Variable reluctance ferrite core
AssigneeInternational Business Machines Corporation
InventorDon Gilliland
Life of this patent
Estimating the term…
Abstract
A device, system, and method for suppressing electromagnetic interference (EMI). In one embodiment, an EMI suppression device includes a compound ferrite core having an inner ferrite core and an outer ferrite core. The inner core includes a through hole in which a conductor may be mounted, and the outer core includes a hole in which said inner core is mounted in a concentrically offset manner. The outer core is rotatably adjustable with respect to the inner core in a manner such that the ferrite circuit cross-section area may be varied. The magnetic reluctance of the compound core is controlled in accordance with EMI suppression requirements by adjusting the circuit cross-section area.
Claims16
An EMI suppression device comprising:
- an inner core having a hole in which a conductor may be mounted;
- and
- an outer core having a hole in which said inner core is mounted, wherein said outer core is rotatably adjustable with respect to said inner core.
A method for deploying and tuning an EMI suppression device that includes an inner core disposed within a hole of a rotatably adjustable outer core, said inner core having a hole in which a conductor may be mounted, wherein the outer core hole is axially offset with respect to the outer core such that the axial center of said inner core is not axially aligned with the axial center of said outer core, said method comprising rotating said outer core with respect to said inner core to achieve a desired level of magnetic reluctance of the EMI suppression device.
An apparatus for suppressing common-mode electromagnetic interference (EMI), said apparatus comprising:
- a cable coupled to an electronic system;
- and
- a compound ferrite core comprising:
- an inner core having a hole in which the cable is mounted;
- and
- an outer core having a hole in which said inner core is mounted, wherein said outer core is rotatably adjustable with respect to said inner core.
Dependencies are inferred from the claim text.