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. 29, 2010
Filed:
Apr. 17, 2008
Kai-ping Lin, Hsinchu, TW;
Tsung-jen Lin, Hsinchu, TW;
Kai-Ping Lin, Hsinchu, TW;
Tsung-Jen Lin, Hsinchu, TW;
Fitipower Integrated Technology, Inc., Miaoli County, TW;
Abstract
An exemplary fan driving system includes a driving device and a MOSFET group. The driving device includes a first adjustable resistor connected between its first voltage signal input terminal and ground, and a second adjustable resistor connected between its second voltage signal input terminal and ground. The MOSFET group includes two N-type MOSFETs and two P-type MOSFETs. The first terminal of the fan is connected to an anode of Dand a cathode of D. The second terminal of the fan is connected to an anode of Dand a cathode of D. Cathodes of the Dand Dare configured to connect a supply voltage. Anodes of the Dand Dboth are grounded. The fan driving system can effectively discharge off the residual current in the coil of the fan at the moment of the MOSFET group being switched off.