Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Bruce R. Ferguson0
George C. Henry0
Roger Holliday0
Date of Patent
February 27, 2007
Patent Application Number
10937889
Date Filed
September 9, 2004
Patent Primary Examiner
Patent 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.
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