A Novel Structure of Switched Capacitor Multilevel Inverter with Reduced Device Count

Abstract

A novel switched capacitor multilevel inverter structure (SCMLI) is presented in this paper. The proposed topology has the capability to generate a boosted multilevel output voltage using less number of components such as isolated dc power sources, switches, drivers, capacitors and power diodes. The proposed SCMLI can produce 13 output voltage levels and 21 output voltage levels by using symmetric and asymmetric dc source configuration respectively and 14 switches, 3 diodes and 3 capacitors. To enhance the output voltage levels, cascaded MLI structure using proposed basic SCMLI structure has been introduced. Further, the analysis has been carried out for cascaded SCMLI for the symmetric as well as asymmetric dc source configurations. In comparison with other topologies, the presented topology provides more output voltage levels using reduced components. In the comparison study, different aspects of the number of switches, dc power supplies, capacitors, diodes for producing specific output voltage levels are accounted. Further, the switching stress and Total Standing Voltage of the inverter has been determined and compared with that of other topologies. The extensive simulation studies of the symmetric and asymmetric structure of proposed SCMLI have been done in MATLAB/SIMULINK under different condition. The simulation results proof the merits of the proposed topology.