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In this paper, a novel single-phase inverter topology is proposed, which was derived from the integration of the conventional voltage source inverter with switched-capacitor dc-dc converters. The inverter circuit can provide a low ac output voltage from a high dc input voltage, using low-voltage devices (switches and capacitors). The modulation scheme is the same employed in conventional inverters and the capacitor voltages are self-balanced. The proposed topology is suitable for applications with high conversion ratios. A 2.5 kW prototype (800 V/220 V), which achieved a peak efficiency of 97.8%, was built to show the feasibility of the novel inverter.

A Single-phase Hybrid Switched-capacitor Inverter For High Step-down Applications