WIRELESS POWER TRANSMISSION DEVICE

• US 20160072306A1
• Filed: 01/06/2015
• Published: 03/10/2016
• Est. Priority Date: 01/06/2014
• Status: Abandoned Application

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: TSUDA, Hisashi, HATANAKA, Takezo, VU, Nam Tung
• Application Number:
  US14/784,520
• Publication Number:
  US 20160072306A1
• Time in Patent Office: Days
• US Class Current: 1/1
• 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

Abstract

There is provided a wireless power transmission apparatus including: a power-supplying module configured to supply power to a power-receiving module by means of a resonance phenomenon which is established between the power-supplying module and the power-receiving module so that a magnetic field space having a lower magnetic field strength than that of nearby portions is formed; a magnetic field detector which is disposed at a position where the magnetic field space is formed and which is configured to detect the magnetic field strength; and a determination control device configured to determine whether there is an anomaly in power supply to the power-receiving module based on a value of the magnetic field strength detected by the magnetic field detector.

Claims

1. A wireless power transmission apparatus comprising:

a power-supplying module configured to supply power to a power-receiving module by means of a resonance phenomenon which is established between the power-supplying module and the power-receiving module so that a magnetic field space having a lower magnetic field strength than that of nearby portions is formed;

a magnetic field detector which is disposed at a position where the magnetic field space is formed and which is configured to detect the magnetic field strength; and

a determination control device configured to determine whether there is an anomaly in power supply to the power-receiving module based on a value of the magnetic field strength detected by the magnetic field detector.

2. The wireless power transmission apparatus according to claim 1, wherein the determination control device is configured to stop power supply to the power-supplying module when determining that there is an anomaly in the power supply.

3. The wireless power transmission apparatus according to claim 1, further comprising a reporting device configured to give a report to an outside, wherein,

when the determination control device determines that there is an anomaly in the power supply, the determination control device controls the reporting device to report the anomaly in the power supply.

4. The wireless power transmission apparatus according to claim 1, wherein:

the power-supplying module and the power-receiving module respectively include at least a power-supplying resonator and a power-receiving resonator which resonate with each other at a predetermined resonance frequency; and

a power-source frequency of a power source is set to a frequency higher than the resonance frequency so that current in the power-supplying resonator and current in the power-receiving resonator flow in directions opposite to each other during power supply by means of the resonance phenomenon from the power-supplying resonator to the power-receiving resonator.

5. The wireless power transmission apparatus according to claim 1, wherein:

the power-supplying module and the power-receiving module respectively include at least a power-supplying resonator and a power-receiving resonator which resonate with each other at a predetermined resonance frequency; and

a power-source frequency of a power source is set to a frequency lower than the resonance frequency so that current in the power-supplying resonator and current in the power-receiving resonator flow in a same direction during power supply by means of the resonance phenomenon from the power-supplying resonator to the power-receiving resonator.

6. The wireless power transmission apparatus according to claim 1, wherein the magnetic field detector is a Hall-effect magnetic sensor.

7. The wireless power transmission apparatus according to claim 1, wherein the magnetic field detector is a coil.

8. The wireless power transmission apparatus according to claim 4, wherein:

the power-supplying resonator includes a coil; and

the magnetic field detector is disposed between a central axis of the coil and an inner circumferential surface of the coil, and closer to the inner circumferential surface of the coil rather than the central axis of the coil.

9. The wireless power transmission apparatus according to claim 8, wherein the magnetic field detector is disposed at a position along the inner circumferential surface of the coil.

10. The wireless power transmission apparatus according to claim 4, wherein:

each of the power-supplying resonator and the power-receiving resonator includes a coil; and

the magnetic field detector is disposed on an inner circumference side of the coil of power-supplying resonator, and closer to a facing portion of the coil of the power-supplying resonator which faces the coil of the power-receiving resonator than the other portion of the coil of the power-supplying resonator which does not face the coil of the power-receiving resonator.

11. The wireless power transmission apparatus according to claim 10, wherein the magnetic field detector is disposed at a position on a plane defined by the facing portion of the coil of the power-supplying resonator which faces the coil of the power-receiving resonator.

12. The wireless power transmission apparatus according to claim 4, wherein:

the power-supplying resonator includes a coil;

the magnetic field detector is a Hall-effect magnetic sensor configured to detect the magnetic field strength by using Hall effect to a thin plate-like semiconductor included therein; and

the Hall-effect magnetic sensor is disposed so that the thin plate-like semiconductor is oriented orthogonal to a direction of the central axis of the coil of the power-supplying resonator, on an inner circumference side of the coil of the power-supplying resonator.