High Repetitive Pulsed Power Modulator Based on IGBT switches for PSII Application

In this paper, a novel new pulse power generator based on IGBT stacks is proposed for pulse power application which can be used for PSII applications. Because it can generate high voltage pulse output without any step-up transformer or pulse forming network, it has advantages of fast rising time, easiness of pulse width variation, high repetition rate and rectangular pulse shape. Proposed scheme consists of multiple power stages which generate maximum 6.8 kV, 300 A output pulse and one series resonant power inverter to charge DC capacitor voltage. Depending on the number of power stages it can increase maximum voltage up to 60 kV without any restriction. Each power stages are configured as 8 series connected power cells and each power cell generates up to 850 VDC pulse. To reduce component for gate power supply, a simple and robust gate drive circuit is proposed. For gating signal synchronization, full bridge inverter and pulse transformer generates on-off signals of IGBT gating with gate power simultaneously and it has very good characteristics of short circuit protection.