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. 28, 2007
Filed:
Dec. 11, 2003
Ajay Tripathi, Schaumburg, IL (US);
Bernd Clauberg, Schaumburg, IL (US);
Young-kee Min, Elm Grove, WI (US);
Raghuram Narasimhan, Lubbock, TX (US);
Rohit Khetarpal, Lisle, IL (US);
Ajay Tripathi, Schaumburg, IL (US);
Bernd Clauberg, Schaumburg, IL (US);
Young-Kee Min, Elm Grove, WI (US);
Raghuram Narasimhan, Lubbock, TX (US);
Rohit Khetarpal, Lisle, IL (US);
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
The power supply () for LEDs provides power to a LED light source () having a variable number of LEDs wired in series and/or in parallel. The power supply () uses current and voltage feedback to adjust power to the LEDs and provides protection to the LED light source (). A feedback controller () compares sensed current and sensed voltage to a reference signal and generates a feedback signal, which is processed by a power factor corrector () to adjust the current flow through the transformer supplying current to the LEDs. A LED control switch () clamps a peak of the current to the LEDs to provide further protection to the LED light source (). A short/open detection circuit () indicates any detection of a 'LED outage' of the LED light source ().