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:
Jun. 11, 2013
Filed:
Feb. 12, 2010
Kyung Hee YE, Ansan-si, KR;
Hyun Gu Kang, Ansan-si, KR;
Dae Sung Kal, Ansan-si, KR;
Won Cheol Seo, Ansan-si, KR;
Kyung Hee Ye, Ansan-si, KR;
Hyun Gu Kang, Ansan-si, KR;
Dae Sung Kal, Ansan-si, KR;
Won Cheol Seo, Ansan-si, KR;
Seoul Semiconductor Co., Ltd., Seoul, KR;
Abstract
A light-emitting diode (LED) driver used to power at least one LED with an alternating current (AC) voltage source is provided. The LED driver includes a rectifying unit applying N-fold higher voltage than the voltage from the AC voltage source to the LED. The rectifying unit includes a first charging unit to charge a first voltage, and a second charging unit to charge a second voltage. The first voltage includes the voltage at the AC voltage source during a first half-cycle of one AC voltage cycle, and the second voltage includes the first voltage and the voltage at the AC voltage source during the second half-cycle of the AC voltage cycle. Accordingly, the LED driver may improve light-emitting efficiency and reduce flicker of LEDs.