US 9,177,714 B2 · Transverse shield wire for energy transfer element

Abstract

Energy transfer elements having a shield to reduce EMI while maintaining a low profile are disclosed. In one example, the transformer may include a transverse shield wire that may be utilized to keep displacement current within the energy transfer element. While windings of the energy transfer element are generally wound axially around the axis of a bobbin in a direction generally perpendicular to the axis of the bobbin, the transverse shield wire may be placed on the bobbin extending over multiple power windings of the energy transfer element in a transverse direction. The transverse shield wire may be situated outside all other windings wound around the bobbin. In some examples, one end of the transverse shield wire may be coupled to a switching node of the energy transfer element while the other end of the transverse shield wire may be coupled to a winding of the energy transfer element.

Claims20

Dependent claims

An energy transfer element comprising:

a bobbin;
a primary winding wound around an axis of the bobbin between a first end of the bobbin and a second end of the bobbin;
a secondary winding wound around the axis of the bobbin between the first end of the bobbin and the second end of the bobbin;
and
a transverse shield wire having a first end and a second end, wherein the first end of the transverse shield wire is coupled to a first terminal mounted to the bobbin, wherein the second end of the transverse shield wire is coupled to a second terminal mounted to the bobbin, wherein the first end of the transverse shield wire is coupled to the first end of the bobbin, wherein the transverse shield wire extends between the first and second terminals and in a direction transverse to the primary winding and the secondary winding, wherein the transverse shield wire encloses an area that extends between the first and second ends of the bobbin a distance that is less than a distance between the first end of the bobbin and the second end of the bobbin along the axis of the bobbin.

2 more elements

A power converter comprising:

a power switch;
a controller for controlling the power switch;
and
an energy transfer element comprising:
a bobbin;
a primary winding wound around an axis of the bobbin between a first end of the bobbin and a second end of the bobbin;
a secondary winding wound around the axis of the bobbin between the first end of the bobbin and the second end of the bobbin;
and
a shield wire having a first end and a second end, wherein the first end of the shield wire is coupled to a first terminal mounted to the bobbin, wherein the second end of the shield wire is coupled to a second terminal mounted to the bobbin, wherein the first end of the shield wire is coupled to the first end of the bobbin between the primary winding and the power switch, wherein the shield wire extends between the first and second terminals and in a direction transverse to the primary winding and the secondary winding, wherein the shield wire encloses an area that extends between the first and second ends of the bobbin a distance that is less than a distance between the first end of the bobbin and the second end of the bobbin along the axis of the bobbin.

6 more elements

Dependencies are inferred from the claim text.

Transverse shield wire for energy transfer element

Life of this patent

Transverse shield wire for energy transfer element

Life of this patent

Abstract

Claims20