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:
Dec. 06, 2011
Filed:
Oct. 21, 2009
Bruce Richard Roberts, Mentor-on-the-Lake, OH (US);
Deeder Aurongzeb, Mayfield Heights, OH (US);
Kevin Carr Payne, Brecksville, OH (US);
Bruce Richard Roberts, Mentor-on-the-Lake, OH (US);
Deeder Aurongzeb, Mayfield Heights, OH (US);
Kevin Carr Payne, Brecksville, OH (US);
General Electric Company, Schenectady, NY (US);
Abstract
A knowledge-based driver is provided for powering a solid-state light source with a constant current, including a memory that stores lumens per amp and volts per amp performance characterizations of the light source over time, and a controller that operates in a test mode to estimate the light source degradation based on voltage feedback obtained at a predetermined test current value, and to adjust the drive current in normal operating mode according to the estimated device degradation to implement constant lumens control without external optical feedback components.