Dual-permeability core structure for use in high-frequency magnetic components
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United States of America Patent
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Nov 5, 1991
Issued Date -
N/A
app pub date -
May 7, 1990
filing date -
Dec 27, 1988
priority date (Note) -
Expired
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Abstract
A dual-permeability magnetic core structure is provided for use in small, high-frequency inductors and transformers. The dual-permeability core encloses a winding window containing planar windings and comprises high-permeability and low-permeability sections positioned to produce a highly uniform, or uniformly varying, magnetic field on the winding surfaces. The dual-permeability core products low winding losses and a low AC-to-DC resistance ratio. Fabrication of the dual-permeability core involves a method of controlling the permeability of a magnetic material and a methd of combining structures of two different permeability values.
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