A flexible loss-minimizing and stress-sharing switch cell for power converters

A switch cell named split-cell for power converters is proposed. Basically it is composed of two split bridge cells with the same power rating. Two small resonant inductors are introduced to enable zero-voltage-switching (ZVS) operation of the split-cell. An external snubber capacitor can be employed to further reduce turn-off losses of all the switches. With flexible and smooth mode-changing operation, the internal two bridge cells can perfectly share the stresses. Simulations and experiments have been implemented. The results have verified the expected performance for the split-cell. The split-cell can be used in high power and high frequency applications to reduce system losses, stresses, and improve reliability.

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