Integrated multi-phase power inductor with non-coupled windings and methods of manufacture

• US 10,224,140 B2
• Filed: 02/26/2016
• Issued: 03/05/2019
• Est. Priority Date: 12/22/2015
• Status: Active Grant

• Current Assignee: Eaton Intelligent Power Limited (Eaton Corporation PLC.)
• Original Assignee: Eaton Intelligent Power Limited (Eaton Corporation PLC.)
• Inventors: Janis, John J., Yan, Yipeng
• Primary Examiner(s): Chan, Tszfung J
• Application Number:
  US15/054,727
• Publication Number:
  US 20170178784A1
• Time in Patent Office: 1,103 Days
• Field of Search: 336 65, 336 83, 336 90, 336192, 336200, 336232
• CPC Class Codes: H01F 17/06 with core substantially closed in itself, e.g. toroid
• CPC Class Codes: H01F 2017/067 Core with two or more holes to lead through conductor
• CPC Class Codes: H01F 27/24 Magnetic cores
• CPC Class Codes: H01F 27/28 Coils; Windings; Conductive connections
• CPC Class Codes: H01F 27/2847 Sheets; Strips H01F27/2866 takes precedence
• CPC Class Codes: H01F 27/292 Surface mounted devices
• CPC Class Codes: H01F 41/0233 Manufacturing of magnetic circuits made from sheets magnetic cores made from sheets H01F27/245; soft magnetic alloys in the form of sheets H01F1/16
• CPC Class Codes: H01F 41/04 for manufacturing coils coils for transformer or inductances H01F27/28

Abstract

A surface mount power inductor component for a circuit board including multi-phase power supply circuitry includes a single piece, integrally fabricated magnetic core piece formed with vertically extending interior passageways provided with vertically elongated pre-formed conductive windings that are not magnetically coupled to reduce the footprint of the inductor component while increasing its power capacity. A distributed gap material is also provided in the vertical passageways with the conductive windings that respectively connect to each phase of electrical power.

Claims

1. An inductor component assembly for power supply circuitry on a circuit board, the inductor component assembly comprising:

a single piece magnetic core that does not possess distributed gap properties, the single piece magnetic core comprising opposing first and second longitudinal side walls, opposing first and second lateral side walls interconnecting the first and second longitudinal side walls, and opposing top and bottom sides interconnecting the respective first and second longitudinal side walls and the respective first and second lateral side walls, wherein at least one interior passageway extends through and between the opposing top and bottom sides in spaced relation from each of the opposing first and second longitudinal side walls and also in spaced relation from each of the opposing first and second lateral side walls;

a first conductive winding extending in the at least one interior passageway, the first conductive winding including a planar winding section exposed on the top side and first and second planar legs each extending perpendicular to the planar winding section and opposing one another, each of the first and second planar legs protruding from the at least one interior passageway on the bottom side; and

a distributed gap magnetic material extending beneath the planar winding section and between the first and second planar legs as a column of material extending to the bottom side of the single piece magnetic core.

2. The inductor component assembly of claim 1, wherein the planar winding section of the first conductive winding has a first axial length and the first and second planar legs have a respective second axial length, the second axial length being substantially greater than the first axial length.

3. The inductor component assembly of claim 2, the first conductive winding further comprising first and second planar surface mount termination portions at respective ends of the first and second planar legs opposing the planar winding section.

4. The inductor component assembly of claim 3, wherein the first and second planar surface mount termination portions extend coplanar to one another, perpendicular to the respective first and second planar legs, and in opposing directions to one another.

5. The inductor component assembly of claim 1, wherein the at least one interior passageway comprises a first interior passageway extending between the opposing top and bottom sides and a second interior passageway extending between the opposing top and bottom sides, and the single piece magnetic core further comprises a partition wall extending between the first interior passageway and the second interior passageway.

6. The inductor component assembly of claim 5, further comprising a second conductive winding occupying the second interior passageway, the second conductive winding formed substantially identically to the first conductive winding.

7. The inductor component assembly of claim 6, wherein the second conductive winding is spaced from the first conductive winding on an opposing side of the partition wall to avoid magnetic coupling of the first and second conductive windings when the first and second conductive windings are connected to energized circuitry.

8. The inductor component assembly of claim 1, wherein at least a portion of the first and second planar legs is physically gapped from the single piece magnetic core at a location interior to the at least one interior passageway.

9. The inductor component assembly of claim 1, in combination with the circuit board, the bottom side of the single piece magnetic core located adjacent the circuit board.

10. The inductor component assembly of claim 1, wherein a height dimension of the single magnetic core piece between the top and bottom sides is substantially greater than at least one of a width dimension between the first and second longitudinal sides and a length dimension between the first and second lateral sides.

11. An inductor component assembly for power supply circuitry on a circuit board, the inductor component assembly comprising:

a single piece magnetic core comprising opposing first and second longitudinal side walls, opposing first and second lateral side walls interconnecting the first and second longitudinal side walls, and opposing top and bottom sides interconnecting the respective first and second longitudinal side walls and the respective first and second lateral side walls, wherein a first interior passageway and a second interior passageway extend between the opposing top and bottom sides and a partition wall extends between the first and second interior passageways;

a first conductive winding extending in the first interior passageway;

a second conductive winding extending in the second interior passageway;

wherein each of the first and second conductive windings are substantially identically formed and include a planar winding section exposed on the top side and first and second planar legs each extending perpendicular to the planar winding section and opposing one another, each of the first and second legs protruding from the respective first and second interior passageway on the bottom side; and

a distributed gap magnetic material extending beneath the planar winding section of each of the first and second conductive windings as a column of material extending to the bottom side of the single piece magnetic core.

12. The inductor component assembly of claim 11, wherein the single piece magnetic core is not fabricated from a distributed gap material.

13. The inductor component assembly of claim 11, wherein the planar winding section of each first and second conductive windings has a first axial length and the first and second planar legs have a respective second axial length, the second axial length being substantially greater than the first axial length.

14. The inductor component assembly of claim 11, each of the first and second conductive windings further comprising first and second planar surface mount termination portions at respective ends of the first and second planar legs opposing the planar winding section.

15. The inductor component assembly of claim 14, wherein the first and second planar surface mount termination portions extend coplanar to one another, perpendicular to the respective first and second planar legs, and in opposing directions to one another.

16. The inductor component assembly of claim 11, wherein the second conductive winding is spaced from the first conductive winding on an opposing side of the partition wall to avoid magnetic coupling of the first and second conductive windings when the first and second conductive windings are connected to energized circuitry.

17. The inductor component assembly of claim 11, wherein at least a portion of the first and second planar legs is physically gapped from the single piece magnetic core at a location interior to each of the first and second interior passageway.

18. The inductor component assembly of claim 11, in combination with the circuit board, the bottom side of the single piece magnetic core located adjacent the circuit board.

19. A method of fabricating an inductor component assembly for power supply circuitry on a circuit board, the method comprising:

providing a single piece magnetic core that does not possess distributed gap properties, the single piece magnetic core including opposing first and second longitudinal side walls, opposing first and second lateral side walls interconnecting the first and second longitudinal side walls, and opposing top and bottom walls interconnecting the respective first and second longitudinal side walls and the respective first and second lateral side walls, wherein at least one interior passageway extends through and between the opposing first and second sides in spaced relation from the first and second longitudinal walls and in spaced relation from the first and second lateral side walls, and wherein a height dimension of the single magnetic core piece between the top and bottom sides is substantially greater than at least one of width dimension between the first and second longitudinal sides and the length dimension between the first and second lateral sides;

extending a first conductive winding in the at least one interior passageway, wherein the first conductive winding includes a planar winding section exposed on the top side and first and second planar legs each extending perpendicular to the planar winding section and opposing one another, each of the first and second legs protruding from the at least one interior passageway on the bottom side; and

applying a distributed gap magnetic material beneath the planar winding section and between the first and second legs as a column of material extending to the bottom side of the single piece magnetic core.