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:
Apr. 17, 2012
Filed:
Mar. 05, 2009
Chun-tsung Chen, Taipei, TW;
Chun-hsiung Chang, Zhubei, TW;
Tsan-huei Wu, Shuilin Shiang, TW;
Shih-hui Chen, Kaohsiung, TW;
Chun-Tsung Chen, Taipei, TW;
Chun-Hsiung Chang, Zhubei, TW;
Tsan-Huei Wu, Shuilin Shiang, TW;
Shih-Hui Chen, Kaohsiung, TW;
Richtek Technology Corp., Chupei, Hsinchu, TW;
Abstract
A LED driving topology includes a LED array and a current source connected in series between two power inputs receiving a positive voltage and a negative voltage respectively. This topology increases the voltage difference across the LED array and hence has the capability of lighting up more serially connected LEDs, without requiring an additional boost circuit or a high voltage. In addition, the circuit of the current source can be made by a low-voltage manufacturing process.