DC (Direct-current) brushless motor driving control device for collecting zero crossing point based on hardware comparison

Abstract

The invention discloses a DC (direct-current) brushless motor driving control device for collecting a zero crossing point based on hardware comparison. The device comprises a power module, a motor control module, a power tube driving module, a motor driving power module and a zero crossing point judging module, wherein the power module is used for providing voltage; the motor control module is used for generating the first to sixth PWM (pulse width modulation) waves and adjusting the first to sixth PWM waves according to the zero crossing point judgment result so as to control the reversing and rotation speed of the DC brushless motor; the power tube driving module is used for generating the first to sixth driving signals according to the first to sixth PWM waves; the motor driving power module is used for driving the DC brushless motor; and the zero crossing point judging module is used for dividing voltage of the first-phase to third-phase back electromotive force signals, generating a neutral point according to the phase-voltage signals after the voltage division, and comparing the neutral point with the phase-voltage signals after the voltage division to generate a judgment result about whether the DC brushless motor crosses the zero point. According to the invention, the production cost and complexity of the system can be reduced, and the reliability of the system can be improved.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a brushless DC motor drive control device for collecting zero-crossing points based on hardware comparison. Background technique [0002] The commutation circuit of a brushless DC motor usually includes two parts: drive and control. Among them, the driving circuit outputs electric power, drives the armature winding of the motor, and is controlled by the control circuit. At present, the driving circuit has changed from a linear amplification state to a pulse width modulation switching state, and the corresponding circuit composition has also changed from a transistor discrete circuit to a modular integrated circuit. The control circuit is used to control the speed, steering, current (or torque) of the motor and protect the motor from overcurrent, overvoltage, overheating, etc. [0003] The rotor speed of the brushless DC motor is directly proportional to the back electromo...

AI Technical Summary

Problems solved by technology

However, the use of position sensors will not only increase the cost and complexity of the system and occupy the space of the system, but also lead to the reduction of system reliability, environmental adaptability and anti-interference ability.

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