Flat coil windings, and inductive devices and electronics assemblies that utilize flat coil windings

• US 9,378,885 B2
• Filed: 03/13/2013
• Issued: 06/28/2016
• Est. Priority Date: 03/27/2012
• Status: Active Grant

• Current Assignee: Pulse Electronics Incorporated (Yageo Corporation)
• Original Assignee: Pulse Electronics Incorporated (Yageo Corporation)
• Inventors: Hongzhong, Ma, Lu, Robert
• Primary Examiner(s): Lian, Mangtin
• Application Number:
  US13/802,033
• Publication Number:
  US 20130278371A1
• Time in Patent Office: 1,203 Days
• Field of Search: 336/192, 336/232, 336/170, 336/212, 336 65- 68, 336/220, 336/221, 336/182
• US Class Current: 1/1
• CPC Class Codes: H01F 27/2852 Construction of conductive connections, of leads
• CPC Class Codes: H01F 27/2871 Pancake coils
• CPC Class Codes: H01F 27/292 Surface mounted devices
• CPC Class Codes: H01F 5/00 Coils superconducting coils H01F6/06; fixed inductances of the signal type H01F17/00

Abstract

A low cost, reduced form factor, high performance electronic device for use in electronic circuits and methods. In one exemplary embodiment, the device includes a unitary header assembly construction that ensures device coplanarity and also includes vertically oriented terminal pins. The device utilizes preconfigured flat coil windings that are disposed directly within a planar core. The flat coil windings further include features that are configured to mate with the header assembly terminal pins which substantially simplify the manufacturing process. Methods for manufacturing the device are also disclosed.

Claims

1. An inductive device, comprising:

a header assembly comprising a plurality of terminals;

at least one core;

one or more flat coil windings disposed in proximity to the at least one core and electrically coupled with respective ones of the terminals; and

a notch located on at least one of the one or more flat coil windings, the notch comprising two or more angled surfaces, the notch configured to place the entirety of the at least one of the one or more flat coil windings further away from an adjacent terminal so as to reduce a high voltage potential shorting between the at least one of the one or more flat coil windings and the adjacent terminal;

wherein a first one of the one or more flat coil windings comprises a first rectangular terminal aperture located at a first level and a second rectangular terminal aperture located at a second level, a width of the first one of the one or more flat coil windings being substantially uniform over the entirety of the first one of the one or more flat coil windings; and

wherein the first level resides at a different level than the second level within the inductive device.

2. The inductive device of claim 1, wherein the first terminal aperture is configured to receive a portion of a first terminal.

3. The inductive device of claim 2, wherein the second terminal aperture is configured to receive a portion of a second terminal.

4. The inductive device of claim 3, wherein the first terminal aperture is associated with a primary winding of a transformer and the second terminal aperture is associated with a secondary winding of the transformer.

5. The inductive device of claim 1, wherein at least a portion of the plurality of terminals comprise a chamfer feature.

6. The inductive device of claim 5, wherein the chamfer feature is configured to facilitate insertion of the respective terminal into a terminal aperture of the one or more flat coil windings.

7. The inductive device of claim 1, wherein the one or more flat coil windings comprises at least three discrete flat coil windings.

8. The inductive device of claim 1, wherein the header assembly further comprises:

a polymer carrier that defines a core receiving feature;

wherein the plurality of terminals each comprise a flat coil receiving end and a printed circuit board mating end.

9. The inductive device of claim 8, wherein the core receiving feature comprises a cavity, the cavity having one or more standoff features disposed therein.

10. The inductive device of claim 9, wherein the at least one core includes a standoff receiving feature, the standoff receiving feature sized to accommodate the one or more standoff features.

11. The inductive device of claim 8, wherein the flat coil receiving end comprises a vertically oriented terminal having a chamfered feature disposed thereon.

12. A flat coil winding, comprising:

a metal winding comprising a width and a thickness, the width being greater in dimension than the thickness, the metal winding further comprising one or more elongated terminal receiving apertures disposed at one or more ends of the metal winding; and

a notch comprising two or more angled surfaces, the notch configured to provide an additional distance between the entirety of the metal winding and an adjacent terminal on an inductive device to which the flat coil winding is ultimately positioned and reduce high potential shorting between the metal winding and the adjacent terminal;

wherein the metal winding is wound into a spiral of two or more loops characterized by an inner radius and an outer radius where a difference between the outer radius and the inner radius is the width; and

wherein the width of the metal winding at the one or more ends is substantially the same as the width of the metal winding at the two or more loops.

13. The flat coil winding of claim 12, wherein the one or more terminal receiving apertures are substantially rectangular in shape.

14. An electronics assembly comprising:

a power source;

a printed circuit board; and

an inductive device mounted on the printed circuit board that is in electrical communication with the power source, the inductive device comprising;

a header assembly comprising a plurality of terminals;

at least one core;

two or more flat coil windings each comprising a plurality of turns and one or more rectangular terminal apertures disposed at one or more ends of the respective flat coil winding, the two or more flat coil windings interleaved with each other and disposed in proximity to the at least one core and electrically coupled with respective ones of the plurality of terminals; and

a notch located on at least one of the two or more flat coil windings, the notch comprising a plurality of surfaces that are angled with respect to one another, the notch configured to place the entirety of the at least one of the two or more flat coil windings further away from an adjacent terminal to reduce high voltage potential shorting between the at least one of the two or more flat coil windings and the adjacent terminal;

wherein a width of the two or more flat coil windings at the one or more ends is substantially the same as a width of the two or more flat coil windings at a turn thereof.

15. The electronics assembly of claim 14, wherein the inductive device is configured to provide a lower direct current resistance than a comparable inductive device comprised of printed circuit board windings.