Dual-permeability core structure for use in high-frequency magne

Details Dual-permeability core structure for use in high-frequency magne Dual-permeability core structure for use in high-frequency magne

1990-05-07

1991-11-05

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

29607, 29608, 336 83, 336233, H01F 4102

Patent

active

050621971

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.

REFERENCES:
patent: 4007541 (1977-02-01), Monforte et al.
patent: 4138783 (1979-02-01), Portier

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