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:
Mar. 25, 2014
Filed:
Sep. 07, 2012
Bernd Pflaum, Unterhaching, DE;
Bernd Pflaum, Unterhaching, DE;
Infineon Technologies Austria AG, Villach, AT;
Abstract
A circuit for driving light emitting diodes (LEDs) includes a first semiconductor switch and a freewheeling device coupled between a first supply terminal that provides a supply voltage and a second supply terminal that provides a reference potential. The first semiconductor switch is responsive to a driver signal. An LED and an inductor are coupled in series between a common circuit node of the first semiconductor switch and the freewheeling device and either the first supply terminal or the second supply terminal. A current measurement circuit is coupled to the LED and provides a load current signal which represents a load current passing through the at least one LED. A first feedback circuit includes an on-off controller that receives load current signal and a reference signal.