CN116054684A - Motor control circuit and method and motor driving system - Google Patents

Abstract

The present application provides a motor control circuit and method, and a motor drive system, which relate to the technical field of control circuits. The circuit includes: a first power supply channel, a second power supply channel, a power supply selection logic circuit, a first voltage conversion circuit, a digital control chip, The second voltage conversion circuit, the digital logic chip and the PWM conditioning circuit; the first voltage conversion circuit is connected with the digital control chip, and the digital control chip is respectively connected with the digital logic chip and the PWM conditioning circuit; the second voltage conversion circuit is connected with the digital logic chip, The digital logic chip is connected with the PWM conditioning circuit. The invention can drive the motor through the control circuit path based on the digital control chip or the control circuit path based on the digital logic chip, so as to ensure the continuous control of the motor by the motor control circuit, reduce the failure rate of the control system, and improve the reliability of the drive system.

Description

Motor control circuit and method, motor drive system

technical field

The invention relates to the field of control circuits, in particular to a motor control circuit and method, and a motor drive system.

Background technique

This section is intended to provide a background or context to embodiments of the invention that are recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section.

Electric aircraft puts forward higher requirements on the reliability of the motor drive system design. In order to improve the reliability of the motor drive system, the existing scheme 1 uses highly reliable devices to construct a single control channel, and some applications of electric aircraft require the system failure rate to be 10^-9 power, and the single channel design has extremely high requirements on the reliability of each device High; the existing scheme 2 uses multiple control boards to construct redundant control channels, and the use of multiple control boards brings additional volume space and weight requirements, and the simple use of multiple control boards will have the problem of common cause failure, that is, Under the same application conditions in the same environment, there is also the possibility of failure at the same time. At present, it is urgent to propose a more perfect solution for the application of the motor control circuit with high reliability, low cost, small space volume and light weight in the field of electric drive system of electric aircraft.

Contents of the invention

The present application provides a motor control circuit and method, and a motor drive system. The circuit includes redundant circuits with different physical mechanisms, which can greatly reduce the failure rate of the controller control circuit and improve the reliability of the entire drive system.

According to one aspect of the present application, a motor control circuit is provided, including: a first power supply channel, a second power supply channel, a power supply selection logic circuit, a first voltage conversion circuit, a digital control chip, a second voltage conversion circuit, a digital logic circuit chip and PWM conditioning circuit; the first voltage conversion circuit is connected to the digital control chip, and the digital control chip is respectively connected to the digital logic chip and the PWM conditioning circuit; the second voltage conversion circuit is connected to the The digital logic chip is connected, the digital logic chip is connected with the PWM conditioning circuit; the power supply selection logic circuit is used to control the first power supply channel to be the first voltage conversion circuit or the second voltage conversion circuit Circuit power supply; the power supply selection logic circuit is also used to control the second power supply channel to supply power to the first voltage conversion circuit or the second voltage conversion circuit.

According to another aspect of the present application, a motor control method is provided, the motor control method is applied to the above-mentioned motor control circuit, and the method includes: acquiring a motor control feedback signal; the motor control feedback signal is a first control A feedback signal or a second control feedback signal; using the motor control circuit to generate a motor driving signal; using the motor driving signal to control the motor.

According to another aspect of the present application, a motor drive system is provided, wherein the motor drive system includes a motor and the motor control circuit described above.

In the embodiment of the present application, the motor control circuit includes: a first power supply channel, a second power supply channel, a power supply selection logic circuit, a first voltage conversion circuit, a digital control chip, a second voltage conversion circuit, a digital logic chip and a PWM conditioning circuit The power supply selection logic circuit is used to control the first power supply channel to supply power to the first voltage conversion circuit or the second voltage conversion circuit; the power supply selection logic circuit is also used to control the second voltage conversion circuit The power supply channel supplies power to the first voltage conversion circuit or the second voltage conversion circuit; the first voltage conversion circuit is connected to the digital control chip, and the digital control chip is respectively connected to the digital logic chip and the The PWM conditioning circuit is connected; the second voltage conversion circuit is connected to the digital logic chip, and the digital logic chip is connected to the PWM conditioning circuit. In the embodiment of the present invention, the power supply selection logic circuit can control and switch the first power supply channel or the second power supply channel to supply power to the first voltage conversion circuit and/or the second voltage conversion circuit when the power supply fails, so as to avoid problems caused by the power supply channel, resulting in circuit failure. In addition, the first power supply channel, the first voltage conversion circuit, the digital control chip, and the PWM conditioning circuit form a control circuit path based on the digital control chip; the second power supply channel, the second voltage conversion circuit, the digital logic chip, and the PWM conditioning circuit form a circuit based on The control circuit path of the digital logic chip, the embodiment of the present invention can also drive the motor through the control circuit path based on the digital control chip or the control circuit path based on the digital logic chip, so as to ensure the continuous control of the motor by the motor control circuit and reduce the cost of the control system. The failure rate and improve the reliability of the drive system.

Description of drawings

Further details, features and advantages of the application are disclosed in the following description of exemplary embodiments with reference to the accompanying drawings in which:

Fig. 1 shows a schematic structural diagram of a motor control circuit according to an exemplary embodiment of the present application;

Fig. 2 shows a schematic structural diagram of a motor control circuit;

FIG. 3 shows a structural diagram of a motor control circuit according to an exemplary embodiment of the present application;

Fig. 4 shows a structure diagram of a motor control circuit under no fault conditions according to an exemplary embodiment of the present application;

Fig. 5 shows a structure diagram 1 of a motor control circuit under a fault condition according to an exemplary embodiment of the present application;

Fig. 6 shows the structure diagram 2 of the motor control circuit under the fault condition according to the exemplary embodiment of the present application.

Detailed ways

Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present application are shown in the drawings, it should be understood that the application may be embodied in various forms and should not be construed as limited to the embodiments set forth herein; A more thorough and complete understanding of the application. It should be understood that the drawings and embodiments of the present application are for exemplary purposes only, and are not intended to limit the protection scope of the present application.

It should be understood that the various steps described in the method implementations of the present application may be executed in different orders, and/or executed in parallel. Additionally, method embodiments may include additional steps and/or omit performing illustrated steps. The scope of the application is not limited in this regard.

As used herein, the term "comprise" and its variations are open-ended, ie "including but not limited to". The term "based on" is "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one further embodiment"; the term "some embodiments" means "at least some embodiments." Relevant definitions of other terms will be given in the description below. It should be noted that concepts such as "first" and "second" mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the sequence of functions performed by these devices, modules or units or interdependence.

It should be noted that the modifications of "one" and "multiple" mentioned in this application are illustrative and not restrictive. Those skilled in the art should understand that unless the context clearly indicates otherwise, it should be understood as "one or more" multiple".

The names of messages or information exchanged between multiple devices in the embodiments of the present application are used for illustrative purposes only, and are not used to limit the scope of these messages or information.

Generally, the design of high-speed motor control circuit can adopt the circuit shown in Figure 2, from left to right: control the low-voltage power supply (24V or 28V), and generate 3.3V or 5V through the voltage conversion circuit, which is MCU (Microcontroller Unit, micro control unit) / DSP (Digital Signal Processing, Digital Signal Processor), FPGA (Field Programmable Gate Array, Field Programmable Logic Gate Array)/ASIC (Application Specific Integrated Circuit, Application Specific Integrated Circuit) chip power supply, FPGA/ASIC circuit obtains high-speed analog-to-digital conversion acquisition The circuit, voltage and speed signals are transmitted to the MCU/DSP to perform control calculations; the control modulation waves calculated in the MCU/DSP are then transmitted to the FPGA/ASIC to generate PWM (Pulse Width Modulation, pulse width modulation) high and low level signals, and then A PWM driving signal that satisfies the driving level of the power unit is generated through the PWM conditioning circuit. The MCU/DSP completes the control logic calculation and communication functions, and the FPGA/ASIC chip completes the functions of data acquisition and PWM generation in parallel, thus realizing the functions of high-speed signal acquisition and calculation. In the case of no fault in the circuit, the circuit in Figure 2 can work very well, and by selecting devices with low failure rate, it can achieve a certain degree of high reliability index.

On the basis of this circuit, this application aims at the application of a motor control circuit with high reliability, low cost and small space requirement in the field of electric drive system of electric aircraft, and provides a motor control circuit and method, and a motor drive system. The circuit is A highly reliable redundant circuit design based on different physical mechanisms can further reduce the failure rate of the entire control circuit, thereby improving the reliability of the entire electric drive system to meet the high reliability requirements of electric aircraft for the electric drive system.

According to an aspect of an embodiment of the present invention, a motor control circuit is provided. FIG. 1 is a schematic structural diagram of a motor control circuit provided by an embodiment of the present invention. As shown in FIG. 1 , the circuit includes the following structure:

The first power supply channel, the second power supply channel, the power supply selection logic circuit, the first voltage conversion circuit, the digital control chip, the second voltage conversion circuit, the digital logic chip and the PWM conditioning circuit; the first voltage conversion circuit and the digital The control chip is connected, and the digital control chip is respectively connected with the digital logic chip and the PWM conditioning circuit; the second voltage conversion circuit is connected with the digital logic chip, and the digital logic chip is connected with the PWM conditioning circuit connection; the power supply selection logic circuit is used to control the first power supply channel to supply power to the first voltage conversion circuit or the second voltage conversion circuit; the power supply selection logic circuit is also used to control the first voltage conversion circuit The two power supply channels supply power to the first voltage conversion circuit or the second voltage conversion circuit.

In the embodiment of the present invention, the first power supply channel may be a low-voltage power supply channel, and the second power supply channel may also be a low-voltage power supply channel. Both the first power supply channel and the second power supply channel are connected to the power supply selection logic circuit, and the power supply selection logic circuit can be used to select whether to use the first power supply channel or the second power supply channel to supply power to the motor control circuit. Dual-control low-voltage power supply is adopted. When there is a problem with one power supply channel, the second channel is immediately selected to supply power to the control circuit.

The first voltage conversion circuit is connected with the digital control chip, the first voltage conversion circuit can be used to convert the obtained voltage into the voltage level value required by the digital control chip, and supply power to the digital control chip; the second voltage conversion circuit and the digital logic The chip is connected, and the second voltage conversion circuit can be used to convert the obtained voltage into a voltage level value required by the digital logic chip to supply power to the digital logic chip.

The digital control chip is respectively connected with the digital logic chip and the PWM conditioning circuit, so that when the path is formed, it sends a signal to the digital logic chip or the PWM conditioning circuit, and the digital logic chip is connected with the PWM conditioning circuit, so that when the path is formed, it sends a signal to the PWM conditioning circuit. Send a signal. The PWM conditioning circuit is used to generate a drive signal by using the received signal, and then use the drive signal to control the operation of the motor.

The first power supply channel, the first voltage conversion circuit, the digital control chip, and the PWM conditioning circuit are control circuit paths based on the digital control chip; the second power supply channel, the second voltage conversion circuit, the digital logic chip, and the PWM conditioning circuit are based on digital logic. The control circuit path of the chip.

When the control circuit path based on the digital logic chip fails, at this time, the first power supply channel, the first voltage conversion circuit, the digital control chip and the PWM conditioning circuit are the control circuit path based on the digital control chip, and control the operation of the motor; When the control circuit path based on the digital control chip fails, the second power supply channel, the second voltage conversion circuit, the digital logic chip and the PWM conditioning circuit are the control circuit paths based on the digital logic chip to control the operation of the motor; Next, the first power supply channel and the second power supply channel are controlled by the power supply selection logic circuit to supply power to each device in the entire motor control circuit, and each device in the entire motor control circuit forms a motor control circuit to control the continuous operation of the motor.

In the embodiment of the present application, the motor control circuit includes: a first power supply channel, a second power supply channel, a power supply selection logic circuit, a first voltage conversion circuit, a digital control chip, a second voltage conversion circuit, a digital logic chip and a PWM conditioning circuit The power supply selection logic circuit is used to control the first power supply channel to supply power to the first voltage conversion circuit or the second voltage conversion circuit; the power supply selection logic circuit is also used to control the second voltage conversion circuit The power supply channel supplies power to the first voltage conversion circuit or the second voltage conversion circuit; the first voltage conversion circuit is connected to the digital control chip, and the digital control chip is respectively connected to the digital logic chip and the The PWM conditioning circuit is connected; the second voltage conversion circuit is connected to the digital logic chip, and the digital logic chip is connected to the PWM conditioning circuit. In the embodiment of the present invention, the power supply selection logic circuit can control and switch the first power supply channel or the second power supply channel to supply power to the first voltage conversion circuit and/or the second voltage conversion circuit when the power supply fails, so as to avoid problems caused by the power supply channel, resulting in circuit failure. In addition, the first power supply channel, the first voltage conversion circuit, the digital control chip, and the PWM conditioning circuit form a control circuit path based on the digital control chip; the second power supply channel, the second voltage conversion circuit, the digital logic chip, and the PWM conditioning circuit form a circuit based on The control circuit path of the digital logic chip, the embodiment of the present invention can also drive the motor through the control circuit path based on the digital control chip or the control circuit path based on the digital logic chip, so as to ensure the continuous control of the motor by the motor control circuit and reduce the cost of the control system. The failure rate and improve the reliability of the drive system.

In an optional implementation manner, when the first power supply channel supplies power to the first voltage conversion circuit through the power supply selection logic circuit, and the second power supply channel supplies power to the first voltage conversion circuit through the power supply selection logic circuit When the second voltage conversion circuit supplies power, the digital logic chip is used to obtain a first control feedback signal by using an analog-to-digital conversion circuit, and send the first control feedback signal to the digital control chip; the digital control The chip is configured to receive the first control feedback signal, calculate and generate a control modulation wave according to the first control feedback signal, and send the control modulation wave to the digital logic chip; the digital logic chip also uses Generate PWM high and low level signals according to the control modulation wave, and send the PWM high and low level signals to the PWM conditioning circuit; the PWM conditioning circuit is used to generate motor drive signals according to the PWM high and low level signals .

In the embodiment of the present invention, the digital logic chip can use a high-speed analog-to-digital conversion circuit to obtain the first control feedback signal from the sensor. Optionally, the first control feedback signal is one or more of the following signals: current signal, voltage signal, speed signal and temperature signal. Optionally, the digital control chip is a micro control unit or a digital signal processor; the digital logic chip is a field programmable logic gate array or an application specific integrated circuit.

It should be noted that the circuit structure can be realized according to the motor control circuit structure diagram shown in FIG. 3 . Dual external low-voltage power supply (can be 24V or 28V), the conventional working circuit path is low-voltage power supply-voltage conversion circuit-MCU/DSP-FPGA/ASIC-PWM conditioning circuit-output drive signal, when the circuit on this path occurs When a fault occurs, the redundant circuit path is selected depending on the specific fault circuit. The redundant circuit path includes: (1) The control circuit path based on the digital logic chip: low-voltage power supply-voltage conversion circuit-FPGA/ASIC-PWM conditioning circuit-drive signal; Or (2) The control circuit path based on the digital control chip: low-voltage power supply-voltage conversion circuit-MCU/DSP-PWM conditioning circuit-drive signal; this provides redundant motor control circuit design based on different physical mechanisms. The circuit also has a high-speed analog-to-digital conversion circuit, which is suitable for high-reliability high-speed motor control circuits.

In the embodiment of the present invention, based on the circuit shown in FIG. 3, in the normal working mode, refer to the structure diagram of the motor control circuit shown in FIG. 4 under the condition of no fault, to provide an independent power supply system for MCU/DSP, FPGA/ASIC chips : Control the low-voltage power supply channel 1, convert the voltage to 3.3V through the voltage conversion circuit 1, and provide power for the MCU/DSP chip; control the low-voltage power supply channel 2, and convert the voltage to 3.3V/5V through the voltage conversion circuit 2 for FPGA /ASIC chip provides power supply. The FPGA/ASIC circuit obtains the circuit, voltage, speed and temperature signals collected by high-speed analog-to-digital conversion, and transmits them to the MCU/DSP chip for control calculation; the control modulation wave calculated in the MCU/DSP chip is then transmitted to the FPGA/ASIC chip for generation The PWM high and low level signals are then passed through the PWM conditioning circuit to generate a PWM drive signal that meets the drive level of the power unit. The MCU/DSP chip completes the control logic calculation and communication functions, and the FPGA/ASIC chip completes the functions of data acquisition and PWM generation in parallel. In this mode, a separate power supply circuit for FPGA/ASIC is provided.

In order to avoid failure of the motor control circuit due to power supply failure, the power supply selection logic circuit detects the power supply levels of the first voltage conversion circuit and the second voltage conversion circuit, and if one of the power supply channels fails, the other power supply channel is controlled to convert the first voltage The circuit and or the second voltage conversion circuit are powered. Therefore, in an optional implementation manner, the power supply selection logic circuit is configured to: detect the power supply levels of the first voltage conversion circuit and the second voltage conversion circuit, and determine the power supply level of the first voltage conversion circuit according to the power supply level The operating status of the power supply channel and the second power supply channel; if the first power supply channel fails, control the second power supply channel to replace the first power supply channel; if the second power supply channel fails, control the The first power supply channel replaces the second power supply channel.

In the embodiment of the present invention, the power supply selection logic circuit detects the power supply levels of the first voltage conversion circuit and the second voltage conversion circuit in real time, and judges the operating status of the first power supply channel and the second power supply channel according to the detection results. If the operation state is that the first power supply channel is faulty, then control the second power supply channel to replace the first power supply channel to realize switching of the power supply channel; if the operation state is that the second power supply channel is faulty, then control the first power supply channel The second power supply channel is replaced to realize switching of the power supply channel.

In an optional implementation manner, when the digital logic chip-based control circuit path composed of the second power supply channel, the second voltage conversion circuit, the digital logic chip, and the PWM conditioning circuit fails, The digital control chip is used to obtain a second control feedback signal, calculate and generate PWM high and low level signals according to the second control feedback signal, and send the PWM high and low level signals to the PWM conditioning circuit; The PWM conditioning circuit is used to generate a motor driving signal according to the PWM high and low level signals.

In the embodiment of the present invention, the digital control chip is a micro control unit or a digital signal processor; the digital logic chip is a field programmable logic gate array or an application specific integrated circuit. In specific implementation, the circuit structure can be realized according to the motor control circuit structure diagram shown in FIG. 3 . Based on the circuit shown in Figure 3, based on the circuit failure of the FPGA/ASIC chip, refer to the structure diagram 2 of the motor control circuit in the case of a fault shown in Figure 6. At this time, the motor control is independently provided by the DSP/MCU chip circuit to control the low-voltage power supply. The power-on can be channel 1 or channel 2, which is determined by the power supply selection logic circuit detecting the power supply level. At this time, the DSP/MCU chip needs to directly collect the bus voltage to complete the motor control. Optionally, the second control feedback signal is a signal required for motor square wave control, such as bus voltage. The control method at this time may be the motor square wave control method to maintain the motor to continue to rotate.

It should be noted that the MCU/DSP chip can directly collect the bus voltage signal to obtain the second control feedback signal, which provides signals for designing redundant control. The MCU/DSP chip can directly generate PWM high and low level signals to the PWM conditioning circuit.

In an optional implementation manner, when the digital control chip-based control circuit path composed of the first power supply channel, the first voltage conversion circuit, the digital control chip and the PWM conditioning circuit fails, When the first power supply channel or the second power supply channel supplies power to the second voltage conversion circuit through the power supply selection logic circuit, the digital logic chip is configured to use an analog-to-digital conversion circuit to obtain a first control feedback signal, calculate and generate PWM high and low level signals according to the first control feedback signal, and send the PWM high and low level signals to the PWM conditioning circuit; the PWM conditioning circuit is used to The signal generates the motor drive signal.

In the embodiment of the present invention, the digital control chip is a micro control unit or a digital signal processor; the digital logic chip is a field programmable logic gate array or an application specific integrated circuit. In specific implementation, the circuit structure can be realized according to the motor control circuit structure diagram shown in FIG. 3 . Based on the circuit shown in Figure 3, based on the circuit path failure of the DSP/MCU chip, refer to the motor control circuit structure diagram 1 in the case of a fault shown in Figure 5. At this time, the motor control is independently provided by the circuit path based on the FPGA/ASIC chip to control the low voltage. The power supply can be channel 1 or channel 2, which is determined by the power supply selection logic circuit detecting the power supply level.

The present invention provides a motor control circuit and method and a motor drive system for the circuit design of the motor control board of the motor driver. The circuit detects the power supply levels of the first voltage conversion circuit and the second voltage conversion circuit. If one of the power supply channels fails , then control another power supply channel to supply power to the first voltage conversion circuit and or the second voltage conversion circuit. When any control circuit path fails, the control circuit path based on the digital control chip or the control circuit path based on the digital logic chip can be used to ensure the continuous control of the motor by the motor control circuit, reduce the failure rate of the control system, and improve the efficiency of the drive system. reliability. The circuit is designed with redundant circuits based on different physical mechanisms for the control circuit part of the motor driver control board: the control circuit path based on the MCU/DSP chip or the control circuit path based on the FPGA/ASIC chip, and the healthy path is selected under different failure modes And the control strategy to complete the motor control, thereby reducing the failure rate of the drive control circuit and improving the reliability of the entire drive system.

The exemplary embodiment of the present application also provides a motor control method, the motor control method is applied to the above-mentioned motor control circuit, and the method includes: acquiring a motor control feedback signal; the motor control feedback signal is a first control feedback signal Or a second control feedback signal; using the motor control circuit to generate a motor driving signal; using the motor driving signal to control the motor.

In an optional implementation manner, when the first power supply channel supplies power to the first voltage conversion circuit through the power supply selection logic circuit, and the second power supply channel supplies power to the first voltage conversion circuit through the power supply selection logic circuit When the second voltage conversion circuit supplies power, the digital logic chip uses an analog-to-digital conversion circuit to obtain a first control feedback signal, and sends the first control feedback signal to the digital control chip; the digital control chip, receiving the first control feedback signal, performing calculations according to the first control feedback signal to generate a control modulation wave, and sending the control modulation wave to the digital logic chip; the digital logic chip, according to the control modulation wave Generate PWM high and low level signals, and send the PWM high and low level signals to the PWM conditioning circuit; the PWM conditioning circuit generates motor drive signals according to the PWM high and low level signals.

In an optional implementation manner, the first control feedback signal is one or more of the following signals: current signal, voltage signal, speed signal and temperature signal.

In an optional implementation manner, the power supply selection logic circuit detects the power supply levels of the first voltage conversion circuit and the second voltage conversion circuit, and judges whether the first power supply channel and the The operating status of the second power supply channel; if the first power supply channel fails, control the second power supply channel to replace the first power supply channel; if the second power supply channel fails, control the first power supply channel Replace the second power supply channel.

In an optional implementation manner, when the digital logic chip-based control circuit path composed of the second power supply channel, the second voltage conversion circuit, the digital logic chip, and the PWM conditioning circuit fails, The digital control chip acquires a second control feedback signal, calculates and generates PWM high and low level signals according to the second control feedback signal, and sends the PWM high and low level signals to the PWM conditioning circuit; the PWM conditioning A circuit for generating a motor drive signal according to the PWM high and low level signals.

In an optional implementation manner, the second control feedback signal is a signal required for motor square wave control.

In an optional implementation manner, when the digital control chip-based control circuit path composed of the first power supply channel, the first voltage conversion circuit, the digital control chip and the PWM conditioning circuit fails, The digital logic chip uses an analog-to-digital conversion circuit to obtain a first control feedback signal, calculates and generates PWM high and low level signals according to the first control feedback signal, and sends the PWM high and low level signals to the PWM conditioning circuit ; The PWM conditioning circuit generates a motor drive signal according to the PWM high and low level signals.

In an optional embodiment, the digital control chip is a micro control unit or a digital signal processor; the digital logic chip is a field programmable logic gate array or an application specific integrated circuit.

Exemplary embodiments of the present application further provide a motor drive system, wherein the motor drive system includes a motor and the motor control circuit described above.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.

Claims (10)

1. A motor control circuit, comprising: a first power supply channel, a second power supply channel, a power supply selection logic circuit, a first voltage conversion circuit, a digital control chip, a second voltage conversion circuit, a digital logic chip and a PWM conditioning circuit; The first voltage conversion circuit is connected to the digital control chip, and the digital control chip is respectively connected to the digital logic chip and the PWM conditioning circuit; The second voltage conversion circuit is connected to the digital logic chip, and the digital logic chip is connected to the PWM conditioning circuit; The power supply selection logic circuit is configured to control the first power supply channel to supply power to the first voltage conversion circuit or the second voltage conversion circuit; The power supply selection logic circuit is further configured to control the second power supply channel to supply power to the first voltage conversion circuit or the second voltage conversion circuit. 2. The motor control circuit according to claim 1, wherein when the first power supply channel supplies power to the first voltage conversion circuit through the power supply selection logic circuit, and the second power supply channel passes through the When the power supply selection logic circuit supplies power to the second voltage conversion circuit, The digital logic chip is used to obtain a first control feedback signal by using an analog-to-digital conversion circuit, and send the first control feedback signal to the digital control chip; The digital control chip is configured to receive the first control feedback signal, perform calculation according to the first control feedback signal to generate a control modulation wave, and send the control modulation wave to the digital logic chip; The digital logic chip is also used to generate PWM high and low level signals according to the control modulation wave, and send the PWM high and low level signals to the PWM conditioning circuit; The PWM conditioning circuit is used to generate a motor drive signal according to the PWM high and low level signals. 3. The motor control circuit according to claim 2, wherein the first control feedback signal is one or more of the following signals: current signal, voltage signal, speed signal and temperature signal. 4. The motor control circuit according to claim 1, wherein the power supply selection logic circuit is configured to: Detecting the power supply levels of the first voltage conversion circuit and the second voltage conversion circuit, and judging the operating states of the first power supply channel and the second power supply channel according to the power supply levels; If the first power supply channel fails, control the second power supply channel to replace the first power supply channel; If the second power supply channel fails, the first power supply channel is controlled to replace the second power supply channel. 5. The motor control circuit according to claim 1, wherein when the control circuit based on the digital logic chip composed of the second power supply channel, the second voltage conversion circuit, the digital logic chip and the PWM conditioning circuit When the circuit path fails, the The digital control chip is configured to obtain a second control feedback signal, perform calculations according to the second control feedback signal to generate PWM high and low level signals, and send the PWM high and low level signals to the PWM conditioning circuit; The PWM conditioning circuit is used to generate a motor drive signal according to the PWM high and low level signals. 6. The motor control circuit according to claim 5, wherein the second control feedback signal is a signal required for motor square wave control. 7. The motor control circuit according to claim 1, wherein when the digital control chip-based control composed of the first power supply channel, the first voltage conversion circuit, the digital control chip and the PWM conditioning circuit When the circuit path fails, the The digital logic chip is configured to use an analog-to-digital conversion circuit to obtain a first control feedback signal, calculate and generate PWM high and low level signals according to the first control feedback signal, and send the PWM high and low level signals to the PWM conditioning circuit; The PWM conditioning circuit is used to generate a motor drive signal according to the PWM high and low level signals. 8. The motor control circuit according to any one of claims 1-7, wherein the digital control chip is a micro control unit or a digital signal processor; the digital logic chip is a field programmable logic gate array or an application-specific integration circuit. 9. A motor control method, wherein the motor control method is applied to the motor control circuit according to any one of claims 1-8, the method comprising: Obtaining a motor control feedback signal; the motor control feedback signal is a second control feedback signal or a first control feedback signal; generating a motor drive signal using the motor control circuit; The motor is controlled using the motor drive signal. 10. A motor drive system, wherein the motor drive system comprises a motor and the motor control circuit according to any one of claims 1-8.

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