Patent ID: 9589718
Date: 2017-03-07
CPC Classifications: H01F,Y10T

Claim:
1. A method for reducing or eliminating conducted common mode noise in a transformer having primary and secondary windings, said method comprising steps of: interposing a shield member between said primary and secondary windings of said transformer to form a parasitic capacitance between said shield member and said secondary winding or a further shield member; developing a voltage distribution in said secondary winding or said further shield member interposed between said shield member and said secondary winding; and connecting said shield member to said primary winding such that a voltage distribution is developed in said shield member wherein said voltage distribution developed in said shield member and said voltage distribution developed in said secondary winding or said further shield member are substantially equal or cause substantially complementary currents in said parasitic capacitance between said shield member and said secondary winding or said further shield member such that net common mode current in said parasitic capacitance is substantially eliminated.