Non-isolated inverter topologies have obtained more attentions in photovoltaic （PV） generation system since they are featured by higher efficiency and lower cost. In order to meet the safety requirement for the non-isolated grid-tied PV inverter, the common-mode leakage current is required to be carefully tackled due to the absence of the transformer. A H6 non-isolated full bridge PV grid-connected inverter is proposed to meet the limit for common-mode leakage current in grid-tied PV generation systems, as shown in Fig. 1.