Common mode filter

Patent metadata

Field	Value
Publication number	US-10193516-B2
Application number	US-201715461303-A
Country	US
Kind code	B2
Filing date	Mar 16, 2017
Priority date	Mar 30, 2016
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

Disclosed herein is a common mode filter that includes first and second terminal electrodes provided on the first flange part, third and fourth terminal electrodes provided on the second flange part, a first wire wound around the winding core part and having one end connected to the first terminal electrode and other end connected to the third terminal electrode, and a second wire wound around the winding core part and having one end connected to the second terminal electrode and other end connected to the fourth terminal electrode. The winding core part includes a first winding region, a second winding region, and a third winding region positioned between the first and second winding regions in the axial direction. The first and second wires are bifilar-wound in the first and second winding regions and layer-wound in the third winding region.

First claim

What is claimed is:

1. A common mode filter comprising:
a core including a winding core part extending in an axial direction, a first flange part provided at one end of the winding core part in the axial direction, and a second flange part provided at other end of the winding core part in the axial direction;
first and second terminal electrodes provided on the first flange part;
third and fourth terminal electrodes provided on the second flange part;
a first wire wound around the winding core part and having one end connected to the first terminal electrode and other end connected to the third terminal electrode; and
a second wire wound around the winding core part and having one end connected to the second terminal electrode and other end connected to the fourth terminal electrode,
wherein the winding core part includes a first winding region, a second winding region, and a third winding region positioned between the first and second winding regions in the axial direction, and
wherein the first and second wires are bifilar-wound in the first and second winding regions and layer-wound in the third winding region.

2. The common mode filter as claimed in claim 1 , wherein a number of turns of the first and second wires in the first winding region is a same as that of the first and second wires in the second winding region.

3. The common mode filter as claimed in claim 1 ,
wherein the third winding region includes a first layer region positioned on the first winding region side and a second layer region positioned on the second winding region side, and
wherein the first and second wires cross each other between the first and second layer regions.

4. The common mode filter as claimed in claim 3 , wherein a number of turns of the first and second wires in the first layer region is a same as that of the first and second wires in the second layer region.

5. The common mode filter as claimed in claim 3 ,
wherein the second wire is wound on the first wire in the first layer region, and
wherein the first wire is wound on the second wire in the second layer region.

6. The common mode filter as claimed in claim 1 , wherein the first and second wires are bifilar-wound in the first and second winding region such that a space is formed between adjacent turns of the first and second wires.

7. The common mode filter as claimed in claim 1 ,
wherein each of the first and second flange parts has an inner side surface connected to the winding core part, and
wherein the first and second wires are separated from the inner side surface.

8. A common mode filter comprising:
a core having first, second, third and fourth sections, the second and third sections being positioned between the first and fourth sections; and
first and second wires wound around the first, second, third and fourth sections of the core,
wherein the first and second wires cross each other between the second and third sections,
wherein the first and second wires are wound in parallel with each other in the first and fourth sections, and
wherein one of the first and second wires is wound on other of the first and second wires in the second and third sections.

9. The common mode filter as claimed in claim 8 , wherein the first wire is wound on the second wire in the second and third sections.

10. The common mode filter as claimed in claim 8 ,
wherein the first wire is wound on the second wire in the second section, and
wherein the second wire is wound on the first wire in the third section.

11. The common mode filter as claimed in claim 8 ,
wherein the first wire includes an i th turn wound on the first section,
wherein the second wire includes j th and j+1 th turns wound on the first section,
wherein the i th turn of the first wire is positioned between the j th and j+1 th turns of the second wire, and
wherein a distance between the i th turn of the first wire and the j th turn of the second wire is smaller than a distance between the i th turn of the first wire and the j+1 th turn of the second wire.

12. The common mode filter as claimed in claim 11 ,
wherein the first wire further includes an i+1 th turn wound on the first section,
wherein a distance between the j+1 th turn of the second wire and the i+1 th turn of the first wire is smaller than a distance between the j+1 th turn of the second wire and the i th turn of the first wire.

13. The common mode filter as claimed in claim 8 , wherein a number of turns of the first and second wires in each of the first and fourth sections is smaller than that of the first and second wires in each of the second and third sections.

14. A common mode filter comprising:
a core having first, second, third and fourth sections; and
first and second wires wound around the first, second, third and fourth sections of the core,
wherein the first and second wires are wound in parallel with each other in the first and fourth sections,
wherein the first wire is wound on the second wire in the second section, and
wherein the second wire is wound on the first wire in the third section.

15. The common mode filter as claimed in claim 14 , wherein a number of turns of the first and second wires in each of the first and fourth sections is smaller than that of the first and second wires in each of the second and third sections.

Assignees

• Tdk Corp

Inventors

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

Classifications

• H03H2001/0035

  Wound magnetic core · CPC title

• H03H7/427

  Common-mode filters (H02J3/01 and H02M1/126 takes precedence) · CPC title

• H01F2017/0093

  Common mode choke coil · CPC title

• H01F41/069

  Winding two or more wires, e.g. bifilar winding · CPC title

• H01F27/2823

  Wires (H01F27/2866 takes precedence) · CPC title