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. 06, 2015
Filed:
Nov. 18, 2010
Chung Ping Kevin Lo, Hong Kong, CN;
Kwok Hung Poon, Hong Kong, CN;
Wa-hing Leung, Hong Kong, CN;
Kam Wah Siu, Hong Kong, CN;
Chung Ping Kevin Lo, Hong Kong, CN;
Kwok Hung Poon, Hong Kong, CN;
Wa-Hing Leung, Hong Kong, CN;
Kam Wah Siu, Hong Kong, CN;
Huizhou Light Engine Ltd., Huizhou, Guangdong, CN;
Abstract
A circuit for driving a light emitting diode (LED) comprises: an alternating voltage power supply, comprising a triac dimmer having a firing angle and output terminals that provide power to the LED; a zero crossing detector that detects a polarity change of the alternating voltage provided by the alternating voltage power supply and provides a zero crossing output signal indicative of the zero crossing; a timer triggered by the zero crossing output signal that generates a timer output signal during a time period of the timer; and LED power circuitry that reduces current to the light emitting diode based upon timing characteristics of the timer output signal.