混合热网络模型的构建及其结温估计方法  

Construction of Hybrid Thermal Network Model and Estimation Method for Its Junction Temperature

作　　者：王兆萍 信金蕾 杜明星 WANG Zhaoping;XIN Jinlei;DU Mingxing(Tianjin Key Laboratory of New Energy Power Conversion,Transmission and Intelligent Control,Tianjin 300384,China;Chengdong Power Supply Branch,State Grid Tianjin Electric Power Company,Tianjin 300250,China;CPSS)

机构地区：[1]天津市新能源电力变换传输与智能控制重点实验室,天津300384 [2]国网天津市电力公司城东供电分公司,天津300250 [3]中国电源学会

出　　处：《电源学报》2024年第3期30-37,共8页Journal of Power Supply

摘　　要：随着绝缘栅双极晶体管在电力电子系统中的广泛应用,对影响其可靠性的结温的准确获取变得至关重要。然而,模块主要的失效形式之一即焊料层的老化,会对结温产生很大的影响。为精确估计结温,结合2种传统热网络模型Cauer和Foster的优点,研究了2种热网络模型的接口方法,完成两部分模型的结合,将芯片焊料层的老化考虑在内提出了一种混合热网络模型。最后,通过有限元仿真和实验测试与混合热网络模型的计算结果对比,验证了混合热网络模型能够实现准确的结温估计,为模块运行状态的监测提供了依据。With the widespread applications of insulated gate bipolar transistors(IGBTs)in power electronic systems,the accurate acquisition of junction temperature which affects their reliability has become crucial.However,one of the main forms of module failure is the aging of the solder layer,which can have a significant impact on the junction temperature.To accurately estimate the junction temperature,the advantages of two traditional thermal network models(i.e.,Cauer and Foster)are combined in this paper,and an interface method for the two models is studied,so that the combination is completed.The aging of the chip solder layer is taken into account,and a hybrid thermal network model is proposed.Finally,through the comparison of finite element simulation and experimental test with the calculation results of the hybrid thermal network model,it is verified that the hybrid thermal network model can achieve an accurate junction temperature estimation,providing a basis for monitoring the operating status of the module.

关 键 词：IGBT模块 混合热网络模型 结温估计 

分 类 号：TN32[电子电信—物理电子学]