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This paper proposes a new three-phase series resonant converter. The principle working o f the converter is described analytically in detail for switching frequencies equal to the resonant frequency and for switching frequencies greater than the resonant frequency. Additionally, detailed simulations are performed to analyse the converter. Based on the analysis, design criteria for a 5 kW breadboard are derived. The 5 kW breadboard version of the converter has been built to validate the analytical investigations and simulations experimentally. Moreover, the breadboard is used to investigate the ZVS and ZCS possibilities of the topology and the influence of the deadtime and the switching frequency on the overall elficiency.

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This paper investigates multi-phase series resonant DC-to-DC converters during stationary operation. The principle working of the converter is described in detail for switching frequencies equal to the resonant frequency. Design rules for all components are derived analytically. Additionally, the converter's advantages and disadvantages are discussed and the different topologies are compared with each other.Based on these design rules, a 5 kW / 100 kHz laboratory prototype of a three-phase topology has been built. The prototype is used to verify the analysis experimentally.