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:
Feb. 15, 2011
Filed:
Jul. 14, 2005
Uli Joos, Nonnenhorn, DE;
Christian Voss, Deggenhausertal, DE;
Josef Schnell, Wasserburg, DE;
Jochen Zwick, Markdorf, DE;
Uli Joos, Nonnenhorn, DE;
Christian Voss, Deggenhausertal, DE;
Josef Schnell, Wasserburg, DE;
Jochen Zwick, Markdorf, DE;
Conti Temic Microelectronic GmbH, Nuremberg, DE;
Abstract
A method for controlling electrical light sources, in particular, light-emitting diodes (LEDs) by pulse width modulation of a supply voltage is disclosed, whereby the supply voltage or a parameter dependent thereon, for example the current or the electrical power, is measured and the pulse width is controlled as a function thereof. According to the invention, for the light source a characteristic curve for the brightness is generated as a function of the supply voltage or the parameter dependent thereon and, from the measured supply voltage or the parameter dependent thereon, an actual brightness value is determined with the characteristic curve and is compared with a given brightness value and the pulse width controlled as a function thereof.