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为解决由器件驱动信号不一致引起的多个IGBT串联电压不均衡问题,以实现串联IGBT在大功率高电压场合中的应用,笔者结合功率侧和栅极侧IGBT串联均压辅助电路的优点,提出一种基于增强密勒效应的IGBT串联有源均压辅助电路,并对其工作原理进行了论述。然后,建立IGBT串联仿真电路,对不带和带该均压辅助电路两种情况进行仿真。仿真结果表明,该均压辅助电路在IGBT串联运行时不仅能够很好地抑制IGBT驱动信号不一致造成的电压不均衡,而且能够有效防止过电压的发生,确保了IGBT串联的安全运行。
In order to solve the problem of unbalanced IGBT series voltage caused by the inconsistent drive signals of the devices and to realize the application of series IGBT in high-power high-voltage applications, the author combines the advantages of IGBT series voltage equalization auxiliary circuits in power side and gate side A kind of auxiliary circuit of IGBT series active voltage equalizer based on the enhanced Miller effect and its working principle are discussed. Then, IGBT series simulation circuit is established to simulate the two cases without or with auxiliary circuit. The simulation results show that the voltage-sharing auxiliary circuit can not only suppress the unbalanced voltage caused by the inconsistent IGBT driving signals well when IGBT is connected in series, but also can effectively prevent overvoltage and ensure the safe operation of IGBT in series.