Abstract
It is possible to produce a high voltage power converter by connecting the power semiconductor elements in series. However, simulations conduction at turn-on and simultaneous blocking at turn-off are unattainable because of the difference of their switching characteristics. Therefore, the series connection of semiconductor devices is very difficult in terms of control and protection. Generally for series connection, larger snubber capacitors are needed, which result in more losses and longer commutation times. This paper propose a novel algorithm which is able to implement not only the synchronization of the points of turn-on and turn-off time, but the dynamic voltage balancing in spite of the difference of switching characteristics. The proposed method is that the compensated control signals are attained from voltage feedback signals and applied to the series-connected power semiconductors independently. Computer simulation and experimental results verify its validity.
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