Three-phase on-board charger with three modules of single-stage interleaved soft-switching AC-DC converter

This paper proposes a new three-phase on-board charger with three modules of single-phase single-stage interleaved soft-switching ac-dc converter. Each module has single-stage structure with reduced component counts. It achieves ZVS turn-on of all switches and ZCS turn-off of all diodes. Eliminating the low frequency component in the battery charging current, the proposed converter is able to charge the battery with dc current. A balancing control algorithm is proposed to limit the excessive current through each module caused by unbalanced three-phase input voltage. A preliminary prototype of the proposed converter has been built and tested to verify the validity of the proposed concept.