A New Cascaded Switched-Capacitor Multilevel Inverter Based on Improved Series–Parallel Conversion With Less Number of Components

Abstract— The aim of this paper is to present a new structure for switched-capacitor multilevel inverters (SCMLIs) which can generate a great number of voltage levels with optimum number of components for both symmetric and asymmetric values of dc-voltage sources. The proposed topology consists of a new switched-capacitor dc/dc converter (SCC) that has boost ability and can charge capacitors as self-balancing by u sing the proposed binary asymmetrical algorithm and series–parallel conversion of power supply. The proposed SCC unit is used in new configuration as a submultilevel inverter ( SMLI) and then, these proposed SMLIs are cascaded together and create a new cascaded multilevel inverter ( MLI) topology that is able to increase the number of output voltage levels remarkably without using any full H-bridge cell and also can pass the reverse current for inductive loads. In this case, two half-bridge modules besides two additional switches are employed in each o f S MLI units instead of using a full H-bridge cell that contribute to reduce the number of involved components in the current path, value of blocked voltage , the variety of isolated d c-voltage sources, and as a result, the overall cost by less number of switches in comparison with other p resented topologies. The validity of the proposed SCMLI has been carried out by several simulation and experimental r esults.< final year projects >