Magnetic components and methods of manufacturing the same

• US 8,659,379 B2
• Filed: 08/31/2009
• Issued: 02/25/2014
• Est. Priority Date: 07/11/2008
• Status: Active Grant

• Current Assignee: Eaton Intelligent Power Limited (Eaton Corporation PLC.)
• Original Assignee: Cooper Technologies Company (Eaton Corporation PLC.)
• Inventors: Yan, Yipeng, Bogert, Robert James
• Primary Examiner(s): Talpalatski, Alexander
• Assistant Examiner(s): LIAN, MANG TIN BIK
• Application Number:
  US12/551,028
• Publication Number:
  US 20100039200A1
• Time in Patent Office: 1,639 Days
• Field of Search: 336220-222, 336/188, 336/189, 336/214, 336/232, 336/233, 336/234, 336/83, 336/192, 336/170
• US Class Current: 336/83
• CPC Class Codes: H01F 17/04 with magnetic core
• CPC Class Codes: H01F 2017/048 with encapsulating core, e.g. made of resin and magnetic powder
• 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 3/10 Composite arrangements of magnetic circuits

Abstract

Magnetic component assemblies including coil coupling arrangements, that are advantageously utilized in providing surface mount magnetic components such as inductors and transformers.

Claims

1. A magnetic component assembly comprising:

an integral, single piece magnetic body; and

at least four distinct, mutually coupled coils situated in the integral, single piece magnetic body,

wherein each of the at least four distinct, mutually coupled coils includes a conductive path defining less than one turn of a winding, and

wherein the at least four distinct, mutually coupled coils are arranged in the integral, single piece magnetic body in a flux sharing relationship with one another,

wherein each of the at least four distinct, mutually coupled coils respectively includes first and second ends,

wherein the integral, single piece magnetic body defines first, second, third and fourth orthogonal sides,

wherein the first side of the integral, single piece magnetic body includes both the first and second ends of a first one of the at least four distinct, mutually coupled coils,

wherein the second side of the integral, single piece magnetic body includes both the first and second ends of a second one of the at least four distinct, mutually coupled coils,

wherein the third side of the integral, single piece magnetic body includes both the first and second ends of a third one of the at least four distinct, mutually coupled coils, and

wherein the fourth side of the integral, single piece magnetic body includes both the first and second ends of a fourth one of the at least four distinct, mutually coupled coils, and

wherein the component defines a coupled power inductor.

2. The magnetic component assembly of claim 1, wherein each respective one of the at least four distinct, mutually coupled coils defines a central flux area through which a magnetic flux generated by the respective one of the coils may pass, and wherein a portion of the flux generated by each respective one of the coils returns only in the central flux area of the respective one of the coils without passing through the central flux area of an adjacent one of the at least four distinct, mutually coupled coils.

3. The magnetic component assembly of claim 2, wherein each of the at least four distinct, mutually coupled coils respectively extends in a plane, and wherein the planes of the at least four distinct, mutually coupled coils are spaced apart from one another in a direction perpendicular to the planes.

4. The magnetic component assembly of claim 3, wherein the central flux area of each of the at least four distinct, mutually coupled coils and the spacing from an adjacent one of the at least four distinct, mutually coupled coils in the direction perpendicular to the planes defines a cross sectional area of the magnetic body through which the generated flux passes.

5. The magnetic component assembly of claim 4, wherein an overlapping central flux area between adjacent ones of the at least four distinct, mutually coupled coils is unequal.

6. The magnetic component assembly of claim 1, wherein a respective winding of each of the at least four distinct, mutually coupled coils extends in a respective one of a plurality of parallel planes, and at adjacent ones of the at least four distinct, mutually coupled coils are spaced apart from one another in a direction normal to the plurality of parallel planes such that the central flux areas of first and second ones of the at least four distinct, mutually coupled coils are separated from one another by a first distance.

7. The magnetic component assembly of claim 6, wherein a third one of the at least four distinct, mutually coupled coils is spaced apart from the second coil in a direction normal to the plurality of parallel planes of the coils, such that the central flux areas of the second and third coils are separated from one another by a second distance different from the first distance, and wherein the second coil is located between the first and third coils.

8. The magnetic component assembly of claim 1, wherein the integral, single piece magnetic body comprises magnetic metal powder particles surrounded by a non-magnetic material, wherein adjacent metal powder particles are separated from one another by the non-magnetic material.

9. The magnetic component assembly of claim 1, wherein the at least four distinct, mutually coupled coils are configured to carry different phases of electrical power.

10. The magnetic component assembly of claim 1, wherein each of the at least four distinct, mutually coupled coils comprises first and second ends protruding from the integral, single piece magnetic body.

11. The magnetic component assembly of claim 1, wherein the winding in each of the at least four distinct, mutually coupled coils is substantially C-shaped.

12. The magnetic component assembly of claim 1, further comprising a circuit board, the circuit board configured with a layout defining a plurality of conductive paths defining a winding corresponding to respective ones of the mutually coupled coils, each of the mutually coupled coils in the component being connected to one of the plurality of conductive paths of the circuit board.

13. The magnetic component assembly of claim 12, wherein the conductive path of the circuit board defines less than one turn of a winding.

14. The magnetic component assembly of claim 1, wherein

each of the at least four distinct, mutually coupled coils extends in a respective one of spaced apart but parallel planes, and adjacent ones of the at least four distinct, mutually coupled coils do not completely overlap one another in a direction substantially perpendicular parallel planes.

15. The magnetic component assembly of claim 1, wherein the at least four distinct, mutually coupled coils are formed on a substrate material and include a plurality of partial turns defining a central flux area through which a magnetic flux generated by the coil may pass, the central flux areas of at least two of the coils overlapping one another in the integral, single piece magnetic body such that a portion of the flux generated by one of the coils passes through the central flux area of at least one other of the plurality of coils.

16. The magnetic component assembly of claim 1, wherein the assembly is configured for surface mounting to a circuit board.

17. The magnetic component assembly of claim 16, wherein the assembly is configured as a low profile, surface mount device.

18. A magnetic component assembly comprising:

a one piece magnetic body having distributed gap properties and having at least three sides; and

at least three distinct, mutually coupled coils embedded in the one piece magnetic body, each of the three distinct, mutually coupled coils including a first end and a second end, and a winding between the first and second ends;

wherein each of winding of the at least three distinct, mutually coupled coils includes a conductive path defining less than one complete turn;

wherein the mutually coupled coils are arranged in the one piece magnetic body in a flux sharing relationship with one another;

wherein a first one of the at least three sides includes first and second ends of a first one of the plurality of distinct, mutually coupled coils,

wherein a second one of the at least three sides includes first and second ends of a second one of the plurality of distinct, mutually coupled coils,

wherein a third one of the at least three sides includes first and second ends of a third one of the plurality of distinct, mutually coupled coils, and

wherein energy is stored in the one piece magnetic body as electrical current flows through at least one of the plurality of distinct, mutually coupled coils, thereby defining a coupled power inductor.

19. The magnetic component assembly of claim 18,

wherein plurality of distinct, mutually coupled coils comprises at least four distinct, mutually coupled coils,

wherein the one piece magnetic body has at least four sides, and

wherein each of the four sides of the one piece magnetic body includes at least one end of each of the at least four distinct, mutually coupled coils.

20. The magnetic component assembly of claim 18, wherein the assembly is configured for surface mounting to a circuit board.

21. The magnetic component assembly of claim 20, wherein the assembly is configured as a low profile, surface mount device.

22. A power inductor comprising:

a single magnetic body piece having distributed gap properties and having a first side and a second side orthogonal to the first side, and a third side extending orthogonally to one of the first and second sides; and

a plurality of distinct, mutually coupled coils embedded in the single magnetic body piece;

wherein each of the plurality of distinct, mutually coupled coils includes a conductive path defining less than one turn of a winding and first and second ends;

wherein the mutually coupled coils are arranged in the single magnetic body piece in a flux sharing relationship with one another;

wherein the first side of the single magnetic body piece includes first and second ends of a first one of the plurality of distinct, mutually coupled coils,

wherein the second side of the single magnetic body piece includes first and second ends of a second one of the plurality of distinct, mutually coupled coils,

wherein the third side of the single magnetic body piece includes at least one of first and second ends of a third one of the plurality of distinct, mutually coupled coils, and

wherein energy is stored in the one piece magnetic body as electrical current flows through at least one of the plurality of distinct, mutually coupled coils and wherein energy is returned to an electrical circuit established through at least one of the plurality of distinct, mutually coupled coils.

23. The power inductor of claim 22,

wherein the single magnetic body piece further comprises a fourth side extending orthogonally to the third side, and

wherein the fourth side of the single magnetic body piece includes at least one of first and second ends of a fourth one of the plurality of distinct, mutually coupled coils.

24. The power inductor of claim 22, wherein the power inductor is configured for surface mounting to a circuit board.

25. The power inductor of claim 24, wherein the power inductor is configured as a low profile, surface mount device.