Invention Grant
- Patent Title: LED lighting device
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Application No.: US15721898Application Date: 2017-09-30
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Publication No.: US10206256B2Publication Date: 2019-02-12
- Inventor: Myeong-Kook Gong , Kyung Ho Yoo , Kil Ho Choo , Jong Il Kim , Young June Lee , Seung Jong Han , Yong-Wook Cho
- Applicant: LUMENS CO., LTD.
- Applicant Address: KR Yongin-si
- Assignee: LUMENS CO., LTD.
- Current Assignee: LUMENS CO., LTD.
- Current Assignee Address: KR Yongin-si
- Agency: Mei & Mark LLP
- Priority: KR10-2013-0012835 20130205; KR10-2013-0056432 20130520; KR10-2013-0056433 20130520; KR10-2013-0056435 20130520; KR10-2013-0056436 20130520; KR10-2013-0056437 20130520; KR10-2013-0084812 20130718; KR10-2013-0084814 20130718; KR10-2013-0084816 20130718
- Main IPC: H05B33/08
- IPC: H05B33/08 ; H05B37/02

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 Nth switch is connected to the rear end of an Nth LED channel so as to control an operation of the nth LED channel, and is controlled by a sum of a current of the Nth switch and a current of an (N+1)th 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 Nth switch and the (N+1)th switch substantially same, and N is a positive integer.
Public/Granted literature
- US20180027617A1 LED LIGHTING DEVICE Public/Granted day:2018-01-25
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