its detection principle is usually: before the vehicle starts, the control system will send a low-voltage excitation signal through the low-voltage detection port. This excitation signal will be transmitted through the low-voltage detection connector and along the interlocking contacts of all high-voltage connectors in the high-voltage interlocking circuit. If all high-voltage connectors are correctly connected, the excitation signal will be smoothly 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 that matches the sent excitation signal, it means that all high voltage connectors are correctly connected and the high voltage interlock circuit is normal. At this time, the control system will activate the high voltage power supply and the high voltage electrical system will start working. Once a high voltage interlock circuit fault is detected, the control system will take the same approach, that is, cut off the high voltage output of all loads.

[0043] However, the high-voltage interlock detection circuit in the related art can usually only detect whether the high-voltage interlock circuit has a fault, and cannot accurately locate the specific location of the fault, resulting in low efficiency in troubleshooting the high-voltage interlock system. Secondly, in the related art, a plurality of sub-control units are also provided in the high-voltage interlock detection circuit, and the plurality of sub-control units process the detected multiple signals respectively and then send them to the control system, so that the control system cuts off the response. In this way, the control system needs to receive signals from different sub-control units for processing, the signal response speed is slow, and the synchronization of the signals received by the control system is poor. There are many sub-control units in the high-voltage interlock detection circuit, resulting in a high production cost of the system.

[0044] To this end, an embodiment of the present application provides a fault detection system and a vehicle, wherein the fault detection system can convert the connection status of a low-voltage detection connector into high and low level detection signals recognizable by a microcontroller, so that the microcontroller can accurately know the fault location (i.e., the abnormally connected low-voltage detection connector) and the on / off status of the corresponding high-voltage interlocking circuit based on the detection signal, thereby improving the detection and troubleshooting efficiency, achieving high detection reliability, and effectively solving the problem of low efficiency in troubleshooting high-voltage interlocking system faults.

[0045] The fault detection system and vehicle provided in the embodiments of the present application are exemplarily introduced below with reference to the accompanying drawings.

[0046] The embodiment of the present application provides a vehicle, and the vehicle provided by the present application includes a high-voltage electrical system and a low-voltage electrical system, wherein a high-voltage battery (such as a power battery) is provided in the high-voltage electrical system, and the high-voltage battery is used to power high-power electrical equipment in the vehicle (such as motors, inverters and other high-voltage components) to drive the vehicle to maintain normal driving. At the same time, the power battery will also charge the low-voltage battery in the low-voltage electrical system under the control of the vehicle controller. A low-voltage battery (such as a 12V battery) and a direct current converter (Direct Current to Direct Current Converter, DCDC) are provided in the low-voltage electrical system. The direct current converter can convert the high voltage electricity of the high-voltage battery into low voltage electricity to meet the transmission / control of signals in the vehicle, which will not be described in detail.

[0047] Among them, the voltage in the high-voltage electrical system is usually above hundreds of volts. When repairing or inspecting the vehicle, personnel may accidentally touch the high-voltage components that are not completely disconnected, resulting in electric shock accidents. Secondly, the short circuit or poor connection of the high-voltage electrical system may cause sparks or overheating, which in turn causes fires, and there are great safety hazards. To this end, the vehicle provided by the present application is provided with a high-voltage interlocking system, which includes a high-voltage connector, which is used to connect various components in the high-voltage electrical system to ensure the safe transmission of high-voltage current. Each high-voltage connector usually has an interlocking contact, which is connected in series through wires to form a complete high-voltage interlocking circuit. The high-voltage interlocking circuit can ensure that when the high-voltage connector is not completely connected or disconnected, the high-voltage power supply will not be activated, thereby preventing personnel from contacting the live high-voltage components. At the same time, when the high-voltage electrical system is short-circuited or poorly connected, the high-voltage interlocking circuit can quickly cut off the high-voltage power supply to prevent fires caused by electrical faults.

[0048] In order to realize the fault detection of the high voltage interlocking circuit, in one example, Figure 1 As shown, the vehicle provided by the present application also includes a fault detection system 1 and a plurality of low-voltage detection connectors 2. The low-voltage detection connector 2 is arranged in a high-voltage interlocking circuit (not shown in the figure) and corresponds to a high-voltage connector (not shown in the figure). The fault detection system 1 in the present application can realize the fault detection of the high-voltage interlocking circuit and the precise positioning of the fault by detecting the connection state of the low-voltage detection connector. 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 connectors correspond to the low-voltage detection connectors one by one to ensure that the state of each high-voltage connector can be detected independently, thereby improving the safety of the system; when the number of low-voltage detection connectors is less than the number of high-voltage connectors, multiple high-voltage connectors can be connected to the same low-voltage detection connector to save manufacturing costs. It can be set according to actual needs. This application does not make specific restrictions.

[0049] In order to enable the fault detection system 1 to accurately detect the connection status of multiple low-voltage detection connectors 2 and avoid the problem that the connection harness between the multiple low-voltage detection connectors 2 and the fault detection system 1 is too long and affects the detection reliability, in one example, Figure 2As shown, the fault detection system 1 includes a plurality of conversion modules 11, a plurality of detection modules 12 and a microcontroller 13. The plurality of conversion modules 11 are sequentially connected in series and are respectively connected to a plurality of low-voltage detection connectors 2 in one-to-one correspondence. The plurality of detection modules 12 are respectively connected to a plurality of conversion modules 11 in one-to-one correspondence. The microcontroller 13 is connected to a plurality of detection modules 12. It can be understood that each detection module 12 and the correspondingly connected conversion module 11 constitute a detection branch, and each detection branch is used to detect the connection state of the corresponding low-voltage detection connector 2 to detect the on-off state of the entire high-voltage interlocking circuit.

[0050] It is worth noting that if Figure 2 As shown, multiple conversion modules 11 are connected in series in sequence and are respectively connected to multiple low-voltage detection connectors 2 one by one, wherein the conversion module 11 located at the first position among the multiple conversion modules 11 is the first conversion module 11, which is used to access the power supply voltage VCC, and the conversion module 11 located at the end of the multiple conversion modules 11 is the last conversion module 11, which is used for grounding.

[0051] In this example, each conversion module 11 can output a corresponding electrical signal based on the connection state of the low-voltage detection connector 2, the detection module 12 receives the electrical signal transmitted by the correspondingly connected conversion module 11, and outputs a corresponding detection signal based on the electrical signal, the microcontroller 13 receives the detection signals from multiple detection modules 12, and the microcontroller 13 can determine the on-off state of the high-voltage interlocking circuit and the connection state of multiple low-voltage detection connectors 2 based on multiple detection signals. Among them, the connection state includes normal connection and abnormal connection. When the low-voltage detection connector 2 is normally connected, the high-voltage interlocking circuit is connected, that is, the high-voltage interlocking circuit is normal; abnormal connection refers to the situation that the low-voltage detection connector 2 is loose, falls off, etc. At this time, the low-voltage detection connector 2 is abnormally connected, resulting in the disconnection of the high-voltage interlocking circuit, that is, the high-voltage interlocking circuit is abnormal.

[0052] Among them, one end of the conversion module 11 is connected to the first end of the low voltage detection connector 2, and the other end of the conversion module 11 is connected to the second end of the low voltage detection connector 2, so that the conversion module 11 can output a corresponding electrical signal based on the connection state of the low voltage detection connector 2. When the low voltage detection connector 2 corresponding to the conversion module 11 is normally connected, the conversion module 11 will not receive current, and the voltage across the conversion module 11 is zero at this time, and the electrical signal output by the conversion module 11 can be a low-level signal indicating that the connection state of the low voltage detection connector 2 is normally connected; when the low voltage detection connector 2 corresponding to the conversion module 11 is abnormally connected, the conversion module 11 will receive current, and the voltage across the conversion module 11 is high at this time, that is, the electrical signal output by the conversion module 11 can be a high-level signal indicating that the connection state of the low voltage detection connector 2 is abnormally connected.

[0053] It can be understood that the conversion module 11 provided in the present application can convert the connection status of the low-voltage detection connector 2 into high and low level signals that can be recognized by the detection module 12, and the detection module 12 can generate corresponding detection signals based on the high and low level signals and output them to the microcontroller 13, so that the microcontroller 13 can determine the connection status of multiple low-voltage detection connectors 2 and the on-off status of the corresponding high-voltage interlocking circuit based on multiple detection signals.

[0054] Exemplarily, when the connection status of all low-voltage detection connectors 2 is normally connected, multiple conversion modules 11 can convert the connection status of the normal connection into a corresponding electrical signal. The electrical signal at this time is a low-level signal indicating that the connection status of the low-voltage detection connector 2 is normally connected. Multiple conversion modules 11 output the corresponding low-level signal to the detection modules 12 connected to each other. Multiple detection modules 12 respectively generate corresponding detection signals based on the received low-level signals. The detection signal at this time can be a high-level detection signal. Multiple detection modules 12 send the corresponding high-level detection signal to the microcontroller 13. The microcontroller 13 can determine that the low-voltage detection connectors 2 are all normally connected at this time based on the high-level detection signals from the multiple detection modules 12, and the high-voltage interlocking circuit remains connected, that is, the high-voltage interlocking circuit has not failed at this time.

[0055] Exemplarily, when the connection state of one of the low-voltage detection connectors 2 is abnormal connection, and the connection state of the other low-voltage detection connectors 2 is normal connection, the conversion module 11 corresponding to one of the low-voltage detection connectors 2 can convert the abnormal connection state into a corresponding electrical signal, and the electrical signal at this time is a high-level signal indicating that the connection state of the low-voltage detection connector 2 is abnormal connection. The conversion module 11 will output the corresponding high-level signal to the detection module 12 connected thereto, and the detection module 12 generates a corresponding detection signal based on the received high-level signal, and the detection signal at this time can be a low-level detection signal, and the detection module 12 sends the corresponding low-level detection signal to the microcontroller 13. The conversion modules 11 corresponding to the other low-voltage detection connectors 2 can convert the normal connection state into a corresponding electrical signal, and the electrical signal at this time is a low-level signal indicating that the connection state of the low-voltage detection connector 2 is normal connection. Multiple conversion modules 11 output corresponding low-level signals to the detection modules 12 connected thereto, and multiple detection modules 12 respectively generate corresponding detection signals (high-level detection signals) based on the received low-level signals, and multiple detection modules 12 send corresponding high-level detection signals to the microcontroller 13. The microcontroller 13 can determine that the corresponding low-voltage detection connector 2 is abnormally connected based on the low-level detection signal, and can determine that the corresponding low-voltage detection connectors 2 are all normally connected based on the high-level detection signal. It can be understood that if any one of the multiple low-voltage detection connectors 2 is abnormally connected, the high-voltage interlocking circuit is shut down, that is, the microcontroller 13 can determine that the high-voltage interlocking circuit is faulty based on the low-level detection signal. When a high-voltage interlocking circuit fault is detected and the fault location is determined (i.e., the low-voltage detection connector 2 with abnormal connection), the staff can repair or replace the low-voltage detection connector 2 based on the fault location to efficiently eliminate the high-voltage interlocking system fault.

[0056] It can be understood that the conversion module 11 in the present application can autonomously convert the connection state of the low-voltage detection connector 2, that is, the fault detection system 1 can realize autonomous detection through the conversion module 11 and the detection module 12, without relying on the control of the microcontroller or other systems, and the detection flexibility is high.

[0057] In this way, the conversion module 11 provided in the present application can convert the connection state of the low-voltage detection connector 2 into high and low level signals that can be recognized by the detection module 12, that is, the conversion module 11 can convert the connection state of the low-voltage detection connector 2 in real time, so that the detection module 12 can generate a corresponding detection signal based on the electrical signal converted by the conversion module 11 to achieve accurate detection. The detection module 12 will output the generated detection signal to the microcontroller 13, so that the microcontroller 13 can accurately know the on-off state of the high-voltage interlocking circuit and the specific fault location (that is, the abnormally connected low-voltage detection connector 2) based on the detection signal, 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 circuit, so that the staff 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 high-voltage interlocking system faults, and improving a certain degree of safety. Secondly, compared with the control system in the related art that needs to receive signals from different sub-control units for processing, the present application receives and processes detection signals from different detection modules 12 through the same microcontroller 13, which has a fast response speed, and receives multiple detection signals through the same microcontroller 13, and the synchronization of the received detection signals is high, so as to ensure the real-time detection and detection accuracy of the microcontroller 13. In addition, there is no need to set up additional sub-control units in the high-voltage interlock detection system 1, which saves manufacturing costs and simplifies the system structure.

[0058] Optionally, the microcontroller 13 may be a microcontroller unit (MCU).

[0059] In one example, if Figure 3 As shown, each detection module 12 includes a comparison unit 121, a first input terminal of the comparison unit 121 is connected to a reference voltage VREF, a second input terminal of the comparison unit 121 is connected to the conversion module 11, an output terminal of the comparison unit 121 is connected to the microcontroller 13, and the comparison unit 121 is used to generate a detection signal based on the reference voltage VREF and an electrical signal, and send the detection signal to the microcontroller 13. It is worth noting that the reference voltage VREF connected to the multiple comparison units 121 is the same reference voltage.

[0060] In this example, when the low voltage detection connector 2 is connected normally, the conversion module 11 will output a corresponding low level signal to the comparison unit 121. At this time, the voltage corresponding to the low level signal is zero. The comparison unit 121 compares the low level signal with the reference voltage VREF and obtains a corresponding high level detection signal; when the low voltage detection connector 2 is abnormally connected, the conversion module 11 will output a corresponding high level signal to the comparison unit 121. At this time, the voltage corresponding to the high level signal is a high level. The comparison unit 121 compares the high level signal with the reference voltage VREF and obtains a corresponding low level detection signal. It can be understood that the reference voltage VREF at this time is a reference voltage. When the electrical signal (e.g., a low level signal) is less than the reference voltage VREF, the comparison unit 121 outputs a high level detection signal; when the electrical signal (e.g., a high level signal) is greater than the reference voltage VREF, the comparison unit 121 outputs a low level detection signal.

[0061] In this way, the comparison unit 121 can generate a corresponding detection signal based on the reference voltage VREF and the electrical signal output by the conversion module 11, and the detection is simple. Secondly, by selecting a suitable reference voltage VREF, high sensitivity to slight changes in the electrical signal can be achieved, the detection reliability is high, and the response speed is fast.

[0062] In one example, if Figure 4 As shown, the comparison unit 121 includes a comparator COMP, a first resistor R1, a second resistor R2 and a first capacitor C1. The inverting input terminal (eg Figure 4 The “-” as shown in FIG. 1 is connected to the conversion module 11 as the second input terminal of the comparison unit 121, and the non-inverting input terminal of the comparator COMP (as shown in FIG. Figure 4 The "+" as shown) is connected to one end of the first resistor R1 and one end of the second resistor R2, the output end of the comparator COMP is connected to the other end of the first resistor R1 and the microcontroller 13, the other end of the second resistor R2 is connected to the first plate of the first capacitor C1, and the reference voltage VREF is connected to the first input end of the comparison unit 121, and the second plate of the first capacitor C1 is grounded.

[0063] In this example, when the low voltage detection connector 2 is normally connected, the conversion module 11 will output a corresponding low level signal to the comparison unit 121. At this time, the voltage corresponding to the low level signal is zero, and the low level signal connected to the inverting output terminal of the comparator COMP is less than the reference voltage VREF connected to the non-inverting output terminal of the comparator COMP. The comparator COMP correspondingly outputs a high level detection signal to the microcontroller 13, so that the microcontroller 13 can know that the connection state of the corresponding low voltage detection connector 2 is normally connected based on the high level detection signal, so as to know that the high voltage interlocking circuit is connected without fault. When the low voltage detection connector 2 is abnormally connected, the conversion module 11 will output a corresponding high level signal to the comparison unit 121. At this time, the voltage corresponding to the high level signal is high level, and the low level signal connected to the inverting output terminal of the comparator COMP is greater than the reference voltage VREF connected to the non-inverting output terminal of the comparator COMP. The comparator COMP correspondingly outputs a low level detection signal to the microcontroller 13, so that the microcontroller 13 knows that the connection state of the corresponding low voltage detection connector 2 is abnormal based on the low level detection signal, so as to know that the high voltage interlocking circuit is disconnected and faulty.

[0064] Among them, the comparison principle of the comparator COMP is simple, and only a reference voltage (i.e., the reference voltage VREF) and an input signal (i.e., the electrical signal output by the conversion module 11) are required to realize the detection of high and low levels, and the detection process is relatively simple. By selecting a suitable VREF, high-sensitivity detection of small changes in the input electrical signal can be achieved, and the detection accuracy and detection reliability are high. By adjusting the size of the reference voltage VREF, different comparison thresholds can be set, thereby realizing multi-level detection, and the detection flexibility is high. Secondly, the response time of the comparator COMP is very fast, and the switching of high and low levels can be completed within a few nanoseconds to realize real-time monitoring of the low-voltage detection connector 2, and the power consumption and cost are low.

[0065] The comparator COMP, the first resistor R1 and the second resistor R2 together constitute a hysteresis comparator circuit, wherein the first resistor R1 is located between the in-phase input terminal of the comparator COMP and the output terminal of the comparator COMP, so as to prevent the comparator COMP from frequently switching the output state when the input signal (i.e., the electrical signal output by the conversion module 11) is close to the reference voltage (i.e., the reference voltage VREF), thereby improving the stability of the circuit. For example, when the comparator COMP outputs a high-level detection signal, part of the output voltage is fed back to the in-phase input terminal of the comparator COMP through the first resistor R1, thereby increasing the threshold value of the next switching. Similarly, when the comparator COMP outputs a low-level detection signal, part of the output voltage is fed back to the in-phase input terminal of the comparator COMP through the first resistor R1, thereby reducing the threshold value of the next switching. The first capacitor C1 can improve the stability of the reference voltage VREF connected to the comparator COMP, so as to improve the comparison and detection reliability of the comparator COMP.

[0066] When there are multiple low voltage detection connectors 2 , each detection module 12 corresponding to the low voltage detection connector 2 is provided with a comparator COMP, a first resistor R1 , a second resistor R2 and a first capacitor C1 , wherein the second plates of the multiple first capacitors C1 are interconnected and grounded.

[0067] In one example, if Figure 5 As shown, the fault detection system 1 further includes a voltage divider module 14, a first end of the voltage divider module 14 is connected to the power supply voltage VCC, a second end of the voltage divider module 14 is grounded, and a third end of the voltage divider module 14 is connected to a first input end of the comparison unit 121 (i.e., Figure 5 The other end of the second resistor R2 is connected to the first plate of the first capacitor C1, and the voltage dividing module 14 is used to provide a reference voltage VREF to the comparison unit 121.

[0068] In this example, a stable reference voltage VREF can be generated from the power supply voltage VCC through the voltage divider module 14, and the current flowing into the first input terminal of the comparison unit 121 can be limited through the voltage divider module 14 to prevent excessive current from damaging the comparison unit 121 and further affecting the comparison and detection of the comparison unit 121, thereby improving the comparison and detection reliability of the comparison unit 121.

[0069] Optional, such as Figure 5 As shown, the voltage divider module 14 may include a tenth resistor R10 and an eleventh resistor R11, one end of the tenth resistor R10 is connected to the power supply voltage VCC as the first end of the voltage divider module 14, and the other end of the tenth resistor R10 is connected to one end of the eleventh resistor R11 and is connected to the first input end of the comparison unit 121 (i.e., as shown in FIG. Figure 5The other end of the second resistor R2 is connected to the first plate of the first capacitor C1, and the other end of the eleventh resistor R11 is grounded as the second end of the voltage divider module 14.

[0070] Through the voltage divider module 14 composed of the tenth resistor R10 and the eleventh resistor R11, a stable reference voltage VREF can be generated from the power supply voltage VCC. By selecting different resistance values, the size of the reference voltage VREF can be flexibly adjusted to meet the needs of different application scenarios, and the adjustment flexibility is relatively high.

[0071] In one example, if Figure 6 As shown, each detection module 12 further includes an amplifying unit 122 , which is connected to the conversion module 11 and the second input end of the comparing unit 12 . The amplifying unit 122 is used to receive an electrical signal, amplify the electrical signal, and output it to the comparing unit 121 .

[0072] In this example, the amplification unit 122 will amplify the electrical signal, thereby enhancing the amplitude of the electrical signal so that it can be more easily detected by the subsequent comparison unit 121. By amplifying the electrical signal output by the conversion module 11, the sensitivity of the entire detection module 12 to small voltage changes can be improved to improve the overall detection accuracy of the detection module 12. Secondly, the amplification unit 122 can also effectively suppress common-mode noise, thereby improving the signal-to-noise ratio of the received electrical signal, so as to improve the reliability of the subsequent comparison unit 121 generating a detection signal based on the electrical signal, thereby improving the overall detection reliability of the detection module 12.

[0073] Optional, such as Figure 7 As shown, the amplification unit 122 includes an operational amplifier OP, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6, one end of the third resistor R3 is connected to one end of the conversion module 11, the other end of the third resistor R3 is connected to the non-inverting input terminal of the operational amplifier OP and one end of the fifth resistor R5, the other end of the fifth resistor R5 is grounded, one end of the fourth resistor R4 is connected to the other end of the conversion module 11, the other end of the fourth resistor R4 is connected to the inverting input terminal of the operational amplifier OP and one end of the sixth resistor R6, and the output end of the operational amplifier OP is connected to the second input terminal of the comparison unit 121 (i.e., the inverting input terminal of the comparator COMP) and the other end of the sixth resistor R6.

[0074] Among them, the two input ends of the operational amplifier OP are respectively connected to the two ends of the conversion module 11. It can be understood that the operational amplifier OP receives the voltage difference (i.e., the differential signal) at the two ends of the conversion module 11. The operational amplifier OP will amplify this voltage difference, thereby enhancing the amplitude of the electrical signal transmitted to the comparison unit 121, and improving the reliability of the subsequent comparison unit 121 generating a detection signal based on the electrical signal. Secondly, the operational amplifier OP, as a signal preprocessing unit, can adjust the electrical signal to a range suitable for the operation of the comparison unit 121. For example, assuming that the amplitude of the electrical signal is small, the operational amplifier OP can amplify it to the threshold range of the operational amplifier OP to improve the reliability of the electrical signal connected to the comparison unit 121, thereby improving the overall detection reliability of the detection module 12.

[0075] There will be a small bias current at the input end of the operational amplifier OP. In order to balance the influence of these bias currents, the two input ends of the operational amplifier OP are respectively provided with a third resistor R3 and a fourth resistor R4 to ensure that the voltage drops generated by the bias currents of the two input ends are equal, thereby reducing the influence of the bias current on the circuit performance. A fifth resistor R5 is provided between the in-phase input end of the operational amplifier OP and the output end of the operational amplifier OP, and a sixth resistor R6 is provided between the inverting input end of the operational amplifier OP and the output end of the operational amplifier OP, so that positive and negative feedback can be realized to improve the stability of the operational amplifier OP, reduce the gain error, and improve the amplification reliability of the operational amplifier OP.

[0076] In order to enable the conversion module 11 to convert the connection state of the low voltage detection connector 2 into a corresponding electrical signal, in one example, Figure 7 As shown, the conversion module 11 includes a seventh resistor R7, one end of the seventh resistor R7 is connected to one end of the third resistor R3 and the first end of the low voltage detection connector 2 as one end of the conversion module 11, and the other end of the seventh resistor R7 is connected to one end of the fourth resistor R4 and the second end of the low voltage detection connector 2 as the other end of the conversion module 11.

[0077] In this example, when the connection state of the low voltage detection connector 2 is a normal connection, the voltage difference across the seventh resistor R7 is 0V (volt), and the electrical signal output by the seventh resistor R7 is a low level signal; when the connection state of the low voltage detection connector 2 is an abnormal connection, there is a voltage difference across the seventh resistor R7, and the voltage difference is greater than 0V, and the electrical signal output by the seventh resistor R7 is a high level signal. In this way, by detecting the voltage difference across the seventh resistor R7, the connection state of the low voltage detection connector 2 connected thereto can be easily determined, and the seventh resistor R7 can autonomously convert the connection state of the low voltage detection connector 2, that is, the connection state of the low voltage detection connector 2 can be converted into a high and low level signal recognizable by the detection module 12 through the seventh resistor R7, so that the fault detection system 1 can realize autonomous detection based on the seventh resistor R7, without relying on the control of the microcontroller or other systems, and the detection flexibility is high.

[0078] Optionally, the seventh resistor R7 provided in the present application may be connected correspondingly to the low voltage detection connector 2 via the low voltage detection port.

[0079] In order to improve the reliability of the detection signal output by the comparator COMP, in one example, Figure 8 As shown, the fault detection system 1 further includes a plurality of twelfth resistors R12 and a plurality of second capacitors C2, the number of the plurality of twelfth resistors R12 and the plurality of second capacitors C2 being the same as the number of comparators COMP, that is, the output end of each comparator COMP is connected to one end of a twelfth resistor R12 and a first plate of a second capacitor C2, the other end of the twelfth resistor R12 is connected to the microcontroller 13, and the second plate of the second capacitor C2 is grounded. The second plates of the plurality of second capacitors C2 are connected to each other to be grounded.

[0080] In this example, the RC filter formed by the twelfth resistor R12 and the second capacitor C2 can filter out high-frequency noise, reduce the interference components in the detection signal output by the comparator COMP, and remove noise through the twelfth resistor R12 and the second capacitor C2, which can improve the signal-to-noise ratio, reduce electromagnetic interference, and make the detection signal easier to be received by the microcontroller 13. Secondly, the twelfth resistor R12 and the second capacitor C2 can also smooth the detection signal, reduce the fluctuation and jitter of the detection signal, and make the detection signal connected to the microcontroller 13 more stable. In this way, the twelfth resistor R12 and the second capacitor C2 are set between the comparator COMP and the microcontroller 13, which 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 reliability of the detection signal received by the microcontroller 13, and then ensuring the detection reliability of the fault detection system 1.

[0081] The specific implementation scheme of the high-voltage interlocking circuit can be classified into voltage source type and current source type according to the circuit excitation source. For example, please refer to Figures 2 to 8 , the high-voltage interlocking circuit adopts a voltage source type, the conversion module 11 and the low-voltage detection connector 2 are connected to the power supply voltage VCC, in order to reduce the energy consumption of the fault detection system 1, in an example, Fig. 9 As shown, the fault detection system 1 further includes a ninth resistor R9 and a second switch module 15, one end of the ninth resistor R9 is connected to the power supply voltage VCC, a first end of the second switch module 15 is connected to the other end of the ninth resistor R9, and a second end of the second switch module 15 is connected to a first conversion module 11 (such as Fig. 9 The first seventh resistor R7 of the plurality of seventh resistors R7 is connected, and the controlled end of the second switch module 15 is connected to the microcontroller 13.

[0082] In this example, when the fault detection system 1 is required to perform detection, the microcontroller 13 controls the second switch module 15 to be turned on, so that the power supply voltage VCC is loaded into the loop where the conversion module 11 is located, so that the fault detection system 1 can operate normally. When the fault detection system 1 is not required to perform detection, the microcontroller 13 controls the second switch module 15 to be turned off, so that the power supply voltage VCC is not loaded into the loop where the conversion module 11 is located, and the conversion module 11 and other modules do not work at this time. In this way, the microcontroller 13 can reduce the energy consumption of the fault detection system 1 and save a certain amount of energy by controlling the second switch module 15 to be turned off.

[0083] Optionally, the second switch module 15 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 transistor, a relay circuit or other devices or circuits that can achieve on-off functions, and the present application does not make any specific restrictions on this.

[0084] Optional, such as Fig.10 As shown, the second switch module 15 can be a PNP transistor, the emitter of the PNP transistor is connected to the other end of the ninth resistor R9, the base of the PNP transistor is connected to the microcontroller 13, and the collector of the PNP transistor is connected to the first conversion module 11 among the multiple conversion modules 11. In the on state, the saturation voltage drop of the PNP transistor is low, which helps to reduce the power loss and heat generation of the second switch module 15. The second switch module 15 can also use other switches, and this application does not make specific restrictions on this.

[0085] For example, please refer to Fig.11The high-voltage interlocking circuit adopts a current source type. The fault detection system 1 also includes an eighth resistor R8, a first switch module 16 and a current source CCS. One end of the second resistor R2 is connected to the microcontroller 13, a first end of the first switch module 16 is connected to the other end of the eighth resistor R8, a second end of the first switch module 16 is grounded, and a third end of the first switch module 16 is connected to a first conversion module 11 (such as Fig.11 The first seventh resistor R7 of the plurality of seventh resistors R7 is connected, one end of the current source CCS is connected to the fourth end of the first switch module 16, and the other end of the current source CCS is connected to the last conversion module 11 of the plurality of conversion modules 11 (such as Fig.11 The last seventh resistor R7) of the plurality of seventh resistors R7 shown is connected.

[0086] In this example, when the fault detection system 1 is required to perform detection, the microcontroller 13 controls the first switch module 16 to be turned on, and the loop formed between the first switch module 16 and the ground terminal is turned on, so that the current source CCS is loaded into the loop where the conversion module 11 is located, so that the conversion module 11 can operate normally. When the fault detection system 1 is not required to perform detection, the microcontroller 13 controls the first switch module 16 to be turned off, so that the current source CCS is not loaded into the loop where the conversion module 11 is located, and the conversion module 11 does not work at this time. In this way, the microcontroller 13 can reduce the energy consumption of the fault detection system 1 and save a certain amount of energy by controlling the second switch module 15 to be turned off.

[0087] Optional, such as Fig.11 As shown, the first switch module 16 can be a photoelectric coupler, the anode of the light emitting diode in the photoelectric coupler is connected to the other end of the eighth resistor R8, the cathode of the light emitting diode in the photoelectric coupler is grounded, the collector of the triode in the photoelectric coupler is connected to the current source CCS, and the emitter of the triode in the photoelectric coupler is connected to the first seventh resistor R7 among the plurality of seventh resistors R7. The microcontroller 13 can control the on-off of the triode by changing the current of the light emitting diode in the photoelectric coupler to realize the on-off control of the first switch module 16, which has high flexibility and fast response speed, and the light emitting diode only needs a small current to drive the light emission, and the power consumption is low. Secondly, the light emitting diode circuit and the triode circuit in the photoelectric coupler are electrically isolated, that is, there is no direct electrical connection between the microcontroller corresponding to the light emitting diode and the load circuit corresponding to the triode, which can effectively prevent the damage of the circuit by high voltage or large current, realize electrical isolation, and improve the service life and reliability of the fault detection system. The first switch module 16 can also select other circuits or devices that can realize isolation and switch functions, and this application does not make specific restrictions.

[0088] In summary, the conversion module 11 provided in the present application can convert the connection state of the low-voltage detection connector 2 into high and low level signals that can be recognized by the detection module 12, that is, the conversion module 11 can convert the connection state of the low-voltage detection connector 2 in real time, so that the detection module 12 can generate a corresponding detection signal based on the electrical signal converted by the conversion module 11 to achieve accurate detection. The detection module 12 will output the generated detection signal to the microcontroller 13, so that the microcontroller 13 can accurately know the on-off state of the high-voltage interlocking circuit and the specific fault location (that is, the abnormally connected low-voltage detection connector 2) based on the detection signal, 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 circuit, so that the staff 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 high-voltage interlocking system faults, and improving a certain degree of safety. Secondly, compared with the control system in the related art that needs to receive signals from different sub-control units for processing, the present application receives and processes detection signals from different detection modules 12 through the same microcontroller 13, which has a fast response speed, and receives multiple detection signals through the same microcontroller 13, and the synchronization of the received detection signals is high, so as to ensure the real-time detection and detection accuracy of the microcontroller 13. In addition, there is no need to set up additional sub-control units in the high-voltage interlock detection system 1, which saves manufacturing costs and simplifies the system structure.

[0089] The vehicle of the embodiment of the present application may be an electric vehicle, that is, a vehicle that uses electric energy as a power source and drives the wheels through an electric motor. Electric vehicles include but are not limited to pure electric vehicles (Battery Electric Vehicle, BEV), plug-in hybrid electric vehicles (Plug-in Hybrid Electric Vehicle, PHEV), hybrid electric vehicles (Hybrid Electric Vehicle, HEV), extended-range electric vehicles (Extended-Range Electric Vehicle, EREV), etc. In this regard, the present application does not make specific restrictions.

[0090] The vehicle provided in the embodiment of the present application has the fault detection system 1 of the above embodiment, and therefore has all the beneficial effects of the above fault detection system 1, which will not be described in detail.

[0091] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0092] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0093] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A fault detection system, applied to a high voltage interlocking circuit having a plurality of low voltage detection connectors, characterized in that: The fault detection system comprises: A plurality of conversion modules, the plurality of conversion modules are sequentially connected in series and are respectively connected to the plurality of low-voltage detection connectors in a one-to-one correspondence, and each of the conversion modules can output a corresponding electrical signal based on the connection state of the low-voltage detection connector; a plurality of detection modules, each of which is connected to each of the conversion modules in a one-to-one correspondence, and each of which receives the electrical signal and outputs a corresponding detection signal based on the electrical signal; and A microcontroller, wherein the microcontroller is connected to the plurality of detection modules to receive the detection signals from the plurality of detection modules, and the microcontroller is used to determine the on / off state of the high-voltage interlock circuit and the connection state of the plurality of low-voltage detection connectors based on the plurality of detection signals.

2. The fault detection system according to claim 1, characterized in that: Each of the detection modules comprises: A comparison unit, wherein a first input terminal of the comparison unit is connected to a reference voltage, a second input terminal of the comparison unit is connected to the conversion module, an output terminal of the comparison unit is connected to the microcontroller, and the comparison unit is used to generate the detection signal based on the reference voltage and the electrical signal, and send the detection signal to the microcontroller.

3. The fault detection system according to claim 2, characterized in that: The comparison unit includes a comparator, a first resistor, a second resistor and a first capacitor; The inverting input terminal of the comparator is connected to the conversion module, the non-inverting input terminal of the comparator is connected to one end of the first resistor and one end of the second resistor, the output terminal of the comparator is connected to the other end of the first resistor and the microcontroller, the other end of the second resistor is connected to the first plate of the first capacitor and is connected to the reference voltage, and the second plate of the first capacitor is grounded.

4. The fault detection system according to claim 2, characterized in that: The fault detection system also includes: A voltage divider module, wherein the first end of the voltage divider module is connected to the power supply voltage, the second end of the voltage divider module is grounded, the third end of the voltage divider module is connected to the first input end of the comparison unit, and the voltage divider module is used to provide the reference voltage to the comparison unit.

5. The fault detection system according to claim 2, characterized in that: Each of the detection modules further comprises: an amplifying unit, wherein the amplifying unit is connected to the conversion module and the second input end of the comparing unit, and the amplifying unit is used to receive the electrical signal, amplify the electrical signal, and output the amplified signal to the comparing unit.

6. The fault detection system according to claim 5, characterized in that: The amplifying unit includes an operational amplifier, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor; One end of the third resistor is connected to one end of the conversion module, the other end of the third resistor is connected to the non-inverting input terminal of the operational amplifier and one end of the fifth resistor, the other end of the fifth resistor is grounded, one end of the fourth resistor is connected to the other end of the conversion module, the other end of the fourth resistor is connected to the inverting input terminal of the operational amplifier and one end of the sixth resistor, and the output end of the operational amplifier is connected to the second input terminal of the comparison unit and the other end of the sixth resistor.

7. The fault detection system according to claim 6, characterized in that: The conversion module comprises: A seventh resistor, one end of the seventh resistor serving as one end of the conversion module connected to one end of the third resistor and a first end of the low voltage detection connector, and the other end of the seventh resistor serving as the other end of the conversion module connected to one end of the fourth resistor and a second end of the low voltage detection connector.

8. The fault detection system according to any one of claims 1 to 7, characterized in that: The fault detection system also includes: an eighth resistor, one end of which is connected to the microcontroller; a first switch module, wherein a first end of the first switch module is connected to the other end of the eighth 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 conversion module among the plurality of conversion modules; and A current source, one end of which is connected to the fourth end of the first switch module, and the other end of which is connected to the last conversion module among the multiple conversion modules.

9. The fault detection system according to any one of claims 1 to 7, characterized in that: The fault detection system also includes: a ninth resistor, one end of which is connected to a power supply voltage; and A second switch module, wherein a first end of the second switch module is connected to the other end of the ninth resistor, a second end of the second switch module is connected to the first conversion module among the plurality of conversion modules, and a controlled end of the second switch module is connected to the microcontroller.

10. A vehicle, characterized in that: The vehicle comprises: A high voltage interlock circuit, wherein the high voltage interlock circuit is provided with a plurality of low voltage detection connectors; A fault detection system as claimed in any one of claims 1 to 9, wherein the fault detection system is connected to a plurality of the low voltage detection connectors.

Images