High-voltage interlocking detection circuit and vehicle

Abstract

The invention discloses a high-voltage interlocking detection circuit and a vehicle wherein the high-voltage interlocking detection circuit comprises: a first detection branch comprising at least one first interlocking switch and suitable for connecting a power electronic integration module, the first resistance values of the first detection branch being different when each first interlocking switch is disconnected, and the first resistance values of the second detection branch being different when each first interlocking switch is disconnected; determining fault high-voltage equipment in the power electronic integration module according to the first resistance value; the second detection branch comprises at least one second interlocking switch and is suitable for being connected with the battery system, and the second detection branch is configured to determine whether the battery system breaks down or not according to the electric signal of the second detection branch; and the third detection branch comprises at least one third interlocking switch, each third interlocking switch is suitable for being connected with a high-voltage load, and under the condition that each third interlocking switch is disconnected, the second resistance values of the third detection branch are different, so that the fault high-voltage load is determined according to the second resistance values. The detection circuit realizes accurate positioning of an interlocking fault position.

Description

Technical Field

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

[0002] With the increasing global attention to environmental protection and sustainable development, electric vehicles, as a new type of green transportation, have received extensive attention and development. There are more and more high-voltage electrical equipment in vehicles, and high-voltage interlock is a key link to ensure high-voltage safety. In related technologies, the high-voltage interlock is usually one-way, and there are many components involved in the interlock link. After an interlock failure occurs, it is difficult to troubleshoot the failure. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related technologies to some extent. To this end, the first object of the present invention is to propose a high-voltage interlock detection circuit, which is provided with three high-voltage interlock detection circuits. Each high-voltage interlock detection circuit independently performs high-voltage interlock detection, realizes accurate positioning of the interlock fault location, and thus can promptly troubleshoot the faulty equipment.

[0004] The second object of the present invention is to propose a vehicle.

[0005] To achieve the above object, according to an embodiment of the first aspect of the present invention, a high-voltage interlock detection circuit is provided, including: a first detection branch, including at least one first interlock switch, each first interlock switch being adapted to connect to a high-voltage device in a power electronic integration module, and when each first interlock switch is disconnected, the first resistance value of the first detection branch is different, so as to determine the faulty high-voltage device in the power electronic integration module according to the first resistance value; a second detection branch, including at least one second interlock switch, each second interlock switch being adapted to connect to a high-voltage device in a battery system, and the second detection branch is configured to determine whether a fault occurs in the battery system according to the electrical signal of the second detection branch; a third detection branch, including at least one third interlock switch, each third interlock switch being adapted to connect to a high-voltage load, and when each third interlock switch is disconnected, the second resistance value of the third detection branch is different, so as to determine the faulty high-voltage load according to the second resistance value.

[0006] The high-voltage interlock detection circuit according to an embodiment of the present invention includes a first detection branch, a second detection branch, and a third detection branch. Among them, the first detection branch includes at least one first interlock switch. Each first interlock switch is adapted to connect to a high-voltage device in a power electronics integration module. And when each first interlock switch is disconnected, the first resistance value of the first detection branch is different, so as to determine the faulty high-voltage device in the power electronics integration 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 to a high-voltage device in a battery system. The second detection branch is configured to determine whether a fault occurs in the battery system 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 to a high-voltage load. And when each third interlock switch is disconnected, the second resistance value of the third detection branch is different, so as to determine the faulty 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 performs high-voltage interlock detection independently. The number of high-voltage devices connected to each high-voltage interlock detection branch is small. And the first detection branch and the third detection branch can identify the position where the interlock switch is disconnected according to the resistance value, realizing accurate positioning of the interlock fault position, so as to timely check the faulty device.

[0007] According to an embodiment of the present invention, the first detection branch further includes: at least one first detection resistor. At least one first detection resistor has a first node. Each first detection resistor is connected in parallel between both ends of a first interlock switch. And the resistance value of each first detection resistor is different. A first signal detection unit. The input end of the first signal detection unit is connected to the first node. The first signal detection unit is configured to detect the voltage signal of the first node to output a first detection value. A first control unit. The input end of the first control unit is connected to the output end of the first signal detection unit. The first control unit 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.

[0008] According to an embodiment of the present invention, there are 4 first interlock switches and 3 first detection resistors. Among them, the 4 first interlock switches are connected in series. The first first interlock switch is adapted to connect to a DC bus input interface. The second first interlock switch is adapted to connect to an 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 a power output interface of an in-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 a power output end of a 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.

[0009] According to an embodiment of the present invention, the first detection branch further includes: a first protection device disposed between the first first interlock switch and the third first interlock switch, a control end of the first protection device is connected to a first output end of the first control unit to stop controlling the power output of the vehicle heater according to a first control signal sent by the first control unit; a second protection device disposed between the first first interlock switch and the fourth first interlock switch, a control end of the second protection device is connected to a second output end of the first control unit to stop controlling 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 a first resistance value.

[0010] According to an embodiment of the present invention, the first control unit is further configured to generate the first control signal when the first resistance value is the resistance value corresponding to the third first interlock switch; or generate the second control signal when the first resistance value is the 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 the 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 an embodiment of the present invention, the third detection branch further includes: at least one second detection resistor having a second node, each second detection resistor is connected in parallel between both ends of a third interlock switch, and the resistance values of each second detection resistor are different; a second signal detection unit, an input end of the second signal detection unit is connected to the second node, and the second signal detection unit is configured to detect a voltage signal of the second node to output a second detection value; a second control unit, an input end of the second control unit is connected to an output end of the second signal detection unit, and the second control unit is 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 faulty high-voltage load.

[0012] According to an embodiment of the present invention, there are 2 third interlock switches and 2 second detection resistors. Among them, the 2 third interlock switches are connected in series. The first third interlock switch is adapted to be connected 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 be connected 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 is the second node, and the other end of the second first detection resistor is grounded.

[0013] According to an embodiment of the present invention, 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 instruction to the first control unit according to the second resistance value, so that the first control unit generates a first control signal and / or a second control signal according to the control instruction.

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

[0015] According to an embodiment of the present invention, the first signal detection unit and the second signal detection unit respectively include: a first diode, the 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 the cathode of the first diode, and the other end of the first resistor being the 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 the output end of the corresponding signal detection unit; 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 an embodiment of the present invention, the second control unit is a central computing unit.

[0017] According to an embodiment of the present invention, the first protection device and the second protection device respectively include a relay.

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

[0019] According to an embodiment of the present invention, there are multiple second interlock switches, and the multiple second interlock switches are connected in series to form a third node. The second detection branch further includes: a third signal detection unit, an input end of the third signal detection unit is connected to the third node, and the third signal detection unit is configured to detect a voltage signal of the third node to output a third detection value; a third control unit, an input end of the third control unit is connected to an output end of the third signal detection unit, and the third control unit is configured to determine whether a failure occurs in the battery system according to the third detection value.

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

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

[0022] For the vehicle according to the embodiment of the present invention, by adopting the above high-voltage interlock detection circuit, three high-voltage interlock detection circuits are provided, and each high-voltage interlock detection circuit independently performs high-voltage interlock detection, realizing accurate positioning of the interlock fault location, so as to timely check the faulty equipment.

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

[0024] Figure 1 is a schematic structural 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 schematic structural diagram of a high-voltage interlock detection circuit according to an embodiment of the present invention;

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

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

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

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

[0031] Figure 8It is a schematic structural diagram of a vehicle according to an embodiment of the present invention. Detailed implementation manners

[0032] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

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

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

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

[0036] Based on this, the embodiments of the present invention provide a high-voltage interlock detection circuit and a vehicle, which are provided with three high-voltage interlock detection circuits. Each high-voltage interlock detection circuit independently performs high-voltage interlock detection, realizes accurate positioning of the interlock fault location, and thus can timely troubleshoot the faulty equipment.

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

[0038] Figure 3 It is a schematic structural diagram of a high-voltage interlock detection circuit according to an embodiment of the present invention. As Figure 3As shown in the figure, the high-voltage interlock detection circuit includes: a first detection branch 10, a second detection branch 20, and a third detection branch 30.

[0039] Among them, the first detection branch 10 includes at least one first interlock switch (S1, S2, S3, and S4). Each first interlock switch is adapted to connect to a high-voltage device in the power electronics integration module. And when each first interlock switch is disconnected, the first resistance value of the first detection branch 10 is different, so as to determine the faulty high-voltage device in the power electronics integration module according to the first resistance value; the second detection branch 20 includes at least one second interlock switch (S7, S8, and S9). Each second interlock switch is adapted to connect to a high-voltage device in the battery system. The second detection branch 20 is configured to determine whether a fault occurs in the battery system 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 third interlock switch is adapted to connect to a high-voltage load. And when each third interlock switch is disconnected, the second resistance value of the third detection branch 30 is different, so as to determine the faulty high-voltage load according to the second resistance value.

[0040] Specifically, the power electronics integration module in the vehicle integrates multiple devices such as a motor control unit, a DC-DC (direct current - direct current) converter, an on-vehicle charger, and an on-vehicle heater 301. Each first interlock switch is adapted to connect to a high-voltage device in the power electronics integration module. When the high-voltage devices in the power electronics integration module are all working properly, all the first interlock switches (S1, S2, S3, and S4) are in the closed state; when at least one high-voltage device in the power electronics integration module is working abnormally, at least one first interlock switch is in the open state. Since the first resistance value of the first detection branch 10 is different when different first interlock switches are disconnected, the faulty high-voltage device can be judged according to the first resistance value of the first detection branch 10.

[0041] The battery system includes an input terminal 201 for DC charging, an MSD 202 (Manual Service Disconnect), and output terminals (HV+ and HV-) of the DC bus. Each second interlock switch is adapted to connect to a high-voltage device in the battery system. When the high-voltage devices in the battery system are all working properly, all the second interlock switches (S7, S8, and S9) are in the closed state; when at least one high-voltage device in the battery system is working abnormally, at least one second interlock switch is in the open state. Since the electrical signal of the second detection branch 20 is different when at least one second interlock switch is disconnected and when all the second interlock switches are closed, it is determined whether a fault occurs in the battery system according to the electrical signal of the second detection branch 20.

[0042] The high-voltage loads include a compressor 302, a vehicle-mounted heater 301, etc. Each third interlock switch is adapted to connect to a high-voltage load. When each high-voltage load is operating normally, all the third interlock switches (S5 and S6) are in the closed state; when at least one high-voltage load is operating abnormally, at least one third interlock switch is in the open state. Since the second resistance value of the third detection branch 30 is different when different third interlock switches are open, 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. The high-voltage devices connected to each high-voltage interlock detection branch are fewer. Moreover, the first detection branch and the third detection branch can identify the position where the interlock switch is open according to the resistance value, realizing accurate positioning of the interlock fault position, so as to timely check the faulty device.

[0044] In some embodiments, as Figure 3 and Figure 4 shown, 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. Among them, 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 a first interlock switch, and the resistance values of each first detection resistor are different; 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 a 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 integration module are operating normally, all the first detection resistors (Rs1, Rs2, and Rs3) are short-circuited; when at least one high-voltage device in the power electronic integration module is operating abnormally, at least one first detection resistor is short-circuited. Since the resistance values of each first detection resistor are 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 use 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 may not be provided.

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

[0048] It can be understood that since the first detection branch 10 detects the high-voltage devices in the power electronic integration module, and the power electronic integration module integrates a motor control unit, therefore, the motor control unit can be used for high-voltage interlock detection.

[0049] In the above embodiments, by connecting 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. The first control unit determines the first detection resistor of the access resistor according to the voltage signal of the first node. In this way, the position where the first interlock switch is disconnected can be quickly identified, and the high-voltage device corresponding to the corresponding first detection resistor can be determined as the faulty high-voltage device, realizing accurate positioning of the faulty high-voltage device.

[0050] In some embodiments, as Figure 3 and Figure 4 shown, there are 4 first interlock switches and 3 first detection resistors. Among them, the 4 first interlock switches (S1, S2, S3, and S4) are connected in series. The first first interlock switch S1 is adapted to connect to the DC bus input interface (HV+ and HV-), the second first interlock switch S2 is adapted to connect to 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 to the power output interface of the vehicle 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 to the power output terminal 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 first interlock switch S1 is disconnected, the vehicle cannot be powered on at high voltage. Therefore, the vehicle cannot operate normally. When the second first interlock switch S2 is disconnected, the first control unit 12 detects that the detection resistor connected to the circuit is the first first detection resistor Rs1. When the third first interlock switch S3 is disconnected, the first control unit 12 detects that the detection resistor connected to the circuit is the second first detection resistor Rs2. When the fourth first interlock switch S4 is disconnected, the first control unit 12 detects that the detection resistor connected to the circuit is the third first detection resistor Rs3. When the third first interlock switch S3 and the fourth first interlock switch S4 are both disconnected, the first control unit 12 detects that the detection resistor connected to the circuit is the sum of the second first detection resistor Rs2 and the third first detection resistor Rs3.

[0052] In some embodiments, as Figure 3 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, and the control end of the first protection device is connected to the first output end 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, and the control end of the second protection device is connected to the second output end 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 according to the first resistance value.

[0053] Specifically, the power electronic integration module is adapted to supply power to the vehicle heater 301 through the power output interface of the vehicle heater 301 and supply power to the compressor 302 through the power output terminal of the compressor 302. When the vehicle heater 301 is operating normally, the first protection device does not interfere with the operation of the vehicle heater 301. However, when a fault occurs in the vehicle heater 301, the third first interlock switch S3 is disconnected, the first resistance value changes, the first control unit 12 generates a first control signal according to the first resistance value, and the first protection device stops supplying power to the vehicle heater 301 according to the first control signal. Similarly, when the compressor 302 is operating normally, the first protection device does not interfere with the operation of the compressor 302. However, when a fault occurs in the compressor 302, the fourth first interlock switch S4 is disconnected, the first resistance value changes, the first control unit 12 generates a second control signal according to the first resistance value, and the second protection device stops supplying power to the compressor 302 according to the second control signal.

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

[0055] Taking Figure 3 shown as an example, 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, 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 pole 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, 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 pole of the power output terminal 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, and the coil of the first relay Relay1 drives the switch of the first relay Relay1 to close to supply power to the vehicle heater 301; when the third first interlock switch S3 is opened, the control unit outputs a low-level signal to the coil of the first relay Relay1, and the coil of the first relay Relay1 drives the switch of the first relay Relay1 to open to stop supplying power 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, and the coil of the second relay Relay2 drives the switch of the second relay Relay2 to close to supply power to the compressor 302; when the fourth first interlock switch S4 is opened, the control unit outputs a low-level signal to the coil of the second relay Relay2, and the coil of the second relay Relay2 drives the switch of the second relay Relay2 to open to stop supplying power to the compressor 302.

[0056] It should be noted that the first protection device and the second protection device are not limited to using relays, and other controllable switch devices can also be used, which are not specifically limited here.

[0057] In the above embodiment, after the first detection branch detects the interlock switch fault position according to the first resistance value, it controls the first protection device and the second protection device according to the first resistance value to disconnect the power output of the corresponding high-voltage equipment to cut off the faulty high-voltage equipment, which can not only ensure the electrical safety of the vehicle, but also will 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 value corresponding to the third first interlock switch S3 and the resistance value corresponding to the fourth first interlock switch S4.

[0059] It can be understood that 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. 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. Therefore, the control unit generates a second control signal; when the first resistance value is the sum of the resistance value corresponding to the third first interlock switch S3 and the resistance value corresponding to 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. Therefore, the control unit generates a first control signal and a second control signal.

[0060] In some embodiments, as Figure 3 and Figure 5 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. Wherein, 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 values of each second detection resistor are different; the input end 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 end of the second control unit 32 is connected to the output end of the second signal detection unit 31, and the second control unit 32 is 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 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 the same as 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 operating 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. Because the resistance values of each second detection resistor are different, the voltage signal at the second node J2 is also different. The second control unit 32 can determine which second detection resistor is connected to the circuit based on the voltage signal at the second node J2, and then regard the high-voltage load corresponding to the second detection resistor connected to the circuit as the faulty 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, and the central computing unit is a key component in an intelligent connected vehicle, mainly responsible for providing sufficient computing power to support the relevant business logics of intelligent driving and intelligent cockpits, therefore, the central computing unit can be used for high-voltage interlock detection.

[0064] In the above embodiments, 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. The second control unit determines the second detection resistor with the connected resistor based on the voltage signal at the second node, so that the position where the third interlock switch is open can be quickly identified, and the high-voltage load corresponding to the corresponding second detection resistor is determined as the faulty high-voltage load, realizing accurate positioning of the faulty high-voltage load.

[0065] In some embodiments, as Figure 3 and Figure 5 shown, there are 2 third interlock switches and 2 second detection resistors. Among them, the 2 third interlock switches (S5 and S6) are connected in series. The first third interlock switch S5 is adapted to connect to 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 to 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, when the first third interlock switch S5 is disconnected, the second control unit 32 detects that the detection resistance of the access circuit is the first second detection resistance Rs4; when the second third interlock switch S6 is disconnected, the second control unit 32 detects that the detection resistance of the access circuit is the second second detection resistance Rs2; when the first third interlock switch S5 and the second third interlock switch S6 are both disconnected, 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 to 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 a first control signal and / or a 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, it also generates a control instruction according to the second resistance value, and the first control unit 12 generates a first control signal and / or a 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 faulty high-voltage load.

[0069] Specifically, the second control unit 32 is further configured to generate a first control instruction when the second resistance value is the resistance value corresponding to the first third interlock switch S5, and send the first control instruction to the first control unit 12, so that the first control unit 12 generates a first control signal according to the first control instruction; or generate a second control instruction when the second resistance value is the resistance value corresponding to the second third interlock switch S6, and send the second control instruction to the first control unit 12, so that the first control unit 12 generates a second control signal according to the second control instruction; or generate a third control instruction 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, and send the third control instruction to the first control unit 12, so that the first control unit 12 generates a first control signal and a 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 turned off, indicating that the vehicle-mounted charger has a fault. The first protection device is used to control the power supply of the vehicle-mounted 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 vehicle-mounted 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 turned off, indicating that the compressor 302 has a fault. 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 vehicle-mounted heater 301 and the compressor 302 have faults. 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 vehicle-mounted 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 the second control unit detects the fault position of the interlock switch according to the second resistance value, it 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 and cut off the faulty high-voltage load, thereby improving the safety of the vehicle.

[0072] In some embodiments, as Figure 6 shown, the first signal detection unit 11 and the second signal detection unit 31 respectively include: a first diode D1, a first resistor R1, a first capacitor C1, a second resistor R2, and a second capacitor C2. Among them, the anode of the first diode D1 is adapted to input a preset power supply 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. Therefore, the voltage division method 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. Therefore, the voltage division method 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 methods of the first signal detection unit and the second signal detection unit change, and the voltage signals output by the first signal detection unit and the second signal detection unit change. Therefore, the first control unit and the second control unit can calculate the corresponding resistance values.

[0075] In some embodiments, as Figure 3 and Figure 7 shown, there are multiple second interlock switches, and the multiple second interlock switches (S7, S8, and S9) are connected in series to form a third node J3. The second detection branch 20 further includes: 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, and 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 a fault occurs in the battery system according to the third detection value.

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

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

[0078] Specifically, when the first second interlock switch S7 is open and / or the third second interlock switch S9 is open, the vehicle cannot be powered on with high voltage, the third control unit 22 is not powered on, and detection cannot be performed. Therefore, when the third control unit 22 can detect a change in the third detection value, the third control unit 22 can determine that a DC charging failure has occurred.

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

[0080] It can be understood that since the second detection branch 20 detects the battery system, the third control unit 22 can be a battery management system. In this way, the first control unit 12, the second control unit 32, and the third control unit 22 are respectively different detection entities. When any one of the detection entities is damaged, it will not affect the normal operation of other detection entities, thereby further improving the safety of the vehicle.

[0081] In summary, according to the high-voltage interlock detection circuit of the embodiment of the present invention, it includes a first detection branch, a second detection branch, and a third detection branch. Among them, the first detection branch includes at least one first interlock switch, and each first interlock switch is adapted to connect to one high-voltage device in the power electronics integration module. And when each first interlock switch is open, the first resistance value of the first detection branch is different, so as to determine the faulty high-voltage device in the power electronics integration module according to the first resistance value; the second detection branch includes at least one second interlock switch, and each second interlock switch is adapted to connect to one high-voltage device in the battery system. The second detection branch is configured to determine whether a failure has occurred in the battery system according to the electrical signal of the second detection branch; the third detection branch includes at least one third interlock switch, and each third interlock switch is adapted to connect to one high-voltage load. And when each third interlock switch is open, the second resistance value of the third detection branch is different, so as to determine the faulty 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 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 where the interlock switch is open according to the resistance value, realizing accurate positioning of the interlock fault position, so as to timely check the faulty device.

[0082] Corresponding to the above embodiments, an embodiment of the present invention also provides a vehicle. As Figure 8As shown, vehicle 1000 includes the high-voltage interlock detection circuit 100 of any of the foregoing embodiments.

[0083] For a vehicle according to an embodiment of the present invention, by adopting the above high-voltage interlock detection circuit and setting up three high-voltage interlock detection circuits, each high-voltage interlock detection circuit independently performs high-voltage interlock detection, realizing accurate positioning of the interlock fault location, so as to timely check the faulty equipment.

[0084] It should be understood that each part of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following technologies well known in the art can be used: discrete logic circuits with logic gate circuits for implementing logical functions on data signals, application-specific integrated circuits with appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0085] In the description of this specification, the descriptions referring to terms such as "an embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean 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 invention. In this specification, the schematic representations of the above terms do 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 invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0087] In addition, the terms "first", "second", etc. used in the embodiments of the present invention are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features indicated in this embodiment. Thus, the features defined with the terms "first", "second", etc. in the embodiments of the present invention may clearly or implicitly indicate that at least one such feature is included in this embodiment. In the description of the present invention, the meaning of the word "plural" is at least two or more, such as two, three, four, etc., unless otherwise specifically defined in the embodiment.

[0088] In the present invention, unless otherwise clearly specified or limited in the embodiments, the terms "mounted", "connected", "coupled" and "fixed" etc. appearing in the embodiments shall be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or integrated; it can be understood as a mechanical connection, an electrical connection, etc.; of course, it can also be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside 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 present invention can be understood according to the specific implementation circumstances.

[0089] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0090] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A high voltage interlock detection circuit, characterized in that: include: a first detection branch, comprising at least one first interlock switch, each of which is suitable for connecting a high-voltage device in the power electronic integrated module, and when each of the first interlock switches is disconnected, a first resistance value of the first detection branch is different, so as to determine a 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 of the second interlock switches being adapted to be connected to a high-voltage device in the battery system, the second detection branch being configured to determine whether a fault occurs in the battery system according to an electrical signal of the second detection branch; The third detection branch includes at least one third interlock switch, each of which is suitable for connecting a high-voltage load, and when each of the third interlock switches is disconnected, the second resistance value of the third detection branch is different, so as to determine the faulty high-voltage load according to the second 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 of the first detection resistors is connected in parallel between two ends of one of the first interlock switches, and each of the first detection resistors has a different resistance value; a first signal detection unit, wherein an input terminal of the first signal detection unit 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; A first control unit, wherein an input end of the first control unit 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 the faulty high-voltage device.

3. The high voltage interlock detection circuit according to claim 2, characterized in that: There are 4 first interlock switches and 3 first detection resistors, wherein the 4 first interlock switches are connected in series, the first first interlock switch is suitable for connecting the DC bus input interface, the second first interlock switch is suitable for connecting 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 suitable for connecting 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 suitable for connecting the power output end 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 first detection branch also includes: a first protection device, the first protection device being arranged between the first first interlock switch and the third first interlock switch, wherein a control end of the first protection device is connected to a first output end of the first control unit to stop controlling the power output of the vehicle heater according to a first control signal sent by the first control unit; A second protection device, the second protection device is arranged between the first first interlock switch and the fourth first interlock switch, and the control end of the second protection device is connected to the second output end of the first control unit to stop controlling 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.

5. The high voltage interlock detection circuit according to claim 4, 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 of the second detection resistors is connected in parallel between two ends of one of the third interlock switches, and each of the second detection resistors has a different resistance value; a second signal detection unit, wherein an input terminal of the second signal detection unit is connected to the second node, and the second signal detection unit is configured to detect a voltage signal of the second node to output a second detection value; A second control unit, wherein an input end of the second control unit is connected to an output end of the second signal detection unit, and the second control unit is configured to determine the 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 the faulty high-voltage load.

6. The high voltage interlock detection circuit according to claim 5, characterized in that: There are two third interlock switches and two second detection resistors, wherein the two third interlock switches are connected in series, the first third interlock switch is suitable for connecting 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 suitable for connecting to the 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 is the second node, and the other end of the second first detection resistor is grounded.

7. The high voltage interlock detection circuit according to claim 6, 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 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.

8. The high voltage interlock detection circuit according to claim 5, characterized in that: The first signal detection unit and the second signal detection unit respectively include: a first diode, wherein an anode of the first diode is suitable for inputting a preset power supply; a first resistor, one end of the first resistor being connected to the cathode of the first diode, and the other end of the first resistor being an input end of a corresponding signal detection unit; A first capacitor, one end of the first capacitor is connected to the other end of the first resistor, and the other end of the first capacitor is 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 a corresponding signal detection unit; A second capacitor, one end of the second capacitor is connected to the other end of the second resistor, and the other end of the second capacitor is grounded.

9. The high voltage interlock detection circuit according to any one of claims 1 to 8, characterized in that: There are a plurality of second interlock switches, and the plurality of second interlock switches are connected in series to form a third node. The second detection branch further includes: a third signal detection unit, wherein an input terminal of the third signal detection unit is connected to the third node, and the third signal detection unit is configured to detect a voltage signal of the third node to output a third detection value; A third control unit, wherein an input end of the third control unit is connected to an output end of the third signal detection unit, and the third control unit is configured to determine whether a fault occurs in the battery system according to the third detection value.

10. A vehicle, characterized in that: The invention comprises a high voltage interlock detection circuit according to any one of claims 1 to 9.

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