Surface mount magnetic components and methods of manufacturing the same

• US 8,183,967 B2
• Filed: 07/29/2009
• Issued: 05/22/2012
• Est. Priority Date: 07/11/2008
• Status: Expired due to Fees

• 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): NGUYEN, TUYEN T
• Application Number:
  US12/511,813
• Publication Number:
  US 20100007453A1
• Time in Patent Office: 1,028 Days
• Field of Search: 336/192, 336/65, 336/83, 336/200, 336/232
• US Class Current: 336/192
• CPC Class Codes: H01F 27/027 specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards
• CPC Class Codes: H01F 27/263 Fastening parts of the core together
• CPC Class Codes: H01F 27/292 Surface mounted devices
• CPC Class Codes: H01F 41/04 for manufacturing coils coils for transformer or inductances H01F27/28
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor

Abstract

Magnetic component assemblies including moldable magnetic materials including surface mount termination features, as well as manufacturing methods therefor, are disclosed that are advantageously utilized in providing surface mount magnetic components such as inductors and transformers.

Claims

1. A surface mount magnetic component assembly comprising:

a magnetic core defining at least one external side having a stepped bottom surface, wherein the stepped surface includes a non-depressed surface and at least two levels of depressed surfaces respectively spaced from the non-depressed surface by different amounts;

a conductive coil internal to the magnetic core, the coil including first and second ends;

at least one of the first and second ends extending through a portion of the stepped bottom surface; and

a terminal clip shaped to complement the stepped surface, the terminal clip abutting the stepped surface and connecting to the at least one coil end.

2. The magnetic component assembly of claim 1, wherein the terminal clip includes a through hole receiving the at least one coil end.

3. The magnetic component assembly of claim 1, wherein the terminal clip includes a terminal slot receiving the at least one coil end.

4. The magnetic component assembly of claim 1, wherein the terminal clip includes at least one post embedded in the core.

5. The magnetic component assembly of claim 1, wherein the magnetic body is molded over the terminal clip.

6. The magnetic component assembly of claim 1, wherein the terminal clip includes at least one 90°

bend.

7. The magnetic component assembly of claim 1, wherein the magnetic body comprises a side wall extending from the bottom surface, a portion of the terminal clip extending along the side wall.

8. The magnetic component assembly of claim 7, wherein the magnetic body includes a top surface opposite the stepped bottom surface, and a portion of the clip extending along the top surface.

9. The magnetic component assembly of claim 1, further comprising a circuit board, the bottom surface resting on the circuit board.

10. The magnetic component assembly of claim 1, wherein the magnetic body and coil form an inductor.

11. A surface mount magnetic component assembly comprising:

a magnetic core defining at least one external side having a stepped bottom surface;

a conductive coil internal to the magnetic core, the coil including first and second ends;

at least one of the first and second ends extending through a portion of the stepped bottom surface; and

a terminal clip shared to complement the stepped surface;

the terminal clip abutting the stepped surface and connecting to the at least one coil end;

wherein the terminal clip includes a central section and first and second depressed sections on either side of the depressed section.

12. The magnetic component assembly of claim 11, wherein one of the depressed sections includes a post embedded in the core.

13. The magnetic component assembly of claim 12, wherein the other of the depressed section is connected to the coil end.

14. A method of manufacturing a magnetic component comprising:

forming a magnetic body over at least one terminal clip and at least one coil associated with the terminal clip, whereby the terminal clip is integrally attached to a stepped bottom surface of the formed magnetic body, the stepped bottom surface having a non-depressed surface and at least two levels of depressed surfaces respectively spaced from the non-depressed surface by different amounts.

15. The method of claim 14, wherein the terminal clip includes at least one post, the method further comprising embedding the post in one of the at least two levels of depressed surfaces in the magnetic body as the magnetic body is formed.

16. The method of claim 14, wherein the terminal clip is attached to a lead frame, the method further comprising trimming the lead frame to sever the terminal clip from the lead frame.

17. The method of claim 14, further comprising bending a portion of the terminal clip around a side wall of the magnetic body.

18. The method of claim 17, further comprising bending the terminal clip to extend along a top surface of the magnetic body.

19. The method of claim 14, further comprising electrically connecting the terminal clip to the coil end.

20. The method of claim 19, wherein electrically connecting the terminal clip comprises welding or soldering the coil end to the clip.

21. The method of claim 19, wherein electrically connecting the terminal clip comprises receiving the coil end in one of a through hole or terminal slot.

22. The method of claim 19, wherein electrically connecting the terminal clip comprises attaching an exposed coil end on the bottom surface of the magnetic body to the clip.

23. The method of claim 14, wherein forming the body comprises molding the body over the at least one clip.

24. The method claim 14, wherein the at least one terminal clip includes a pair of terminal clips joined by a lead frame with a gap between the pair of clips, the magnetic body being formed in the gap between the pair of terminal clips.

25. The method of claim 14, wherein the terminal clip includes a central portion and first and second depressed portions on either side of the central portion, the method further comprising connecting the coil to one of the depressed portions.