Patent ID: 8519814

Claim:
A transformer, comprising: a primary winding coupled to a first port; a secondary winding coupled to a second port, the secondary winding comprising a first segment, a second segment, a third segment, a fourth segment, and a secondary winding switch, wherein: the first segment comprises an S 1 A end and an S 1 B end, wherein the S 1 A end is coupled to the secondary winding switch and the S 1 B end is coupled to the second port; the second segment comprises an S 2 A end and an S 2 B end, wherein the S 2 A end is coupled to the secondary winding switch; the third segment comprises an S 3 A end and an S 3 B end, wherein the S 3 A end is coupled to the secondary winding switch and the S 3 B end is coupled to the S 2 B end of the second segment; and the fourth segment comprises an S 4 A end and an S 4 B end, wherein the S 4 A end is coupled to the secondary winding switch and the S 4 B end is coupled to the second port; wherein the secondary winding switch is: turned on when S 1 A is coupled to S 2 A and S 3 A is coupled to S 4 A ; and turned off when S 1 A is coupled to S 3 A and S 4 A is coupled to S 2 A ; and a tertiary winding coupled to a third port, the tertiary winding comprising four tertiary segments and a tertiary winding switch wherein the tertiary winding switch is disposed between the four tertiary segments; wherein a current is induced in the secondary winding and minimal current is induced in the tertiary winding when the secondary winding switch is turned on and the tertiary winding switch is turned off.