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:
Oct. 31, 2000
Filed:
Apr. 06, 1999
Applicant:
Inventor:
Shu-Yuan Chin, Hsin-Chu, TW;
Assignee:
Primary Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318254 ; 318138 ; 318439 ;
Abstract
A fan driver is provided to drive a DC brushless fan. The fan driver has a pulse generator for receiving a signal indicating the phase of a rotor in the fan from a Hall element and generating two pulse signals whose phases are inverted by about 180.degree.. Two driving units activated by the two pulse signals, respectively, are provided to alternatively apply current to the two coils thereby generating magnetic fields to rotate the rotor of the fan. Two switch elements are connected to the two driving units so that anti-electromotive voltage generated by one of the two coils can be transferred to the other coil.