ELECTRIC POWER FEED APPARATUS, ELECTRIC POWER FEED SYSTEM, AND ELECTRONIC APPARATUS

• US 20140008974A1
• Filed: 03/09/2012
• Published: 01/09/2014
• Est. Priority Date: 03/29/2011
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Miyamoto, Takashi
• Granted Patent: US 10,685,780 B2
• Time in Patent Office: Days
• US Class Current: 307/11
• CPC Class Codes: H01F 27/2871 Pancake coils
• 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 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment

Abstract

There are provided an electric power feed apparatus, an electric power feed system, and an electronic apparatus which are capable of performing transmission efficiency control corresponding to positions of apparatuses when electric power transmission is performed between the apparatuses through a magnetic field. The electric power feed apparatus includes an electric power transmission section including an electric power transmission coil for performing electric power transmission through a magnetic field and an auxiliary resonance section including one or a plurality of resonators. A main resonant frequency in a main resonance operation with use of the electric power transmission coil during the electric power transmission and an auxiliary resonant frequency in the resonator are different from each other. A relationship (corresponding characteristics) between a relative position between the electric power feed apparatus (an electric power transmission side) and the electronic apparatus (an electric power reception side) and transmission efficiency during electric power transmission is varied by adjustment of such a difference between the resonant frequencies.

Claims

1. An electric power feed apparatus comprising an electric power transmission section including an electric power transmission coil for performing electric power transmission through a magnetic field and an auxiliary resonance section including one or a plurality of resonators,

wherein a main resonant frequency in a main resonance operation with use of the electric power transmission coil during the electric power transmission and an auxiliary resonant frequency in the resonator are different from each other.

2. The electric power feed apparatus according to claim 1, wherein the auxiliary resonant frequency is higher than the main resonant frequency.

3. The electric power feed apparatus according to claim 1, wherein the auxiliary resonant frequency is lower than the main resonant frequency.

4. The electric power feed apparatus according to claim 1, wherein the auxiliary resonance section includes one resonator including an auxiliary coil.

5. The electric power feed apparatus according to claim 4, wherein an internal diameter of the auxiliary coil is smaller than an internal diameter of the electric power transmission coil.

6. The electric power feed apparatus according to claim 4, wherein a central point of the electric power transmission coil and a central point of the auxiliary coil are located along a substantially same axis.

7. The electric power feed apparatus according to claim 4, wherein the electric power transmission coil and the auxiliary coil are disposed on a substantially same plane.

8. The electric power feed apparatus according to claim 1, wherein the auxiliary resonance section includes a plurality of resonators each including an auxiliary coil.

9. The electric power feed apparatus according to claim 8, wherein an internal diameter of each of the auxiliary coils in the plurality of resonators is smaller than an internal diameter of the electric power transmission coil, and the internal diameters of the auxiliary coils are different from one another.

10. The electric power feed apparatus according to claim 9, wherein a central point of the electric power transmission coil and a central point of each of the auxiliary coils are located along a substantially same axis.

11. The electric power feed apparatus according to claim 10, wherein a difference value between internal diameters of the electric power transmission coil and an outermost auxiliary coil and a difference value between internal diameters of adjacent auxiliary coils are gradually increased from the electric power transmission coil side toward the central point.

12. The electric power feed apparatus according to claim 10, wherein

each of the electric power transmission coil and the auxiliary coils has an inner surface shape exhibiting anisotropy, and

a difference value between internal diameters of the electric power transmission coil and an outermost auxiliary coil and a difference value between internal diameters of adjacent auxiliary coils are larger in a major-axis direction in the inner surface shape than in a minor-axis direction.

13. The electric power feed apparatus according to claim 8, wherein the electric power transmission coil and each of the auxiliary coils in the plurality of resonators are disposed on a substantially same plane.

14. The electric power feed apparatus according to claim 8, wherein auxiliary resonant frequencies in the plurality of resonators are different from one another.

15. The electric power feed apparatus according to claim 4, wherein the electric power transmission coil and the auxiliary coil are electrically insulated from each other.

16. The electric power feed apparatus according to claim 1, wherein the main resonance operation is performed with use of the electric power transmission coil, and a predetermined capacitor element or a parasitic capacitance component.

17. An electric power feed system comprising:

one or a plurality of electronic apparatuses; and

an electric power feed apparatus performing electric power transmission to the electronic apparatuses,

wherein the electric power feed apparatus includes an electric power transmission section including an electric power transmission coil for performing electric power transmission through a magnetic field,

the electronic apparatuses each include an electric power reception section including an electric power reception coil for receiving electric power transmitted from the electric power transmission section, and

an auxiliary resonance section is included in one or more of the electric power feed apparatus, the electronic apparatus, and another apparatus as a separate body from the electric power feed apparatus and the electronic apparatus, the auxiliary resonance section including one or a plurality of resonators that each have an auxiliary resonant frequency different from a main resonant frequency in a main resonance operation with use of the electric power transmission coil or the electric power reception coil during the electric power transmission.

18. The electric power feed system according to claim 17, wherein the auxiliary resonance section is included in an auxiliary apparatus as the other apparatus.

19. An electronic apparatus comprising an electric power reception section including an electric power reception coil for receiving electric power transmitted through a magnetic field and an auxiliary resonance section including one or a plurality of resonators,

wherein a main resonant frequency in a main resonance operation with use of the electric power reception coil during the electric power transmission and an auxiliary resonant frequency in the resonator are different from each other.

20. The electronic apparatus according to claim 19, wherein the main resonance operation is performed with use of the electric power reception coil, and a predetermined capacitor element or a parasitic capacitance component.