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:
Sep. 10, 2013
Filed:
Oct. 14, 2010
Steven M. Barrow, Longmont, CO (US);
James H. Masson, Boulder, CO (US);
Daniel R. Herrington, Fort Collins, CO (US);
Irwin R. Nederbragt, Brighton, CO (US);
Chi Yuen Lai, Tuen Mun, HK;
Steven M. Barrow, Longmont, CO (US);
James H. Masson, Boulder, CO (US);
Daniel R. Herrington, Fort Collins, CO (US);
Irwin R. Nederbragt, Brighton, CO (US);
Chi Yuen Lai, Tuen Mun, HK;
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A method includes receiving a sense signal having multiple pulses, where the sense signal is based on an output of a dimmer. The method also includes, for each of multiple sampling periods, sampling a subset of the pulses in the sense signal during that sampling period. The method further includes generating a holding current for the dimmer during the sampling of the subset of pulses in at least one of the sampling periods. In addition, the method includes, for each of the sampling periods, generating an output value identifying a duty cycle for driving one or more light emitting diodes (LEDs). The subset of pulses in each of the sampling periods includes multiple pulses during that sampling period but not one or more initial pulses at a beginning of that sampling period.