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. 04, 2011
Filed:
Dec. 10, 2007
Yi-mei LI, Nantou County, TW;
Yung-hsin Chiang, Taipei County, TW;
Yi-Mei Li, Nantou County, TW;
Yung-Hsin Chiang, Taipei County, TW;
ADDtek Corp., Songshan District, Taipei, TW;
Abstract
An LED driver circuit that sinks pure DC current through LEDs. According to the invention, a constant current sink circuit is coupled to a full bridge rectifier. The full bridge rectifier includes at least a first bridge arm, a second bridge arm, a third bridge arm and a fourth bridge arm. The first bridge arm and the fourth bridge arm are connected in parallel with the third bridge arm and the second bridge arm in opposite directions, respectively. The connection of the first bridge arm and the third bridge arm and the connection of the second bridge arm and the fourth bridge arm are connected in series. Each of the bridge arms may consist of at least one LED. The constant current sink circuit is used for sinking pure DC current. The LEDs can be driven by pure constant current and can provide desired luminance.