Journal of the Korean Institute of Illuminating and Electrical Installation Engineers (조명전기설비학회논문지)

The Korean Institute of IIIuminating and Electrical Installation Engineers (한국조명전기설비학회)
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Evaluation of the Device Temperature and Optical Characteristics in High Power White LED Lamp by Driving Condition

고출력 백색 LED 램프의 구동조건에 따른 온도 및 광 특성 평가

  • 윤장희 (숭실대학교 대학원 전기공학과) ;
  • 염정덕 (숭실대학교 전기공학부)
  • Received : 2011.09.26
  • Accepted : 2011.11.11
  • Published : 2011.11.30
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Abstract

In this paper, the effect of pulse current and generated heat on characteristics of the LED is measured and evaluated. For experiments, the LED driving circuit and digital logic which determines period and duty ratio of lighting are designed. At rated current, the temperature and optical characteristics of the LED with change in duty ratio and period are compared, and those of the LED with change in duty ratio and existence of cooling fan are also compared at constant average current. As a result, frequency does not affect device temperature and optical characteristic of the LED but duty ratio does. Also, the cooling fan is less effective on those of the LED at rated current.

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References

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