pc-LED双热源热模型实验研究

荧光粉转换型白光LED（pc-LED）的热模型是LED散热设计的基础。常用的单热源单通道热模型不能表达pc-LED的实际散热过程，已有的双热源双通道热模型的参数测量需要T3ster和红外热像仪，并忽视了环氧胶在蓝光LED照射下的发热现象。为此，文章提出一种采用PT100芯片直接测pc-LED芯片结温和微型热电偶直接测荧光粉温度的方法，并依据实验结果改进了双热源双通道热模型，计算出各热阻值和热流值，揭示了pc-LED的散热规律。实验还发现纯环氧胶在蓝光LED辐照下有发热的现象。

Experimental Research on Dual Heat Source Thermal Model of pc-LED

The thermal model of phosphor conversion white LED (pc-LED) is the basis of LED heat dissipation design. The commonly used single heat source single heat dissipation channel thermal model can not express the real heat dissipation state of pc-LED. The existing dual heat source dual heat dissipation channel thermal model requires T3ster and infrared thermal imager to measure model parameters, and the heat generation phenomenon of epoxy adhesive radiated by blue LED is ignored. Therefore, the method of directly measuring the junction temperature of PC LED chip with PT100 chip and directly measuring the phosphor temperature with micro thermocouple is proposed. According to the experiment, the dual heat source dual heat dissipation channel thermal model is improved, the thermal resistance and heat flow values are calculated, and the real heat dissipation state of pc-LED is revealed, and the direct measurement method and improved model are verified, and the useage of expensive instruments such as T3ster and infrared thermal imager is avoided, The experiment also find that the pure epoxy adhesive also has heat generation phenomenon radiated by blue LED.