LED Lighting Power Implementation Using AC Chopper Technology by Shin jae-min Department of Electronics & Mechatronics Engineering Graduate School of Industrial Technology & Management Korea Polytechnic University

Abstract
 LED Lighting Power Implementation Using AC Chopper Technology by Shin jae-min
 Advisor : Prof. Choi sung-yun, Ph.D.
Department of Electronics & Mechatronics Engineering Graduate School of Industrial Technology & Management Korea Polytechnic University
 The key point of this paper writing is that the life span of an power supply unit for using the recent DC LED illumination is often mentioned, even though it is the trend that incandescent lamp, fluorescent lamps and illumination for industry are replaced by the low power LED illuminations as a part of alternative activity due to the recent energy exhaustions. The applying of AC LED to drive AC directly without converting AC to DC to overcome the life span of electrolysis condenser for a rectification to be related to the life span of DC LED illumination. Utilize a merit of high efficiency and semipermanent of LED can be substantialized the power supply device which can preserve the life span, not using an electrolysis condenser for a rectification. With this development, using AC Chopper technology can be substantialized the power supply unit for the stable AC LED illumination, and system composition can improve power factors and THD through the controls that used MICOM and it can contribute to commercialize LED illumination with the long life and high efficiency.