Protection circuit, protection control method of electric drive system, electric drive system and vehicle

Abstract

The invention discloses a protection circuit, a protection control method of an electric drive system, the electric drive system and a vehicle. The protection circuit comprises a sampling module and a control module. The sampling module is used for obtaining multiple sampling signals of the electric drive system, and the control module is connected with the sampling module and used for executing protection measures on the electric drive system when at least two sampling signals in the multiple sampling signals of the electric drive system are abnormal. The protection circuit can collect various signals for comprehensive processing, all signal processing is carried out in the control module, an external signal processing circuit does not need to be added, the overall structure does not need to be optimized, whether the electric drive system is protected or not is comprehensively decided by considering various different types of sampling signals, the safety and reliability are improved, and the cost is reduced. And misjudgment caused by abnormal sampling or damage of the sampling module is avoided.

Description

Technical Field

[0001] The present invention relates to the field of vehicles, and in particular to a protection circuit, a protection control method of an electric drive system, an electric drive system and a vehicle. Background Art

[0002] In the related art, when the electric drive system fails and fault processing is performed to protect the safety of the vehicle and personnel, the voltage signal is collected, and the analysis of whether to perform electric drive protection is based on the voltage sampling signal, and a protection signal is output when protection is required. However, when the voltage sampling module samples abnormally or is damaged, it will cause misjudgment, and the safety and reliability are low. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide a protection circuit that can collect multiple signals for comprehensive processing, all signal processing is done in the control module, no external signal processing circuit is needed, the overall structure is optimized, and by considering multiple different types of sampling signals, a comprehensive decision is made on whether to protect the electric drive system, thereby improving safety and reliability and avoiding misjudgment caused by abnormal sampling or damage of the sampling module.

[0004] The second objective of the present invention is to provide a protection control method for an electric drive system.

[0005] The third objective of the present invention is to provide an electric drive system.

[0006] A fourth object of the present invention is to provide a vehicle.

[0007] In order to solve the above problems, an embodiment of the first aspect of the present invention provides a protection circuit, including: a sampling module, used to obtain multiple sampling signals of an electric drive system; a control module, the control module is connected to the sampling module, and is used to execute protection measures for the electric drive system when at least two of the sampling signals of the electric drive system are abnormal.

[0008] According to the protection circuit of the embodiment of the present invention, the sampling module collects various types of sampling signals in the electric drive system and transmits the collected signals to the control module. All signal processing is performed in the control module, and there is no need to add external signal processing circuits. The overall structure is optimized. By considering various types of sampling signals, a comprehensive decision is made whether to protect the electric drive system, thereby improving safety and reliability and avoiding misjudgment caused by abnormal sampling or damage of the sampling module.

[0009] In some embodiments, the protection circuit includes: a circuit breaker, which is connected to the power control unit, and the circuit breaker is also connected to the power supply to supply power, the circuit breaker is suitable for being connected between the intelligent power module of the electric drive system and the motor winding of the electric drive system, and the circuit breaker is used to disconnect in response to the cut-off signal to protect the electric drive system.

[0010] In some embodiments, the protection circuit also includes a power supply, which is connected to the power supply end of the circuit breaker to power 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 of the circuit breaker to the power supply when at least two of the sampling signals are abnormal, so that the circuit breaker is disconnected.

[0011] In some embodiments, the control module includes: a main control unit, which is connected to the sampling module and is used to send a protection control signal when at least two of the sampling signals of the electric drive system are abnormal; a power supply control unit, which is connected to the main control unit, the power supply, and the circuit breaker, and the power supply control unit is used to send a cut-off signal in response to the protection control signal to cut off the power supply of the power supply to the circuit breaker.

[0012] In some embodiments, the power control unit includes: a power control trigger subunit, 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, and the power control trigger subunit is used to send a power disconnection trigger signal in response to the protection control signal.

[0013] In some embodiments, the power control unit also includes: a power connection control subunit, a first end of the power connection control subunit is connected to the fourth end of the power control trigger subunit, a second end of the power connection control subunit is connected to the power supply, and a third end of the power connection control subunit is connected to the circuit breaker, and is used to cut off the power supply to the circuit breaker from the power supply in response to the power disconnection trigger signal to issue the cut-off signal.

[0014] In some embodiments, the power control trigger subunit includes: a first resistor, a first end of the first resistor is connected to the preset power supply, and a second end of the first resistor is connected to the main control unit; a second resistor, a first end of the second resistor is connected to the second end of the first resistor and the main control unit; a third resistor, a first end of the third resistor is connected to the main control unit, the second end of the first resistor, and the first end of the second resistor, and the second end of the third resistor is grounded; a first switch tube, a control end of the first switch tube is connected to the second end of the second resistor, a first end of the first switch tube is connected to the power connection control subunit, a second end of the first switch tube is connected to the second end of the third resistor, and the second end of the first switch tube is grounded.

[0015] In some embodiments, the power connection control subunit includes: a fourth resistor, a first end of the fourth resistor is connected to the power supply of the circuit breaker, and a second end of the fourth resistor is connected to the first end of the first switch tube; a second switch tube, a control end of the second switch tube is connected to the first end of the first switch tube and the second end of the fourth resistor, a first end of the second switch tube is connected to the power supply of the circuit breaker and the first end of the fourth resistor, and a second end of the second switch tube is connected to the circuit breaker.

[0016] In some embodiments, when the main control unit does not issue the protection control signal, the main control unit outputs a low-level signal to the power control unit, the preset power supply is grounded through a first resistor, the control end of the first switch tube is at a low level, the first switch tube is not conducting, the power supply of the circuit breaker is blocked by the first switch tube through the fourth resistor, the control end of the second switch tube is at a high level, the second switch tube is not conducting, and the circuit breaker is in a closed state.

[0017] In some embodiments, when the main control unit sends the protection control signal, the main control unit outputs a high-level signal to the power control unit, and the preset power supply is transmitted to the control end of the first switch tube through the first resistor and the second resistor. The control end of the first switch tube is at a high level, the first switch tube is turned on, and the power supply of the circuit breaker is grounded through the fourth resistor and the first switch tube. The control end of the second switch tube is at a low level, the second switch tube is turned on, and the circuit breaker is disconnected to cut off the connection between the intelligent power module and the motor winding of the electric drive system.

[0018] In some embodiments, the circuit breaker includes: a disconnect switch, which is suitable for being 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 the power-off signal.

[0019] In some embodiments, the sampling module is at least one of a speed sampling circuit and a copper busbar temperature sampling circuit, wherein the speed sampling circuit is used to collect a resolver signal corresponding to the motor speed, and the copper busbar temperature sampling circuit is used to collect the temperatures of each copper busbar of the intelligent power module of the electric drive system.

[0020] In some embodiments, the rotation speed sampling circuit and / or the copper busbar temperature sampling circuit are integrated into the circuit breaker.

[0021] 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 collecting the bus voltage signal of the electric drive system; a current sampling circuit, connected to the control module, for collecting the winding current signal of the motor of the electric drive system; a temperature sampling circuit, connected to the control module, for collecting the temperature signal of the target component of the electric drive system; a speed sampling circuit, connected to the control module, for collecting the resolver signal corresponding to the motor speed; an intelligent power module fault detection circuit, connected to the control module, for obtaining the fault detection signal of the intelligent power module.

[0022] In some embodiments, the bus voltage sampling circuit includes: a first differential operation circuit, the first end of the first differential operation circuit is suitable for connecting to the bus positive pole of the electric drive system and the bus negative pole of the electric drive system, and the second end of the first differential operation circuit is connected to the control module for generating a bus voltage signal.

[0023] In some embodiments, the bus voltage sampling circuit also includes at least one of the following: a first filtering circuit, the first filtering circuit is suitable for connecting to the bus positive pole, the bus negative pole, and the first differential operation circuit to filter the input bus signal; a second filtering circuit, 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, the first clamping circuit is at least connected to the control module.

[0024] In some embodiments, the current sampling circuit includes: a voltage divider circuit, which is suitable for connecting to the motor winding to obtain a voltage divider signal; and a voltage follower, which is connected to the control module and is used to amplify the voltage divider signal and send the amplified voltage divider signal to the control module to obtain a corresponding winding current signal.

[0025] In some embodiments, the current sampling circuit also includes: a third filtering circuit, which is connected to the voltage divider circuit and the voltage follower to filter the voltage divider signal; and a fourth filtering circuit, which is connected to the voltage follower and the control module to filter the amplified voltage divider signal.

[0026] In some embodiments, the current sampling circuit further includes: a second clamping circuit, wherein the second clamping circuit is connected to the fourth filtering circuit and the control module.

[0027] In some embodiments, the rotation speed sampling circuit is a resolver decoding chip, and the resolver decoding chip is connected to the control module to obtain the resolver signal.

[0028] In some embodiments, the intelligent power module fault detection circuit includes: an upper bridge fault detection circuit, adapted to be connected to an upper bridge circuit of the intelligent power module, and used to perform fault detection on the upper bridge circuit to obtain upper bridge fault detection information.

[0029] In some embodiments, the intelligent power module fault detection circuit further includes: a fifth filtering circuit connected to the upper bridge fault detection circuit and the control module, and configured to filter the upper bridge fault detection information.

[0030] 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 and used to perform fault detection on the lower bridge circuit to obtain lower bridge fault detection information.

[0031] 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, and configured to filter the lower bridge fault detection information.

[0032] In some embodiments, the temperature sampling circuit includes at least one of the following: a winding temperature sampling circuit, used to collect the winding temperature of the motor of the electric drive system; a copper busbar temperature sampling circuit, used to collect the copper busbar temperature of the intelligent power module of the electric drive system; an internal temperature sampling circuit, used to collect the temperature inside the intelligent power module.

[0033] In some embodiments, the temperature sampling circuit includes a plurality of winding temperature sampling circuits, and the plurality of winding temperature sampling circuits are connected to the control module for respectively collecting the temperature of each phase winding of the motor.

[0034] In some embodiments, the temperature sampling circuit includes a plurality of copper bar temperature sampling circuits, and the plurality of copper bar temperature sampling circuits are connected to the control module for collecting the copper bar temperature of each copper bar of the intelligent power module.

[0035] In some embodiments, the temperature sampling circuit includes a plurality of the internal temperature sampling circuits, and the plurality of the internal temperature sampling circuits are located in the intelligent power module and are used to collect temperature signals at different positions inside the intelligent power module.

[0036] In some embodiments, the temperature sampling circuit includes: a common-phase proportional amplifier circuit, which is connected to a temperature sensor for detecting the temperature of the target component and the control module for amplifying and processing, and sending the amplified temperature signal to the control module.

[0037] In some embodiments, the temperature sampling circuit also includes at least one of the following: a seventh filtering circuit, which is suitable for connecting to the temperature sensor and the in-phase proportional amplifier circuit to filter the temperature signal detected by the temperature sensor; an eighth filtering circuit, which is connected to the in-phase proportional amplifier circuit and the control module to filter the amplified temperature signal.

[0038] In some embodiments, the temperature sampling circuit further includes at least one of the following: a pull-up power supply circuit, which is suitable for connecting to the temperature sensor and a preset power supply; and a third clamping circuit, which is connected to the eighth filtering circuit and the control module.

[0039] A second aspect of the present invention provides a protection control method for an electric drive system, which is used for the protection circuit described in the above embodiment. 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.

[0040] According to the protection and control method of the electric drive system of the embodiment of the present invention, multiple sampling signals in the electric drive system are acquired in real time, and the acquired signals are transmitted to the control module. By considering the multiple sampling signals, a comprehensive decision is made 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 abnormal sampling or damage of the sampling module.

[0041] In some embodiments, the multiple sampling signals of the electric drive system include at least two of a bus voltage signal, a motor winding current signal, a temperature signal of a target component of the electric drive system, a resolver signal corresponding to the motor speed, and a fault detection signal of an intelligent power module.

[0042] In some embodiments, the temperature signal of the target component of the electric drive system includes at least one type of temperature signal selected from the group consisting of the winding temperature of the motor, the copper plate temperature of the intelligent power module, and the temperature inside the intelligent power module.

[0043] In some embodiments, executing protection measures for the electric drive system includes: sending a protection control signal to cut off the power supply of a circuit breaker connected between an intelligent power module of the electric drive system and a motor of the electric drive system, so that the intelligent power module is disconnected from the motor.

[0044] A third aspect of the present invention provides an electric drive system, comprising the protection circuit described in the above embodiment.

[0045] According to the electric drive system of the embodiment of the present invention, the protection circuit 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 the various types of sampling signals, a comprehensive decision is made whether to protect the electric drive system. When at least two types of sampling signals among the various 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 abnormal sampling or damage of the sampling module.

[0046] In some embodiments, 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 the drive module is also connected to the control module in the protection circuit. The motor is connected to the intelligent power module via a circuit breaker in the protection circuit.

[0047] A fourth aspect of the present invention provides a vehicle, comprising the electric drive system described in the above embodiment.

[0048] In a vehicle according to an embodiment of the present invention, a protection circuit acquires a variety of sampling signals in the electric drive system in real time, and transmits the acquired signals to a control module. By considering the various sampling signals, a comprehensive decision is made as to 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 abnormal sampling or damage of the sampling module.

[0049] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a structural block diagram of a protection circuit according to an embodiment of the present invention; Figure 2 is a schematic diagram of a protection circuit according to an embodiment of the present invention; Figure 3 is a schematic diagram of a power output control circuit according to an embodiment of the present invention; Figure 4 is a structural block diagram of a sampling module according to an embodiment of the present invention; Figure 5 is a schematic diagram of a bus voltage sampling circuit according to an embodiment of the present invention; Figure 6 is a schematic diagram of a current sampling circuit according to an embodiment of the present invention; Figure 7 is a schematic diagram of a resolver sampling circuit according to an embodiment of the present invention; Figure 8 is a schematic diagram of a fault detection circuit of an intelligent power module according to an embodiment of the present invention; Fig. 9 is a schematic diagram of a temperature sampling circuit according to an embodiment of the present invention; Fig.10 is a schematic diagram of a copper busbar temperature sampling circuit according to an embodiment of the present invention; Fig.11 is a schematic diagram of a motor winding temperature sampling circuit according to an embodiment of the present invention; Fig.12 is a flow chart of a protection control method for an electric drive system according to an embodiment of the present invention; Fig.13 is a schematic diagram of three-phase protection control according to an embodiment of the present invention; Fig.14 is a structural block diagram of an electric drive system according to an embodiment of the present invention; Fig.15 is a structural block diagram of a vehicle according to an embodiment of the present invention.

[0051] Reference numerals: Vehicles 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 tube Q1; fourth resistor R67; second switch tube Q2; circuit breaker 131; speed sampling circuit 101; copper bar 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 The invention comprises the following steps: a first differential operation circuit 301; a first filter circuit 302; a second filter circuit 303; a first clamp circuit 304; a voltage divider circuit 401; a third filter circuit 402; a voltage follower 403; a fourth filter circuit 404; a second clamp circuit 405; an upper bridge fault detection circuit 501; a fifth filter circuit 502; a lower bridge fault detection circuit 503; a sixth filter circuit 504; a pull-up power supply circuit 11; a seventh filter circuit 12; a common-mode proportional amplifier circuit 13; an eighth filter circuit 14; and a third clamp circuit 15. DETAILED DESCRIPTION

[0052] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0053] In the existing technology, the safety of new energy vehicles has always been the focus of attention of automobile companies and users. In the process of transferring the energy of the battery pack to the three-phase motor to drive the vehicle, if the electric drive system fails at this time, fault handling measures are required to protect the safety of the vehicle and personnel. The commonly used solution is to use three-phase active short circuit when a fault occurs in high-speed conditions, and use six-bridge open circuit after the vehicle speed drops. This solution is implemented by controlling the switch tube of the three-phase inverter bridge. After the fault disappears, the IPM (Intelligent Power Module) can work normally to drive the motor to work (vehicle driving); in the case of a three-phase inverter module failure, back electromotive force may be generated to cause uncontrollable damage to the three-phase inverter module and the battery pack (the switch tube of the three-phase inverter module explodes, burns, etc.). For this reason, when a fault is detected, the vehicle is limited in speed; another comprehensive solution: when an IPM fault is detected, a comprehensive decision is made based on information such as three-phase current, bus voltage, and motor speed. When the worst case may cause serious damage to the IPM and the battery pack, the three-phase line is actively disconnected to avoid abnormal energy accumulation of back electromotive force in the IPM.

[0054] The existing three-phase protection circuit includes: a circuit with the same three-phase structure and a signal generating circuit, wherein each phase circuit includes a sampling circuit and a state detection circuit; the sampling circuit is connected to the power module, and is used to output a voltage sampling signal according to the input voltage signal; the state detection circuit is respectively connected to the sampling circuit and the signal generating circuit, and is used to output undervoltage and phase loss state signals according to the voltage sampling signal. As long as any phase circuit in the three-phase circuit is undervoltage or phase loss, the three-phase protection circuit will be triggered to generate a protection signal. This solution only samples the three-phase voltage and then outputs the protection signal, which may result in misjudgment, and the final measures for the protection signal are not clearly given. For the electric drive system, the three-phase voltage sampling is relatively simple.

[0055] In order to solve the above problems, the first aspect of the embodiment of the present invention provides a protection circuit, which can collect multiple signals for comprehensive processing. All signal processing is done in the control module, without the need to add external signal processing circuits, thereby optimizing the overall structure. By considering multiple different types of sampling signals, a comprehensive decision is made as to whether to protect the electric drive system, thereby improving safety and reliability and avoiding misjudgment caused by abnormal sampling or damage of the sampling module.

[0056] like Figure 1 As shown, the protection circuit 100 includes: a sampling module 110 and a control module 120 .

[0057] The sampling module 110 is used to obtain a variety of sampling signals of the electric drive system; the control module 120 is connected to the sampling module 110 and is used to execute protective measures for the electric drive system when at least two sampling signals of the electric drive system are abnormal.

[0058] Specifically, the sampling module 110 obtains multiple sampling signals in the electric drive system, and the multiple sampling signals include more than two sampling signals. The control module 120 is connected to the sampling module 110. The control module 120 continuously receives and analyzes the signals transmitted by the sampling module 110. If the control module 120 detects that at least two of the sampling signals of the electric drive system are abnormal, it means that the electric drive system may have a fault. In this case, the control module 120 will respond quickly and execute protection measures for the electric drive system.

[0059] According to the protection circuit of the embodiment of the present invention, the sampling module collects various types of sampling signals in the electric drive system and transmits the collected signals to the control module. All signal processing is performed in the control module, and there is no need to add external signal processing circuits. The overall structure is optimized. By considering various types of sampling signals, a comprehensive decision is made whether to protect the electric drive system, thereby improving safety and reliability and avoiding misjudgment caused by abnormal sampling or damage of the sampling module.

[0060] In some embodiments, Figure 2 As shown, the protection circuit 100 includes: a circuit breaker 130 .

[0061] The circuit breaker 130 is connected to the power control unit 122. Figure 3 The power supply 123 shown in the figure is connected to supply power, and the circuit breaker 130 is suitable for being 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.

[0062] Specifically, when the power control unit 122 sends a cut-off signal, the circuit breaker 130 is disconnected, 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.

[0063] In some embodiments, Figure 3 As shown, the protection circuit 100 includes: a power supply 123 .

[0064] The power supply 123 is connected to the power supply terminal of the circuit breaker 130 to supply power to the circuit breaker.

[0065] 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 123 to the circuit breaker 130 to disconnect the circuit breaker 130.

[0066] In some embodiments, Figure 1 As shown, the control module 120 includes: a main control unit 121 and a power control unit 122 .

[0067] Among them, the main control unit 121 is connected to the sampling module 110, and is used to send a protection control signal when at least two sampling signals of the electric drive system are abnormal; the power supply control unit 122 is connected to the main control unit 121 and the power supply 123, and the power supply control unit 122 is used to send a cut-off signal in response to the protection control signal to cut off the connection between the intelligent power module in the electric drive system and the motor winding to protect the electric drive system.

[0068] Specifically, the main control unit 121 is connected to the sampling module 110, and obtains 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 an abnormal situation occurs in the system, it can effectively prevent the fault from further expanding, thereby protecting the safe and stable operation of the entire electric drive system.

[0069] In some embodiments, Figure 3 As shown, the power control unit 122 includes: a power control trigger subunit 21.

[0070] 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 send a power disconnection trigger signal in response to the protection control signal.

[0071] In some embodiments, Figure 3 As shown, the power control unit 122 also includes: a power connection control subunit 22 .

[0072] 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 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, which is used to cut off the power supply 123 to the circuit breaker 130 in response to the power disconnection trigger signal to issue a cut-off signal.

[0073] In some embodiments, Figure 3 As shown, the power control trigger subunit 21 includes: a first resistor R64, a second resistor R65, a third resistor R66 and a first switch tube Q1.

[0074] 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 end of the first switch tube Q1 is connected to the second end of the second resistor R65, the first end of the first switch tube Q1 is connected to the power connection control subunit 22, the second end of the first switch tube Q1 is connected to the second end of the third resistor R66, and the second end of the first switch tube Q1 is grounded.

[0075] In some embodiments, Figure 3 As shown, the power connection control subunit 22 includes: a fourth resistor R67 and a second switch tube Q2.

[0076] 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 tube Q1; the control end of the second switch tube Q2 is connected to the first end of the first switch tube Q1 and the second end of the fourth resistor R67, the first end of the second switch tube 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 tube Q2 is connected to the circuit breaker 130.

[0077] In an embodiment, the first switch tube Q1 may be an NPN transistor, and the second switch tube Q2 may be a PMOS transistor, or the first switch tube Q1 and the second switch tube Q2 may be other switching devices or non-switching devices that can realize the above functions.

[0078] like Figure 3As shown in the three-phase circuit breaker power supply output control circuit diagram, when the control module makes a comprehensive analysis of the sampled data and decides not to output the protection signal, the left main control unit 121 connected to the third resistor R66 outputs a low level (grounded), the VDD3.3V power supply is pulled up to the ground through the first resistor R64, the base of the connection point between the first switch tube Q1 and the second resistor R65 is at a low level, the collector and emitter of the first switch tube Q1 are not conducting, the +12V power supply is blocked by the first switch tube Q1 through the fourth resistor R67, at this time, the gate of the second switch tube Q2 is at a high level, the drain and source of the second switch tube Q2 are not conducting, and there is no power supply at the three-phase circuit breaker power supply output end; when When the control module makes a comprehensive analysis of the sampled data and decides to output a protection signal, the left main control unit 121 connected to the third resistor R66 outputs a high level (VDD3.3V), and the VDD3.3V power supply is pulled up through the first resistor R64 and the second resistor R65. The base of the connection point between the first switch tube Q1 and the second resistor R65 is at a high level, the collector and emitter of the first switch tube Q1 are turned on, and the +12V power supply is grounded through the fourth resistor R67 and the first switch tube Q1. At this time, the gate of the second switch tube Q2 is at a low level, the drain and source of the second switch tube Q2 are turned on, and there is power at the power output end of the three-phase circuit breaker, and the three-phase circuit breaker will disconnect the three-phase copper busbar.

[0079] In some embodiments, Figure 3 As shown, when the main control unit 121 does not send 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 end of the first switch tube Q1 is at a low level, the first switch tube Q1 is not conducting, the power supply 123 of the circuit breaker 130 is blocked by the first switch tube Q1 through the fourth resistor R67, the control end of the second switch tube Q2 is at a high level, the second switch tube Q2 is not conducting, and the circuit breaker 130 is in a closed state.

[0080] In some embodiments, Figure 3 As shown, when the main control unit 121 sends a protection control signal, the main control unit 121 outputs a high-level signal to the power control unit 122, and the preset power supply is transmitted through the first resistor R64 and the second resistor R65 to the control end of the first switch tube Q1. The control end of the first switch tube Q1 is at a high level, the first switch tube Q1 is turned on, and the power supply 123 of the circuit breaker 130 is grounded through the fourth resistor R67 and the first switch tube Q1. The control end of the second switch tube Q2 is at a low level, the second switch tube Q2 is turned on, and 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.

[0081] In some embodiments, Figure 2 As shown, the circuit breaker 130 includes: a circuit breaker 131 .

[0082] 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 a cut-off electrical signal.

[0083] In some embodiments, Figure 4 As shown, the sampling module 110 can be at least one of a rotation speed sampling circuit 101 and a copper busbar temperature sampling circuit 102 .

[0084] 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 temperatures 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 in the circuit breaker 130.

[0085] In some embodiments, the rotation speed sampling circuit 101 and / or the copper busbar temperature sampling circuit 102 are integrated into the circuit breaker 130 .

[0086] In some embodiments, Figure 4 As shown, 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 Figure 4 The temperature sampling circuit 10 is shown.

[0087] Specifically, the protection circuit 100 includes at least two types of sampling circuits including 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. The bus voltage sampling circuit 103 is connected to the control module 120 to collect the bus voltage signal of the electric drive system; the current sampling circuit 104 is connected to the control module 120 to collect the winding current signal of the motor of the electric drive system; the temperature sampling circuit 10 is connected to the control module 120 to collect the temperature signal of the target component of the electric drive system; the speed sampling circuit 101 is connected to the control module 120 to collect the resolver signal corresponding to the motor speed; the intelligent power module fault detection circuit 105 is connected to the control module 120 to obtain the fault detection signal of the intelligent power module.

[0088] In some embodiments, Figure 5 As shown, the bus voltage sampling circuit 103 includes: a first differential operation circuit 301 .

[0089] Specifically, the first end of the first differential operation circuit 301 is suitable for connecting to the positive pole of the bus of the electric drive system and the negative pole of the bus of the electric drive system, and the second end of the first differential operation circuit 301 is connected to the control module to generate a bus voltage signal.

[0090] In some embodiments, Figure 5 As shown, the bus voltage sampling circuit 103 includes: at least one of a first filtering circuit 302 , a second filtering circuit 303 and a first clamping circuit 304 .

[0091] Specifically, the first filter circuit 302 is suitable for connecting with the bus positive pole, the bus negative pole, and the first differential operation circuit 301 to filter the input bus signal; the second filter circuit 303 is connected with the first differential operation circuit 301 and the control module 120 to filter the bus voltage signal; the first clamp circuit 304 is connected with the control module 120, or the first clamp circuit 304 is connected with the second filter circuit 303 and the control module 120. The first clamp circuit 304 may include the first clamp diode D1 in the figure, and further, as shown in the figure, the first clamp circuit 304 may also include a voltage stabilizing diode to play a voltage stabilizing role.

[0092] For example, Figure 5 The bus voltage sampling circuit shown includes a filtering circuit, a differential operation circuit and a clamping circuit. The bus voltage sampling is filtered by the first capacitor C1 and the second capacitor C2, and then passes through the differential operation circuit composed of resistors R1, R2, R3, R4, and the first operational amplifier IC1, and finally passes through the RC filtering composed of the fifth resistor R5 and the third capacitor C3 and the first clamping diode D1 for clamping before being output to the analog-to-digital converter of the control module for sampling.

[0093] In some embodiments, Figure 6 As shown, the current sampling circuit 104 includes: a voltage divider circuit 401 and a voltage follower 403 .

[0094] Among them, the voltage divider circuit 401 is suitable for connecting to the motor winding to obtain a voltage divider signal; the voltage follower 403 is connected to the control module 120, used 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.

[0095] In some embodiments, Figure 6 As shown, the current sampling circuit 104 includes: a third filtering circuit 402 and a fourth filtering circuit 404 .

[0096] 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.

[0097] In some embodiments, Figure 6As shown, the current sampling circuit 104 further includes: a second clamping circuit 405 .

[0098] The second clamping circuit 405 is connected to the fourth filtering circuit 404 and the control module 120 .

[0099] For example, Figure 6 The three-phase current sampling circuit shown includes a voltage divider circuit, a filter circuit, a voltage follower circuit, and a clamp circuit. In an embodiment, the second clamp circuit 405 may include a clamp diode. Further, as shown in the figure, the second clamp circuit 405 may also include a voltage stabilizing diode to achieve a voltage stabilizing effect.

[0100] The U-phase current sampling is divided to ground by the seventh resistor R7 and then filtered by the RC filter composed of the sixth resistor R6 and the fourth capacitor C4, and then clamped by the second operational amplifier IC2 (voltage follower) and the RC filter composed of the eighth resistor R8 and the fifth capacitor C5 and the second clamping diode D2 before being output to the control module analog-to-digital converter for sampling.

[0101] The V-phase current sampling is divided to the ground by the tenth resistor R10 and then filtered by the RC filter composed of the ninth resistor R9 and the sixth capacitor C6. Then, it is clamped by the third operational amplifier IC3 (voltage follower) and the RC filter composed of the eleventh resistor R11 and the seventh capacitor C7 and the third clamping diode D3 before being output to the control module analog-to-digital converter for sampling.

[0102] The W-phase current sampling is divided to the ground by the thirteenth resistor R13, and then filtered by the RC filter composed of the twelfth resistor R12 and the eighth capacitor C8, and then clamped by the fourth operational amplifier IC4 (voltage follower) and the RC filter composed of the fourteenth resistor R14 and the ninth capacitor C9, and the fourth clamping diode D4, and then output to the control module analog-to-digital converter for sampling.

[0103] In some embodiments, Figure 7 As shown, the speed sampling circuit is a resolver decoding chip, and the resolver decoding chip is connected to the control module to obtain a resolver signal.

[0104] Specifically, Figure 7 The resolver sampling circuit shown uses a resolver decoding chip to provide an excitation signal to the resolver, and simultaneously samples and decodes the SIN and COS signals, and finally outputs them to the control module analog-to-digital converter for sampling.

[0105] In some embodiments, Figure 8 As shown, the intelligent power module fault detection circuit 105 includes: an upper bridge fault detection circuit 501 .

[0106] Specifically, the upper bridge fault detection circuit 501 is suitable for being connected to the upper bridge circuit of the intelligent power module, and is used to perform fault detection on the upper bridge circuit to obtain upper bridge fault detection information.

[0107] In some embodiments, Figure 8 As shown, the intelligent power module fault detection circuit 105 further includes: a fifth filtering circuit 502 .

[0108] Specifically, the fifth filtering circuit 502 is connected to the upper bridge fault detection circuit 501 and the control module 120 , and is used to perform filtering processing on the upper bridge fault detection information.

[0109] In some embodiments, Figure 8 As shown, the intelligent power module fault detection circuit 105 includes: a lower bridge fault detection circuit 503 .

[0110] Specifically, the lower bridge fault detection circuit 503 is suitable for being connected to the lower bridge circuit of the intelligent power module, and is used to perform fault detection on the lower bridge circuit to obtain lower bridge fault detection information.

[0111] In some embodiments, Figure 8 As shown, the intelligent power module fault detection circuit 105 further includes: a sixth filtering circuit 504 .

[0112] Specifically, the sixth filtering circuit 504 is connected to the lower bridge fault detection circuit 503 and the control module 120 , and is used to perform filtering processing on the lower bridge fault detection information.

[0113] For example, Figure 8 The IPM fault detection circuit shown includes a filter circuit. The upper bridge IPM fault detection circuit is output to the control module GPIO (General-purpose input / output) port for processing after being filtered by the RC composed of the 30th resistor R30 and the 19th capacitor C19. The lower bridge IPM fault detection circuit is output to the control module GPIO port for processing after being filtered by the RC composed of the 31st resistor R31 and the 20th capacitor C20.

[0114] In some embodiments, Figure 4 As shown, the temperature sampling circuit 10 includes: at least one of a winding temperature sampling circuit 106 , a copper bar temperature sampling circuit 102 and an internal temperature sampling circuit 107 .

[0115] Specifically, the winding temperature sampling circuit 106 is used to collect the winding temperature of the motor of the electric drive system; the copper bar temperature sampling circuit 102 is used to collect the copper bar temperature of the intelligent power module of the electric drive system; and the internal temperature sampling circuit 107 is used to collect the temperature inside the intelligent power module.

[0116] In some embodiments, the temperature sampling circuit 10 includes a plurality of winding temperature sampling circuits 106 , and the plurality of winding temperature sampling circuits 106 are connected to the control module 120 for respectively collecting the temperature of each phase winding of the motor.

[0117] 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 required to monitor the temperature of each phase separately. The winding temperature sampling circuit 106 is connected to the control module 120. The control module 120 receives temperature data from the winding temperature sampling circuit 106 and performs analysis and decision-making based on this data.

[0118] In some embodiments, the temperature sampling circuit 10 includes a plurality of copper bar temperature sampling circuits 102 , which are connected to the control module 120 and are used to collect the copper bar temperature of each copper bar of the intelligent power module.

[0119] Specifically, multiple copper busbar temperature sampling circuits 102 are specifically used to collect the temperature of each copper busbar in the intelligent power module. The copper busbar is an important component for transmitting current in the power conversion process, and its temperature is a key indicator for evaluating the working status of the intelligent power module. The copper busbar temperature sampling circuit 102 is connected to the controller 120. The controller 120 receives temperature data from the copper busbar temperature sampling circuit 102, and further processes and analyzes it to timely discover potential overheating problems, thereby realizing accurate monitoring and protection of the temperature of each copper busbar in the intelligent power module.

[0120] In some embodiments, the temperature sampling circuit 10 includes a plurality of internal temperature sampling circuits 107 . The plurality of internal temperature sampling circuits 107 are located in the intelligent power module and are used to collect temperature signals at different locations inside the intelligent power module.

[0121] Specifically, due to the complex internal structure and components of the intelligent power module, the temperatures at different locations may vary significantly. Therefore, multiple internal temperature sampling circuits 107 are set at different locations inside the intelligent power module to fully cover and accurately collect temperature signals at different locations inside the intelligent power module, thereby achieving comprehensive monitoring of the temperatures at different locations inside the intelligent power module.

[0122] In some embodiments, Fig. 9 As shown, the temperature sampling circuit 10 includes: a common-mode proportional amplifier circuit 13 .

[0123] Specifically, the in-phase proportional amplifier circuit 13 is connected to a temperature sensor for detecting the temperature of a target component and the control module 120 for amplification processing and sending the amplified temperature signal to the control module 120 .

[0124] In some embodiments, Fig. 9 As shown, the temperature sampling circuit further includes at least one of the following: a seventh filtering circuit 12 and an eighth filtering circuit 14 .

[0125] Specifically, the seventh filter circuit 12 is suitable for connecting to the temperature sensor and the in-phase proportional amplifier circuit 13 to filter the temperature signal detected by the temperature sensor; the eighth filter circuit 14 is connected to the in-phase proportional amplifier circuit 13 and the control module 120 to filter the amplified temperature signal.

[0126] In some embodiments, Fig. 9 As shown, 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 .

[0127] Specifically, the pull-up power supply circuit 11 is suitable for being connected to a temperature sensor and a preset power supply; the seventh filter circuit 12 is suitable for being connected to a temperature sensor for filtering processing; the in-phase proportional amplifier circuit 13 is connected to the seventh filter circuit 12, the pull-up power supply circuit 11, and the temperature sensor for amplification processing; the eighth filter circuit 14 is connected to the in-phase proportional amplifier circuit 13 and the control module 120 for filtering processing; the third clamp circuit 15 is connected to the eighth filter circuit 14 and the control module 120.

[0128] For example, Fig. 9 The module temperature sampling circuit shown includes a pull-up power supply circuit, a filter circuit, a common-mode proportional amplifier circuit, and a clamp circuit. The module temperature sample 1 is pulled up to the VDD5V power supply by the 32nd resistor R32 and filtered by the 21st capacitor C21, and then passes through the common-mode proportional amplifier composed of the 33rd resistor R33, the 34th resistor R34, and the 8th operational amplifier IC8, and then passes through the RC filter composed of the 35th resistor R35 and the 22nd capacitor C22 and the 8th clamping diode D8 for clamping, and then output to the control module analog-to-digital converter for sampling. The voltage regulator diode above the 8th clamping diode D8 can play a role in voltage stabilization.

[0129] The module temperature sample 2 is pulled up to the VDD5V power supply by the 36th resistor R36 and filtered by the 23rd capacitor C23, and then passes through the in-phase proportional amplifier composed of the 37th resistor R37, the 38th resistor R38, and the 9th operational amplifier IC9, and then passes through the RC filter composed of the 39th resistor R39 and the 24th capacitor C24, and is clamped by the 9th clamping diode D9 before being output to the control module analog-to-digital converter for sampling. The voltage regulator diode above the 9th clamping diode D9 can play a role in voltage stabilization.

[0130] The module temperature sample 3 is pulled up to the VDD5V power supply by the 40th resistor R40 and filtered by the 25th capacitor C25, and then passes through the in-phase proportional amplifier composed of the 41st resistor R41, the 42nd resistor R42, and the 10th operational amplifier IC10, and then passes through the RC filter composed of the 43rd resistor R43, the 26th capacitor C26, and the 10th clamping diode D10, and then output to the control module analog digital converter for sampling. The voltage regulator diode above the 10th clamping diode D10 can play a role in voltage stabilization.

[0131] like Fig.10 The copper busbar temperature sampling circuit shown includes a pull-up power supply circuit, a filter circuit, a common-phase proportional amplifier circuit, and a clamping circuit.

[0132] The copper bar temperature sample 1 is pulled up to VDD5V power supply by the 44th resistor R44 and filtered by the 27th capacitor C27, and then passes through the in-phase proportional amplifier composed of the 45th resistor R45, the 46th resistor R46, and the 11th operational amplifier IC11, and then passes through the RC filter composed of the 47th resistor R47 and the 28th capacitor C28, and is clamped by the 11th clamping diode D11, and then output to the control module analog digital converter for sampling. The voltage regulator diode above the 11th clamping diode D11 can play a role in voltage stabilization.

[0133] The copper bar temperature sample 2 is pulled up by the 48th resistor R48 to the VDD5V power supply and filtered by the 29th capacitor C29, and then passes through the 49th resistor R49, the 50th resistor R50, and the 12th operational amplifier IC12 to form a common-phase proportional amplifier, and then passes through the 51st resistor R51, the 30th capacitor C30 RC filter and the 12th clamping diode D12 to be clamped and then output to the control module analog-to-digital converter for sampling. The voltage regulator diode above the 12th clamping diode D12 can play a role in voltage stabilization.

[0134] The copper bar temperature sample 3 is pulled up by the 52nd resistor R52 to the VDD5V power supply and filtered by the 31st capacitor C31, and then passes through the in-phase proportional amplifier composed of the 53rd resistor R53, the 54th resistor R54, and the 13th operational amplifier IC13, and then is clamped by the 55th resistor R55, the 32nd capacitor C32, and the 13th clamping diode D13, and then output to the control module analog digital converter for sampling. The voltage regulator diode above the 13th clamping diode D13 can play a role in voltage stabilization.

[0135] like Fig.11 The motor winding temperature sampling circuit shown includes a pull-up power supply circuit, a filter circuit, a common-phase proportional amplifier circuit, and a clamping circuit.

[0136] The motor winding temperature sample 1 is pulled up to the VDD5V power supply by the fifty-sixth resistor R56 and filtered by the thirty-third capacitor C33, and then passes through the in-phase proportional amplifier composed of the fifty-seventh resistor R57, the fifty-eighth resistor R58, and the fourteenth operational amplifier IC14, and then is output to the control module analog-to-digital converter for sampling after being filtered by the RC filter composed of the fifty-ninth resistor R59 and the thirty-fourth capacitor C34 and clamped by the fourteenth clamping diode D14. The voltage regulator diode above the fourteenth clamping diode D14 can play a role in voltage stabilization.

[0137] The motor winding temperature sample 2 is pulled up to the VDD5V power supply by the 60th resistor R60 and filtered by the 35th capacitor C35, and then passes through the in-phase proportional amplifier composed of the 61st resistor R61, the 62nd resistor R62, and the 15th operational amplifier IC15, and then is output to the control module analog-to-digital converter for sampling after being filtered by the 63rd resistor R63, the 36th capacitor C36, and the 15th clamping diode D15. The voltage regulator diode above the 15th clamping diode D15 can play a role in voltage stabilization.

[0138] Reference below Fig.12 A protection control method for an electric drive system according to an embodiment of the second aspect of the present invention is described. Fig.12 As shown, the method at least includes step S1 to step S2.

[0139] Step S1, obtaining multiple sampling signals of the electric drive system.

[0140] Specifically, the sampling module in the present invention obtains the sampling signals in the electric drive system, so it can detect multiple sampling signals of the electric drive system. When the control module detects that the multiple sampling signals of the electric drive system are abnormal, it means that the electric drive system may have a fault.

[0141] Step S2: When at least two of the multiple sampling signals of the electric drive system are abnormal, executing protection measures for the electric drive system.

[0142] Specifically, the control module is connected to the sampling module and obtains multiple 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 execute protection measures for the electric drive system. The protection measures can be to control the circuit breaker to disconnect and cut off the connection between the intelligent power module and the motor winding in the electric drive system. Under abnormal circumstances, it can also effectively prevent the fault from further expanding, thereby protecting the safe and stable operation of the entire electric drive system.

[0143] According to the protection and control method of the electric drive system of the embodiment of the present invention, multiple sampling signals in the electric drive system are acquired in real time, and the acquired signals are transmitted to the control module. By considering the multiple sampling signals, a comprehensive decision is made 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 abnormal sampling or damage of the sampling module.

[0144] In some embodiments, the multiple different sampling signals of the electric drive system include at least two of a bus voltage signal, a motor winding current signal, a temperature signal of a target component of the electric drive system, a resolver signal corresponding to the motor speed, and a fault detection signal of an intelligent power module.

[0145] Specifically, the bus voltage signal is used to monitor the battery status and estimate the remaining power. Voltage fluctuations beyond the normal range may cause system instability or damage. The motor winding current signal is used to evaluate the motor load, detect overload or short circuit conditions, and achieve precise current control. Excessive or insufficient current may indicate that the motor is faulty or the load is abnormal. The temperature signal of the target component of the electric drive system is used to monitor the temperature of key components inside the motor winding to prevent overheating and ensure the safe operation of the motor and peripheral systems. If the temperature exceeds the set threshold, the device may be damaged. The resolver signal corresponding to the motor speed provides high-precision speed information. Signal distortion or loss may cause inaccurate speed control or motor loss of control. The fault detection signal of the intelligent power module is used to detect the fault state of the intelligent power module. The fault signal is triggered, indicating that the module is faulty. When at least two of these signals are abnormal, corresponding protection measures should be taken to ensure the stability and safety of the system.

[0146] In some embodiments, the temperature signal of the target component of the electric drive system includes at least one type of temperature signal selected from the group consisting of motor winding temperature, copper plate temperature of the intelligent power module, and internal temperature of the intelligent power module.

[0147] 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, 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, and protect the electric drive system when the temperature exceeds the threshold.

[0148] In some embodiments, executing protection measures for the electric drive system includes: sending a protection control signal to cut off the power supply of a circuit breaker connected between an intelligent power module of the electric drive system and a motor of the electric drive system, so that the intelligent power module is disconnected from the motor.

[0149] Specifically, when the electric drive system detects an abnormality or fault, such as the motor winding temperature is too high or the intelligent power module is overheated, the system will immediately send a protection control signal, which is issued by the controller to quickly cut off the connection between the intelligent power module and the motor. In order to achieve the disconnection, a circuit breaker is set between the intelligent power module and the motor. After receiving the protection control signal, the circuit breaker will quickly cut off the power supply line between the intelligent power module and the motor to avoid possible damage caused by the electric drive system continuing to operate in an abnormal or faulty state.

[0150] For example, Figure 2 As shown, the three-phase protection scheme of the present invention is to sample the bus voltage, three-phase current, motor winding temperature, resolver signal, three-phase copper bar temperature, module temperature at the same time, and after the IPM fault is detected, the control module makes a comprehensive decision to control the driving power supply of the three-phase circuit breaker. The condition for the control module to generate a protection signal can be a method that must satisfy one signal abnormality and any other signal abnormality, or a method that must satisfy two signal abnormalities and any other signal abnormality (such as: the control module detects an IPM fault and a three-phase current abnormality, and then detects a three-phase copper bar temperature abnormality, then generates a protection signal to control the three-phase circuit breaker to energize); the above sampled and detected signals can be arbitrarily combined to control the generation of protection, because the protection action of the three-phase circuit breaker is to disconnect the three-phase copper bar (the three-phase circuit breaker needs to be replaced to restore the normal operation of the electric drive system), so when making a protection signal strategy, it is necessary to consider the impact of each signal abnormality on the IPM, motor, and battery to avoid false triggering of protection. In addition, the definition of signal abnormality is not limited to high and low signals.

[0151] Special note: the three-phase circuit breaker is connected in series to the three-phase copper busbar at the output end 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 energized to drive it to work, the three-phase copper busbar will be disconnected to disconnect the motor from the IPM for protection.

[0152] This solution uses multi-signal comprehensive processing, which can consider the characteristic performance of each module in the electric drive system (temperature, current, speed, etc.) to comprehensively decide whether to perform three-phase protection. Compared with the existing technology that only collects voltage signals for judgment, it is safer and more reliable, and can effectively reduce the misjudgment caused by abnormal or damaged sensor sampling in the system. Compared with the existing technology, this solution has 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, and controls the power output to the three-phase circuit breaker to disconnect the three-phase copper busbar. Fig.13 As shown, in this solution, all signal processing is done in the control module. It only requires the signal sampling to be input to the control module, and there is no need to add an external signal processing circuit.

[0153] A third aspect of the present invention provides an electric drive system, such as Fig.14 As shown, the electric drive system 800 includes: a protection circuit 100 .

[0154] According to the electric drive system of the embodiment of the present invention, the protection circuit 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 the various types of sampling signals, a comprehensive decision is made whether to protect the electric drive system. When at least two types of sampling signals among the various 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 abnormal sampling or damage of the sampling module.

[0155] In some embodiments, Fig.14 As shown, the electric drive system 800 further includes: a drive module 801 , an intelligent power module 802 and a motor 803 .

[0156] The driving module 801 is connected to the intelligent power module 802 , and the driving 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 via the circuit breaker 130 in the protection circuit.

[0157] A fourth aspect of the present invention provides a vehicle, such as Fig.15 As shown, vehicle 900 includes: an electric drive system 800 .

[0158] In a vehicle according to an embodiment of the present invention, a protection circuit acquires a plurality of different types of sampling signals in an electric drive system in real time, and transmits the acquired signals to a control module. By considering a plurality of different types of sampling signals, a comprehensive decision is made as to whether to protect the electric drive system. When at least two types of sampling signals among the plurality of different 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 abnormal sampling or damage of the sampling module.

[0159] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0160] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A protection circuit, characterized in that: include: Sampling module, used to obtain various sampling signals of the electric drive system; A control module is connected to the sampling module and is used to execute 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 according to claim 1, characterized in that: The protection circuit comprises: A circuit breaker is connected to the control module, the circuit breaker is suitable for being connected between the intelligent power module of the electric drive system and the motor winding of the electric drive system, and the circuit breaker is used to disconnect in response to a power-off signal to protect the electric drive system.

3. The protection circuit according to claim 2, characterized in that: The protection circuit further includes a power supply, which is connected to a 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 that the circuit breaker is disconnected.

4. The protection circuit according to claim 3, characterized in that: The control module comprises: A main control unit, the main control unit is connected to the sampling module and is used to send 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, and 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 according to claim 4, characterized in that: The power control unit comprises: A power control trigger subunit, wherein the first end of the power control trigger subunit is connected to the main control unit, the second end of the power control trigger subunit is connected to the power supply, the third end of the power control trigger subunit is connected to a preset power supply, and the power control trigger subunit is used to send a power disconnection trigger signal in response to the protection control signal.

6. The protection circuit according to claim 5, characterized in that: The power control unit also includes: A power connection control subunit, wherein the first end of the power connection control subunit is connected to the fourth end of the power control trigger subunit, the second end of the power connection control subunit is connected to the power supply, and the third end of the power connection control subunit is connected to the circuit breaker, for cutting off the power supply to the circuit breaker in response to the power disconnection trigger signal.

7. The protection circuit according to claim 6, characterized in that: The power control trigger subunit comprises: a first resistor, wherein a first end of the first resistor is connected to the preset power supply, and a second end of the first resistor is connected to the main control unit; a second resistor, wherein a first end of the second resistor is connected to a second end of the first resistor and the main control unit; a third resistor, wherein a first end of the third resistor is connected to the main control unit, a second end of the first resistor, and a first end of the second resistor, and a second end of the third resistor is grounded; A first switch tube, wherein the control end of the first switch tube is connected to the second end of the second resistor, the first end of the first switch tube is connected to the power connection control subunit, the second end of the first switch tube is connected to the second end of the third resistor, and the second end of the first switch tube is grounded.

8. The protection circuit according to claim 7, characterized in that: The power connection control subunit comprises: a fourth resistor, wherein a first end of the fourth resistor is connected to the power supply of the circuit breaker, and a second end of the fourth resistor is connected to the first end of the first switch tube; A second switch tube, wherein the control end of the second switch tube is connected to the first end of the first switch tube and the second end of the fourth resistor, the first end of the second switch tube is connected to the power supply of the circuit breaker and the first end of the fourth resistor, and the second end of the second switch tube is connected to the circuit breaker.

9. The protection circuit according to claim 8, characterized in that: When the main control unit does not send the protection control signal, the main control unit outputs a low-level signal to the power control unit, the preset power supply is grounded through the first resistor, the control end of the first switch tube is at a low level, the first switch tube is not turned on, the power supply of the circuit breaker is blocked by the first switch tube through the fourth resistor, the control end of the second switch tube is at a high level, the second switch tube is not turned on, and the circuit breaker is in a closed state.

10. The protection circuit according to claim 8, characterized in that: When the main control unit sends the protection control signal, the main control unit outputs a high-level signal to the power control unit, and the preset power supply is transmitted to the control end of the first switch tube through the first resistor and the second resistor. The control end of the first switch tube is at a high level, the first switch tube is turned on, and the power supply of the circuit breaker is grounded through the fourth resistor and the first switch tube. The control end of the second switch tube is at a low level, the second switch tube is turned on, and 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 to 10, characterized in that: The circuit breaker comprises: A circuit breaker switch 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 the power-off signal.

12. The protection circuit according to claim 11, characterized in that: 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 a resolver signal corresponding to the motor speed. 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 according to claim 12, characterized in that: The rotation speed sampling circuit and / or the copper busbar temperature sampling circuit are integrated in the circuit breaker.

14. The protection circuit according to any one of claims 1 to 10, characterized in that: The sampling modules include at least two of the following categories: A bus voltage sampling circuit, connected to the control module, for collecting a bus voltage signal of the electric drive system; A current sampling circuit, connected to the control module, for collecting winding current signals of the motor of the electric drive system; A temperature sampling circuit, connected to the control module, for collecting temperature signals of target components of the electric drive system; A speed sampling circuit is connected to the control module and is used to collect a resolver signal corresponding to the motor speed; The intelligent power module fault detection circuit is connected to the control module and is used to obtain a fault detection signal of the intelligent power module.

15. The protection circuit according to claim 14, characterized in that: The bus voltage sampling circuit comprises: A first differential operation circuit, wherein a first end of the first differential operation circuit is suitable for being connected to a positive pole of a bus of the electric drive system and a negative pole of a bus of the electric drive system, and a second end of the first differential operation circuit is connected to the control module for generating a bus voltage signal.

16. The protection circuit according to claim 15, characterized in that: The bus voltage sampling circuit further includes at least one of the following: A first filtering circuit, wherein the first filtering circuit is suitable for being connected to the positive electrode of the bus, the negative electrode of the bus, and the first differential operation circuit to filter the input bus signal; a second filtering circuit, connected to the first differential operation circuit and the control module, and configured to filter the bus voltage signal; A first clamping circuit, wherein the first clamping circuit is at least connected to the control module.

17. The protection circuit according to claim 14, characterized in that: The current sampling circuit comprises: A voltage divider circuit, wherein the voltage divider circuit is suitable for being connected to the motor winding to obtain a voltage divider signal; A voltage follower is connected to the control module and is used to amplify the voltage-divided signal and send the amplified voltage-divided signal to the control module to obtain the winding current signal.

18. The protection circuit according to claim 17, characterized in that: The current sampling circuit also includes: a third filtering circuit, the third filtering circuit being connected to the voltage divider circuit and the voltage follower, and being used for filtering the voltage divider signal; A fourth filtering circuit is connected to the voltage follower and the control module to filter the amplified voltage-divided signal.

19. The protection circuit according to claim 18, characterized in that: The current sampling circuit also includes: A second clamping circuit, wherein the second clamping circuit is connected to the fourth filtering circuit and the control module.

20. The protection circuit according to claim 14, characterized in that: The rotation speed sampling circuit is a resolver decoding chip, and the resolver decoding chip is connected to the control module to obtain the resolver signal.

21. The protection circuit according to claim 14, characterized in that: The intelligent power module fault detection circuit comprises: The upper bridge fault detection circuit is suitable for being connected to the upper bridge circuit of the intelligent power module and is used for performing fault detection on the upper bridge circuit to obtain upper bridge fault detection information.

22. The protection circuit according to claim 21, characterized in that: The intelligent power module fault detection circuit further includes: a fifth filtering circuit connected to the upper bridge fault detection circuit and the control module, and configured to filter the upper bridge fault detection information.

23. The protection circuit according to claim 21, characterized in that: The intelligent power module fault detection circuit also includes: The lower bridge fault detection circuit is suitable for being connected to the lower bridge circuit of the intelligent power module and is used for performing fault detection on the lower bridge circuit to obtain lower bridge fault detection information.

24. The protection circuit according to claim 23, characterized in that: 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, and configured to filter the lower bridge fault detection information.

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

26. The protection circuit according to claim 25, characterized in that: The temperature sampling circuit includes a plurality of winding temperature sampling circuits, and the plurality of winding temperature sampling circuits are connected to the control module and are used to respectively collect the temperature of each phase winding of the motor.

27. The protection circuit according to claim 25, characterized in that: The temperature sampling circuit includes a plurality of copper bar temperature sampling circuits, which are connected to the control module and are used to collect the copper bar temperature of each copper bar of the intelligent power module.

28. The protection circuit according to claim 25, characterized in that: The temperature sampling circuit includes a plurality of internal temperature sampling circuits, and the plurality of internal temperature sampling circuits are located in the intelligent power module and are used to collect temperature signals at different positions inside the intelligent power module.

29. The protection circuit according to any one of claims 14, 25-28, characterized in that: The temperature sampling circuit comprises: The in-phase proportional amplifier circuit is connected to a temperature sensor for detecting the temperature of the target component and the control module, and is used for amplification processing and sending the amplified temperature signal to the control module.

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

31. The protection circuit according to claim 30, characterized in that: The temperature sampling circuit further includes at least one of the following: A pull-up power supply circuit, wherein the pull-up power supply circuit is suitable for connecting to the temperature sensor and a preset power supply; A third clamping circuit is connected to the eighth filtering circuit and the control module.

32. A protection control method for an electric drive system, characterized in that: For the protection circuit according to any one of claims 1 to 31, the protection control method comprises: Acquiring multiple sampling signals of the electric drive system; When at least two of the plurality of sampling signals of the electric drive system are abnormal, protective measures for the electric drive system are executed.

33. The protection control method according to claim 32, characterized in that: The multiple sampling signals of the electric drive system include at least two of a bus voltage signal, a motor winding current signal, a temperature signal of a target component of the electric drive system, a resolver signal corresponding to the motor speed, and a fault detection signal of an intelligent power module.

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

35. The protection control method according to any one of claims 32 to 34, characterized in that: The executing protection measures for the electric drive system comprises: A protection control signal is sent to cut off the power supply of a circuit breaker connected between the intelligent power module of the electric drive system and the motor of the electric drive system, so that the intelligent power module is disconnected from the motor.

36. An electric drive system, characterized in that: A protection circuit comprising any one of claims 1-31.

37. The electric drive system according to claim 36, characterized in that: 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. The drive module is also connected to the control module in the protection circuit. The motor is connected to the intelligent power module via a circuit breaker in the protection circuit.

38. A vehicle, characterized in that: Includes the electric drive system as described in claim 36 or 37.

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