Patent ID: 9722499
Date: 2017-08-01
CPC Classifications: H01F,H02M

Claim:
1. Energy transfer element circuitry for use in a power converter, comprising: a cancellation shield winding wound around an energy transfer element core; a first trimming capacitor coupled to a first end of the cancellation shield winding to adjust a shield response of the cancellation shield winding, wherein a second end of the cancellation shield winding is unconnected, wherein a first end of the first trimming capacitor is coupled to a first input supply rail of a power converter, and wherein a second end of the first trimming capacitor is coupled to the first end of the cancellation shield winding; a primary winding wound around the energy transfer element core; a balance shield winding wound around the energy transfer element core; a second trimming capacitor coupled to a second end of the balance shield winding to adjust a shield response of the balance shield winding, wherein a first end of the balance shield winding is unconnected, wherein a second end of the second trimming capacitor is coupled to a second input supply rail of the power converter, and wherein a first end of the second trimming capacitor is coupled to the second end of the balance shield winding; and a secondary winding wound around the energy transfer element core.