Hon Hai Precision Industry Co., Ltd.

Puh-Yun Lee

Yuh-Ching Chang

Chien-Yi Lo

Sung-Jen Hsiang

A method for controlling the rotating speed of a fan is disclosed. The method includes the steps of: reading a standard temperature Tof a central processing unit (CPU); reading a thermal diode's temperature Tand a system ambient temperature T; comparing Twith a minimum temperature T, such that the fan begins processing the heat of the CPU begins; if T&#x3e;T, increasing pulse-width modulation (PWM) duty cycle of the fan to 100%; if T&#x3c;=T, comparing a critical temperature Twith T; if T&#x3e;T, increasing PWM fan duty cycle to 100%; if T&#x3c;=T, setting the fan duty cycle at 40%; sending the PWM fan duty cycle to a fan speed controller.

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Guangdong, China

Puh-Yun Lee