Aiming at the heat dissipation problem of high-power LED car headlights

For the research of automobile headlight radiator, some achievements have been made at home and abroad. In 2002, General Lighting Electric Co., Ltd. used an array of heat sinks behind the LED module to dissipate heat in its small power LED lamps. Aqkahn et al. used a piezoelectric fan to perform forced convection cooling of LEDs in 2004, and the result was that the cooling method lowered the temperature by 37°C compared with natural convection cooling. A loop heat pipe was used to cool LED street lights. Because the heat pipe has good flexibility, it can conduct fluid heat transfer in a long space, and can be installed at any position according to the designed street lamp. *The last experiment used the micron capillary material as the wick of the loop heat pipe. The result after *shows that the ambient temperature is 35°C, and in the case of natural convection, the surface temperature of the loop heat pipe is 73°C.

In 2005, the micro-channel cooling method was applied to the LED array, and a flat plate made of silicon material or metal matrix composite material MMC was installed under the LED module. The micro-machining method is used under the plate to process the plate into micro-channels, and the fluid is allowed to flow through these channels, and the fluid conducts the heat generated by the LED. The solution of cooling high-power LED array using micro-spray, and numerical optimization of the cooling system. In 2011, the Technical Institute of Physics and Chemistry of the Chinese Academy of Sciences developed an industrial prototype of a high-power LED liquid metal radiator, and produced an industrial prototype of a 200W LED liquid metal radiator, which can ensure the highest temperature on the back of the substrate when the LED light source is operating at full load at room temperature. Below 45°C. The structure and principle of the high-power LED automotive headlight radiator designed above are relatively complicated, and many inconveniences such as difficulty in maintenance will occur in actual application in automotive headlights. In this article, aiming at the heat dissipation problem of high-power LED automotive headlamps, three simple and reliable heat dissipation devices are designed, thermal analysis is conducted through ANSYS, and a suitable heat sink is selected for actual processing, and the feasibility of heat dissipation is verified through experiments. .

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