Claims
- 1. A planar magnetic element comprising:
- a substrate;
- a first magnetic layer arranged over said substrate;
- a first insulation layer arranged over said first magnetic layer;
- a planar coil formed of a conductor, having a plurality of turns, arranged over said first insulation layer;
- wherein said first magnetic layer is a quadrilateral having four triangular sections with each section having an axis of easy magnetization which extends parallel to at least one of the four sides of the quadrilateral, wherein the axis of easy magnetization of each triangular section intersects at right angles with magnetic fluxes generated by said coil, and wherein said triangular sections each have a base corresponding to each side of said quadrilateral and wherein ones of said triangular sections having immediately adjacent bases have their respective axes of easy magnetization perpendicular to each other, whereby said magnetic layer has no readily saturated magnetic regions.
- 2. A DC-DC converter, comprising:
- a switching element;
- a planar magnetic element including a substrate and a first magnetic layer arranged over the substrate with a first insulation layer arranged over the first magnetic layer with the planar coil being formed of a conductor, having a plurality of turns, arranged over said first insulation layer; and
- wherein said first magnetic layer is a quadrilateral having four triangular sections with each section having an axis of easy magnetization which extends parallel to at least one of the four sides of the quadrilateral, wherein the axis of easy magnetization of each triangular section intersects at right angles with magnetic fluxes generated by said coil, and wherein said triangular sections each have a base corresponding to each side of said quadrilateral and wherein ones of said triangular sections having immediately adjacent bases have their respective axes of easy magnetization perpendicular to each other, whereby said magnetic layer has no readily saturated magnetic regions.
- 3. A method of fabricating a planar magnetic element comprising the steps of:
- providing a first magnetic layer arranged on a substrate;
- providing a first insulation layer arranged over said first magnetic layer;
- providing a planar coil formed of a conductor, having a plurality of turns, arranged over said first insulation layer and wherein said first magnetic layer is a quadrilateral having four triangular sections with each section having an axis of easy magnetization which extends parallel to at least one of the four sides of the quadrilateral, wherein the axis of easy magnetization of each triangular section intersects at right angles with magnetic fluxes generated by said coil, and wherein said triangular sections each have a base corresponding to each side of said quadrilateral and wherein ones of said triangular sections having immediately adjacent bases have their respective axes of easy magnetization perpendicular to each other, whereby said magnetic layer has no readily saturated magnetic regions.
Priority Claims (6)
Number |
Date |
Country |
Kind |
2-139989 |
May 1990 |
JPX |
|
2-269397 |
Oct 1990 |
JPX |
|
2-269398 |
Oct 1990 |
JPX |
|
3-91614 |
Mar 1991 |
JPX |
|
3-93434 |
Mar 1991 |
JPX |
|
3-93717 |
Mar 1991 |
JPX |
|
Parent Case Info
This is a Division of application Ser. No. 08/248,679 filed on May 25, 1994, now U.S. Pat. No. 5,583,474 application Ser. No. 07/708,881 filed on May, 31, 1991, abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3319206 |
Harloff |
May 1967 |
|
4959631 |
Hasagawa et al. |
Sep 1990 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
2549670 |
May 1976 |
DEX |
Non-Patent Literature Citations (3)
Entry |
IEEE Trans. on Magnetics, vol. 26, No. 3, May 1990, pp. 1204-1209. |
Yamasawa et al, "High Frequency Operation on a Planar-Type Microtransformer and Its Application to Multilayered Switching Regulators". |
IEEE Trans. on Power Electronics, vol. 4, vol. Jan. 1989 Goldberg et al, "Issues Related to 1-10-MH.sub.2 Transformer Design". |
Divisions (1)
|
Number |
Date |
Country |
Parent |
248679 |
May 1994 |
|
Continuations (1)
|
Number |
Date |
Country |
Parent |
708881 |
May 1991 |
|