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This paper presents a new Switched-Capacitor Multilevel Inverter (SCMLI) structure. The presented configuration generates a staircase almost sinusoidal AC voltage by using a single DC source and a few capacitors which its amplitude is several times the input voltage. The operation of the converter is controlled by the help of NLC modulation strategy to choose the best switching states in a way that they always ensure the self-balancing capability of the capacitors voltages. Low switching frequency, simple control and inherent bipolar output are some of the advantages of the presented SCMLI. In comparison with other existing topologies, to reach a specific voltage level, the structure requires less circuit elements since the capacitors in follower modules can be charged up to 3 times the input voltage. Having a modular structure, facilitates the expansion of the circuit to attain higher voltage levels. In order to investigate the performance of the presented topology, MATLAB software was used. Furthermore, a 13-level laboratory prototype was performed to affirm the efficacy of the circuit under different loads using AVR ATMEGA 16A microcontroller. Both simulation and experimental results accredit the appropriate performance of the converter. Finally, after calculating losses, a theoretical efficiency of 92.72% is reached.

Keywords: Switched-Capacitor Inverter, Modular Converter, NLC Modulation, Self-balancing Voltage, voltage multiplier

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