POWER TRANSMITTING DEVICE, POWER RECEIVING DEVICE, AND WIRELESS POWER TRANSMITTING SYSTEM

• US 20150001955A1
• Filed: 06/25/2014
• Published: 01/01/2015
• Est. Priority Date: 06/27/2013
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Yamada, Akiko, Shijo, Tetsu, Obayashi, Shuichi, Ishihara, Hiroaki, Onizuka, Kohei, Kudo, Hiroki, Oodachi, Noriaki, Ogawa, Kenichirou, Moritsuka, Fumi
• Granted Patent: US 10,224,748 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• 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 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices

Abstract

According to one embodiment, there is provided a power transmitting device including: a power supply, a resonator, an adjuster and a controller. The power supply supplies AC power. The resonator includes a magnetic core and a coil wound around the magnetic core, the resonator wirelessly transmitting the AC power supplied from the power supply to a different resonator arranged to be opposed to the resonator. The adjuster relatively moves the coil and the magnetic core along a longitudinal direction of the coil. The controller controls the adjuster based on a value of current flowing in the resonator to adjust relative positions of the magnetic core and the coil.

Claims

1. A power transmitting device comprising:

a power supply to supply AC (Alternating Current) power;

a resonator including a magnetic core and a coil wound around the magnetic core, the resonator wirelessly transmitting the AC power supplied from the power supply to a different resonator arranged to be opposed to the resonator;

an adjuster to relatively move the coil and the magnetic core along a longitudinal direction of the coil; and

a controller to control the adjuster based on a value of current flowing in the resonator to adjust relative positions of the magnetic core and the coil.

2. The device according to claim 1, wherein the controller adjusts the relative positions of the magnetic core and the coil such that the value of current flowing in the resonator becomes maximum, or the value of current becomes equal to or higher than a threshold value.

3. The device according to claim 1, wherein a cross section of the magnetic core is changed along a longitudinal direction of the coil in a range within which the coil is able to move relative to the magnetic core.

4. The device according to claim 1, wherein the adjuster moves only the coil out of the coil and the magnetic core.

5. The device according to claim 1, wherein the adjuster moves only the magnetic core out of the coil and the magnetic core.

6. The device according to claim 5, wherein

the magnetic core includes a plurality of magnetic blocks spaced apart from each other, and

the adjuster moves only a part of the magnetic blocks along the longitudinal direction of the coil.

7. The device according to claim 1, further comprising

a tube-shaped bobbin, wherein

the magnetic core is arranged in a hole of the bobbin,

the coil is wound around the bobbin, and

the adjuster relatively moves the bobbin and the magnetic core along the longitudinal direction of the coil.

8. A power receiving device comprising:

a resonator including a magnetic core and a coil wound around the magnetic core, the resonator wirelessly receiving AC (Alternating Current) power from a different resonator arranged to be opposed to the resonator;

an adjusting circuit to supply the AC power received by the resonator to a load;

an adjuster to relatively move the coil and the magnetic core along a longitudinal direction of the coil; and

a controller to control the adjuster based on a value of current flowing in the resonator to adjust relative positions of the magnetic core and the coil.

9. The device according to claim 8, wherein the controller adjusts the relative positions of the magnetic core and the coil such that the value of current flowing in the resonator becomes maximum, or the value of current becomes equal to or higher than a threshold value.

10. The device according to claim 8, wherein a cross section of the magnetic core is changed along a longitudinal direction of the coil in a range within which the coil is able to move relative to the magnetic core.

11. The device according to claim 8, wherein the adjuster moves only the coil out of the coil and the magnetic core.

12. The device according to claim 8, wherein the adjuster moves only the magnetic core out of the coil and the magnetic core.

13. The device according to claim 12, wherein

the magnetic core includes a plurality of magnetic blocks spaced apart from each other, and

the adjuster moves only a part of the magnetic blocks along the longitudinal direction of the coil.

14. The device according to claim 8, further comprising

a tube-shaped bobbin, wherein

the magnetic core is arranged in a hole of the bobbin,

the coil is wound around the bobbin, and

the adjuster relatively moves the bobbin and the magnetic core along the longitudinal direction of the coil.

15. A wireless power transmitting system comprising a power transmitting device and a power receiving device, wherein

the power transmitting device includes:

a first resonator including a magnetic core and a coil wound around the magnetic core;

a power supply to supply AC (Alternating Current) power to the first resonator;

a first adjuster to relatively move the coil and the magnetic core along a longitudinal direction of the coil;

a first controller to control the first adjuster based on a value of current flowing in the first resonator to adjust relative positions of the magnetic core and the coil; and

a first communicator to communicate with the power receiving device,

the power receiving device includes;

a second resonator including a magnetic core and a coil wound around the magnetic core, the second resonator wirelessly receiving the AC power from the first resonator arranged to be opposed to the second resonator;

an adjusting circuit to supply the AC power received by the second resonator to a load;

a second adjuster to relatively move the coil and the magnetic core in the second resonator along a longitudinal direction of the coil;

a second controller to control the second adjuster based on a value of current flowing in the second resonator to the adjust relative positions of the magnetic core and the coil; and

a second communicator to communicate with the first communicator, and

the power transmitting device and the power receiving device communicate with each other, determine an order of performing adjustment of the relative positions, and perform the adjustment of the relative positions in the determined order.

16. The system according to claim 15, wherein

one of the power transmitting device and the power receiving device determines a transmission frequency, and notifies the transmission frequency to the other device, and

the power supply of the power transmitting device generates the AC power having the transmission frequency.