A Modified Multi Level Inverter With Inverted SPWM Control

Abstract

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 in Section 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 in Section 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.