The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 26, 2007
Filed:
Jun. 01, 2006
Sung-jen Hsiang, Guangdong, CN;
Yuh-ching Chang, Guangdong, CN;
Chien-yi Lo, Guangdong, CN;
Puh-yun Lee, Guangdong, CN;
Sung-Jen Hsiang, Guangdong, CN;
Yuh-Ching Chang, Guangdong, CN;
Chien-Yi Lo, Guangdong, CN;
Puh-Yun Lee, Guangdong, CN;
Hon Hai Precision Industry Co., Ltd., Tu-Cheng, Taipei Hsien, TW;
Abstract
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>T, increasing pulse-width modulation (PWM) duty cycle of the fan to 100%; if T<=T, comparing a critical temperature Twith T; if T>T, increasing PWM fan duty cycle to 100%; if T<=T, setting the fan duty cycle at 40%; sending the PWM fan duty cycle to a fan speed controller.