大功率LED阵列散热结构热分析

在自然对流冷却状态下，不同的散热结构对大功率LED阵列散热性能有显著影响。采用有限元分析法，对不同散热模型进行了分析并得到工作稳定时的热分析图；对比直片形、弧形、弧钉形散热结构的散热效果，逐步得出弧钉形散热结构散热效果最好，使得空腔以及芯片处温度均在合适的范围内，灯具的使用寿命达到近40000h。另外，模拟得出在普通散热设计中，灯具适合的功率约为13．75w。通过有限元法仿真模拟得出较为合理的结果，有效地减少了实验损耗。

Thermal Analysis of High-Power LED Arrays Heat Sink Structure

In the state of natural convection cooling, different heat sink structures have a significant effect on the thermal performance the high - power LED array. Using the finite element method, different heat sink structures are analyzed and the stable temperature distribution is obtained. By comparing straight, arc, and arc nail -shaped heat sink cooling effect, we find out that the nail -shaped heat sink structure has the best cooling effect and it can keep the temperature of the cavity and the chip in an appropriate range and the life time of the luminaire is nearly 40000 hours. In addition, because the straight-shaped heat sink has been used widely, we get the approximate maximum power is 13.75 w in this heat sink structure. Reasonable results are obtained by finite element simulation, and we can save the experimental material at the same time, and the result has some certain guiding significance for the heat sink structure of high-power LED lighting.