철도차량용 고휘도 LED 전조등 방열장치 열해석

Abstract

LED lighting technology has been attracting attention as a next-generation high-efficiency light source in various kinds of lighting such as railway vehicle, automobiles, and indoor and outdoor lighting, which are continuously developing. Railway vehicle headlights are sealed beam and HID, and recently LED headlights are widely used. However, only 20% of LED power is emitted by light, and more than 80% is converted into thermal energy. As a result, it is known that when the temperature rises, the life of the LED drastically decreases. As such, the LED has a fundamental problem of heat dissipation at higher output, and natural convection, forced convection, heat pipe, and liquid cooling technology are being used. Therefore, in this study, we tried to derive the heat dissipation performance and the optimal heat dissipation structure through simulation of the heat dissipation system and the thermal analysis simulation according to the ambient temperature change, which is necessary for the development of the high brightness LED headlight for railway vehicles with a capacity of 300,000 Cd or more. As a result, the temperature distribution of the COB LED and the heat sink can be confirmed that the initial ambient temperature can affect the temperature distribution. Also, it was confirmed that the difference in the temperature distribution due to the COB LED and the heat sink and the initial ambient temperature change is smaller than that of the front ventilation method. Finally, to protect the LED headlight's COB LED and heat sink, it is considered necessary to cool the forced ventilation system rather than the cooling of the natural ventilation system.