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|1. (WO2013162288) LIGHT-EMITTING DIODE DIMMING APPARATUS|
|Applicants:||SEOUL SEMICONDUCTOR CO., LTD.
|Inventors:||JUNG, Hye Man
KANG, Hyun Gu
HAN, Sang Wook
SHIN, Jin Cheol
|Title:||LIGHT-EMITTING DIODE DIMMING APPARATUS|
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.