A minimized switch count single-phase AC/AC converter with active front end

A three-switch single-phase converter is introduced in this paper which is a counterpart to back-to-back half-bridge converters. Introducing the new converter and elaborating its modulation scheme, a single-phase ac/ac converter is proposed based on it. The proposed topology enjoys the benefits of an ideal single-phase ac/ac converter such as low THD input current, unity power factor, fast dynamic response and the ability to compensate input voltage sag/surge when supplying linear or nonlinear loads. The operation of the proposed system is validated through simulation.