A high voltage switch (50kV 2kA) with IGBTs in series driven by displacement current has been developed. Displacement current, which is generated when the master stage is turned on, drives other stages of the high voltage switch. This method avoids the problems of increasing the turn-on time of the high voltage switch because the displacement current flows in series through those stages and drives them simultaneously. To increase the stages driven by this methods, we have increased the displacement current with improved driving method. In the improved driving method, first, the master stage makes the second stage turn on with the sub-capacitance between second stage and ground, next the displacement current generated with the master stage and the second stage makes other stages turn on. With increased displacement current, switching operation under conditions of 50kV and 2kA is obtained with 56 IGBTs' stages in series. Clamp circuits with Zener diodes are adopted to the high voltage switch and it is shown that these clamp circuits are effective to protect IGBTs from overvoltage in this switch.
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