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:
Aug. 12, 2014
Filed:
Sep. 21, 2011
Seung Woo Hong, Seoul, KR;
Gye-hyun Cho, Bucheon, KR;
Young-je Lee, Bucheon, KR;
Jae-yong Lee, Seongnam, KR;
Seung Woo Hong, Seoul, KR;
Gye-Hyun Cho, Bucheon, KR;
Young-Je Lee, Bucheon, KR;
Jae-yong Lee, Seongnam, KR;
Fairchild Korea Semiconductor Ltd., Bucheon, KR;
Abstract
A power supply has a TRIAC dimmer, and an AC-DC converter connected to the TRIAC dimmer. The AC-DC converter has a power switch, a bleed switch, and a controller. The controller turns off the bleed switch in a first time duration and turns on the bleed switch in a second time duration. Magnitude of a current of the power switch in the first time duration is larger than magnitude of a current of the power switch in the second time duration. Magnitude of a current of the bleed switch in a third time duration within the second time duration is smaller than magnitude of a current of the bleed switch in a fourth time duration within the second time duration.