Design and Implementation of Inverter Single Phase Nine-Level Using PIC18F4550

Multilevel inverters have been widely accepted for high-power, high-voltage applications. This paper proposes a multilevel inverter (MLI) topology with the combination of four buck DC-DC converters and H-Bridge inverter to produce a nine-level inverter. The four buck DC-DC converter operates with high frequency for generating voltage levels and H-bridge inverter with low frequency (50 Hz) operates for reversing the polarity of the output. The controlling technique was done digitally using PIC18F4550 to simplify control strategy. Finally, a prototype of the nine-level proposed topology is built and tested to show the performance of the inverter by experimental results.