应用于大功率LED器件的回路热管散热研究

为解决大功率LED的散热问题,提出一种应用于大功率LED散热的微型回路热管,研究了充液率和倾斜角度对热管冷却大功率LED的启动性能、结温和热阻等特性的影响.研究结果表明:热管的最佳充液率为60％,系统的总热阻为7.5 K/W,此时对应的热管的热阻为1.6 K/W;热管的启动时间约为6.5 min,LED的结点温度被控制在42℃以下,很好地满足了大功率LED的结温稳定性要求.

Research on Heat Dissipation of Loop Heat Pipe for High Power LED Device

In order to solve the problem of cooling of high power LED,a miniature loop heat pipe heat sink was designed.The thermal capabilities of the high power LED,including start-up performance,junction temperature and thermal resistance were investigated experimentally under the conditions of different filling ratio and incline angles.The obtained results indicate that the optimum filling rate of the heat pipe is 60％,the total thermal resistance of the system is 7.5 K/W,and the thermal resistance of the loop heat pipe is 1.6 K/W correspondingly.The start-up time of the loop heat pipe is about 6.5 min with the input power of 5 W,the junction temperature of the high power LED can be controlled steadily under 42 ℃,which satisfies the requirements of thermal stability of high power LEDs.