Common mode choke coil

Patent metadata

Field	Value
Publication number	US-10210991-B2
Application number	US-201816046290-A
Country	US
Kind code	B2
Filing date	Jul 26, 2018
Priority date	Jun 17, 2016
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

A common mode choke coil according to one embodiment of the present invention includes a first coil conductor, a second coil conductor, and a third coil conductor. In the embodiment, the second coil conductor has a different shape than the first coil conductor and the third coil conductor. In the embodiment, the first coil conductor, the second coil conductor, and the third coil conductor extend parallel with each other in a first region in plan view as seen from an axial direction along the coil axis. In the embodiment, in the first region, when seen in a cross section cut along a plane including the coil axis, in an n-th turn, an arranging order of the first coil conductor, the second coil conductor, and the third coil conductor from an inner side in a radial direction thereof is inverted from that in an n+1th turn.

First claim

What is claimed is:

1. A common mode choke coil, comprising:
a first coil conductor provided on a first coil forming surface in a first insulator and wound around a coil axis;
a second coil conductor provided on a second coil forming surface in the first insulator and wound around the coil axis; and
a third coil conductor provided on a third coil forming surface in the first insulator and wound around the coil axis,
wherein the second coil conductor has a different shape than the first coil conductor and the third coil conductor,
the first coil conductor, the second coil conductor, and the third coil conductor extend parallel with each other in a first region in plan view as seen from an axial direction along the coil axis, and
in the first region, when seen in a cross section cut along a plane including the coil axis, an arranging order of the first coil conductor, the second coil conductor, and the third coil conductor from a radially inner side thereof is inverted between an n-th turn and an n+1th turn (where n is such a positive real number that n+1 exceeds none of a number of turns of the first coil conductor, a number of turns of the second coil conductor, and a number of turns of the third coil conductor).

2. The common mode choke coil according to claim 1 , wherein
the first coil conductor and the second coil conductor, the second coil conductor and the third coil conductor, or the third coil conductor and the first coil conductor are formed in the same shape in plan view as seen from the axial direction.

3. The common mode choke coil according to claim 1 , wherein
in the first region, a line segment of the first coil conductor in the n+1th turn, a line segment of the second coil conductor in the n+1th turn, and a line segment of the third coil conductor in the n+1th turn are plane-symmetrical to a line segment of the first coil conductor in the n-th turn, a line segment of the second coil conductor in the n-th turn, and a line segment of the third coil conductor in the n-th turn, respectively, with respect to a first virtual plane extending through a midpoint between the line segment of the first coil conductor in the n-th turn and the line segment of the first coil conductor in the n+1th turn and extending parallel with the coil axis.

4. The common mode choke coil according to claim 1 , wherein
in the first region, a stray capacity generated between a line segment of the first coil conductor in the n-th turn and a line segment of the second coil conductor in the n-th turn, a stray capacity generated between the line segment of the first coil conductor in the n-th turn and a line segment of the third coil conductor in the n-th turn, and a stray capacity generated between the line segment of the second coil conductor in the n-th turn and the line segment of the third coil conductor in the n-th turn are equal to each other.

5. The common mode choke coil according to claim 1 , wherein
the first coil forming surface, the second coil forming surface, and the third coil forming surface are separate from each other.

6. The common mode choke coil according to claim 1 , wherein
the first coil forming surface and the second coil forming surface, the second coil forming surface and the third coil forming surface, or the third coil forming surface and the first coil forming surface are the same.

7. The common mode choke coil according to claim 1 , wherein
in a second region in plan view as seen from the axial direction, the first coil conductor, the second coil conductor, and the third coil conductor are provided so that, in plan view as seen from the axial direction, each of these coil conductors crosses over at least one of the other coil conductors and so that, when seen in a cross section cut along a plane including the coil axis, these coil conductors do not cross over each other.

8. The common mode choke coil according to claim 7 , wherein
all of a line segment of the first coil conductor in the n-th turn, a line segment of the second coil conductor in the n-th turn, and a line segment of the third coil conductor in the n-th turn are longer in the first region than in the second region.

9. The common mode choke coil according to claim 1 , wherein
a distance between an innermost one of respective line segments of the first coil conductor, the second coil conductor, and the third coil conductor in the n-th turn and an outermost one of respective line segments of the first coil conductor, the second coil conductor, and the third coil conductor in the n+1th turn is shorter than any of a distance in the first region between the first coil conductor and the second coil conductor, a distance in the first region between the second coil conductor and the third coil conductor, and a distance in the first region between the third coil conductor and the first coil conductor.

10. The common mode choke coil according to claim 1 , further comprising:
a first terminal electrode;
a second terminal electrode;
a third terminal electrode;
a fourth terminal electrode;
a fifth terminal electrode;
a sixth terminal electrode;
a first extraction conductor configured to connect an outer side end portion of the first coil conductor to the first terminal electrode;
a second extraction conductor configured to connect an inner side end portion of the first coil conductor to the second terminal electrode;
a third extraction conductor configured to connect an outer side end portion of the second coil conductor to the third terminal electrode;
a fourth extraction conductor configured to connect an inner side end portion of the second coil conductor to the fourth terminal electrode;
a fifth extraction conductor configured to connect an outer side end portion of the third coil conductor to the fifth terminal electrode; and
a sixth extraction conductor configured to connect an inner side end portion of the third coil conductor to the sixth terminal electrode.

11. The common mode choke coil according to claim 1 , further comprising:
an insulating upper dummy layer provided above the first insulator; and
an insulating lower dummy layer provided below the first insulator,
wherein the upper dummy layer and the lower dummy layer are each formed of a magnetic material.

12. The common mode choke coil according to claim 1 , further comprising:
a first coil unit including the first coil conductor, the second coil conductor, and the third coil conductor; and
a second coil unit provided opposite to the first coil unit,
wherein the second coil unit includes:
a fourth coil conductor provided on a fourth coil forming surface in a second insulator and wound around the coil axis;
a fifth coil conductor provided on a fifth coil forming surface in the second insulator and wound around the coil axis; and
a sixth coil conductor provided on a sixth coil forming surface in the second insulator and wound around the coil axis,

wherein the sixth coil conductor is electrically connected to the first coil conductor,
the fifth coil conductor is electrically connected to the second coil conductor,
the fourth coil conductor is electrically connected to the third coil conductor, and
when the second coil unit is seen in a cross section cut along a plane including the coil axis, an arranging order of the fourth coil conductor, the fifth coil conductor, and the sixth coil conductor from a radially inner side thereof is inverted between an n-th turn and an n+1th turn.

13. The common mode choke coil according to claim 1 , further comprising:
a first coil unit including the first coil conductor, the second coil conductor, and the third coil conductor; and
a second

Assignees

• Taiyo Yuden Kk

Inventors

• Fukushima Akira
• Nogi Kenichiro
• Shimizu Masayuki
• Hoshino Akihiro

Classifications

• H01F27/2804

  Printed windings · CPC title

• H01F27/24

  Magnetic cores · CPC title

• H01F27/28

  Coils; Windings; Conductive connections · CPC title

• H01F27/324

  Insulation between coil and core, between different winding sections, around the coil; Other insulation structures · CPC title

• H01F27/323

  Insulation between winding turns, between winding layers · CPC title