High voltage interlock detection circuit and vehicle

Abstract

The application discloses a high-voltage interlock detection circuit and a vehicle, wherein the high-voltage interlock detection circuit comprises: a first detection branch comprising at least one first interlock switch, adapted to be connected to a power electronic integrated module, and in the case that each first interlock switch is disconnected, the first detection branch has different first resistance values, so as to determine a fault high-voltage device in the power electronic integrated module according to the first resistance values; a second detection branch comprising at least one second interlock switch, adapted to be connected to a battery system, and configured to determine whether the battery system is faulty according to an electric signal of the second detection branch; and a third detection branch comprising at least one third interlock switch, each third interlock switch being adapted to be connected to a high-voltage load, and in the case that each third interlock switch is disconnected, the third detection branch has different second resistance values, so as to determine a fault high-voltage load according to the second resistance values. The detection circuit realizes accurate positioning of an interlock fault position.

Description

TECHNICAL FIELD

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

[0002] With the increasing global concern for environmental protection and sustainable development, electric vehicles as a new type of green transportation have received widespread attention and development. There are more and more high-voltage electrical equipment in vehicles, and high-voltage interlocking is a key link to ensure high-voltage safety. In the related art, the high-voltage interlocking is usually one-way, and the interlocking link involves many components. When an interlocking fault occurs, it is difficult to troubleshoot. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art. To this end, the first object of the present application is to provide a high-voltage interlock detection circuit, which sets up three high-voltage interlock detection circuits, each of which independently performs high-voltage interlock detection, accurately locates the interlock fault position, and thus timely troubleshoots the faulty equipment.

[0004] The second object of the present application is to provide a vehicle.

[0005] To achieve the above-mentioned objects, according to the first aspect of the present application, a high-voltage interlock detection circuit is provided, comprising: a first detection branch comprising at least one first interlock switch, each first interlock switch being adapted to connect one high-voltage device in a power electronic integrated module, and in the case that each first interlock switch is open, the first detection branch has a first resistance value different from each other, so as to determine the faulty high-voltage device in the power electronic integrated module according to the first resistance value; a second detection branch comprising at least one second interlock switch, each second interlock switch being adapted to connect one high-voltage device in a battery system, the second detection branch being configured to determine whether the battery system has a fault according to an electrical signal of the second detection branch; and a third detection branch comprising at least one third interlock switch, each third interlock switch being adapted to connect one high-voltage load, and in the case that each third interlock switch is open, the third detection branch has a second resistance value different from each other, so as to determine the faulty high-voltage load according to the second resistance value.

[0006] The high-voltage interlocking detection circuit according to an embodiment of the present application comprises a first detection branch, a second detection branch and a third detection branch. The first detection branch comprises at least one first interlocking switch, each of which is adapted to be connected to a high-voltage device in an integrated power electronic module, and the first detection branch has different first resistance values when each first interlocking switch is disconnected, so as to determine a fault high-voltage device in the integrated power electronic module according to the first resistance values. The second detection branch comprises at least one second interlocking switch, each of which is adapted to be connected to a high-voltage device in a battery system, and the second detection branch is configured to determine whether the battery system is faulty according to an electrical signal of the second detection branch. The third detection branch comprises at least one third interlocking switch, each of which is adapted to be connected to a high-voltage load, and the third detection branch has different second resistance values when each third interlocking switch is disconnected, so as to determine a fault high-voltage load according to the second resistance values. In this way, three independent high-voltage interlocking detection branches are provided, each of which performs high-voltage interlocking detection independently, and each high-voltage interlocking detection branch is connected to fewer high-voltage devices. In addition, the first detection branch and the third detection branch can identify the position of the disconnected interlocking switch according to the resistance values, so as to accurately locate the interlocking fault position and thus timely investigate the fault device.

[0007] According to an embodiment of the present application, the first detection branch further comprises: at least one first detection resistor, each of which has a first node and is connected in parallel between two ends of a first interlocking switch, and each first detection resistor has a different resistance value; a first signal detection unit, an input end of which is connected to the first node, and the first signal detection unit is configured to detect a voltage signal of the first node to output a first detection value; and a first control unit, an input end of which is connected to an output end of the first signal detection unit, and the first control unit is configured to determine the first resistance value according to the first detection value, determine a corresponding first detection resistor according to the first resistance value, and determine a high-voltage device corresponding to the corresponding first detection resistor as a fault high-voltage device.

[0008] According to an embodiment of the present application, the first interlocking switch has four first interlocking switches, and the first detection resistor has three first detection resistors. The four first interlocking switches are connected in series, the first first interlocking switch is adapted to be connected to a direct-current bus input interface, the second first interlocking switch is adapted to be connected to an alternating-current charging interface, and the first first detection resistor is connected in parallel with the second first interlocking switch. The third first interlocking switch is adapted to be connected to a power output interface of a vehicle-mounted heater, and the second first detection resistor is connected in parallel with the third first interlocking switch. The fourth first interlocking switch is adapted to be connected to a power output end of a compressor, and the third first detection resistor is connected in parallel with the fourth first interlocking switch. One end of the first first detection resistor is the first node, and the other end of the third first detection resistor is grounded.

[0009] According to one embodiment of the present application, the first detection branch further comprises: a first protection device, the first protection device being arranged between the first first interlock switch and the third first interlock switch, a control end of the first protection device being connected to a first output end of the first control unit to stop the power output of the vehicle heater according to a first control signal sent by the first control unit; and a second protection device, the second protection device being arranged between the first first interlock switch and the fourth first interlock switch, a control end of the second protection device being connected to a second output end of the first control unit to stop the power output of the vehicle heater according to a second control signal sent by the first control unit, wherein the first control unit generates the first control signal and / or the second control signal according to the first resistance value.

[0010] According to one embodiment of the present application, the first control unit is further configured to generate the first control signal when the first resistance value is a resistance value corresponding to the third first interlock switch, or generate the second control signal when the first resistance value is a resistance value corresponding to the fourth first interlock switch, or generate the first control signal and the second control signal when the first resistance value is a sum of the resistance value corresponding to the third first interlock switch and the resistance value corresponding to the fourth first interlock switch.

[0011] According to one embodiment of the present application, the third detection branch further comprises: at least one second detection resistor, each second detection resistor having a second node, each second detection resistor being connected in parallel between two ends of a third interlock switch, and each second detection resistor having a different resistance value; a second signal detection unit, an input end of the second signal detection unit being connected to the second node, the second signal detection unit being configured to detect a voltage signal of the second node to output a second detection value; and a second control unit, an input end of the second control unit being connected to an output end of the second signal detection unit, the second control unit being configured to determine a second resistance value according to the second detection value, determine a corresponding second detection resistor according to the second resistance value, and determine a high-voltage load corresponding to the corresponding second detection resistor as a fault high-voltage load.

[0012] According to one embodiment of the present application, the third interlock switch has two, and the second detection resistor has two, wherein the two third interlock switches are connected in series, the first third interlock switch is adapted to connect to a power input interface of the vehicle heater, and the first second detection resistor is connected in parallel with the first third interlock switch, the second third interlock switch is adapted to connect to a power input end of the compressor, and the second second detection resistor is connected in parallel with the second third interlock switch, one end of the first second detection resistor being the second node, and the other end of the second first detection resistor being grounded.

[0013] According to one embodiment of the present application, the second control unit is further in communication connection with the first control unit, and the second control unit is further configured to send a control instruction to the first control unit according to the second resistance value, so that the first control unit generates the first control signal and / or the second control signal according to the control instruction.

[0014] According to one embodiment of the present application, the second control unit is further configured to, in the case that the second resistance value is a resistance value corresponding to the first third interlocking switch, generate a first control instruction and send the first control instruction to the first control unit, so that the first control unit generates the first control signal according to the first control instruction; or in the case that the second resistance value is a resistance value corresponding to the second third interlocking switch, generate a second control instruction and send the second control instruction to the first control unit, so that the first control unit generates the second control signal according to the second control instruction; or in the case that the second resistance value is a sum of a resistance value corresponding to the first third interlocking switch and a resistance value corresponding to the second third interlocking switch, generate a third control instruction and send the third control instruction to the first control unit, so that the first control unit generates the first control signal and the second control signal according to the third control instruction.

[0015] According to one embodiment of the present application, the first signal detection unit and the second signal detection unit each comprise: a first diode, an anode of the first diode being adapted to input a preset power supply; a first resistor, one end of the first resistor being connected to a cathode of the first diode, and the other end of the first resistor being an input end of the corresponding signal detection unit; a first capacitor, one end of the first capacitor being connected to the other end of the first resistor, and the other end of the first capacitor being grounded; a second resistor, one end of the second resistor being connected to the other end of the first resistor, and the other end of the second resistor being an output end of the corresponding signal detection unit; and a second capacitor, one end of the second capacitor being connected to the other end of the second resistor, and the other end of the second capacitor being grounded.

[0016] According to one embodiment of the present application, the second control unit is a central computing unit.

[0017] According to one embodiment of the present application, the first protection device and the second protection device each comprise a relay.

[0018] According to one embodiment of the present application, the first control unit is a motor control unit.

[0019] According to one embodiment of the present application, the second interlock switch is multiple, and the multiple second interlock switches are connected in series to form a third node, and the second detection branch further comprises: a third signal detection unit, an input end of the third signal detection unit being connected with the third node, the third signal detection unit being configured to detect a voltage signal of the third node to output a third detection value; and a third control unit, an input end of the third control unit being connected with an output end of the third signal detection unit, the third control unit being configured to determine whether the battery system has a fault according to the third detection value.

[0020] According to one embodiment of the present application, the third control unit is a battery management system.

[0021] To achieve the above object, according to a second aspect of the present application, a vehicle is provided, comprising the high-voltage interlock detection circuit of any one of the preceding embodiments.

[0022] According to the vehicle of the embodiments of the present application, by adopting the high-voltage interlock detection circuit, three high-voltage interlock detection circuits are arranged, each of which independently performs high-voltage interlock detection, so that the fault position of the interlock is accurately positioned, and the fault equipment is timely investigated.

[0023] Additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be understood through practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic diagram of a high-voltage interlock detection circuit in the related art;

[0025] Figure 2 is a circuit diagram of a signal detection circuit in the related art;

[0026] Figure 3 is a structural schematic diagram of a high-voltage interlock detection circuit according to one embodiment of the present application;

[0027] Figure 4 is a structural schematic diagram of a first detection branch according to one embodiment of the present application;

[0028] Figure 5 is a structural schematic diagram of a third detection branch according to one embodiment of the present application;

[0029] Figure 6 is a circuit diagram of a first signal detection unit and a second signal detection unit according to one embodiment of the present application;

[0030] Figure 7 is a structural schematic diagram of a second detection branch according to one embodiment of the present application;

[0031] Figure 8is a structural schematic diagram of a vehicle according to an embodiment of the present application. DETAILED DESCRIPTION

[0032] Embodiments of the present application are described in detail below with reference to examples illustrated in the accompanying drawings, in which the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0033] It should be noted that the present application is made by the inventor's understanding and research on the following problems:

[0034] Figure 1 A high-voltage interlock link in the related art is shown as follows. Figure 1 As shown in FIG. 1, all the interlock switches of the high-voltage electrical appliances (101, 201, 202, 301 and 302) are connected in series in the related art, and are connected with a signal detection circuit and an interlock detection module to realize high-voltage interlock detection, wherein the interlock detection module can be a battery management system 23, the series circuit is connected with the signal detection circuit, and an output end of the signal detection circuit is connected with the interlock detection module. The signal detection circuit is shown as follows. Figure 2 The switch S is used to represent the switching state of the series circuit. When each high-voltage electrical appliance works normally, all the interlock switches in the series circuit are closed, and the series circuit is connected, so the switch S is closed; when at least one high-voltage electrical appliance works abnormally, at least one high-voltage interlock in the series circuit is opened, and the series circuit is disconnected, so the switch S is opened. When the switching state of the switch S changes, the voltage value output by the signal detection circuit changes, and the interlock detection module can judge the interlock switching state according to the voltage value.

[0035] The high-voltage interlock link in the related art involves many components, and the high-voltage interlock link will be disconnected when any high-voltage electrical appliance works abnormally, so it is difficult to troubleshoot the fault after the high-voltage interlock link fails.

[0036] Based on this, embodiments of the present application provide a high-voltage interlock detection circuit and a vehicle, three high-voltage interlock detection circuits are provided, each high-voltage interlock detection circuit independently performs high-voltage interlock detection, and precise positioning of the interlock fault position is realized, so that the fault equipment can be promptly investigated.

[0037] The high-voltage interlock detection circuit and the vehicle of the embodiments of the present application are described below with reference to the accompanying drawings.

[0038] Figure 3 is a structural schematic diagram of a high-voltage interlock detection circuit according to an embodiment of the present application. As shown in FIG. 2, the high-voltage interlock detection circuit includes three high-voltage interlock detection circuits 1, 2 and 3, and each high-voltage interlock detection circuit 1, 2 and 3 is connected with a high-voltage electrical appliance 101, 201, 202, 301 and 302. Figure 3As shown, the high-voltage interlock detection circuit includes a first detection branch 10, a second detection branch 20 and a third detection branch 30.

[0039] The first detection branch 10 includes at least one first interlock switch (S1, S2, S3 and S4), each of which is adapted to connect one high-voltage device in the power electronic integrated module, and the first resistance value of the first detection branch 10 is different when each first interlock switch is open, so as to determine the fault high-voltage device in the power electronic integrated module according to the first resistance value; the second detection branch 20 includes at least one second interlock switch (S7, S8 and S9), each of which is adapted to connect one high-voltage device in the battery system, and the second detection branch 20 is configured to determine whether the battery system fails according to the electrical signal of the second detection branch 20; the third detection branch 30 includes at least one third interlock switch (S5 and S6), each of which is adapted to connect one high-voltage load, and the second resistance value of the third detection branch 30 is different when each third interlock switch is open, so as to determine the fault high-voltage load according to the second resistance value.

[0040] Specifically, the power electronic integrated module in the vehicle integrates a motor control unit, a DC-DC (direct current-direct current) converter, an on-board charger and an on-board heater 301 and the like, and each first interlock switch is adapted to connect one high-voltage device in the power electronic integrated module. In the case that all high-voltage devices in the power electronic integrated module are working normally, all first interlock switches (S1, S2, S3 and S4) are in a closed state; in the case that at least one high-voltage device in the power electronic integrated module is abnormal, at least one first interlock switch is in an open state, because the first resistance value of the first detection branch 10 is different when different first interlock switches are open, so the fault high-voltage device can be determined according to the first resistance value of the first detection branch 10.

[0041] The battery system includes a direct current charging input end 201, an MSD 202 (Manual Service Disconnect), an output end (HV+ and HV-) of a direct current bus, and each second interlock switch is adapted to connect one high-voltage device in the battery system. In the case that all high-voltage devices in the battery system are working normally, all second interlock switches (S7, S8 and S9) are in a closed state; in the case that at least one high-voltage device in the battery system is abnormal, at least one second interlock switch is in an open state, because the electrical signal of the second detection branch 20 is different when at least one second interlock switch is open and all second interlock switches are closed, so whether the battery system fails can be determined according to the electrical signal of the second detection branch 20.

[0042] The high-voltage loads include a compressor 302, an on-board heater 301, and the like, and each third interlock switch is adapted to be connected to one high-voltage load. When each high-voltage load is working normally, all the third interlock switches (S5 and S6) are in a closed state; when at least one high-voltage load is working abnormally, at least one third interlock switch is in an open state, because the second resistance value of the third detection branch 30 is different when different third interlock switches are open, so that the faulty high-voltage device can be determined according to the second resistance value of the third detection branch 30.

[0043] In the above embodiment, three independent high-voltage interlock detection branches are provided, each high-voltage interlock detection branch performs high-voltage interlock detection independently, each high-voltage interlock detection branch is connected to fewer high-voltage devices, and the first detection branch and the third detection branch can identify the position of the open interlock switch according to the resistance value, thereby accurately positioning the interlock fault position and timely troubleshooting the faulty device.

[0044] In some embodiments, as shown in Figure 3 and Figure 4 The first detection branch 10 further includes at least one first detection resistor (Rs1, Rs2, and Rs3), a first signal detection unit 11, and a first control unit 12, wherein the at least one first detection resistor (Rs1, Rs2, and Rs3) has a first node J1, each first detection resistor is connected in parallel between the two ends of one first interlock switch, and each first detection resistor has a different resistance value; the input end of the first signal detection unit 11 is connected to the first node J1, and the first signal detection unit 11 is configured to detect the voltage signal of the first node J1 to output a first detection value; the input end of the first control unit 12 is connected to the output end of the first signal detection unit 11, and the first control unit 12 is configured to determine the first resistance value according to the first detection value, determine the corresponding first detection resistor according to the first resistance value, and determine the high-voltage device corresponding to the corresponding first detection resistor as the faulty high-voltage device.

[0045] Specifically, when the first interlock switch is closed, the corresponding first detection resistor is short-circuited; when the first interlock switch is open, the corresponding first detection resistor is connected to the circuit. Therefore, when all the high-voltage devices in the power electronic integrated module are working normally, all the first detection resistors (Rs1, Rs2, and Rs3) are short-circuited; when at least one high-voltage device in the power electronic integrated module is working abnormally, at least one first detection resistor is short-circuited, because the resistance value of each first detection resistor is different, the voltage signal of the first node J1 is also different. The first control unit 12 can determine which first detection resistor is connected to the circuit according to the voltage signal of the first node J1, and then determine the high-voltage device corresponding to the first detection resistor connected to the circuit as the faulty high-voltage device.

[0046] It should be noted that when there is only one first interlock switch, the first detection resistor can also not be provided.

[0047] Further, in some embodiments, the first control unit 12 is a motor control unit.

[0048] It can be understood that, because the first detection branch 10 detects the high-voltage equipment in the power electronic integrated module, and the power electronic integrated module integrates the motor control unit, the motor control unit can be used for high-voltage interlock detection.

[0049] In the above embodiment, by connecting the first detection resistors with different resistance values in parallel at both ends of each first interlock switch, each first interlock switch has position identification information, and the first control unit determines the first detection resistor connected to the resistance according to the voltage signal of the first node, so that the position where the first interlock switch is disconnected can be quickly identified, and the high-voltage equipment corresponding to the corresponding first detection resistor is determined as the fault high-voltage equipment, thereby realizing accurate positioning of the fault high-voltage equipment.

[0050] In some embodiments, as shown in Figure 3 and Figure 4 , the first interlock switch has four, and the first detection resistor has three, wherein the four first interlock switches (S1, S2, S3 and S4) are connected in series, the first first interlock switch S1 is adapted to connect the DC bus input interface (HV+ and HV-), the second first interlock switch S2 is adapted to connect the AC charging interface 101, and the first first detection resistor Rs1 is connected in parallel with the second first interlock switch S2, the third first interlock switch S3 is adapted to connect the power output interface of the vehicle-mounted heater 301, and the second first detection resistor Rs2 is connected in parallel with the third first interlock switch S3, the fourth first interlock switch S4 is adapted to connect the power output end of the compressor 302, and the third first detection resistor Rs3 is connected in parallel with the fourth first interlock switch S4, one end of the first first detection resistor Rs1 is the first node J1, and the other end of the third first detection resistor Rs3 is grounded.

[0051] Specifically, when the first interlock switch S1 is open, the vehicle cannot receive high voltage, and therefore, the vehicle cannot function normally. When the second interlock switch S2 is open, the first control unit 12 detects the detection resistance of the connected circuit as the first detection resistance Rs1. When the third interlock switch S3 is open, the first control unit 12 detects the detection resistance of the connected circuit as the second detection resistance Rs2. When the fourth interlock switch S4 is open, the first control unit 12 detects the detection resistance of the connected circuit as the third detection resistance Rs3. When both the third and fourth interlock switches S3 and S4 are open, the first control unit 12 detects the detection resistance of the connected circuit as the sum of the second and third detection resistances Rs2 and Rs3.

[0052] In some embodiments, such as Figure 3 As shown, the first detection branch 10 further includes: a first protection device and a second protection device. The first protection device is disposed between the first first interlock switch S1 and the third first interlock switch S3. The control terminal of the first protection device is connected to the first output terminal of the first control unit 12 to stop the power output of the vehicle heater 301 according to the first control signal sent by the first control unit 12. The second protection device is disposed between the first first interlock switch S1 and the fourth first interlock switch S4. The control terminal of the second protection device is connected to the second output terminal of the first control unit 12 to stop the power output of the vehicle heater 301 according to the second control signal sent by the first control unit 12. The first control unit 12 generates the first control signal and / or the second control signal based on the first resistance value.

[0053] Specifically, the power electronic integrated module supplies power to the vehicle heater 301 through its power output interface and to the compressor 302 through its power output terminal. When the vehicle heater 301 is operating normally, the first protection device does not interfere with its operation. However, when the vehicle heater 301 malfunctions, the third first interlock switch S3 opens, the first resistance value changes, and the first control unit 12 generates a first control signal based on the first resistance value. The first protection device then stops supplying power to the vehicle heater 301 based on the first control signal. Similarly, when the compressor 302 is operating normally, the first protection device does not interfere with its operation. However, when the compressor 302 malfunctions, the fourth first interlock switch S4 opens, the first resistance value changes, and the first control unit 12 generates a second control signal based on the first resistance value. The second protection device then stops supplying power to the compressor 302 based on the second control signal.

[0054] Optional, such as Figure 3 As shown, the first protection device and the second protection device each include a relay.

[0055] by Figure 3 Taking the example shown, the first protection device is the first relay Relay1, and the second protection device is the second relay Relay2. One end of the coil of the first relay Relay1 is connected to the first control unit 12, and the other end of the coil of the first relay Relay1 is grounded. One end of the switch of the first relay Relay1 is connected to the DC positive bus HV+, and the other end of the switch of the first relay Relay1 is connected to the positive terminal of the power output interface of the vehicle heater 301. One end of the coil of the second relay Relay2 is connected to the first control unit 12, and the other end of the coil of the second relay Relay2 is grounded. One end of the switch of the second relay Relay2 is connected to the DC positive bus HV+, and the other end of the switch of the second relay Relay2 is connected to the positive terminal of the power output of the compressor 302. When the third first interlock switch S3 is closed, the control unit outputs a high-level signal to the coil of the first relay Relay1, which in turn drives the switch of the first relay Relay1 to close, thus supplying power to the vehicle heater 301. When the third first interlock switch S3 is open, the control unit outputs a low-level signal to the coil of the first relay Relay1, which in turn drives the switch of the first relay Relay1 to open, thus stopping the power supply to the vehicle heater 301. When the fourth first interlock switch S4 is closed, the control unit outputs a high-level signal to the coil of the second relay Relay2, which in turn drives the switch of the second relay Relay2 to close, thus supplying power to the compressor 302. When the fourth first interlock switch S4 is open, the control unit outputs a low-level signal to the coil of the second relay Relay2, which in turn drives the switch of the second relay Relay2 to open, thus stopping the power supply to the compressor 302.

[0056] It should be noted that the first and second protection devices are not limited to relays; other controllable switching devices can also be used, and no specific restrictions are imposed here.

[0057] In the above embodiment, after the first detection branch detects the fault location of the interlock switch based on the first resistance value, it controls the first protection device and the second protection device based on the first resistance value to disconnect the power output of the corresponding high-voltage equipment, thereby cutting off the faulty high-voltage equipment. This not only ensures the electrical safety of the vehicle but also does not affect other functions of the vehicle.

[0058] In some embodiments, the first control unit 12 is further configured to generate a first control signal when the first resistance value is the resistance value corresponding to the third first interlock switch S3; or generate a second control signal when the first resistance value is the resistance value corresponding to the fourth first interlock switch S4; or generate a first control signal and a second control signal when the first resistance value is the sum of the resistance values ​​corresponding to the third first interlock switch S3 and the resistance values ​​corresponding to the fourth first interlock switch S4.

[0059] Understandably, when the first resistance value is the resistance value corresponding to the third first interlock switch S3, it indicates that the third first interlock switch S3 is open, and therefore, the control unit generates a first control signal; when the first resistance value is the resistance value corresponding to the fourth first interlock switch S4, it indicates that the fourth first interlock switch S4 is open, and therefore, the control unit generates a second control signal; when the first resistance value is the sum of the resistance values ​​corresponding to the third first interlock switch S3 and the fourth first interlock switch S4, it indicates that both the third first interlock switch S3 and the fourth first interlock switch S4 are open, and therefore, the control unit generates a first control signal and a second control signal.

[0060] In some embodiments, such as Figure 3 and Figure 5 As shown, the third detection branch 30 further includes: at least one second detection resistor (Rs4 and Rs5), a second signal detection unit 31, and a second control unit 32. The at least one second detection resistor (Rs4 and Rs5) has a second node J2. Each second detection resistor is connected in parallel between the two ends of a third interlock switch, and the resistance value of each second detection resistor is different. The input terminal of the second signal detection unit 31 is connected to the second node J2, and the second signal detection unit 31 is configured to detect the voltage signal of the second node J2 to output a second detection value. The input terminal of the second control unit 32 is connected to the output terminal of the second signal detection unit 31, and the second control unit 32 is configured to determine a second resistance value based on the second detection value, determine a corresponding second detection resistor based on the second resistance value, and identify the high-voltage load corresponding to the corresponding second detection resistor as a faulty high-voltage load.

[0061] Specifically, the detection principle of the third detection branch 30 is similar to that of the first detection branch 10. When the third interlock switch is closed, the corresponding second detection resistor is short-circuited; when the third interlock switch is open, the corresponding second detection resistor is connected to the circuit. Therefore, when all high-voltage loads are working normally, all second detection resistors (Rs4 and Rs5) are short-circuited; when at least one high-voltage load is abnormal, at least one second detection resistor is short-circuited. Since the resistance values of each second detection resistor are different, the voltage signals of the second node J2 are also different. The second control unit 32 can determine which second detection resistor is connected to the circuit according to the voltage signals of the second node J2, and then determine the high-voltage load corresponding to the second detection resistor connected to the circuit as the fault high-voltage device.

[0062] Further, in some embodiments, the second control unit 32 is a central computing unit.

[0063] It can be understood that, since the third detection branch 30 is used to detect high-voltage loads, the central computing unit is a key component in a smart connected vehicle, mainly responsible for providing sufficient computing power to support the related business logic of smart driving and smart cockpit, so the high-voltage interlock detection can be performed by using the electric central computing unit.

[0064] In the above embodiment, by connecting second detection resistors with different resistance values in parallel at both ends of each third interlock switch, each third interlock switch has position identification information, and the second control unit determines the second detection resistor connected to the resistance according to the voltage signals of the second node. This can quickly identify the position of the open third interlock switch, and determine the high-voltage load corresponding to the corresponding second detection resistor as the fault high-voltage load, thereby achieving accurate positioning of the fault high-voltage load.

[0065] In some embodiments, as shown in Figure 3 and Figure 5 , the third interlock switch has 2, and the second detection resistor has 2, wherein the 2 third interlock switches (S5 and S6) are connected in series, the first third interlock switch S5 is adapted to connect the power input interface of the vehicle-mounted heater 301, and the first second detection resistor Rs4 is connected in parallel with the first third interlock switch S5; the second third interlock switch S6 is adapted to connect the power input end of the compressor 302, and the second second detection resistor Rs2 is connected in parallel with the second third interlock switch S6; one end of the first second detection resistor Rs4 is the second node J2, and the other end of the second first detection resistor Rs2 is grounded.

[0066] Specifically, in the case that the first third interlocking switch S5 is off, the second control unit 32 detects that the detection resistance of the access circuit is the first second detection resistance Rs4; in the case that the second third interlocking switch S6 is off, the second control unit 32 detects that the detection resistance of the access circuit is the second second detection resistance Rs2; in the case that the first third interlocking switch S5 is off and the second third interlocking switch S6 is off, the second control unit 32 detects that the detection resistance of the access circuit is the sum of the first second detection resistance Rs4 and the second second detection resistance Rs2.

[0067] In some embodiments, the second control unit 32 is also communicatively connected with the first control unit 12, and the second control unit 32 is further configured to send a control instruction to the first control unit 12 according to the second resistance value, so that the first control unit 12 generates the first control signal and / or the second control signal according to the control instruction.

[0068] Specifically, when the second control unit 32 determines that at least one high-voltage load fails according to the second resistance value, the second control unit 32 also generates a control instruction according to the second resistance value, and the first control unit 12 generates the first control signal and / or the second control signal according to the control instruction, so that the first protection device and / or the second protection device disconnect the power supply of the failed high-voltage load.

[0069] Specifically, the second control unit 32 is further configured to, in the case that the second resistance value is the resistance value corresponding to the first third interlocking switch S5, generate a first control instruction and send the first control instruction to the first control unit 12, so that the first control unit 12 generates the first control signal according to the first control instruction; or in the case that the second resistance value is the resistance value corresponding to the second third interlocking switch S6, generate a second control instruction and send the second control instruction to the first control unit 12, so that the first control unit 12 generates the second control signal according to the second control instruction; or in the case that the second resistance value is the sum of the resistance value corresponding to the first third interlocking switch S5 and the resistance value corresponding to the second third interlocking switch S6, generate a third control instruction and send the third control instruction to the first control unit 12, so that the first control unit 12 generates the first control signal and the second control signal according to the third control instruction.

[0070] When the second resistance value is the resistance value corresponding to the first third interlock switch S5, the first third interlock switch S5 is disconnected, indicating that the on-board charger is malfunctioning, and the first protection device is used to control the power supply of the on-board charger. Therefore, the second control unit 32 generates a first control instruction and sends the first control instruction to the first control unit 12, the first control unit 12 generates a first control signal, and the first protection device disconnects the power supply of the on-board charger according to the first control signal. When the second resistance value is the resistance value corresponding to the second third interlock switch S6, the second third interlock switch S6 is disconnected, indicating that the compressor 302 is malfunctioning, and the second protection device is used to control the power supply of the compressor 302. Therefore, the second control unit 32 generates a second control instruction and sends the second control instruction to the first control unit 12, the first control unit 12 generates a second control signal, and the second protection device disconnects the power supply of the compressor 302 according to the second control signal. When the second resistance value is the sum of the resistance value corresponding to the first third interlock switch S5 and the resistance value corresponding to the second third interlock switch S6, it indicates that both the on-board heater 301 and the compressor 302 are malfunctioning. Therefore, the second control unit 32 generates a third control instruction and sends the third control instruction to the first control unit 12, the first control unit 12 generates a first control signal and a second control signal, the first protection device disconnects the power supply of the on-board charger according to the first control signal, and the second protection device disconnects the power supply of the compressor 302 according to the second control signal.

[0071] In the above embodiment, after detecting the interlock switch fault position according to the second resistance value, the second control unit generates a control instruction according to the second resistance value, so that the first control unit controls the first protection device and the second protection device according to the control instruction to disconnect the power input of the corresponding high-voltage load, thereby cutting off the malfunctioning high-voltage load and improving the safety of the vehicle.

[0072] In some embodiments, as shown in Figure 6 The first signal detection unit 11 and the second signal detection unit 31 each include a first diode D1, a first resistor R1, a first capacitor C1, a second resistor R2, and a second capacitor C2. The anode of the first diode D1 is adapted to input a preset power VCC. One end of the first resistor R1 is connected to the cathode of the first diode D1, and the other end of the first resistor R1 is the input end of the corresponding signal detection unit. One end of the first capacitor C1 is connected to the other end of the first resistor R1, and the other end of the first capacitor C1 is grounded. One end of the second resistor R2 is connected to the other end of the first resistor R1, and the other end of the second resistor R2 is the output end of the corresponding signal detection unit. One end of the second capacitor C2 is connected to the other end of the second resistor R2, and the other end of the second capacitor C2 is grounded.

[0073] Specifically, the other end of the first resistor R1 of the first signal detection unit 11 is the first node J1, the other end of the first resistor R1 of the second signal detection unit 31 is the second node J2, the other end of the second resistor R2 of the first signal detection unit 11 is the output end of the first signal detection unit 11, and the other end of the second resistor R2 of the second signal detection unit 31 is the output end of the second signal detection unit 31. When all the first interlock switches are closed, the first node J1 is grounded; when at least one first interlock switch is open, the first node J1 is grounded through the first detection resistor corresponding to the open first interlock switch, thus the voltage division mode of the first signal detection unit 11 changes, and thus the voltage signal output by the first signal detection unit 11 changes. Similarly, when all the third interlock switches are closed, the second node J2 is grounded; when at least one third interlock switch is open, the second node J2 is grounded through the second detection resistor corresponding to the open third interlock switch, thus the voltage division mode of the second signal detection unit 31 changes, and thus the voltage signal output by the second signal detection unit 31 changes.

[0074] In the above embodiment, when different interlock switches are open, the voltage division mode of the first signal detection unit and the second signal detection unit changes, and the voltage signal output by the first signal detection unit and the second signal detection unit changes, thus the first control unit and the second control unit can calculate the corresponding resistance value.

[0075] In some embodiments, as shown in Figure 3 and Figure 7 , the second interlock switch has a plurality of second interlock switches (S7, S8 and S9) connected in series to form a third node J3, and the second detection branch 20 further comprises a third signal detection unit 21 and a third control unit 22, wherein the input end of the third signal detection unit 21 is connected to the third node J3, the third signal detection unit 21 is configured to detect the voltage signal of the third node J3 to output a third detection value; the input end of the third control unit 22 is connected to the output end of the third signal detection unit 21, and the third control unit 22 is configured to determine whether the battery system fails according to the third detection value.

[0076] Specifically, the third signal detection unit 21 can adopt a signal detection unit as shown in Figure 6 , when all the second interlock switches are closed, the third node J3 is grounded, and when at least one second interlock switch is open, the third node J3 is suspended and divided by the first resistor R1 and the second resistor R2. Thus, the third detection value changes, and the third control unit 22 can determine that the battery system fails according to the third detection value.

[0077] Optionally, the second interlock switches are three, a first second interlock switch S7 is adapted to connect the input end 201 of the DC charging, a second second interlock switch S8 is adapted to connect the output end (HV+ and HV-) of the DC bus, and a third second interlock switch S9 is adapted to connect the MSD 202.

[0078] Specifically, when the first second interlock switch S7 is off and / or the third second interlock switch S9 is off, the whole vehicle cannot be charged to high voltage, and the third control unit 22 cannot be powered on and cannot be detected. Therefore, when the third control unit 22 can detect the change of the third detection value, the third control unit 22 can determine that the DC charging has a fault.

[0079] Further, in some embodiments, the third control unit 22 is a battery management system.

[0080] It can be understood that, because the second detection branch 20 detects the battery system, the third control unit 22 can be a battery management system, so that the first control unit 12, the second control unit 32 and the third control unit 22 are respectively different detection subjects, and when any one of the detection subjects is damaged, the normal work of the other detection subjects will not be affected, thereby further improving the safety of the vehicle.

[0081] In summary, the high-voltage interlock detection circuit according to the embodiments of the present application includes a first detection branch, a second detection branch and a third detection branch, wherein the first detection branch includes at least one first interlock switch, each first interlock switch is adapted to connect one high-voltage device in the power electronic integrated module, and in the case that each first interlock switch is off, the first resistance value of the first detection branch is different, so as to determine the fault high-voltage device in the power electronic integrated module according to the first resistance value; the second detection branch includes at least one second interlock switch, each second interlock switch is adapted to connect one high-voltage device in the battery system, and the second detection branch is configured to determine whether the battery system has a fault according to the electrical signal of the second detection branch; the third detection branch includes at least one third interlock switch, each third interlock switch is adapted to connect one high-voltage load, and in the case that each third interlock switch is off, the second resistance value of the third detection branch is different, so as to determine the fault high-voltage load according to the second resistance value. Thus, three independent high-voltage interlock detection branches are provided, each high-voltage interlock detection branch separately performs high-voltage interlock detection, the high-voltage devices connected by each high-voltage interlock detection branch are less, and the first detection branch and the third detection branch can identify the position of the off interlock switch according to the resistance value, so as to accurately locate the interlock fault position and timely investigate the fault device.

[0082] Corresponding to the above-mentioned embodiments, the embodiments of the present application also provide a vehicle. As Figure 8As shown, the vehicle 1000 includes the high-voltage interlock detection circuit 100 of any of the preceding embodiments.

[0083] According to the vehicle of the embodiment of the present application, by adopting the high-voltage interlock detection circuit, three high-voltage interlock detection circuits are arranged, each of which independently performs high-voltage interlock detection, so as to accurately locate the interlock fault position, and thus the fault equipment can be timely investigated.

[0084] It should be understood that parts of the present application can be realized by hardware, software, firmware or a combination thereof. In the above-described embodiments, a plurality of steps or methods can be realized by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if realized by hardware, and as in another embodiment, any one or a combination of the following technologies known in the art can be used: discrete logic circuit with logic gate circuit for implementing logic functions on data signals, application specific integrated circuit with suitable combination logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA), etc.

[0085] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present description, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0086] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0087] In addition, the terms "first", "second" and the like in the embodiments of the present application are used only for the purpose of description, and can not be understood as indicating or implying relative importance or implying the number of technical features indicated in the embodiments. Therefore, the features defined with the terms "first", "second" and the like in the embodiments of the present application can be explicitly or implicitly indicated to include at least one of the features in the embodiments. In the description of the present application, the meaning of the word "plurality" is at least two or two or more, such as two, three, four, etc., unless otherwise specifically limited in the embodiments.

[0088] In the present application, unless otherwise specifically defined or limited in the embodiments, the terms "mounting", "connecting", "connecting" and "fixing" and the like appearing in the embodiments should be understood in a broad sense, for example, the connection can be fixed connection, or detachable connection, or integral, which can be understood, or mechanical connection, electrical connection, etc. Of course, it can also be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements, or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific implementation situation.

[0089] In the present application, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0090] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A high-voltage interlock detection circuit, characterized in that, include: A first detection branch includes at least one first interlock switch and a first control unit. Each first interlock switch is adapted to connect to a high-voltage device in a power electronics integrated module, and the first resistance value of the first detection branch is different when each first interlock switch is open. The first control unit is configured to determine the faulty high-voltage device in the power electronics integrated module based on the first resistance value. The second detection branch includes at least one second interlock switch, each second interlock switch being adapted to connect to a high-voltage device in the battery system, and the second detection branch is configured to determine whether the battery system has malfunctioned based on the electrical signal of the second detection branch. The third detection branch includes at least one third interlock switch, each of the third interlock switches being adapted to connect to a high-voltage load, and the second resistance value of the third detection branch being different when each of the third interlock switches is open, so as to determine the faulty high-voltage load based on the second resistance value; The first detection branch also includes: The first protection device has its control terminal connected to the first output terminal of the first control unit to stop the power output of the vehicle heater according to the first control signal sent by the first control unit. The second protection device has its control terminal connected to the second output terminal of the first control unit to stop the power output of the compressor according to the second control signal sent by the first control unit. The first control unit generates the first control signal and / or the second control signal according to the first resistance value.

2. The high-voltage interlock detection circuit according to claim 1, characterized in that, The first detection branch also includes: At least one first detection resistor, the at least one first detection resistor having a first node, each first detection resistor being connected in parallel between the two ends of a first interlock switch, and each first detection resistor having a different resistance value; A first signal detection unit, the input terminal of which is connected to the first node, is configured to detect the voltage signal of the first node and output a first detection value. The input terminal of the first control unit is connected to the output terminal of the first signal detection unit. The first control unit is also configured to determine the first resistance value based on the first detection value, determine the corresponding first detection resistance based on the first resistance value, and identify the high-voltage equipment corresponding to the corresponding first detection resistance as the faulty high-voltage equipment.

3. The high-voltage interlock detection circuit according to claim 2, characterized in that, There are four first interlock switches and three first detection resistors. The four first interlock switches are connected in series. The first first interlock switch is adapted to connect to the DC bus input interface. The second first interlock switch is adapted to connect to the AC charging interface, and the first first detection resistor is connected in parallel with the second first interlock switch. The third first interlock switch is adapted to connect to the power output interface of the vehicle heater, and the second first detection resistor is connected in parallel with the third first interlock switch. The fourth first interlock switch is adapted to connect to the power output terminal of the compressor, and the third first detection resistor is connected in parallel with the fourth first interlock switch. One end of the first first detection resistor is the first node, and the other end of the third first detection resistor is grounded.

4. The high-voltage interlock detection circuit according to claim 3, characterized in that, The third detection branch also includes: At least one second detection resistor, the at least one second detection resistor having a second node, each second detection resistor being connected in parallel between the two ends of the third interlock switch, and each second detection resistor having a different resistance value; The second signal detection unit is connected to the second node at its input terminal. The second signal detection unit is configured to detect the voltage signal of the second node and output a second detection value. The second control unit has its input terminal connected to the output terminal of the second signal detection unit. The second control unit is configured to determine the second resistance value based on the second detection value, determine the corresponding second detection resistance based on the second resistance value, and determine the high-voltage load corresponding to the corresponding second detection resistance as the faulty high-voltage load.

5. The high-voltage interlock detection circuit according to claim 4, characterized in that, There are two third interlock switches and two second detection resistors. The two third interlock switches are connected in series. The first third interlock switch is adapted to connect to the power input interface of the vehicle heater, and the first second detection resistor is connected in parallel with the first third interlock switch. The second third interlock switch is adapted to connect to the power input terminal of the compressor, and the second second detection resistor is connected in parallel with the second third interlock switch. One end of the first second detection resistor is the second node, and the other end of the second first detection resistor is grounded.

6. The high-voltage interlock detection circuit according to claim 5, characterized in that, The second control unit is also communicatively connected to the first control unit, and the second control unit is further configured to send a control command to the first control unit according to the second resistance value, so that the first control unit generates the first control signal and / or the second control signal according to the control command.

7. The high-voltage interlock detection circuit according to claim 4, characterized in that, The first signal detection unit and the second signal detection unit each include: A first diode, wherein the anode of the first diode is adapted to receive a preset power supply; The first resistor has one end connected to the cathode of the first diode and the other end connected to the input terminal of the corresponding signal detection unit. A first capacitor, one end of which is connected to the other end of the first resistor, and the other end of the first capacitor is grounded; The second resistor has one end connected to the other end of the first resistor, and the other end of the second resistor is the output terminal of the corresponding signal detection unit. The second capacitor has one end connected to the other end of the second resistor, and the other end of the second capacitor is grounded.

8. The high-voltage interlock detection circuit according to any one of claims 1-7, characterized in that, There are multiple second interlock switches, which are connected in series to form a third node. The second detection branch also includes: A third signal detection unit, the input terminal of which is connected to the third node, is configured to detect the voltage signal of the third node and output a third detection value. A third control unit, the input of which is connected to the output of the third signal detection unit, is configured to determine whether the battery system has malfunctioned based on the third detection value.

9. A vehicle, characterized in that, Includes a high-voltage interlock detection circuit according to any one of claims 1-8.

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