基于平板热管的大功率LED散热系统模拟及优化

摘要

为解决大功率LED的散热问题,设计了平板热管散热器来实现LED芯片的高效散热.通过Flotherm模拟软件,对大功率LED在自然对流条件下的散热情况进行了三维数值模拟.通过平板热管与常规铜、铝散热基板对比,发现平板热管有效降低了大功率功率LED的结温和热阻,使得LED温度分布更为均匀.此外,还研究了平板热管LED散热系统在不同芯片功率下的热性能,并对四种不同排布方式的LED平板热管散热系统进行了优化,发现阵列分布其温度分布最为均匀,结温最低,是较优的排布方式.%Flat heat pipe heat spreader was designed for the heat dissipation of high-power LED. The thermal performance of high-power LED in natural convection conditions was simulated by the Flotherm simulation software. It is found that the flat heat pipe reduces the junction temperature and thermal resistance compared to the conventional copper and alumina heat spreader. The thermal performance of LED with flat heat pipe heat spreader under different heat power conditions was also explored. Furthermore, four types of arrangement of the LED chips were also designed and compared for the optimization. The results indicate that the uniform array configuration induces the best uniform temperature distribution and the lowest junction temperature, and seems to be the optimum choice for high-power LED.