Filter inductor for heavy-current application

• US 10,643,784 B2
• Filed: 04/19/2017
• Issued: 05/05/2020
• Est. Priority Date: 04/20/2016
• Status: Active Grant

• Current Assignee: Bel Fuse Limited (Bel Fuse)
• Original Assignee: Bel Fuse Limited (Bel Fuse)
• Inventors: Yao, Jianbin, Huang, Hai
• Primary Examiner(s): Talpalatski, Alexander
• Assistant Examiner(s): Baisa, Joselito
• Application Number:
  US15/491,055
• Publication Number:
  US 20170309390A1
• Time in Patent Office: 1,112 Days
• Field of Search: 336192
• CPC Class Codes: H01F 17/04 with magnetic core
• CPC Class Codes: H01F 17/043 with two, usually identical or nearly identical parts enclosing completely the coil (pot cores)
• CPC Class Codes: H01F 2027/297 with pin-like terminal to be inserted in hole of printed path
• CPC Class Codes: H01F 27/24 Magnetic cores
• CPC Class Codes: H01F 27/2852 Construction of conductive connections, of leads
• CPC Class Codes: H01F 27/292 Surface mounted devices
• CPC Class Codes: H01F 27/306 Fastening or mounting coils or windings on core, casing or other support
• CPC Class Codes: H01F 41/0206 Manufacturing of magnetic cores by mechanical means magnetic cores per se H01F27/24
• CPC Class Codes: H01F 41/10 Connecting leads to windings making electric connections in general H01R43/00
• CPC Class Codes: H05K 1/0263 High current adaptations, e.g. printed high current conductors or using auxiliary non-printed means; Fine and coarse circuit patterns on one circuit board H05K1/0293 takes precedence
• CPC Class Codes: H05K 1/184 Components including terminals inserted in holes through the printed circuit board and connected to printed contacts on the walls of the holes or at the edges thereof or protruding over or into the holes
• CPC Class Codes: H05K 2201/086 for inductive purposes, e.g. printed inductor with ferrite core
• CPC Class Codes: H05K 2201/1003 Non-printed inductor

Abstract

A filter inductor for high-current applications. The filter inductor includes a magnetic core and a winding. The winding includes a shaped section having opposing ends, a pair of arm sections laterally extending from the opposing ends of the shaped section, respectively, and a pair of inductor pins, each extending perpendicular from an end of a respective arm section. The magnetic core includes a first core portion and a second core portion. The first core portion includes a recessed channel configured to receive the shaped section of the winding. The second core portion includes a pair of recessed regions configured to receive the pair of arm sections of the winding, respectively. The first core portion and the second core portion are coupled in contact to one another to secure the shaped section of the winding within the magnetic core. The filter inductor can be edge-mounted to a printed circuit board.

Claims

1. A passive magnetic component, comprising:

a magnetic core; and

a winding,

wherein the winding includes (1) a C-shaped section having a first end and a second end, (2) first and second arm sections, the first arm section extending laterally from the first end of the C-shaped section and the second arm section extending laterally from the second end of the C-shaped section, and (3) first and second inductor pins, the first inductor pin extending substantially perpendicular from an end of the first arm section and the second inductor pin extending substantially perpendicular from an end of the second arm section.

2. The passive magnetic component of claim 1 wherein the winding further includes at least one connector pin extending substantially perpendicular from the end of one of the arm sections in a direction opposite the respective inductor pin.

3. The passive magnetic component of claim 1 wherein the magnetic core includes a first core portion having a recessed channel configured to receive at least the C-shaped section of the winding.

4. The passive magnetic component of claim 3 wherein the magnetic core further includes a second core portion having a pair of recessed regions configured to receive the first and second arm sections, respectively.

5. The passive magnetic component of claim 4 wherein the first core portion and the second core portion are coupled in contact to one another to secure at least the C-shaped section of the winding within the magnetic core.

6. The passive magnetic component of claim 1 wherein the first and second arm sections have substantially the same length.

7. The passive magnetic component of claim 1 wherein the winding including the C-shaped section, the first and second arm sections, and the first and second inductor pins are formed from a sheet of metal.

8. The passive magnetic component of claim 7 wherein the sheet of metal is a sheet of copper material.

9. The passive magnetic component of claim 1 wherein at least one of the connector pins has at least one stop for limiting an insertion of the at least one connector pin through a hole in a printed circuit board.

10. A method of fabricating a passive magnetic component, comprising:

forming a winding as an integrated structure, the winding including (1) a C-shaped section having a first end and a second end, (2) first and second arm sections, the first arm section extending laterally from the first end of the C-shaped section and the second arm section extending laterally from the second end of the C-shaped section, and (3) first and second inductor pins, the first inductor pin extending substantially perpendicular from an end of the first arm section and the second inductor pin extending substantially perpendicular from an end of the second arm section;

providing a magnetic core assembly including a first core portion and a second core portion;

forming a recessed channel in the first core portion to conform to a C-shape of the C-shaped section of the winding;

receiving the C-shaped section of the winding in the recessed channel of the first core portion; and

coupling the first core portion and the second core portion in contact to one another to secure at least the C-shaped section of the winding within the magnetic core assembly.

11. The method of claim 10 further comprising:

forming a pair of recessed regions in the second core portion to conform to cross-sections of the first and second arm sections of the winding, respectively.

12. The method of claim 11 further comprising:

receiving the first and second arm sections in the pair of recessed regions of the second core portion, respectively.

13. The method of claim 10 wherein the forming of the winding as the integrated structure includes forming the winding from a sheet of metal.

14. A printed circuit board assembly, comprising:

a printed circuit board having an edge; and

a passive magnetic component configured to be mounted along the edge of the printed circuit board, wherein the passive magnetic component incudes;

a magnetic core; and

a winding,

wherein the winding includes (1) a C-shaped section having a first end and a second end, (2) first and second arm sections, the first arm section extending laterally from the first end of the C-shaped section and the second arm section extending laterally from the second end of the C-shaped section, and (3) first and second inductor pins, the first inductor pin extending substantially perpendicular from an end of the first arm section and the second inductor pin extending substantially perpendicular from an end of the second arm section.

15. The printed circuit board assembly of claim 14 wherein the winding further includes at least one connector pin extending substantially perpendicular from the end of one of the arm sections in a direction opposite the respective inductor pin.

16. The printed circuit board assembly of claim 14 wherein the printed circuit board includes a plurality of holes formed therethrough, and wherein the first and second inductor pins of the winding are inserted through the plurality of holes in the printed circuit board, respectively.

17. The printed circuit board assembly of claim 16 wherein the magnetic core includes a first core portion having a recessed channel configured to receive at least the C-shaped section of the winding, and a second core portion having a pair of recessed regions configured to receive the first and second arm sections of the winding, respectively.

18. The printed circuit board assembly of claim 17 wherein the first core portion and the second core portion are coupled in contact to one another to secure at least the C-shaped section of the winding within the magnetic core, and wherein a surface of the second core portion is positioned against the edge of the printed circuit board so as to align the first and second inductor pins of the winding with the plurality of holes in the printed circuit board, respectively.