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. 07, 2012
Filed:
Nov. 30, 2009
Wen-tien Tsai, Pingtung County, TW;
Bing-chwen Yang, Hsinchu County, TW;
Hwei-shung Chong, Taoyuan County, TW;
Chung-yue Chen, Taipei, TW;
Yie-tone Chen, Taipei County, TW;
Yao-te Huang, Changhua County, TW;
Li-ling Lee, Hsinchu County, TW;
Wen-Tien Tsai, Pingtung County, TW;
Bing-Chwen Yang, Hsinchu County, TW;
Hwei-Shung Chong, Taoyuan County, TW;
Chung-Yue Chen, Taipei, TW;
Yie-Tone Chen, Taipei County, TW;
Yao-Te Huang, Changhua County, TW;
Li-Ling Lee, Hsinchu County, TW;
Industrial Technology Research Institute, Hsin-Chu, TW;
Abstract
A light adjustment circuit for alternating-current light emitting diodes (AC-LED's) connected to an AC power supply and a plurality of AC-LED's comprises: a light adjustment unit, being capable of modulating AC power from the AC power supply while providing the plurality of AC-LED's with the modulated AC power; and a pulse width modulation (PWM) control circuit, being capable of modulating an external voltage signal in correspondence to variation in input AC power to enable each of the AC-LED's to achieve a predetermined brightness; wherein the AC-LED's are turned off by modulating the external voltage signal to prevent the AC-LED's from being burnt out when the input AC power is too high.