Non-isolated-type photovoltaic grid-connected inverter and control method thereof

The present invention provides a non-isolated photovoltaic inverter, comprising a control circuit and a full bridge circuit, wherein an asymmetric full-bridge circuit topology of six H6 switch, the control circuit of the full bridge circuit each switch transmits a control signal to the full bridge circuit so that the DC voltage from the PV array converted sine wave voltage to meet the needs of the grid. While the full-bridge circuit according to the present invention are themselves asymmetric H6 topology may be formed completely disconnect the DC side of the free-wheeling circuit, so as to effectively suppress the generation of the common mode current, and power consumption and uniform distribution of small switch, improved grid inverse the reliability of the device. Further, the present invention also provides a corresponding method of control.