Ultra-narrow high current power inductor for circuit board applications

Patent metadata

Field	Value
Publication number	US-11476040-B2
Application number	US-201916665173-A
Country	US
Kind code	B2
Filing date	Oct 28, 2019
Priority date	Oct 28, 2019
Publication date	Oct 18, 2022
Grant date	Oct 18, 2022

Abstract

An electromagnetic component such as a power inductor includes first and second magnetic core pieces and a preformed coil winding therebetween. The preformed coil winding includes a top winding section and a pair of coplanar winding legs defining a U-shaped winding section therewith. The pair of winding legs are oriented perpendicular to a circuit board in use. First and second surface mount terminals respectively extend perpendicular to the pair of winding legs in opposing directions to each other, such that each of them extends only on one of the first and second magnetic core pieces but not the other.

First claim

What is claimed is:

1. An electromagnetic component assembly for a circuit board, the component assembly comprising:
a magnetic core assembled from a first magnetic core piece and a second magnetic core piece, wherein each of the first magnetic core piece and the second magnetic core piece each include a top side and a bottom side, wherein the top side is elevated from the circuit board and the bottom side is proximate the circuit board in use, and wherein the first magnetic core piece and the second magnetic core piece are arranged side-by-side; and
a first preformed conductive coil winding received by at least one of the first magnetic core piece and the second magnetic core piece, wherein the first preformed conductive coil winding includes:
a top winding section extending to the top side of at least one of the first magnetic core piece and the second magnetic core piece;
a pair of winding legs extending from opposing ends of the top winding section and defining a U-shaped winding section therewith, wherein the pair of winding legs extend coplanar to one another and are oriented perpendicular to the circuit board in use, the pair of winding legs further being located in between the first magnetic core piece and the second magnetic core piece; and
first and second surface mount terminals respectively extending perpendicular from the pair of winding legs opposite the top winding section, wherein the first surface mount terminal extends in a first direction and solely on the bottom side of the first magnetic core piece, and wherein the second surface mount terminal extends in a second direction solely on the bottom side of the second magnetic core piece.

2. The electromagnetic component assembly of claim 1 , wherein the top winding section is a planar element extending in a coplanar relationship to the pair of winding legs.

3. The electromagnetic component assembly of claim 1 , wherein the top winding section is centered between the first magnetic core piece and the second magnetic core piece.

4. The electromagnetic component assembly of claim 1 , wherein the first and second surface mount terminals each extend to two side edges on the bottom side of the respective first and second magnetic core piece.

5. The electromagnetic component assembly of claim 1 , wherein at least one of the first and second magnetic core piece is formed with a pair of vertical slots to respectively receive the pair of winding legs.

6. The electromagnetic component assembly of claim 5 , wherein both of the first and second magnetic core piece are formed with a pair of vertical slots to respectively receive the pair of winding legs.

7. The electromagnetic component assembly of claim 6 , wherein at least one of the first and second magnetic core piece is formed with an upper recess to receive the top winding section.

8. The electromagnetic component assembly of claim 7 , wherein both of the first and second magnetic core pieces are formed with an upper recess to receive the top winding section.

9. The electromagnetic component assembly of claim 1 , wherein each of the first and second magnetic core piece is formed with only one lower recess to receive a respective one of the first and second surface mount terminals.

10. The electromagnetic component assembly of claim 1 , wherein the first surface mount terminal extends axially on the bottom side of the first magnetic core piece for a greater distance than the second surface mount terminal extends on the bottom side of the second magnetic core piece.

11. The electromagnetic component assembly of claim 1 , wherein the magnetic core has a length dimension, a width dimension, and a height dimension, wherein the length and height dimensions are substantially greater than the width dimension.

12. The electromagnetic component assembly of claim 11 , wherein the first and second surface mount terminals extend parallel to the width dimension.

13. The electromagnetic component assembly of claim 11 , wherein a plane of the pair of winding legs is oriented to extend parallel to the length dimension of the magnetic core.

14. The electromagnetic component assembly of claim 11 , wherein the first and second magnetic core pieces have a different width from one another.

15. The electromagnetic component assembly of claim 1 , wherein the top winding section extends perpendicularly to the plane of the pair of winding legs.

16. The electromagnetic component assembly of claim 15 , wherein the top winding section overlies one of the first and second magnetic core pieces but not the other.

17. The electromagnetic component assembly of claim 1 , further comprising a second preformed conductive coil winding and a third magnetic core piece separating the first preformed conductive coil winding from the second preformed conductive coil winding.

18. The electromagnetic component assembly of claim 17 , wherein the third magnetic core piece includes vertical slots to receive the pair of winding legs of at least one of the first and second preformed conductive coil winding.

19. The electromagnetic component assembly of claim 17 , wherein the assembly is scalable to include n numbers of additional preformed coils and n numbers of additional core pieces.

20. The electromagnetic component assembly of claim 1 , wherein the component is a power inductor.

Assignees

• Eaton Intelligent Power Ltd

Inventors

• Yan Yipeng
• Wang Yazhou
• Zhou Dengyan

Classifications

• H01F27/292 Primary

  Surface mounted devices · CPC title

• H01F17/043

  with two, usually identical or nearly identical parts enclosing completely the coil (pot cores) · CPC title

• Y10T29/49069

  Data storage inductor or core · CPC title

• H01F17/04 Primary

  with magnetic core · CPC title

• H01F27/306

  Fastening or mounting coils or windings on core, casing or other support · CPC title