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:
Mar. 13, 2018
Filed:
Aug. 24, 2016
Lumens Co., Ltd., Yongin-si, Gyeonggi-do, KR;
Myeong-Kook Gong, Yongin-si, KR;
Kyung Ho Yoo, Yongin-si, KR;
Kil Ho Choo, Suwon-si, KR;
Jong Il Kim, Uiwang-si, KR;
Young June Lee, Yongin-si, KR;
Seung Jong Han, Seoul, KR;
Yong-Wook Cho, Yongin-si, KR;
LUMENS CO., LTD., Yongin-si, KR;
Abstract
A light emitting diode (LED) lighting device includes a circuit for receiving an input power from a power source and outputting a rectified power, an LED unit including a plurality of LED channels connected in series, each LED channel having a front end and a rear end, a current sensing resistor, and a switch circuit unit. The switch circuit unit includes a plurality of switches, and an Nswitch is connected to the rear end of an NLED channel so as to control an operation of the nth LED channel, and is controlled by a sum of a current of the Nswitch and a current of an (N+1)switch, which flows through the current sensing resistor. Forward voltages of the LED channels are unevenly redistributed so as to keep power consumption between the Nswitch and the (N+1)switch substantially same, and N is a positive integer.