Autotransformer Incorporated Single-Phase AC–AC Converter

Abstract

This article presents an ac–ac direct single-phase converter by using an auto transformer approach and impedance network. It has buck–boost operation in a single-stage direct ac–ac conversion. The high voltage gain is enabled through magnetic coupling and turn ratios of coupled transformer. Notably, it employs a coupled transformer with high voltage gain while maintaining a 1:1 unity turn ratio. The proposed converter is designed to either maintain the phase angle or reverse it, while both input and output sides shares a common ground for stability. The current and voltage spikes across power electronics components are curtailed by safe commutation strategy than snubber circuit. The input inductor is in series with source to make current sinusoidal and continuous. The significance of this work is shown by comparison among the same type of topologies under the same conditions. The theoretical, simulation, and experimental analysis illustrate the robustness of the proposed converter.