Patent ID: 8665048

Claim:
An inductor assembly suitable for use in a power conversion circuit, comprising: a magnetic core; a ribbon of conductor wound around the core to form a coil, wherein successive turns of the coil are insulated from each other; a plurality of electrostatic screens, each screen positioned between different turns of the coil and electrically insulated from the coil, wherein each screen functions to reduce capacitive coupling between successive turns of the coil, and wherein the electrostatic screens are each independently connected to electrical ground; and an external electrostatic screening surrounding the coil, the external electrostatic screening being connected to ground, wherein the external electrostatic screening includes a conductive bobbin around which the ribbon of conductor is wound, wherein the bobbin is electrically insulated from the ribbon of conductor, and wherein the bobbin is constructed not to provide a conductive path around the complete circumference of the core, and wherein the bobbin comprises a central tube formed from conductive material around which the conductive ribbon is wound, the tube being constructed not to provide a conductive path around the complete circumference of the core, and cheek plates positioned at each end of the central tube, wherein the cheek plates have at least one surface partially or fully covered in an electrically conductive material constructed not to provide a conductive path around the complete circumference of the core.