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设计了三种大功率LED照明装置,并对其二次热沉散热进行了散热原理比较、实验性能分析,建立了热阻网络模型,对其进行了结温计算和寿命预测,发现微热管、薄肋片、风扇可以很好地实现散热。利用正交试验法对LED照明装置结温的影响因素进行了模拟分析,发现自然对流条件下,对流换热系数的影响可忽略不计,而需尽量提高导热环节的热导率并结合其散热能力进行功率的控制。为微热管散热技术提供了技术参考,为大功率LED器件的二次热沉散热提供了有效的实现途径。
Three kinds of high-power LED lighting devices were designed. The principle of heat dissipation of the secondary heat sink was compared and the experimental performance was analyzed. The thermal resistance network model was established, the junction temperature calculation and life prediction were carried out. Fins, fans can achieve good cooling. Using orthogonal test method to simulate and analyze the influence factors of LED lighting device junction temperature, it is found that the convection heat transfer coefficient under natural convection condition is negligible, but the thermal conductivity of the heat transfer link should be increased as much as possible and combined with its heat dissipation capacity Power control. It provides a technical reference for the micro-heat pipe cooling technology and provides an effective way to dissipate the heat of the secondary heat sink of high-power LED devices.