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:
Jan. 12, 2010
Filed:
Aug. 03, 2007
Ching-cheng MA, Pingtung County, TW;
Ching-Cheng Ma, Pingtung County, TW;
ADDA Corporation, Pingtung, TW;
Abstract
A control circuit for fan operating comprises a drive operating circuit, a potential modulating circuit, a comparator and a switch circuit. The drive operating circuit at least has a voltage source, a drive IC, a Hall IC and a motor coil winding, the drive IC is connected with the voltage source, and the Hall IC and the motor coil winding are connected with the drive IC. The potential modulating circuit is connected with the drive IC of the drive operating circuit and has a modulating signal source to provide a PWM signal with a duty cycle. The comparator has an input end and an output end, the input end is connected with the potential modulating circuit, and potential state of the output end is determined in accordance with the duty cycle of the PWM signal. The switch circuit is connected with the drive IC of the drive operating circuit and the output end of the comparator, and operating state of the drive IC of the drive operating circuit is determined in accordance with potential state of the output end.