Abstract

This paper proposes a novel single-phase seven-level inverter. The topology of the proposed structure is composed of a DC source, a switched-capacitor circuit, and a coupled inductor. Compared to conventional seven-level inverter structure, numbers of switches and capacitors are reduced. The voltages of capacitors are self-balanced by using coupled inductor without complex control method. Therefore, the output voltage total harmonic distortion can be reduced. Finally, the simulation and experimental result show the 350-V input voltage, 380-V <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">ac</inf> output voltage, and 0.52% output total harmonic distortion under 3kW output power condition to verify the feasibility of the proposed multilevel inverter.

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