Protection circuit, motor control circuit, method and module, controller and vehicle

Abstract

Disclosed in the present application are a protection circuit, a protection control method for an electric drive system, an electric drive system and a vehicle. The protection circuit comprises a sampling module and a control module, the sampling module being used for obtaining a plurality of sampling signals of an electric drive system, and the control module being connected to the sampling module and being used for executing a protection measure for the electric drive system when at least two of the plurality of sampling signals of the electric drive system are abnormal. The protection circuit can acquire a plurality of signals for comprehensive processing; since the signal processing is all performed within the control module, there is no need for an additional external signal processing circuit, thereby optimizing the overall structure; in addition, by taking a plurality of different types of sampling signals into consideration, it can be comprehensively determined whether to protect an electric drive system, thereby improving safety and reliability and avoiding misjudgment caused by abnormal sampling or damage of sampling modules.

Description

Protection circuits, motor control circuits, methods and modules, controllers and vehicles

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411748818.1, filed on November 29, 2024, entitled "Motor Control Circuit, Method and Module, Storage Medium, Controller and Vehicle", and Chinese Patent Application No. 202411918068.8, filed on December 20, 2024, entitled "Protection Circuit, Protection Control Method for Electric Drive System, Electric Drive System and Vehicle", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of vehicle technology, and in particular to a protection circuit, a motor control circuit, a motor control method, a motor protection module, a protection control method for an electric drive system, an electric drive system, a computer-readable storage medium, a controller, and a vehicle. Background Technology

[0004] In related technologies, when an electric drive system malfunctions and fault handling is required to protect the vehicle and personnel safety, voltage signals are typically collected. The analysis of these voltage samples determines whether electric drive protection should be activated; if so, a protection signal is output. However, malfunctions or damage to the voltage sampling module can lead to misjudgments, resulting in low safety and reliability.

[0005] For new energy vehicle powertrains or industrial inverters that use permanent magnet synchronous motors, if the motor controller malfunctions severely, such as over-temperature, over-current, or over-voltage, when the motor is running at high speed, it will execute a shutdown operation. At this time, the permanent magnet is still rotating at high speed, which will generate a high back electromotive force on the three-phase windings of the motor.

[0006] To address this situation, an Active Short Circuit (ASC) scheme is typically employed. This involves short-circuiting the motor stator windings by fully conducting the switching transistors in either the upper or lower arm of the inverter in the motor drive circuit. However, executing the ASC scheme requires the inverter itself to be in a controllable state and the switching transistors to function normally. If the inverter itself is faulty, the ASC scheme cannot be executed directly, resulting in excessively high back electromotive force that flows back through the freewheeling diodes of the switching transistors to the bus capacitor and battery pack. Summary of the Invention

[0007] Some embodiments of this application provide a protection circuit, a motor control circuit, a method and module, a storage medium, a controller, and a vehicle to at least partially solve the problems existing in the prior art.

[0008] Firstly, some embodiments of this application provide a protection circuit that can collect and process multiple signals. All signal processing is done within the control module, eliminating the need for additional external signal processing circuits. This optimizes the overall structure and, by considering multiple different types of sampling signals, comprehensively determines whether to protect the electric drive system, thereby improving safety and reliability and preventing misjudgments caused by abnormal sampling or damage to the sampling module.

[0009] Some embodiments of this application provide a protection circuit, including: a sampling module for obtaining multiple sampling signals of an electric drive system; and a control module connected to the sampling module for executing protection measures for the electric drive system when at least two sampling signals of the electric drive system are abnormal.

[0010] According to some embodiments of the protection circuit of this application, the sampling module collects various types of sampling signals from the electric drive system and transmits the collected signals to the control module. All signal processing is performed within the control module, eliminating the need for additional external signal processing circuits. This optimizes the overall structure. By considering various types of sampling signals, a comprehensive decision is made on whether to protect the electric drive system, thereby improving safety and reliability and preventing misjudgments caused by sampling module malfunctions or damage.

[0011] In some embodiments, the protection circuit includes: a circuit breaker connected to a power control unit and also connected to a power supply for power supply; the circuit breaker is adapted to be connected between the intelligent power module of the electric drive system and the motor windings of the electric drive system; the circuit breaker is used to disconnect in response to a cut-off signal to protect the electric drive system.

[0012] In some embodiments, the protection circuit further includes a power supply connected to the power supply terminal of the circuit breaker to supply power to the circuit breaker; and a control module connected to the power supply and the circuit breaker to cut off the power supply to the circuit breaker when at least two sampling signals are abnormal, so as to disconnect the circuit breaker.

[0013] In some embodiments, the control module includes: a main control unit connected to the sampling module, used to issue a protection control signal when at least two sampling signals of the electric drive system are abnormal; and a power control unit connected to the main control unit, a power supply, and a circuit breaker, used to issue a cut-off signal in response to the protection control signal to cut off the power supply from the power supply to the circuit breaker.

[0014] In some embodiments, the power control unit includes: a power control trigger subunit, a first terminal of which is connected to the main control unit, a second terminal of which is connected to the power supply, and a third terminal of which is connected to a preset power supply. The power control trigger subunit is used to issue a power disconnection trigger signal in response to a protection control signal.

[0015] In some embodiments, the power control unit further includes: a power connection control subunit, a first terminal of which is connected to a fourth terminal of a power control trigger subunit, a second terminal of which is connected to a power supply, and a third terminal of which is connected to a circuit breaker, for disconnecting the power supply to the circuit breaker in response to a power disconnection trigger signal, so as to issue a disconnection signal.

[0016] In some embodiments, the power control trigger subunit includes: a first resistor, a first end of which is connected to a preset power supply, and a second end of which is connected to a main control unit; a second resistor, a first end of which is connected to a second end of the first resistor and the main control unit; a third resistor, a first end of which is connected to the main control unit, the second end of the first resistor, and the first end of the second resistor, and a second end of the third resistor is grounded; and a first switching transistor, a control terminal of which is connected to a second end of the second resistor, a first end of which is connected to the power connection control subunit, a second end of which is connected to a second end of the third resistor, and a second end of which is grounded.

[0017] In some embodiments, the power connection control subunit includes: a fourth resistor, the first end of which is connected to the power supply of the circuit breaker, and the second end of which is connected to the first end of the first switching transistor; and a second switching transistor, the control terminal of which is connected to the first end of the first switching transistor and the second end of the fourth resistor, the first end of which is connected to the power supply of the circuit breaker and the first end of the fourth resistor, and the second end of which is connected to the circuit breaker.

[0018] In some embodiments, when the main control unit does not issue a protection control signal, the main control unit outputs a low-level signal to the power supply control unit. The preset power supply is grounded through the first resistor, the control terminal of the first switch is at a low level, the first switch is not conducting, the power supply of the circuit breaker is blocked by the first switch through the fourth resistor, the control terminal of the second switch is at a high level, the second switch is not conducting, and the circuit breaker is in a closed state.

[0019] In some embodiments, when the main control unit issues a protection control signal, the main control unit outputs a high-level signal to the power control unit. The preset power supply is supplied to the control terminal of the first switching transistor through the first resistor and the second resistor. When the control terminal of the first switching transistor is at a high level, the first switching transistor is turned on. The power supply of the circuit breaker is grounded through the fourth resistor and the first switching transistor. When the control terminal of the second switching transistor is at a low level, the second switching transistor is turned on. The circuit breaker is disconnected to cut off the connection between the intelligent power module and the motor winding of the electric drive system.

[0020] In some embodiments, the circuit breaker includes: a circuit breaker switch adapted to be connected between the intelligent power module of the electric drive system and the motor windings of the electric drive system, for disconnecting in response to a power failure signal.

[0021] In some embodiments, the sampling module is at least one of a speed sampling circuit and a copper busbar temperature sampling circuit. The speed sampling circuit is used to acquire the resolver signal corresponding to the motor speed, and the copper busbar temperature sampling circuit is used to acquire the temperature of each copper busbar of the intelligent power module of the electric drive system.

[0022] In some embodiments, the speed sampling circuit and / or the copper busbar temperature sampling circuit are integrated into the circuit breaker.

[0023] In some embodiments, the sampling module includes at least two types of sampling circuits: a bus voltage sampling circuit, connected to the control module, for acquiring the bus voltage signal of the electric drive system; a current sampling circuit, connected to the control module, for acquiring the winding current signal of the motor in the electric drive system; a temperature sampling circuit, connected to the control module, for acquiring the temperature signal of the target component in the electric drive system; a speed sampling circuit, connected to the control module, for acquiring the resolver signal corresponding to the motor speed; and an intelligent power module fault detection circuit, connected to the control module, for obtaining the fault detection signal of the intelligent power module.

[0024] In some embodiments, the bus voltage sampling circuit includes: a first differential operation circuit, a first terminal of which is adapted to be connected to the positive bus and the negative bus of the electric drive system, and a second terminal of which is connected to the control module for generating a bus voltage signal.

[0025] In some embodiments, the bus voltage sampling circuit further includes at least one of the following: a first filtering circuit, which is adapted to be connected to the positive terminal of the bus, the negative terminal of the bus, and the first differential operation circuit to filter the input bus signal; a second filtering circuit, which is connected to the first differential operation circuit and the control module to filter the bus voltage signal; and a first clamping circuit, which is at least connected to the control module.

[0026] In some embodiments, the current sampling circuit includes: a voltage divider circuit adapted to be connected to the motor windings to obtain a voltage divider signal; and a voltage follower connected to the control module to amplify the voltage divider signal and send the amplified voltage divider signal to the control module to obtain the corresponding winding current signal.

[0027] In some embodiments, the current sampling circuit further includes: a third filtering circuit, which is connected to the voltage divider circuit and the voltage follower, for filtering the voltage divider signal; and a fourth filtering circuit, which is connected to the voltage follower and the control module, for filtering the amplified voltage divider signal.

[0028] In some embodiments, the current sampling circuit further includes a second clamping circuit, which is connected to the fourth filtering circuit and the control module.

[0029] In some embodiments, the rotational speed sampling circuit is a resolver decoding chip, which is connected to the control module to obtain the resolver signal.

[0030] In some embodiments, the intelligent power module fault detection circuit includes: an upper bridge fault detection circuit, adapted to be connected to the upper bridge circuit of the intelligent power module, for detecting faults in the upper bridge circuit to obtain upper bridge fault detection information.

[0031] In some embodiments, the intelligent power module fault detection circuit further includes a fifth filter circuit, connected to the upper bridge fault detection circuit and the control module, for filtering the upper bridge fault detection information.

[0032] In some embodiments, the intelligent power module fault detection circuit further includes: a lower bridge fault detection circuit, adapted to be connected to the lower bridge circuit of the intelligent power module, for detecting faults in the lower bridge circuit to obtain lower bridge fault detection information.

[0033] In some embodiments, the intelligent power module fault detection circuit further includes a sixth filtering circuit, connected to the lower bridge fault detection circuit and the control module, for filtering the lower bridge fault detection information.

[0034] In some embodiments, the temperature sampling circuit includes at least one of the following: a winding temperature sampling circuit for acquiring the winding temperature of the motor in the electric drive system; a copper busbar temperature sampling circuit for acquiring the copper busbar temperature of the intelligent power module in the electric drive system; and an internal temperature sampling circuit for acquiring the internal temperature of the intelligent power module.

[0035] In some embodiments, the temperature sampling circuit includes multiple winding temperature sampling circuits, which are connected to the control module and are used to collect the temperature of each phase winding of the motor respectively.

[0036] In some embodiments, the temperature sampling circuit includes multiple copper busbar temperature sampling circuits, which are connected to the control module and are used to collect the copper busbar temperature of each copper busbar of the intelligent power module.

[0037] In some embodiments, the temperature sampling circuit includes multiple internal temperature sampling circuits located within the intelligent power module, which are used to collect temperature signals from different locations within the intelligent power module.

[0038] In some embodiments, the temperature sampling circuit includes: a non-inverting amplifier circuit, which is connected to a temperature sensor for detecting the temperature of a target component and a control module, for amplification processing, and sends the amplified temperature signal to the control module.

[0039] In some embodiments, the temperature sampling circuit further includes at least one of the following: a seventh filtering circuit, which is adapted to be connected to the temperature sensor and the in-phase amplifier circuit to filter the temperature signal detected by the temperature sensor; and an eighth filtering circuit, which is connected to the in-phase amplifier circuit and the control module to filter the amplified temperature signal.

[0040] In some embodiments, the temperature sampling circuit further includes at least one of the following: a pull-up power supply circuit adapted to be connected to a temperature sensor and a preset power supply; and a third clamping circuit connected to an eighth filter circuit and a control module.

[0041] Secondly, some embodiments of this application provide a protection control method for an electric drive system, used in the protection circuit of any of the embodiments of the first aspect described above. The protection control method includes: acquiring multiple sampling signals of the electric drive system; and executing protection measures for the electric drive system when at least two of the multiple sampling signals of the electric drive system are abnormal.

[0042] According to some embodiments of the present application, the protection and control method for an electric drive system acquires multiple sampling signals in the electric drive system in real time and transmits the acquired signals to the control module. By considering multiple sampling signals, a comprehensive decision is made on whether to protect the electric drive system. When at least two types of sampling signals among the multiple sampling signals are abnormal, the controller executes protection measures for the electric drive system, thereby improving safety and reliability and avoiding misjudgment caused by sampling module abnormality or damage.

[0043] In some embodiments, the various sampling signals of the electric drive system include at least two of the following: bus voltage signal, motor winding current signal, temperature signal of the target component of the electric drive system, resolver signal corresponding to motor speed, and fault detection signal of intelligent power module.

[0044] In some embodiments, the temperature signal of the target component of the electric drive system includes at least one type of temperature signal, such as the winding temperature of the motor, the plate temperature of the intelligent power module, and the internal temperature of the intelligent power module.

[0045] In some embodiments, implementing protection measures for the electric drive system includes sending a protection control signal to cut off the power supply to the circuit breaker between the intelligent power module connected to the electric drive system and the motor of the electric drive system, thereby disconnecting the intelligent power module from the motor.

[0046] Thirdly, some embodiments of this application provide an electric drive system including the protection circuit of any of the embodiments of the first aspect described above.

[0047] According to some embodiments of the present application, the electric drive system has a protection circuit that acquires various types of sampling signals in the electric drive system in real time and transmits the acquired signals to the control module. By considering various types of sampling signals, the controller comprehensively decides whether to protect the electric drive system. When at least two types of sampling signals are abnormal, the controller performs protection measures for the electric drive system, thereby improving safety and reliability and avoiding misjudgment when the sampling module is abnormal or damaged.

[0048] In some embodiments, the electric drive system further includes a drive module, an intelligent power module, and a motor. The drive module is connected to the intelligent power module and is also connected to the control module in the protection circuit. The motor is connected to the intelligent power module through a circuit breaker in the protection circuit.

[0049] Fourthly, some embodiments of this application provide a vehicle including the electric drive system of any of the embodiments of the first aspect described above.

[0050] According to some embodiments of the present application, the protection circuit acquires multiple sampling signals from the electric drive system in real time and transmits the acquired signals to the control module. By considering multiple sampling signals, it comprehensively decides whether to protect the electric drive system. When at least two types of sampling signals are abnormal, the controller executes protection measures for the electric drive system, thereby improving safety and reliability and avoiding misjudgment caused by sampling module abnormality or damage.

[0051] Fifthly, some embodiments of this application provide a motor control circuit, which includes: a detection circuit for detecting a detection parameter generated by the back electromotive force generated by the motor; and a protection circuit for disconnecting the motor from the motor drive circuit when the detection parameter meets a first condition.

[0052] In some embodiments, the detected parameters include at least one of current and temperature.

[0053] In some embodiments, the detection circuit is further configured to: detect a detection parameter generated by the back electromotive force generated by the motor in response to a fault in the inverter in the motor drive circuit and / or a fault in the inverter drive circuit.

[0054] In some embodiments, the detection circuit includes a current sensor for detecting the phase current of each phase cable between the inverter and the motor.

[0055] In some embodiments, the detection circuit includes a first temperature sensor for detecting the temperature of each arm of the inverter.

[0056] In some embodiments, the detection circuit includes a second temperature sensor for detecting the temperature of each phase cable between the inverter and the motor.

[0057] In some embodiments, the detection circuit includes a third temperature sensor for detecting the temperature of each winding in the motor.

[0058] In some embodiments, the motor control circuit further includes a controller that connects the detection circuit and the protection circuit, the controller being used to control the protection circuit to disconnect according to the detection parameters.

[0059] In some embodiments, the protection circuit includes a switch for disconnecting the motor from the motor drive circuit under the control of the controller.

[0060] In some embodiments, a switch is provided on each phase cable between the inverter and the motor in the motor drive circuit.

[0061] In some embodiments, the protection circuit includes a fuse for disconnecting the motor from the motor drive circuit under the control of the controller.

[0062] In some embodiments, the fuse is connected to a first power source; a fuse is installed on each phase cable between the inverter and the motor in the motor drive circuit; the first power source is used to provide a fusing current to the fuse under the control of the controller, and the fuse is used to disconnect the connection between the motor and the motor drive circuit under the action of the fusing current.

[0063] In some embodiments, the controller includes a detection module for detecting faults in the inverter and / or the inverter's drive circuit in the motor drive circuit.

[0064] Sixthly, some embodiments of this application also provide a motor control method, including: controlling a protection circuit to disconnect the motor from the motor drive circuit based on a detection parameter generated by the back electromotive force generated by the motor.

[0065] In some embodiments, the method further includes: detecting a detection parameter generated by the back electromotive force generated by the motor in response to a fault in the inverter in the motor drive circuit and / or a fault in the drive circuit of the inverter.

[0066] In some embodiments, the control protection circuit maintains or disconnects the connection between the motor and the motor drive circuit based on the detection parameters generated by the back electromotive force generated by the motor, including: when the detection parameters meet a first condition, the protection circuit disconnects the connection between the motor and the inverter.

[0067] In some embodiments, when the detection parameter meets the first condition, the protection circuit disconnects the connection between the motor and the motor drive circuit, including: when the absolute value of the phase current integral value of any phase cable connected to the inverter is greater than the first threshold, controlling at least two phases of the multiphase cable between the inverter and the motor to disconnect.

[0068] In some embodiments, when the detected parameter meets the first condition, the protection circuit disconnects the connection between the motor and the motor drive circuit, including: when the temperature difference between two of the multiple arms of the inverter is greater than a first temperature difference threshold, controlling at least two phases of the multiphase cable between the inverter and the motor to disconnect.

[0069] In some embodiments, when the detected parameter meets the first condition, the protection circuit disconnects the connection between the motor and the motor drive circuit, including: when the temperature of each of the multiple arms of the inverter is greater than the temperature of the first arm, controlling at least two phases of the multiphase cable between the inverter and the motor to disconnect.

[0070] In some embodiments, when the detection parameter meets the first condition, the protection circuit disconnects the connection between the motor and the motor drive circuit, including: when the temperature difference between two phases of the multiphase cable between the inverter and the motor is greater than a second temperature difference threshold, controlling at least two phases of the multiphase cable to disconnect.

[0071] In some embodiments, when the detection parameter meets the first condition, the protection circuit disconnects the connection between the motor and the motor drive circuit, including: when the temperature of each phase of the multiphase cable between the inverter and the motor is greater than the temperature of the first cable, controlling at least two phases of the multiphase cable to disconnect.

[0072] In some embodiments, when the detected parameter meets the first condition, the protection circuit disconnects the connection between the motor and the motor drive circuit, including: when the temperature difference between two windings of the plurality of windings in the motor is greater than a third temperature difference threshold, controlling at least two phases of the multiphase cable between the inverter and the motor to disconnect.

[0073] In some embodiments, when the detected parameter meets the first condition, the protection circuit disconnects the connection between the motor and the motor drive circuit, including: when the temperature of each of the multiple windings in the motor is greater than the temperature of the first winding, controlling at least two phases of the multiphase cable between the inverter and the motor to disconnect.

[0074] In a seventh aspect, some embodiments of this application also provide a computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the steps of the method of any of the embodiments of the sixth aspect described above.

[0075] Eighthly, some embodiments of this application also provide a controller having a computer program stored thereon, which, when executed by a processor, implements the steps of the method of any of the embodiments of the sixth aspect described above.

[0076] Ninthly, some embodiments of this application also provide a motor control module, including the motor control circuit in any of the embodiments of the fifth aspect above.

[0077] In a tenth aspect, some embodiments of this application also provide a vehicle including the motor control module in any of the embodiments of the ninth aspect above, or including the motor control circuit in any of the embodiments of the fifth aspect above.

[0078] In summary, the fifth aspect of this application provides a motor control circuit, which includes a detection circuit and a protection circuit. The detection circuit is used to detect a detection parameter generated by the back electromotive force generated by the motor; the protection circuit is used to maintain or disconnect the connection between the motor and the motor drive circuit. By disconnecting the connection between the motor and the motor drive circuit when the detection parameter meets a first condition, the problem of excessively high back electromotive force causing reverse current flow to the bus capacitor and battery pack through the freewheeling diode of the switching transistor, which cannot be directly executed, is at least partially solved, effectively avoiding current reverse flow caused by a fault in the inverter itself.

[0079] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0080] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0081] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0082] Figure 1 is a structural block diagram of a protection circuit according to some embodiments of this application;

[0083] Figure 2 is a schematic diagram of a protection circuit according to some embodiments of this application;

[0084] Figure 3 is a schematic diagram of a power output control circuit according to some embodiments of this application;

[0085] Figure 4 is a structural block diagram of a sampling module according to some embodiments of this application;

[0086] Figure 5 is a schematic diagram of a bus voltage sampling circuit according to some embodiments of this application;

[0087] Figure 6 is a schematic diagram of a current sampling circuit according to some embodiments of this application;

[0088] Figure 7 is a schematic diagram of a resolver sampling circuit according to some embodiments of this application;

[0089] Figure 8 is a schematic diagram of a fault detection circuit for an intelligent power module according to some embodiments of this application;

[0090] Figure 9 is a schematic diagram of a temperature sampling circuit according to some embodiments of this application;

[0091] Figure 10 is a schematic diagram of a copper busbar temperature sampling circuit according to some embodiments of this application;

[0092] Figure 11 is a schematic diagram of a motor winding temperature sampling circuit according to some embodiments of this application;

[0093] Figure 12 is a flowchart of a protection control method for an electric drive system according to some embodiments of this application;

[0094] Figure 13 is a schematic diagram of three-phase protection control according to some embodiments of this application;

[0095] Figure 14 is a structural block diagram of an electric drive system according to some embodiments of this application;

[0096] Figure 15 is a structural block diagram of a vehicle according to some embodiments of this application;

[0097] Figure 16 is a schematic diagram of a motor control circuit provided in some embodiments of this application;

[0098] Figure 17 is a schematic diagram of another motor control circuit provided in some embodiments of this application;

[0099] Figure 18 is a schematic diagram of another motor control circuit provided in some embodiments of this application;

[0100] Figure 19 is a schematic diagram of another motor control circuit provided in some embodiments of this application;

[0101] Figure 20 is a flowchart of a motor control method provided in some embodiments of this application;

[0102] Figure 21 is a flowchart of a motor control method provided in some embodiments of this application;

[0103] Figure 22 is a flowchart of yet another motor control method provided in some embodiments of this application;

[0104] Figure 23 is a flowchart of yet another motor control method provided in some embodiments of this application;

[0105] Figure 24 is a flowchart of yet another motor control method provided in some embodiments of this application;

[0106] Figure 25 is a schematic diagram of the structure of a motor protection module provided in some embodiments of this application;

[0107] Figure 26 is a structural schematic diagram of a vehicle provided in some embodiments of this application.

[0108] Reference numerals: Vehicle 900; Electric drive system 800; Protection circuit 100; Drive module 801; Intelligent power module 802; Motor 803; Sampling module 110; Control module 120; Main control unit 121; Power control unit 122; Power supply 123; Circuit breaker 130; Power control trigger subunit 21; Power connection control subunit 22; First resistor R64; Second resistor R65; Third resistor R66; First switch Q1; Fourth resistor R67; Second switch Q2; Circuit breaker 131; Speed ​​sampling circuit 101; Copper busbar temperature sampling circuit 102; Bus voltage sampling circuit 103; Current sampling circuit 104; Temperature sampling circuit 10; Intelligent power module fault detection circuit 105; Winding temperature sampling circuit 106; Internal temperature sampling circuit 107; First differential operation circuit 301; First filter circuit 302; Second filter circuit 303; First clamping circuit 304; Voltage divider circuit 401; Third filter circuit 402; Voltage follower 403; Fourth filter circuit 404; Second clamping circuit 405; Upper bridge fault detection circuit 501; Fifth filter circuit 502; Lower bridge fault detection circuit 503; Sixth filter circuit 504; Pull-up power supply circuit 11; Seventh filter circuit 12; Non-inverting proportional amplifier circuit 13; Eighth filter circuit 14; Third clamping circuit 15. Detailed Implementation

[0109] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0110] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0111] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0112] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0113] The various embodiments provided in this application are similar, and features in different embodiments can be combined or substituted for each other without conflict.

[0114] The use of "configured as" and "used for" in the embodiments of this application implies an open and inclusive language, which does not exclude the applicability to or configuration of devices to perform additional tasks or steps.

[0115] The order in which the following embodiments are described is not intended to limit the preferred order of the embodiments.

[0116] In existing technologies, the safety of new energy vehicles has always been a key concern for automakers and users. During the process of the electric drive system transferring energy from the battery pack to the three-phase motor to drive the vehicle, if a fault occurs in the electric drive system, fault handling measures are needed to protect the vehicle and its occupants. A common solution is to use a three-phase active short circuit in case of a fault at high speed, and then use a six-bridge open circuit after the vehicle speed decreases. This solution is implemented by controlling the switching transistors of the three-phase inverter bridge. After the fault disappears, the IPM (Intelligent Power Module) can work normally to drive the motor (vehicle movement). However, in the case of a three-phase inverter module fault, back electromotive force may be generated, causing uncontrollable damage to the three-phase inverter module and battery pack (such as the three-phase inverter module switching transistors exploding or burning). Therefore, when a fault is detected, the vehicle speed is limited. Another comprehensive solution is to make a decision based on information such as three-phase current, bus voltage, and motor speed when an IPM fault is detected. If the worst-case scenario could cause serious damage to the IPM and battery pack, the three-phase lines are actively disconnected to prevent back electromotive force from accumulating in the IPM and causing abnormal energy accumulation.

[0117] The existing three-phase protection circuit includes: three identical circuits for each phase and a signal generation circuit. Each phase circuit includes a sampling circuit and a status detection circuit. The sampling circuit is connected to the power module and outputs a voltage sampling signal based on the input voltage signal. The status detection circuit is connected to both the sampling circuit and the signal generation circuit and outputs undervoltage and phase loss status signals based on the voltage sampling signals. If any phase of the three-phase circuit experiences undervoltage or phase loss, the three-phase protection circuit will be triggered to generate a protection signal. This scheme only samples the three-phase voltage before outputting the protection signal, which may lead to misjudgments. Furthermore, the final action for the protection signal is not clearly defined, and the three-phase voltage sampling is relatively simplistic for electric drive systems.

[0118] To address the above issues, firstly, some embodiments of this application provide a protection circuit that can collect and process multiple signals. All signal processing is performed within the control module, eliminating the need for external signal processing circuits. This optimizes the overall structure and, by considering various types of sampling signals, comprehensively determines whether to protect the electric drive system, thereby improving safety and reliability and preventing misjudgments caused by sampling module malfunctions or damage.

[0119] As shown in Figure 1, the protection circuit 100 includes a sampling module 110 and a control module 120.

[0120] The sampling module 110 is used to obtain multiple sampling signals of the electric drive system; the control module 120 is connected to the sampling module 110 and is used to perform protection measures for the electric drive system when at least two sampling signals of the electric drive system are abnormal.

[0121] Specifically, the sampling module 110 acquires multiple sampling signals from the electric drive system, including two or more sampling signals. The control module 120 is connected to the sampling module 110. The control module 120 continuously receives and analyzes the signals transmitted from the sampling module 110. If the control module 120 detects that at least two of the sampling signals in the electric drive system are abnormal, it indicates that the electric drive system may be malfunctioning. In this case, the control module 120 will respond quickly and implement protective measures for the electric drive system.

[0122] According to some embodiments of the protection circuit of this application, the sampling module collects various types of sampling signals from the electric drive system and transmits the collected signals to the control module. All signal processing is performed within the control module, eliminating the need for additional external signal processing circuits. This optimizes the overall structure. By considering various types of sampling signals, a comprehensive decision is made on whether to protect the electric drive system, thereby improving safety and reliability and preventing misjudgments caused by sampling module malfunctions or damage.

[0123] In some embodiments, as shown in FIG2, the protection circuit 100 includes a circuit breaker 130.

[0124] The circuit breaker 130 is connected to the power control unit 122 and is also connected to the power supply 123 shown in Figure 3 for power supply. The circuit breaker 130 is adapted to be connected between the intelligent power module of the electric drive system and the motor winding of the electric drive system. The circuit breaker 130 is used to disconnect in response to a cut-off signal to protect the electric drive system.

[0125] Specifically, when the power control unit 122 sends a cut-off signal, the circuit breaker 130 disconnects, and the intelligent power module is disconnected from the motor winding, thereby effectively preventing the current from continuing to flow and avoiding further spread of faults or potential risks.

[0126] In some embodiments, as shown in FIG3, the protection circuit 100 includes a power supply 123.

[0127] The power supply 123 is connected to the power supply terminal of the circuit breaker 130 to supply power to the circuit breaker.

[0128] Specifically, the control module 120 is connected to the power supply 123 and the circuit breaker 130. When the sampling module 110 receives at least two abnormal sampling signals, the control module 120 cuts off the power supply from the power supply 123 to the circuit breaker 130 so that the circuit breaker 130 is disconnected.

[0129] In some embodiments, as shown in FIG1, the control module 120 includes a main control unit 121 and a power control unit 122.

[0130] The main control unit 121 is connected to the sampling module 110 and is used to issue a protection control signal when at least two sampling signals of the electric drive system are abnormal. The power control unit 122 is connected to the main control unit 121 and the power supply 123. The power control unit 122 is used to issue a cut-off signal in response to the protection control signal to cut off the connection between the intelligent power module and the motor winding in the electric drive system in order to protect the electric drive system.

[0131] Specifically, the main control unit 121 is connected to the sampling module 110 and acquires the sampling signals provided by the sampling module 110 in real time. When at least two sampling signals show abnormalities, the main control unit 121 will quickly identify and send a protection control signal to the power control unit 122. When the power control unit 122 receives the protection control signal from the main control unit 121, it will immediately respond and send a cut-off signal to cut off the power supply 123 to the circuit breaker 130, thereby cutting off the connection between the intelligent power module and the motor winding in the electric drive system. Even if the system has an abnormal situation, it can effectively prevent the fault from expanding further, thereby protecting the safe and stable operation of the entire electric drive system.

[0132] In some embodiments, as shown in FIG3, the power control unit 122 includes a power control trigger subunit 21.

[0133] Specifically, the first end of the power control trigger subunit 21 is connected to the main control unit 121, the second end of the power control trigger subunit 21 is connected to the power supply 123, and the third end of the power control trigger subunit 21 is connected to the preset power supply. The power control trigger subunit 21 is used to issue a power disconnect trigger signal in response to the protection control signal.

[0134] In some embodiments, as shown in FIG3, the power control unit 122 further includes a power connection control subunit 22.

[0135] Specifically, the first end of the power connection control subunit 22 is connected to the fourth end of the power control trigger subunit 21, the second end of the power connection control subunit 22 is connected to the power supply 123, and the third end of the power connection control subunit 22 is connected to the circuit breaker 130, in response to the power disconnection trigger signal, to cut off the power supply from the power supply 123 to the circuit breaker 130, so as to issue a disconnection signal.

[0136] In some embodiments, as shown in FIG3, the power control trigger subunit 21 includes: a first resistor R64, a second resistor R65, a third resistor R66, and a first switching transistor Q1.

[0137] Specifically, the first end of the first resistor R64 is connected to a preset power supply, and the second end of the first resistor R64 is connected to the main control unit 121; the first end of the second resistor R65 is connected to the second end of the first resistor R64 and the main control unit 121; the first end of the third resistor R66 is connected to the main control unit 121, the second end of the first resistor R64, and the first end of the second resistor R65, and the second end of the third resistor R66 is grounded; the control terminal of the first switch Q1 is connected to the second end of the second resistor R65, the first end of the first switch Q1 is connected to the power supply connection control subunit 22, the second end of the first switch Q1 is connected to the second end of the third resistor R66, and the second end of the first switch Q1 is grounded.

[0138] In some embodiments, as shown in FIG3, the power connection control subunit 22 includes: a fourth resistor R67 and a second switch Q2.

[0139] Specifically, the first end of the fourth resistor R67 is connected to the power supply 123 of the circuit breaker, and the second end of the fourth resistor R67 is connected to the first end of the first switch Q1; the control end of the second switch Q2 is connected to the first end of the first switch Q1 and the second end of the fourth resistor R67, the first end of the second switch Q2 is connected to the power supply 123 of the circuit breaker and the first end of the fourth resistor R67, and the second end of the second switch Q2 is connected to the circuit breaker 130.

[0140] In this embodiment, the first switch Q1 can be an NPN transistor, and the second switch Q2 can be a PMOS transistor. Alternatively, the first switch Q1 and the second switch Q2 can be any other switching or non-switching device that can perform the above functions.

[0141] As shown in Figure 3, when the control module decides not to output a protection signal after comprehensive analysis of the sampled data, the left-end main control unit 121 connected to the third resistor R66 outputs a low level (grounded). The VDD 3.3V power supply is grounded through the first resistor R64. The base of the connection point between the first switch Q1 and the second resistor R65 is at a low level. The collector and emitter of the first switch Q1 are not conducting. The +12V power supply is blocked by the first switch Q1 through the fourth resistor R67. At this time, the gate of the second switch Q2 is at a high level. The drain and source of the second switch Q2 are not conducting. There is no power at the power output terminal of the three-phase circuit breaker. When the control module performs comprehensive analysis of the sampled data and decides to output a protection signal, the left-end main control unit 121 connected to the third resistor R66 outputs a high level (VDD3.3V). The VDD3.3V power supply is pulled up through the first resistor R64 and the second resistor R65. The base of the first switch Q1 connected to the second resistor R65 is at a high level, and the collector and emitter of the first switch Q1 are turned on. The +12V power supply is grounded through the fourth resistor R67 and the first switch Q1. At this time, the gate of the second switch Q2 is at a low level, and the drain and source of the second switch Q2 are turned on. There is power at the power output terminal of the three-phase circuit breaker, and the three-phase circuit breaker will disconnect the three-phase copper busbar.

[0142] In some embodiments, as shown in FIG3, when the main control unit 121 does not issue a protection control signal, the main control unit 121 outputs a low-level signal to the power control unit 122, the preset power supply is grounded through the first resistor R64, the control terminal of the first switch Q1 is at a low level, the first switch Q1 is not conducting, the power supply 123 of the circuit breaker 130 is blocked by the first switch Q1 through the fourth resistor R67, the control terminal of the second switch Q2 is at a high level, the second switch Q2 is not conducting, and the circuit breaker 130 is in a closed state.

[0143] In some embodiments, as shown in FIG3, when the main control unit 121 issues a protection control signal, the main control unit 121 outputs a high-level signal to the power control unit 122. The preset power supply is connected to the control terminal of the first switch Q1 through the first resistor R64 and the second resistor R65. The control terminal of the first switch Q1 is at a high level, and the first switch Q1 is turned on. The power supply 123 of the circuit breaker 130 is grounded through the fourth resistor R67 and the first switch Q1. The control terminal of the second switch Q2 is at a low level, and the second switch Q2 is turned on. The circuit breaker 130 is disconnected to cut off the connection between the intelligent power module and the motor winding of the electric drive system.

[0144] In some embodiments, as shown in FIG2, the circuit breaker 130 includes a circuit breaker 131.

[0145] Specifically, the circuit breaker 131 is adapted to be connected between the intelligent power module of the electric drive system and the motor winding of the electric drive system, and is used to disconnect in response to an electrical cut-off signal.

[0146] In some embodiments, as shown in FIG4, the sampling module 110 can be at least one of the rotational speed sampling circuit 101 and the copper busbar temperature sampling circuit 102.

[0147] Specifically, the sampling module 110 can be at least one of the speed sampling circuit 101 and the copper busbar temperature sampling circuit 102. The speed sampling circuit 101 is used to collect the resolver signal corresponding to the motor speed, and the copper busbar temperature sampling circuit 102 is used to collect the temperature of each copper busbar of the intelligent power module of the electric drive system. The speed sampling circuit 101 and / or the copper busbar temperature sampling circuit 102 are integrated into the circuit breaker 130.

[0148] In some embodiments, the speed sampling circuit 101 and / or the copper busbar temperature sampling circuit 102 are integrated into the circuit breaker 130.

[0149] In some embodiments, as shown in FIG4, the sampling module 110 includes: a bus voltage sampling circuit 103, a current sampling circuit 104, an intelligent power module fault detection circuit 105, a speed sampling circuit 101, and a temperature sampling circuit 10 as shown in FIG4.

[0150] Specifically, the protection circuit 100 includes at least two types of sampling circuits selected from the following: bus voltage sampling circuit 103, current sampling circuit 104, intelligent power module fault detection circuit 105, speed sampling circuit 101, and temperature sampling circuit 10. The bus voltage sampling circuit 103 is connected to the control module 120 and is used to acquire the bus voltage signal of the electric drive system; the current sampling circuit 104 is connected to the control module 120 and is used to acquire the winding current signal of the motor in the electric drive system; the temperature sampling circuit 10 is connected to the control module 120 and is used to acquire the temperature signal of the target component in the electric drive system; the speed sampling circuit 101 is connected to the control module 120 and is used to acquire the resolver signal corresponding to the motor speed; and the intelligent power module fault detection circuit 105 is connected to the control module 120 and is used to obtain the fault detection signal of the intelligent power module.

[0151] In some embodiments, as shown in FIG5, the bus voltage sampling circuit 103 includes: a first differential operation circuit 301.

[0152] Specifically, the first terminal of the first differential operation circuit 301 is adapted to be connected to the positive terminal of the bus and the negative terminal of the bus of the electric drive system, and the second terminal of the first differential operation circuit 301 is connected to the control module to generate the bus voltage signal.

[0153] In some embodiments, as shown in FIG5, the bus voltage sampling circuit 103 includes at least one of a first filter circuit 302, a second filter circuit 303, and a first clamping circuit 304.

[0154] Specifically, the first filter circuit 302 is adapted to be connected to the positive terminal of the bus, the negative terminal of the bus, and the first differential operation circuit 301 to filter the input bus signal; the second filter circuit 303 is connected to the first differential operation circuit 301 and the control module 120 to filter the bus voltage signal; the first clamping circuit 304 is connected to the control module 120, or the first clamping circuit 304 is connected to the second filter circuit 303 and the control module 120. The first clamping circuit 304 may include the first clamping diode D1 in the figure. Further, as shown in the figure, the first clamping circuit 304 may also include a Zener diode to perform voltage stabilization.

[0155] For example, the bus voltage sampling circuit shown in Figure 5 includes a filtering circuit, a differential operation circuit, and a clamping circuit. The bus voltage sample is filtered by the first capacitor C1 and the second capacitor C2, then passed through the differential operation circuit composed of resistors R1, R2, R3, and R4, and the first operational amplifier IC1. Finally, it is clamped by the RC filter composed of the fifth resistor R5 and the third capacitor C3, and then output to the analog-to-digital converter of the control module for sampling.

[0156] In some embodiments, as shown in FIG6, the current sampling circuit 104 includes a voltage divider circuit 401 and a voltage follower 403.

[0157] The voltage divider circuit 401 is adapted to be connected to the motor winding to obtain a voltage divider signal; the voltage follower 403 is connected to the control module 120 to amplify the voltage divider signal and send the amplified voltage divider signal to the control module 120 to obtain the corresponding winding current signal.

[0158] In some embodiments, as shown in FIG6, the current sampling circuit 104 includes a third filter circuit 402 and a fourth filter circuit 404.

[0159] The third filter circuit 402 is connected to the voltage divider circuit 401 and the voltage follower 403 to filter the voltage divider signal; the fourth filter circuit 404 is connected to the voltage follower 403 and the control module 120 to filter the amplified voltage divider signal.

[0160] In some embodiments, as shown in FIG6, the current sampling circuit 104 further includes a second clamping circuit 405.

[0161] The second clamping circuit 405 is connected to the fourth filter circuit 404 and the control module 120.

[0162] For example, the three-phase current sampling circuit shown in Figure 6 includes a voltage divider circuit, a filter circuit, a voltage follower circuit, and a clamping circuit. In an embodiment, the second clamping circuit 405 may include a clamping diode. Further, as shown in the figure, the second clamping circuit 405 may also include a Zener diode to provide voltage regulation.

[0163] The U-phase current sample is divided to ground by the seventh resistor R7, then filtered by the RC filter composed of the sixth resistor R6 and the fourth capacitor C4, and then filtered by the second operational amplifier IC2 (voltage follower) and the RC filter composed of the eighth resistor R8 and the fifth capacitor C5, and clamped by the second clamping diode D2 before being output to the analog-to-digital converter of the control module for sampling.

[0164] The V-phase current sample is divided to ground by the tenth resistor R10, then filtered by the RC filter composed of the ninth resistor R9 and the sixth capacitor C6. After passing through the third operational amplifier IC3 (voltage follower) and the RC filter composed of the eleventh resistor R11 and the seventh capacitor C7, and clamped by the third clamping diode D3, the output is sent to the analog-to-digital converter of the control module for sampling.

[0165] The W-phase current sample is divided to ground by the thirteenth resistor R13, then filtered by the RC filter composed of the twelfth resistor R12 and the eighth capacitor C8. After passing through the fourth operational amplifier IC4 (voltage follower) and the RC filter composed of the fourteenth resistor R14 and the ninth capacitor C9, and clamped by the fourth clamping diode D4, the output is sent to the analog-to-digital converter of the control module for sampling.

[0166] In some embodiments, as shown in FIG7, the rotational speed sampling circuit is a resolver decoding chip, which is connected to the control module to obtain the resolver signal.

[0167] Specifically, as shown in Figure 7, the resolver sampling circuit uses a resolver decoding chip to provide an excitation signal to the resolver, while simultaneously sampling and decoding the SIN and COS signals, and finally outputting the signal to the control module's analog-to-digital converter for sampling.

[0168] In some embodiments, as shown in FIG8, the intelligent power module fault detection circuit 105 includes: an upper bridge fault detection circuit 501.

[0169] Specifically, the bridge fault detection circuit 501 is adapted to be connected to the bridge circuit of the intelligent power module to perform fault detection on the bridge circuit and obtain bridge fault detection information.

[0170] In some embodiments, as shown in FIG8, the intelligent power module fault detection circuit 105 further includes a fifth filter circuit 502.

[0171] Specifically, the fifth filter circuit 502 is connected to the upper bridge fault detection circuit 501 and the control module 120, and is used to filter the upper bridge fault detection information.

[0172] In some embodiments, as shown in FIG8, the intelligent power module fault detection circuit 105 includes a lower bridge fault detection circuit 503.

[0173] Specifically, the lower bridge fault detection circuit 503 is adapted to be connected to the lower bridge circuit of the intelligent power module to perform fault detection on the lower bridge circuit and obtain lower bridge fault detection information.

[0174] In some embodiments, as shown in FIG8, the intelligent power module fault detection circuit 105 further includes a sixth filter circuit 504.

[0175] Specifically, the sixth filter circuit 504 is connected to the lower bridge fault detection circuit 503 and the control module 120, and is used to filter the lower bridge fault detection information.

[0176] For example, the IPM fault detection circuit shown in Figure 8 includes a filtering circuit. The upper-bridge IPM fault detection circuit outputs its signal to the control module's GPIO (General-purpose input / output) port after being filtered by an RC filter composed of the 30th resistor R30 and the 19th capacitor C19. The lower-bridge IPM fault detection circuit outputs its signal to the control module's GPIO port after being filtered by an RC filter composed of the 31st resistor R31 and the 20th capacitor C20.

[0177] In some embodiments, as shown in FIG4, the temperature sampling circuit 10 includes at least one of the following: winding temperature sampling circuit 106, copper busbar temperature sampling circuit 102, and internal temperature sampling circuit 107.

[0178] Specifically, the winding temperature sampling circuit 106 is used to collect the winding temperature of the motor in the electric drive system; the copper busbar temperature sampling circuit 102 is used to collect the copper busbar temperature of the intelligent power module in the electric drive system; and the internal temperature sampling circuit 107 is used to collect the internal temperature of the intelligent power module.

[0179] In some embodiments, the temperature sampling circuit 10 includes a plurality of winding temperature sampling circuits 106, which are connected to the control module 120 and are used to collect the temperature of each phase winding of the motor respectively.

[0180] Specifically, each winding temperature sampling circuit 106 is responsible for collecting temperature information of a certain phase winding of the motor. Since the motor usually has multiple phases (such as a three-phase motor), multiple winding temperature sampling circuits 106 are needed to monitor the temperature of each phase respectively. The winding temperature sampling circuit 106 is connected to the control module 120. The control module 120 receives the temperature data from the winding temperature sampling circuit 106 and performs analysis and decision-making based on this data.

[0181] In some embodiments, the temperature sampling circuit 10 includes multiple copper busbar temperature sampling circuits 102, which are connected to the control module 120 and are used to collect the copper busbar temperature of each copper busbar of the intelligent power module.

[0182] Specifically, multiple copper busbar temperature sampling circuits 102 are dedicated to collecting the temperature of each copper busbar in the intelligent power module. The copper busbar is an important component for transmitting current during power conversion, and its temperature is a key indicator for evaluating the working status of the intelligent power module. The copper busbar temperature sampling circuits 102 are connected to the controller 120. The controller 120 receives the temperature data from the copper busbar temperature sampling circuits 102, and further processes and analyzes it to promptly detect potential overheating problems, thereby achieving accurate monitoring and protection of the temperature of each copper busbar in the intelligent power module.

[0183] In some embodiments, the temperature sampling circuit 10 includes a plurality of internal temperature sampling circuits 107, which are located within the intelligent power module and are used to collect temperature signals at different locations within the intelligent power module.

[0184] Specifically, since the internal structure and components of the intelligent power module are relatively complex, the temperature at different locations may vary significantly. Therefore, multiple internal temperature sampling circuits 107 are set at different locations within the intelligent power module to comprehensively cover and accurately collect temperature signals at different locations within the intelligent power module, thereby achieving comprehensive monitoring of the temperature at different locations within the intelligent power module.

[0185] In some embodiments, as shown in FIG9, the temperature sampling circuit 10 includes: a non-inverting amplifier circuit 13.

[0186] Specifically, the in-phase amplifier circuit 13 is connected to the temperature sensor and control module 120 used to detect the temperature of the target component, for amplification processing, and sends the amplified temperature signal to the control module 120.

[0187] In some embodiments, as shown in FIG9, the temperature sampling circuit further includes at least one of the following: a seventh filter circuit 12 and an eighth filter circuit 14.

[0188] Specifically, the seventh filter circuit 12 is adapted to be connected to the temperature sensor and the non-inverting amplifier circuit 13 to filter the temperature signal detected by the temperature sensor; the eighth filter circuit 14 is connected to the non-inverting amplifier circuit 13 and the control module 120 to filter the amplified temperature signal.

[0189] In some embodiments, as shown in FIG9, the temperature sampling circuit further includes at least one of the following: a pull-up power supply circuit 11 and a third clamping circuit 15.

[0190] Specifically, the pull-up power supply circuit 11 is adapted to be connected to the temperature sensor and the preset power supply; the seventh filter circuit 12 is adapted to be connected to the temperature sensor for filtering; the non-inverting amplifier circuit 13 is connected to the seventh filter circuit 12, the pull-up power supply circuit 11, and the temperature sensor for amplification; the eighth filter circuit 14 is connected to the non-inverting amplifier circuit 13 and the control module 120 for filtering; and the third clamping circuit 15 is connected to the eighth filter circuit 14 and the control module 120.

[0191] For example, the module temperature sampling circuit shown in Figure 9 includes a pull-up power supply circuit, a filter circuit, a non-inverting amplifier circuit, and a clamping circuit. Module temperature sampling 1 is pulled up to the VDD 5V power supply by resistor R32 (32nd resistor) and filtered by capacitor C21 (21st capacitor). Then, it passes through a non-inverting amplifier composed of resistor R33 (33rd resistor), resistor R34 (34th resistor), and operational amplifier IC8 (8th operational amplifier). After further RC filtering by resistor R35 (35th resistor), capacitor C22 (22nd capacitor), and clamping by clamping by clamping diode D8 (8th clamping diode), the output is sent to the control module's analog-to-digital converter for sampling. The Zener diode above clamping diode D8 provides voltage regulation.

[0192] The module temperature sample 2 is pulled up by resistor R36 to supply VDD (5V power) and filtered by capacitor C23. It then passes through a non-inverting amplifier composed of resistors R37 and R38, and operational amplifier IC9. After passing through an RC filter composed of resistor R39 and capacitor C24, and clamped by clamping diode D9, the output is sent to the control module's analog-to-digital converter for sampling. The Zener diode above clamping diode D9 provides voltage regulation.

[0193] The module temperature sample 3 is pulled up by resistor 40 to supply VDD (5V power) and filtered by capacitor C25. It then passes through a non-inverting amplifier composed of resistors R41 and R42, and operational amplifier IC10. After further filtering by an RC filter composed of resistor R43 and capacitor C26, and clamped by clamping diode D10, the output is sent to the control module's analog-to-digital converter for sampling. The Zener diode above the clamping diode D10 provides voltage regulation.

[0194] The copper busbar temperature sampling circuit shown in Figure 10 includes a pull-up power supply circuit, a filter circuit, a non-inverting amplifier circuit, and a clamping circuit.

[0195] The copper busbar temperature sample 1 is pulled up by resistor R44 to supply VDD (5V power) and filtered by capacitor C27. It then passes through a non-inverting amplifier composed of resistors R45 and R46, and operational amplifier IC11. After passing through an RC filter composed of resistor R47 and capacitor C28, and clamped by clamping diode D11, the output is sent to the analog-to-digital converter of the control module for sampling. The Zener diode above the clamping diode D11 provides voltage regulation.

[0196] The copper busbar temperature sample 2 is pulled up by resistor R48 to supply VDD 5V power and filtered by capacitor C29. It then passes through a non-inverting amplifier composed of resistor R49, resistor R50, and op-amp IC12. After passing through an RC filter composed of resistor R51, capacitor C30, and clamping by diode D12, the output is sent to the control module's analog-to-digital converter for sampling. The Zener diode above diode D12 provides voltage regulation.

[0197] The copper busbar temperature sample 3 is pulled up by resistor R52 to the VDD 5V power supply and filtered by capacitor C31. It then passes through a non-inverting amplifier composed of resistors R53 and R54, and operational amplifier IC13. After passing through an RC filter composed of resistor R55 and capacitor C32, and clamped by clamping diode D13, the output is sent to the analog-to-digital converter of the control module for sampling. The Zener diode above the clamping diode D13 provides voltage regulation.

[0198] The motor winding temperature sampling circuit shown in Figure 11 includes a pull-up power supply circuit, a filter circuit, a non-inverting proportional amplifier circuit, and a clamping circuit.

[0199] The motor winding temperature sample 1 is pulled up by resistor R56 to supply a 5V VDD power supply and filtered by capacitor C33. It then passes through a non-inverting amplifier composed of resistors R57 and R58, and operational amplifier IC14. After passing through an RC filter composed of resistor R59 and capacitor C34, and clamped by clamping diode D14, the output is sent to the control module's analog-to-digital converter for sampling. The Zener diode above the clamping diode D14 provides voltage regulation.

[0200] The motor winding temperature sample 2 is pulled up by resistor 60 to supply VDD 5V power and filtered by capacitor 35. It then passes through a non-inverting amplifier composed of resistors 61 and 62 and operational amplifier IC15. After further filtering by an RC filter composed of resistor 63 and capacitor C36, and clamped by clamping diode D15, the output is sent to the control module's analog-to-digital converter for sampling. The Zener diode above the clamping diode D15 provides voltage regulation.

[0201] Secondly, with reference to FIG12, a protection control method for an electric drive system according to some embodiments of the present application is described below. As shown in FIG12, the method includes at least steps S1 to S2.

[0202] Step S1: Acquire various sampling signals from the electric drive system.

[0203] Specifically, in this application, the sampling module acquires the sampling signals in the electric drive system, and thus can detect multiple sampling signals of the electric drive system. When the control module detects abnormalities in multiple sampling signals of the electric drive system, it indicates that the electric drive system may be malfunctioning.

[0204] Step S2: When at least two of the multiple sampling signals of the electric drive system are abnormal, protective measures for the electric drive system are implemented.

[0205] Specifically, the control module is connected to the sampling module and acquires various signals provided by the sampling module in real time. When at least two types of sampling signals show abnormalities, the control module will respond quickly and implement protection measures for the electric drive system. The protection measures can include disconnecting the control circuit breaker and cutting off the connection between the intelligent power module and the motor winding in the electric drive system. In abnormal situations, it can also effectively prevent the fault from escalating further, thereby protecting the safe and stable operation of the entire electric drive system.

[0206] According to some embodiments of the present application, the protection and control method for an electric drive system acquires multiple sampling signals in the electric drive system in real time and transmits the acquired signals to the control module. By considering multiple sampling signals, a comprehensive decision is made on whether to protect the electric drive system. When at least two types of sampling signals among the multiple sampling signals are abnormal, the controller executes protection measures for the electric drive system, thereby improving safety and reliability and avoiding misjudgment caused by sampling module abnormality or damage.

[0207] In some embodiments, the various sampling signals of the electric drive system include at least two of the following: bus voltage signal, motor winding current signal, temperature signal of the target component of the electric drive system, resolver signal corresponding to motor speed, and fault detection signal of intelligent power module.

[0208] Specifically, the bus voltage signal is used to monitor battery status and estimate remaining charge; voltage fluctuations exceeding the normal range may lead to system instability or damage. The motor winding current signal is used to assess motor load, detect overload or short circuit conditions, and achieve precise current control; excessive or insufficient current may indicate a motor fault or abnormal load. The temperature signal of the target components of the electric drive system is used to monitor the temperature of critical components inside the motor windings, preventing overheating and ensuring the safe operation of the motor and surrounding systems; temperatures exceeding a set threshold may damage the components. The resolver signal corresponding to the motor speed provides high-precision speed information; signal distortion or loss may lead to inaccurate speed control or motor runaway. The fault detection signal of the intelligent power module is used to detect the fault status of the intelligent power module; a fault signal trigger indicates that the module is faulty. When at least two of these signals are abnormal, corresponding protective measures should be taken to ensure the stability and safety of the system.

[0209] In some embodiments, the temperature signal of the target component of the electric drive system includes at least one type of temperature signal among the motor winding temperature, the copper plate temperature of the intelligent power module, and the internal temperature of the intelligent power module.

[0210] Specifically, in order to ensure the safe operation of the electric drive system, it is usually necessary to comprehensively monitor and protect the temperature signal, set temperature thresholds, and set reasonable temperature thresholds for the motor winding temperature, the copper plate temperature of the intelligent power module, and the internal temperature of the intelligent power module. When the temperature exceeds the threshold, the electric drive system is protected.

[0211] In some embodiments, implementing protection measures for the electric drive system includes sending a protection control signal to cut off the power supply to the circuit breaker between the intelligent power module connected to the electric drive system and the motor of the electric drive system, thereby disconnecting the intelligent power module from the motor.

[0212] Specifically, when the electric drive system detects an abnormality or fault, such as excessively high motor winding temperature or overheating of the intelligent power module, the system will immediately send a protection control signal, issued by the controller, to quickly disconnect the connection between the intelligent power module and the motor. To achieve this disconnection, a circuit breaker is installed between the intelligent power module and the motor. After receiving the protection control signal, the circuit breaker will quickly disconnect the power supply line between the intelligent power module and the motor to prevent potential damage from continued operation of the electric drive system under abnormal or fault conditions.

[0213] For example, as shown in Figure 2, the three-phase protection scheme of this application simultaneously samples the bus voltage, three-phase current, motor winding temperature, resolver signal, three-phase copper busbar temperature, and module temperature, and detects IPM faults. The control module then makes a comprehensive decision to control the drive power supply of the three-phase circuit breaker. The conditions for the control module to generate a protection signal can be either one signal abnormality and any other abnormal signal, or two signal abnormalities and any other abnormal signal (e.g., the control module detects an IPM fault and a three-phase current abnormality, and then detects a three-phase copper busbar temperature abnormality, generating a protection signal to control the power supply to the three-phase circuit breaker). The various samples and detected signals can be arbitrarily combined to generate protection. Because the protection action of this three-phase circuit breaker is to disconnect the three-phase copper busbar (replacing the three-phase circuit breaker is required to restore normal operation of the electric drive system), the impact of each abnormal signal on the IPM, motor, and battery needs to be considered when designing the protection signal strategy to avoid false triggering of protection. Furthermore, the definition of signal abnormality is not limited to signal too high or too low.

[0214] Special note: The three-phase circuit breaker is connected in series with the three-phase copper busbar at the output of the IPM module. It integrates a three-phase copper busbar temperature sensor, a three-phase Hall sensor, and a circuit breaker. When the three-phase circuit breaker is powered on to drive its operation, the three-phase copper busbar will be disconnected to disconnect the motor from the IPM for protection.

[0215] This solution employs multi-signal integrated processing, taking into account the characteristics of each module in the electric drive system (temperature, current, speed, etc.) to comprehensively determine whether to perform three-phase protection. Compared to existing technologies that only collect voltage signals for judgment, this is safer and more reliable, effectively reducing false judgments caused by abnormal or damaged sensor sampling in the system. Compared to existing technologies, this solution provides specific protection measures after generating a protection signal. When the control module generates a protection signal, it sends a signal to the three-phase circuit breaker power control circuit, controlling the power output to the three-phase circuit breaker to disconnect the three-phase copper busbars. As shown in Figure 13, all signal processing in this solution is within the control module; only the signal sampling input needs to be sent to the control module, eliminating the need for additional external signal processing circuits.

[0216] Thirdly, some embodiments of this application provide an electric drive system, as shown in FIG14, the electric drive system 800 including: protection circuit 100.

[0217] According to some embodiments of the present application, the electric drive system has a protection circuit that acquires various types of sampling signals in the electric drive system in real time and transmits the acquired signals to the control module. By considering various types of sampling signals, the controller comprehensively decides whether to protect the electric drive system. When at least two types of sampling signals are abnormal, the controller performs protection measures for the electric drive system, thereby improving safety and reliability and avoiding misjudgment when the sampling module is abnormal or damaged.

[0218] In some embodiments, as shown in FIG14, the electric drive system 800 further includes a drive module 801, an intelligent power module 802, and a motor 803.

[0219] The drive module 801 is connected to the intelligent power module 802, and the drive module 801 is also connected to the control module 120 in the protection circuit. The motor 803 is connected to the intelligent power module 802 through the circuit breaker 130 in the protection circuit.

[0220] Fourthly, some embodiments of this application provide a vehicle, as shown in FIG15, the vehicle 900 including: an electric drive system 800.

[0221] According to some embodiments of the present application, the protection circuit acquires various types of sampling signals from the electric drive system in real time and transmits the acquired signals to the control module. By considering various types of sampling signals, the controller comprehensively decides whether to protect the electric drive system. When at least two types of sampling signals are abnormal, the controller executes protection measures for the electric drive system, thereby improving safety and reliability and avoiding misjudgment caused by sampling module abnormality or damage.

[0222] The motor controller is a core component of new energy vehicles. For powertrains or industrial inverters using permanent magnet synchronous motors in new energy vehicles, if the motor controller experiences a serious fault, such as over-temperature, over-current, or over-voltage, during high-speed motor operation, it will execute a shutdown operation. At this time, if the permanent magnet is rotating at high speed, a high back electromotive force will be generated on the three-phase windings of the motor. If all the switching transistors of the three-phase bridge inverter are directly shut down, the excessively high back electromotive force will backflow into the bus capacitor and battery pack through the freewheeling diodes of the power switching transistors, resulting in uncontrollable rectification. This can lead to DC bus overvoltage and generate a large regenerative braking torque. The large regenerative braking torque may cause battery overcharging and damage or increase the risk of rollover.

[0223] To address the above situation, an active short circuit (ASC) solution is typically used. This involves short-circuiting the motor stator windings by turning on all three switching transistors in the upper or lower arm of the inverter, thereby enabling the vehicle to enter a relatively safe state in the event of a collision or other malfunctions.

[0224] The aforementioned ASC scheme is based on the premise that the three-phase inverter is controllable. During operation, if the motor controller loses control of the three-phase inverter (i.e., a power transistor failure or a power transistor drive circuit failure), the power transistor drive chip will report an Intelligent Power Module (IPM) failure to the motor controller and shut down the drive output. The motor controller will then be unable to control the inverter's operation, and an active short circuit cannot be initiated. In the vehicle, IPM refers to the integration of the power module and the drive circuit board. "Intelligent" refers to the drive section, used to control the switching of the power module's transistors (such as IGBTs and SiC MOSFETs); the power module's function is to convert the DC power output from the battery pack into three-phase AC power to drive the permanent magnet synchronous motor.

[0225] If a three-phase inverter power transistor fails, because it's uncertain which phase of the module is short-circuited or open-circuited, prematurely activating three-phase short-circuit protection when one phase of the three-phase inverter is short-circuited could cause a direct connection between the upper and lower bridge arms of the three-phase inverter, short-circuiting the battery pack and posing a risk of rapid energy accumulation and potential fire. Even if it's possible to detect which bridge arm's power transistor is short-circuited, three-phase short-circuit protection cannot provide protection by opening the upper or lower bridge if two phases of the three-phase inverter's upper and lower bridge power devices are short-circuited. This is because it will inevitably lead to a direct connection between the upper and lower bridge arms of the three-phase inverter, short-circuiting the battery pack and posing a risk of rapid energy accumulation and potential fire.

[0226] To address the aforementioned problems, in a fifth aspect, some embodiments of this application provide a motor control circuit. Figure 16 is a schematic diagram of the structure of a motor control circuit provided in some embodiments of this application. Referring to Figure 16, the motor control circuit 1000 provided in some embodiments of this application includes a detection circuit 1100 and a protection circuit 1200. The detection circuit 1100 is used to detect the detection parameter generated by the back electromotive force generated by the motor 200; the protection circuit 1200 is used to disconnect the motor 200 from the motor drive circuit 300.

[0227] When the detected parameter meets the first condition, the protection circuit 1200 disconnects the connection between the motor 200 and the motor drive circuit 300.

[0228] When the detected parameter does not meet the first condition, the protection circuit 1200 remains unchanged, which can be understood as maintaining the connection between the motor 200 and the motor drive circuit 300, or maintaining the conduction of the motor 200 and the motor drive circuit 300.

[0229] By disconnecting the motor from the motor drive circuit when the detection parameters meet the first condition, the problem of excessive back EMF causing reverse current flow to the bus capacitor and battery pack through the freewheeling diode of the switching transistor can be at least partially solved when the ASC scheme cannot be directly executed. This effectively avoids current reverse current flow caused by the inverter itself having a fault.

[0230] Figure 17 is a schematic diagram of another motor control circuit provided in some embodiments of this application. Referring to Figure 17, the motor drive circuit 300 may include an inverter 310, a bus capacitor C1, a battery pack 320, and a cable 330 for connecting the inverter 310 and the motor 200.

[0231] Inverter 310 can be a single-phase inverter or a multi-phase inverter. In some embodiments of this application, a three-phase inverter is used as an example for illustrative purposes. Correspondingly, in some embodiments of this application, motor 200 can be a three-phase wound motor. Inverter 310 and motor 200 can be connected via three-phase cables, which correspond to the U, V, and W phases of motor 200, respectively. Inverter 310 can include six bridge arms (corresponding to three upper bridge arms and three lower bridge arms) across the U, V, and W phases. Each phase includes one upper bridge and one lower bridge, and the bridge arms are implemented using switching transistors (Q1 to Q6).

[0232] By controlling the on / off state of the six switching transistors in the inverter 310, the battery pack 320 can charge the bus capacitor C1, thereby charging the motor 200 in the forward direction, and the motor 200 can charge the battery pack 320 in the reverse direction. The above charging process can be implemented using conventional techniques in the art, and will not be specifically described in the embodiments of this application.

[0233] In some embodiments, the detected parameters may include at least one of current and temperature. For example, it may be the phase current of each phase cable connected to the inverter 310, i.e., the current flowing through each phase cable between the inverter 310 and the motor 200; it may be the temperature of each switching transistor in the inverter 310; it may be the temperature of each phase cable between the inverter 310 and the motor 200; or it may be the temperature of each phase winding of the motor 200.

[0234] Referring to FIG18, in some embodiments, the motor control circuit 1000 further includes a controller 1300 connected to the detection circuit 1100 and the protection circuit 1200. The controller 1300 is used to control the protection circuit 1200 to disconnect, or to control the protection circuit 1200 to connect or remain in its original state, based on the detection parameters. The detection circuit 1100 sends the collected detection parameters to the controller 1300. After processing the detection parameters, the controller 1300 determines whether the protection circuit 1200 needs to be disconnected. If disconnection is required, a corresponding disconnection control command is sent to the protection circuit 1200; if disconnection is not required, a corresponding connection control command can be sent to the protection circuit 1200, or no command can be sent, leaving the protection circuit 1200 in its original state.

[0235] The controller 1300 can be integrated into the micro-controller unit (MCU) of the original motor drive circuit, or it can exist independently of the motor drive circuit in the motor control circuit. This application embodiment does not limit this.

[0236] In some embodiments, the protection circuit 1200 includes at least one switch, with one switch installed on each phase of the cable between the inverter 310 and the motor 200. Specifically, the protection circuit 1200 may include at least one fuse, with one fuse installed on each phase of the cable between the inverter 310 and the motor 200. The fuse is connected to a first power source. When the first power source receives a command from the controller 1300, it sends a fusing current to the fuse, typically a current greater than or equal to 2A. Upon receiving the fusing current, the fuse melts the corresponding cable through self-heating, thereby disconnecting the connection between the motor 200 and the inverter 310. In some embodiments of this application, the cables can be made of conductive materials such as copper busbars or aluminum alloys, and the first power source can be any vehicle-mounted power source.

[0237] In some embodiments, the controller 1300 may include a detection module 1301 for detecting whether there is a fault in the inverter and / or the inverter's drive circuit. The detection module 1301 can be understood as an IPM fault detection module, used to report an IPM fault when the inverter's switching transistors and / or the inverter's drive circuit malfunction. The detection module 1301 can be integrated inside the controller 1300 or disposed on the IPM's drive circuit board. As mentioned above, IPM refers to the integration of a power module and a drive circuit board. The drive circuit board contains the inverter's drive chip, which can integrate detection functions to detect IPM faults and then report them to the controller.

[0238] In some embodiments, the detection circuit 1100 is further configured to: detect a detection parameter generated by the back electromotive force generated by the motor in response to a fault in the inverter and / or a fault in the inverter's drive circuit (i.e., an IPM fault). To avoid false alarms due to an IPM fault, the detection circuit 1100 further detects the detection parameter generated by the back electromotive force generated by the motor, which is equivalent to a secondary protection. When the detection parameter meets the first condition, the controller 1300 controls the protection circuit 1200 to disconnect the cable 340, that is, to disconnect the connection between the motor 200 and the motor drive circuit 300.

[0239] In some embodiments, the detection circuit 1100 may include a current sensor for detecting the phase current of each phase cable 340 in the multiphase cable connected to the inverter 310. In some embodiments of this application, the current sensor may be implemented using a Hall effect sensor or other current-detecting sensors. When the switching transistor of the inverter 310 fails or its drive circuit fails, the controller 1300 will report an IPM fault. At this time, the detection circuit 1100 detects the phase current of each phase cable 340. When the absolute value of the integral value of the phase current of a certain phase of the inverter is detected to be greater than a first threshold, it can be determined that there is a short circuit between the inverter, the three-phase lines (equivalent to cables), or the permanent magnet synchronous motor windings. The current will suddenly surge, causing the inverter 310 to overheat and be damaged, with a risk of rapid energy accumulation leading to a fire.

[0240] The integral value of the phase current is affected by two factors of the vehicle: the battery pack voltage and the short-circuit resistance of the power module's half-bridge. These variables are specific to the vehicle model. Using a 300V battery pack with a 0.1Ω internal resistance, the corresponding strategy is: when an IPM fault occurs, the motor speed is ≤6000 r / min, and the phase current of one phase is >10A, circuit breaker protection is triggered; when an IPM fault occurs, the motor speed is >6000 r / min, and the integral value of the three-phase current is >45, circuit breaker protection is triggered. Circuit breaker protection requires disconnecting at least two phases of the three-phase cable.

[0241] In some embodiments, the detection circuit 1100 may further include a first temperature sensor for detecting the temperature of each arm in the inverter 310. When the vehicle is running at high speed, if an IPM fault occurs, the motor controller will forcibly shut down the six drive signals driving the inverter 310. When one phase arm is short-circuited, the first temperature sensor can detect that the temperature of that phase arm is higher than the other two phases, while the temperatures of the two non-short-circuited phases are approximately equal. If the temperature difference between one phase and the other two phases is found to be greater than a first temperature difference threshold, it can be considered that the phase with the excessive temperature has a short-circuit fault. It should be understood that a phase arm includes two arms connected to the same phase cable. For example, if the temperature difference T1 between the two arms connected to the U-phase cable and the temperature T2 between the two arms connected to the V-phase cable is greater than the first temperature difference threshold and T1 is greater than T2, it can be determined that at least one arm connected to the U-phase cable has a fault; if the temperature difference T1 between the two arms connected to the U-phase cable and the temperature T3 between the two arms connected to the W-phase cable is greater than the first temperature difference threshold and T1 is greater than T3, it can be determined that at least one arm connected to the U-phase cable has a fault. When the temperature difference T1 between the two bridge arms connected to the U-phase cable and the temperature T2 between the two bridge arms connected to the V-phase cable is greater than the first temperature difference threshold and T1 is greater than T2, and at the same time the temperature difference T3 between the two bridge arms connected to the W-phase cable and the temperature T1 between the two bridge arms connected to the U-phase cable is greater than the first temperature difference threshold and T3 is greater than T1, it can be determined that at least one bridge arm connected to the W-phase cable and at least one bridge arm connected to the U-phase cable have both failed.

[0242] When the temperature of two of the three bridge arms in the upper bridge is significantly higher than that of the third bridge arm, it can be determined that the two bridge arms with higher temperatures have a short-circuit fault; similarly, when the temperature of two of the three bridge arms in the lower bridge is significantly higher than that of the third bridge arm, it can be determined that the two bridge arms with higher temperatures have a short-circuit fault. When the temperature of all three bridge arms in the upper bridge is significantly higher than that of the first bridge arm, it can be determined that all three bridge arms have a short-circuit fault; similarly, when the temperature of all three bridge arms in the lower bridge is significantly higher than that of the first bridge arm, it can be determined that all three bridge arms have a short-circuit fault. Therefore, the decision to disconnect the protection circuit 1200 can be made by judging whether the IPM fault and the temperature difference between the three-phase inverter bridge arms exceed the set first temperature difference threshold, or whether the temperature of any individual bridge arm exceeds the set first bridge arm temperature.

[0243] In some embodiments, the detection circuit 1100 may further include a second temperature sensor for detecting the temperature of each phase cable 330 between the inverter 310 and the motor 200. During high-speed vehicle operation, if an IPM fault occurs, the motor controller will forcibly shut down the six drive signals driving the inverter 310. If the temperature difference between one phase cable and the other two phase cables is found to be greater than a second temperature difference threshold, the phase with the excessively high temperature is considered to have a short circuit fault. When the temperature of two phase cables is found to be significantly higher than that of another phase cable, and the cable temperature difference is greater than the second temperature difference threshold or other set thresholds, a two-phase short circuit fault can be determined. When the temperature of all three phase cables is found to be significantly higher than the temperature of the first cable or other set temperatures, a three-phase short circuit fault can be determined. Regardless of whether it is a one-phase short circuit, a two-phase short circuit, or a three-phase short circuit, at least two phase cables need to be disconnected via the protection circuit 1200.

[0244] Referring to Figure 19, in some embodiments, the detection circuit may further include a third temperature sensor 1101 for detecting the temperature of each winding in the motor 200. When the vehicle is running at high speed, if an IPM fault occurs, the motor controller will forcibly shut down the six drive signals driving the inverter. If the temperature difference between one phase winding and the other two phase windings of the motor 200 is found to be greater than a third temperature difference threshold, a short circuit fault can be considered to have occurred on the phase winding with the excessively high temperature. When the temperature of two phase windings is found to be much higher than that of another phase winding, and the temperature difference between the windings is greater than the third temperature difference threshold or other set thresholds, a two-phase short circuit fault can be determined. When the temperature of three phase windings is found to be much higher than the temperature of the first winding or other set temperatures, a three-phase short circuit fault can be determined. Regardless of whether it is a one-phase short circuit, a two-phase short circuit, or a three-phase short circuit, at least two phase cables need to be disconnected via the protection circuit 1200.

[0245] In some embodiments, the motor 200 can be implemented by a permanent magnet synchronous motor. The rotor of the permanent magnet synchronous motor is a permanent magnet, and the winding coils are on the stator. When the motor rotor rotates, the magnetic field generated by the rotor permanent magnet rotates and is cut by the stator coils, generating a back electromotive force on the coils.

[0246] It should be noted that the relationship between the back electromotive force and the electric angular velocity of a permanent magnet synchronous motor is shown in Formula 1 below. The higher the speed of the permanent magnet synchronous motor, the greater its back electromotive force.

[0247] Formula 1:

[0248] Where E represents the back electromotive force of the permanent magnet synchronous motor, ω e This represents the electrical angular velocity of a permanent magnet synchronous motor. This represents the back electromotive force constant of the motor rotor.

[0249] Sixthly, some embodiments of this application also provide a motor control method, applied to the motor control circuit of any of the embodiments of the fifth aspect above. All functions achievable by the aforementioned motor control circuit can be implemented by this method, and the previously described content will not be repeated here. Figure 20 is a flowchart of a motor control method provided in some embodiments of this application. Referring to Figure 20, the motor control method includes:

[0250] Step S501: Based on the detection parameters generated by the back electromotive force generated by the motor, the control protection circuit disconnects the connection between the motor and the motor drive circuit.

[0251] By disconnecting the motor from the motor drive circuit when the detection parameters meet the first condition, and maintaining the connection between the motor and the motor drive circuit when the detection parameters do not meet the first condition, the problem of excessive back electromotive force causing reverse current flow to the bus capacitor and battery pack through the freewheeling diode of the switching transistor is at least partially solved when the ASC scheme cannot be directly executed. This effectively avoids current reverse flow caused by the inverter itself having a fault.

[0252] In some embodiments, the method further includes: in response to a fault in the inverter in the motor drive circuit and / or a fault in the inverter drive circuit, detecting a detection parameter generated by the back electromotive force generated by the motor.

[0253] In some embodiments, the detected parameters include at least one of current and temperature. For example, it could be the phase current of each phase cable between the inverter 310 and the motor 200, the temperature of each bridge arm (i.e., switch) in the inverter 310, the temperature of each phase cable between the inverter 310 and the motor 200, or the temperature of each phase winding in the motor 200.

[0254] In some embodiments, step S501 can be implemented by the following steps: when the detection parameter meets the first condition, the protection circuit disconnects the connection between the motor and the motor drive circuit.

[0255] In some embodiments, referring to FIG21, step S501 can be implemented by the following steps: when the absolute value of the phase current integral value of any phase cable connected to the inverter is greater than a first threshold, at least two phases of the multiphase cable between the inverter and the motor are disconnected. Specifically, the following exemplary description is given using a permanent magnet synchronous motor and a three-phase inverter as examples.

[0256] S1. When the permanent magnet synchronous motor controller and the three-phase inverter are powered on, the permanent magnet synchronous motor controller will control the switching transistors of the three-phase inverter to switch on and off in an orderly manner to drive the permanent magnet synchronous motor to run.

[0257] S2, at this time the permanent magnet synchronous motor controller monitors the status of the three-phase inverter in real time through the three-phase inverter fault detection device and the three-phase current detection device.

[0258] S3. When the permanent magnet synchronous motor controller detects that the three-phase inverter has no IPM fault or that the phase current integral values ​​are all near 0, the permanent magnet synchronous motor controller normally controls the power switching transistors of the three-phase inverter to drive the permanent magnet synchronous motor, and the motor controller continues to monitor the status information. When the switching transistors of the three-phase inverter fail or the drive circuit of the switching transistors fails, the permanent magnet synchronous motor controller will report an IPM fault and forcibly shut down the six drive signals driving the three-phase inverter, keeping the six bridge arms of the three-phase inverter open. At this time, the high-speed rotating permanent magnet synchronous motor will generate a large back electromotive force. When the back electromotive force is greater than the battery pack voltage, a phase current will be generated, which will back-feed through the freewheeling diodes of the power switching transistors to the bus capacitor and the battery pack, resulting in uncontrolled rectification.

[0259] If condition 2 is not met at this time, it proves that the three-phase inverter is not damaged and driving safety can be ensured by existing three-phase active short circuit protection strategies (e.g., ASC scheme).

[0260] When the absolute value of the phase current integral of a certain phase cable connected to the inverter is detected to be greater than the first threshold, it can be determined that there is a short circuit between the inverter, the three-phase line or the permanent magnet synchronous motor winding. The current will suddenly surge, causing the three-phase inverter to overheat and be damaged. There is a risk of rapid energy accumulation leading to fire.

[0261] S4, determine the fault condition and whether both condition 1 (IPM fault) and condition 2 (absolute value of phase current integral is too large) are met simultaneously.

[0262] S5: If both IPM fault and excessive phase current integral value occur, the protection circuit will be immediately disconnected.

[0263] By promptly disconnecting two or three phases of the three-phase lines of the permanent magnet synchronous motor through the three-phase circuit breaker (equivalent to the aforementioned protection circuit), the connection between the permanent magnet synchronous motor and the three-phase inverter can be severed. Since the three-phase lines of the permanent magnet synchronous motor do not form a current-carrying loop and no current is generated, it will not cause damage to the three-phase inverter and battery pack.

[0264] For three-phase current detection methods, in addition to Hall effect sensors, corresponding current detection chips can be used, or current sensors can be integrated into the switching transistors of the inverter, etc. Any method that controls a three-phase circuit breaker by judging the integral value of the three-phase current is within the scope of protection of this application.

[0265] Referring to Figure 22, in some embodiments, step S501 can also be implemented by the following step: when the temperature difference between two bridge arms of the inverter is greater than a first temperature difference threshold, at least two phases of the multiphase cable between the inverter and the motor are disconnected. Specifically, the following exemplary description is given using a permanent magnet synchronous motor and a three-phase inverter as examples.

[0266] S1. When the permanent magnet synchronous motor controller and the three-phase inverter are powered on, the permanent magnet synchronous motor controller will control the switching transistors of the three-phase inverter to switch on and off in an orderly manner to drive the permanent magnet synchronous motor to run.

[0267] S2, at this time the permanent magnet synchronous motor controller monitors the status of the three-phase inverter in real time through the three-phase inverter fault detection device and the three-phase current detection device.

[0268] S3, if an IPM fault occurs during high-speed vehicle operation, the motor controller will forcibly shut down the six drive signals of the drive inverter 310. When one phase arm is short-circuited, the first temperature sensor can detect that the temperature of that phase arm is higher than that of the other two phases, while the temperatures of the two non-short-circuited phases are approximately equal. If the temperature difference between one phase and the other two phases is found to be greater than the first temperature difference threshold, it can be considered that the phase with the excessive temperature has a short-circuit fault. When the temperatures of two arms are found to be much higher than that of another arm, and the temperature difference between the arms is greater than the first temperature difference threshold or other set thresholds, it can be determined that these two arms of the three-phase inverter have short-circuit faults. When the temperatures of all three arms are found to be much higher than the temperature of the first arm or other set temperatures, it can be determined that all three arms of the three-phase inverter have short-circuit faults.

[0269] S4, determine the fault condition and whether both condition 1 (IPM fault) and condition 2 (excessive temperature difference of inverter bridge arm) are met simultaneously.

[0270] S5: If both IPM fault and excessive phase current integral value occur, the protection circuit will be immediately disconnected.

[0271] Referring to Figure 23, in some embodiments, step S501 can also be implemented by the following step: when the temperature difference between two phases of the multiphase cable between the inverter and the motor is greater than a second temperature difference threshold, at least two phases of the multiphase cable are disconnected. Specifically, the following exemplary description is given using a permanent magnet synchronous motor and a three-phase inverter as examples.

[0272] S1. When the permanent magnet synchronous motor controller and the three-phase inverter are powered on, the permanent magnet synchronous motor controller will control the switching transistors of the three-phase inverter to switch on and off in an orderly manner to drive the permanent magnet synchronous motor to run.

[0273] S2, at this time the permanent magnet synchronous motor controller monitors the status of the three-phase inverter in real time through the three-phase inverter fault detection device and the three-phase current detection device.

[0274] S3: When the vehicle is running at high speed, if an IPM fault occurs, the motor controller will forcibly shut down the six drive signals of the drive inverter 310. If the temperature difference between one phase cable and the other two phase cables is found to be greater than the second temperature difference threshold, it can be considered that the phase with the excessive temperature has a short circuit fault. When the temperature of two phase cables is found to be much higher than that of another phase cable, and the cable temperature difference is greater than the second temperature difference threshold or other set thresholds, it can be determined that a two-phase short circuit fault has occurred. When the temperature of all three phase cables is found to be much higher than the set first cable temperature, it can be determined that a three-phase short circuit fault has occurred.

[0275] S4, determine the fault condition and whether both condition 1 (IPM fault) and condition 2 (excessive cable temperature rise) are met simultaneously.

[0276] S5: If both IPM fault and excessive phase current integral value occur, the protection circuit will be immediately disconnected.

[0277] Referring to Figure 24, in some embodiments, step S501 can also be implemented by the following step: when the temperature difference between two phase windings in the multiphase winding of the motor is greater than a third temperature difference threshold, at least two phases in the multiphase cable are controlled to disconnect. Specifically, the following exemplary description is given using a permanent magnet synchronous motor and a three-phase inverter as examples.

[0278] S1. When the permanent magnet synchronous motor controller and the three-phase inverter are powered on, the permanent magnet synchronous motor controller will control the switching transistors of the three-phase inverter to switch on and off in an orderly manner to drive the permanent magnet synchronous motor to run.

[0279] S2, at this time the permanent magnet synchronous motor controller monitors the status of the three-phase inverter in real time through the three-phase inverter fault detection device and the three-phase current detection device.

[0280] S3: If an IPM fault occurs during high-speed vehicle operation, the motor controller will forcibly shut down the six drive signals of the inverter. If the temperature difference between one phase winding and the other two phase windings of motor 200 is found to be greater than the fourth threshold (preset temperature difference threshold), a short circuit fault can be considered to have occurred on the phase with the excessive temperature. When the temperature of two phase windings is found to be much higher than that of another phase winding, and the temperature difference between the windings is greater than the third temperature difference threshold or other set thresholds, a two-phase short circuit fault can be determined. When the temperature of all three phase windings is found to be much higher than the temperature of the first winding or other set temperatures, a three-phase short circuit fault can be determined.

[0281] S4, determine the fault condition and whether both condition 1 (IPM fault) and condition 2 (excessive temperature difference in motor windings) are met simultaneously.

[0282] S5: If both IPM fault and excessive phase current integral value occur, the protection circuit will be immediately disconnected.

[0283] The motor control circuit and method provided in some embodiments of this application can, while detecting IPM fault signals, comprehensively determine when to disconnect the protection circuit by judging the absolute value of the integral value of the phase current over a period of time (one cycle or multiple cycles). This allows for timely disconnection of the motor and inverter when an inverter fault occurs (whether short circuit or open circuit), a drive circuit fault occurs, or a short circuit occurs in the internal windings of the motor or the external three-phase cables, thus avoiding damage caused by excessive back electromotive force of the motor.

[0284] In a seventh aspect, some embodiments of this application also provide a computer-readable storage medium storing instructions that, when executed by a processor, configure the processor to perform the motor control method of the sixth aspect described above. For example, the following steps can be performed:

[0285] S1 controls the protection circuit to maintain or disconnect the connection between the motor and the motor drive circuit based on the detection parameters generated by the back electromotive force generated by the motor.

[0286] Eighthly, referring to FIG25, some embodiments of this application also provide a motor protection module 1001, including the motor control circuit 1000 of any embodiment of the fifth aspect above.

[0287] Ninthly, referring to FIG26, some embodiments of this application also provide a vehicle 2000, including the motor protection module 1001 described above, or the motor control circuit 1000 in any embodiment of the fifth aspect described above. In some embodiments of this application, the vehicle may be a gasoline vehicle, a plug-in hybrid electric vehicle, or a new energy vehicle, etc., and this disclosure does not specifically limit it in this way.

[0288] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0289] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more flowchart illustrations and / or one or more block diagrams.

[0290] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means that implement the functions specified in one or more flowcharts and / or one or more block diagrams.

[0291] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowcharts and / or one or more block diagrams.

[0292] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0293] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0294] Computer-readable media include both permanent and non-permanent, removable and non-removable media, which can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient media, such as modulated communication signals and carrier waves.

[0295] The above are merely some embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the content of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A protection circuit, wherein, include: The sampling module is used to obtain various sampling signals from the electric drive system. A control module, connected to the sampling module, is used to perform protective measures for the electric drive system when at least two of the sampling signals of the electric drive system are abnormal.

2. The protection circuit of claim 1, wherein, The protection circuit includes: A circuit breaker, connected to the control module, adapted to connect between the intelligent power module of the electric drive system and the motor windings of the electric drive system, the circuit breaker being used to disconnect in response to a power failure signal to protect the electric drive system.

3. The protection circuit according to claim 2, wherein, The protection circuit also includes a power supply, which is connected to the power supply terminal of the circuit breaker to supply power to the circuit breaker. The control module is connected to the power supply and the circuit breaker, and is used to cut off the power supply from the power supply to the circuit breaker when at least two of the sampling signals are abnormal, so as to disconnect the circuit breaker.

4. The protection circuit of claim 3, wherein, The control module includes: A main control unit, connected to the sampling module, is used to issue a protection control signal when at least two of the sampling signals of the electric drive system are abnormal; A power control unit is connected to the main control unit, the power supply, and the circuit breaker. The power control unit is used to cut off the power supply from the power supply to the circuit breaker in response to the protection control signal.

5. The protection circuit of claim 4, wherein, The power control unit includes: A power control trigger subunit is provided, wherein a first end of the power control trigger subunit is connected to the main control unit, a second end of the power control trigger subunit is connected to the power supply, and a third end of the power control trigger subunit is connected to a preset power supply. The power control trigger subunit is used to issue a power disconnect trigger signal in response to the protection control signal.

6. The protection circuit of claim 5, wherein, The power control unit also includes: A power connection control subunit is provided, wherein a first terminal of the power connection control subunit is connected to a fourth terminal of the power control trigger subunit, a second terminal of the power connection control subunit is connected to the power supply, and a third terminal of the power connection control subunit is connected to the circuit breaker, for use in response to the power disconnection trigger signal to cut off the power supply from the power supply to the circuit breaker.

7. The protection circuit of claim 6, wherein, The power control trigger subunit includes: A first resistor, the first end of which is connected to the preset power supply, and the second end of which is connected to the main control unit; The second resistor has its first end connected to the second end of the first resistor and the main control unit. The third resistor has its first end connected to the main control unit, the second end of the first resistor, and the first end of the second resistor, and its second end is grounded. The first switch transistor has its control terminal connected to the second terminal of the second resistor, its first terminal connected to the power supply connection control subunit, its second terminal connected to the second terminal of the third resistor, and its second terminal grounded.

8. The protection circuit of claim 7, wherein, The power connection control subunit includes: The fourth resistor has its first end connected to the power supply of the circuit breaker, and its second end connected to the first end of the first switching transistor. The second switch has its control terminal connected to the first terminal of the first switch and the second terminal of the fourth resistor. The first terminal of the second switch is connected to the power supply of the circuit breaker and the first terminal of the fourth resistor. The second terminal of the second switch is connected to the circuit breaker.

9. The protection circuit according to claim 8, wherein, When the main control unit does not issue the protection control signal, the main control unit outputs a low-level signal to the power supply control unit. The preset power supply is grounded through the first resistor. The control terminal of the first switch is at a low level, and the first switch is not conducting. The power supply of the circuit breaker is blocked by the first switch through the fourth resistor. The control terminal of the second switch is at a high level, and the second switch is not conducting. The circuit breaker is in a closed state.

10. The protection circuit according to claim 8, wherein, When the main control unit issues the protection control signal, the main control unit outputs a high-level signal to the power control unit. The preset power supply is supplied to the control terminal of the first switch tube through the first resistor and the second resistor. The control terminal of the first switch tube is at a high level, and the first switch tube is turned on. The power supply of the circuit breaker is grounded through the fourth resistor and the first switch tube. The control terminal of the second switch tube is at a low level, and the second switch tube is turned on. The circuit breaker is disconnected to cut off the connection between the intelligent power module and the motor winding of the electric drive system.

11. The protection circuit according to any one of claims 2-10, wherein, The circuit breaker includes: A circuit breaker, adapted to be connected between the intelligent power module of the electric drive system and the motor winding of the electric drive system, for disconnecting in response to the power failure signal.

12. The protection circuit of claim 11, wherein, The sampling module is at least one of a speed sampling circuit and a copper busbar temperature sampling circuit. The speed sampling circuit is used to collect the resolver signal corresponding to the motor speed, and the copper busbar temperature sampling circuit is used to collect the copper busbar temperature of the intelligent power module of the electric drive system.

13. The protection circuit of claim 12, wherein, The rotational speed sampling circuit and / or the copper busbar temperature sampling circuit are integrated into the circuit breaker.

14. The protection circuit according to any one of claims 1-10, wherein, The sampling modules include at least two of the following types: A bus voltage sampling circuit, connected to the control module, is used to collect the bus voltage signal of the electric drive system; A current sampling circuit, connected to the control module, is used to collect the winding current signal of the motor in the electric drive system. A temperature sampling circuit, connected to the control module, is used to collect temperature signals of the target components of the electric drive system; A speed sampling circuit, connected to the control module, is used to acquire the resolver signal corresponding to the motor speed; A smart power module fault detection circuit, connected to the control module, is used to obtain fault detection signals from the smart power module.

15. The protection circuit of claim 14, wherein, The bus voltage sampling circuit includes: A first differential operation circuit, wherein a first terminal of the first differential operation circuit is adapted to be connected to the positive and negative terminals of the bus of the electric drive system, and a second terminal of the first differential operation circuit is connected to the control module for generating a bus voltage signal.

16. The protection circuit of claim 15, wherein, The bus voltage sampling circuit further includes at least one of the following: A first filtering circuit is adapted to be connected to the positive terminal of the bus, the negative terminal of the bus, and the first differential operation circuit to filter the input bus signal. The second filtering circuit is connected to the first differential operation circuit and the control module, and is used to filter the bus voltage signal. A first clamping circuit is connected to at least the control module.

17. The protection circuit according to claim 14, wherein, The current sampling circuit includes: A voltage divider circuit, which is adapted to be connected to a motor winding to obtain a voltage divider signal; A voltage follower, connected to the control module, is used to amplify the voltage divider signal and send the amplified voltage divider signal to the control module to obtain the winding current signal.

18. The protection circuit of claim 17, wherein, The current sampling circuit also includes: A third filtering circuit, which is connected to the voltage divider circuit and the voltage follower, is used to filter the voltage divider signal; A fourth filtering circuit is connected to the voltage follower and the control module to filter the amplified voltage divider signal.

19. The protection circuit of claim 18, wherein, The current sampling circuit also includes: The second clamping circuit is connected to the fourth filter circuit and the control module.

20. The protection circuit of claim 14, wherein, The rotational speed sampling circuit is a resolver decoding chip, which is connected to the control module to obtain the resolver signal.

21. The protection circuit of claim 14, wherein, The intelligent power module fault detection circuit includes: The bridge fault detection circuit is adapted to be connected to the bridge circuit of the intelligent power module and is used to detect faults in the bridge circuit to obtain bridge fault detection information.

22. The protection circuit according to claim 21, wherein, The intelligent power module fault detection circuit further includes a fifth filter circuit, which is connected to the upper bridge fault detection circuit and the control module, and is used to filter the upper bridge fault detection information.

23. The protection circuit of claim 21, wherein, The intelligent power module fault detection circuit also includes: The lower bridge fault detection circuit is adapted to be connected to the lower bridge circuit of the intelligent power module and is used to detect faults in the lower bridge circuit to obtain lower bridge fault detection information.

24. The protection circuit according to claim 23, wherein, The intelligent power module fault detection circuit further includes a sixth filter circuit, which is connected to the lower bridge fault detection circuit and the control module, and is used to filter the lower bridge fault detection information.

25. The protection circuit of claim 14, wherein, The temperature sampling circuit includes at least one of the following types: A winding temperature sampling circuit is used to collect the winding temperature of the motor in the electric drive system. A copper busbar temperature sampling circuit is used to collect the copper busbar temperature of the intelligent power module of the electric drive system; An internal temperature sampling circuit is used to collect the temperature inside the intelligent power module.

26. The protection circuit according to claim 25, wherein, The temperature sampling circuit includes multiple winding temperature sampling circuits, which are connected to the control module and are used to collect the temperature of each phase winding of the motor.

27. The protection circuit according to claim 25, wherein, The temperature sampling circuit includes multiple copper busbar temperature sampling circuits, which are connected to the control module and are used to collect the copper busbar temperature of each copper busbar in the intelligent power module.

28. The protection circuit according to claim 25, wherein, The temperature sampling circuit includes multiple internal temperature sampling circuits located within the intelligent power module, which are used to collect temperature signals from different locations within the intelligent power module.

29. The protection circuit according to any one of claims 14, 25-28, wherein, The temperature sampling circuit includes: A non-inverting amplifier circuit is connected to a temperature sensor for detecting the temperature of the target component and the control module for amplification processing, and sends the amplified temperature signal to the control module.

30. The protection circuit of claim 29, wherein, The temperature sampling circuit further includes at least one of the following: A seventh filtering circuit is adapted to be connected to the temperature sensor and the non-inverting amplifier circuit to filter the temperature signal detected by the temperature sensor. The eighth filter circuit is connected to the in-phase amplifier circuit and the control module to filter the amplified temperature signal.

31. The protection circuit of claim 30, wherein, The temperature sampling circuit further includes at least one of the following: A pull-up power supply circuit, which is adapted to be connected to the temperature sensor and a preset power supply; The third clamping circuit is connected to the eighth filter circuit and the control module.

32. A protection and control method for an electric drive system, wherein, The protection control method for the protection circuit according to any one of claims 1-31 includes: Acquire various sampling signals from the electric drive system; When at least two of the sampling signals of the electric drive system are abnormal, protection measures for the electric drive system are executed.

33. The protective control method of claim 32, wherein, The various sampling signals of the electric drive system include at least two of the following: bus voltage signal, motor winding current signal, temperature signal of the target component of the electric drive system, resolver signal corresponding to motor speed, and fault detection signal of intelligent power module.

34. The protection and control method according to claim 33, wherein, The temperature signal of the target component of the electric drive system includes at least one of the following: the winding temperature of the motor, the copper plate temperature of the intelligent power module, and the internal temperature of the intelligent power module.

35. The protection and control method according to any one of claims 32-34, wherein, The implementation of protective measures for the electric drive system includes: A protection control signal is sent to cut off the power supply to the circuit breaker connecting the intelligent power module of the electric drive system and the motor of the electric drive system, thereby disconnecting the intelligent power module from the motor.

36. An electric drive system, wherein, Includes the protection circuit described in any one of claims 1-31.

37. The electric drive system according to claim 36, wherein, The electric drive system also includes a drive module, an intelligent power module, and a motor. The drive module is connected to the intelligent power module and is also connected to the control module in the protection circuit. The motor is connected to the intelligent power module through a circuit breaker in the protection circuit.

38. A motor control circuit, wherein, The motor control circuit includes: A detection circuit is used to detect parameters generated by the back electromotive force produced by the motor; and A protection circuit is used to disconnect the motor from the motor drive circuit when the detection parameter meets the first condition.

39. The motor control circuit according to claim 38, wherein, The detection parameters include: At least one of current and temperature.

40. The motor control circuit according to claim 39, wherein, The detection circuit is also used for: In response to a fault in the inverter in the motor drive circuit and / or a fault in the inverter's drive circuit, the detection parameter generated by the back electromotive force produced by the motor is detected.

41. The motor control circuit according to claim 40, wherein, The detection circuit includes: A current sensor is used to detect the phase current of each phase cable between the inverter and the motor.

42. The motor control circuit according to claim 40, wherein, The detection circuit includes: The first temperature sensor is used to detect the temperature of each arm in the inverter.

43. The motor control circuit according to claim 40, wherein, The detection circuit includes: The second temperature sensor is used to detect the temperature of each phase cable between the inverter and the motor.

44. The motor control circuit according to claim 40, wherein, The detection circuit includes: The third temperature sensor is used to detect the temperature of each winding in the motor.

45. The motor control circuit according to claim 38, wherein, The motor control circuit also includes: A controller is connected to the detection circuit and the protection circuit, and the controller is used to control the protection circuit to disconnect according to the detection parameters.

46. ​​The motor control circuit according to claim 45, wherein, The protection circuit includes: A switch is used to disconnect the motor from the motor drive circuit under the control of the controller.

47. The motor control circuit according to claim 46, wherein, A switch is installed on each phase cable between the inverter and the motor in the motor drive circuit.

48. The motor control circuit according to claim 45, wherein, The protection circuit includes: A fuse is used to disconnect the motor from the motor drive circuit under the control of the controller.

49. The motor control circuit according to claim 48, wherein, The fuse is connected to the first power supply; one fuse is installed on each phase cable between the inverter and the motor in the motor drive circuit. The first power supply is used to provide fusing current to the fuse under the control of the controller, and the fuse is used to disconnect the motor from the motor drive circuit under the action of the fusing current.

50. The motor control circuit according to claim 45, wherein, The controller includes: A detection module is used to detect faults in the inverter and / or the inverter's drive circuit in the motor drive circuit.

51. A motor control method, wherein, include: Based on the detection parameters generated by the back electromotive force produced by the motor, the control protection circuit disconnects the motor from the motor drive circuit.

52. The motor control method according to claim 51, wherein, The method further includes: In response to a fault in the inverter in the motor drive circuit and / or a fault in the inverter's drive circuit, the detection parameter generated by the back electromotive force produced by the motor is detected.

53. The motor control method according to claim 52, wherein, The step of controlling the protection circuit to maintain or disconnect the connection between the motor and the motor drive circuit based on the detection parameters generated by the back electromotive force generated by the motor includes: When the detection parameter meets the first condition, the protection circuit disconnects the connection between the motor and the inverter.

54. The motor control method according to claim 53, wherein, When the detection parameter meets the first condition, the protection circuit disconnects the motor from the motor's drive circuit, including: When the absolute value of the phase current integral of any phase cable connected to the inverter is greater than a first threshold, at least two phases of the multiphase cable between the inverter and the motor are disconnected.

55. The motor control method according to claim 53, wherein, When the detection parameter meets the first condition, the protection circuit disconnects the motor from the motor's drive circuit, including: When the temperature difference between two of the multiple arms of the inverter is greater than a first temperature difference threshold, at least two phases of the multiphase cable between the inverter and the motor are disconnected.

56. The motor control method according to claim 53, wherein, When the detection parameter meets the first condition, the protection circuit disconnects the motor from the motor's drive circuit, including: When the temperature of each of the multiple arms of the inverter is greater than the temperature of the first arm, at least two phases of the multiphase cable between the inverter and the motor are disconnected.

57. The motor control method according to claim 53, wherein, When the detection parameter meets the first condition, the protection circuit disconnects the motor from the motor's drive circuit, including: When the temperature difference between two phases of the multiphase cable between the inverter and the motor is greater than a second temperature difference threshold, at least two phases of the multiphase cable are disconnected.

58. The motor control method according to claim 53, wherein, When the detection parameter meets the first condition, the protection circuit disconnects the motor from the motor's drive circuit, including: When the temperature of each phase of the multiphase cable between the inverter and the motor is greater than the temperature of the first cable, at least two phases of the multiphase cable are disconnected.

59. The motor control method according to claim 53, wherein, When the detection parameter meets the first condition, the protection circuit disconnects the motor from the motor's drive circuit, including: When the temperature difference between two windings in the motor exceeds a third temperature difference threshold, at least two phases of the multiphase cable between the inverter and the motor are disconnected.

60. The motor control method according to claim 53, wherein, When the detection parameter meets the first condition, the protection circuit disconnects the motor from the motor's drive circuit, including: When the temperature of each of the multiple windings in the motor is greater than the temperature of the first winding, at least two phases of the multiphase cable between the inverter and the motor are disconnected.

61. A computer-readable storage medium having a computer program stored thereon, wherein, When executed by a processor, the computer program performs the steps of the method according to any one of claims 51 to 60.

62. A controller having a computer program stored thereon, wherein, When executed by a processor, the computer program performs the steps of the method according to any one of claims 51 to 60.

63. A motor control module, wherein, Includes the motor control circuit as described in any one of claims 38 to 50.

64. A vehicle, wherein, It includes the electric drive system of claim 36 or 37, or the motor control module of claim 63, or the motor control circuit of any one of claims 38 to 50.

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