Analysis, design and implementation of phase-shifted series resonant high-voltage capacitor charging power supply and its fuzzy logic controller

High-voltage capacitor charging power supply (HV-CCPS) is an important part of the capacitive pulsed power system. This paper mainly focuses on the analysis, design and implementation of HV-CCPS, which employs the phase-shifted series resonant converter (PS-SRC) as topology. When PS-SRC operates at over-resonant state, it has three operation modes. The electric characteristics and boundary conditions of these three operation modes are analyzed in detail. Based on the numerical analysis of the operation mode, which is most suitable for capacitor charging application, the resonant parameters design method is proposed to meet the requirement of constant charging current and high voltage gain of HV-CCPS. Furthermore, because it is hard to derive the accurate mathematical model of PS-SRC, fuzzy logic control strategy of HV-CCPS is proposed to control the charging current. The design and implementation of fuzzy controller is presented. An 8-kV PS-SRC HV-CCPS prototype has been built in laboratory, and experimental results verify the validity and the feasibility of the proposed resonant parameters design method and the charging current control strategy.