Active protection control system and method of motor controller and electric vehicle

Abstract

The invention discloses an active protection control system and method of a motor controller and an electric vehicle. Comprising a phase current frequency detection module, a driving chip, a control module, a voltage conversion module, a high-voltage power supply module and a power module, the phase current frequency detection module is used for detecting the real-time phase current frequency of a three-phase winding of the motor in real time; the control module is used for storing a phase current frequency limit value generated at a three-phase winding when the motor is overspeed and outputting an enable signal of the voltage conversion module; the high-voltage power supply module is used for providing high-voltage direct-current voltage for the voltage conversion module; and the voltage conversion module is used for receiving the enable signal of the voltage conversion module, starting working, converting the high-voltage direct-current voltage into working voltage required by the power module, and outputting the working voltage to a fault pin of the driving chip and a grid electrode of a driving tube of an upper bridge arm or a lower bridge arm in the power module, so that the motor controller enters an active short-circuit mode. The protection of the motor in a galloping or overspeed state is realized, and the overvoltage damage of the motor controller is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and particularly to an active protection control system and method for a motor controller and an electric vehicle. Background Art

[0002] During the operation of a motor, a phenomenon of motor runaway may occur, that is, the speed of the motor exceeds the normal operating range. When the motor runs away, it is necessary to adopt active short circuit (ASC) protection technology to prevent the power module from being broken down by overvoltage. Active short circuit protection is an important safety measure in the motor control system, which is used to protect the safety of the motor and the vehicle when the motor overspeed. However, in the prior art, it is usually necessary to determine whether to enter the short circuit protection state by means of software conditions, and at the same time rely on software control to enter the short circuit protection state. The implementation means is relatively complex, and the protection ability for extreme cases is weak. Summary of the Invention

[0003] The present invention provides an active protection control system and method for a motor controller and an electric vehicle to ensure a quick response to the phenomenon of motor runaway or overspeed, avoid overvoltage damage to the motor controller, and even when the power supply and control of the motor controller are interrupted, it can ensure that the motor controller enters the short circuit protection state, avoiding the system from outputting too high a voltage and causing personal injury and secondary damage to the electric drive system.

[0004] In a first aspect, the present invention provides an active protection control system for a motor controller. The active protection control system for the motor controller includes a phase current frequency detection module, a drive chip, a control module, a voltage conversion module, a high-voltage power supply module, and a power module;

[0005] The control module is respectively connected to the phase current frequency detection module and the high-voltage power supply module; the voltage conversion module is connected to the drive chip, the high-voltage power supply module, and the power module;

[0006] The phase current frequency detection module is used to detect the real-time phase current frequency of the three-phase windings of the motor in real time;

[0007] The control module is used to store the phase current frequency limit value generated at the three-phase windings when the motor overspeed, and output a voltage conversion module enable signal according to the real-time phase current frequency and the phase current frequency limit value;

[0008] The high-voltage power supply module is used to provide a high-voltage DC voltage to the voltage conversion module;

[0009] The voltage conversion module is used to receive the voltage conversion module enable signal and start working, and convert the high-voltage DC voltage into the working voltage required by the power module, and output it to the fault pin of the drive chip and the gates of the drive tubes of the upper or lower bridge arms of the power module, so that the motor controller enters the active short-circuit mode.

[0010] Optionally, the high-voltage power supply module includes a high-voltage DC power acquisition unit; the high-voltage DC power acquisition unit is used to obtain electrical energy from the high-voltage power supply of the motor controller; or obtain electrical energy from the capacitor of the motor controller, and the capacitor stores the motor back electromotive force.

[0011] Optionally, the voltage conversion module includes a DCDC converter, and the DCDC converter is used to convert the high-voltage DC voltage into the working voltage required by the power module.

[0012] Optionally, the phase current frequency detection module includes a phase current frequency conversion unit, and the phase current frequency conversion unit is used to convert the real-time phase current frequency into the phase current frequency signal required by the control module.

[0013] Optionally, the phase current frequency detection module includes a Hall sensor.

[0014] Optionally, the control module includes a single-chip microcomputer.

[0015] Optionally, the power module includes a full-bridge drive circuit;

[0016] The full-bridge drive circuit includes three upper-bridge-arm drive tubes and three lower-bridge-arm drive tubes;

[0017] The voltage conversion module is electrically connected to the gates of the three upper-bridge-arm drive tubes, or the voltage conversion module is electrically connected to the three lower-bridge-arm drive tubes.

[0018] Optionally, the phase current frequency is proportional to the motor current.

[0019] In a second aspect, the present invention provides an active protection control method for a motor controller, which is applied to the active protection control system of the motor controller described in any item of the first aspect. The active protection control method of the motor controller includes:

[0020] The control module acquires the real-time phase current frequency of the three-phase windings of the motor;

[0021] The control module acquires the phase current frequency limit value generated at the three-phase windings when the motor overspeed;

[0022] The control module determines whether the real-time phase current frequency is greater than or equal to the phase current frequency limit value;

[0023] If so, an output voltage conversion module enabling signal is output;

[0024] If not, continue to execute the step in the control module to determine whether the real-time phase current frequency is greater than or equal to the phase current frequency limit value;

[0025] The voltage conversion module obtains the voltage conversion module enabling signal and starts to work, and obtains the high-voltage DC voltage output by the high-voltage DC power supply module, converts the high-voltage DC voltage into the working voltage required by the power module, and outputs it to the fault pin of the drive chip and the gates of the drive tubes of the upper or lower bridge arm in the power module, so that the motor controller enters the active short-circuit mode.

[0026] In a third aspect, the present invention provides an electric vehicle, and the electric vehicle includes the active protection control system of the motor controller according to any one of the first aspects.

[0027] The technical solution of the embodiment of the present invention provides an active protection control system of a motor controller. The active protection control system of the motor controller includes a phase current frequency detection module, a drive chip, a control module, a voltage conversion module, a high-voltage power supply module, and a power module; the control module is respectively connected to the phase current frequency detection module and the high-voltage power supply module; the voltage conversion module is connected to the drive chip, the high-voltage power supply module, and the power module; the phase current frequency detection module is used to detect the real-time phase current frequency of the three-phase windings of the motor in real time; the control module is used to store the phase current frequency limit value generated at the three-phase windings when the motor runs overspeed, and output a voltage conversion module enabling signal according to the real-time phase current frequency and the phase current frequency limit value; the high-voltage power supply module is used to provide a high-voltage DC voltage for the voltage conversion module; the voltage conversion module is used to receive the voltage conversion module enabling signal and start to work, and convert the high-voltage DC voltage into the working voltage required by the power module, and output it to the fault pin of the drive chip and the gates of the drive tubes of the upper or lower bridge arm in the power module, so that the motor controller enters the active short-circuit mode. The active short-circuit protection for the motor in the flying or overspeed state is realized, and the overvoltage damage of the motor controller is avoided.

[0028] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 A schematic structural diagram of an active protection control system for a motor controller provided by an embodiment of the present invention;

[0031] Figure 2 A schematic structural diagram of an active protection control system for a motor controller provided by an embodiment of the present invention;

[0032] Figure 3 A flowchart of an active protection control method for a motor controller provided by the present invention. Detailed implementation manners

[0033] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0035] Figure 1 A schematic structural diagram of an active protection control system for a motor controller provided by an embodiment of the present invention. This embodiment is applicable to the active protection control of a motor controller. The active protection control system of the motor controller can be implemented in the form of hardware and / or software, and the active protection control system of the motor controller can be configured in an electric vehicle. As Figure 1As shown in the figure, the active protection control system of the motor controller includes a phase current frequency detection module 101, a drive chip 102, a control module 103, a voltage conversion module 104, a high-voltage power supply module 105, and a power module 106. The control module 103 is respectively connected to the phase current frequency detection module 101 and the high-voltage power supply module 105. The voltage conversion module 104 is connected to the drive chip 102, the high-voltage power supply module 105, and the power module 106. The phase current frequency detection module 101 is used to detect the real-time phase current frequency of the three-phase windings of the motor in real time. The control module 103 is used to store the phase current frequency limit generated at the three-phase windings when the motor is overspeed, and output a voltage conversion module enable signal according to the real-time phase current frequency and the phase current frequency limit. The high-voltage power supply module 105 is used to provide a high-voltage DC voltage to the voltage conversion module 104. The voltage conversion module 104 is used to receive the voltage conversion module enable signal and start working, and convert the high-voltage DC voltage into the working voltage required by the power module 106, and output it to the fault pin of the drive chip 102 and the gate of the drive tube of the upper bridge arm or the lower bridge arm in the power module 106, so that the motor controller enters the active short-circuit mode.

[0036] Among them, the active protection control system of the motor controller includes a phase current frequency detection module 101, a drive chip 102, a control module 103, a voltage conversion module 104, a high-voltage power supply module 105, and a power module 106. The phase current frequency detection module 101 detects the current frequency of the three-phase windings in real time during the operation of the motor, and collects the real-time phase current frequency, which can specifically include detecting the single-phase current frequency, two-phase current frequency, or three-phase current frequency of the motor. The phase current frequency detection module 101 can include a Hall sensor. The phase current frequency detection module 101 is connected to the control module 103. The phase current frequency limit generated at the three-phase windings when the motor is overspeed is stored in advance in the control module 103. The phase current frequency limit can be obtained by calibration method, using actual bench testing to calibrate the phase current frequency value generated at the three-phase windings when the motor is overspeed; or the phase current frequency limit can also be obtained by calculation method, according to information such as the number of pole pairs of the motor to calculate the phase current frequency value generated at the three-phase windings when the motor is overspeed. The control module 103 can collect the real-time phase current frequency value output by the phase current frequency detection module 101 in real time. The control module 103 can also be used to store the phase current frequency limit generated at the three-phase windings when the motor is overspeed and analyze and process the obtained real-time phase current frequency. When the real-time phase current frequency is greater than or equal to the phase current frequency limit, it is considered that the motor is in a runaway or overspeed state, and a voltage conversion module enable signal is correspondingly output to start the voltage conversion module 104. Exemplarily, six drive chips 103 are provided in the active protection control system of the motor controller.

[0037] The high-voltage power supply module 105 can adopt the high-voltage power-taking method to directly obtain electric energy from the high-voltage power supply part (HVDC) of the motor system, that is, the back electromotive force generated during the rotation of the motor charges the capacitor in the motor controller, and then the electric energy is stored, which is convenient for the high-voltage power supply module 105 to take power from the capacitor. When the motor is in the overspeed state, power is taken from the back electromotive force of the motor to make the specified drive tube conduct, and the motor controller enters the active protection mode. The high-voltage power supply module 105 can provide a high-voltage DC voltage to the voltage conversion module 104, thereby ensuring that the motor controller enters the active short-circuit mode. At the same time, the high-voltage power supply module 105 can also supply power to the control module 103 to ensure the stable operation of the control module 103. The design of the high-voltage power supply module 105 can ensure the independent power supply of the control module 103, making it unaffected by the fluctuations of the main power supply of the motor system, and ensuring stable operation even when the motor is in the runaway or overspeed state.

[0038] After receiving the voltage conversion module enable signal output by the control module 103, the voltage conversion module 104 starts to work, converts the received high-voltage DC voltage into the working voltage required by the power module 106. Exemplarily, the working voltage can be a low level. The voltage conversion module 104 also outputs a signal to the fault pin of the drive chip 102, causing some drive chips 102 to enter the fault mode, and the drive chip 102 outputs a low level. If the voltage conversion module 104 outputs a signal to the fault pin of the drive chip 102, and at this time the drive chip 102 is in a failure state such as power-off, the drive chip 102 has no output action at this time. Both the voltage conversion module 104 and the drive chip 102 are connected to the power module 106. By controlling the conduction of the drive tube on the upper bridge arm or the drive tube on the lower bridge arm of the power module 106, the motor controller can enter the active protection mode. Exemplarily, in this application, the conduction of the drive tube on the lower bridge arm of the power module 106 is taken as an example for display. The gate of the drive tube on the lower bridge arm of the power module 106 receives a low-voltage level, and the drive tube on the lower bridge arm is in the conduction state, thereby causing the motor controller to enter the active short-circuit mode. After the motor controller enters the active short-circuit mode, the stator winding of the motor and the lower bridge arm of the power module 106 form a closed-loop circuit, and the back electromotive force energy generated by the motor is released through the stator winding, thereby generating a braking torque at the output end of the motor, effectively suppressing the further increase of the motor speed, realizing the protection of the motor against runaway or overspeed, and at the same time releasing the voltage across the power module 106 to realize the protection of the motor controller.

[0039] The embodiment of the present invention realizes the fast response and effective active short-circuit protection for the motor in the runaway or overspeed state by setting an active protection control system for the motor controller, including a phase current frequency detection module, a voltage conversion module, a drive chip, a control module, a high-voltage power supply module and a power module, and avoids overvoltage damage to the motor controller.

[0040] Optionally, Figure 2 is a schematic structural diagram of an active protection control system for a motor controller provided by an embodiment of the present invention. As Figure 2 shown, the high-voltage power supply module 105 includes a high-voltage DC power acquisition unit 1051; the high-voltage DC power acquisition unit 1051 is used to obtain electrical energy from the high-voltage power supply of the motor controller; or obtain electrical energy from the capacitor of the motor controller, and the capacitor stores the motor back electromotive force.

[0041] Among them, the high-voltage power supply module 105 includes a high-voltage DC power acquisition unit 1051. The high-voltage DC power acquisition unit 1051 can directly obtain high-voltage DC electrical energy from the high-voltage power supply of the motor controller. Or when there is no electrical energy remaining in the DC voltage bus of the high-voltage power supply, the back electromotive force generated during the rotation of the motor will charge the capacitor in the motor controller, and the motor back electromotive force stored in the capacitor can be extracted by the high-voltage DC power acquisition unit, and then supply power to the voltage conversion module 104, and can also supply power to the control module 103. By directly taking power from the high-voltage side through the high-voltage power supply module 105, the dependence conditions for protection actions are reduced, and the reliability and safety are higher. The active protection control system of the motor controller also includes a high-voltage side protection circuit and a low-voltage side control circuit. Electrical isolation needs to be achieved between the high-voltage DC power acquisition unit 1051, the high-voltage side protection circuit and the low-voltage side control circuit to ensure that the low-voltage side control circuit is not affected under abnormal high-voltage conditions and improve the overall safety of the system. The method of achieving isolation can use devices such as optocouplers, magnetic couplers or digital isolation chips to ensure the reliability of control signal transmission and the safety of personnel and equipment. The independent design of the high- and low-voltage side protection mechanisms enhances the system's fault isolation ability and overall safety, ensuring that the motor and the power module 106 can be effectively protected from damage under abnormal conditions.

[0042] Optionally, the voltage conversion module 104 includes a DCDC converter, and the DCDC converter is used to convert the high-voltage DC voltage into the working voltage required by the power module 106.

[0043] Among them, a DCDC converter is provided in the voltage conversion module 104. The DCDC converter can convert the received high-voltage DC voltage to the working voltage required by the power module 106, ensuring that after the motor controller enters the active short-circuit mode, it can stably maintain in the active short-circuit mode for a period of time, ensuring the control effect on the motor. This holding time can be designed as the time when the junction temperature of the power module 106 overheats in the active short-circuit mode under normal cooling conditions. The DCDC converter includes a DCDC conversion circuit, and there are various mature circuit topologies for the DCDC conversion circuit, such as the BUCK buck circuit topology, the flyback circuit topology, etc., all of which can achieve the functions of the present invention.

[0044] Optionally, the phase current frequency detection module 101 includes a phase current frequency conversion unit 1011, which is configured to convert the real-time phase current frequency into a phase current frequency signal required by the control module 103.

[0045] Among them, the phase current frequency conversion unit 1011 is also provided in the phase current frequency detection module 101, which can convert the detected real-time phase current frequency value, so that the converted phase current frequency signal can be received by the control module 103. Furthermore, the control module 103 can receive the converted phase current frequency signal, and then analyze and process it according to the phase current frequency signal and the phase current frequency limit value. When the phase current frequency signal is greater than the phase current frequency limit value, a voltage conversion module enable signal is correspondingly output to achieve fast response, so that the motor controller enters the active short-circuit mode.

[0046] Optionally, the phase current frequency detection module 101 includes a Hall sensor.

[0047] Among them, the phase current frequency detection module 101 may include a Hall sensor. The cost of the Hall sensor chip is low. The active protection control system of the motor controller only needs to obtain the frequency signal of the current without the need for an accurate current value, and the design is relatively simple, reducing the assembly difficulty. Moreover, it is convenient for the control module 103 to easily collect the real-time phase current frequency output by the Hall sensor.

[0048] Optionally, the control module 103 includes a single-chip microcomputer.

[0049] Among them, a small single-chip microcomputer can be used for the control module 103. Using the single-chip microcomputer as the processor of the active protection control system of the motor controller can reduce the hardware cost while meeting the functional requirements. Using the single-chip microcomputer to directly trigger the active circuit protection of the motor controller does not require the main control chip to be connected, which can ensure the response speed and can quickly connect when the motor is in a runaway or overspeed state, effectively preventing the excessive increase of the electrode speed and the overvoltage breakdown of the power module 106. It can also simplify the software condition judgment and control process, reduce the overall cost, and improve the performance-price ratio and market competitiveness of the motor controller protection. The single-chip microcomputer should have sufficient processing power to real-time process tasks such as the input real-time phase current frequency, the control of the voltage conversion module 104, and the execution of the motor controller entering the active short-circuit mode, and at the same time have good anti-interference ability and working stability.

[0050] Optionally, the power module 106 includes a full-bridge drive circuit; the full-bridge drive circuit includes three upper-arm drive tubes and three lower-arm drive tubes; the voltage conversion module 104 is electrically connected to the gates of the three upper-arm drive tubes, or the voltage conversion module 104 is electrically connected to the three lower-arm drive tubes.

[0051] Among them, the power module 106 is electrically connected to the motor and is used to supply power to the motor. The power module 106 may include a full-bridge drive circuit composed of six drive tubes. The full-bridge drive circuit includes three upper-arm drive tubes and three lower-arm drive tubes; the voltage conversion module 104 is electrically connected to the gates of the three upper-arm drive tubes, and the voltage conversion module 104 is also electrically connected to the drive chip 102. When the voltage conversion module 104 receives the voltage conversion module enable signal and starts to work, it outputs to the fault pin of the drive chip 102, causing the drive chip 102 to enter the fault mode, and outputs a signal to the gates of the upper-arm drive tubes in the power module 106, so that the motor controller enters the active short-circuit mode. Alternatively, the voltage conversion module 104 is electrically connected to the three lower-arm drive tubes, and the voltage conversion module 104 is also electrically connected to the drive chip 102. When the voltage conversion module 104 receives the voltage conversion module enable signal and starts to work, it outputs to the fault pin of the drive chip 102, causing the drive chip 102 to enter the fault mode, and outputs a signal to the gates of the upper-arm drive tubes in the power module 106, so that the motor controller enters the active short-circuit mode.

[0052] Optionally, the phase current frequency is proportional to the motor current.

[0053] Among them, the phase current frequency and the motor current satisfy the corresponding relationship I(f)∝4.44*N*f*Φ / Z, where I(f) is the motor current when the phase current frequency is f, N is the number of turns of the stator winding, Φ is the magnetic flux, and Z is the impedance. Assuming that the motor speed is n, its unit is rpm (revolutions per minute), and the corresponding speed per minute is f = n / 60. f can be understood as the phase current frequency or the speed. The dimensions of the two are the same. 1 revolution per minute is equal to 1 / 60 revolutions per second, and 1 revolution per second is equal to 1 hertz. The motor current changes with the rotation of the motor. Furthermore, the number of turns the motor rotates per unit time can be obtained based on the motor current, and then the phase current frequency f can be obtained. Since the phase current frequency can reflect the motor speed, the motor speed is also proportional to the motor back electromotive force and satisfies the formula BEMF = K*ω. BEMF represents the motor back electromotive force, K is the motor constant, which is related to the number of pole pairs, magnetic flux, number of turns, etc. of the motor, and is also related to the control method of the motor controller. ω represents the angular velocity, ω = 2π*f. When the real-time phase current frequency is greater than the phase current frequency limit value, at this time, the control module 103 considers that the motor speed is too high, the generated motor back electromotive force is large, and the motor is in a runaway or overspeed state.

[0054] Based on the same inventive concept, the present invention also provides an active protection control method for a motor controller, which is applied to the active protection control system of the motor controller described in any one of the above embodiments. Figure 3 It is a flowchart of an active protection control method for a motor controller provided by the present invention, as Figure 3As shown in the figure, the active protection control method of the motor controller includes:

[0055] S101, the control module obtains the real-time phase current frequency of the three-phase windings of the motor.

[0056] Among them, the control module obtains the real-time phase current frequency of the three-phase windings of the motor output by the phase current frequency detection module in real time.

[0057] S102, the control module obtains the phase current frequency limit value generated at the three-phase windings when the motor is overspeed.

[0058] Among them, the phase current frequency limit value generated at the three-phase windings when the motor is overspeed is stored in advance in the control module. The phase current frequency limit value is the phase current frequency value generated at the three-phase windings when the motor is overspeed, which is convenient for the subsequent control module to judge the operating state of the motor according to the real-time phase current frequency value and the phase current frequency value of the three-phase windings of the motor.

[0059] S103, the control module judges whether the real-time phase current frequency is greater than or equal to the phase current frequency limit value; if so, execute step S104; if not, execute step S103.

[0060] S104, output the enable signal of the voltage conversion module.

[0061] S105, the voltage conversion module obtains the enable signal of the voltage conversion module and starts to work, and obtains the high-voltage DC voltage output by the high-voltage DC power taking module, converts the high-voltage DC voltage into the working voltage required by the power module, and outputs it to the fault pin of the drive chip and the gate of the driving tube of the upper bridge arm or the lower bridge arm of the power module, so that the motor controller enters the active short-circuit mode.

[0062] Among them, when the control module judges that the real-time phase current frequency of the three-phase windings of the motor is greater than or equal to the phase current frequency limit value, it is considered that the current motor is in a runaway or overspeed state. Then, an enable signal is sent to the output voltage conversion module and received by the voltage conversion module. The voltage conversion module starts to work, converts the DC voltage output by the high-voltage DC power taking module to provide the required working voltage for the power module, and outputs it to the fault pin of the drive chip, so that the drive chip outputs a low level and outputs it to the gate of the driving tube of the upper bridge arm or the lower bridge arm of the power module, so that the upper bridge arm conducts or the lower bridge arm conducts, so that the motor controller enters the active short-circuit mode, avoiding further increase of the motor speed and realizing the protection of the motor controller.

[0063] In an embodiment of the present invention, a control module is used to obtain the real-time phase current frequency of the three-phase windings of the motor; the control module obtains the phase current frequency limit generated at the three-phase windings when the motor runs overspeed; the control module outputs an enable signal for a voltage conversion module according to the real-time phase current frequency and the phase current frequency limit. The voltage conversion module obtains the enable signal for the voltage conversion module and starts to work, and obtains the DC voltage output by a high-voltage DC power-taking module, converts the DC voltage into the working voltage required by a power module, and outputs it to the fault pin of a drive chip and the gates of the drive tubes of the upper or lower bridge arm of the power module, so that the motor controller enters an active short-circuit mode, realizing active short-circuit protection for the motor in a runaway or overspeed state, and avoiding overvoltage damage to the motor controller.

[0064] Based on the same inventive concept, an embodiment of the present invention further provides an electric vehicle, which includes the technical features of the active protection control system of the motor controller provided in any embodiment of the present invention, and can achieve the beneficial effects of the active protection control system of the motor controller provided in any embodiment of the present invention. The same parts can refer to the description of the active protection control system of the motor controller provided in the embodiments of the present invention above, and will not be repeated here.

[0065] The above specific embodiments do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An active protection control system for a motor controller, characterized in that: The active protection control system of the motor controller includes a phase current frequency detection module, a drive chip, a control module, a voltage conversion module, a high-voltage power supply module and a power module; The control module is connected to the phase current frequency detection module and the high-voltage power supply module respectively; the voltage conversion module is connected to the driving chip, the high-voltage power supply module and the power module; The phase current frequency detection module is used to detect the real-time phase current frequency of the three-phase winding of the motor in real time; The control module is used to store the phase current frequency limit generated at the three-phase winding when the motor is overspeeding, and output a voltage conversion module enable signal according to the real-time phase current frequency and the phase current frequency limit; The high-voltage power supply module is used to provide a high-voltage DC voltage to the voltage conversion module; The voltage conversion module is used to receive the voltage conversion module enable signal and start working, and convert the high-voltage DC voltage into the working voltage required by the power module, and output it to the fault pin of the driver chip and the gate of the driver tube of the upper bridge arm or the lower bridge arm in the power module, so that the motor controller enters the active short-circuit mode.

2. The active protection control system of the motor controller according to claim 1, characterized in that: The high-voltage power supply module includes a high-voltage direct current power supply unit; the high-voltage direct current power supply unit is used to obtain electrical energy from the high-voltage power supply of the motor controller; or to obtain electrical energy from the capacitor of the motor controller, and the capacitor stores the motor back electromotive force.

3. The active protection control system of the motor controller according to claim 1, characterized in that: The voltage conversion module includes a DCDC converter, and the DCDC converter is used to convert the high-voltage direct current voltage into the operating voltage required by the power module.

4. The active protection control system of the motor controller according to claim 1, characterized in that: The phase current frequency detection module comprises a phase current frequency conversion unit, and the phase current frequency conversion unit is used to convert the real-time phase current frequency into a phase current frequency signal required by the control module.

5. The active protection control system of the motor controller according to claim 1, characterized in that: The phase current frequency detection module includes a Hall sensor.

6. The active protection control system of the motor controller according to claim 1, characterized in that: The control module includes a single chip microcomputer.

7. The active protection control system of the motor controller according to claim 1, characterized in that: The power module includes a full-bridge drive circuit; The full-bridge drive circuit includes three upper bridge arm drive tubes and three lower bridge arm drive tubes; The voltage conversion module is electrically connected to the gates of the three upper bridge arm driving tubes, or the voltage conversion module is electrically connected to the three lower bridge arm driving tubes.

8. The active protection control system of the motor controller according to claim 1, characterized in that: The phase current frequency is proportional to the motor current.

9. An active protection control method for a motor controller, characterized in that: An active protection control system for a motor controller according to any one of claims 1 to 8, wherein the active protection control method for the motor controller comprises: The control module obtains the real-time phase current frequency of the three-phase winding of the motor; The control module obtains the phase current frequency limit value generated at the three-phase winding when the motor is overspeeding; The control module determines whether the real-time phase current frequency is greater than or equal to the phase current frequency limit; If yes, then the output voltage conversion module enables the signal; If not, continue to execute the step of the control module determining whether the real-time phase current frequency is greater than or equal to the phase current frequency limit; The voltage conversion module obtains the voltage conversion module enable signal and starts working, and obtains the high-voltage DC voltage output by the high-voltage DC power supply module, converts the high-voltage DC voltage into the working voltage required by the power module, and outputs it to the fault pin of the driver chip and the gate of the driver tube of the upper bridge arm or the lower bridge arm in the power module, so that the motor controller enters the active short-circuit mode.

10. An electric vehicle, characterized in that: The electric vehicle comprises an active protection control system of a motor controller according to any one of claims 1-8.

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