Wireless power transfer system and wireless power transfer method

• US 10,027,175 B2
• Filed: 09/22/2015
• Issued: 07/17/2018
• Est. Priority Date: 03/26/2013
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Uchida, Akiyoshi
• Primary Examiner(s): SKIBINSKI, THOMAS S
• Application Number:
  US14/861,091
• Publication Number:
  US 20160013666A1
• Time in Patent Office: 1,029 Days
• Field of Search: 307104, 455 411, 700292, 700295, 700286
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• 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

A wireless power transfer system including a plurality of power supply coils, and wirelessly performing power transfer from the power supply coils to a power receiver, includes an entire controller. The entire controller is configured to control the power transfer performed by wirelessly transmitting and receiving powers of the power supply coils and the power receiver, in accordance with confirming power transfer ranges of the plurality of power supply coils.

Claims

1. A wireless power transfer system including a plurality of power supply coils, and wirelessly performing power transfer from the power supply coils to a power receiver, comprising:

an entire controller configured to control the power transfer performed by wirelessly transmitting and receiving powers of the power supply coils and the power receiver, in accordance with confirming power transfer ranges of the plurality of power supply coils, wherein

the entire controller is configured to determine a power transfer group by stopping a transmission output of at least one power supply coil in the plurality of power supply coils, and

the entire controller is configured to select the at least one power supply coil for stopping the transmission output, so as to control the number of the power supply coils included in the power transfer group without exceeding a first threshold value.

2. The wireless power transfer system as claimed in claim 1, wherein

the entire controller is configured to determine the power transfer group by considering a priority of the power receiver.

3. The wireless power transfer system as claimed in claim 1, wherein

the entire controller is configured to determine at least two power transfer groups, and sequentially switch the at least two power transfer groups.

4. The wireless power transfer system as claimed in claim 1, wherein

the wireless power transfer system includes a plurality of power sources;

and

each of the power sources includes at least one power supply coil of the plurality of power supply coils.

5. The wireless power transfer system as claimed in claim 4, wherein

the entire controller is provided separately from the power sources and the power receivers.

6. The wireless power transfer system as claimed in claim 5, wherein

the entire controller is provided in a center server.

7. The wireless power transfer system as claimed in claim 6, wherein

the center server is configured to control output intensities and phases of the power supply coils by communicating with the power sources via wireless communication lines.

8. The wireless power transfer system as claimed in claim 1, wherein

the wireless power transfer system includes a plurality of power sources;

and

each of the power sources includes a power supply coil.

9. The wireless power transfer system as claimed in claim 8, wherein

the entire controller is provided in the power source.

10. The wireless power transfer system as claimed in claim 8, wherein

the entire controller is provided in the power receiver.

11. The wireless power transfer system as claimed in claim 8, wherein

the entire controller includes:

a first entire controller provided in a center server; and

a second entire controller provided in the power source or the power receiver, wherein

the first entire controller and the second entire controller are connected via a wireless communication line.

12. The wireless power transfer system as claimed in claim 1, wherein

the power transfer from the power supply coils to the power receiver is a wireless power transfer by using magnetic field resonance or electric field resonance.

13. A wireless power transfer system including a plurality of power supply coils, and wirelessly performing power transfer from the power supply coils to a power receiver, comprising:

an entire controller configured to control the power transfer performed by wirelessly transmitting and receiving powers of the power supply coils and the power receiver, in accordance with confirming power transfer ranges of the plurality of power supply coils, wherein

the entire controller is configured to determine a power transfer group by stopping a transmission output of at least one power supply coil in the plurality of power supply coils, and

the entire controller is configured to select the at least one power supply coil for stopping the transmission output, so as to control the number of the power receivers included in the power transfer group without exceeding a second threshold value.

14. A wireless power transfer system including a plurality of power supply coils, and wirelessly performing power transfer from the power supply coils to a power receiver, comprising:

an entire controller configured to control the power transfer performed by wirelessly transmitting and receiving powers of the power supply coils and the power receiver, in accordance with confirming power transfer ranges of the plurality of power supply coils, wherein

the entire controller is configured to determine a power transfer group by stopping a transmission output of at least one power supply coil in the plurality of power supply coils, and

the entire controller is configured to select the at least one power supply coil for stopping the transmission output, so as to control a total number of the power supply coils and the power receivers included in the power transfer group without exceeding a third threshold value.

15. A wireless power transfer method for wirelessly performing power transfer from a plurality of power supply coils to a power receiver, comprising:

confirming power transfer ranges of the plurality of power supply coils;

controlling the power transfer performed by wirelessly transmitting and receiving powers of the power supply coils and the power receiver, in accordance with the confirmed power transfer ranges of the plurality of power supply coils;

determining a power transfer group by stopping a transmission output of at least one power supply coil in the plurality of power supply coils; and

selecting the at least one power supply coil for stopping the transmission output, so as to control the number of the power supply coils included in the power transfer group without exceeding a first threshold value.

16. The wireless power transfer method as claimed in claim 15, wherein the wireless power transfer method further comprises:

determining at least two power transfer groups; and

sequentially switching the at least two power transfer groups.

17. A non-transitory computer-readable storage medium storing a wireless power transfer program for wirelessly performing power transfer from a plurality of power supply coils to a power receiver, wherein the wireless power transfer program causes a computer to execute:

confirming power transfer ranges of the plurality of power supply coils;

controlling the power transfer performed by wirelessly transmitting and receiving powers of the power supply coils and the power receiver, in accordance with the confirmed power transfer ranges of the plurality of power supply coils;

determining a power transfer group by stopping a transmission output of at least one power supply coil in the plurality of power supply coils; and

selecting the at least one power supply coil for stopping the transmission output, so as to control the number of the power supply coils included in the power transfer group without exceeding a first threshold value.