Lumped Parameter Model of Cockcroft-Walton Voltage Multiplier in Resonant Converters

This paper proposes a lumped parameter model for Cockcroft-Walton voltage multiplier (CWVM) circuits in resonant converters. The proposed model converts the CWVM circuits to ideal rectifiers and two lumped capacitors. This can reduce the analysis error caused by the resonance between the resonant inductors and CWVM capacitors. Also, the number of converter components can be reduced by utilizing the lumped capacitors as resonant capacitors. The accuracy and applicability of the proposed model are demonstrated through PSIM simulation. For the practical use of the proposed model, the design and implementation of an LCC resonant converter, which is suitable for high step-up applications, are presented. The experimental results from the 5kW and 10kV LCC resonant converter are shown to verify the proposed works.