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 voltage conversion module, a driving chip, a control module, a high-voltage alternating-current electricity taking module and a power module, the phase current frequency detection module is used for detecting a real-time phase current frequency value of a three-phase winding of the motor in real time; the control module is used for storing a phase current frequency limit value and outputting an enable signal of the voltage conversion module; the high-voltage alternating current power taking module is used for obtaining at least one phase of alternating current in the three-phase alternating current and supplying power to the voltage conversion module; the voltage conversion module is used for receiving the voltage conversion enable signal, starting working, converting at least one phase of alternating current 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; the active short-circuit 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 in particular, 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, an active short circuit (ASC) protection technology needs to be adopted 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 rapid 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, 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 voltage conversion module, a drive chip, a control module, a high-voltage AC power acquisition module, and a power module;

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

[0006] The phase current frequency detection module is used to detect the real-time phase current frequency value 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 by the motor 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 value and the phase current frequency limit value;

[0008] The high-voltage AC power acquisition module is used to acquire at least one phase of alternating current in the three-phase alternating current and supply power to the voltage conversion module;

[0009] The voltage conversion module is used to receive the voltage conversion enable signal and start working, and convert the at least one-phase alternating current 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 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 current frequency signal required by the control module.

[0011] Optionally, the active protection control system of the motor controller further includes a transformer module, a rectification module and a voltage stabilization module. The transformer module is respectively connected to the high-voltage AC power extraction module and the rectification module. The rectifier module is connected to the voltage stabilization module, and the voltage stabilization module is connected to the voltage conversion module;

[0012] The transformer module is used to receive the at least one-phase alternating current and output a converted voltage after voltage conversion; the rectification module is used to receive the converted voltage and output a rectified voltage after rectification; the voltage stabilization module is used to receive the rectified voltage and output a stabilized voltage to the voltage conversion module after voltage stabilization.

[0013] Optionally, the voltage conversion module includes a DCDC converter, and the DCDC converter is used to receive the stabilized voltage and convert it into the working voltage required by the power module.

[0014] Optionally, the phase current frequency detection module includes a Hall sensor.

[0015] Optionally, the control module includes a single-chip microcomputer.

[0016] Optionally, the power module includes a full-bridge drive circuit;

[0017] The full-bridge drive circuit includes three upper-bridge arm transistors and three lower-bridge arm transistors;

[0018] The voltage conversion module is electrically connected to the gates of the three upper-bridge arm transistors, or the voltage conversion module is electrically connected to the three lower-bridge arm transistors.

[0019] Optionally, the phase current frequency is proportional to the motor current.

[0020] 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:

[0021] The control module obtains the real-time phase current frequency value of the three-phase windings of the motor;

[0022] The control module obtains the phase current frequency limit value generated by the motor at the three-phase windings when the motor is overspeed;

[0023] The control module determines whether the real-time phase current frequency value is greater than or equal to the phase current frequency limit value;

[0024] If so, the output voltage conversion module enables signal;

[0025] If not, the control module continues to execute the step of determining whether the real-time phase current frequency value is greater than or equal to the phase current frequency limit value;

[0026] The voltage conversion module obtains the voltage conversion module enable signal and starts to work, and obtains at least one-phase alternating current output by the high-voltage AC power-taking module, converts the at least one-phase alternating current 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 drive tube of the upper or lower bridge arm of the power module, so that the motor controller enters the active short-circuit mode.

[0027] 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.

[0028] The technical solution of the embodiment of the present invention provides an active protection control system of a motor controller through the present invention. The active protection control system of the motor controller includes a phase current frequency detection module, a voltage conversion module, a drive chip, a control module, a high-voltage AC power-taking module, and a power module; the control module is respectively connected to the phase current frequency module and the voltage conversion module; the voltage conversion module is connected to the drive chip, the high-voltage AC power-taking module, and the power module; the phase current frequency detection module is used to detect the real-time phase current frequency value 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 by the motor at the three-phase windings when the motor is overspeed, and output the voltage conversion module enable signal according to the real-time phase current frequency value and the phase current frequency limit value; the high-voltage AC power-taking module is used to obtain at least one-phase alternating current in the three-phase alternating current and supply power to the voltage conversion module; the voltage conversion module is used to receive the voltage conversion enable signal and start to work, and convert at least one-phase alternating current into the working voltage required by the power module, and output it to the fault pin of the drive chip and the gate of the drive tube of the upper or lower bridge arm of the power module, so that the motor controller enters the active short-circuit mode. Realize the active short-circuit protection of the motor in the runaway or overspeed state, and avoid the overvoltage damage of the motor controller.

[0029] It should be understood that the content described in this section 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 readily understood through the following description. Brief Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0031] Figure 1 Structural schematic diagram of an active protection control system for a motor controller provided by an embodiment of the present invention;

[0032] Figure 2 Structural schematic diagram of another active protection control system for a motor controller provided by an embodiment of the present invention;

[0033] Figure 3 Flowchart of an active protection control method for a motor controller provided by the present invention. Detailed Embodiments

[0034] In order to enable those skilled in the art to better understand the solution of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with 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 scope of protection of the present invention.

[0035] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above accompanying 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 other than 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 that includes 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.

[0036] Figure 1The figure is 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 1 shown, the active protection control system of the motor controller includes a phase current frequency detection module 101, a voltage conversion module 102, a drive chip 103, a control module 104, a high-voltage AC power acquisition module 105, and a power module 106; the control module 104 is respectively connected to the phase current frequency module and the voltage conversion module 102; the voltage conversion module 102 is connected to the drive chip 103, the high-voltage AC power acquisition module 105, and the power module 106; the phase current frequency detection module 101 is used to detect the real-time phase current frequency value of the three-phase windings of the motor in real time; the control module 104 is used to store the phase current frequency limit value generated by the motor 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 value and the phase current frequency limit value; the high-voltage AC power acquisition module 105 is used to acquire at least one phase of alternating current in the three-phase alternating current and supply power to the voltage conversion module 102; the voltage conversion module 102 is used to receive the voltage conversion enable signal and start working, and convert at least one phase of alternating current into the working voltage required by the power module 106, and output it to the fault pin of the drive chip 103 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.

[0037] Among them, the active protection control system of the motor controller includes a phase current frequency detection module 101, a voltage conversion module 102, a drive chip 103, a control module 104, a high-voltage AC power acquisition 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. Specifically, it can 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 104. The phase current frequency limit value generated at the three-phase windings when the motor is overspeed is pre-stored in the control module 104. The phase current frequency limit value 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 value can also be obtained by calculation method, calculating the phase current frequency value generated at the three-phase windings when the motor is overspeed according to information such as the number of pole pairs of the motor. The control module 104 can collect the real-time phase current frequency value output by the phase current frequency detection module 101 in real time. The control module 104 can also be used to store the phase current frequency limit value generated at the three-phase windings when the motor is overspeed and analyze 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 value, 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 102. Exemplarily, six drive chips 103 are provided in the active protection control system of the motor controller.

[0038] The high-voltage AC power acquisition module 105 can adopt a high-voltage power acquisition method to directly obtain electric energy from the high-voltage power supply part of the motor system. The high-voltage AC power acquisition module 105 can obtain single-phase alternating current, two-phase alternating current or three-phase alternating current. Specifically, the acquisition method can be selected according to actual design requirements. In the exemplary embodiment of the present invention, the high-voltage AC power acquisition module 105 obtaining two-phase alternating current is used for display. The high-voltage AC power acquisition module 105 also has a certain function of storing electric energy. The electric energy output from the high-voltage AC power acquisition module 105 will be converted by the voltage conversion module 102, and the converted voltage can supply power to the control module 104, thereby providing a stable working power supply for the control module 104. At the same time, the design of the high-voltage AC power acquisition module 105 can ensure the independent power supply of the control module 104, 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 a runaway or overspeed state. 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 AC power acquisition module 105, 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 adopt 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.

[0039] After receiving the voltage conversion enable signal output by the control module 104, the voltage conversion module 102 starts to work and converts at least one-phase alternating current received into the working voltage required by the power module 106. Exemplarily, the working voltage can be a low level. The voltage conversion module 102 also outputs a signal to the fault pin of the drive chip 103, causing some of the drive chips 103 to enter the fault mode, and the drive chip 103 outputs a low level. When the voltage conversion module 102 outputs a signal to the fault pin of the drive chip 103, if the drive chip 103 is in a failed state such as power-off at this time, the drive chip 103 has no output action at this time. Both the voltage conversion module 102 and the drive chip 103 are connected to the power module 106, and the conduction of the drive transistor in the upper bridge arm of the power module 106 can be controlled or the conduction of the drive transistor in the lower bridge arm of the power module 106 can be controlled, so that the motor controller enters the active protection mode. Exemplarily, in this application, the conduction of the drive transistor in the lower bridge arm of the power module 106 is used as an example for display. The gate of the drive transistor in the lower bridge arm of the power module 106 receives a low-voltage level, and the drive transistor in the lower bridge arm is in the conduction state, so that the motor controller enters the active short-circuit mode. When the motor controller enters the active short-circuit mode, the motor stator winding 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 motor output end, effectively suppressing the further increase of the motor speed, realizing the protection against motor runaway or overspeed, and at the same time releasing the voltage across the power module 106 to realize the protection of the motor controller.

[0040] In the embodiment of the present invention, by setting an active protection control system for a motor controller, which includes a phase current frequency detection module, a voltage conversion module, a drive chip, a control module, a high-voltage AC power-taking module, and a power module, the rapid response and effective active short-circuit protection for the motor in a runaway or overspeed state are realized, and the overvoltage damage of the motor controller is avoided.

[0041] Optionally, Figure 2 As shown in the structural schematic diagram of an active protection control system for a motor controller provided by an embodiment of the present invention, Figure 2 As shown, the phase current frequency detection module 101 includes a phase current frequency conversion unit 1011, and the phase current frequency conversion unit 1011 is used to convert the real-time phase current frequency into a current frequency signal required by the control module 104.

[0042] Among them, a phase current frequency conversion unit 1011 is further 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 104. Furthermore, the control module 104 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 and make the motor controller enter the active short-circuit mode.

[0043] Optionally, referring to Figure 1 , the active protection control system of the motor controller further includes a transformer module 107, a rectification module 108, and a voltage stabilization module 109. The transformer module 107 is respectively connected to the high-voltage AC power acquisition module 105 and the rectification module 108. The rectifier module is connected to the voltage stabilization module 109, and the voltage stabilization module 109 is connected to the voltage conversion module 102. The transformer module 107 is used to receive at least one phase of alternating current and output a converted voltage after voltage conversion. The rectification module 108 is used to receive the converted voltage and output a rectified voltage after rectification. The voltage stabilization module 109 is used to receive the rectified voltage and output a stabilized voltage to the voltage conversion module 102 after voltage stabilization.

[0044] Among them, since at least one phase of alternating current obtained by the high-voltage AC power acquisition unit cannot be directly received by the voltage conversion module 102, it is necessary to set a transformer module 107, a rectification module 108, and a voltage stabilization module 109 between the voltage conversion module 102 and the high-voltage AC power acquisition unit. Exemplarily, two phases of alternating current in the three-phase alternating current obtained by the high-voltage AC power acquisition unit will first pass through the transformer module 107 for conversion, and the converted voltage is output to the rectification module 108. The rectification module 108 rectifies the converted voltage to generate a rectified voltage and then outputs it to the voltage stabilization module 109. After the voltage stabilization module 109 stabilizes it, the stabilized voltage can reach the minimum startup voltage of the voltage conversion module 102. The voltage conversion module 102 will convert the stabilized voltage into the working voltage required by the power module 106, and then output it to the fault pin of the drive chip 103 and the gates of the drive transistors on the upper or lower bridge arms of the power module 106, so that the motor controller enters the active short-circuit mode.

[0045] Optionally, the voltage conversion module 102 includes a DCDC converter, and the DCDC converter is used to receive the stabilized voltage and convert it into the working voltage required by the power module 106.

[0046] Among them, a DCDC converter is provided in the voltage conversion module 102. The DCDC converter can convert the received regulated voltage to the operating voltage required by the power module 106, ensuring that after the motor controller enters the active short-circuit mode, it can stably remain in the active short-circuit mode for a period of time to ensure 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 conventional 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.

[0047] Optionally, the phase current frequency detection module 101 includes a Hall sensor.

[0048] Among them, the phase current frequency detection module 101 may include a Hall sensor. The Hall sensor chip has a low cost. 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. Also, it is convenient for the control module 104 to easily collect the real-time phase current frequency output by the Hall sensor.

[0049] Optionally, the control module 104 includes a single-chip microcomputer.

[0050] Among them, the control module 104 can use a small single-chip microcomputer. 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 motor speed from rising excessively and the power module 106 from being overvoltage broken down. 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 value, the control of the voltage conversion module 102, 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.

[0051] Optionally, the power module 106 includes a full-bridge drive circuit; the full-bridge drive circuit includes three upper-arm transistors and three lower-arm transistors; the voltage conversion module 102 is electrically connected to the gates of the three upper-arm transistors, or the voltage conversion module 102 is electrically connected to the three lower-arm transistors.

[0052] 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 102 is electrically connected to the gates of the three upper-arm drive tubes, and the voltage conversion module 102 is also electrically connected to the drive chip 103. When the voltage conversion module 102 receives the voltage conversion module enable signal and starts to work, it outputs to the fault pin of the drive chip 103, causing the drive chip 103 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 102 is electrically connected to the three lower-arm drive tubes, and the voltage conversion module 102 is also electrically connected to the drive chip 103. When the voltage conversion module 102 receives the voltage conversion module enable signal and starts to work, it outputs to the fault pin of the drive chip 103, causing the drive chip 103 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.

[0053] Optionally, the phase current frequency is proportional to the motor current.

[0054] 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, and its unit is rpm (revolutions per minute), 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 as the motor rotates. Thus, 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 104 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.

[0055] 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, the active protection control method of the motor controller includes:

[0056] S101, the control module obtains the real-time phase current frequency value of the three-phase windings of the motor.

[0057] Among them, the control module obtains the real-time phase current frequency value of the three-phase windings of the motor output by the phase current frequency detection module in real time.

[0058] S102, the control module obtains the phase current frequency limit value generated at the three-phase windings of the motor when the motor is overspeed.

[0059] 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.

[0060] S103, the control module judges whether the real-time phase current frequency value is greater than or equal to the phase current frequency limit value; if so, execute step S104; if not, execute step S103.

[0061] S104, output the enable signal of the voltage conversion module.

[0062] S105, the voltage conversion module obtains the enable signal of the voltage conversion module and starts to work, and obtains at least one-phase alternating current output by the high-voltage AC power-taking module, converts the at least one-phase alternating current 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 arms of the power module, so that the motor controller enters the active short-circuit mode.

[0063] In the embodiment of the present invention, the control module obtains the real-time phase current frequency value of the three-phase windings of the motor; the control module obtains the phase current frequency limit value generated at the three-phase windings of the motor when the motor is overspeed; the control module outputs the enable signal of the voltage conversion module according to the real-time phase current frequency value and the phase current frequency limit value. The voltage conversion module obtains the enable signal of the voltage conversion module and starts to work, and obtains at least one-phase alternating current output by the high-voltage AC power-taking module, converts the at least one-phase alternating current 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 lower bridge arm of the power module, so that the motor controller enters the active short-circuit mode, so that the motor controller enters the active short-circuit mode, realizing the active short-circuit protection for the motor in the runaway or overspeed state, and avoiding the overvoltage damage of 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. For the same parts, reference may be made to the description of the active protection control system of the motor controller provided in the embodiments of the present invention above, and details will not be described herein again.

[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 voltage conversion module, a drive chip, a control module, a high-voltage AC power supply module and a power module; The control module is connected to the phase current frequency module and the voltage conversion module respectively; the voltage conversion module is connected to the driving chip, the high-voltage AC power supply module and the power module; The phase current frequency detection module is used to detect the real-time phase current frequency value of the three-phase winding of the motor in real time; The control module is used to store the phase current frequency limit value generated by the motor 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 value and the phase current frequency limit value; The high-voltage AC power acquisition module is used to obtain at least one phase of the three-phase AC power and supply power to the voltage conversion module; The voltage conversion module is used to receive the voltage conversion enable signal and start working, and convert the at least one phase of AC power 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 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 current frequency signal required by the control module.

3. The active protection control system of the motor controller according to claim 1, characterized in that: The active protection control system of the motor controller also includes a transformer module, a rectifier module and a voltage stabilizing module, wherein the transformer module is respectively connected to the high-voltage AC power taking module and the rectifier module, the rectifier module is connected to the voltage stabilizing module, and the voltage stabilizing module is connected to the voltage conversion module; The transformer module is used to receive the at least one phase of alternating current, and output the converted voltage after voltage conversion; the rectifier module is used to receive the converted voltage, and output the rectified voltage after rectification; the voltage regulator module is used to receive the rectified voltage, and output the regulated voltage to the voltage conversion module after voltage regulation.

4. The active protection control system of the motor controller according to claim 3, characterized in that: The voltage conversion module includes a DCDC converter, and the DCDC converter is used to receive the regulated voltage and convert it into the operating voltage required by the power 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 transistors and three lower bridge arm transistors; The voltage conversion module is electrically connected to the gates of the three upper bridge arm transistors, or the voltage conversion module is electrically connected to the three lower bridge arm transistors.

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 value of the three-phase winding of the motor; The control module obtains the phase current frequency limit value generated by the motor at the three-phase winding when the motor is overspeeding; The control module determines whether the real-time phase current frequency value is greater than or equal to the phase current frequency limit value; 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 value is greater than or equal to the phase current frequency limit value; The voltage conversion module obtains the voltage conversion module enable signal and starts working, and obtains at least one phase of AC power output by the high-voltage AC power taking module, converts the at least one phase of AC power 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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