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방열특성 제어를 위한 PWM 전류제어 기반 LED 모듈 개발
이승현(Seung-Hyun Lee),문한주(Han Joo Moon),허성범(Seong-bum Hue),최성대(Seong-Dae Choi) 한국기계가공학회 2015 한국기계가공학회지 Vol.14 No.6
This paper shows significant methods that improve the lifespan of LED modules as well as efficiently using an aluminum heat-sink for LED module in high power. It proposes a method that raises stability and lifespan to protect LED modules and the power unit when the LED module has been used for a long hours at high temperatures. During the research, we applied a method of pulse-width modulation (PWM) in order to prevent the phenomenon that the entire power of a system is turned off and the lifespan is reduced when the LED nodule reacts to the high temperatures. To protect the LED module and SMPS based on high efficiency, a temperature sensor is attached underneath the circuit board and the sensor measures the temperature of circuit board when the LED module is powered on. The electrical power connected to SMPS is controlled by PWM when the temperature of the LED module reaches a particular temperature.