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热阻网络法在传统热阻定义的基础上,简化了系统的计算模型。文章在分析半导体照明系统内部各器件热阻的基础上,提出了一种计算各点温度的热阻网络模型。利用一维热阻网络拓朴关系进行了热场的计算和分析,并与有限元仿真结果进行了对比。通过验证表明,采用该方法得到的结点温度与有限元仿真的结果相差不超过5%,模拟结果与热阻网络模型预测的结果吻合得很好,显示该模型具有较高的精确度。这种热阻网络拓朴分析技术可在某种程度上应用于发光二极管(LED)组件甚至复杂的照明系统的热学分析。
The thermal resistance network method simplifies the calculation model of the system based on the traditional definition of thermal resistance. Based on the analysis of the thermal resistance of each device in the semiconductor lighting system, this paper presents a thermal resistance network model for calculating the temperature of each point. The thermal field is calculated and analyzed by using the topology of one-dimensional thermal resistance network, and compared with the finite element simulation results. The results show that the junction temperature obtained by this method does not differ by more than 5% from the finite element simulation results. The simulation results agree well with those predicted by the thermal resistance network model, which shows that the model has higher accuracy. This thermal resistance network topology analysis technique can be used to some extent in the thermal analysis of light emitting diode (LED) components and even complex lighting systems.