Detection circuit and vehicle

Abstract

The invention provides a detection circuit and a vehicle, the detection circuit is applied to the vehicle with a high-voltage interlocking loop with a low-voltage detection connector and a control module, and the detection circuit comprises a sampling module and a first switch module. The first end of the sampling module is connected with the first end of the low-voltage detection connector, the second end of the sampling module is connected with the second end of the low-voltage detection connector, and the sampling module is used for generating a sampling signal; the first end of the first switch module is connected with the first end of the sampling module, the controlled end of the first switch module is connected with the second end of the sampling module, the second end of the first switch module is connected with the control module, and the first switch module receives the sampling signal and outputs a detection signal according to the sampling signal. And the control module determines the working state of the low-voltage detection connector based on the detection 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] The present application relates to the field of vehicle electronic technology, and in particular to a detection circuit and a vehicle. Background Art

[0002] High-voltage connectors are important components that connect 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 power batteries and high-voltage components in the vehicle system (such as electric motors, etc.), which is used to efficiently transmit the high-voltage electrical energy of the power battery to the high-voltage components.

[0003] In order to monitor the connection status of high-voltage circuits such as vehicle charging and discharging in real time, identify abnormal disconnection or damage of high-voltage circuits, and disconnect high-voltage electricity in time to ensure safety, a high-voltage interlocking system is proposed in the relevant technology. The high-voltage interlocking system includes a high-voltage interlocking circuit composed of electrical equipment such as low-voltage detection connectors and low-voltage detection circuits.

[0004] Among them, the low-voltage detection connector is usually integrated inside the high-voltage connector. In other words, the high-voltage connector includes high-voltage terminals and low-voltage detection connectors. During the use of the high-voltage connector, if the high-voltage terminals and the low-voltage detection connector are plugged in or unplugged correctly, the high-voltage interlock circuit and the high-voltage circuit will be connected or disconnected in sequence, thereby preventing the high-voltage connector from being plugged in or unplugged under power, effectively avoiding damage to the high-voltage terminals.

[0005] When the low-voltage detection connectors, low-voltage detection circuits and other electronic components of the high-voltage interlocking circuit fail due to wear, aging and other reasons, the high-voltage interlocking circuit will be disconnected. At the same time, the high-voltage interlocking system fault alarm will be issued and the high-voltage circuit will be disconnected. In this way, the high-voltage power supply can be cut off in time to avoid the risk of electric shock or fire accidents and protect the safety of personnel and vehicles.

[0006] At present, when a high-voltage interlocking system fault alarm sounds, it is difficult to accurately determine the specific location where the high-voltage interlocking circuit is disconnected, resulting in low efficiency in troubleshooting the high-voltage interlocking system fault. Summary of the invention

[0007] The present application provides a detection circuit and a vehicle, which can solve the problem of low efficiency in troubleshooting high-voltage interlocking system faults.

[0008] In a first aspect, the present application provides a detection circuit, which is applied to a vehicle, wherein the vehicle includes a high-voltage interlocking circuit having a low-voltage detection connector and a control module, wherein the detection circuit includes:

[0009] A sampling module, wherein a first end of the sampling module is connected to a first end of the low voltage detection connector, a second end of the sampling module is connected to a second end of the low voltage detection connector, and the sampling module is used to generate a sampling signal;

[0010] A first switch module, wherein the first end of the first switch module is connected to the first end of the sampling module, the controlled end of the first switch module is connected to the second end of the sampling module, the second end of the first switch module is connected to the control module, the first switch module receives the sampling signal and outputs a detection signal according to the sampling signal, so that the control module can determine the working state of the low-voltage detection connector based on the detection signal.

[0011] In the solution provided by the embodiment of the present application, the sampling module of the detection circuit generates corresponding different sampling signals based on the different working states of the low-voltage detection connector of the vehicle, so that the first switch module is disconnected or turned on. When the first switch module is turned on, the detection signal output by the first switch module is transmitted to the control module of the vehicle, and the control module can determine that the low-voltage detection connector is abnormally connected based on the detection signal. Based on this, when the high-voltage interlocking system fails and alarms, if the control module obtains a detection signal reflecting the abnormality of the low-voltage detection connector, the staff can accurately determine the fault of the low-voltage detection connector, quickly repair or replace the low-voltage detection connector, and efficiently eliminate the high-voltage interlocking system fault. It can be seen that the present application can effectively solve the problem of low efficiency in eliminating high-voltage interlocking system faults.

[0012] In combination with the first aspect, in some possible implementations, the sampling module includes a sampling resistor, one end of the sampling resistor is connected to the first end of the low voltage detection connector and is connected to the power supply voltage, and the other end of the sampling resistor is connected to the second end of the low voltage detection connector.

[0013] In the embodiment of the present application, the connection state of the low-voltage detection connector corresponds to the voltage value at both ends of the sampling resistor. When the low-voltage detection connector is connected normally, the voltage at both ends of the sampling resistor short-circuited by the low-voltage detection connector is 0, and the first switch module cannot be turned on. The first switch module is in a disconnected state and outputs a low-level detection signal. When the low-voltage detection connector is abnormally connected, the low-voltage detection connector no longer short-circuits the sampling resistor, the sampling resistor divides the power supply voltage, and the voltage at both ends of the sampling resistor can make the first switch module in a conductive state and output a high-level detection signal. Therefore, the control module can determine that the low-voltage detection connector is abnormally connected based on the high-level detection signal. In addition, sampling through the sampling resistor, on the one hand, the circuit structure is relatively simple, easy to integrate, convenient for circuit design and implementation, suitable for large-scale production, on the other hand, the cost and power consumption of the sampling resistor are low, which is conducive to reducing the manufacturing and use costs of the detection circuit.

[0014] In combination with the first aspect and the above implementation manner, in order to control the sampling module and reduce the energy consumption of the sampling module, in some possible implementation manners, the detection circuit further includes:

[0015] A second switch module, wherein a first end of the second switch module is connected to the power supply voltage, a second end of the second switch module is connected to one end of the sampling resistor, and a controlled end of the second switch module is connected to the control module.

[0016] When the solution of the embodiment of the present application is in use, the control module can send a control signal to the second switch module as needed or according to a certain time period to control the second switch module to be turned on. At this time, the power supply voltage connected to the first end of the second switch module can be output to the sampling module through the second switch module, so that the sampling module can be powered on and work. When the second switch module is turned off, the sampling module is powered off and stops working, and the sampling resistor of the sampling module no longer consumes energy. Therefore, controlling the sampling module by the second switch module in a predetermined time period can effectively save energy.

[0017] In combination with the first aspect and the above implementation manner, in some possible implementation manners, the detection circuit further includes:

[0018] An isolation module, wherein a first end of the isolation module is connected to the control module, and a second end of the isolation module is connected to a controlled end of the second switch module.

[0019] In the embodiment of the present application, the input and output ends of the isolation module are effectively electrically isolated, the output signal has no effect on the input end, and has the advantages of strong anti-interference ability and stable operation. In this way, the interference received by the control module when sending the control signal to the second switch module can be reduced, the reliability of the control signal transmission can be improved, and thus the reliability of the control module controlling the sampling module can be improved.

[0020] In combination with the first aspect and the above implementation manner, in some possible implementation manners, the detection circuit further includes a constant current source;

[0021] The sampling module includes a sampling resistor, one end of which is connected to the first end of the low voltage detection connector and one end of the constant current source, and the other end of which is connected to the second end of the low voltage detection connector and the other end of the constant current source.

[0022] In an embodiment of the present application, the connection state of the low-voltage detection connector corresponds to the voltage value across the sampling resistor. When the low-voltage detection connector is connected normally, the sampling resistor is short-circuited by the low-voltage detection connector, the constant current output by the constant current source does not pass through the sampling resistor, and the voltage across the sampling resistor is 0. In this case, the first switch module cannot be turned on, the first switch module is in a disconnected state and outputs a low-level detection signal. When the low-voltage detection connector is abnormally connected, the low-voltage detection connector no longer short-circuits the sampling resistor, the constant current output by the constant current source passes through the sampling resistor, and the voltage across the sampling resistor is not 0. In this case, the first switch module can be turned on, the first switch module is in a conducting state and outputs a high-level detection signal. Therefore, the control module can determine that the low-voltage detection connector is connected normally based on the low-level detection signal, and can determine that the low-voltage detection connector is abnormally connected based on the high-level detection signal.

[0023] The embodiment of the present application generates a sampling signal on the sampling resistor through a constant current source. Since the constant current source can provide a stable and accurate current output, a stable sampling signal can be generated at both ends of the sampling resistor when the low-voltage detection connector is abnormally connected, so that the first switch module is in a stable conduction state, thereby improving the working reliability of the detection circuit.

[0024] In combination with the first aspect and the above implementation manner, in some possible implementation manners, the detection circuit further includes:

[0025] A third switch module, wherein a first end of the third switch module is connected to the control module, a second end of the third switch module is connected to one end of the constant current source, a third end of the third switch module is connected to one end of the sampling resistor, and a fourth end of the third switch module is grounded.

[0026] When the solution of the embodiment of the present application is used, the control module can send a control signal to the third switch module as needed or according to a certain time period to control the third switch module to be turned on, thereby controlling the sampling module to be powered on. When the third switch module is turned off, the sampling module is powered off and stops working, and the sampling resistor of the sampling module no longer consumes energy. Therefore, energy can be effectively saved by controlling the sampling module to be powered off and stopped working by the third switch module in a predetermined time period.

[0027] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the number of the low-voltage detection connectors is multiple, and the number of the sampling modules and the first switch modules are respectively multiple; the multiple low-voltage detection connectors, the multiple sampling modules and the multiple first switch modules are connected one-to-one.

[0028] In the embodiment of the present application, a sampling module and a first switch module are provided for each low-voltage detection connector, so that the detection of multiple low-voltage detection connectors can be realized. When a low-voltage detection connector fails, the control module can promptly determine the abnormal connection of the low-voltage detection connector through the sampling module and the first switch module connected to the low-voltage detection connector, and promptly repair or replace the low-voltage detection connector, thereby effectively eliminating the failure of the high-voltage interlocking system.

[0029] In combination with the first aspect and the above implementation manner, in some possible implementation manners, the detection circuit further includes:

[0030] A pull-down resistor, wherein a first end of the pull-down resistor is connected to a second end of the first switch module, and a second end of the pull-down resistor is grounded.

[0031] The embodiment of the present application can output the ground terminal signal of the first switch module to the ground by setting a pull-down resistor. When the first switch module is cut off, the pull-down resistor can provide a fixed level, that is, 0 level, for the ground terminal of the first switch module. In addition, since the current always tends to flow to the line with smaller resistance, and the resistance value of the pull-down resistor is smaller, the electrostatic discharge current can be output to the ground along the line where the pull-down resistor is located by setting the pull-down resistor, thereby preventing the ground terminal of the first switch module from being damaged by electrostatic interference and improving the anti-static ability of the first switch module.

[0032] In combination with the first aspect and the above implementation manner, in some possible implementation manners, the detection circuit further includes:

[0033] A filter resistor and a filter capacitor, wherein the first end of the filter resistor is connected to the first plate of the filter capacitor and the second end of the first switch module, the second end of the filter resistor is connected to the control module, and the second plate of the filter capacitor is grounded.

[0034] In an embodiment of the present application, a filter resistor and a filter capacitor can constitute an electronic filter. The electronic filter can filter the detection signal of the input control module and reduce the interference of noise signals on the detection signal by utilizing the different responses of the filter resistor and the filter capacitor to signals of different frequencies.

[0035] In a second aspect, the present application further provides a vehicle, comprising:

[0036] High voltage interlock circuit with low voltage detection connector;

[0037] a control module; and

[0038] The detection circuit described in any one of the first aspects above, wherein the detection circuit is connected to the low voltage detection connector and the control module.

[0039] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the embodiments below. The accompanying drawings are only for the purpose of illustrating the embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0041] Figure 1 It is a schematic diagram of a framework of a detection circuit provided in an embodiment of the present application;

[0042] Figure 2 yes Figure 1 The first circuit diagram of the detection circuit;

[0043] Figure 3 yes Figure 1 A second circuit diagram of the detection circuit;

[0044] Figure 4 yes Figure 1 The third circuit diagram of the detection circuit;

[0045] Figure 5 yes Figure 1 The fourth circuit diagram of the detection circuit;

[0046] Figure 6 yes Figure 1 The fifth circuit diagram of the detection circuit;

[0047] Figure 7 yes Figure 1 The sixth circuit diagram of the detection circuit.

[0048] The description of the reference numerals in the figures is as follows:

[0049] 1—Detection circuit;

[0050] 100—sampling module; R1—sampling resistor;

[0051] 200—first switch module;

[0052] 400—second switch module;

[0053] 500—Isolation module;

[0054] 600—third switch module;

[0055] VCC—power supply voltage; CCS—constant current source;

[0056] R2—pull-down resistor;

[0057] C—filter capacitor; R3—filter resistor;

[0058] 2—Low voltage detection connector;

[0059] 3—Control module. DETAILED DESCRIPTION

[0060] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0062] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0063] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0064] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0065] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0066] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0067] High-voltage connectors are important components that connect 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 high-voltage batteries (such as power batteries) and high-voltage components in the vehicle system (such as electric motors, etc.), which is used to efficiently transmit the high-voltage electrical energy of the power battery to the high-voltage components.

[0068] In order to monitor the connection status of high-voltage circuits such as vehicle charging and discharging in real time, identify abnormal disconnection or damage of high-voltage circuits, and disconnect high-voltage electricity in time to ensure safety, a high-voltage interlocking system is proposed in the relevant technology. The high-voltage interlocking system includes a high-voltage interlocking circuit composed of electrical equipment such as low-voltage detection connectors and low-voltage detection circuits.

[0069] Among them, the low-voltage detection connector is usually integrated inside the high-voltage connector. In other words, the high-voltage connector includes high-voltage terminals and low-voltage detection connectors. During the use of the high-voltage connector, if the high-voltage terminals and the low-voltage detection connector are plugged in or unplugged correctly, the high-voltage interlock circuit and the high-voltage circuit will be connected or disconnected in sequence, thereby preventing the high-voltage connector from being plugged in or unplugged under power, effectively avoiding damage to the high-voltage terminals.

[0070] When the low-voltage detection connectors, low-voltage detection circuits and other electronic components of the high-voltage interlocking circuit fail due to wear, aging and other reasons, the high-voltage interlocking circuit will be disconnected. At the same time, the high-voltage interlocking system fault alarm will be issued and the high-voltage circuit will be disconnected. In this way, the high-voltage power supply can be cut off in time to avoid the risk of electric shock or fire accidents and protect the safety of personnel and vehicles.

[0071] At present, when a high-voltage interlocking system fault alarm sounds, it is difficult to accurately determine the specific location where the high-voltage interlocking circuit is disconnected, resulting in low efficiency in troubleshooting the high-voltage interlocking system fault.

[0072] In order to solve the above technical problems, the present application provides a detection circuit and a vehicle. The following is a detailed introduction of a detection circuit and a vehicle provided in the present application with reference to the accompanying drawings.

[0073] The present application embodiment provides a vehicle, see Figure 1 The vehicle includes a high-voltage interlocking circuit with a low-voltage detection connector 2, a control module, and a detection circuit 1.

[0074] The vehicle of the embodiment of the present application can 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 (BEV, Battery Electric Vehicle), plug-in hybrid electric vehicles (PHEV, Plug-in Hybrid Electric Vehicle), hybrid electric vehicles (HEV, Hybrid Electric Vehicle), extended-range vehicles (EREV, Extended-Range Electric Vehicle), etc. Among them, pure electric vehicles rely entirely on the electric energy stored in the battery to drive the electric motor to achieve the power output of the vehicle. Plug-in hybrid vehicles combine electric motors and internal combustion engines. The electric motor can drive the vehicle alone or work with the internal combustion engine, and the battery can be charged by an external power supply. Hybrid vehicles are equipped with both electric motors and internal combustion engines. The electric motor assists the internal combustion engine in working, but cannot drive the vehicle alone. Extended-range vehicles are mainly driven by electric motors, and the internal combustion engine acts as a generator to charge the battery and does not directly drive the wheels.

[0075] The high voltage interlock loop (HVIL) is used in the high voltage system of electric vehicles. It monitors the integrity and continuity of the high voltage circuit through low voltage signals to ensure that the high voltage power can be disconnected in time when the high voltage circuit is abnormally disconnected or damaged, thereby ensuring the safety of personnel and equipment. The low voltage detection connector 2 is an important part of the high voltage interlock loop. It can monitor the connection status of the high voltage system to ensure the high voltage safety of electric vehicles, prevent accidental disconnection and misoperation, and thus protect the safety of personnel and equipment.

[0076] The control module 3 can be a vehicle control unit (VCU) or a microcontroller unit (MCU) of a battery management system (BMS). The vehicle control unit is one of the important components of an electric vehicle. Its function is to be solidified into the central processor of the vehicle control unit through a compiled program. The vehicle control unit with a control strategy program controls and manages the engine system, motor system, transmission system, vehicle power system, instrument display device, etc. according to the driver's instructions and the dynamic operation data of the vehicle, so that the various assemblies can be coordinated and controlled to realize the intelligent operation of the vehicle. The battery management system is used to intelligently manage and maintain each battery unit, prevent the battery from being overcharged and over-discharged, extend the battery's service life, and monitor the battery status. The microcontroller unit is a microcomputer chip that integrates a processor, a memory, and an input / output interface, and has the characteristics of low power consumption, small size, rich interfaces, and programmability.

[0077] Please refer to Figure 1 and Figure 2 The detection circuit 1 includes a sampling module 100 and a first switch module 200. The first end of the sampling module 100 is connected to the first end of the low voltage detection connector 2, and the second end of the sampling module 100 is connected to the second end of the low voltage detection connector 2. The sampling module 100 is used to generate a sampling signal; the first end of the first switch module 200 is connected to the first end of the sampling module 100, the controlled end of the first switch module 200 is connected to the second end of the sampling module 100, and the second end of the first switch module 200 is connected to the control module 3. The first switch module 200 receives the sampling signal and outputs a detection signal according to the sampling signal, so that the control module 3 can determine the working state of the low voltage detection connector 2 based on the detection signal.

[0078] The first switch module 200 may be a bipolar junction transistor (BJT), a metal oxide semiconductor (MOS) field effect transistor, an insulated gate bipolar transistor (IGBT), or other devices or circuits capable of realizing switching functions.

[0079] Among them, the full name of the triode is a semiconductor triode, also known as a bipolar transistor, a crystal triode, and is a semiconductor device that controls current. When the first switch module 200 uses a triode, it can amplify the weak signal in the circuit into an electrical signal with a larger amplitude value, so that the first switch module 200 can provide a higher power gain, and the triode also has the advantages of small on-resistance, low power consumption, and small size. The triode can use a switch transistor (Switch transistor) with the function of breaking and connecting. Compared with ordinary triodes, the switch triode has the advantages of longer service life, higher safety and reliability, no mechanical wear, fast switching speed, and small size. When the first switch module 200 uses a switch triode, the response speed is faster, so that the control module 3 can receive the detection signal output by it in time. MOS tube is a kind of field effect tube, which uses the electric field effect of the control input loop to control the output loop current. Optionally, the first switch module 200 can use N-type metal oxide semiconductor (N-Metal Oxide Semiconductor, NMOS) field effect transistor, or P-Metal Oxide Semiconductor (P-Metal Oxide Semiconductor, PMOS) field effect transistor. When the first switch module 200 uses MOS tube, it has the advantages of high input resistance, low noise, and low power consumption. IGBT insulated gate bipolar transistor is a composite fully controlled voltage-driven power semiconductor device composed of BJT (bipolar transistor) and MOS (insulated gate field effect transistor). Optionally, the first switch module 200 can use IGBT. When the first switch module 200 uses IGBT, efficient switching operation can be achieved through gate voltage control. Since IGBT combines the advantages of both triode and MOS tube, it not only has a small on-resistance but also has low power consumption due to voltage control. Therefore, when the first switch module 200 adopts IGBT, it not only has low power consumption and high on-off flexibility but also is easy to operate.

[0080] For example, see Figure 2 The first switch module 200 uses a PMOS tube, the source of the PMOS tube is connected to the first end of the sampling module 100, the gate of the PMOS tube is connected to the second end of the sampling module 100, and the drain of the PMOS tube is connected to the control module 3. Figures 2 to 4 As shown, the detection signal may be a constant voltage signal or other types of voltage signals, such as a triangular wave voltage signal, a sawtooth wave voltage signal, etc.

[0081] It should be noted that the sampling module 100 generates two different sampling signals based on the working states of the normal and abnormal connection of the low-voltage detection connector 2, one of which can disconnect the first switch module 200, and the other sampling signal can connect the first switch module 200; when the first switch module 200 is disconnected, the detection signal output by the first switch module 200 is transmitted to the control module 3, and the control module 3 can determine that the low-voltage detection connector 2 is connected normally based on the detection signal. When the first switch module 200 is connected, the detection signal output by the first switch module 200 is transmitted to the control module 3, and the control module 3 can determine that the low-voltage detection connector 2 is connected abnormally based on the detection signal.

[0082] In the solution provided by the embodiment of the present application, the sampling module 100 of the detection circuit 1 generates corresponding different sampling signals based on the different working states of the low-voltage detection connector 2, so that the first switch module 200 is disconnected or turned on. When the first switch module 200 is turned on, the detection signal output by the first switch module 200 is transmitted to the control module 3 of the vehicle, and the control module 3 can determine that the low-voltage detection connector 2 is abnormally connected based on the detection signal. Based on this, when the high-voltage interlocking system fails and alarms, if the control module 3 obtains a detection signal reflecting the abnormality of the low-voltage detection connector 2, the staff can accurately determine that the low-voltage detection connector 2 is faulty, quickly repair or replace the low-voltage detection connector 2, and efficiently eliminate the high-voltage interlocking system fault. It can be seen that the present application can effectively solve the problem of low efficiency in eliminating high-voltage interlocking system faults.

[0083] The following combination Figures 2 to 7 The specific structure of the detection circuit 1 provided in this application is introduced in detail. Figures 2 to 4 In some embodiments, the sampling module 100 may include a sampling resistor R1, one end of the sampling resistor R1 is connected to the first end of the low voltage detection connector 2 and is connected to the power supply voltage VCC, and the other end of the sampling resistor R1 is connected to the second end of the low voltage detection connector 2.

[0084] It should be noted that sampling through the sampling resistor R1, on the one hand, has a relatively simple circuit structure, is easy to integrate, facilitates circuit design and implementation, and is suitable for large-scale production; on the other hand, the cost and power consumption of the sampling resistor are low, which is conducive to reducing the manufacturing and use costs of the detection circuit.

[0085] Among them, one end of the sampling resistor R1 is connected to the power supply voltage VCC, so that the sampling resistor R1 can work normally. At this time, an additional power module can be added to the vehicle to provide the power supply voltage for the sampling resistor R1, or the power modules of other modules in the vehicle can be reused. The specific settings can be made according to actual needs. For example, if you want to improve the power supply reliability of the sampling resistor R1, you can add an additional power module to the vehicle to provide the power supply voltage for the sampling resistor R1; if you want to save manufacturing costs, you can reuse the power modules of other modules in the vehicle, that is, the sampling resistor R1 is connected to the original power module in the vehicle to access the power supply voltage. This application does not make specific restrictions on this.

[0086] When the low voltage detection connector 2 is connected normally, the sampling resistor R1 is short-circuited by the low voltage detection connector 2, so the voltage across the sampling resistor R1 is 0, that is, the voltage between the first end and the second end of the first switch module 200 is 0, and the first switch module 200 is in a disconnected state. The detection signal output by the first switch module 200 in the disconnected state is a low level signal. Therefore, when the detection signal received by the control module 3 is a low level signal, it can be determined that the low voltage detection connector 2 is connected normally.

[0087] When the low voltage detection connector 2 is abnormally connected, the two ends of the sampling resistor R1 divide the power supply voltage VCC, and the voltage across the sampling resistor R1 is not 0, that is, the voltage between the first end and the second end of the first switch module 200 is not 0. Selecting a power supply voltage VCC with a suitable voltage value and a sampling resistor R1 with a suitable resistance value can change the voltage value generated across the sampling resistor R1 accordingly, so as to drive the first switch module 200 to be in the on state. The detection signal output by the first switch module 200 in the on state is a high-level signal. Therefore, when the detection signal received by the control module 3 is a high-level signal, it can be determined that the low voltage detection connector 2 is abnormally connected.

[0088] In the embodiment of the present application, the connection state of the low voltage detection connector 2 corresponds to the voltage value across the sampling resistor R1. That is, when the low voltage detection connector 2 is connected normally, the voltage across the sampling resistor R1 short-circuited by the low voltage detection connector 2 is 0, and the first switch module 200 cannot be turned on. The first switch module 200 is in a disconnected state and outputs a low-level detection signal. When the low voltage detection connector 2 is abnormally connected, the low voltage detection connector 2 no longer short-circuits the sampling resistor R1, and the sampling resistor R1 divides the power supply voltage VCC. The voltage across the sampling resistor R1 can make the first switch module 200 in a conductive state and output a high-level detection signal. Therefore, the control module 3 can determine that the low voltage detection connector 2 is connected normally based on the low-level detection signal, and can determine that the low voltage detection connector 2 is abnormally connected based on the high-level detection signal.

[0089] See also Figure 3 and Figure 4 In order to control the sampling module 100 and reduce the energy consumption of the sampling module 100, in some embodiments, the detection circuit 1 may further include a second switch module 400, a first end of the second switch module 400 is connected to the power supply voltage VCC, a second end of the second switch module 400 is connected to one end of the sampling resistor R1, and a controlled end of the second switch module 400 is connected to the control module 3.

[0090] Optionally, the second switch module 400 may be a BJT, an N-type metal oxide semiconductor field effect transistor, a P-type metal oxide semiconductor field effect transistor, an insulated gate bipolar transistor, or other device or circuit capable of realizing the on-off function, which is not specifically limited in the present embodiment of the application. For example, Figure 3 As shown, the second switch module 400 can use a PNP transistor, the emitter of the PNP transistor is connected to the power supply voltage VCC, the collector of the PNP transistor is connected to one end of the sampling resistor R1, and the base of the PNP transistor is connected to the control module 3.

[0091] When in use, the control module 3 can send a control signal to the second switch module 400 as needed or according to a certain time period to control the second switch module 400 to be turned on. For example, the control signal can be sent to the second switch module 400 at intervals of 50ms, 100ms, 200ms, 250ms, etc. At this time, the power supply voltage VCC connected to the first end of the second switch module 400 can be output to the sampling module 100 through the second switch module 400, so that the sampling module 100 can be powered on and work. When the second switch module 400 is turned off, the sampling module 100 is powered off and stops working, and the sampling resistor R1 of the sampling module 100 no longer consumes energy. Therefore, by controlling the sampling module 100 through the second switch module 400 in a predetermined time period, power consumption can be effectively reduced and energy can be saved.

[0092] See also Figure 3 and Figure 4 In some embodiments, the detection circuit 1 may further include an isolation module 500, wherein the first end of the isolation module 500 is connected to the control module 3, and the second end of the isolation module 500 is connected to the controlled end of the second switch module 400. In the embodiment of the present application, by providing the isolation module 500, effective electrical isolation is achieved between the control module 3 and the second switch module 400, that is, the output signal has no effect on the input end. In this way, the interference received when the control module 3 sends a control signal to the second switch module 400 can be reduced, and the reliability of the control signal transmission can be improved, thereby improving the reliability of the control module 3 controlling the sampling module 100.

[0093] The isolation module 500 may be an optical coupler isolator. Figure 3As shown, the first end of the optocoupler isolator is connected to the control module 3, the second end of the optocoupler isolator is connected to the controlled end of the second switch module 400, and the third and fourth ends of the optocoupler isolator are grounded. The optocoupler isolator is a device that uses light as a medium to transmit electrical signals. Usually, the light emitter and the light receiver are packaged in the same tube shell. When an electrical signal is applied to the input end, the light emitter emits light, and the light receiver generates a photocurrent after receiving the light, which flows out from the output end, thereby realizing "electric-light-electric" control. The light emitter of the photocoupler can be a light-emitting diode, and the light receiver can be a photosensitive semiconductor tube, a photoresistor, etc. When the light-emitting diode is turned on and emits light, the photosensitive semiconductor tube can be turned on, thereby turning on the output circuit and outputting a control signal. Optocoupler isolators have the advantages of electrical isolation, high insulation strength, strong anti-interference ability, low power consumption, fast response speed, etc. When the isolation module 500 adopts an optocoupler isolator, the branch where it is located has a fast response speed and strong anti-interference ability, effectively realizing electrical isolation, and improving the transmission reliability of the control signal output from the control module 3 to the second switch module 400, so as to improve the control reliability of the control module 3. The isolation module 500 can also adopt other devices or circuits that can achieve the above-mentioned isolation effect, and this application does not make specific restrictions on this.

[0094] See also Figure 5 In some embodiments, the detection circuit 1 may further include a constant current source CCS; the sampling module 100 may include a sampling resistor R1, one end of the sampling resistor R1 is connected to the first end of the low voltage detection connector 2 and one end of the constant current source CCS, and the other end of the sampling resistor R1 is connected to the second end of the low voltage detection connector 2 and the other end of the constant current source CCS.

[0095] Among them, the constant current source CCS is used to output a constant current, and the output current will not change with the change of the load. The constant current source CCS can provide high-precision current output, is suitable for long-term stable operation, and is not easily affected by external factors.

[0096] It can be understood that when the current of the constant current source CCS passes through the resistor, a voltage can be generated at both ends of the resistor. Therefore, when the low voltage detection connector 2 is connected normally, the sampling resistor R1 is short-circuited by the low voltage detection connector 2, so the constant current output by the constant current source CCS does not pass through the sampling resistor R1, and the voltage across the sampling resistor R1 is 0, that is, the voltage between the first end and the second end of the first switch module 200 is 0, and the first switch module 200 is in the disconnected state. The detection signal output by the first switch module 200 in the disconnected state is a low level signal. Therefore, when the control module 3 receives a low level signal, it can be determined that the low voltage detection connector 2 is connected normally.

[0097] When the low voltage detection connector 2 is abnormally connected, the sampling resistor R1 is no longer short-circuited by the low voltage detection connector 2, and the constant current output by the current source CCS passes through the sampling resistor R1. The voltage across the sampling resistor R1 is not 0, that is, the voltage between the first end and the second end of the first switch module 200 is not 0. Selecting a constant current source CCS with a suitable current value and a sampling resistor R1 with a suitable resistance value can make the voltage generated across the sampling resistor R1 drive the first switch module 200 to be in a conducting state. The detection signal output by the first switch module 200 in the conducting state is a high-level signal. Therefore, when the control module 3 receives a high-level signal, it can be determined that the low voltage detection connector 2 is abnormally connected.

[0098] In the embodiment of the present application, the connection state of the low voltage detection connector 2 corresponds to the voltage value across the sampling resistor R1. When the low voltage detection connector 2 is connected normally, the sampling resistor R1 is short-circuited by the low voltage detection connector 2, the constant current output by the constant current source CCS does not pass through the sampling resistor R1, and the voltage across the sampling resistor R1 is 0. In this case, the first switch module 200 cannot be turned on, the first switch module 200 is in a disconnected state and outputs a low-level detection signal. When the low voltage detection connector 2 is abnormally connected, the low voltage detection connector 2 no longer short-circuits the sampling resistor R1, the constant current output by the constant current source CCS passes through the sampling resistor R1, and the voltage across the sampling resistor R1 is not 0. In this case, the first switch module 200 can be turned on, the first switch module 200 is in a conducting state and outputs a high-level detection signal. Therefore, the control module 3 can determine that the low voltage detection connector 2 is connected normally based on the low-level detection signal, and can determine that the low voltage detection connector 2 is abnormally connected based on the high-level detection signal.

[0099] The embodiment of the present application generates a sampling signal on the sampling resistor R1 through the constant current source CCS. Since the constant current source CCS can provide a stable and accurate current output, a stable sampling signal can be generated at both ends of the sampling resistor R1 when the low-voltage detection connector 2 is abnormally connected, so that the first switch module 200 is in a stable conduction state, thereby improving the working reliability of the detection circuit 1.

[0100] See also Figure 6 In some embodiments, the detection circuit 1 may further include a third switch module 600, a first end of the third switch module 600 is connected to the control module 3, a second end of the third switch module 600 is connected to one end of the constant current source CCS, a third end of the third switch module 600 is connected to one end of the sampling resistor R1, and a fourth end of the third switch module 600 is grounded.

[0101] When in use, the control module 3 can send a control signal to the third switch module 600 as needed or at a certain time period to control the third switch module 600 to be turned on, thereby controlling the sampling module 100 to be powered on and working. When the third switch module 600 is turned off, the sampling module 100 is powered off and stops working, and the sampling resistor R1 of the sampling module 100 no longer consumes energy. Therefore, by controlling the sampling module 100 to be powered off and stop working in a predetermined time period through the third switch module 600, energy can be effectively saved.

[0102] The third switch module 600 may also be an optical coupler isolator. Figure 6 As shown, the first end of the optocoupler isolator is connected to the control module 3, the second end of the optocoupler isolator is connected to the constant current source CCS, the third end of the optocoupler isolator is connected to one end of the sampling resistor R1, and the fourth end of the optocoupler isolator is grounded. The optocoupler isolator can not only control the power on and off of the sampling module 100, but also realize electrical isolation, reduce the interference when the control module 3 sends the control signal to the second switch module 400, and improve the reliability of the control signal transmission.

[0103] See also Figure 4 and Figure 7 In some embodiments, there may be multiple low-voltage detection connectors 2, and there may be multiple sampling modules 100 and multiple first switch modules 200; multiple low-voltage detection connectors 2 are connected to multiple sampling modules 100 and multiple first switch modules 200 in a one-to-one correspondence. That is, each low-voltage detection connector 2 is connected to one sampling module 100 and one first switch module 200.

[0104] It should be noted that a vehicle is usually provided with multiple high-voltage connectors, and the low-voltage detection connector 2 is integrated inside the high-voltage connector, so the number of low-voltage detection connectors 2 is usually multiple. Correspondingly, the number of sampling modules 100 and first switch modules 200 is also multiple. For example, Figure 4 and Figure 7 As shown, there are four low-voltage detection connectors 2, and there are four sampling modules 100 and four first switch modules 200. From left to right in the figure, one low-voltage detection connector 2, one sampling module 100 and one first switch module 200 form a branch, and four low-voltage detection connectors 2, four sampling modules 100 and four first switch modules 200 together form four parallel branches, each of which is connected to the control module 3.

[0105] The embodiment of the present application is provided with a sampling module 100 and a first switch module 200 corresponding to each low-voltage detection connector 2, so as to realize the detection of multiple low-voltage detection connectors 2. When a low-voltage detection connector 2 fails, the control module 3 can promptly determine the abnormal connection of the low-voltage detection connector 2 through the sampling module 100 and the first switch module 200 connected to the low-voltage detection connector 2, and promptly repair or replace the low-voltage detection connector 2, thereby effectively eliminating the failure of the high-voltage interlocking system.

[0106] See also Figure 3 , Figure 4 , Figure 6 and Figure 7 In some embodiments, the detection circuit 1 may further include a pull-down resistor R2, a first end of the pull-down resistor R2 is connected to the second end of the first switch module 200, and a second end of the pull-down resistor R2 is grounded.

[0107] Among them, the resistance value of the pull-down resistor R2 can be selected in the range of 0.5KΩ to 10KΩ. This range of resistance values ​​can not only ensure that the pull-down resistor R2 does not generate excessive current due to being too small, but also effectively stabilize the interference signal to the ground. Due to the influence of the working environment, the designer can determine the resistance value of the pull-down resistor R2 through actual testing on the circuit board, and the embodiments of the present application do not specifically limit this.

[0108] For example, Figure 3 , Figure 4 , Figure 6 and Figure 7 The detection circuit 1 shown in FIG. 1 includes only one pull-down resistor R2. In practical applications, the detection circuit 1 may also include two or more pull-down resistors R2 connected in series, and the specific number of pull-down resistors R2 may be set according to actual needs. The functions implemented by multiple pull-down resistors R2 and one pull-down resistor R2 are the same, as long as the total resistance of multiple pull-down resistors R2 connected in series is equivalent to the resistance of one pull-down resistor R2.

[0109] As described above, when a vehicle is provided with multiple high-voltage connectors, the number of low-voltage detection connectors 2 can also be multiple. Accordingly, the number of sampling modules 100 and first switch modules 200 can also be multiple. A low-voltage detection connector 2, a sampling module 100 and a first switch module 200 form a branch. In the embodiment of the present application, a pull-down resistor R2 can be provided for each branch. For example, Figure 4 and Figure 7As shown, in the four branches composed of four low-voltage detection connectors 2, four sampling modules 100 and four first switch modules 200, each branch is provided with a pull-down resistor R2. In this way, a fixed 0 level can be provided to the ground terminal of the first switch module 200 of each branch, and the anti-static ability of the first switch module 200 of each branch is improved.

[0110] The embodiment of the present application can output the ground terminal signal of the first switch module 200 to the ground by setting the pull-down resistor R2. When the first switch module 200 is turned off, the pull-down resistor R2 can provide a fixed level, that is, 0 level, for the ground terminal of the first switch module 200. In addition, since the current always tends to flow to the line with smaller resistance, and the resistance value of the pull-down resistor R2 is smaller, the electrostatic discharge current can also be output to the ground along the line where the pull-down resistor R2 is located by setting the pull-down resistor R2, thereby preventing the ground terminal of the first switch module 200 from being damaged by electrostatic interference, thereby improving the anti-static ability of the first switch module 200.

[0111] See also Figure 3 , Figure 4 , Figure 6 and Figure 7 In some embodiments, the detection circuit 1 may further include a filter resistor R3 and a filter capacitor C, the first end of the filter resistor R3 is connected to the first plate of the filter capacitor C and the second end of the first switch module 200, the second end of the filter resistor R3 is connected to the control module 3, and the second plate of the filter capacitor C is grounded.

[0112] Among them, the resistance value of the filter resistor R3 and the capacitance value of the filter capacitor C can be determined according to factors such as filtering effect and stability. In actual applications, designers can determine the resistance value of the filter resistor R3 and the capacitance value of the filter capacitor C through actual testing on a circuit board. The embodiments of the present application do not make specific limitations on this.

[0113] As described above, when a vehicle is provided with multiple high-voltage connectors, the number of low-voltage detection connectors 2 is usually also multiple. Correspondingly, the number of sampling modules 100 and first switch modules 200 is also multiple. A low-voltage detection connector 2, a sampling module 100 and a first switch module 200 form a branch. In the embodiment of the present application, a filter resistor R3 and a filter capacitor C can be provided for each branch. For example, Figure 4 and Figure 7 As shown, in the four branches formed by the four low-voltage detection connectors 2, the four sampling modules 100 and the four first switch modules 200, each branch is provided with a filter resistor R3 and a filter capacitor C. In this way, the detection signal of the input control module 3 in each branch can be filtered to reduce the interference of the noise signal on the detection signal.

[0114] In an embodiment of the present application, the filter resistor R3 and the filter capacitor C can constitute an electronic filter. The electronic filter can filter the detection signal of the input control module 3 by utilizing the different responses of the filter resistor R3 and the filter capacitor C to signals of different frequencies, such as filtering out high-frequency noise in the detection signal, improving the purity of the detection signal, and reducing the interference of the noise signal on the detection signal. At the same time, the filter resistor R3 and the filter capacitor C can also smooth the detection signal to reduce the fluctuation of the detection signal, so that the detection signal received by the control module 3 is more stable, so as to ensure the detection reliability of the control module 3.

[0115] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A detection circuit, applied to a vehicle, comprising a high voltage interlocking circuit with a low voltage detection connector and a control module, characterized in that: The detection circuit comprises: A sampling module, wherein a first end of the sampling module is connected to a first end of the low voltage detection connector, a second end of the sampling module is connected to a second end of the low voltage detection connector, and the sampling module is used to generate a sampling signal; A first switch module, wherein the first end of the first switch module is connected to the first end of the sampling module, the controlled end of the first switch module is connected to the second end of the sampling module, the second end of the first switch module is connected to the control module, the first switch module receives the sampling signal and outputs a detection signal according to the sampling signal, so that the control module can determine the working state of the low-voltage detection connector based on the detection signal.

2. The detection circuit according to claim 1, characterized in that: The sampling module comprises a sampling resistor, one end of which is connected to the first end of the low voltage detection connector and connected to the power supply voltage, and the other end of which is connected to the second end of the low voltage detection connector.

3. The detection circuit according to claim 2, characterized in that: The detection circuit also includes: A second switch module, wherein a first end of the second switch module is connected to the power supply voltage, a second end of the second switch module is connected to one end of the sampling resistor, and a controlled end of the second switch module is connected to the control module.

4. The detection circuit according to claim 3, characterized in that: The detection circuit also includes: An isolation module, wherein a first end of the isolation module is connected to the control module, and a second end of the isolation module is connected to a controlled end of the second switch module.

5. The detection circuit according to claim 1, characterized in that: The detection circuit also includes a constant current source; The sampling module includes a sampling resistor, one end of which is connected to the first end of the low voltage detection connector and one end of the constant current source, and the other end of which is connected to the second end of the low voltage detection connector and the other end of the constant current source.

6. The detection circuit according to claim 5, characterized in that: The detection circuit also includes: A third switch module, wherein a first end of the third switch module is connected to the control module, a second end of the third switch module is connected to one end of the constant current source, a third end of the third switch module is connected to one end of the sampling resistor, and a fourth end of the third switch module is grounded.

7. The detection circuit according to any one of claims 1 to 6, characterized in that: There are multiple low-voltage detection connectors, and there are multiple sampling modules and multiple first switch modules. The multiple low-voltage detection connectors, the multiple sampling modules, and the multiple first switch modules are connected in a one-to-one correspondence.

8. The detection circuit according to claim 1, characterized in that: The detection circuit also includes: A pull-down resistor, wherein a first end of the pull-down resistor is connected to a second end of the first switch module, and a second end of the pull-down resistor is grounded.

9. The detection circuit according to claim 1, characterized in that: The detection circuit also includes: A filter resistor and a filter capacitor, wherein the first end of the filter resistor is connected to the first plate of the filter capacitor and the second end of the first switch module, the second end of the filter resistor is connected to the control module, and the second plate of the filter capacitor is grounded.

10. A vehicle, characterized in that: include: High voltage interlock circuit with low voltage detection connector; Control module; as well as The detection circuit according to any one of claims 1 to 9, wherein the detection circuit is connected to the low voltage detection connector and the control module.

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