POWER RECEIVING DEVICE AND POWER FEEDING SYSTEM

• US 20130307346A1
• Filed: 04/05/2013
• Published: 11/21/2013
• Est. Priority Date: 05/17/2012
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Arisawa, Shigeru, Uramoto, Yoichi, Kiyakawauchi, Tamotsu
• Granted Patent: US 10,438,741 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• 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 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 7/00302 Overcharge protection

Abstract

A power receiving coil and a measuring coil are in a power receiving device. The measuring coil is inductively coupled to the power receiving coil. Concentric turns of a wire in the measuring coil are around a common axis. Also around the common axis are concentric turns of a wire in the power receiving coil. At least one of the concentric turns of the wire in the measuring coil is closer to the common axis than each of the concentric turns of the wire in the power receiving coil. A power feeding device receives a control signal from the power receiving device. The control signal instructs the power feeding device to adjust a power level of an electromagnetic wave emission.

Claims

1. A power receiving device comprising:

a measuring coil having a measuring coil wire, a number of concentric turns of the measuring coil wire being around a common axis; and

a power receiving coil having a power receiving coil wire, a number of concentric turns of the power receiving coil wire being around said common axis,

wherein said power receiving coil is configured to be inductively coupled to said measuring coil, at least one of the concentric turns of the measuring coil wire being closer to said common axis than each of the concentric turns of the power receiving coil wire.

2. A power receiving device according to claim 1, wherein at least one of the concentric turns of the power receiving coil wire is closer to said common axis than a different one of the concentric turns of the measuring coil wire.

3. A power receiving device according to claim 2, wherein said different one of the turns of the measuring coil wire is farther from said common axis than said each of the turns of the power receiving coil wire.

4. A power receiving device according to claim 1, wherein said number of concentric turns of the measuring coil wire differs from said number of concentric turns of the power receiving coil wire.

5. A power receiving device according to claim 1, wherein said number of concentric turns of the measuring coil wire is less than said number of concentric turns of the power receiving coil wire.

6. A power receiving device according to claim 1, wherein said measuring coil is in physical contact with said power receiving coil.

7. A power receiving device according to claim 1, wherein said measuring coil is coplanar with said power receiving coil.

8. A power receiving device according to claim 1, wherein said measuring coil and said power receiving coil are on different planes.

9. A power receiving device according to claim 8, wherein said different planes are parallel planes.

10. A power receiving device according to claim 1, wherein each of the concentric turns of the measuring coil wire is a loop of the measuring coil wire, said each of the concentric turns of the power receiving coil wire being a loop of the power receiving coil wire.

11. A power receiving device according to claim 10, wherein said each of the concentric turns of the measuring coil wire is wound around a center of the measuring coil, said each of the concentric turns of the power receiving coil wire being wound around a center of the power receiving coil.

12. A power receiving device according to claim 1, wherein said power receiving coil is ohmically isolated from said measuring coil.

13. A power feeding system comprising:

the power receiving device of claim 1; and

a power feeding device configured to receive a control signal from said power receiving device, said control signal instructing said power feeding device to adjust a power level of an electromagnetic wave emission.

14. A power feeding system according to claim 13, wherein a power feeding coil in the power feeding device is configured to radiate said electromagnetic wave emission, said power receiving coil being configured to receive said electromagnetic wave emission.

15. A power feeding system according to claim 13, wherein said control signal indicates an occurrence of a change in an impedance of the power receiving coil.

16. A power receiving device according to claim 15, wherein a variance of current flowing through said measuring coil wire and a variance of current flowing through said power receiving coil wire are used to detect said change in the impedance.

17. A power feeding system according to claim 15, wherein said change in the impedance indicates a presence or absence of conductive foreign matter in a pathway between said power feeding device and said power receiving device.

18. A power feeding system according to claim 17, wherein said electromagnetic wave emission propagates along said pathway.