Post-mountable planar magnetic device and method of manufacture thereof

• US 6,239,683 B1
• Filed: 09/30/1997
• Issued: 05/29/2001
• Est. Priority Date: 05/04/1995
• Status: Expired due to Term

• Current Assignee: Lineage Power Corporation (GE Aerospace)
• Original Assignee: Tyco Electronics Logistics AG (TE Connectivity Limited)
• Inventors: Roessler, Robert Joseph, Pitzele, Lennart Daniel
• Primary Examiner(s): MAI, ANH T
• Application Number:
  US08/940,672
• Time in Patent Office: 1,337 Days
• Field of Search: 336/200, 336/232, 336/65, 336/83, 361/774
• US Class Current: 336/200
• CPC Class Codes: H01F 2027/2819 Planar transformers with printed windings, e.g. surrounded by two cores and to be mounted on printed circuit
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01F 27/29 Terminals; Tapping arrangements for signal inductances
• CPC Class Codes: H01F 41/046 structurally combined with ferromagnetic material

Abstract

A post-mountable magnetic device comprising: (1) first and second conductive posts mountable to a substantially planar substrate, (2) a plurality of windings coupled to the first and second conductive posts, each of the plurality of windings having first and second conductive termination apertures at predetermined locations thereon, the first and second conductive termination apertures of the plurality of windings engaging and registering with the first and second conductive posts, respectively, the first and second conductive posts electrically coupling the plurality of windings, the first and second conductive posts therefore substantially within a footprint of the magnetic device and (3) a magnetic core mounted proximate the plurality of windings, the magnetic core adapted to impart a desired magnetic property to the plurality of windings, the plurality of windings and the magnetic core substantially free of a molding material to allow the magnetic device to assume a smaller overall device volume.

Claims

1. A magnetic device, comprising:

a plurality of substantially uniform conductive posts having co-planar termination ends and mounted on a surface of a substantially planar substrate without passing therethrough;

a plurality of windings separate from said conductive posts and having conductive termination apertures at predetermined locations thereon, said conductive termination apertures engaging and registering with one of said conductive posts, said conductive posts substantially located within a footprint of said magnetic device; and

a magnetic core mounted proximate said windings and adapted to impart a desired magnetic property thereto, said windings and said magnetic core free of a winding header to allow said magnetic device to assume a smaller overall device volume.

2. The magnetic device as recited in claim 1 wherein said substantially planar substrate has a window defined therein, said magnetic core capable of being at least partially recessed within said window thereby to allow said magnetic device to assume a lower profile.

3. The magnetic device as recited in claim 1 wherein a combined thickness of said windings is less than a height of one of said conductive posts.

4. The magnetic device as recited in claim 1 wherein said windings are separate and mechanically joined by said conductive posts.

5. The magnetic device as recited in claim 1 wherein said windings form portions of a multi-layer flex circuit and said conductive termination apertures are formed as vias in said multi-layer flex circuit.

6. The magnetic device as recited in claim 1 wherein said magnetic core surrounds and passes through a central aperture in said windings.

7. The magnetic device as recited in claim 1 wherein said windings form primary and secondary windings of a power transformer.

8. The magnetic device as recited in claim 1 further comprising a plurality of solder preforms coupled to one of said conductive posts, said solder preforms reflowable to solder one of said conductive termination apertures to said conductive posts.

9. The magnetic device as recited in claim 1 wherein said magnetic core comprises first and second core-halves.