Pulsed power modulator using high voltage static induction thyristor

Using a high voltage static induction thyristor (SI-Thy), we made a pulsed power modulator. The pulsed power modulator consists of a Blumlein line and a pulse transformer with amorphous cores. To evaluate the performance of the SI-Thy, the rise time of voltage pulse and the energy transfer efficiency from the pulse forming line to a matched load resistor were measured, changing turn-on gate voltages and charging voltages of the pulse forming line. The rise time of output voltage is decreasing with turn-on gate voltage. When a turn-on gate trigger voltage of 100V was applied, the rise time less than 90ns was attained for the charging voltage of 5000V. The energy transfer efficiency is increasing with turn-on gate trigger voltage and the efficiency higher than 90% was obtained for the charging voltage of 5000V under the condition that the turn-on gate trigger voltage is 100V.