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

1988-12-27

1990-07-24

Kozma, Thomas J.

Inductor devices

Core forms casing

336212, 336223, 336232, 336233, H01F 2724

Patent

active

049437933

ABSTRACT:
A dual-permeability magnetic core structure is provided for use in small, high-frequency inductors and transformers. The dual-permeability corer 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 produces 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 method of combining structures of two different permeability values.

REFERENCES:
patent: 2059393 (1936-11-01), Polydoroff
patent: 2372074 (1945-03-01), Ford
patent: 2932787 (1960-04-01), Krabbe et al.
patent: 3525964 (1970-08-01), Stevenson
patent: 3668589 (1972-06-01), Wilkinson
patent: 3878495 (1975-04-01), Thomas
K. D. T. Ngo and M. H. Kuo, "Effects of Air Gaps on Winding Loss in High-Frequency Planar Magnetics", Power Electronics Specialists Conference Proceedings, Apr. 11-14, 1988, pp. 1-8.

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