Abstract：To eliminate the leakage current of single-phase non-isolated photovoltaic inverter，a six-switch

photovoltaic inverter topology with low leakage current was proposed. The topology consists of a voltage multiplier

circuit，a common ground three-level inverter circuit and a LC output filter circuit. The combination of voltage

multiplier circuit and three-level circuit effectively improves the utilization of DC-link voltage. In addition，the

leakage current could be completely eliminated through the common ground treatment of the DC side and AC side

of the inverter. For the proposed new single-phase non-isolated photovoltaic inverter，a new sine pulse width

modulation（SPWM）scheme and a method for selecting flying capacitors were proposed by analyzing the

operating modal of the circuit topology. A prototype with an output of 100 W was designed，and the correctness of

the theoretical analysis was verified by simulation and experiment.

      Key words：photovoltaic power generation；single-phase inverter；leakage current；non-isolated；common

ground type；voltage multiplier circuit