A novel single phase DC-AC inverter

Abstract

This paper presents a new topology of single phase full-bridge dc-ac inverter. In this topology, a switch is connected at the lower arm of the full-bridge switches to control the output voltage across the full-bridge inverter. The switch at the lower arm of the full-bridge controls the output of full-bridge inverter by increasing or reducing the voltage level at the lower arm of the bridge. This switch of lower arm is controlled by a high frequency SPWM switching signal. While the power switches of full-bridge inverter operate with square wave switching signal at a frequency of 50 Hz. Hence, a sinusoidal shape of output voltage is achieved from the proposed inverter. Both computer simulation and experiment were carried out to verify the performance of proposed topology. From the presented results, it is shown that new topology has nearly sinusoidal output voltage and current waveforms. Thus the output voltage of proposed topology has very less total harmonics distortion.