Patent ID: 8878472
Filing Date: 2014-11-04
Classification: H02P

Abstract:
1. A motor driving circuit, for driving a single-phase brushless motor, comprising: a zero-crossing detection comparator, for comparing a pair of Hall signals having reverse phases and representing a rotor position of the motor, and generating a level-shifted zero-crossing detection signal at each zero-crossing timing when the Hall signals cross each other; a control circuit, for receiving the zero-crossing detection signal, switching a driving phase at each zero-crossing timing to rotationally drive the motor, and regeneratively controlling the motor during a duration from a first time point ahead of each zero-crossing timing by a first time width to a second time point behind each zero-crossing timing by a second time width shorter than the first time width; and a differential amplifier, for amplifying a difference between the pair of Hall signals and generating a differential signal corresponding to the difference, wherein the control circuit comprises: