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. 20, 2009
Filed:
Feb. 24, 2004
Applicant:
Ludger Mimberg, San Jose, CA (US);
Inventor:
Ludger Mimberg, San Jose, CA (US);
Assignee:
NVIDIA Corporation, Santa Clara, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05B 11/28 (2006.01);
U.S. Cl.
CPC ...
Abstract
Embodiments of the present invention provide a low noise and high efficiency fan speed controller. The fan speed controller generates a pulse width modulation signal. The pulse width modulation signal is utilized to switch mode convert a supply voltage into a linear voltage. The voltage level of the linear voltage is a function of the pulse width modulation signal. The linear voltage is utilized to control the operating speed of a direct current fan.