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A generalized Undeland snubber for flying capacitor multilevel inverter and converter

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4 Author(s)
In-Dong Kim ; Dept. of Electr. Eng., Pukyong Nat. Univ., Busan, South Korea ; Eui-Cheol Nho ; Heung-Geun Kim ; Jong Sun Ko

This paper proposes a snubber circuit for a flying capacitor multilevel inverter and converter. It also explains the concept of constructing a snubber circuit for a multilevel inverter and converter. The proposed snubber circuit makes use of an Undeland snubber as a basic snubber unit, and thus can be regarded as a generalized Undeland snubber for a flying capacitor multilevel inverter and converter. It has such an advantage of Undeland snubber used in the two-level inverter. Compared with a conventional RLD/RCD snubber for 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 features are in detail demonstrated by computer simulation and experimental result.

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:51 ,  Issue: 6 )

Date of Publication:

Dec. 2004

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