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针对大功率变流器开关模块的选择,以车载双向Buck/Boost变换器为依托,分析不同电压、电流等级的IGBT模块的可靠性.以器件手册为参考,采用曲线拟合结合参数修正的方法,计算不同IGBT、反并联二极管的损耗.根据模块的结温情况,利用线性疲劳损伤积累器件可靠性模型,预测采用不同开关模块变流器的可靠性.结果表明,同等情况下,相同电流容量的模块,电压等级越高,其平均结温和结温波动幅值越大,可靠性越低;相同电压等级模块,电流等级越大,其平均结温和结温波动幅值越小,可靠性越高.依据可靠性预测的方法选择大功率开关模块,可以优化变流器设计,提高整体可靠性,具有一定的工程应用价值.“,”To better choose switching power modules used in high power converters,this paper analyzes the reliability of IGBT modules with different ratings based on bi-directional Buck/Boost converter used in electric vehicles.On the basis of device manual,the losses of different IGBT modules including IGBT and its parallel diode were calculated based on the curve fitting and parameter correction method.According to the junction temperature,the converter reliability of power module with different ratings is evaluated by the linear accumulation of fatigue damage model.Consequently,for the modules with the same current capacity,the higher the voltage grade,the higher the average temperature and temperature fluctuation are,which leads to lower reliability.On the contrary,as for modules with the same voltage grade,the higher the current level,the smaller the average temperature and temperature fluctuation are,which guarantees a high reliable performance.In the selection of high-power module,reliability prediction methods can optimize the design of the converter,which improves the overall reliability and has a certain engineering application value.