An Analysis of IGBT Connected in Series under Active Voltage Control

This paper describes an active voltage control for IGBT connected in series. The gate drive circuit not only amplifies the control signal, but also control the IGBT's dv/dt and over voltage during switching transient. This make the switching performance less dependent on IGBT itself. This paper provides a stability analysis to judge the controller stability. The experiment results show the IGBT voltage banlancing under active voltage control.