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Existing multilevel inverter circuits are constructed by using more number of components and boost operation is not possible. Modified multilevel inverter with step-up operation using fewer components is proposed in this article. The proposed circuit consists of three capacitors and eight switches, which can able to produce seven-level output. Boost operation is based on the charge pump principle, which can boost 1.5 times of the input voltage in the output. Based on this idea, five-level, seven-level, and nine-level topologies are developed in simulink platform, and the outputs are presented inSection IV. A sine pulsewidth modulation (SPWM) is employed to drive switches, and switching pattern is mainly focused to balance the capacitors and to balance capacitor charging/discharging. Among the three proposed circuits, seven-level circuit is discussed inSection II, using mathematical modeling in MATLAB platform and validated in the real-time model. The main aim of this topology is to reduce total harmonic distortion.
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Suresh et al. (2022) studied this question.
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