Planar magnetic element

Details Planar magnetic element Planar magnetic element

1994-05-25

1996-12-10

Kozma, Thomas J.

Inductor devices

Core forms casing

336200, 336212, 336218, 336233, H01F 2730

Patent

active

055834744

ABSTRACT:
Disclosed herein is a planar magnetic element comprising a substrate, a first magnetic layer arranged over the substrate, a first insulation layer arranged over the first magnetic layer, a planer coil formed of a conductor, having a plurality of turns, arranged over the first insulation layer and having a gap aspect ratio of at least 1, the gap aspect ratio being the ratio of the thickness of the conductor to the gap between any adjacent two of the turns, a second insulation layer arranged over the planar coil, and a second magnetic layer arranged over the second insulation layer. When used as an inductor, the planar magnetic element has a great quality coefficient Q. When used as a transformer, it has a large gain and a high voltage ratio. Since the element is small and thin, it is suitable for use in an integrated circuit, and can greatly contribute to miniaturization of electronic devices.

REFERENCES:
patent: 3319206 (1967-05-01), Harloff
patent: 3833872 (1974-09-01), Marcus et al.
patent: 4803609 (1989-02-01), Gillett et al.
patent: 4959631 (1990-09-01), Hasegawa et al.
IEEE Trans. on Magnetics, vol. 26, No. 3, May 1990, pp. 1204-1209, Yamasawa et al, "High-Frequency Operation of a Planar-Type Microtransformer and Its Application to Multilayered Switching Regulators".
IEEE Trans. on Power Electronics, vol. 4, No. 1, Jan. 1989, Goldberg et al, "Issues Related to 1-10-MHz Transformer Design".
Amorphous Planar Inductor for Small Power Supplies, the National Convention Record, the Institute of Electrical Engineers of Japan 1989, S. 18--5-3.

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