A Study on Cooling of High Power LED Road Lighting Lamps

• Main Authors: Yung-Hsuan Huang, 黃詠萱
• Other Authors: 吳佩學
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/94783151277360854749

碩士 === 大葉大學 === 機械工程研究所碩士班 === 96 === In this research, the cooling performance of a high power light-emitting-diode (LED) road lamp is experimentally investigated. Owing to the dust-proof and water-resistance requirements in the application of road lamps, and the need for energy saving, the cooling design of the road lamp in this study employs heat conduction and natural convection from fins. Besides, in order to reduce thermal resistance, the LED flip chips of the road lamp are mounted directed onto an aluminum substract, which is coated with a layer of silica. This study is mainly concerned about the cooling performance of the heat passage from the aluminum substract to the fins. Experimental results show that the use of higher concentration of the silica coating on the aluminum substract provides better conductivity, which helps heat dissipation from the chip to the heat sink. Although reducing the number of fins increases thermal resistance and the substract temperature, the measured data indicates that the thermal resistance of the road lamp is low enough to ensure sufficient cooling capability and safety chip temperature at the rated operating power. In addition, the measured illuminance data in the whole experimental period shows that each LED light bulb has different degree of deterioration in illumination. Keywords: LED, silica, aluminum substract, fin