Practical design methodology for a new three-phase dc-dc fully resonant converter employing LCC-type tank circuit

In this paper, a practical design methodology for a new configuration of a three-phase fully-resonant, dc-dc converter, employing an LCC-type tank circuit with a capacitive output filter is proposed. The newly developed topology has several advantages including operation in Zero Voltage Switched (ZVS) mode, suitability for high power, high frequency, high voltage applications, voltage boosting capability, narrow control frequency range and reduced component size and cost. The design procedure involves sine-wave approximation for the waveforms and only fundamental components are considered. This allows a simple, yet accurate, analysis in the frequency domain. Based on this analysis, a design procedure for the proposed converter is developed which gives a clear insight into design compromises and component selection. A design example is given.