Simulation & Hardware Development of Single Phase Sinusoidal Pulse Width Modulation (Unipolar) Inverter

Abstract

In this paper, Simulation & Hardware development unipolar Sinusoidal Pulse Width Modulation switching strategy is presented for single phase full bridge inverter. The main advantage of this approach is that it does not required additional circuit for produced inverter?s dead time. To obtain the unipolar Sinusoidal Pulse Width Modulation switching pulses generated with carrier frequency of 1to 2 kHz & the modulation ratio change from 0.4 to 0.7 by varying amplitude of modulating signal. In the unipolar single phase SPWM microcontroller-based 300VA inverter is designed and tested for fixed M.I=0.6 with unipolar voltage switching. The waveforms of gate pulses are observed on DSO, The outputs voltage and current %THD waveforms for variable AC voltages and fixed modulation index are observed on scope, and also see the THD. The PWM inverter is the main choice in power electronic for recent years, because of its circuit simplicity and rugged control scheme Sinusoidal Pulse Width Modulation switching technique is commonly used in industrial applications.