Power domain controller and vehicle

Abstract

The invention provides a power domain controller and a vehicle, and relates to the technical field of vehicles. The power domain controller comprises a hardware active short-circuit protection loop, a bus voltage overvoltage detection loop and a three-phase current overcurrent detection loop, the bus voltage overvoltage detection loop and the three-phase current overcurrent detection loop are connected with the hardware active short-circuit protection loop, the bus voltage overvoltage detection loop is used for detecting whether bus voltage in a motor driving system is larger than a hardware overvoltage protection threshold value or not, and the three-phase current overcurrent detection loop is connected with the hardware active short-circuit protection loop. When it is detected that the bus voltage is larger than a hardware overvoltage protection threshold value, a hardware active short circuit protection loop is triggered to control active short circuit of an IGBT in the motor driving system; the three-phase current overcurrent detection loop is used for detecting whether the three-phase current in the motor driving system is greater than a hardware overcurrent protection current threshold value or not, and triggering the hardware active short circuit protection loop to control the IGBT active short circuit in the motor driving system when detecting that the three-phase current is greater than the hardware overcurrent protection current threshold value. And the reliability and the safety of the power domain controller are improved.

Description

Technical Field

[0001] This application relates to the technical field of vehicles, and particularly to a power domain controller and a vehicle. Background Art

[0002] The intelligent manufacturing of automobiles has become an inevitable trend in the future development of the automotive industry. As the functions of automobiles become more and more, the types and numbers of domain controllers become numerous, resulting in a sharp increase in the number of Electronic Control Units (ECUs). Currently, to meet the needs of ECUs with a sharp increase in data, multiple ECUs with similar and separated functions are integrated into a processor hardware platform with stronger performance than ECUs to form automotive domain controllers (Domain Control Unit, abbreviated as DCU), such as power domain controllers, body domain controllers, and infotainment domain controllers, etc. Among them, the power domain controller is used to manage and control the power system of the vehicle, and its safety plays a crucial role in the stable operation and safe driving of the vehicle.

[0003] In related technologies, the power domain controller includes a Microcontroller Unit (abbreviated as MCU) and a motor drive system. Among them, the MCU receives the bus voltage detected by the bus voltage detection circuit in the motor drive system and the three-phase current detected by the three-phase current detection circuit in the motor drive system, and when it is determined that the bus voltage is greater than a preset voltage threshold or the three-phase current is greater than a preset current threshold, the control software strategy is triggered, that is, the upper bridge arm of the Insulated Gate Bipolar Transistor (abbreviated as IGBT) in the motor drive system is turned off, and the lower bridge arm is turned on to achieve the active short circuit of the ICBT to prevent uncontrollable rectification in the motor drive system.

[0004] However, the inventor's research found that if the power domain controller uses the above method to prevent uncontrollable rectification in the motor drive system, there are problems with poor reliability in some scenarios. Summary of the Invention

[0005] This application provides a power domain controller and a vehicle to improve the problem of poor reliability in some scenarios when the power domain controller uses the above software strategy method to prevent uncontrollable rectification in the motor drive system.

[0006] In a first aspect, this application provides a power domain controller, including: a hardware active short circuit protection circuit, a bus voltage overvoltage detection circuit connected to the hardware active short circuit protection circuit, and a three-phase current overcurrent detection circuit;

[0007] Among them, the bus voltage overvoltage detection circuit is used to detect whether the bus voltage in the motor drive system is greater than the hardware overvoltage protection threshold, and when it detects that the bus voltage is greater than the hardware overvoltage protection threshold, it triggers the hardware active short-circuit protection circuit to control the IGBT in the motor drive system to be actively short-circuited; the three-phase current overcurrent detection circuit is used to detect whether the three-phase current in the motor drive system is greater than the hardware overcurrent protection current threshold, and when it detects that the three-phase current is greater than the hardware overcurrent protection current threshold, it triggers the hardware active short-circuit protection circuit to control the IGBT in the motor drive system to be actively short-circuited.

[0008] In a possible implementation, the bus voltage overvoltage detection circuit includes: a first comparator, the positive input terminal of the first comparator is used to input the hardware overvoltage protection threshold, the negative input terminal of the first comparator is connected to the output terminal of the bus voltage detection circuit, and the output terminal of the first comparator is connected to the input terminal of the hardware active short-circuit protection circuit; the first comparator is used to output a first level when the bus voltage is greater than or equal to the hardware overvoltage protection threshold, and output a second level when the bus voltage is less than the hardware overvoltage protection threshold.

[0009] In a possible implementation, the three-phase current overcurrent detection circuit includes: a second comparator, the positive input terminal of the second comparator is used to input the hardware overcurrent protection threshold, the negative input terminal of the second comparator is connected to the output terminal of the three-phase current detection circuit, and the output terminal of the second comparator is connected to the input terminal of the hardware active short-circuit protection circuit; the second comparator is used to output a first level when the three-phase current is greater than or equal to the hardware overcurrent protection threshold, and output a second level when the three-phase current is less than the hardware overcurrent protection threshold.

[0010] In a possible implementation, the hardware active short-circuit protection circuit includes: a buffer, the first input terminal of the buffer is connected to the output terminal of the bus voltage overvoltage detection circuit, and the second input terminal of the buffer is connected to the output terminal of the three-phase current overcurrent detection circuit; the buffer is used to control the IGBT in the motor drive system to be actively short-circuited when receiving the first level.

[0011] In a possible implementation, the power domain controller further includes: a watchdog signal hardware detection circuit, the input terminal of the watchdog signal hardware detection circuit is used to input the watchdog signal, the output terminal of the watchdog signal hardware detection circuit is connected to the input terminal of the hardware active short-circuit protection circuit, and the watchdog signal hardware detection circuit is used to detect whether the watchdog signal is normal, and when it detects that the watchdog signal is abnormal, it triggers the hardware active short-circuit protection circuit.

[0012] In a possible implementation, the power domain controller further includes: an anti-reverse connection circuit provided between the power supply and the power input terminal of the power domain controller, and the anti-reverse connection circuit is used to cut off the power supply circuit when it detects that the power supply is reversely connected.

[0013] In a possible implementation, the reverse connection prevention circuit includes an NMOS transistor, a PMOS transistor, an NMOS transistor driving circuit, and a PMOS transistor driving circuit; the input terminal of the NMOS transistor driving circuit and the source electrode of the NMOS transistor are both connected to the positive power supply terminal, the first output terminal of the NMOS transistor driving circuit is connected to the gate electrode of the NMOS transistor, and the second output terminal of the NMOS transistor driving circuit is connected to the negative power supply terminal; the input terminal of the PMOS transistor driving circuit and the source electrode of the PMOS transistor are both grounded, the first output terminal of the PMOS transistor driving circuit is connected to the gate electrode of the PMOS transistor, the second output terminal of the PMOS transistor driving circuit is connected to the drain electrode of the NMOS transistor, and the drain electrode of the PMOS transistor is connected to the negative power supply terminal.

[0014] In a possible implementation, the NMOS transistor driving circuit includes a first resistor, a second resistor, a first transient suppression diode, and a capacitor, where: the first end of the first resistor, the positive terminal of the first transient suppression diode, and the first end of the capacitor are connected to form the input terminal of the NMOS transistor driving circuit; the second end of the first resistor, the negative terminal of the first transient suppression diode, the second end of the capacitor, and the first end of the second resistor are connected to form the first output terminal of the NMOS transistor driving circuit; the second end of the second resistor is the second output terminal of the NMOS transistor driving circuit.

[0015] In a possible implementation, the PMOS transistor driving circuit includes a third resistor, a fourth resistor, and a second transient suppression diode, where: the first end of the third resistor and the negative terminal of the second transient suppression diode are connected to form the input terminal of the PMOS transistor driving circuit; the second end of the third resistor, the positive terminal of the second transient suppression diode, and the first end of the fourth resistor are connected to form the first output terminal of the PMOS transistor driving circuit; the second end of the fourth resistor is the second output terminal of the PMOS transistor driving circuit.

[0016] In a possible implementation, the reverse connection prevention circuit includes a diode, the positive terminal of the diode is connected to the positive power supply terminal, and the negative terminal of the diode is connected to the negative power supply terminal.

[0017] In a possible implementation, the power domain controller further includes: an MCU, configured to detect the bus voltage and three-phase current in the motor drive system in real time, and when it is detected that the bus voltage is greater than the software overvoltage protection threshold or the three-phase current is greater than the software overcurrent protection threshold, control the software strategy to trigger, and the software strategy is used to control the IGBT to actively short-circuit, the software overvoltage protection threshold is less than the hardware overvoltage protection threshold, and the software overcurrent protection threshold is less than the hardware overcurrent protection threshold.

[0018] In a second aspect, the present application provides a vehicle, including a vehicle body and the power domain controller provided in the first aspect as described above.

[0019] The power domain controller and vehicle provided by this application. The power domain controller includes a hardware active short - circuit protection circuit, a bus voltage over - voltage detection circuit connected to the hardware active short - circuit protection circuit, and a three - phase current over - current detection circuit. Among them, the bus voltage over - voltage detection circuit is used to detect whether the bus voltage in the motor drive system is greater than the hardware over - voltage protection threshold, and when it detects that the bus voltage is greater than the hardware over - voltage protection threshold, it triggers the hardware active short - circuit protection circuit to control the IGBT in the motor drive system to be actively short - circuited; the three - phase current over - current detection circuit is used to detect whether the three - phase current in the motor drive system is greater than the hardware over - current protection current threshold, and when it detects that the three - phase current is greater than the hardware over - current protection current threshold, it triggers the hardware active short - circuit protection circuit to control the IGBT in the motor drive system to be actively short - circuited. In this application, by setting a hardware active short - circuit protection circuit, a bus voltage over - voltage detection circuit connected to the hardware active short - circuit protection circuit, and a three - phase current over - current detection circuit in the power domain controller, and directly triggering the hardware active short - circuit protection circuit to control the IGBT to be actively short - circuited when the bus voltage over - voltage detection circuit detects over - voltage or the three - phase current over - current detection circuit detects over - current, it realizes fast control of the hardware active short - circuit within a short response time, improving the reliability and safety of the power domain controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings herein are incorporated into the specification and form a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0021] Figure 1 Structural schematic of the power domain controller provided by an embodiment of this application Figure 1 ;

[0022] Figure 2 Structural schematic of the power domain controller system provided by an embodiment of this application Figure 2 ;

[0023] Figure 3 Structural schematic diagram of the reverse - connection prevention circuit provided by an embodiment of this application;

[0024] Figure 4 Structural schematic diagram of the power supply circuit of the power domain controller provided by an embodiment of this application.

[0025] Through the above - mentioned drawings, clear embodiments of this application have been shown, and there will be more detailed descriptions hereinafter. These drawings and written descriptions are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Exemplary embodiments will be described in detail herein, and examples thereof are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0027] In the related art, the MCU receives the bus voltage detected by the bus voltage detection circuit in the motor drive system and the three-phase current detected by the three-phase current detection circuit in the motor drive system, and when it is determined that the bus voltage is greater than a preset voltage threshold or the three-phase current is greater than a preset current threshold, the control software strategy is triggered. However, in this method, during the process of triggering the MCU control software strategy, the signal interaction is at the millisecond level, resulting in problems such as slow communication rate and long response time. As a result, when the power domain controller uses this method to prevent uncontrollable rectification in the motor drive system, there are problems of poor reliability and low safety in some scenarios.

[0028] Based on the problems existing in the related art, in the embodiments of the present application, a hardware active short-circuit protection circuit, a bus voltage overvoltage detection circuit connected to the hardware active short-circuit protection circuit, and a three-phase current overcurrent detection circuit are provided in the power domain controller. When the bus voltage overvoltage detection circuit detects overvoltage or the three-phase current overcurrent detection circuit detects overcurrent, the hardware active short-circuit protection circuit is directly triggered to control the IGBT to actively short-circuit, so as to quickly control the hardware active short-circuit within a short response time, improving the reliability and safety of the power domain controller.

[0029] The power domain controller provided by the embodiments of the present application will be described in detail below with reference to specific embodiments.

[0030] Figure 1 Schematic structure of the power domain controller provided by the embodiments of the present application Figure 1 As Figure 1 shown, the power domain controller includes a hardware active short-circuit protection circuit, a bus voltage overvoltage detection circuit connected to the hardware active short-circuit protection circuit, and a three-phase current overcurrent detection circuit;

[0031] Among them, the bus voltage overvoltage detection circuit is used to detect whether the bus voltage in the motor drive system is greater than the hardware overvoltage protection threshold, and when it detects that the bus voltage is greater than the hardware overvoltage protection threshold, it triggers the hardware active short - circuit protection circuit to control the IGBT in the motor drive system to perform active short - circuit; the three - phase current over - current detection circuit is used to detect whether the three - phase current in the motor drive system is greater than the hardware over - current protection current threshold, and when it detects that the three - phase current is greater than the hardware over - current protection current threshold, it triggers the hardware active short - circuit protection circuit to control the IGBT in the motor drive system to perform active short - circuit.

[0032] Exemplarily, the hardware active short - circuit protection circuit can be represented as the hardware active short - circuit (Active ShortCircuit, abbreviated as ASC) circuit.

[0033] It can be understood that the power domain control system provided in the embodiments of this application includes a motor drive system, and the motor drive system includes a bus voltage detection circuit, a three - phase current detection circuit, IGBT, etc.

[0034] Exemplarily, the bus voltage in the motor drive system is the real - time bus voltage detected by the bus voltage detection circuit; the three - phase current in the motor drive system is the real - time three - phase current detected by the three - phase current detection circuit.

[0035] Exemplarily, the hardware overvoltage protection threshold can be 530V, and the hardware over - current protection threshold can be 520A. This application does not limit the magnitudes of the hardware overvoltage protection threshold and the hardware over - current protection threshold, and they can be determined specifically according to actual application requirements.

[0036] Exemplarily, controlling the IGBT in the motor drive system to perform active short - circuit can be to control the upper bridge arm of the IGBT to turn off and the lower bridge arm to turn on, so as to prevent uncontrollable rectification in the motor drive system, and thus effectively reduce the damage to devices such as the support capacitor and the power battery caused by uncontrollable rectification.

[0037] The power domain controller provided by the embodiment of the present application includes a hardware active short - circuit protection loop, a bus voltage over - voltage detection loop connected to the hardware active short - circuit protection loop, and a three - phase current over - current detection loop. Among them, the bus voltage over - voltage detection loop is used to detect whether the bus voltage in the motor drive system is greater than the hardware over - voltage protection threshold, and when it detects that the bus voltage is greater than the hardware over - voltage protection threshold, it triggers the hardware active short - circuit protection loop to control the IGBT in the motor drive system to perform an active short - circuit; the three - phase current over - current detection loop is used to detect whether the three - phase current in the motor drive system is greater than the hardware over - current protection current threshold, and when it detects that the three - phase current is greater than the hardware over - current protection current threshold, it triggers the hardware active short - circuit protection loop to control the IGBT in the motor drive system to perform an active short - circuit. By setting a hardware active short - circuit protection loop, a bus voltage over - voltage detection loop connected to the hardware active short - circuit protection loop, and a three - phase current over - current detection loop in the power domain controller, and directly triggering the hardware active short - circuit protection loop to control the IGBT to perform an active short - circuit when the bus voltage over - voltage detection loop detects over - voltage or the three - phase current over - current detection loop detects over - current, the present application embodiment realizes quickly controlling the hardware active short - circuit within a short response time, improving the reliability and safety of the power domain controller.

[0038] Optionally, the bus voltage over - voltage detection loop includes: a first comparator, the positive input terminal of the first comparator is used to input the hardware over - voltage protection threshold, the negative input terminal of the first comparator is connected to the output terminal of the bus voltage detection loop, and the output terminal of the first comparator is connected to the input terminal of the hardware active short - circuit protection loop; the first comparator is used to output a first level when the bus voltage is greater than or equal to the hardware over - voltage protection threshold, and output a second level when the bus voltage is less than the hardware over - voltage protection threshold.

[0039] Exemplarily, the first level can be a low level (logic 0), and the second level can be a high level (logic 1).

[0040] Exemplarily, when the bus voltage is greater than or equal to the hardware over - voltage protection threshold, it indicates that hardware over - voltage occurs, and a low level is output.

[0041] Exemplarily, when the three - phase current is greater than or equal to the hardware over - current protection threshold, it indicates that hardware over - current occurs, and a low level is output.

[0042] Optionally, the three - phase current over - current detection loop includes: a second comparator, the positive input terminal of the second comparator is used to input the hardware over - current protection threshold, the negative input terminal of the second comparator is connected to the output terminal of the three - phase current detection loop, and the output terminal of the second comparator is connected to the input terminal of the hardware active short - circuit protection loop; the second comparator is used to output a first level when the three - phase current is greater than or equal to the hardware over - current protection threshold, and output a second level when the three - phase current is less than the hardware over - current protection threshold.

[0043] The first level and the second level are similar to the above, and will not be elaborated here.

[0044] Optionally, the hardware active short-circuit protection circuit includes: a buffer, the first input end of the buffer is connected to the output end of the bus voltage overvoltage detection circuit, and the second input end of the buffer is connected to the output end of the three-phase current overcurrent detection circuit; the buffer is used for controlling the IGBT in the motor drive system to be actively short-circuited when receiving the first level.

[0045] Exemplarily, the buffer can be a multi-input buffer (Multi-Input Buffer) or a multiplexer buffer (Multiplexer Buffer).

[0046] It can be understood that when the buffer receives the first level, it means that there is a hardware overvoltage and / or hardware overcurrent fault, that is, the buffer controls the IGBT in the motor drive system to be actively short-circuited to prevent uncontrollable rectification in the motor drive system.

[0047] Optionally, the power domain controller provided by the embodiment of the present application may further include a watchdog signal hardware detection circuit. The input end of the watchdog signal hardware detection circuit is used to input a watchdog signal, and the output end of the watchdog signal hardware detection circuit is connected to the input end of the hardware active short-circuit protection circuit. The watchdog signal hardware detection circuit is used to detect whether the watchdog signal is normal, and trigger the hardware active short-circuit protection circuit when detecting that the watchdog signal is abnormal.

[0048] Exemplarily, the watchdog signal can be a reset signal periodically sent to the watchdog timer integrated in the MCU through hardware or software.

[0049] In a possible implementation manner, the third input end of the buffer is connected to the output end of the watchdog signal hardware detection circuit, and controls the IGBT in the motor drive system to be actively short-circuited when detecting that the watchdog signal is abnormal, so as to prevent uncontrollable rectification in the motor drive system.

[0050] Exemplarily, the connection manner between the third input end of the buffer and the output end of the watchdog signal hardware detection circuit can be through a pin connection.

[0051] Compared with the related art, when a MCU stuck fault occurs, the IGBT is actively short-circuited by adopting a software strategy. The power domain controller provided by the embodiment of the present application sets a watchdog signal hardware detection circuit in the power domain controller, and directly triggers the hardware active short-circuit protection circuit to control the IGBT to be actively short-circuited when detecting faults such as MCU stuck, reducing the response time of controlling the IGBT to be actively short-circuited, and thus improving the reliability of the power domain controller.

[0052] Figure 2 Structural schematic of the power domain controller system provided by the embodiment of the present application Figure 2 . As Figure 2 shown, the power domain controller provided by the embodiment of the present application includes a hardware active short-circuit protection circuit, a bus voltage overvoltage detection circuit, a three-phase current overcurrent detection circuit, and a watchdog signal hardware detection circuit connected to the hardware active short-circuit protection circuit. Among them, the hardware active short-circuit protection circuit includes a buffer, the bus voltage overvoltage detection circuit includes a first comparator, and the three-phase current overcurrent detection circuit includes a second comparator.

[0053] In some embodiments, the positive input terminal of the first comparator is used to input the hardware overvoltage protection threshold, the negative input terminal of the first comparator is connected to the output terminal of the bus voltage detection circuit, and the output terminal of the first comparator is connected to the first input terminal of the buffer; the positive input terminal of the second comparator is used to input the hardware overcurrent protection threshold, the negative input terminal of the second comparator is connected to the output terminal of the three-phase current detection circuit, and the output terminal of the second comparator is connected to the second input terminal of the buffer; the input terminal of the watchdog signal hardware detection circuit is used to input the watchdog signal, and the output terminal of the watchdog signal hardware detection circuit is connected to the third input terminal of the buffer.

[0054] Among them, the specific implementation method of triggering the hardware active short-circuit protection circuit to control the IGBT active short circuit is similar to the above, and will not be elaborated here.

[0055] In view of the problem that circuit devices are damaged when the power supply for the power domain controller is reversely connected in the related art, optionally, the power domain controller provided by the embodiment of the present application further includes an anti-reverse connection circuit arranged between the power supply and the power input terminal of the power domain controller, and the anti-reverse connection circuit is used to cut off the power supply circuit when detecting a reverse power connection.

[0056] The following will Figure 3 describe the anti-reverse connection circuit provided by the embodiment of the present application in detail.

[0057] Figure 3 Structural schematic of the anti-reverse connection circuit provided by the embodiment of the present application. As Figure 3 shown, the anti-reverse connection circuit includes an NMOS transistor 33, a PMOS transistor 34, an NMOS transistor drive circuit 31, and a PMOS transistor drive circuit 32.

[0058] Among them, the input end of the NMOS transistor driving circuit and the source electrode of the NMOS transistor are both connected to the positive power supply terminal. The first output end of the NMOS transistor driving circuit is connected to the gate of the NMOS transistor, and the second output end of the NMOS transistor driving circuit is connected to the negative power supply terminal. The input end of the PMOS transistor driving circuit and the source electrode of the PMOS transistor are both grounded (DGND). The first output end of the PMOS transistor driving circuit is connected to the gate of the PMOS transistor, and the second output end of the PMOS transistor driving circuit is connected to the drain of the NMOS transistor. The drain of the PMOS transistor is connected to the negative power supply terminal.

[0059] Exemplarily, the positive power supply terminal can be represented as KL30, and the negative power supply terminal can be represented as KL31.

[0060] Such as Figure 3 As shown, optionally, the NMOS transistor driving circuit includes a first resistor 310, a second resistor 311, a first transient suppression diode 312, and a capacitor 313, where: the first end of the first resistor 310, the positive electrode end of the first transient suppression diode 312, and the first end of the capacitor 313 are connected to form the input end of the NMOS transistor driving circuit; the second end of the first resistor 310, the negative electrode end of the first transient suppression diode 312, the second end of the capacitor 313, and the first end of the second resistor 311 are connected to form the first output end of the NMOS transistor driving circuit; the second end of the second resistor 311 is the second output end of the NMOS transistor driving circuit.

[0061] Exemplarily, the voltage input at the positive power supply terminal can be 12V.

[0062] Exemplarily, the first resistor and the second resistor can be resistors with the same resistance value.

[0063] Such as Figure 3 As shown, it can be understood that the voltage at the source electrode of the NMOS transistor is the same as the voltage at the input end of the NMOS transistor driving circuit, and the voltage at the gate of the NMOS transistor is the same as the voltage at the first output end of the NMOS transistor driving circuit.

[0064] Such as Figure 3 As shown, optionally, the PMOS transistor driving circuit includes a third resistor 320, a fourth resistor 321, and a second transient suppression diode 323, where: the first end of the third resistor 320 and the negative electrode end of the second transient suppression diode are connected to form the input end of the PMOS transistor driving circuit; the second end of the third resistor 320, the positive electrode end of the second transient suppression diode, and the first end of the fourth resistor 321 are connected to form the first output end of the PMOS transistor driving circuit; the second end of the fourth resistor 321 is the second output end of the PMOS transistor driving circuit.

[0065] Exemplarily, the third resistor and the fourth resistor can be resistors with the same resistance value.

[0066] As Figure 3 shown, it can be understood that the voltage of the source of the PMOS transistor is the same as the voltage of the input terminal of the PMOS transistor driving circuit, and the voltage of the gate of the PMOS transistor is the same as the voltage of the first output terminal of the PMOS transistor driving circuit.

[0067] Optionally, the reverse connection prevention circuit includes a diode. The positive terminal of the diode is connected to the positive power supply terminal, and the negative terminal of the diode is connected to the negative power supply terminal. Through the forward conduction property of the diode, when the positive and negative terminals of the power supply are reversely connected, the power supply loop can be passively cut off through the diode to protect the circuit components from damage.

[0068] It should be noted that in the power domain controller provided in the embodiment of the present application, the reverse connection prevention circuit can be a part of the power supply circuit of the power domain controller. Optionally, the power supply circuit may further include a capacitor, a bidirectional transient voltage suppression diode (Transient Voltage Suppression Diode, abbreviated as TVS), and a common mode inductor. Among them, the capacitor is used for electrostatic protection and high-frequency filtering; the bidirectional TVS is used for clamping positive and negative pulses; the common mode inductor is used for suppressing common mode interference in circuit noise.

[0069] Optionally, the power supply circuit may further include a backup power supply circuit, which is used to convert high-voltage power supply into low-voltage power supply when the low-voltage power supply is interrupted or under-voltage, so as to ensure the normal operation of the controller.

[0070] Next, in combination with Figure 4 a detailed description will be given of the power supply circuit of the power domain controller provided in the embodiment of the present application.

[0071] Figure 4 is a schematic structural diagram of the power supply circuit of the power domain controller provided in the embodiment of the present application. As Figure 4 shown, the power supply circuit includes a positive power supply terminal KL30, a negative power supply terminal KL31, a bidirectional transient voltage suppression diode D203, a common mode inductor L201 and a common mode inductor L202, a power supply terminal LVBAT0, a power supply terminal LVBAT1, and a power supply terminal LVBAT3, a front-end electrostatic protection capacitor C227 and a front-end electrostatic protection capacitor C217, a diode D201, an NMOS transistor driving circuit 41, a PMOS transistor driving circuit 42, an NMOS transistor 43, a PMOS transistor driving circuit 44, a backup power supply circuit KL30 Backup, and a ground terminal DGND.

[0072] Among them, the common mode inductor L201 is used for suppressing common mode interference in the noise of the loop where the common mode inductor L201 is located, and the common mode inductor L202 is used for suppressing common mode interference in the noise of the loop where the common mode inductor L202 is located;

[0073] The front-end electrostatic protection capacitors C227 and C217 are used for electrostatic protection and high-frequency filtering;

[0074] The bidirectional transient voltage suppression diode D203 is used for clamping positive and negative pulses;

[0075] The specific implementation manners of the NMOS transistor drive circuit 41 and the PMOS transistor drive circuit 42 are similar to the above, and will not be elaborated here;

[0076] The backup power supply circuit KL30 Backup is used to convert the high-voltage power supply into low voltage when the low-voltage power supply is interrupted or under-voltage, so as to ensure the normal operation of the controller.

[0077] It can be understood that in the power supply circuit of the power domain controller provided by the embodiment of the present application, on the one hand, through anti-reverse connection devices such as NMOS transistors and PMOS transistors, the corresponding power supply circuit is actively cut off when the power supply is reversely connected, and the corresponding power supply circuit is passively cut off when the power supply is reversely connected through diodes, providing double protection and improving the reliability of the circuit; on the other hand, through the backup power supply circuit, when the low-voltage power supply is interrupted or under-voltage, the high-voltage power supply is converted into low voltage to ensure the normal operation of the controller.

[0078] Optionally, the power domain controller provided by the embodiment of the present application further includes: an MCU, which is used to detect the bus voltage and three-phase current in the motor drive system in real time, and when it detects that the bus voltage is greater than the software over-voltage protection threshold or the three-phase current is greater than the software over-current protection threshold, control the software strategy to trigger. This software strategy is used to control the IGBT to actively short-circuit. The software over-voltage protection threshold is less than the hardware over-voltage protection threshold, and the software over-current protection threshold is less than the hardware over-current protection threshold.

[0079] Exemplarily, the software over-voltage protection threshold can be 490V, and the software over-current protection threshold can be 500A. It should be noted that the embodiment of the present application does not limit the magnitudes of the software over-voltage protection threshold and the software over-current protection threshold. It is only required that the software over-voltage protection threshold is less than the hardware over-voltage protection threshold and the software over-current protection threshold is less than the hardware over-current protection threshold. The specific magnitudes can be determined according to actual application requirements.

[0080] Compared with the related art, in which the MCU controls the software strategy to achieve the active short-circuit of the IGBT in the motor drive system, in the power domain controller provided by the embodiment of the present application, by combining the software strategy and the hardware active short-circuit protection circuit, when faults such as hardware over-voltage, hardware over-current, and MCU stuck occur in the power domain controller, by triggering the software strategy and / or the hardware active short-circuit protection circuit, the active short-circuit of the IGBT is controlled in time, thereby effectively preventing uncontrollable rectification in the motor drive system and improving the reliability of the power domain controller.

[0081] In summary, the control method of the power domain controller provided by the embodiments of the present application will be described in detail below in combination with specific embodiments.

[0082] In a possible implementation manner, the specific implementation manner of the control method of the power domain controller provided by the embodiments of the present application can be: the MCU in the power domain controller detects the bus voltage and three-phase current in the motor drive system in real time, and when it detects that the bus voltage is greater than the software overvoltage protection threshold or the three-phase current is greater than the software overcurrent protection threshold, it controls the software strategy to trigger, so as to control the IGBT in the motor drive system to actively short-circuit through the software strategy; in response to the software strategy failing to trigger or the software strategy not responding in time, the bus voltage overvoltage detection circuit in the power domain controller detects whether the bus voltage in the motor drive system is greater than the hardware overvoltage protection threshold, and when it detects that the bus voltage is greater than the hardware overvoltage protection threshold, it triggers the hardware active short-circuit protection circuit to control the IGBT in the motor drive system to actively short-circuit; and / or, the three-phase current overcurrent detection circuit in the power domain controller detects whether the three-phase current in the motor drive system is greater than the hardware overcurrent protection threshold, and when it detects that the three-phase current is greater than the hardware overcurrent protection current threshold, it triggers the hardware active short-circuit protection circuit to control the IGBT in the motor drive system to actively short-circuit.

[0083] Exemplarily, the software overvoltage protection threshold is less than the hardware overvoltage protection threshold, and the software overcurrent protection threshold is less than the hardware overcurrent protection threshold.

[0084] The specific implementation manner of triggering the hardware active short-circuit protection circuit to control the IGBT in the motor drive system to actively short-circuit is similar to the above, and will not be elaborated here.

[0085] The embodiments of the present application also provide a vehicle, which includes a vehicle body and the power domain controller provided by the above embodiments.

[0086] Finally, it should be noted that those skilled in the art will easily think of other implementation manners of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention, which follow the general principles of the present invention and include the common general knowledge or conventional technical means in the technical field not disclosed in the present invention. It is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A power domain controller, characterized in that: include: A hardware active short-circuit protection circuit and a bus voltage overvoltage detection circuit and a three-phase current overcurrent detection circuit connected to the hardware active short-circuit protection circuit; Wherein, the bus voltage overvoltage detection circuit is used to detect whether the bus voltage in the motor drive system is greater than the hardware overvoltage protection threshold, and when it is detected that the bus voltage is greater than the hardware overvoltage protection threshold, the hardware active short-circuit protection circuit is triggered to control the insulated gate bipolar transistor IGBT in the motor drive system to actively short-circuit; The three-phase current overcurrent detection circuit is used to detect whether the three-phase current in the motor drive system is greater than the hardware overcurrent protection current threshold, and when it is detected that the three-phase current is greater than the hardware overcurrent protection current threshold, the hardware active short-circuit protection circuit is triggered to control the IGBT in the motor drive system to actively short-circuit.

2. The power domain controller according to claim 1, characterized in that: The bus voltage overvoltage detection circuit comprises: a first comparator, wherein the positive input terminal of the first comparator is used to input the hardware overvoltage protection threshold, the negative input terminal of the first comparator is connected to the output terminal of the bus voltage detection circuit, and the output terminal of the first comparator is connected to the input terminal of the hardware active short circuit protection circuit; The first comparator is used to output a first level when the bus voltage is greater than or equal to the hardware overvoltage protection threshold, and to output a second level when the bus voltage is less than the hardware overvoltage protection threshold.

3. The power domain controller according to claim 1, characterized in that: The three-phase current overcurrent detection circuit comprises: a second comparator, the positive input terminal of the second comparator is used to input the hardware overcurrent protection threshold, the negative input terminal of the second comparator is connected to the output terminal of the three-phase current detection circuit, and the output terminal of the second comparator is connected to the input terminal of the hardware active short-circuit protection circuit; The second comparator is used to output a first level when the three-phase current is greater than or equal to the hardware overcurrent protection threshold, and to output a second level when the three-phase current is less than the hardware overcurrent protection threshold.

4. The power domain controller according to claim 1, characterized in that: The hardware active short-circuit protection circuit comprises: a buffer, a first input end of the buffer is connected to the output end of the bus voltage overvoltage detection circuit, and a second input end of the buffer is connected to the output end of the three-phase current overcurrent detection circuit; The buffer is used to control the IGBT in the motor drive system to actively short-circuit when receiving the first level.

5. The power domain controller according to any one of claims 1 to 4, characterized in that: Also includes: A dog feeding signal hardware detection circuit, wherein the input end of the dog feeding signal hardware detection circuit is used to input the dog feeding signal, the output end of the dog feeding signal hardware detection circuit is connected to the input end of the hardware active short-circuit protection circuit, and the dog feeding signal hardware detection circuit is used to detect whether the dog feeding signal is normal, and trigger the hardware active short-circuit protection circuit when an abnormal dog feeding signal is detected.

6. The power domain controller according to any one of claims 1 to 4, characterized in that: Also includes: An anti-reverse connection circuit is provided between the power supply and the power input terminal of the power domain controller, and the anti-reverse connection circuit is used to cut off the power supply circuit when reverse connection of the power supply is detected.

7. The power domain controller according to claim 6, characterized in that: The anti-reverse connection circuit includes an NMOS tube, a PMOS tube, an NMOS tube driving circuit and a PMOS tube driving circuit; The input end of the NMOS tube driving circuit and the source of the NMOS tube are both connected to the positive terminal of the power supply, the first output end of the NMOS tube driving circuit is connected to the gate of the NMOS tube, and the second output end of the NMOS tube driving circuit is connected to the negative terminal of the power supply; The input end of the PMOS tube driving circuit and the source of the PMOS tube are both grounded, the first output end of the PMOS tube driving circuit is connected to the gate of the PMOS tube, the second output end of the PMOS tube driving circuit is connected to the drain of the NMOS tube, and the drain of the PMOS tube is connected to the negative terminal of the power supply.

8. The power domain controller according to claim 7, characterized in that: The NMOS tube driving circuit includes a first resistor, a second resistor, a first transient suppression diode and a capacitor, wherein: The first end of the first resistor, the positive terminal of the first transient suppression diode and the first end of the capacitor are connected to form an input end of the NMOS tube driving circuit; The second end of the first resistor, the negative terminal of the first transient suppression diode, the second end of the capacitor, and the first end of the second resistor are connected to form a first output end of the NMOS tube driving circuit; The second end of the second resistor is the second output end of the NMOS tube driving circuit.

9. The power domain controller according to claim 7, characterized in that: The PMOS tube driving circuit includes a third resistor, a fourth resistor, and a second transient suppression diode, wherein: The first end of the third resistor is connected to the negative terminal of the second transient suppression diode to form an input end of the PMOS tube driving circuit; The second end of the third resistor, the positive end of the second transient suppression diode and the first end of the fourth resistor are connected to form a first output end of the PMOS tube driving circuit; The second end of the fourth resistor is the second output end of the PMOS tube driving circuit.

10. The power domain controller according to claim 6, characterized in that: The anti-reverse connection circuit comprises a diode, a positive terminal of the diode is connected to a positive terminal of a power supply, and a negative terminal of the diode is connected to a negative terminal of the power supply.

11. The power domain controller according to any one of claims 1 to 4, characterized in that: Also includes: The MCU is used to detect the bus voltage and three-phase current in the motor drive system in real time, and when it is detected that the bus voltage is greater than the software overvoltage protection threshold, or the three-phase current is greater than the software overcurrent protection threshold, the control software strategy is triggered, and the software strategy is used to control the IGBT to actively short-circuit, the software overvoltage protection threshold is less than the hardware overvoltage protection threshold, and the software overcurrent protection threshold is less than the hardware overcurrent protection threshold.

12. A vehicle, characterized in that: The vehicle comprises a vehicle body and a power domain controller as claimed in any one of claims 1 to 11.

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