压接式IGBT模块的动态特性测试平台设计及杂散参数提取

压接式IGBT模块具有散热性能好、杂散电感小、短路失效直通等特点,在柔性直流输电等大容量电力电子变换系统中具有极为重要的应用潜能。然而,目前学术界和工业界尚未很好地理解压接式IGBT模块的动态开关特性,严重制约了其推广应用。从压接式IGBT的封装结构和电气特性出发,基于双脉冲测试原理,设计并搭建压接式IGBT模块的动态开关特性测试平台。采用Ansoft Q3D软件对测试平台的杂散参数进行仿真,分析杂散参数的分布特征、影响与提取方法,并通过实验进行验证,揭示叠层母排技术与吸收电容对器件关断电压尖峰的抑制作用,低寄生电感总和验证了平台设计方案的合理性。

Dynamic Switching Characteristics Test Platform Design and Parasitic Parameter Extraction of Press-Pack IGBT Modules

Press-pack IGBT modules have great potential applications in the field of large capacity power electronic conversion systems such as voltage-source-converter-based high-voltage-direct-current (VSC-HVDC), due to their excellent characteristics of good heat dissipation, low stray inductance, short circuit failure mode and so on. However, their dynamic switching characteristics have been not clearly illustrated, which has deeply restricted their industrial application. In this paper, a dynamic switching characteristics test platform for press-pack IGBT modules was designed and implemented, where the principle of double pulse test was employed. Then through Ansoft Q3D, the extraction method, distributions and impacts of the parasitic parameters were explored. Moreover, the extracted parasitic parameters were validated by experimental results. It is shown that the laminated busbar technology and the snubber capacitors can effectively reduce the device turn-off voltage overshoot and provide the reasonability of the test platform design.