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고출력 백색 LED 램프의 구동조건에 따른 온도 및 광 특성 평가Evaluation of the Device Temperature and Optical Characteristics in High Power White LED Lamp by Driving Condition
- Other Titles
- Evaluation of the Device Temperature and Optical Characteristics in High Power White LED Lamp by Driving Condition
- Issue Date
- Nov-2011
- Publisher
- 한국조명.전기설비학회
- Keywords
- LED; Temperature; Color Temperature; Efficacy; Dimming; LED; Temperature; Color Temperature; Efficacy; Dimming
- Citation
- 조명.전기설비학회논문지, v.25, no.11, pp.33 - 38
- Journal Title
- 조명.전기설비학회논문지
- Volume
- 25
- Number
- 11
- Start Page
- 33
- End Page
- 38
- ISSN
- 1229-4691
- 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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Related Researcher
- Ryeom, Jeong dug
- College of Engineering (School of Electrical Engineering)