Reduced switch count three-phase AC-to-AC converters with input Power Factor Control

Main goal of this paper is to investigate four three-phase proposed AC-to-AC converters. Coupling of input inductors of a basic topology, allows improve the input power factor and input current waveform and the introduction of a three-level leg allows for DC-bus voltage control. This happens without any complicated switching modulation or current feedback control. The topologies can operate with either variable or fixed output frequency. The main characteristics of the proposed configurations are presented and experimental results verify the theoretical studies.