基于有限元法的IGBT模块复合材料等效导热率计算研究

Ｒesearch on Calculation Method for Equivalent Thermal Conductivity of Polymeric Composites of IGBT Modules Based on Finite Element Method

摘要:

在柔性直流输电飞速发展驱使下，IGBT 模块日益小型化，其内部发热问题愈加严重，因此，对 IGBT 模块内部 散热问题的研究具有很实际的价值。针对现有材料导热率研究的计算均有相应的局限性问题，采取有限元分析方法 建立 ANSYS 有限元分析模型，研究了复合材料等效导热率计算的方法，对比 Maxwell － Eucken 方程、文献中的试验数 据以及所提方法的计算结果，说明所提方法的可行性。最后利用所提方法，得出了考虑填料的形状、大小、体积分数、 填料颗粒导热率、填料颗粒团聚等因素对复合材料等效导热率的变化规律。

Abstract:

In order to adapt to the development of flexible HVDC transmission technology，IGBT modules are becoming smaller，but the internal heating problem of IGBT modules is becoming more and more prominent． Therefore，the issues related to thermal dissipation of IGBT module packages for further exploration have an important guiding significance and practical value． The numerical calculation has its own scope of application and limitation，and the experimental studies are reliable but high cost． At present，ANSYS finite element method to calculate equivalent thermal conductivity of polymeric composites is seldom reported． Then，the method to calculate equivalent thermal conductivity of polymeric composites is studied based on finite element method． The comparison of Maxwell － Eucken equations，experimental results of reference and the obtained results shows the feasibility of this method． Finally，The change regulations of equivalent thermal conductivity of composites considering the factor of filler shape，size，volume fraction，the thermal conductivity of filler particles，particles agglomeration are obtained．