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:
Aug. 11, 2015
Filed:
Sep. 23, 2011
Robert Alvord, Elmwood Park, IL (US);
Jim Kopec, St. Charles, IL (US);
Jochen Aicher, Reitheim-Weilheim, DE;
Matthew Schwind, Lisle, IL (US);
Robert Alvord, Elmwood Park, IL (US);
Jim Kopec, St. Charles, IL (US);
Jochen Aicher, Reitheim-Weilheim, DE;
Matthew Schwind, Lisle, IL (US);
Diehl AKO Stiftung & Co. KG, Wangen, DE;
Abstract
An LED-based lighting system is operated with a time-based process. The LEDs are first turned on by energizing the system at full power. After a predetermined time period, which is selected so that the junction temperature of the LEDs does not reach a critical temperature, the current supply is ramped down to a steady-state supply. The steady-state current is maintained as long as the light is turned on. When the light is turned on the next time and the LEDs have not cooled down all the way, as determined by the time that has expired since the LEDs were last lit, the full-power time period is shortened accordingly.