Parallel current-fed resonant converter with balance current sharing and no input ripple current

This studies a parallel current-fed resonant converter with the advantages of the balance current sharing and no input ripple current. The basic structure of the developed circuit includes a boost converter and half-bridge resonant converter with the same power switches to reduce switch counts. Two boost-type converters with an interleaved pulse with modulation are used in the front stage to eliminate input ripple current and reduce the size of boost inductor. Parallel resonant converter with magnetic coupling current balancing cell is adopted in the rear stage to automatically balance two resonant circuits and realise the zero-voltage turn-on switching for power devices. The voltage doubler circuit is employed on the secondary-side to achieve high-voltage output. The developed converter can be used for current-type input source and voltage-type output. Finally, experiments with 1 kW laboratory prototype are provided to confirm the feasibility of the proposed converter.