基于热时间常数的IGBT模块热疲劳老化监测方法  

Thermal Fatigue Monitoring Method for IGBT Module Based on Thermal Time Constants

作　　者：余瑶怡 杜雄[1] 张军[1] YU Yaoyi;DU Xiong;ZHANG Jun(State Key Laboratory of Power Transmission Equipment&System Security and New Technology,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室

出　　处：《电源学报》2020年第1期18-27,共10页Journal of Power Supply

基　　金：国家自然科学基金资助项目（51577020）~~

摘　　要：提出利用热时间常数作为新的特征量,实现了对IGBT模块和导热硅脂的热疲劳老化进程的同步监测。通过研究热时间常数与Cauer型热网络参数的关系,建立了热时间常数与IGBT模块物理结构间的联系,总结出热时间常数在IGBT模块热疲劳老化过程中的变化规律。最后,通过3-D有限元仿真模型和实验验证了该方法对监测IGBT模块和导热硅脂热疲劳老化的有效性。该方法的显著优势在于可以仅通过1条结温降温曲线提取热时间常数,且不需要任何损耗信息或加热模块至热平衡状态。In this paper,the thermal time constant is proposed as a novel indicator for monitoring the thermal fatigue of IGBT modules and thermal silicone grease.By investigating the relationship between thermal time constants and the parameters of a Cauer-type thermal network,the connections between thermal time constants and the IGBT module’s physical structure are stablished,and the varying characteristics of thermal time constants in the aging process of IGBT module are summarized.At last,the effectiveness of the proposed method in monitoring the fatigue of IGBT module and thermal silicone grease was verified through a 3-D FEM simulation model and experiments.The obvious advantage of this method is that it can extract thermal time constants using only one junction temperature cooling curve without knowing any power loss information or heating the IGBT module up to a thermal equilibrium state.

关 键 词：IGBT模块 热时间常数 状态监测 热疲劳老化 

分 类 号：TM930[电气工程—电力电子与电力传动]