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:
Jan. 31, 2012
Filed:
Jul. 16, 2009
Bin Zhao, Irvine, CA (US);
Jack W. Cornish, Foothill Ranch, CA (US);
Brian B. Horng, Irvine, CA (US);
Andrew M. Kameya, Irvine, CA (US);
Kenneth C. Kwok, Irvine, CA (US);
Victor K. Lee, Irvine, CA (US);
Bin Zhao, Irvine, CA (US);
Jack W. Cornish, Foothill Ranch, CA (US);
Brian B. Horng, Irvine, CA (US);
Andrew M. Kameya, Irvine, CA (US);
Kenneth C. Kwok, Irvine, CA (US);
Victor K. Lee, Irvine, CA (US);
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
A light emitting diode (LED) system implements a LED driver to drive a set of one or more LED strings. The LED driver includes a voltage source to provide an adjustable output voltage to a head end of each LED string of the set for a first duration and a second duration following the first duration. The LED driver further includes a feedback controller to control the voltage source to adjust the output voltage for the second duration based on a digital code value generated from a minimum tail voltage of one or more tail voltages of the set at a sample point of the first duration. The LED driver further includes a power controller to temporarily enable one or more components of the feedback controller for a sample period of the first duration, the sample period comprising the sample point.