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:
May. 02, 2006
Filed:
Jun. 04, 2004
Yu-liang Lin, Taoyuan, TW;
Yueh-lung Huang, Taoyuan, TW;
Tsung-yu Lei, Taoyuan, TW;
Ju-wen Hsieh, Taoyuan, TW;
Wen-shi Huang, Taoyuan, TW;
Yu-liang Lin, Taoyuan, TW;
Yueh-lung Huang, Taoyuan, TW;
Tsung-yu Lei, Taoyuan, TW;
Ju-wen Hsieh, Taoyuan, TW;
Wen-shi Huang, Taoyuan, TW;
Delta Electronics, Inc., , TW;
Abstract
A fan motor speed control circuit includes a driving circuit, a voltage division circuit, and a speed modulator. The voltage division circuit has a first transistor and a plurality of resistors and is connected between a voltage source and the driving circuit. The speed modulator has a second transistor and a plurality of parallel resistors and is connected between the voltage division circuit and the driving circuit. The current of the fan motor speed control circuit flows through a first path under a first input voltage generated from the voltage source and through a second path under a second input voltage larger than the first one; the parallel resistors are in the second path such that the current value passing through the driving circuit varies according to the resulting resistance value of the parallel resistors.