A generalized Undeland snubber for flying capacitor multilevel inverter and converter

This paper proposes a snubber circuit for a flying capacitor multilevel inverter and converter. The proposed snubber circuit makes use of the Undeland snubber as a basic snubber unit. It has the advantages of the Undeland snubber used in the two-level inverter. Compared with the conventional RLD/RCD snubber for a multilevel inverter and converter, the proposed snubber keeps such good features as fewer number of components, reduction of voltage stress of main switching devices due to low overvoltage and improved efficiency of system due to low snubber loss. In this paper, the proposed snubber is applied to a three-level flying capacitor inverter and its feature is demonstrated by computer simulation and experimental results