Richtek Technology Corporation

Haó-Yu Chang

Wei-Hsu Chang

Pei-Cheng Huang

Kuo-Chung Lee

Jo-Yu Wang

Yen-Shin Lai

Shiue-Shr Jiang

Yu-Kuang Wu

Jen-Hung Chi

Chih-Chang Chen

A method and apparatus for dynamically adjusting a dead time of a BLDC motor during a phase change detect the winding current of the BLDC motor during the dead time, and terminate the dead time when the winding current is detected to be substantially or close to zero. Thus, the method and apparatus can optimize the dead time and switch the BLDC motor between two phases at a zero-current point, without reducing the maximum rotation speed of the BLDC motor.

Method and apparatus for dynamically adjusting a dead time of brushless direct current motor during a phase change

A zero-crossing detection circuit and a commutation device using the zero-crossing detection circuit are provided. The zero-crossing detection circuit is adapted into a three-phase brushless DC (direct current) motor with first to third coils. One terminal of each of the first to third coils is electrically coupled together with each other. The detection circuit comprises a first selection circuit, a second selection circuit and a comparator. The first selection circuit and the second selection circuit are both electrically coupled to another terminals of the first to third coils, to obtain first to third terminal voltages, and output one of the first to third terminal voltages according to a selection signal. The comparator is configured for comparing an output of the first selection circuit and an output of the second selection circuit, to output a comparing result.

Zero-crossing detection circuit and commutation device using the zero-crossing detection circuit

Growing community of inventors

Taipei, Taiwan

Haó-Yu Chang