公开(公告)号：WO2022146457A1

公开(公告)日：2022-07-07

申请号：PCT/US2021/014091

申请日：2021-01-20

Applicant: POWER INTEGRATIONS, INC.

Inventor： MATTHEWS, David Michael Hugh ,  POLIVKA, William M.

IPC: H01F3/00 ,  H01F3/14 ,  H02K1/00 ,  H02K1/02

Abstract: An energy transfer element comprises a magnetic core having a gap in a magnetic path. Magnetizable material producing an initial flux density is positioned in the gap. One or more power windings is wrapped around the magnetic path. When the magnetizable material is magnetized the flux density produced by the magnetized material is offset from the initial flux density. The core is a toroid magnetic core or is comprised of two core pieces. The magnetizable material is an unmagnetized magnet or a mixture of a suspension medium comprising uncured epoxy and magnetizable particles. The magnetizable particles are selected from a group comprising Neodymium Iron Boron (NdFeB) based materials or Samarium Cobalt (SmCo) based material.

公开(公告)号：WO2022146458A1

公开(公告)日：2022-07-07

申请号：PCT/US2021/014095

申请日：2021-01-20

Applicant: POWER INTEGRATIONS, INC.

Inventor： MATTHEWS, David Michael Hugh ,  POLIVKA, William M.

IPC: H02K1/02 ,  H01F3/00 ,  H01F3/14 ,  H02K1/00

Abstract: A method for making an energy transfer element provides a magnetic core having a gap in a magnetic path, positions in the gap magnetizable material that produces an initial flux density, cures the suspension medium, and wraps one or more power windings around the magnetic path. When the magnetizable material is magnetized, a flux density produced by the magnetized material is offset from the initial flux density. The magnetizable material comprises a mixture of a suspension medium that includes uncured epoxy and magnetizable particles. The magnetizable particles are capable of permanent magnetic properties when magnetized. The particles of magnetic material having magnetic permeability of at least 1000µo. The particles of magnetic material that have a magnetic permeability of at least 1000µo and the particles of magnetizable particles are uniformly distributed in the suspension medium.