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基于小波奇异熵理论的IGBT模块键合线脱落故障特征分析

, PP. 165-171

Keywords: IGBT模块,键合线,栅极电压,小波奇异熵,故障特征量

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Abstract:

针对目前IGBT功率模块内部键合线故障需要通过复杂辅助电路才能实现识别、监测的难题,本文提出一种根据IGBT模块实时开关波形对键合线故障甚至是并联IGBT芯片故障进行评估分析的新方法。从IGBT模块结构特性入手,分析得出键合线及并联IGBT芯片的故障特性将在模块栅极关断电压的变化上得到体现,然后对未塑封的IGBT模块进行了人为的键合线挑断试验得到了预期的分析处理数据。考虑到IGBT模块从投运至失效过程中的数据信息量极为巨大,需要对大量数据进行有效压缩并挖掘出其中的有用信息。本文采用小波奇异熵理论对栅极电压信号进行了故障特征提取,并比较了不同故障类型对特征量变化的影响。研究成果为实现IGBT模块的健康状态评估提供了重要依据。

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