Patent ID: 7772954

Claim:
A multi-phase transformer, comprising: a first group of windings having a plurality of primary windings and each primary winding having a first end and a second end; wherein the first end of each of the primary windings is coupled at a common junction to form a wye configuration; and wherein each of the primary winding is configured to receive a phase of a multi-phase input voltage at the second end of each of the primary windings; a second group of windings having a plurality of secondary windings and each secondary winding has a first end and a second end; wherein each secondary winding is magnetically coupled to a primary winding; and a third group of windings having a plurality of third windings and each third winding has a first end and a second end; wherein each third winding is magnetically coupled to a primary winding from among the plurality of primary windings such that an output voltage at the second end of the third windings is higher than an output voltage at the second end of the secondary windings and the second end of the primary windings.