Abstract：In this paper,a lumped parameter thermal circuit model is proposed considering the thermal equilibrium principle and the thermal-electrical analogy theory to calculate the operation temperature of power devices with high accuracy.In order to extract equivalent thermal parameters of the proposed model,an experimental platform is designed for measuring the temperature of power devices and the genetic algorithm is employed for thermal circuit model identification.The result shows that the thermal parameters in the lumped thermal circuit model can be identified effectively with the proposed method and the variation law of the thermal parameters with current level and heat sink area can be clearly revealed.Under the condition of known variation law of the parameters,the proposed model can reflect the thermal dynamic process of power devices with high accuracy without obtaining relevant temperature rise profile from experiments.As a consequence,the proposed model is particularly suitable for applying in the occasion where the temperature sensor is difficult to fix and the precision of sensor is prone to drift.
万萌,应展烽,张旭东,吴军基,杨忠浩. 功率器件集总参数热路模型及其参数提取研究[J]. 电工技术学报, 2015, 30(21): 31-38.
Wan Meng,Ying Zhanfeng,Zhang Xudong,Wu Junji,Yang Zhonghao. Research on the Lumped Parameter Thermal Circuit Model and the Parameter Extraction Method of Power Devices. Transactions of China Electrotechnical Society, 2015, 30(21): 31-38.
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