A Novel Three-Phase Single-Stage Isolated AC-DC Converter with Symmetrical Structure for Battery Charger

The single stage AC-DC converter has become increasingly popular in battery charger application for the advantages of high efficiency, high power density and high reliability. To improve the level of power, a novel three phase single stage isolated AC-DC (TPSSI-ACDC) converter with symmetrical structure and corresponding control scheme was proposed in this paper. A compact topology with only six semiconductor devices supplies high frequency pulse voltage for transformer, meanwhile the PFC function comes true. The proportional resonant (PR) controller is used to achieve zero steady-state error to tracking reference value quickly. The performance and the effectiveness of the proposed converter and control scheme are verified by simulation.