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老化试验条件下的IGBT失效机理分析

DOI: 10.13334/j.0258-8013.pcsee.2015.20.022, PP. 5293-5300

Keywords: IGBT老化,失效机理,功率循环,结温计算,热阻监测

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Abstract:

IGBT模块失效机理是变流器可靠性状态监测的基础,通过分析模块老化失效机理,得到饱和压降Uce补偿模型和结温Tj计算模型,建立IGBT模块功率循环实验平台,验证模块失效的物理过程和机理,得到IGBT模块在老化过程中电气和热参数的变化趋势,并建立热阻的退化模型,分析不同工作条件下对模块老化的影响。试验结果表明,模块在交变温度下焊接层失效是模块的主要失效方式,失效过程中其特征参数热阻满足参数退化模型,结温差越大模块越容易发生失效。通过IGBT模块的老化实验分析器件的老化机理,为变流器的状态监测和运行可靠性评估奠定一定基础,也为功率器件的可靠性设计提供决策支持。

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