Fault self-stop closed-loop control system for motor

Abstract

The utility model provides a fault self-stop closed-loop control system for a motor, which realizes that a main control circuit can still control a controlled unit to start and stop in an emergency state under the condition that a closed-loop controller cannot normally communicate, and avoids the situation that whether the closed-loop controller cannot communicate with the main control unit or not, so that the fault self-stop closed-loop control system is damaged. The closed-loop control system comprises a main control circuit, a closed-loop controller, a motor and a communication circuit, the closed-loop controller is connected with a communication interface of the main control circuit through the communication circuit, a control output end of the closed-loop controller is electrically connected with a control interface of the motor, and the closed-loop control system further comprises a power circuit. The power supply circuit comprises a power supply management circuit and a motor output power control circuit, and the motor output power circuit is configured to be of a structure for receiving a control instruction of the main control circuit to perform on-off control on a power supply circuit of the closed-loop controller.

Description

Technical Field

[0001] The utility model relates to a closed-loop control system of a stepping motor, in particular to a closed-loop control system with fault self-shutdown for a motor. Background Art

[0002] According to whether the feedback information of the execution unit is used as a control condition, the control system is divided into an open-loop control system and a closed-loop control system. In an open-loop control system, when the operator starts the system and makes it enter the operating state, the system sends the operator's instructions to the controlled object once. After that, the operator cannot further control the changes of the controlled object. In a man-machine system designed with open-loop control, the design of the operation instructions is very important. Once an error occurs, irreparable losses will be caused.

[0003] In a closed-loop control system, when the operator starts the system, the control information is sent to the controlled object through the system operation, and the state information of the controlled object is fed back to the input to correct the operation process, so that the output of the system meets the expected requirements. Closed-loop control is a relatively flexible and high-performance control method, and most control methods in industrial production adopt the design of closed-loop control.

[0004] In the process of the motor serving as an execution unit in a closed-loop control system, the start-stop, steering, and speed control of the motor are its core issues. In the above-mentioned closed-loop control system, the control unit generally includes a main control circuit and a closed-loop controller. The main control circuit sends control instructions to the closed-loop controller, and the closed-loop controller operates the motor according to the instructions. In one case, if a communication failure occurs between the main control circuit and the closed-loop controller after the closed-loop controller obtains the control instruction from the main control circuit and operates the motor, and the closed-loop controller cannot receive the main control instruction, the controlled motor will continue to operate according to the previous instruction. Once a fault occurs in the external system, the continuous operation of the controlled motor will cause serious consequences. Summary of the Utility Model

[0005] In view of the above problems, the utility model provides a closed-loop control system with fault self-shutdown for a motor, which realizes that when the closed-loop controller cannot communicate normally, the main control circuit can still control the start and stop of the controlled unit in an emergency state, avoiding the problem that the closed-loop control system cannot perform emergency start and stop control due to the inability of the closed-loop controller to communicate with the main control.

[0006] Its technical solution is as follows: it includes a main control circuit, a closed-loop controller, a motor, and a communication circuit. The closed-loop controller is connected to the communication interface of the main control circuit through the communication circuit, and the control output end of the closed-loop controller is electrically connected to the control interface of the motor. It also includes a power supply circuit, and the power supply circuit includes a power management circuit and a motor output power control circuit. The motor output power circuit is configured to receive the control instruction of the main control circuit to control the on-off of the power supply circuit of the closed-loop controller.

[0007] In the above or some embodiments, the motor output power circuit is connected in series to the power supply terminal of the closed-loop controller, and further includes the drain of an MOS transistor connected in series to the power supply terminal of the closed-loop controller. The gate of the MOS transistor is connected to the PWM wave output terminal of the main control circuit, and the source of the MOS transistor is connected to the IO_STOP terminal of the main control circuit through the base and collector of a triode.

[0008] In the above or some embodiments, the main control circuit further includes a forward and reverse stop switch control circuit, and the forward and reverse stop switch control circuit includes a double-pole double-throw switch, and the double-pole double-throw switch corresponds to three different ADC detection input voltages of the main controller.

[0009] In the above or some embodiments, a motor forward and reverse state indication circuit is further included. The motor forward and reverse state indication circuit includes two light-emitting diodes connected in parallel and facing in opposite directions. One end of the parallel-connected diodes is connected to the motor forward voltage terminal, and the other common end of the parallel diodes is connected to the motor negative voltage ground terminal.

[0010] In the above or some embodiments, a serial port isolation communication circuit between the main controller and the closed-loop controller is further included; the serial port isolation communication circuit includes a digital isolation chip 122U31. The serial port transmission terminal of the main controller is connected to the VIA interface of the digital isolation chip 122U31, the VOA interface of the digital isolation chip 122U31 is connected to the M_RXD interface of the closed-loop controller, and the VIB interface of the digital isolation chip 122U31 is connected to the M_TXD interface of the closed-loop controller.

[0011] In the above or some embodiments, a display circuit is further included. The display circuit includes a digital tube driving circuit and a digital tube display circuit. The digital tube driving circuit uses a TM1628A digital tube driving chip. The DI / O interface is connected to the PB5 / IIC_SDA interface of the main controller, the CLK interface of the TM1628A digital tube driving chip is connected to the PB4 / IIC_SCL interface of the main controller, and the STB interface of the TM1628A digital tube driving chip is connected to the PA3 / TIM2_CH3 interface of the main controller.

[0012] In the above or some embodiments, a buzzer circuit is further included. The buzzer signal input terminal is connected to the PC3 / TIM3_CH3 interface of the main controller, and a voltage-dividing resistor, a triode Q6, and a buzzer connected in series are further included. The emitter of the triode Q6 is grounded.

[0013] In the process of the motor serving as an execution unit in a closed-loop control system, after the closed-loop controller obtains the control instruction from the main control circuit and operates the motor, once a communication failure occurs between the main control circuit and the closed-loop controller and the closed-loop controller cannot receive the main control instruction, the main controller can control the power on and off of the closed-loop controller to achieve the forced shutdown and power-off protection functions of the motor. On the other hand, the forward and reverse control circuit can realize the forward and reverse rotation of the stepper motor and can display the forward and reverse rotation status display function. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the circuit topology diagram of the present utility model.

[0015] Figure 2 is the motor output power circuit described in the present utility model.

[0016] Figure 3 is the forward and reverse stop switch control circuit of the present utility model.

[0017] Figure 4 is the motor forward and reverse status indication circuit of the present utility model.

[0018] Figure 5 is the serial port isolation communication circuit of the present utility model.

[0019] Figure 6 is the display circuit of the present utility model.

[0020] Figure 7 is the digital encoder circuit of the present utility model.

[0021] Figure 8 is the buzzer alarm circuit of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present utility model and should not be construed as limiting the present utility model.

[0023] In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0024] Such as Figure 1As shown in the figure, the technical solution of this patent includes a main controller, a closed-loop controller, a stepping motor, a serial port isolation communication circuit, a power management circuit, a motor output power control circuit, a forward and reverse stop switch control circuit, a motor forward and reverse status indication circuit, a display circuit, and a buzzer alarm circuit. The main controller realizes serial communication connection with the closed-loop controller through the serial port isolation communication circuit. The power supply circuit includes a power management circuit and a motor output power control circuit. The power supply circuit provides the required power supply voltage for each part of the circuit. The motor output power circuit is configured to receive the control instruction of the main control circuit to control the on-off of the power supply circuit of the closed-loop controller. In the above or some embodiments, such as Figure 2 As shown in the figure, the motor output power circuit includes a series connection to the power supply terminal of the closed-loop controller, and also includes the drain of an MOS transistor connected in series with the power supply terminal of the closed-loop controller. The gate of the MOS transistor is connected to the PWM wave output terminal of the main control circuit. The source of the MOS transistor is connected to the IO_STOP terminal of the main control circuit through the base and collector of a triode. When the MOS transistor Q2 is turned on, the motor is powered on and works. When the MOS transistor Q2 is not turned on, the motor is not powered on and does not work. When this circuit is turned on, the controlled motor is powered on and works. When this part of the circuit is not turned on, the power supply of the controlled motor is not powered on. When the motor state is abnormal, the control of the motor power supply can be realized through this circuit. After cutting off the power supply, the motor can be ensured to stop rotating.

[0025] The forward and reverse stop switch control circuit, as Figure 3 As shown in the figure, the forward and reverse stop switch control circuit includes a double-pole double-throw switch, and the double-pole double-throw switch corresponds to three different ADC detection input voltages of the main controller. Specifically, by switching the forward and reverse switch, the ADC detection port of the main control chip detects different voltage values, including a voltage detection terminal (ADC detection terminal) connected to the PC4 / TIM1_CH4 interface of the main controller. The voltage detection terminal is connected in series with a voltage dividing resistor R2 to a 5V voltage and connected to the common terminal 2 of the double-pole double-throw switch. The other end of the common terminal 2 of the double-pole double-throw switch is connected to the VCC_M+ terminal; for the switch position 3 of the double-pole double-throw switch, one end is connected in series with a voltage dividing resistor R3 and grounded, and the other end is connected to the input voltage VCCIN; for the switch position 2 of the double-pole double-throw switch, both ends are grounded; thus, the input for controlling the forward, stop, and reverse states is realized. Through the processing of the main control chip, a control command is sent to the closed-loop controller to control the forward rotation, reverse rotation, and stop of the motor. In the above or some embodiments, it further includes a motor forward and reverse status indication circuit. The motor forward and reverse status indication circuit includes two light-emitting diodes connected in parallel with opposite directions. One end of the parallel diodes is connected to the motor forward voltage terminal, and the other common end of the parallel diodes is connected to the motor negative voltage grounding terminal.

[0026] To avoid signal disorders between the closed-loop controller and the out controller, in the above or some embodiments, a serial port isolation communication circuit for the main controller and the closed-loop controller is further included; the serial port isolation communication circuit includes a digital isolation chip 122U31. The serial port transmission end of the main controller is connected to the VIA interface of the digital isolation chip 122U31. The VOA interface of the digital isolation chip 122U31 is connected to the M_RXD interface of the closed-loop controller. The VIB interface of the digital isolation chip 122U31 is connected to the M_TXD interface of the closed-loop controller.

[0027] To display information such as the rotation speed of the stepper motor, a digital encoder circuit and a digital tube display circuit are further introduced. The digital encoder circuit includes an EC11 encoder. The A, B, and D pins of the EC11 encoder are connected to the PD2 / AIN3, PD3 / AIN4, and PC7 / SPI_MISO interfaces of the main controller. In the above or some embodiments, a display circuit is further included. The display circuit includes a digital tube driving circuit and a digital tube display circuit. The DI / O interface of the TM1628A digital tube driving chip in the digital tube driving circuit is connected to the PB5 / IIC_SDA interface of the main controller. The CLK interface of the TM1628A digital tube driving chip is connected to the PB4 / IIC_SCL interface of the main controller. The STB interface of the TM1628A digital tube driving chip is connected to the PA3 / TIM2_CH3 interface of the main controller.

[0028] To give an early warning of an emergency state, a buzzer alarm circuit is further included. In the above or some embodiments, a buzzer circuit is further included. The signal input end of the buzzer is connected to the PC3 / TIM3_CH3 interface of the main controller. A voltage-dividing resistor, a triode Q6, and a buzzer connected in series are further included. The emitter of the triode Q6 is grounded.

[0029] In the process of the motor being an execution unit in the closed-loop control system in this technical solution, after the closed-loop controller obtains the control instruction of the main control circuit and operates the motor, once a communication failure occurs between the main control circuit and the closed-loop controller and the closed-loop controller cannot receive the main control instruction, the main controller can control the power on and off of the closed-loop controller to achieve the forced shutdown and power-off protection functions of the motor. On the other hand, the forward and reverse control circuit can realize the forward and reverse rotation of the stepper motor and can display the forward and reverse rotation state display function.

Claims

1. A closed-loop control system for motor with fault self-shutdown, comprising a main control circuit, a closed-loop controller, a motor, and a communication circuit. The closed-loop controller is connected to the communication interface of the main control circuit through the communication circuit, and the control output end of the closed-loop controller is electrically connected to the control interface of the motor. It further includes a power supply circuit, characterized in that, The power supply circuit includes a power management circuit and a motor output power control circuit. The motor output power circuit is configured to receive the control instruction of the main control circuit to control the on / off of the power supply circuit of the closed-loop controller.

2. The closed-loop control system for motor fault self-shutdown according to claim 1, characterized in that, The motor output power circuit includes a component connected in series to the power supply terminal of the closed-loop controller, and further includes the drain of a MOS transistor connected in series with the power supply terminal of the closed-loop controller. The gate of the MOS transistor is connected to the PWM wave output terminal of the main control circuit, and the source of the MOS transistor is connected to the IO_STOP terminal of the main control circuit through the base and collector of a triode.

3. The closed-loop control system for motor fault self-shutdown according to claim 2, wherein The main control circuit further includes a forward / reverse stop switch control circuit, and the forward / reverse stop switch control circuit includes a double-pole double-throw switch, and the double-pole double-throw switch corresponds to the ADC detection input voltages of three different main controllers.

4. The closed-loop control system for motor with fault self-shutdown according to claim 3, characterized in that, It further includes a motor forward / reverse state indication circuit. The motor forward / reverse state indication circuit includes two light-emitting diodes connected in parallel with opposite directions. One end of the parallel-connected diodes is connected to the motor forward voltage terminal, and the other common end of the parallel diodes is connected to the motor negative voltage ground terminal.

5. The closed-loop control system for motor fault self-shutdown according to claim 4, characterized in that, It further includes a serial port isolation communication circuit between the main controller and the closed-loop controller; the serial port isolation communication circuit includes a digital isolation chip 122U31. The serial port transmission end of the main controller is connected to the VIA interface of the digital isolation chip 122U31. The VOA interface of the digital isolation chip 122U31 is connected to the M_RXD interface of the closed-loop controller, and the VIB interface of the digital isolation chip 122U31 is connected to the M_TXD interface of the closed-loop controller.

6. The closed-loop control system for motor with fault self-shutdown according to claim 5, characterized in that, It further includes a display circuit. The display circuit includes a digital tube driving circuit and a digital tube display circuit. The digital tube driving circuit uses a TM1628A digital tube driving chip. The DI / O interface is connected to the PB5 / IIC_SDA interface of the main controller, the CLK interface of the TM1628A digital tube driving chip is connected to the PB4 / IIC_SCL interface of the main controller, and the STB interface of the TM1628A digital tube driving chip is connected to the PA3 / TIM2_CH3 interface of the main controller.

7. The closed-loop control system for motor with self-shutdown in case of fault according to claim 6, characterized in that, It further includes a buzzer circuit. The buzzer signal input end is connected to the PC3 / TIM3_CH3 interface of the main controller. It also includes a series-connected voltage-dividing resistor, a triode Q6, and a buzzer, and the emitter of the triode Q6 is grounded.

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