大功率LED的热阻测量与结构分析

Thermal Resistance Measurement and Structure Identification for High-Power LED

热阻的精确测量与器件结构分析是设计具有优良散热性能的大功率LED的前提。本文研究了大功率LED的光功率、环境温度和工作电流对热阻的影响规律,论述了积分式结构函数和微分式结构函数的推导过程及其主要性质,提出了大功率LED热阻的精确测量方法,并利用结构函数分析及辨识大功率LED器件的内部结构、尺寸、材料、制造缺陷和装配质量。

The precise measurement of thermal resistance and structure identification are elements in designing high-power LED with good thermal conductivity. By studying the relationship between the thermal resistance and the optical power, ambient temperature as well as drive current of high-power LED, the generation of cumulative and differential structure functions and their main characteristics were discussed, and the precise method of measuring thermal resistance for high-power LED was proposed. The inner-construction details of high-power LED, such as dimension, material, manufacture defects and assembly quality, were also analyzed and identified by the structure functions.