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串联IGBT的一种复合均压方法

, PP. 153-158

Keywords: 串联IGBT,RCD缓冲电路,门极平衡核,复合均压

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Abstract:

针对IGBT串联应用时的集射极电压均衡问题,提出并研究了一种门极平衡核与无源RCD缓冲电路相结合的复合均压方案。分析了门极平衡核的均压原理,借助门极驱动等效电路模型,导出了门极平衡核的参数设计方法。在IGBT门极与发射极之间引入瞬态电压抑制器,有效减缓了平衡核变压器的漏感与IGBT输入电容引发的门极信号振荡幅度,同时有效保护了IGBT门极过电压。建立了复合均压方案的仿真与实验系统,实验结果表明,复合均压方案对由于IGBT特性参数差异和门极驱动信号不同步而引起的IGBT集射极电压不均问题具有显著的平衡效果。

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