A Cascaded Multilevel Inverter Based on Symmetric-Asymmetric DC Sources with Reduced Number of Components

What is it about?

This paper presents a new module for multilevel inverters with reduced components. Each module produces 25 levels using 4 asymmetrical DC voltage sources (two 1VDC and two 5VDC sources) and 10 semiconductor switches.

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Why is it important?

A significant advantage of the suggested module is its potentiality in producing voltage levels with negative polarity without any end side H-bridge inverter. Therefore, switches with lower voltage ratings are used in its structure. Series connection of the proposed structure leads to a modular topology which produces more voltage levels using reasonable number of switches, gate driver circuits, power diodes and less DC voltage sources. These advantages are analysed by comparing this structure with other state of the art topologies.