Extended E matrix integrated magnetics (MIM) core

• US 7,280,026 B2
• Filed: 08/19/2004
• Issued: 10/09/2007
• Est. Priority Date: 04/18/2002
• Status: Expired due to Term

• Current Assignee: Flextronics International USA Incorporated (Flex, Ltd.)
• Original Assignee: ColdWatt, Inc. (Flex, Ltd.)
• Inventors: Chandrasekaran, Sriram, Mehrotra, Vivek
• Primary Examiner(s): Nguyen; Tuyen T.
• Application Number:
  US10/922,067
• Publication Number:
  US 20050024179A1
• Time in Patent Office: 1,146 Days
• Field of Search: 336/65, 336/83, 336/170, 336/178, 336/200, 336212-215
• US Class Current: 336/212
• CPC Class Codes: H01F 17/04 with magnetic core
• CPC Class Codes: H01F 2038/006 matrix transformer consisting of several interconnected individual transformers working as a whole
• CPC Class Codes: H01F 27/24 Magnetic cores
• CPC Class Codes: H01F 27/255 made from particles H01F27/26 takes precedence
• CPC Class Codes: H01F 3/08 made from powder powder coatings on sheets H01F3/02; on strips or ribbons H01F3/04; on wires H01F3/06
• CPC Class Codes: H01F 30/06 characterised by the structure
• CPC Class Codes: H02M 7/043 using transformers or inductors only
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor

Abstract

A matrix integrated magnetics (MIM) “Extended E” core in which a plurality of outer legs are disposed on a base and separated along a first outer edge to define windows therebetween. A center leg is disposed on the top region of the base and separated from the outer legs to define a center window. The center leg is suitably positioned along a second outer edge opposite the first or between outer legs positioned along opposing outer edges. A plate is disposed on the outer legs opposite the base.

Claims

1. A matrix integrated magnetic (MIM) core, comprising:

a base having a first outer edge;

at least three outer legs on top of said base separated along said first outer edge defining windows between said outer legs;

a center leg on said base that spans said outer legs and separated from said outer legs to define a center window; and

a plate opposite said base that covers said outer legs and windows therebetween, said center leg and said center window.

2. The MIM core of claim 1, wherein said outer legs are disposed in a rectangular window, said center leg having a rectangular shape that is coextensive with said rectangular window.

3. The MIM core of claim 2, wherein said center leg is implemented through a multiplicity of center leg elements.

4. The MIM core of claim 3, wherein said outer legs and center leg elements are either rectangular or circular.

5. The MIM core of claim 1, wherein said center leg is one piece.

6. The MIM core of claim 1, where said outer legs are disposed substantially parallel to each other and substantially perpendicular to said center leg.

7. The MIM core of claim 1, wherein a width of said center window is constant between said center leg and each of said outer legs.

8. The MIM core of claim 1, wherein said center leg is shorter than said first, second and third outer legs and forms an air gap between said center leg and said plate.

9. The MIM Core of claim 1, wherein said plate lies on said center leg, a portion of at least one of said base, said center leg and said plate being formed of a first magnetic material having a first magnetic permeability (μ

_rel1) and a first saturation flux density (B_sat1) and the remainder of the core being formed of a secondary magnetic material with a second permeability (μ

_rel2) greater than said first magnetic permeability (μ

_rel1) by at least a factor of 10.

10. The MIM core of claim 1, further comprising a plurality of primary and secondary windings for an isolated power converter wound around said outer legs.

11. The MIM core of claim 10, further comprising a winding wound around said center leg.

12. The MIM core of claim 1, further comprising a plurality of inductor windings for a non-isolated power converter wound around said outer legs.

13. The MIM core of claim 12, further comprising a winding wound around said center leg.

14. The MIM core of claim 1, wherein said base has a second outer edge separated from said first outer edge by a top region, said center leg on said top region of said base along said second outer edge.

15. The MIM core of claim 1, wherein said base has a second outer edge separated from said first outer edge by a top region, said MIM core further comprising a plurality of outer legs on top of said base separated along said second outer edge defining windows between said outer legs, said center leg on said top region of said base disposed between and parallel to said outer legs along both said first and second outer edges to define two center windows.

16. A matrix integrated magnetic (MIM) core, comprising:

a base having first and second parallel outer edges separated by a top region;

at least three outer legs on top of said base along said first outer edge of said base defining windows therebetween;

a center leg on said top region of said base disposed along said second outer edge that spans said outer legs and separated from said outer legs to define a center window; and

a plate opposite the base that covers said outer legs and windows therebetween, said center leg and said center window.

17. The MIM core of claim 16, where said outer legs are disposed parallel to each other and perpendicular to said center leg.

18. The MIM core of claim 16, wherein a width of said center window is constant between said center leg and each of said outer legs.