Coil unit and wireless power transmission device

Patent metadata

Field	Value
Publication number	US-10014105-B2
Application number	US-201514661675-A
Country	US
Kind code	B2
Filing date	Mar 18, 2015
Priority date	Mar 25, 2014
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

A coil unit includes a non-magnetic conductive plate which is disposed along an axis of a coil, and a magnetic body. The magnetic body includes a first portion which is positioned in an outer side than an outline of one side of the conductive plate in the axis direction of the coil, and a second portion which is positioned in an outer side than an outline of the other side of the conductive plate in the axis direction of the coil. When viewing from the axis direction of the coil, the first and second portions are positioned on a side of the conductive plate where is opposite to a side which faces the coil.

First claim

What is claimed is:

1. A coil unit of a wireless power transmission device which wirelessly transmits power from a transmission side to a power receiving side, comprising:
a coil including a winding wire wound in a helical shape along an axis of the coil;
a non-magnetic conductive plate which (1) is disposed along the axis of the coil on one side of the coil and (2) has first and second ends; and
a magnetic body positioned on an opposite side of the non-magnetic conductive plate from the coil; wherein:
the magnetic body includes:
a first portion which extends beyond the first end of the non-magnetic conductive plate along the axis of the coil;
a second portion which extends beyond the second end of the non-magnetic conductive plate along the axis of the coil; and
a third portion which extends between the first portion and the second portion; and
the first, second and third portions are comprised of materials such that imaginary component values of permeability of the first and second portions are smaller than an imaginary component value of permeability of the third portion.

2. A wireless power transmission device which wirelessly transmits power from a transmission coil to a power receiving coil unit facing each other, comprising:
the transmission coil includes a winding wire wound on a magnetic core; and
the power receiving coil unit includes the coil unit according to claim 1 ,
wherein, when viewing from a facing direction of the transmission coil and the power receiving coil unit, at least a part of the non-magnetic conductive plate of the coil unit extends beyond an end of the magnetic core.

3. A wireless power transmission device which wirelessly transmits power from first and second transmission coils to a power receiving coil unit facing each other, comprising:
the directions of magnetic fields generated when a current flows to the first and second transmission coils are reversed to each other, and are apposed;
a magnetic core which is disposed along an arrangement direction of the first and second transmission coils; and
the power receiving coil unit includes the coil unit according to claim 1 ,
wherein, when viewing from a facing direction of the first and second transmission coils and the power receiving coil unit, at least a part of the non-magnetic conductive plate of the coil unit extends beyond an end of the magnetic core.

4. A wireless power transmission device which wirelessly transmits power from a transmission coil unit to a power receiving coil facing each other, comprising:
the transmission coil unit includes the coil unit according to claim 1 ; and
the power receiving coil,
wherein the coil of the coil unit includes a magnetic core, and
wherein, when viewing from a facing direction of the transmission coil unit and the power receiving coil, at least a part of the non-magnetic conductive plate of the coil unit extends beyond an end of the magnetic core.

Assignees

• Tdk Corp

Inventors

• Chiyo Noritaka
• Nishiyama Tetsuya
• Terasaki Yasuhiro
• Suzuki Mitsunari

Classifications

• H02J7/70

  characterised by the mechanical construction · CPC title

• H02J50/70

  involving the reduction of electric, magnetic or electromagnetic leakage fields · CPC title

• H01F38/14 Primary

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

• H02J50/10

  using inductive coupling · CPC title

• H02J7/0042

  Electricity · mapped topic