Minimisation of circuit complexity of step-up/down three-phase AC to DC converter with sinusoidal input current and unity power factor

The authors present a three-phase step-up/down AC/DC power converter with minimised circuit complexity while achieving both sinusoidal input curent and unity power factor. Although at the cost of higher rated power and complexity of the coupling inductors, the proposed circuit requires only one active switch and provides proper transformation ratio for matching the input and output voltage levels as well as multiple outputs. Further analysis and design work is necessary in reducing the current peak and voltage stress to make this circuit more practical for high power applications