Analysis and Design of High Voltage Resonant Converter Operating in Discontinuous Current Mode

In order to illustrate the resonant process of the LCC resonant converter in discontinuous current mode (DCM) and simplify its design the time domain model of the converter is derived, and a new approach to resonant parameter design is proposed in this paper. The approach reveals the relationship between the resonant parameters and the characteristic parameters of the circuit. First, the resonant process of the resonant converter in DCM has been studied and the mathematical model of the converter in time domain is derived accordingly. Based on this model, the circuit characteristics of the converter are analyzed. Then, the parameters design is proposed, considering the relationship between the ratio of capacitance in series and parallel versus voltage gain and resonant parameters. Simulation using Cadence and experimental verification has been completed with a 7kV12kW prototype.