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随着LED输入功率的不断提高,大耗散功率带来的高发热量及要求高的出光效率给LED散热提出了更高的要求。脉动热管与常规的散热技术相比,具有高效、结构简单、传热性能好等优点。本文主要通过板式脉动热管对大功率LED散热实验,对热管壁面温度及LED发光强度随时间的变化特征进行了研究。实验结果分析表明:板式脉动热管对各功率LED都会产生非常显著的冷却效果。随着LED功率的增大,脉动热管的启动时间逐渐减短,热阻也呈下降趋势。在理论方面,通过建立LED板式脉动热管水冷理论模型,发现板式脉动热管的热阻是影响LED结温高低的重要因素。
With the continuous improvement of LED input power, high heat dissipation due to large dissipation power and high light extraction efficiency put forward higher requirements for LED heat dissipation. Pulsating heat pipe compared with the conventional cooling technology, with high efficiency, simple structure, good heat transfer and other advantages. This paper mainly through the plate pulsating heat pipe for high-power LED cooling experiment, the heat pipe wall temperature and LED luminous intensity with time characteristics of the study. Experimental results show that: the plate pulsating heat pipe on the power LED will have a very significant cooling effect. With the increase of LED power, the start-up time of the pulsating heat pipe is gradually reduced and the thermal resistance also shows a downward trend. In theory, through the establishment of LED plate pulsating heat pipe water cooling theoretical model, we found that the thermal resistance of the plate pulsating heat pipe is an important factor affecting the level of LED junction temperature.