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. 24, 2008
Filed:
Feb. 26, 2007
Applicants:
Bruce R. Ferguson, Anaheim, CA (US);
George C. Henry, Simi Valley, CA (US);
Roger Holliday, Santa Ana, CA (US);
Inventors:
Bruce R. Ferguson, Anaheim, CA (US);
George C. Henry, Simi Valley, CA (US);
Roger Holliday, Santa Ana, CA (US);
Assignee:
Microsemi Corporation, Irvine, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B 37/02 (2006.01); G09G 3/36 (2006.01);
U.S. Cl.
CPC ...
Abstract
An illumination control circuit allows a user to set a desired brightness level and maintains the desired brightness level over temperature and life of a light source. The illumination control circuit uses a dual feedback loop with both optical and thermal feedbacks. The optical feedback loop controls power to the light source during normal operations. The thermal feedback loop overrides the optical feedback loop when the temperature of the light source becomes excessive.