Power reception device, power transmission device, and power transfer system

Patent metadata

Field	Value
Publication number	US-9711282-B2
Application number	US-201114345063-A
Country	US
Kind code	B2
Filing date	Sep 28, 2011
Priority date	Sep 28, 2011
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

A power reception device includes a power reception unit having a first capacitor, receiving electric power in a non-contact manner from an externally provided power transmission unit, a first housing case housing the power reception unit inside, and a first anchor member anchoring the first capacitor. The first housing case includes a first shield defining a region where an electromagnetic field developed around the power reception unit is emitted. The first capacitor is anchored by the first anchor member at a position spaced apart from the first shield.

First claim

The invention claimed is:

1. A power reception device comprising:
a power reception unit including a first capacitor, and receiving electric power in a non-contact manner from an externally provided power transmission unit,
a first housing case housing said power reception unit inside, and
a first anchor member anchoring said first capacitor,
said first housing case including a first shield defining a region where an electromagnetic field developed around said power reception unit is emitted,
said first capacitor being anchored by said first anchor member at a position spaced apart from said first shield,
said first shield including:
a top plate; and
a first peripheral wall formed suspending from said top plate,

said first shield having a first opening formed, opposite to said top plate,
said first housing case including an insulative first lid closing said first opening, and
said first capacitor being secured to said first lid.

2. The power reception device according to claim 1 , wherein
said first capacitor includes:
a first electrode; and
a second electrode arranged opposite to said first electrode with a distance therebetween, and

a distance between said first capacitor and said first shield is greater than a distance between said first electrode and said second electrode.

3. The power reception device according to claim 1 , wherein
said power reception unit includes:
a first wiring connected to said first capacitor; and
a first coil connected to said first capacitor by said first wiring, and

a distance between said first shield and said first capacitor is greater than a distance between said first coil and said first capacitor.

4. The power reception device according to claim 1 , further comprising:
a first device arranged inside said first housing case, and provided spaced apart from said first capacitor,
wherein a distance between said first shield and said first capacitor is greater than a distance between said first device and said first capacitor.

5. The power reception device according to claim 1 , wherein a difference between a natural frequency of said power transmission unit and a natural frequency of said power reception unit is less than or equal to 10% the natural frequency of said power reception unit.

6. The power reception device according to claim 1 , wherein a coupling coefficient between said power reception unit and said power transmission unit is less than or equal to 0.1.

7. The power reception device according to claim 1 , wherein said power reception unit receives electric power from said power transmission unit through at least one of a magnetic field developed between said power reception unit and said power transmission unit, and oscillating at a particular frequency, and an electric field developed between said power reception unit and said power transmission unit, and oscillating at a particular frequency.

8. A power reception device comprising:
a power reception unit including a first capacitor, and receiving electric power in a non-contact manner from an externally provided power transmission unit,
a first housing case housing said power reception unit inside, and
a first anchor member anchoring said first capacitor,
said first housing case including a first shield defining a region where an electromagnetic field developed around said power reception unit is emitted,
said first capacitor being anchored by said first anchor member at a position spaced apart from said first shield,
said first capacitor including:
a first electrode; and
a second electrode arranged opposite to said first electrode with a distance therebetween,

said first anchor member including a first contact face in contact with said first capacitor, and
a region of said first contact face, located between said first electrode and said second electrode, having a trench formed.

9. A power reception device comprising:
a power reception unit including a first capacitor, and receiving electric power in a non-contact manner from an externally provided power transmission unit,
a first housing case housing said power reception unit inside, and
a first anchor member anchoring said first capacitor,
said first housing case including a first shield defining a region where an electromagnetic field developed around said power reception unit is emitted,
said first capacitor being anchored by said first anchor member at a position spaced apart from said first shield,
said first shield including:
a top plate; and
a first peripheral wall formed suspending from said top plate,

said first shield having a first opening formed, opposite to said top plate,
said first housing case including:
an insulative first lid closing said first opening; and
a first support provided at said first lid, supporting said first capacitor,

said first capacitor including:
a first electrode; and
a second electrode arranged opposite to said first electrode with a distance therebetween,

a region of an inner circumferential face of said first support, located between said first electrode and said second electrode, having a trench formed.

10. A power reception device comprising:
a power reception unit including a first capacitor, and receiving electric power in a non-contact manner from an externally provided power transmission unit,
a first housing case housing said power reception unit inside, and
a first anchor member anchoring said first capacitor,
said first housing case including a first shield defining a region where an electromagnetic field developed around said power reception unit is emitted,
said first capacitor being anchored by said first anchor member at a position spaced apart from said first shield,
said first capacitor including:
a first electrode; and
a second electrode arranged opposite to said first electrode with a distance therebetween,

said first anchor member including a first holder formed so as to cover a circumferential face of said first capacitor, and
a region of an inner circumferential face of said first holder, located between said first electrode and said second electrode, having a trench formed.

11. A power reception device comprising:
a power reception unit including a first capacitor, and receiving electric power in a non-contact manner from an externally provided power transmission unit,
a first housing case housing said power reception unit inside, and
a first anchor member anchoring said first capacitor,
said first housing case including a first shield defining a region where an electromagnetic field developed around said power reception unit is emitted,
said first capacitor being anchored by said first anchor member at a position spaced apart from said first shield,
said first capacitor including:
a first electrode; and
a second electrode arranged opposite to said first electrode with a distance therebetween,

said first anchor member including a second holder formed so as to cover an inner circumferential face of said first capacitor, and
a region of an inner circumferential face of said second holder, located between said first electrode and said second electrode, having a hole formed.

12. A power transmission device comprising:
a power transmission unit including a second capacitor, and transmitting electric power in a non-contact manner to an externally provided power reception unit,
a second housing case housing said power transmission unit inside, and
a second anchor member anchoring said second capacitor,
said second housing case including a second shield defining a region where an electromagnetic field developed around said power transmission unit is emitted,

Assignees

• Horiuchi Satoru
• Toyota Motor Co Ltd

Inventors

• Horiuchi Satoru

Classifications

• H02J50/70

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

• H02J50/12 Primary

  of the resonant type · CPC title

• B60L53/122

  Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil · CPC title

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• H01F2038/146

  in combination with capacitive coupling · CPC title