DC-link Voltage Optimization of the Resonant-Type Repetitive Pulsed Power Supply for the Charging Loss Reduction

DC-link voltage between the PFC and DC-DC stage is a promising degree of freedom for the efficiency improvement in the repetitive pulsed power supply. In this paper, the DC-link voltage range is firstly obtained with the constant power (CP) operation and the required repetitive frequency satisfied. Secondly, the overall charging loss of the series-parallel resonant converter (SPRC) is derived in detail. Accordingly, the derived model is applied to optimize the DC-link voltage to reduce the entire charging loss. Efficiency improvement is observed in both the theoretical and experimental results.