Single stage insulated bidirectional DC/AC converter with phase shift modulation, design and control

A bidirectional DC/AC insulated single stage converter with high efficiency is proposed. It is dedicated to the connection of batteries to single phase grid. Modulation, design and experimental results with a 500W prototype converter are shown. The converter is composed of one rectifier single phase bridge, two active bridges, a series resonant circuit, and an HF transformer to connect and insulate the battery of the grid. Bidirectional power is obtained using phase shift modulation with fixed frequency. Also, with the proposed modulation, unity power factor is obtained with Zero Voltage Switching (ZVS) in all MOSFETs. Finally, the functionality of proposed converter is validated experimentally.