Two core implementation of coupled inductor for parallel three-phase power converters

Coupled inductors are widely used for parallel operation of three-phase converters. By adding one coupled inductor for each phase, the circulating current between two converters can be effectively suppressed. The conventional structure of the coupled inductor is originated from DC-DC conversion and does not employ any characteristics of 3-phase system. In this paper, an integrated structure of coupled inductors is proposed for 3-phase AC-DC power conversion. According to the differential-mode and common-mode, three coupled inductors can be integrated into two; one for suppressing differential-mode circulating current, the other for common-mode circulating current. The proposed integrated coupled inductors can easily be built with standard shape cores. The validity of proposed integration is verified by an experiment with 2kW paralleled converters. With proposed integration, the total weight of the coupled inductors could be reduced by 30%.

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