大功率LED相变热沉的传热性能研究

Research on heat transfer performance of phase-change heat sink for high power LED

研制了一种利用相变传热原理进行传热的大功率LED相变热沉。实验结果表明与传统实体热沉相比,相变热沉具有更快的启动性能,随着加热功率的增加,其热阻逐渐减小,并低于传统实体热沉,同时在高加热功率条件下,仍能保持良好的均热性能与轴向导热性能。

Phase-change heat sink,which bas＇ed on the principle of the phase-change heat transfer and used for high power LED,is investigated in this paper. The result of experiment indicated that phase-change heat sink possessed good heat transfer performance and quicker start-up characteristics compared to the traditional solid heat sink. A t the same time ,thermal resistance of phase-change heat sink decreased with the increasing of input power and was smaller than the traditional solid heat sink. Good isothermal performance and axial thermal conductivity of phase-change heat sink were achieved under the high heat power.