High-low voltage interlocking control circuit and electric vehicle

Abstract

The invention relates to a high-low voltage interlocking control circuit and an electric vehicle, the high-low voltage interlocking control circuit comprises a high-voltage interlocking control circuit and a low-voltage interlocking control circuit, and the high-voltage interlocking control circuit responds to common input of a first detection signal and a first voltage and is in a closed state, so that a high-voltage power supply outputs a second voltage to a high-voltage loop. The low-voltage interlock control circuit responds to the common input of the second voltage and the first voltage, is in an on state and outputs a first enable signal, so that the low-voltage loop is in a power-on state. Only when the high-voltage plug and the low-voltage plug are effectively inserted into the corresponding plugs, the high-voltage loop and the low-voltage loop can be powered on, the safety of the electric vehicle is improved, meanwhile, the high-voltage and low-voltage interlocking circuit is a hardware circuit, the response speed is high, and the safety of the electric vehicle is further improved.

Description

Technical Field

[0001] The present application relates to the field of electric vehicles, and in particular to a high-low voltage interlocking control circuit and an electric vehicle. Background Art

[0002] Electric vehicles include a high-voltage interlock circuit. High-voltage interlock (HVIL) is a safety design method that uses low-voltage signals to monitor the integrity of high-voltage interface circuits. If the high-voltage or low-voltage plugs are not properly connected, it may cause control anomalies or thermal runaway, compromising the safety of the electric vehicle.

[0003] The current high-voltage interlock circuit adopts software control, which may cause the interlock control circuit to fail, and then cause safety problems due to the lack of interlock. Summary of the Invention

[0004] The embodiments of the present application aim to provide a high-low voltage interlocking control circuit and an electric vehicle, which can ensure that the high-voltage load can be driven to work when the high- and low-voltage plugs are effectively inserted into the low-voltage sockets, thereby improving the safety of the electric vehicle.

[0005] To solve the above technical problems, the embodiments of the present application provide the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a high-low voltage interlock control circuit, which is applied to an electric vehicle, wherein the electric vehicle includes a high-voltage plug, a high-voltage circuit, a low-voltage plug, and a low-voltage circuit, wherein the high-voltage circuit is electrically connected to the high-voltage plug and the high-voltage load, respectively, and the high-voltage circuit is also communicatively connected to the low-voltage circuit. If the high-voltage plug is effectively inserted into a high-voltage socket, the high-voltage plug is used to connect the electrical connection between the high-voltage power supply and the high-voltage circuit and output a first detection signal. The low-voltage plug is electrically connected to the low-voltage circuit. If the low-voltage plug is effectively inserted into a low-voltage socket, the low-voltage plug is used to connect the electrical connection between the low-voltage power supply and the low-voltage circuit and output a first voltage.

[0007] The high and low voltage interlocking control circuit includes: a high voltage interlocking control circuit and a low voltage interlocking control circuit;

[0008] The high-voltage interlock control circuit is electrically connected to the high-voltage circuit, and the low-voltage interlock control circuit is electrically connected to the low-voltage circuit. The high-voltage interlock control circuit is used to respond to the common input of the first detection signal and the first voltage, and is in a path state, so that the high-voltage power supply outputs a second voltage to the high-voltage circuit, and the high-voltage circuit is in a power-on state, and the low-voltage interlock control circuit is used to respond to the common input of the second voltage and the first voltage, and is in a path state and outputs a first enable signal, so that the low-voltage power supply supplies power to the low-voltage circuit, and the low-voltage circuit is in a power-on state, and then the low-voltage circuit transmits a control instruction to the high-voltage circuit, and the high-voltage circuit responds to the input of the control instruction to drive the high-voltage load to work.

[0009] In some embodiments, the high-voltage interlock control circuit includes a signal generating unit and a power distribution unit, the signal generating unit is electrically connected to the power distribution unit, and the power distribution unit is electrically connected to the high-voltage circuit;

[0010] The signal generating unit is configured to generate a first control signal in response to a common input of the first detection signal and the first voltage;

[0011] The power distribution unit is configured to respond to input of the first control signal and be in a conduction state, so that the high-voltage power supply outputs the second voltage to the high-voltage circuit.

[0012] In some embodiments, the signal generating unit includes a first switch unit and a second switch unit, wherein the first switch unit and the second switch unit are connected in series between the control terminal of the power distribution unit and the power ground;

[0013] The first switch unit is configured to be in a conducting state in response to input of the first detection signal;

[0014] The second switch unit is configured to be in an on state in response to input of the first voltage;

[0015] When the first switch unit and the second switch unit are both in the on state, the control end of the power distribution unit receives the first control signal.

[0016] In some embodiments, the signal generating unit further comprises an isolation unit;

[0017] The isolation unit is electrically connected to the second switch unit, and the isolation unit is configured to output a conduction signal to the second switch unit in response to input of the first voltage.

[0018] In some embodiments, the power distribution unit includes a MOS tube, a first resistor and a second resistor;

[0019] The first resistor is connected in series between the gate of the MOS transistor and the source of the MOS transistor. The gate of the MOS transistor is also connected to one end of the second resistor. The other end of the second resistor is electrically connected to the first switch unit. The MOS transistor is connected in series to the high-voltage circuit, and the source of the MOS transistor is used to access a high-voltage power supply. The drain of the MOS transistor is used to output the second voltage.

[0020] In some embodiments, the first switch unit includes a first transistor, a third resistor, and a fourth resistor;

[0021] One end of the third resistor is used to access the first detection signal, the other end of the third resistor is connected to the base of the first transistor, the emitter of the first transistor is connected to the control end of the distribution unit, the collector of the first transistor is electrically connected to the second switching unit, and the fourth resistor is connected in series between the emitter and base of the first transistor.

[0022] In some embodiments, the second switch unit includes a second transistor, a fifth resistor, and a sixth resistor;

[0023] One end of the fifth resistor is used to connect to the first voltage, the other end of the fifth resistor is connected to the base of the second transistor, the emitter of the second transistor is connected to the power ground, the collector of the second transistor is electrically connected to the collector of the first transistor, and the sixth resistor is connected in series between the emitter and the base of the second transistor.

[0024] In some embodiments, the isolation unit includes a first photoelectric isolator, a seventh resistor, and an eighth resistor;

[0025] One end of the seventh resistor is connected to a DC power supply, the other end of the seventh resistor is connected to the collector of the transistor of the first photoelectric isolator, the emitter of the transistor of the first photoelectric isolator is electrically connected to the second switch unit, one end of the eighth resistor is used to access the first voltage, the other end of the eighth resistor is connected to the anode of the diode of the first photoelectric isolator, and the cathode of the diode of the first photoelectric isolator is connected to the signal ground.

[0026] In some embodiments, the low voltage interlock control circuit includes a second optoelectronic isolator, a ninth resistor, a tenth resistor, and an eleventh resistor;

[0027] One end of the ninth resistor is used to access the second voltage, the other end of the ninth resistor is connected to the anode of the diode of the first photoelectric isolator, and the cathode of the diode of the first photoelectric isolator is connected to the power ground. One end of the tenth resistor is used to access the first voltage, the other end of the tenth resistor is connected to the collector of the transistor of the second photoelectric isolator, and the emitter of the transistor of the second photoelectric isolator is electrically connected to one end of the eleventh resistor and the low-voltage circuit respectively, and the other end of the eleventh resistor is connected to the signal ground.

[0028] In a second aspect, an embodiment of the present application provides an electric vehicle, comprising a high-voltage plug, a low-voltage plug, a high-voltage circuit, a low-voltage circuit, and the high- and low-voltage interlocking control circuit as described above, wherein the high-voltage circuit is electrically connected to the high-voltage plug and the high-voltage load, respectively, and the high-voltage circuit is also communicatively connected to the low-voltage circuit. If the high-voltage plug is effectively inserted into the high-voltage socket, the high-voltage plug is used to connect the electrical connection between the high-voltage power supply and the high-voltage circuit and output the first detection signal. The low-voltage plug is electrically connected to the low-voltage circuit. If the low-voltage plug is effectively inserted into the low-voltage socket, the low-voltage plug is used to connect the electrical connection between the low-voltage power supply and the low-voltage circuit and output the first voltage.

[0029] The high-low voltage interlock control circuit is used to control the high-voltage circuit and the low-voltage circuit to be in an energized state when the high-voltage plug is effectively inserted into the high-voltage socket and the low-voltage plug is effectively inserted into the low-voltage socket, so that the low-voltage circuit sends a control instruction to the high-voltage circuit, and then the high-voltage circuit responds to the input of the control instruction to drive the high-voltage load to work.

[0030] In various embodiments of the present application, when the high-voltage plug is effectively inserted into the high-voltage socket, the high-voltage plug outputs a first detection signal, and when the low-voltage plug is effectively inserted into the low-voltage socket, the low-voltage plug outputs a first voltage, and the high-low voltage interlock control circuit includes a high-voltage interlock control circuit and a low-voltage interlock control circuit, wherein the high-voltage interlock control circuit is electrically connected to the high-voltage circuit, and the low-voltage interlock control circuit is electrically connected to the low-voltage circuit, and the high-voltage interlock control circuit is in a conductive state in response to the common input of the first detection signal and the first voltage, so that the high-voltage power supply outputs a second voltage to the high-voltage circuit, and the high-voltage circuit is in an energized state. The low-voltage interlock control circuit is in a conductive state in response to the common input of the second voltage and the first voltage and outputs a first enable signal, so that the low-voltage circuit is in an energized state.

[0031] Therefore, only when the high-voltage plug is effectively inserted into the high-voltage socket and the low-voltage plug is also effectively inserted into the low-voltage socket, can the high-voltage interlock control circuit receive the common input of the first detection signal and the first voltage, and then the high-voltage circuit can be energized, and the low-voltage interlock control circuit can receive the common input of the second voltage and the first voltage, and then the low-voltage circuit can be energized. Only when the high-voltage circuit and the low-voltage circuit are energized together can the high-voltage load be driven to work, ensuring that the high-voltage load works when the high-voltage plug and the low-voltage plug are both effectively plugged in, avoiding safety problems caused by loose connection of the high-voltage plug or the low-voltage plug, and improving the safety of the electric vehicle. At the same time, the high-low voltage interlock circuit is a hardware circuit with a fast response speed, further improving the safety of the electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0033] Figure 1 This is a schematic structural diagram of one of the electric vehicles provided in the embodiments of the present application;

[0034] Figure 2 This is a schematic structural diagram of a high-voltage interlock control circuit provided in an embodiment of the present application;

[0035] Figure 3 This is a schematic structural diagram of a high-voltage interlock control circuit provided in an embodiment of the present application;

[0036] Figure 4 This is a circuit structure diagram of one of the high and low voltage interlocking control circuits provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0038] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of an electric vehicle provided in an embodiment of the present application. Figure 1As shown, the electric vehicle includes a high-voltage plug, a low-voltage plug, a high-voltage circuit 100, and a low-voltage circuit 200. If the high-voltage plug is effectively plugged in, that is, the high-voltage plug is effectively inserted into the high-voltage socket (the high-voltage plug is fully inserted into the high-voltage socket and has good contact), the high-voltage plug connects the electrical connection between the high-voltage power supply and the high-voltage circuit, and the high-voltage power supply is high-voltage AC power. If the low-voltage plug is effectively inserted into the low-voltage socket (the low-voltage plug is fully inserted into the low-voltage socket and has good contact), the low-voltage plug connects the electrical connection between the low-voltage power supply and the low-voltage circuit, and the low-voltage power supply is low-voltage DC power.

[0039] The high-voltage circuit 100 is communicatively connected to the low-voltage circuit 200, and the high-voltage circuit 100 is electrically connected to the high-voltage load. When the low-voltage circuit 200 is energized, control instructions are transmitted to the high-voltage circuit 100. When the high-voltage circuit 100 is energized, it responds to the control instructions sent by the low-voltage circuit 200 to drive the high-voltage load to work.

[0040] Therefore, only when the high-voltage plug is effectively plugged in, the low-voltage plug is effectively plugged in, and both the high-voltage circuit 100 and the low-voltage circuit 200 are in the energized state, can the control instructions be transmitted normally between the high-voltage circuit 100 and the low-voltage circuit 200, and the high-voltage circuit 100 can drive the high-voltage load to work.

[0041] High-voltage loads refer to loads in electric vehicles that require high-voltage power supply, such as air-conditioning compressors, drive motors, and on-board chargers. Figure 1 The high-voltage load is shown as an air-conditioning compressor as an example.

[0042] like Figure 1 As shown, the high-voltage circuit 100 includes an AC / DC power converter, a voltage-stabilized power supply, a relay circuit, an MCU, and a compressor drive unit. If the high-voltage plug is effectively plugged in and the AC / DC power converter is electrically connected to the voltage-stabilized power supply, the high-voltage plug connects the high-voltage power supply, which is high-voltage alternating current. The AC / DC power converter then converts the high-voltage alternating current into high-voltage direct current. After the voltage-stabilized power supply stabilizes the high-voltage direct current, it outputs high-voltage stabilized power to the MCU, and the MCU is powered on and starts working.

[0043] After the MCU is powered on, it sends a drive signal to the relay circuit through port PO1. This drives the relay circuit, which includes transistor N1 and relay K1. The drive signal turns on transistor N1, and high-voltage DC power is supplied to the coil of relay K1. This energizes the coil, closing the contacts of relay K1. The high-voltage power supply then supplies high voltage to the compressor drive unit, powering it up.

[0044] The low-voltage circuit 200 includes a DC-DC power converter and a CAN communication processor. The positive input terminal of the DCDC power converter is connected to the positive terminal of the low-voltage power supply, the negative input terminal of the DCDC power converter is connected to the signal ground SGND, the positive output terminal of the DCDC power converter outputs the supply voltage of the CAN communication processor, the negative output terminal of the DCDC power converter is connected to the signal ground SGND, and the enable terminal of the DCDC power converter is connected to the enable signal. The DCDC power converter is activated and the step-down function is enabled. If the low-voltage plug is effectively plugged in, the low-voltage plug connects the low-voltage power supply, which is low-voltage direct current. The DCDC power converter steps down the low-voltage power supply to obtain the supply voltage of the CAN communication processor. This supply voltage powers the CAN communication processor, and the CAN communication processor is in a powered-on state, allowing the CAN communication processor to operate normally. The CAN communication processor is also known as the CAN controller, which is a key component of the CAN bus communication protocol. The CAN communication processor is mainly used for information filtering, processing information frames, and error detection and correction.

[0045] If the low-voltage plug is effectively connected and the CAN communication processor is in a powered-on state, the CAN communication processor is normally communicated with the on-board controller, and the CAN communication processor receives the control command sent by the on-board controller.

[0046] The CAN communication processor and MCU use isolated communication technology to ensure signal and power isolation between the CAN communication processor and the MCU, preventing electrical noise on the CAN bus from affecting the normal operation of the MCU and other devices. The isolated communication connection can avoid ground loop problems through electrical isolation and provide protection against surge damage.

[0047] The CAN communication processor transmits the control command to the MCU. After receiving the control command, the MCU drives and controls the compressor drive unit to drive the electric compressor to work, so that the on-board controller can control the speed and start and stop of the electric compressor through the CAN communication processor.

[0048] Therefore, when the high-voltage plug is effectively inserted into the high-voltage socket and the low-voltage plug is effectively inserted into the low-voltage socket, the high-voltage circuit 100 is powered on and the low-voltage circuit 200 is powered on, and the high-voltage load is driven. If either plug is invalidly plugged in, it may cause control abnormality or thermal runaway, resulting in lower safety of the electric vehicle. To ensure safety, electric vehicles include high- and low-voltage interlocking circuits, but the current high- and low-voltage interlocking circuits are controlled by software, which may cause the interlocking control circuit to fail, and then cause safety problems due to the lack of interlocking. In addition, the response speed is slow and the safety is low.

[0049] Based on the above problems, an embodiment of the present application provides a high-low voltage interlocking control circuit, which is applied to electric vehicles. The high-low voltage interlocking control circuit ensures that when any plug is invalidly plugged in, neither the high-voltage circuit 100 nor the low-voltage circuit 200 can be powered on, preventing the high-voltage load from being driven, improving safety, and having a faster response speed and higher safety.

[0050] Please continue reading Figure 1 The high-low voltage interlocking control circuit includes a high-voltage interlocking control circuit 10 and a low-voltage interlocking control circuit 20, wherein the high-voltage interlocking control circuit 10 is electrically connected to the high-voltage circuit 100, and the low-voltage interlocking control circuit 20 is electrically connected to the low-voltage circuit 200. In the embodiment of the present application, the high-voltage interlocking control circuit 10 is electrically connected to the ACDC power converter and the regulated power supply respectively as an example, and the low-voltage interlocking control circuit 20 is electrically connected to the DCDC power converter as an example.

[0051] When the high-voltage plug is effectively inserted into the high-voltage socket, pin 1 of the high-voltage plug is the positive pole of the high-voltage power supply, pin 2 is the negative pole of the high-voltage power supply, pin 3 and pin 4 of the high-voltage plug are connected, wherein pin 4 of the high-voltage plug is connected to the power ground, and pin 3 of the high-voltage plug outputs a first detection signal, and the first detection signal is a low-level signal.

[0052] When the low-voltage plug is effectively inserted into the low-voltage socket, pins 1 and 2 of the low-voltage plug are used to communicate with the vehicle controller, pin 3 of the low-voltage plug is the positive pole of the low-voltage power supply, and pin 4 of the low-voltage plug is the negative pole of the low-voltage power supply. Therefore, pin 3 of the low-voltage plug outputs a first voltage V1, which is the voltage of the low-voltage power supply.

[0053] The high-voltage interlock control circuit 10 responds to the common input of the first detection signal HIVL1 and the first voltage V1, and is in a conductive state, thereby connecting the electrical connection between the high-voltage power supply and the high-voltage circuit 100, and the high-voltage power supply outputs the second voltage V2 to the high-voltage circuit 100, so that the high-voltage circuit 100 is in a powered-on state. In other cases, the high-voltage interlock control circuit 10 is in an open-circuit state, and the high-voltage interlock control circuit 100 disconnects the electrical connection between the high-voltage power supply and the high-voltage circuit 100, so that the high-voltage circuit 100 is powered-off.

[0054] The voltage of the high-voltage power supply is converted into a second voltage V2 by the ACDC power converter. The second voltage V2 is high-voltage direct current. The second voltage V2 is output to the voltage-stabilized power supply. After the voltage-stabilized power supply stabilizes the second voltage V2, it outputs high-voltage regulated power to the MCU. The MCU is powered on and starts working. The transistor N1 is turned on, the coil of the relay K1 is energized, and the contacts of the relay K1 are closed. Thus, the high-voltage power supply provides high-voltage power to the compressor drive unit. The compressor drive unit is powered on, that is, the high-voltage circuit 100 is in the energized state. If the high-voltage interlock control circuit 10 disconnects the electrical connection between the high-voltage power supply and the voltage-stabilized power supply, the high-voltage power supply cannot output the second voltage V2 through the high-voltage interlock control circuit 10. There is no power input at the voltage-stabilized power supply, and it cannot supply power to the MCU. The MCU is powered off, and then the compressor drive unit is powered off. Then, the high-voltage circuit 100 is powered off and cannot operate normally.

[0055] Therefore, only when the first detection signal HIVL1 and the first voltage V1 are both input to the high-voltage interlock control circuit 10 can the high-voltage power supply output the second voltage V2 through the high-voltage interlock control circuit 10, and the high-voltage circuit 100 can be in a powered-on state. In other cases, such as when only the first detection signal HIVL1 or the first voltage V1 is input to the high-voltage interlock control circuit 10, the high-voltage circuit 100 is in a powered-off state.

[0056] The low voltage interlock control circuit 20 responds to the common input of the second voltage V2 and the first voltage V1, is in a conduction state and outputs a first enable signal, so that the low voltage circuit 200 is in a power-on state. In other cases, the low voltage interlock control circuit 20 does not output the first enable signal, and the low voltage circuit 200 is powered off.

[0057] Only when the high-voltage plug is effectively inserted into the high-voltage socket and the low-voltage plug is effectively inserted into the low-voltage socket, can the high-voltage power supply output the second voltage V2 through the high-voltage interlock control circuit 10, and the low-voltage power supply output the first voltage V1, so that the low-voltage interlock control circuit 20 can output the first enable signal. The first enable signal drives the DCDC power converter to work, and the DCDC power converter converts the first voltage V1 into a step-down voltage to obtain the power supply voltage of the CAN communication processor. The power supply voltage powers the CAN communication processor, and the CAN communication processor is powered on and starts to work normally. In other cases, if the high-voltage power supply cannot output the second voltage V2 through the high-voltage interlock control circuit 10, or the low-voltage power supply cannot output the first voltage V1, then there is no first enable signal to drive the DCDC power converter, the DCDC power converter cannot work normally, and the CAN communication processor cannot be powered, the low-voltage circuit 200 is powered off, and cannot work normally.

[0058] Therefore, only when the high-voltage plug is effectively inserted into the high-voltage socket and the low-voltage plug is effectively inserted into the low-voltage socket, can the high-voltage interlock control circuit 10 receive the common input of the first detection signal HIVL1 and the first voltage V1, and then the high-voltage circuit 100 can be energized, and the low-voltage interlock control circuit 20 can receive the common input of the second voltage V2 and the first voltage V1, and then the low-voltage circuit 200 can be energized. The high-voltage circuit 100 and the low-voltage circuit 200 must be energized together to drive the high-voltage load to work, ensuring that the high-voltage load works when the high-voltage plug and the low-voltage plug are both effectively plugged in, avoiding safety problems caused by loose plugging of the high-voltage plug or the low-voltage plug, and improving the safety of the electric vehicle. At the same time, the high-low voltage interlock circuit is a hardware circuit with a fast response speed, further improving the safety of the electric vehicle.

[0059] See also Figure 2 , Figure 2 : is a structural diagram of a high and low voltage interlocking control circuit provided by an embodiment of the present application, such as Figure 2 As shown, the high-voltage interlock control circuit 10 includes a signal generating unit 11 and a power distribution unit 12, the signal generating unit 11 is electrically connected to the power distribution unit 12, and the power distribution unit 12 is electrically connected to the high-voltage circuit 100, as shown in FIG. Figure 1 As shown in FIG, the power distribution unit 12 can be electrically connected to the ACDC power converter and the regulated power supply respectively.

[0060] The first detection signal HIVL1 and the first voltage V1 are both input to the signal generating unit 11 , and the signal generating unit 11 generates a first control signal. In other cases, the signal generating unit 11 generates a second control signal.

[0061] For example: If the high-voltage plug is effectively inserted into the high-voltage socket and the low-voltage plug is invalidly inserted into the low-voltage socket (e.g., not fully inserted or in poor contact), only the first detection signal HIVL1 is input to the signal generation unit 11, and the signal generation unit 11 generates a second control signal. If the high-voltage plug is invalidly inserted into the high-voltage socket (e.g., not fully inserted or in poor contact), and the low-voltage plug is validly inserted into the low-voltage socket, only the first voltage V1 is input to the signal generation unit 11, and the signal generation unit 11 generates a second control signal. If the high-voltage plug is invalidly inserted into the high-voltage socket and the low-voltage plug is invalidly inserted into the low-voltage socket, neither the first detection signal HIVL1 nor the first voltage V1 can be output, and the signal generation unit 11 generates a second control signal. Only when the high-voltage plug is validly inserted into the high-voltage socket and the low-voltage plug is also validly inserted into the low-voltage socket, the first detection signal HIVL1 and the first voltage V1 are input together to the signal generation unit 11, and the signal generation unit 11 generates a first control signal.

[0062] The first control signal or the second control signal is input to the distribution unit 12. When the first control signal is input to the distribution unit 12, the distribution unit 12 connects the electrical connection between the high-voltage power supply and the high-voltage circuit 100, and the high-voltage power supply outputs the second voltage V2 to the high-voltage circuit 100 to supply power to the high-voltage circuit 100.

[0063] like Figure 1 As shown in FIG, when the first control signal is input to the power distribution unit 12, the power distribution unit 12 establishes an electrical connection between the high-voltage power supply and the regulated power supply. The ACDC power converter converts the high-voltage power supply into AC / DC power, outputting high-voltage DC power. This high-voltage DC power is then output as a second voltage V2 via the power distribution unit 12 to supply power to the regulated power supply.

[0064] When the second control signal is input to the power distribution unit 12 , the power distribution unit 12 disconnects the electrical connection between the high-voltage power supply and the high-voltage circuit 100 , so that the high-voltage circuit 100 is de-energized.

[0065] Therefore, only when the first detection signal HIVL1 and the first voltage V1 are input together does the signal generation unit 11 generate the first control signal, the power distribution unit 12 connects the electrical connection between the high-voltage power supply and the high-voltage circuit 100, and the second voltage V2 supplies power to the high-voltage circuit 100. In all other cases, the signal generation unit 11 generates the second control signal, the power distribution unit 12 disconnects the electrical connection between the high-voltage power supply and the high-voltage circuit 100, and the high-voltage circuit 100 is de-energized.

[0066] In some embodiments, see Figure 3 The signal generating unit 11 includes a first switch unit 111 and a second switch unit 112 , and the first switch unit 111 and the second switch unit 112 are connected in series between the control terminal of the power distribution unit 12 and the power ground GND. Figure 3 In the figure, it is taken as an example that the first switch unit 111 is electrically connected to the power distribution unit 12 and the second switch unit 112 respectively, and the second switch unit 112 is also electrically connected to the power ground GND.

[0067] If the high-voltage plug is effectively inserted into the high-voltage socket, a first detection signal HIVL1 is output to the first switch unit 111 . The first detection signal HIVL1 acts on the first switch unit 111 , so that the first switch unit 111 is in a conducting state.

[0068] If the low-voltage plug is effectively inserted into the low-voltage socket, the first voltage V1 is output to the second switch unit 112 . The first voltage V1 acts on the second switch unit 112 , so that the second switch unit 112 is in a conducting state.

[0069] When the first switch unit 111 and the second switch unit 112 are both in the on state, the control end of the distribution unit 12 is connected to the power ground GND, the control end of the distribution unit 12 receives a low-level first control signal, the distribution unit 12 is in the on state, and the distribution unit 12 connects the electrical connection between the high-voltage power supply and the high-voltage circuit 100.

[0070] The first switch unit 111 or the second switch unit 112 is in the cut-off state, or both the first switch unit 111 and the second switch unit 112 are in the cut-off state, disconnecting the electrical connection between the control end of the distribution unit 12 and the power ground GND. The control end of the distribution unit 12 receives a high-level second control signal, and the distribution unit 12 is in the open circuit state. The distribution unit 12 disconnects the electrical connection between the high-voltage power supply and the high-voltage circuit 100.

[0071] Therefore, only when the high-voltage plug and the low-voltage plug are both effectively plugged in, the first switch unit 111 and the second switch unit 112 can both be in the on state, and then the control end of the distribution unit 12 can receive the first control signal, the distribution unit 12 can be in the on state, and then the distribution unit 12 can connect the connection between the high-voltage power supply and the high-voltage circuit 100, and the high-voltage circuit 100 can be powered on.

[0072] In some embodiments, please refer to Figure 3 The high-voltage interlock control circuit 10 further includes an isolation unit 113, which is electrically connected to the second switch unit 112. If the low-voltage plug is effectively inserted into the low-voltage socket, the isolation unit 113 outputs a first voltage V1. In response to the input of the first voltage V1, the isolation unit 113 outputs a conduction signal to the second switch unit 112, causing the second switch unit 112 to be in a conducting state.

[0073] The second switch unit 112 is electrically connected to the high-voltage circuit 100, and the first voltage V1 is a low-voltage power supply. Therefore, the isolation unit 113 is used to electrically isolate the low-voltage power supply from the second switch unit 112, which can improve safety, reduce the occurrence of electric shock accidents, reduce interference between circuits, and improve system performance and stability.

[0074] See also Figure 4 , Figure 4 : is a circuit structure diagram of a high and low voltage interlocking control circuit provided in an embodiment of the present application, such as Figure 4As shown, the power distribution unit 12 includes a MOS transistor Q1, a first resistor R1, and a second resistor R2. The first resistor R1 is connected in series between the gate of the MOS transistor Q1 and the source of the MOS transistor Q1. The gate of the MOS transistor Q1 is also connected to one end of the second resistor R2. The other end of the second resistor R2 is electrically connected to the first switch unit 111. The MOS transistor Q1 is connected in series to the high-voltage circuit, and the source of the MOS transistor Q1 is used to connect to the high-voltage power supply. The drain of the MOS transistor Q1 is used to output the second voltage V2. Figure 4 In the figure, the source of the MOS transistor Q1 is electrically connected to the ACDC power converter, and the drain of the MOS transistor Q1 is electrically connected to the regulated power supply. In the embodiment of the present application, the MOS transistor Q1 is a PMOS transistor.

[0075] The first switch unit 111 includes a first transistor P1, a third resistor R3, and a fourth resistor R4. One end of the third resistor R3 is used to receive the first detection signal HIVL1, and the other end of the third resistor R3 is connected to the base of the first transistor P1. The emitter of the first transistor P1 is connected to the control terminal of the power distribution unit 12. Specifically, the emitter of the first transistor P1 is electrically connected to the second resistor R2, and the collector of the first transistor P1 is electrically connected to the second switch unit 112. The fourth resistor R4 is connected in series between the emitter and base of the first transistor P1.

[0076] The second switch unit 112 includes a second transistor N2, a fifth resistor R5, and a sixth resistor R6. One end of the fifth resistor R5 is connected to the first voltage V1, the other end of the fifth resistor R5 is connected to the base of the second transistor N2, the emitter of the second transistor N2 is connected to the power ground GND, the collector of the second transistor N2 is electrically connected to the collector of the first transistor P1, and the sixth resistor R6 is connected in series between the emitter and base of the second transistor N2.

[0077] The isolation unit 113 includes a first optoelectronic isolator U1, a seventh resistor R7, and an eighth resistor R8. One end of the seventh resistor R7 is connected to a DC power supply VCC, the other end of the seventh resistor R7 is connected to the collector of the transistor of the first optoelectronic isolator U1, and the emitter of the transistor of the first optoelectronic isolator U1 is electrically connected to the second switch unit 112. Specifically, the emitter of the transistor of the first optoelectronic isolator U1 is connected to the fifth resistor R5. One end of the eighth resistor R8 is used to receive the first voltage V1, the other end of the eighth resistor R8 is connected to the anode of the diode of the first optoelectronic isolator U1, and the cathode of the diode of the first optoelectronic isolator U1 is connected to the signal ground.

[0078] In the embodiment of the present application, the DC power supply VCC is a high-voltage DC power output by an ACDC power converter, and the voltage is +15V. In other embodiments, the DC power supply VCC can also be provided by an independent power supply.

[0079] In the embodiment of the present application, the voltages of the first voltage V1 and the second voltage V2 can be set as needed. In the embodiment of the present application, the voltage of the first voltage V1 is +12V, and the voltage of the second voltage V2 is +15V.

[0080] If the high-voltage plug is effectively inserted into the high-voltage socket, a low-level first detection signal HIVL1 is output to the first transistor P1, turning on the first transistor P1. If the low-voltage plug is effectively inserted into the low-voltage socket, a first voltage V1 is output to the first opto-isolator U1, turning on the diode of the first opto-isolator U1 and, in turn, the transistor of the first opto-isolator U1. The DC power supply VCC acts on the base of the second transistor N2, which receives a high-level turn-on signal, turning on the second transistor N2. The gate of the MOS transistor Q1 is connected to ground. The gate of the MOS transistor Q1 receives a low-level first control signal, pulling the gate potential of the MOS transistor Q1 low and turning on the MOS transistor Q1. MOS transistor Q1 thus completes the electrical connection between the ACDC power converter and the regulated power supply.

[0081] The ACDC power converter converts the high-voltage power supply from AC to DC and outputs high-voltage DC power. The high-voltage DC power is output to the regulated power supply via the drain of the MOS transistor Q1 as a second voltage V2 to supply power to the regulated power supply. Therefore, the DC power supply VCC is at the same voltage as the second voltage V2.

[0082] If the high-voltage plug is not fully inserted into the high-voltage socket, pin 3 of the high-voltage plug will be suspended, the base of the first transistor P1 will be suspended, and the first transistor P1 will be cut off. Regardless of whether the low-voltage plug is properly plugged in, the MOS tube Q1 will be in the cut-off state, and the high-voltage power supply cannot supply power to the regulated power supply.

[0083] If the low-voltage plug is not fully inserted into the low-voltage socket, the first voltage V1 cannot be provided, the first optoelectronic isolator U1 is cut off, and then the second transistor N2 is cut off. Regardless of whether the high-voltage plug is properly plugged in, the MOS tube Q1 is in the cut-off state, and the high-voltage power supply cannot supply power to the regulated power supply.

[0084] Therefore, only when the high-voltage plug is effectively inserted into the high-voltage socket and the low-voltage plug is effectively inserted into the low-voltage socket, can the high-voltage power supply supply power to the regulated power supply, the regulated power supply supply power to the MCU, and the MCU be powered on to work, control the relay circuit to conduct, and then enable the high-voltage power supply to supply power to the compressor drive unit, so that it can work normally.

[0085] Please continue reading Figure 4The low-voltage interlock control circuit 20 includes a second optoelectronic isolator U3, a ninth resistor R9, a tenth resistor R10, and an eleventh resistor R11. One end of the ninth resistor R9 is connected to the second voltage V2, and the other end of the ninth resistor R9 is connected to the anode of the diode of the first optoelectronic isolator U1. The cathode of the diode of the first optoelectronic isolator U1 is connected to the power ground GND. One end of the tenth resistor R10 is connected to the first voltage V1, and the other end of the tenth resistor R10 is connected to the collector of the transistor of the second optoelectronic isolator U3. The emitter of the transistor of the second optoelectronic isolator U3 is electrically connected to one end of the eleventh resistor R11 and the low-voltage circuit, respectively. Specifically, the emitter of the transistor of the second optoelectronic isolator U3 is connected to one end of the eleventh resistor R11 and the DCDC power converter, respectively. The other end of the eleventh resistor R11 is connected to the signal ground SGND.

[0086] If the high-voltage plug is effectively inserted into the high-voltage socket and the low-voltage plug is effectively inserted into the low-voltage socket, the second voltage V2 is input to the anode end of the diode of the second optoelectronic isolator U3, and the first voltage V1 is input to the collector of the transistor of the second optoelectronic isolator U3. The second optoelectronic isolator U3 is turned on, and the emitter of the transistor of the second optoelectronic isolator U3 outputs a first enable signal. The first enable signal is a high-level signal. The first enable signal is output to pin 3 of the DCDC power converter, enabling the DCDC power converter. The DCDC power converter steps down the low-voltage power supply to obtain the power supply voltage of the CAN communication processor. The power supply voltage powers the CAN communication processor, and the CAN communication processor is powered on and begins normal operation. In the embodiment of the present application, the power supply voltage is +5V.

[0087] If the high-voltage plug is not fully inserted into the high-voltage socket, the second voltage V2 cannot be output, the second optoelectronic isolator U3 is in the cut-off state, the emitter of the transistor of the second optoelectronic isolator U3 is pulled low by the signal ground SGND, and the DCDC power converter cannot work normally.

[0088] If the low-voltage plug is not fully inserted into the low-voltage socket, the second voltage V2 cannot be output, the first voltage V1 cannot be output, the second optoelectronic isolator U3 is in the cut-off state, the emitter of the transistor of the second optoelectronic isolator U3 is pulled low by the signal ground SGND, and the DCDC power converter cannot work normally.

[0089] Therefore, only when the high-voltage plug is effectively inserted into the high-voltage socket and the low-voltage plug is effectively inserted into the low-voltage socket, the second optoelectronic isolator U3 can be turned on and the DCDC power converter can be enabled. The DCDC power converter will step down the low-voltage power supply to obtain a step-down power supply. The step-down power supply powers the CAN communication processor, and the CAN communication processor is powered on and starts to work normally.

[0090] To sum up, only when the high-voltage plug is effectively inserted into the high-voltage socket and the low-voltage plug is effectively inserted into the low-voltage socket, can the high-voltage interlock control circuit receive the common input of the first detection signal and the first power supply, and then the high-voltage circuit can be energized, and the low-voltage interlock control circuit can receive the common input of the second power supply and the first power supply, and then the low-voltage circuit can be energized. Only when the high-voltage circuit and the low-voltage circuit are energized together can the high-voltage load be driven to work, ensuring that the high-voltage load works when the high-voltage plug and the low-voltage plug are both effectively plugged in, avoiding safety problems caused by loose plugging of the high-voltage plug or the low-voltage plug, and improving the safety of the electric vehicle. At the same time, the high-low voltage interlock circuit is a hardware circuit with a fast response speed, further improving the safety of the electric vehicle.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Based on the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present application as described above. For the sake of simplicity, they are not provided in detail. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A high and low voltage interlocking control circuit, characterized in that: Applied to an electric vehicle, the electric vehicle includes a high-voltage plug, a high-voltage circuit, a low-voltage plug, and a low-voltage circuit, wherein the high-voltage circuit is electrically connected to the high-voltage plug and the high-voltage load, respectively, and the high-voltage circuit is also communicatively connected to the low-voltage circuit. If the high-voltage plug is effectively inserted into the high-voltage socket, the high-voltage plug is used to connect the electrical connection between the high-voltage power supply and the high-voltage circuit and output a first detection signal. The low-voltage plug is electrically connected to the low-voltage circuit. If the low-voltage plug is effectively inserted into the low-voltage socket, the low-voltage plug is used to connect the electrical connection between the low-voltage power supply and the low-voltage circuit and output a first voltage. The high and low voltage interlocking control circuit includes: a high voltage interlocking control circuit and a low voltage interlocking control circuit; The high-voltage interlock control circuit is electrically connected to the high-voltage circuit, and the low-voltage interlock control circuit is electrically connected to the low-voltage circuit. The high-voltage interlock control circuit is used to respond to the common input of the first detection signal and the first voltage, and is in a path state, so that the high-voltage power supply outputs a second voltage to the high-voltage circuit, and the high-voltage circuit is in a power-on state, and the low-voltage interlock control circuit is used to respond to the common input of the second voltage and the first voltage, and is in a path state and outputs a first enable signal, so that the low-voltage power supply supplies power to the low-voltage circuit, and the low-voltage circuit is in a power-on state, and then the low-voltage circuit transmits a control instruction to the high-voltage circuit, and the high-voltage circuit responds to the input of the control instruction to drive the high-voltage load to work.

2. The high and low voltage interlocking control circuit according to claim 1, characterized in that: The high-voltage interlock control circuit includes a signal generating unit and a power distribution unit, wherein the signal generating unit is electrically connected to the power distribution unit, and the power distribution unit is electrically connected to the high-voltage circuit; The signal generating unit is configured to generate a first control signal in response to a common input of the first detection signal and the first voltage; The power distribution unit is configured to respond to input of the first control signal and be in a conduction state, so that the high-voltage power supply outputs the second voltage to the high-voltage circuit.

3. The high and low voltage interlocking control circuit according to claim 2, characterized in that: The signal generating unit includes a first switch unit and a second switch unit, wherein the first switch unit and the second switch unit are connected in series between the control terminal of the power distribution unit and the power ground; The first switch unit is configured to be in a conducting state in response to input of the first detection signal; The second switch unit is configured to be in an on state in response to input of the first voltage; When the first switch unit and the second switch unit are both in the on state, the control end of the power distribution unit receives the first control signal.

4. The high and low voltage interlocking control circuit according to claim 3, characterized in that: The signal generating unit further includes an isolation unit; The isolation unit is electrically connected to the second switch unit, and the isolation unit is configured to output a conduction signal to the second switch unit in response to input of the first voltage.

5. The high and low voltage interlocking control circuit according to claim 3, characterized in that: The power distribution unit includes a MOS tube, a first resistor and a second resistor; The first resistor is connected in series between the gate of the MOS transistor and the source of the MOS transistor. The gate of the MOS transistor is also connected to one end of the second resistor. The other end of the second resistor is electrically connected to the first switch unit. The MOS transistor is connected in series to the high-voltage circuit, and the source of the MOS transistor is used to access a high-voltage power supply. The drain of the MOS transistor is used to output the second voltage.

6. The high and low voltage interlocking control circuit according to claim 3, characterized in that: The first switch unit includes a first transistor, a third resistor and a fourth resistor; One end of the third resistor is used to access the first detection signal, the other end of the third resistor is connected to the base of the first transistor, the emitter of the first transistor is connected to the control end of the distribution unit, the collector of the first transistor is electrically connected to the second switching unit, and the fourth resistor is connected in series between the emitter and base of the first transistor.

7. The high and low voltage interlocking control circuit according to claim 6, characterized in that: The second switch unit includes a second transistor, a fifth resistor and a sixth resistor; One end of the fifth resistor is used to connect to the first voltage, the other end of the fifth resistor is connected to the base of the second transistor, the emitter of the second transistor is connected to the power ground, the collector of the second transistor is electrically connected to the collector of the first transistor, and the sixth resistor is connected in series between the emitter and the base of the second transistor.

8. The high and low voltage interlocking control circuit according to claim 4, characterized in that: The isolation unit includes a first photoelectric isolator, a seventh resistor and an eighth resistor; One end of the seventh resistor is connected to a DC power supply, the other end of the seventh resistor is connected to the collector of the transistor of the first photoelectric isolator, the emitter of the transistor of the first photoelectric isolator is electrically connected to the second switch unit, one end of the eighth resistor is used to access the first voltage, the other end of the eighth resistor is connected to the anode of the diode of the first photoelectric isolator, and the cathode of the diode of the first photoelectric isolator is connected to the signal ground.

9. The high and low voltage interlocking control circuit according to any one of claims 1 to 8, characterized in that: The low voltage interlock control circuit includes a second photoelectric isolator, a ninth resistor, a tenth resistor and an eleventh resistor; One end of the ninth resistor is used to access the second voltage, the other end of the ninth resistor is connected to the anode of the diode of the first photoelectric isolator, and the cathode of the diode of the first photoelectric isolator is connected to the power ground. One end of the tenth resistor is used to access the first voltage, the other end of the tenth resistor is connected to the collector of the transistor of the second photoelectric isolator, and the emitter of the transistor of the second photoelectric isolator is electrically connected to one end of the eleventh resistor and the low-voltage circuit respectively, and the other end of the eleventh resistor is connected to the signal ground.

10. An electric vehicle, characterized in that: comprising a high-voltage plug, a low-voltage plug, a high-voltage circuit, a low-voltage circuit, and a high-low voltage interlock control circuit according to any one of claims 1 to 9, wherein the high-voltage circuit is electrically connected to the high-voltage plug and the high-voltage load, respectively, and the high-voltage circuit is also communicatively connected to the low-voltage circuit; if the high-voltage plug is effectively inserted into the high-voltage socket, the high-voltage plug is used to connect the electrical connection between the high-voltage power supply and the high-voltage circuit and output the first detection signal; the low-voltage plug is electrically connected to the low-voltage circuit; if the low-voltage plug is effectively inserted into the low-voltage socket, the low-voltage plug is used to connect the electrical connection between the low-voltage power supply and the low-voltage circuit and output the first voltage; The high-low voltage interlock control circuit is used to control the high-voltage circuit and the low-voltage circuit to be in an energized state when the high-voltage plug is effectively inserted into the high-voltage socket and the low-voltage plug is effectively inserted into the low-voltage socket, so that the low-voltage circuit sends a control instruction to the high-voltage circuit, and then the high-voltage circuit responds to the input of the control instruction to drive the high-voltage load to work.

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