A three-leg full-bridge inverter is conventionally used to generate a split-phase AC voltage. However, significant parasitic ground currents arise when the neutral phase of such an inverter is grounded. The main reason behind the ground currents is the presence of high-frequency voltage between the neutral point and the negative terminal of the DC-bus. A novel inverter topology with split DC-bus capacitor is introduced in this paper to generate a transformer-less neutral grounded split-phase AC voltage supply. The addition of the capacitive filter significantly attenuates the high-frequency ac voltage component between the neutral phase and the DC-bus negative terminal and thus allows the inverter to generate a transformer-less neutral grounded split-phase AC voltage. The experimental results of a 12kW lab prototype are presented for verifying the proposed converter circuit topology.
