Patent ID: 8643317

Claim:
A single phase DC brushless motor controller, comprising: a micro control unit comprising: a Pulse Width Modulation (PWM) pin for receiving a PWM signal from a system; a commutation logic unit for controlling the speed and rotation of a single phase DC brushless motor according to the PWM signal, wherein the commutation logic unit determines whether to change the rotation direction of the single phase DC brushless motor based on whether the duty cycle of the PWM signal exceeds a predetermined duty cycle, and a magnetic field control unit, coupled to the micro control unit, for being controlled by the micro control unit to change the magnetic field of a stator of the single phase DC brushless motor, wherein when the commutation logic unit is about to change the rotation direction of the single phase DC brushless motor, the commutation logic unit first makes the magnetic field control unit eliminate the magnetic field of the stator and then makes the magnetic field control unit generate a reverse rotation magnetic field at the time the single phase DC brushless motor is still rotating under inertia-driven force circumstance.