Seven Level Inverter

Abstract

Multilevel inverters have been widely accepted for high-power high-voltage applications. Here,reverse voltage topology is used. This topology requires fewer components compared to existing inverters and requires fewer carrier signals and gate drives. Therefore, the overall cost and complexity are greatly reduced particularly for higher output voltage levels.This topology requires less number of components compared to conventional topologies. Output voltage is separated into two parts,level generation part and polarity generation part. Level generation part uses high frequency switches to generate different levels and polarity generation part is responsible for generating the polarity of the output voltage. It is also more efficient since the inverter has a component which operates the switching power devices at line frequency. Therefore, there is no need for all switches to work in high frequency which leads to simpler and more reliable control of the inverter. Finally, a prototype of the seven-level topology is built and tested to show the performance of the inverter by experimental results.