A bi-directional Z-source converter operating with small inductor at wide-range load

This paper presents a topology of bi-directional Z-source converter based on improved Z-source inverter, which can operate with small inductor at wide-range load and realize low capacity voltage stress. Meanwhile, it inherits merits of limitation of inrush-current at startup and the same voltage gain which improved Z-source inverter has. By controlling the additional switch properly, the proposed Z-source converter can eliminate abnormal operation state and work on synchronous rectification mode to achieve dual power flow. The operating principle and parameters design of the proposed converter have been analyzed. Simulation results are presented to verify the validity of analysis for the proposed Z-source converter.