Coil device

Patent metadata

Field	Value
Publication number	US-2018358168-A1
Application number	US-201615775174-A
Country	US
Kind code	A1
Filing date	Oct 14, 2016
Priority date	Dec 1, 2015
Publication date	Dec 13, 2018
Grant date	—

Abstract

A power transmission coil device includes a first helical coil having a first conductive wire forming a helical shape around an axis, and a second helical coil having a second conductive wire forming a helical shape around the axis, in which the first helical coil is electrically connected in parallel to the second helical coil, and the first conductive wire and the second conductive wire arranged along a direction of the axis.

First claim

1 . A coil device comprising:
a first helical coil having a first conductive wire forming a helical shape around an axis; and a second helical coil having a second conductive wire forming a helical shape around the axis, wherein the first helical coil is electrically connected in parallel to the second helical coil, and the first conductive wire is adjacent to the second conductive wire in a direction of the axis.

2 . The coil device according to claim 1 , further comprising
a magnetic member including a main surface intersecting the axis, wherein the first helical coil has a first inductance based on a distance between the first conductive wire and the main surface, the second helical coil has a second inductance based on a distance between the second conductive wire and the main surface, and the first helical coil and the second helical coil are configured such that a difference between the first inductance and the second inductance is small.

3 . The coil device according to claim 2 , wherein each of the first conductive wire and the second conductive wire is disposed in a first coil layer and disposed in a second coil layer apart from the first coil layer in the direction of the axis.

4 . The coil device according to claim 3 , wherein the first conductive wire and the second conductive wire are alternately disposed in the first coil layer and the second coil layer along a direction intersecting the axis.

5 . The coil device according to claim 3 ,
wherein the first conductive wire is disposed on an outer side of the second conductive wire in the first coil layer, the number of turns of the first conductive wire is smaller than the number of turns of the second conductive wire in the first coil layer, the second conductive wire is disposed on an outer side of the first conductive wire in the second coil layer, and the number of turns of the second conductive wire is smaller than the number of turns of the first conductive wire in the second coil layer.

6 . The coil device according to claim 2 ,
wherein the first conductive wire is disposed in a first coil layer, and the second conductive wire is disposed in a second coil layer apart from the first coil layer in the direction of the axis.

7 . The coil device according to claim 1 , further comprising
a magnetic member including a main surface intersecting the axis, wherein the first helical coil has a first inductance based on a distance between the first conductive wire and the main surface, the second helical coil has a second inductance based on a distance between the second conductive wire and the main surface, and the first helical coil and the second helical coil are configured such that a difference between the first inductance and the second inductance is large.

8 . The coil device according to claim 1 ,
wherein the first conductive wire has a first input portion and a first output portion, the second conductive wire has a second output portion and a second input portion, the first input portion is twisted with the second output portion and connected to the second input portion, and the second input portion is twisted with the first output portion and connected to the first input portion.

9 . The coil device according to claim 2 ,
wherein the first conductive wire has a first input portion and a first output portion, the second conductive wire has a second output portion and a second input portion, the first input portion is twisted with the second output portion and connected to the second input portion, and the second input portion is twisted with the first output portion and connected to the first input portion.

10 . The coil device according to claim 3 ,
wherein the first conductive wire has a first input portion and a first output portion, the second conductive wire has a second output portion and a second input portion, the first input portion is twisted with the second output portion and connected to the second input portion, and the second input portion is twisted with the first output portion and connected to the first input portion.

11 . The coil device according to claim 4 ,
wherein the first conductive wire has a first input portion and a first output portion, the second conductive wire has a second output portion and a second input portion, the first input portion is twisted with the second output portion and connected to the second input portion, and the second input portion is twisted with the first output portion and connected to the first input portion.

12 . The coil device according to claim 5 ,
wherein the first conductive wire has a first input portion and a first output portion, the second conductive wire has a second output portion and a second input portion, the first input portion is twisted with the second output portion and connected to the second input portion, and the second input portion is twisted with the first output portion and connected to the first input portion.

13 . The coil device according to claim 6 ,
wherein the first conductive wire has a first input portion and a first output portion, the second conductive wire has a second output portion and a second input portion, the first input portion is twisted with the second output portion and connected to the second input portion, and the second input portion is twisted with the first output portion and connected to the first input portion.

14 . The coil device according to claim 7 ,
wherein the first conductive wire has a first input portion and a first output portion, the second conductive wire has a second output portion and a second input portion, the first input portion is twisted with the second output portion and connected to the second input portion, and the second input portion is twisted with the first output portion and connected to the first input portion.

Assignees

• Ihi Corp

Inventors

• FURIYA Kentarou
• Tokura Susumu
• Nishimura Kenji
• Araki Jun
• Nagano Hideki

Classifications

• H02J50/10

  using inductive coupling · CPC title

• H01F38/14

  Inductive couplings {(for wireless supply or distribution of electric power using inductive coupling H02J50/10)} · CPC title

• H01F27/2828

  Construction of conductive connections, of leads · CPC title

• H01F5/00

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

• H01F27/2823 Primary

  Wires (H01F27/2866 takes precedence) · CPC title