Thermal Characteristics of the Optimal Design on 20W COB LED Down Light Heat Sink

Abstract

Abstract As the demand of the LED for lighting that emits light by p-n junction is increasing, studies on heatproof plate technology is being conducted to minimize the temperature of the LED lighting. As for the temperature of the LED devices, their light emitting efficiency decreases and the maximum lifespan drops down to 1/5. Therefore there are heat dissipation studies going on to minimize the heat. For LED heat dissipation, aluminum heat sink plates are mostly used. For this paper, we designed heat sink that fits residential 20W COB LED Down Light; packaged the heat sink and 20W COB and analyzed and evaluated the thermal properties through a Solidworks flow simulation. We are planning to design the optimal heat sink plate to solve the thermal agglomeration considering TIM(Thermal Interface material). Key words : Heat sink, Solidworks Simulation, LED, Junction Temperature, Optimum Design 1. I NTRODUCTION Due to the increased efficiency and decreased price of the current Light emitting diode (LED) semiconductor, the use of lighting fixtures is growing. The LED lighting fixtures developed for study has been commercialized solving the heat dissipation problem, but as the social demand for high capacity increases, the single heat capacity of semiconductor element is getting larger and various ways to solve heat problems have been proposed. When converting electrical energy into light energy, heat is generated. Such heat and LED’s heat dissipation are important factors to consider when improving the operation of LED and its reliability [1-2]. In general, high power Chip on Board (COB) LED lighting uses the heat sink made of aluminum with insulation area expansion pins installed in it as a cool system dissipating heat on PCB. [3-4]. In order to develop a cooling system, the target amount of dissipation, the environment and possible temperature must be set; and the prediction of heat transfer coefficient and the design of the cooling system should be made[5-6]. In this paper, we will design a heat sink plate for 20W COB LED down light and look at the thermal properties through a Solidworks Flow simulation.