Method of forming electromagnetic space

• US 9,818,532 B2
• Filed: 05/01/2013
• Issued: 11/14/2017
• Est. Priority Date: 12/07/2012
• Status: Active Grant

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Hatanaka, Takezo, Inoue, Masami, Tsuda, Hisashi
• Primary Examiner(s): Kim, Paul D
• Application Number:
  US14/123,143
• Publication Number:
  US 20140325830A1
• Time in Patent Office: 1,658 Days
• Field of Search: 295921, 29594, 29595, 29605-607, 296091, 307 91, 307104
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 7/00302 Overcharge protection
• CPC Class Codes: H04B 5/24 Inductive coupling
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor

Abstract

By supplying power from the power-supplying resonator to the power-receiving resonator by means of resonance, an electromagnetic space having a relatively low magnetic field strength is formed between the power-supplying resonator and the power-receiving resonator. In so doing, the position where the electromagnetic space is formed is changed by setting the frequency of the AC power supplied from an AC power source to the power-supplying module to an antiphase resonance mode or an inphase resonance mode, and the size of the electromagnetic space is changed by changing the distance between the power-supplying coil and the power-supplying resonator and the distance between the power-receiving resonator and the power-receiving coil.

Claims

1. A wireless power supply system comprising:

a power-supplying module including a power-supplying coil and a coil-shaped power-supplying resonator; and

a power-receiving module configured to receive power from the power-supplying resonator by means of resonance, the power-receiving module including a power-receiving coil and a coil-shaped power-receiving resonator,

at least one of members;

an electronic component;

a rechargeable battery; and

a metal body, being provided between the power-supplying resonator and the power-receiving resonator and on inner circumference sides of the power-supplying resonator and the power-receiving resonator,

a first distance between the power-supplying coil and the power-supplying resonator and a second distance between the power-receiving coil and the power-receiving resonator being set so that when the power is supplied from the power-supplying resonator to the power-receiving resonator by means of resonance, a magnetic field space having a magnetic field strength lower than a magnetic field strength of surroundings being formed between the power-supplying resonator and the power-receiving resonator and on the inner circumference sides of the power-supplying resonator and the power-receiving resonator as magnetic fields generated around the power-supplying resonator and the power-receiving resonator cancel each other out,

the at least one of the members being disposed in the thus formed magnetic field space.

2. The wireless power supply system according to claim 1, wherein,

when the power is supplied from the power-supplying resonator to the power-receiving resonator by means of resonance, a frequency of the power supplied to the power-supplying module is set so that a direction of a current flowing in the power-supplying resonator is opposite to a direction of a current flowing in the power-receiving resonator, to form the magnetic field space.

3. A power-supplying device comprising a power supplying coil and a coil-shaped power-supplying resonator configured to supply power to a power-receiving device including a power-receiving coil and a coil-shaped power-receiving resonator by means of resonance,

at least one of members:

an electronic component;

a rechargeable battery; and

a metal body, being provided between the power-supplying resonator and the power-receiving resonator and on inner circumference sides of the power-supplying resonator and the power-receiving resonator, and

a first distance between the power-supplying coil and the power-supplying resonator and a second distance between the power-receiving coil and the power-receiving resonator being set so that when the power is supplied from the power-supplying resonator to the power-receiving resonator by means of resonance, a magnetic field space having a magnetic field strength lower than a magnetic field strength of surroundings being formed between the power-supplying resonator and the power-receiving resonator and on the inner circumference sides of the power-supplying resonator and the power-receiving resonator as magnetic fields generated around the power-supplying resonator and the power-receiving resonator cancel each other out,

the at least one of the members being disposed in the thus formed magnetic field space.

4. The wireless power supply system according to claim 3, wherein,

when the power is supplied from the power-supplying resonator to the power-receiving resonator by means of resonance, a frequency of the power supplied to the power-supplying resonator is set so that a direction of a current flowing in the power-supplying resonator is opposite to a direction of a current flowing in the power-receiving resonator, to form the magnetic field space.

5. The power-supplying device according to claim 3, wherein the power-receiving device is mounted in a portable electronic device.

6. The power-supplying device according to claim 4, wherein the power-receiving device is mounted in a portable electronic device.

7. A power-receiving device comprising power-receiving coil and a coil-shaped power-receiving resonator configured to receive power from a power-supplying device including a power-supplying coil and a coil-shaped power-supplying resonator by means of resonance,

at least one of members:

an electronic component;

a rechargeable battery; and

a metal body, being provided between the power-supplying resonator and the power-receiving resonator and on inner circumference sides of the power-supplying resonator and the power-receiving resonator, and

a first distance between the power-supplying coil and the power-supplying resonator and a second distance between the power-receiving coil and the power-receiving resonator being set so that when the power is supplied from the power-supplying resonator to the power-receiving resonator by means of resonance, a magnetic field space having a magnetic field strength lower than a magnetic field strength of surroundings being formed between the power-supplying resonator and the power-receiving resonator and on the inner circumference sides of the power-supplying resonator and the power-receiving resonator as magnetic fields generated around the power-supplying resonator and the power-receiving resonator cancel each other out,

the at least one of the members being disposed in the thus formed magnetic field space.

8. The power-receiving device according to claim 7, wherein

during the power supply from the power-supplying resonator to the power-receiving resonator by means of resonance,

the magnetic field space is formed when the power having a frequency set so that a direction of a current flowing in the power-supplying resonator is opposite to a direction of a current flowing in the power-receiving resonator is supplied to the power-supplying resonator.

9. The power-supplying device according to claim 7, wherein, the power-receiving device is mounted in a portable electronic device.

10. The power-supplying device according to claim 8, wherein, the power-receiving device is mounted in a portable electronic device.

11. A method of forming an electromagnetic space, the method comprising the step of

when power is supplied from a power-supplying module including a power-supplying coil and a coil-shaped power-supplying resonator to a power-receiving module including a power-receiving coil and a coil-shaped power-receiving resonator by means of resonance, setting a first distance between the power-supplying coil and the power-supplying resonator and a second distance between the power-receiving coil and the power-receiving, resonator so that a magnetic field space is formed having a magnetic field strength lower than a magnetic field strength of surroundings at a position between the power-supplying resonator and the power-receiving resonator and on inner circumference sides of the power-supplying resonator and the power-receiving resonator, as magnetic fields generated around the power-supplying resonator and the power-receiving resonator cancel each other out,

at said position, at least one of members:

an electronic component;

a rechargeable battery; and

a metal body, being provided.

12. The method according to claim 11, wherein

when the power is supplied from the power-supplying resonator to the power-receiving resonator by means of resonance,

a frequency of the power supplied to the power-supplying resonator is set so that a direction of a current flowing in the power-supplying resonator is opposite to a direction of a current flowing in the power-receiving resonator, to form the magnetic field space.