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The Thermal and Circuits Design of an LED Bulb Considering Temperature Property  

Song, Sang-Bin (한국광기술원)
Yeo, In-Seon (전남대학교 공과대학 전기공학과)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.56, no.7, 2007 , pp. 1261-1267 More about this Journal
Abstract
Although LEDs have been used in various applications with improving the brightness and luminous efficacy, the electrical and optical characteristics of high power LED varies at different temperature and starting time. In this paper, optimal heat sink and apparatus design were conducted using IR camera and ICEPAK on the LED bulb consisting with fourteen LED array. The temperatures of heat sink and LED device of the designed LED bulb without cooling pan were $74^{\circ}C\;and\;96.8^{\circ}C$, respectively, showing in good themal characteristics. For high efficiency driving circuit of LED array adopted optimal heat sink design, driving circuits of constant voltage and current circuits were suggested and fabricated. As a result the efficacy of all driving circuits showed more than 20 lm/W. Also, the constant current circuits are suitable for signal lamp, hallway lamp, and flash lamp having short operating time(about 30 min). On the other hand, a reading light and indoor lamp having long operating time can be controlled by constant voltage circuit.
Keywords
LED; bulb; thermal design; circuit design; ICEPAK;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
Times Cited By SCOPUS : 0
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