Asian Power Devices Inc.

Shao-Hsien Chiu

Tsung-Liang Hung

A hybrid-mode power factor corrector includes a power factor correction circuit, a zero-crossing detection circuit, and a controller. The power factor correction circuit includes a power inductor and a power switch, and the zero-crossing detection circuit detects an inductor current. The controller controls the switching of the power switch by an operation frequency to control the power factor correction circuit converting an input voltage into an output voltage, and controls an input current drawn by the power factor correction circuit to follow the input voltage. The controller turns on the power switch to according to a switching time of the power switch when the power switch is switched to reach to the operation frequency and the inductor current is as low as a threshold value close to zero.

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Taoyuan, Taiwan

Shao-Hsien Chiu