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. 28, 2012
Filed:
Nov. 30, 2009
Hyo Young Kim, Suwon-si, KR;
Sung Hun OH, Suwon-si, KR;
Jin Hwan Kim, Suwon-si, KR;
Jong Rak Kim, Suwon-si, KR;
Hyo Young Kim, Suwon-si, KR;
Sung Hun Oh, Suwon-si, KR;
Jin Hwan Kim, Suwon-si, KR;
Jong Rak Kim, Suwon-si, KR;
Samsung Electro-Mechanics Co., Ltd., Suwon, KR;
Abstract
The present invention relates to a light emitting device (LED) driving apparatus that constantly maintains the average current flowing onto a plurality of channels. The light emitting device (LED) driving apparatus includes: a LED light source unit in which at least one LED channel is connected in parallel; at least one current detector that is disposed on a low end of a LED channel of the LED light source unit to detect the current flowing onto respective LED channels; at least one channel current controller that generates control signal controlling the average current of the channels by comparing current detected from the channels with reference wave; and a switching element that controls the average current of the LED channels in a PWM scheme according to the control signals.