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:
Nov. 02, 2010
Filed:
Mar. 26, 2008
Bin Zhao, Irvine, CA (US);
Jack W. Cornish, Foothill Ranch, CA (US);
Brian B. Horng, Irvine, CA (US);
Victor K. Lee, Irvine, CA (US);
Andrew M. Kameya, Irvine, CA (US);
Bin Zhao, Irvine, CA (US);
Jack W. Cornish, Foothill Ranch, CA (US);
Brian B. Horng, Irvine, CA (US);
Victor K. Lee, Irvine, CA (US);
Andrew M. Kameya, Irvine, CA (US);
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
Power management in a light emitting diode (LED) system having a plurality of LED strings is disclosed. A voltage source provides an output voltage to drive the LED strings. An LED driver monitors the tail voltages of the active LED strings to identify the minimum, or lowest, tail voltage and adjusts the output voltage of the voltage source based on the lowest tail voltage. The LED driver can adjust the output voltage so as to maintain the lowest tail voltage at or near a predetermined threshold voltage so as to ensure that the output voltage is sufficient to properly drive each active LED string with a regulated current in view of pulse width modulation (PWM) performance requirements without excessive power consumption.