Patent ID: 8614615

Claim:
An energy transfer assembly for use in a resonant power converter, comprising: a first winding wound around a bobbin mounted on a magnetic core, the first winding having a first number of layers proximate to a first end along a length of the bobbin, the first winding having a second number of layers proximate to a second end along the length of the bobbin; a second winding wound around the bobbin, the second winding having a third number of layers proximate to the first end along the length of the bobbin, the second winding having a fourth number of layers proximate to the second end along the length of the bobbin, wherein at least a portion of one of the first and second windings overlaps at least a portion of an other one of the first and second windings around the bobbin, wherein a degree of overlap between the first and second windings is non-uniform between the first and second ends along the length of the bobbin such that a ratio of the first number to the third number does not equal a ratio of the second number to the fourth number; and a common mode noise cancellation circuit including: a first capacitive coupling between an input return terminal coupled to the first winding and a secondary return terminal coupled to the second winding; and a second capacitive coupling between the input return terminal coupled to the first winding and an output terminal coupled to the second winding, wherein the secondary return terminal and the output terminal are different terminals.