Solderable planar magnetic components

Patent metadata

Field	Value
Publication number	US-9633772-B2
Application number	US-201414210871-A
Country	US
Kind code	B2
Filing date	Mar 14, 2014
Priority date	Mar 14, 2013
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

An inductive component having a printed circuit board (“PCB”) with a first side and a second side. An aperture extends through the PCB and a conductive winding is printed onto the PCB surrounding the aperture. A core is formed by a first core member and a second core member. The first core member includes a first base member with at least one joining surface which is solderable to the first side. A first core leg extends at least partially through the aperture. The second core member includes at least a second base member and is coupled to the first core member or the second side. To manufacture the PCB, the first core member is soldered to the first side and then the PCB is inverted. The second core member is then coupled to at least one of the first core member or the second side.

First claim

What is claimed is:

1. An inductive component, comprising:
a printed circuit board having a first side and a second side;
an aperture defined by the printed circuit board, extending from the first side to the second side;
a conductive winding surrounding the aperture;
a core, formed by a first core member and a second core member, wherein the first core member comprises:
a first base member with a first joining surface, the first joining surface forming a first soldered connection to the first side of the printed circuit board, and
a first core leg which extends at least partially through the aperture to function as at least a partial magnetic core for the conductive winding, and
wherein the second core member comprises:
a second base member with a second joining surface, the second joining surface forming a second soldered connection to the second side of the printed circuit board;
wherein the first joining surface is formed by the first base member extending outward from the first core leg; and
wherein an air gap is formed between a first portion of the first core member and the second core member.

2. The inductive component of claim 1 , wherein the first core member includes at least one outer leg having a first distal end, and the printed circuit board includes at least one slot, and wherein the at least one outer leg extends at least partially through the at least one slot.

3. The inductive component of claim 2 , wherein the first core member includes at least two outer legs having distal ends, and the printed circuit board includes at least two slots, and wherein each of the at least two outer legs extends at least partially through the one of the at least two slots.

4. The inductive component of claim 1 , wherein the second core member includes a second core leg which extends at least partially through the aperture to function as at least a partial magnetic core for the conductive winding.

5. The inductive component of claim 4 , further comprising:
a first core leg distal end;
a second core leg distal end; and
the air gap between the first core leg distal end and the second core leg distal end.

6. The inductive component of claim 4 , further comprising:
a first outer leg extending from the first base member and terminating in a first distal end;
a second outer leg extending from the second base member and terminating in a second distal end; and
a slot extending from the first side to the second side of the printed circuit board, wherein the first outer leg and the second outer leg each extend at least partially through the slot.

7. The inductive component of claim 6 , wherein the first outer leg and the second outer leg have a combined length which is sufficient to cause an air gap between the first core member and the second core member in the aperture.

8. The inductive component of claim 1 , wherein the at least one joining surface is metalized through at least one of direct metallization of the first core member, laying metal wire in a slot on the at least one joining surface, insert molding of solderable materials on the at least one joining surface, and mechanically coupling a solderable terminal to the first core member.

9. The inductive component of claim 1 , wherein the at least one joining surface has a total surface area sized to permit a molten solder material applied to the at least one joining surface to secure the first core member to the first side of the printed circuit board when the printed circuit board is positioned with the first side facing downward.

10. The inductive component according to claim 1 , wherein the air gap is maintained independent of a thickness of the printed circuit board.

11. The inductive component of claim 5 , wherein the first core leg distal end and the second core leg distal end are each shaped with corresponding flat portions and angled portions, and wherein each angled portion is at an angle of greater than 0° and less than 90° from the flat portion.

12. The inductive component of claim 11 , wherein the angle of the angled portion to the flat portion is at an angle of greater than 45°.

13. A core member for an inductive component, comprising:
a pair of base members with at least one joining surface forming a soldered connection to a printed circuit board;
a plurality of core legs extending generally perpendicularly from each of the base members and terminating in a plurality of distal core ends, wherein the core legs are adapted to extend at least partially through at least one aperture in the printed circuit board to function as a magnetic core for windings wrapped around the aperture;
at least one outer leg extending generally perpendicularly from a first base member of the pair of base members and adapted to extend through the at least one aperture in the printed circuit board, the outer leg terminating in a distal end configured to couple to at least one of the core legs of a second base member of the pair of base members in an assembled configuration;
an inner leg disposed proximate the outer leg, the inner leg forming at least a portion of an air gap in the assembled configuration;
a first joining surface formed by the first base member extending outward from the at least one outer leg, wherein the first joining surface is configured to form a soldered connection with a first side of the printed circuit board proximate the at least one aperture; and
a second joining surface formed by the second base member, wherein the second joining surface forms a soldered connection with a second side of the printed circuit board proximate the at least one aperture.

14. The core member of claim 13 , wherein at least one of the distal core end and the distal end are shaped with an angled portion, and wherein the angled portion is at an angle of greater than 0° and less than 90° with respect to the base member.

15. The core member of claim 14 , wherein the angled portion is at an angle of greater than 45° with respect to the base member.

16. An inductive component, comprising:
a printed circuit board having a first side and a second side;
an aperture defined by the printed circuit board, extending from the first side to the second side;
a conductive winding surrounding the aperture;
a core, formed by a first core member and a second core member, wherein the first core member comprises:
a first base member forming a first joining surface, the first joining surface forming a first soldered connection to the first side of the printed circuit board, and
a first core leg extending at least partially through the aperture to function as at least a partial magnetic core for the conductive winding;
wherein the second core member comprises at least a second base member forming a second joining surface, the second joining surface forming a second soldered connection to the second side of the printed circuit board; and
wherein the first joining surface is formed by the first base member extending outward from the first core leg.

17. The inductive component of claim 16 , wherein the second core member further comprises:
a second core leg extending at least partially through the aperture to function as at least a partial magnetic core for the conductive winding.

18. The inductive component of claim 17 , wherein the second joining surface is formed by the base member extending outward from the second core leg.

Assignees

• Gentex Corp

Inventors

• Turnbull Robert R
• Levesque Andrew J
• Frye Kent H

Classifications

• H01F27/263

  Fastening parts of the core together · CPC title

• H01F27/266

  Fastening or mounting the core on casing or support (on coil H01F27/30) · CPC title

• H05K2201/086

  for inductive purposes, e.g. printed inductor with ferrite core · CPC title

• H01F2027/2819

  Planar transformers with printed windings, e.g. surrounded by two cores and to be mounted on printed circuit · CPC title

• H01F3/14

  Constrictions; Gaps, e.g. air-gaps (in magnetic shunt paths H01F3/12) · CPC title