Patent ID: 8760896

Claim:
An apparatus, comprising: a transformer comprising three phases of primary windings, and first, second, and third secondary windings each inductively coupled to a different phase of the three phases of primary windings, wherein the first, second, and third secondary windings are not electrically tied together at a common potential node; a first converter configured to generate a voltage at a first DC bus based on a voltage across the first secondary winding; a second converter configured to generate a voltage at a second DC bus based on a voltage across the second secondary winding; a third converter configured to generate a voltage at a third DC bus based on a voltage across the third secondary winding, wherein the first, second and third converters are coupled to first, second and third input phases, respectively, of a three-phase load; and a combiner configured to generate a voltage based on the voltages at the first, second, and third DC buses.