Simple control techniques for multilevel inverter

This paper presents new simple control techniques for single-phase five-level Pulse Width Modulation (PWM) inverter. The proposed control technique requires only driving two high frequency switches with maintain other switches at line frequency. Operational principles with switching functions are analyzed for the two techniques. A comparison between the two proposed techniques has been done based on the resulted features. Simulation and experimental results have been done to demonstrate the validity of the proposed control techniques. Switching signals are generated experimentally using FPGA XC3S400.