Current-compensated choke and circuit arrangement with a current-compensated choke

Patent metadata

Field	Value
Publication number	US-9305695-B2
Application number	US-69753810-A
Country	US
Kind code	B2
Filing date	Feb 1, 2010
Priority date	Aug 1, 2007
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

A current-compensated choke features several current paths and includes several windings that are connected in parallel and wound around a common core. The windings preferably are alternately wound on the core in such a way that windings of a common current path are not arranged directly one on top of another.

First claim

What is claimed is:

1. A current-compensated choke with two current paths, wherein each current path comprises a plurality of windings that are connected in parallel and wound on a common core, wherein each winding forms an individual layer around the core such that each individual layer includes only one winding, wherein the individual layers lie one on top of another and are at least partially laterally offset from one another, and wherein the windings belonging to the two current paths are alternately arranged one on top of another; and
wherein the windings are arranged in such a way that magnetic fields generated by the current paths at least for the most part compensate one another, wherein all windings have the same winding direction, which allows cancellation of magnetic fields caused by current paths having opposite directions;
wherein the current-compensated choke further comprises a cap, wherein the windings are substantially surrounded by the cap and wherein the cap serves as part of the core.

2. The current-compensated choke according to claim 1 , wherein the core comprises a ferromagnetic material.

3. The current-compensated choke according to claim 1 , wherein the core has the shape of a rod.

4. The current-compensated choke according to claim 1 , further comprising a cover plate, wherein the core surrounded by the current paths is provided with the cover plate.

5. The current-compensated choke according to claim 1 , further comprising a plurality of external contacts, wherein the current paths are each connected to two external contacts.

6. The current-compensated choke according to claim 1 , wherein the current paths have a substantially identical resistance.

7. The current-compensated choke according to claim 6 , wherein the current paths have a substantially identical resistance based on a length ratio of the individual windings.

8. A current-compensated choke with a first current path and a second current path, wherein each current path comprises a first winding and a second winding that are connected in parallel and wound on a common core;
wherein each winding forms an individual layer around the core and each individual layer includes only one winding, wherein a wire from a first individual layer lies at least partially within an intermediate space between two wires of a second individual layer adjacent to the first individual layer;
wherein the individual layers lie on top of another in such a manner that the first winding of the first current path is followed by the first winding of the second current path, the first winding of the second current path is followed by the second winding of the first current path, and the second winding of the first current path is followed by the second winding of the second current path, wherein the windings are arranged in such a way that magnetic fields generated by the current paths at least for the most part compensate one another, wherein the windings belonging to each of the current paths have opposite winding direction, which allows cancellation of magnetic fields caused by current paths having the same direction;
wherein the first winding of the second current path has a greater distance from the core than the first winding of the first current path, the second winding of the first current path has a greater distance from the core than the first winding of the second current path, and the second winding of the second current path has a greater distance from the core than the second winding of the first current path; and
wherein the current-compensated choke further comprises a cap, wherein the windings are substantially surrounded by the cap.

9. The current-compensated choke according to claim 8 , wherein the core comprises a ferromagnetic material.

10. The current-compensated choke according to claim 8 , wherein the core has the shape of a rod.

11. The current-compensated choke according to claim 8 , further comprising a cover plate, wherein the core surrounded by the current paths is provided with the cover plate.

12. The current-compensated choke according to claim 8 , further comprising a plurality of external contacts, wherein the current paths are each connected to two external contacts.

13. The current-compensated choke according to claim 8 , wherein the current paths have a substantially identical resistance.

14. The current-compensated choke according to claim 13 , wherein the current paths have a substantially identical resistance based on a length ratio of the individual windings.

15. A current-compensated choke with two current paths, wherein each current path comprises a plurality of windings that are connected in parallel and wound on a common core, wherein each winding forms an individual layer around the core such that each individual layer includes only one winding, wherein the individual layers lie at least partially laterally offset and one on top of another, and wherein the windings belonging to the two current paths are alternately arranged one on top of another; and
wherein the windings are arranged in such a way that magnetic fields generated by the current paths at least for the most part compensate one another, wherein all windings have the same winding direction, which allows cancellation of magnetic fields caused by current paths having opposite directions.

16. A current-compensated choke with a first current path and a second current path, wherein each current path comprises a first winding and a second winding that are connected in parallel and wound on a common core;
wherein each winding forms an individual layer around the core and each individual layer includes only one winding, wherein a wire from a first individual layer lies at least partially within an intermediate space between two wires of a second individual layer adjacent to the first individual layer;
wherein the individual layers lie on top of another in such a manner that the first winding of the first current path is followed by the first winding of the second current path, the first winding of the second current path is followed by the second winding of the first current path, and the second winding of the first current path is followed by the second winding of the second current path, wherein the windings are arranged in such a way that magnetic fields generated by the current paths at least for the most part compensate one another, wherein the windings belonging to each of the current paths have opposite winding directions, which allows cancellation of magnetic fields caused by current paths having the same direction; and
wherein the first winding of the second current path has a greater distance from the core than the first winding of the first current path, the second winding of the first current path has a greater distance from the core than the first winding of the second current path, and the second winding of the second current path has a greater distance from the core than the second winding of the first current path.

Assignees

• Karasek Manfred
• Straub Markus
• Epcos Ag

Inventors

• Karasek Manfred
• Straub Markus

Classifications

• H01F19/08 Primary

  Transformers having magnetic bias, e.g. for handling pulses · CPC title

• H01F2017/0093

  Common mode choke coil · CPC title

• H01F5/00

  Coils (superconducting coils H01F6/06; fixed inductances of the signal type H01F17/00) · CPC title

• H01F27/385

  for reducing harmonics · CPC title

• H01F27/02

  Casings · CPC title