Control and detection circuit for DC motor as well as control and detection method for DC motor

Abstract

The invention is suitable for the field of control and detection for a DC motor, and provides a control circuit for the DC motor. The control circuit comprises a micro-control unit, a signal drive circuit, an electronic switch circuit, a motor drive circuit, the DC motor and a motor protection circuit. Meanwhile, the invention also provides a detection circuit for the DC motor. The detection circuit comprises the micro-control unit, a signal drive circuit, an electronic switch circuit, a feedback signal voltage division circuit, a lowpass filtering circuit, the DC motor and the motor protection circuit. According to the control circuit for the DC motor provided in the invention and a matched control method, the starting, stopping and rotation speed of the DC motor can be effectively controlled through pulse width modulation (PWM) technology, so that the motor is allowed to work stably; and meanwhile, according to the detection circuit for the DC motor and a matched detection method in the invention, voltages at the two ends of a power supply of the DC motor are detected, so that the DC motor can be guaranteed to work safely, real-time performance of motor control is improved and the accuracy of motor protection is improved, and the circuit is simple and reliable.

Description

technical field [0001] The invention belongs to the technical field of motor control and detection, and in particular relates to a control and detection circuit of a DC motor and a control and detection method of the DC motor. Background technique [0002] In the control of the DC motor, it not only involves the start and stop of the DC motor, but generally controls the start and stop of the DC motor or the forward and reverse rotation of the motor by controlling the on and off of the relay. In some electrical appliances, the requirement for the speed of the DC motor speed is also adjustable. For example, the air volume of the car air conditioner must be controlled in stages; some electrical appliances have high requirements for the accuracy of the DC motor speed. The car engine preheating problem in the environment, the installed car auxiliary fuel heater contains two DC motors that need to be controlled, namely the circulating water pump motor and the combustion fan motor....

AI Technical Summary

Problems solved by technology

At the same time, unexpected conditions may occur during the working process of the DC motor, such as motor open circuit, short circuit and other situations that cannot work normally. of security incidents

The traditional protection method is to use hardware protection and use fuses to directly disconnect the power supply. However, for equipment with multiple devices working together, it has not been able to solve the problem from the source. The control unit is still operating incorrectly, which may easily lead to safety accidents.

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