Patent ID: 7772953

Claim:
A multi-phase transformer, comprising: a first group of windings having a plurality of primary windings; wherein each primary winding includes one or more sub primary windings coupled in series, and a junction of two sub primary windings defines an interior junction; wherein each end of the primary windings is coupled to an end of another primary winding to form a delta configuration and a junction of two primary windings defines an exterior junction; and wherein each of the primary windings is configured to receive a phase of a multi-phase input voltage at the exterior junction; a second group of windings having a plurality of secondary windings and each secondary winding has a first end and a second end; wherein the first end of each secondary winding is coupled to one of the primary windings; wherein each secondary winding is magnetically coupled to a primary winding from among the plurality of plurality of primary winding; and a third group of windings having a plurality of third windings; wherein each third winding includes a first end and a second end, and the first end of each of the third winding is coupled to a secondary winding from among the plurality of secondary windings or to a primary winding from among the plurality of primary windings; wherein each third winding is magnetically coupled to a primary winding from among the plurality of primary windings; wherein the third group of windings is configured 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 exterior junction of the primary windings.