Development of an Isolated Converter Module for a High-voltage Pulsed Power Modulator

This paper presents the development of an isolated converter module for a high-voltage pulsed power modulator, where multiple cells composed of capacitors and switches are connected in series to generate high voltage. The module is designed to withstand insulation voltages up to 10 ㎸ for application in high-voltage systems. An LCC resonant converter topology is adopted to achieve soft switching, thereby reducing switching losses at high switching frequencies. Moreover, to minimize conduction losses, the resonant current is shaped into a trapezoidal waveform to reduce the RMS value of the current. Additionally, a voltage sensing method employing a tertiary winding is proposed to enable output voltage control regardless of variations in the output potential. The proposed voltage sensing method is validated experimentally, and the performance of the developed converter module is verified through both simulations and experiments.