Differential mode filter

Patent metadata

Field	Value
Publication number	US-10453600-B2
Application number	US-201715483099-A
Country	US
Kind code	B2
Filing date	Apr 10, 2017
Priority date	Apr 19, 2016
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

Disclosed herein is a differential mode filter including a core including a winding core part, a first wire wound around the winding core part in a first winding direction, and a second wire wound around the winding core part in a second winding direction opposite to the first winding direction. The winding core part includes first and second winding surfaces. A first crossing angle between the first and second wires that cross a plurality of times on the first winding surface is smaller than that a second crossing angle between the first and second wires that cross a plurality of times on the second winding surface.

First claim

What is claimed is:

1. A differential mode filter comprising:
a core including a winding core part;
a first wire wound around the winding core part in a first winding direction; and
a second wire wound around the winding core part in a second winding direction opposite to the first winding direction,
wherein the winding core part includes first and second winding surfaces, and
wherein a first crossing angle between the first and second wires that cross a plurality of times on the first winding surface is smaller than that a second crossing angle between the first and second wires that cross a plurality of times on the second winding surface, and
wherein each of the first and second crossing angles is less than 90 degrees.

2. The differential mode filter as claimed in claim 1 , wherein the first and second wires contact each other in an axial direction of the winding core part on the first winding surface.

3. The differential mode filter as claimed in claim 1 , wherein the winding core part has a substantially quadrangular shape in cross section perpendicular to an axial direction of the winding core part.

4. The differential mode filter as claimed in claim 1 , further comprising:
first and third terminal electrodes connected respectively to one and other ends of the first wire; and
second and fourth terminal electrodes connected respectively to one and other ends of the second wire,
wherein the core further includes a first flange part provided at one end of the winding core part in an axial direction and a second flange part provided at other end of the winding core part in the axial direction, and
wherein the first and second terminal electrodes are provided on the first flange part, and the third and fourth terminal electrodes are provided on the second flange part.

5. The differential mode filter as claimed in claim 1 , wherein the first crossing angle is defined by a smallest angle between the first and second wires that cross a plurality of times on the first winding surface, and wherein the second crossing angle is defined by a smallest angle between the first and second wires that cross a plurality of times on the second winding surface.

6. The differential mode filter as claimed in claim 1 ,
wherein the first winding surface has a first edge extending in an axial direction of the winding core part,
wherein the second winding surface has a second edge extending in the axial direction of the winding core part,
wherein the first crossing angle is an internal angle of a first triangle formed by the first wire, the second wire, and the first edge, and
wherein the second crossing angle is an internal angle of a second triangle formed by the first wire, the second wire, and the second edge.

7. The differential mode filter as claimed in claim 6 , wherein the second triangle is greater in area than the first triangle.

8. A differential mode filter comprising:
a core including a winding core part, a first flange part provided at one end of the winding core part in an axial direction, and a second flange part provided at an other end of the winding core part in the axial direction;
a first wire wound around the winding core part in a first winding direction; and
a second wire wound around the winding core part in a second winding direction opposite to the first winding direction,
wherein the winding core part includes a first winding surface on which the first and second wires cross each other and wherein the winding core part further includes a second winding surface opposite to the first winding surface, wherein the first and second wires also cross each other on the second winding surface;
wherein the first winding surface has a first region in which the first and second wires are positioned on the first flange part side and the second flange part side, respectively, a second region in which the first and second wires are positioned on the second flange part side and the first flange part side, respectively, and a third region arranged between the first and second regions;
wherein the third region is arranged between the first and second regions so that the first and second regions do not overlap with each other,
wherein the first and second wires contact each other in at least one of the first and second regions, and
wherein the first and second wires have a higher degree of parallelism on the first winding surface than on the second winding surface.

9. The differential mode filter as claimed in claim 8 , wherein the first and second wires contact each other in both the first and second regions.

10. The differential mode filter as claimed in claim 8 , wherein the first and second wires contact each other in the axial direction of the winding core part on the first region, and
wherein the first and second wires contact each other in a radial direction of the winding core part on the third region.

11. The differential mode filter as claimed in claim 9 ,
wherein the first and second wires contact each other in the axial direction of the winding core part on each of the first and second regions, and
wherein the first and second wires contact each other in a radial direction of the winding core part on the third region.

12. A device comprising:
a winding core having a first surface, a second surface, a third surface, a first edge that is a boundary between the first and third surfaces, and a second edge that is a boundary between the second and third surfaces;
a first wire wound around the winding core; and
a second wire wound around the winding core so as to cross the first wire on the first and second surfaces,
wherein the first wire has a first section located on the first surface and a second section located on the second surface,
wherein the second wire has a third section located on the first surface so as to cross the first section of the first wire and a fourth section located on the second surface so as to cross the second section of the first wire, and
wherein a first distance between the first section of the first wire and the third section of the second wire on the first edge is narrower than a second distance between the second section of the first wire and the fourth section of the second wire on the second edge.

13. The device as claimed in claim 12 , wherein the first surface is opposite to the second surface.

14. The device as claimed in claim 13 , wherein the winding core further has a fourth surface that is opposite to the third surface, a third edge that is a boundary between the first and fourth surfaces, and a fourth edge that is a boundary between the second and fourth surfaces.

15. The device as claimed in claim 14 , wherein a third distance between the first section of the first wire and the third section of the second wire on the third edge is narrower than a fourth distance between the second section of the first wire and the fourth section of the second wire on the fourth edge.

16. The device as claimed in claim 15 , wherein the first distance is narrower than the fourth distance.

17. The device as claimed in claim 16 , wherein the third distance is narrower than the second distance.

18. The device as claimed in claim 17 , wherein the first distance is substantially a same as the third distance.

19. The device as claimed in claim 17 , wherein the second distance is substantially a same as the fourth distance.

20. The device as claimed in claim 12 , a contact length of the first section of the first wire and the third section of the second wire is greate

Assignees

• Tdk Corp

Inventors

• Kobayashi Tsutomu
• Tomonari Toshio
• Ito Emi
• Koyama Yuma

Classifications

• H01F17/045

  with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core · CPC title

• H01F19/04

  Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range (resonant circuits H03H) · CPC title

• H01F27/2823 Primary

  Wires (H01F27/2866 takes precedence) · CPC title

• H01F2027/2838

  using transposed wires · CPC title

• H01F27/24

  Magnetic cores · CPC title