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1. (WO2013162288) LIGHT-EMITTING DIODE DIMMING APPARATUS

Pub. No.:    WO/2013/162288    International Application No.:    PCT/KR2013/003528
Publication Date: Fri Nov 01 00:59:59 CET 2013 International Filing Date: Thu Apr 25 01:59:59 CEST 2013
IPC: H05B 37/02
H05B 33/08
Applicants: SEOUL SEMICONDUCTOR CO., LTD.
서울반도체 주식회사
Inventors: JUNG, Hye Man
정혜만
KANG, Hyun Gu
강현구
HAN, Sang Wook
한상욱
SHIN, Jin Cheol
신진철
Title: LIGHT-EMITTING DIODE DIMMING APPARATUS
Abstract:
Disclosed is a dimming apparatus having a light-emitting unit the illumination level of which changes in accordance with the number of on/off operations of a power switch. A drive current for determining the illumination level of the light-emitting unit is determined by a voltage applied to a drive resistor. The voltage applied to the drive resistor follows a control voltage. The pulse width or duty ratio of a dimming control signal is changed in order to generate and adjust the control voltage. In addition, the dimming control signal can be provided in the form of a digital signal which can turn on/off a transistor. The control voltage according to a resistance ratio is changed by turning on/off the transistor. Accordingly, the illumination level of the light-emitting unit is adjusted in accordance with the number of switching operations.