Single DC Source Multilevel Inverter Based on Switched Capacitor with Minimum Number of Switches for Medium Power Applications [articol]

Abstract

In this paper, a single phase seven level inverter is presented with minimal number of switches using switched capacitor circuit based converter and H-bridge inverter. This configuration uses a single dc voltage source and this voltage is balanced across the capacitors to generate multilevel patterns. A basic multilevel inverter topology is developed with two capacitors and two diodes to form the basic cell which is combined further to develop the multilevel pattern. By utilizing the basic cell this paper introduces a modified multilevel inverter with a 7 and a 9 level configurations, compared to the existing capacitors this paper uses lesser number of diodes and capacitors which makes the inverter suitable for lower component count. To validate the performance of the inverter a hardware prototype has been built to evaluate the performance under different loads, the proposed inverter exhibits lower harmonic content around 2.5 % with lower component count.