POWER TRANSMISSION DEVICE, POWER RECEPTION DEVICE, AND POWER TRANSMISSION SYSTEM

• US 20170005528A1
• Filed: 09/19/2016
• Published: 01/05/2017
• Est. Priority Date: 06/12/2014
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: OODACHI, Noriaki, OBAYASHI, Shuichi
• Granted Patent: US 10,658,876 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields

Abstract

A power transmission device according to one embodiment, includes a first power transmission resonator configured to wirelessly transmits power; a second power transmission resonator configured to wirelessly transmits power; a first power supply configured to output AC power to the first power transmission resonator; and a second power supply configured to output AC power having a frequency different from that of the first power supply to the second power transmission resonator. An operating band of the first power transmission resonator includes the frequency of the first power supply and does not include the frequency of the second power supply. An operating band of the second power transmission resonator does not include the frequency of the first power supply and includes the frequency of the second power supply.

Claims

1. A power transmission device, comprising:

a first power transmission resonator configured to wirelessly transmits power;

a second power transmission resonator configured to wirelessly transmits power;

a first power supply configured to output AC power to the first power transmission resonator; and

a second power supply configured to output AC power having a frequency different from that of the first power supply to the second power transmission resonator, wherein;

an operating band of the first power transmission resonator includes the frequency of the first power supply and does not include the frequency of the second power supply; and

an operating band of the second power transmission resonator does not include the frequency of the first power supply and includes the frequency of the second power supply.

2. The power transmission device according to claim 1, comprising three or more power transmission resonators including the first power transmission resonator and the second power transmission resonator, wherein

when resonance frequencies of the three or more power transmission resonators are ordered in frequency, the resonance frequency of the first power transmission resonator and the resonance frequency of the second power transmission resonator are adjacent to each other.

3. The power transmission device according to claim 1, wherein:

a resonance frequency of the first power transmission resonator is equal to the frequency of the first power supply;

a resonance frequency of the second power transmission resonator is equal to the frequency of the second power supply; and

a difference between the frequency of the first power supply and the frequency of the second power supply is greater than one-half an operating bandwidth of the first power transmission resonator, and is greater than one-half an operating bandwidth of the second power transmission resonator.

4. The power transmission device according to claim 3, wherein:

the operating bandwidth of the first power transmission resonator has a value obtained by dividing the resonance frequency of the first power transmission resonator by a Q value of the first power transmission resonator; and

the operating bandwidth of the second power transmission resonator has a value obtained by dividing the resonance frequency of the second power transmission resonator by a Q value of the second power transmission resonator.

5. The power transmission device according to claim 1, wherein

if a lower frequency out of the frequencies of the first power supply and the second power supply is within a frequency band to be set for interference noise measurement, a frequency difference between the first power supply and the second power supply is set to be greater than a measurement frequency bandwidth which is set in accordance with the frequency band.

6. The power transmission device according to claim 1, wherein

at least one of the first power supply and the second power supply comprises a plurality of sub-power supplies configured to output AC powers having mutually the same frequency;

and

at least one of the first power transmission resonator and the second power transmission resonator comprises a plurality of sub-power transmission resonators connected to different ones of the plurality of sub-power supplies.

7. The power transmission device according to claim 6, further comprising a phase controller configured to control phases of AC powers output by the plurality of sub-power supplies to make electromagnetic fields leaked from the plurality of sub-power transmission resonators cancel each other.

8. The power transmission device according to claim 7, wherein the phase controller controls amplitudes of the AC powers output by the plurality of sub-power supplies to make amplitudes of currents which pass through the plurality of sub-power transmission resonators get close to each other.

9. A power reception device configured to receive power from a power transmission device in a contactless manner, comprising:

a first power transmission resonator configured to wirelessly transmit power;

a second power transmission resonator configured to wirelessly transmit power;

a first power supply configured to output AC power to the first power transmission resonator; and

a second power supply configured to output AC power having a frequency different from that of the first power supply to the second power transmission resonator, in which an operating band of the first power transmission resonator includes the frequency of the first power supply and does not include the frequency of the second power supply, and an operating band of the second power transmission resonator does not include the frequency of the first power supply and includes the frequency of the second power supply, the power reception device, comprising

one or more power reception resonators configured to wirelessly receive power from the first power transmission resonator or the second power transmission resonator, wherein

an operating band of any one of the one or more power reception resonators includes the frequency of the first power supply or the frequency of the second power supply.

10. The power reception device according to claim 9, wherein a resonance frequency of any one of the one or more power reception resonators is one of the frequency of the first power supply and the frequency of the second power supply.

11. The power reception device according to claim 9, wherein a resonance frequency of any one of the one or more power reception resonators has a value in a range from a value of a minimum frequency to a value of a maximum frequency out of frequencies of a plurality of power supplies included in the power transmission device.

12. The power reception device according to claim 9, wherein

the one or more power reception resonators include a first power reception resonator and a second power reception resonator, wherein:

an operating band of the first power reception resonator includes the frequency of the first power supply and does not include the frequency of the second power supply; and

an operating band of the second power reception resonator does not include the frequency of the first power supply and includes the frequency of the second power supply.

13. The power reception device according to claim 12, wherein

the number of the one or more power reception resonators is three or more, wherein

when resonance frequencies of three or more of the power reception resonators are ordered in frequency, the resonance frequency of the first power reception resonator and the resonance frequency of the second power reception resonator are adjacent to each other.

14. The power reception device according to claim 9, wherein:

at least one of the plurality of power supplies comprises a plurality of sub-power supplies configured to output AC powers having mutually the same frequency;

at least one of the plurality of power transmission resonators comprises a plurality of sub-power transmission resonators connected to different ones of the sub-power supplies; and

at least one of the power reception resonators comprises a plurality of sub-power reception resonators configured to wirelessly receive power from the sub-power transmission resonators included in the plurality of sub-power transmission resonators.

15. A power transmission system, comprising:

a power transmission resonator configured to wirelessly transmit power;

a first power supply configured to output AC power to the power transmission resonator;

a second power supply configured to output AC power having a frequency different from a frequency of the first power supply to the power transmission resonator;

a first power reception resonator configured to wirelessly receive power from the power transmission resonator; and

a second power reception resonator configured to wirelessly receive power from the power transmission resonator, wherein;

an operating band of the first power reception resonator includes the frequency of the first power supply and does not include the frequency of the second power supply; and

an operating band of the second power reception resonator does not include the frequency of the first power supply and includes the frequency of the second power supply.

16. The power transmission system according to claim 15, comprising three or more power reception resonators including the first power reception resonator and the second power reception resonator, wherein

when resonance frequencies of the three or more power reception resonators are ordered in frequency, the resonance frequency of the first power reception resonator and the resonance frequency of the second power reception resonator are adjacent to each other.

17. The power transmission system according to claim 15, wherein:

a resonance frequency of the first power reception resonator is equal to the frequency of the first power supply;

a resonance frequency of the second power reception resonator is equal to the frequency of the second power supply; and

a difference between the frequency of the first power supply and the frequency of the second power supply is greater than one-half an operating bandwidth of the first power reception resonator, and is greater than one-half an operating bandwidth of the second power reception resonator.