大功率LED灯具翅片式散热器结构分析与优化

Structure Analysis and Optimum of Fin Type Heat Sink for High Power LED Lamps

针对当前大功率LED对散热要求高的特点,提出1种翅片式散热器结合空气导流散热技术以满足LED灯具散热的结构。在给定的环境温度条件下,通过有限元(FEM)数值模拟的方法研究芯片温度随散热翅片数量、散热体材料、空气流动速度变化的规律。结果表明,增加翅片数量,使用导热率更高的材料以及加大空气的流速均能有效降低LED的工作温度。有限元方法作为重要的计算机辅助研究工具,为大功率LED灯具散热结构的分析与优化提供了更加经济、有效、便捷的研究手段。

In consideration of the strict temperature control of high power LED,a fin type heat sink working together with the air convection are proposed as the heat emission structure for LED lamps.As the ambient temperature remains constant,Finite Element Method（FEM）is used to investigate the variation rules of the LED temperature under the influence of the fins number,the material of heat sink and the air velocity respectively.The results show that increasing the fin number,using materials with higher thermal conductivity and increasing air velocity could improve cooling effect of high power LED.The FEM method is an important computer-aided research tool,which provides a more economic,effective and convenient way for the thermal analysis and optimization of high power LED lamps.