摘要
LED结温高一直是大功率LED发展的技术瓶颈,随着单位热流密度的不断攀升,在自然冷却条件下,单纯的直肋热沉散热方式已不能满足散热要求。应用热管技术设计了热管散热系统,对该系统的传热机理和传热路线进行分析,建立该系统对应的热网络模型,对各部分热阻进行分析与计算,求得总的理论总热阻,计算得出理论结温;同时应用有限元方法对该系统进行仿真分析,对LED模块(0.025m×0.025m×0.005m)输入30W电功率,得出其仿真结温稳定在58.19℃,满足结温小于65℃的要求,说明应用热管的散热系统满足设计要求。由热阻网络模型计算得出的理论结温为57.43℃,与仿真结果相差0.76℃,其误差仅为1.31%,验证了理论分析计算的正确性,对实际工程中热设计具有指导意义。
ment of can not dissipati and the ： High junction temperature of LED has been the technical bottleneck of high power LED. With the rising of heat flux density, the simple straight meet the requirement of heat dissipation in natural cooling conditions. We on system based on the heat-pipe technology, analyzed the heat transfe route of heat dissipation ,then established the model of thermal network the develop- fin heat sink set up a heat r mech accord the physical model and calculated the thermal resistance of each part, finally got the total anlsm ing to theo- retical thermal resistance and the LED junction temperature. At the same time, we made a simulation analysis of this heat dissipation system by using the finite element method. Simula- tion results of the LED module（0. 025 m×0. 025 m×0. 005 m） with 30 W input power show that the junction temperature of LED stable is at 58.19℃, less than 65℃ which is the deadline of requirement. The cooling system applying the heat pipe meets the requirement of design well. The theoretical junction temperature calculated hy thermal model is 57.43 ℃, only 0.76 ℃ less than the simulation result, implying the error is only 1.31% ,this validates the theoretical analysis calculation ,which has guiding significance for practical engineering design.
出处
《应用光学》
CAS
CSCD
北大核心
2012年第6期1014-1018,共5页
Journal of Applied Optics
基金
国家自然科学基金(61107039)
黑龙江省自然科学基金(F201006)
关键词
散热
热管
大功率LED
有限元
heat dissipation
heat pipe
high power LED
finite element
