Design and Implementation of a Novel Multilevel DC-AC Inverter

A novel multilevel DC-AC inverter is proposed in this paper. A seven level AC output voltage is generated using the proposed multilevel with the befitting gate signals design. The total harmonic distortion in the sinusoidal output voltage reduced using low pass filter. With the suggested multi-level inverter the switching losses and the voltage stress of power devices can be reduced. The operating principles of the proposed inverter and the voltage balancing method of input capacitors are discussed. Finally, a laboratory model of multilevel inverter with 400 V input voltage and output 220 Vrms / 2kW is enforced.16F877A PIC microcontroller is used to control the multilevel inverter with sinusoidal pulse-width modulation (SPWM).