POWER SUPPLY SYSTEM, POWER TRANSMITTER, AND POWER RECEIVER

• US 20130026851A1
• Filed: 10/10/2012
• Published: 01/31/2013
• Est. Priority Date: 04/13/2010
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Taguchi, Masakazu
• Granted Patent: US 9,276,439 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 13/00024 by means of mobile telephony
• CPC Class Codes: H02J 13/00026 involving a local wireless network, e.g. Wi-Fi, ZigBee or Bluetooth
• CPC Class Codes: H02J 13/00034 the elements or equipment being or involving an electric power substation
• 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
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 40/126 using wireless data transmission

Abstract

A power supply system includes one or more power transmitters and one or more power receivers: the one or more transmitters transmitting identification information and a power transmitting condition to the one or more receivers, receiving identification information and a power receiving condition from the one or more receivers, wirelessly transmitting power to the one or more receivers on the basis of the power transmitting and receiving conditions, and generating power transmission amount information indicating the amount of the transmitted power; the one or more receivers receiving identification information and a power transmitting condition from the one or more transmitters, transmitting identification information and a power receiving condition to the one or more transmitters, wirelessly receiving power from the one or more transmitters on the basis of the power transmitting and receiving conditions, generating power reception amount information, and transmitting the identification information and the power reception amount information.

Claims

1. A power supply system comprising:

at least one power transmitter that transmits first identification information and a power transmitting condition to a power receiver, receives second identification information and a power receiving condition from the power receiver, wirelessly transmits power to the power receiver on the basis of the power transmitting condition and the power receiving condition, and generates power transmission amount information indicating a power amount wirelessly transmitted to the power receiver;

at least one power receiver that receives the first identification information and the power transmitting condition from a corresponding power transmitter, transmits the second identification information and the power receiving condition to the corresponding power transmitter, wirelessly receives power from the corresponding power transmitter on the basis of the power transmitting condition and the power receiving condition, generates power reception amount information indicating a power amount wirelessly received, and transmits the first identification information, the second identification information, and the power reception amount information via a network; and

an information processing device that manages the power transmission amount information and the power reception amount information by a wireless power feed of a contractor, the information processing device receiving the first identification information, the second identification information, and the power transmission amount information via a network, and receiving the second identification information and the power reception amount information via a network.

2. The power supply system according to claim 1, wherein:

the at least one power transmitter temporarily transmits power sequentially and wirelessly to the at least one power receiver with different resonant frequencies when the power transmitting condition and the power receiving condition of the at least one power receiver fit together;

the at least one power transmitter receives information indicating a power reception state which includes a received power in the different resonant frequencies from the at least one power receiver, generates a transmitted power in the different resonant frequencies in the at least one power transmitter, determines power transmission efficiency in the different resonant frequencies on the basis of the transmitted power and the received power in the different resonant frequencies, determines one resonant frequency of the different resonant frequencies on the basis of the power transmission efficiency, transmits information indicating the determined one resonant frequency to the at least one power receiver, wirelessly transmits power to the at least one power receiver with the determined one resonant frequency; and

the at least one power receiver receives information indicating the determined one resonant frequency, and receives power with the determined one resonant frequency from the at least one power transmitter.

3. The power supply system according to claim 1, wherein:

the at least one power receiver is a plurality of power receivers;

the at least one power transmitter temporarily transmits power sequentially and wirelessly to the plurality of the power receivers which simultaneously receive power with different resonant frequencies when the power transmitting condition and the respective power receiving conditions of the plurality of the power receivers fit together;

the at least one power transmitter receives information indicating the power receiving condition which includes the received power in the different resonant frequencies from the plurality of the power receivers in the temporary power transmission, generates the transmitted power in the different resonant frequencies in the at least one power transmitter, determines the power transmission efficiency in the different resonant frequencies on the basis of the transmitted power and the received power in the different resonant frequencies, determines one resonant frequency of the different resonant frequencies on the basis of the power transmission efficiency, transmits information indicating the determined one resonant frequency to the plurality of the power receivers, transmits power to the plurality of the power receivers with the determined one resonant frequency; and

the plurality of the power receivers receives information indicating the determined one resonant frequency, and simultaneously receives power with the determined one resonant frequency from the at least one power transmitter.

4. The power supply system according to claim 1, wherein:

the at least one power receiver is a plurality of power receivers;

the at least one power transmitter temporarily transmits power with different resonant frequencies sequentially and wirelessly to the plurality of the receivers which simultaneously receive power when the power transmitting condition and the respective power receiving conditions of the plurality of the power receivers fit together;

the at least one power transmitter receives information indicating a power reception state which includes a received power in the different resonant frequencies from the plurality of power receivers in the temporary power transmission, generates a transmitted power in the different resonant frequencies in the at least one power transmitter, determines a set of power transmission efficiencies in the different resonant frequencies on the basis of the transmitted power and the received power in the different resonant frequencies, and completes the power reception by some of the plurality of power receivers with a low priority when the set of power transmission efficiencies is not greater than a threshold value, temporarily transmits power again with different resonant frequencies sequentially and wirelessly to the other power receiver of the plurality of power receivers which simultaneously receive power, determines one resonant frequency of the different resonant frequencies by which a power transmission efficiency higher than the threshold value is obtained, determines one resonant frequency of the different resonant frequencies on the basis of the high power transmission efficiency, transmits information indicating the determined one resonant frequency to the other power receiver, transmits power to the other power receiver with the determined one resonant frequency; and

the other power receiver receives information indicating the determined one resonant frequency, and simultaneously receives power with the determined one resonant frequency from the at least one power transmitter.

5. The power supply system according to claim 1, wherein the information processing device, on the basis of both the power transmission amount information and the power reception amount information, calculates a fee with respect to a value of a ratio covered by a contractor between a power amount of the power transmission amount information and a power amount of the power reception amount information as a fee with respect to the power reception amount information of the second identification information.

6. The power supply system according to claim 1, wherein:

the at least one power transmitter is a plurality of power transmitters;

the plurality of power transmitters wirelessly and temporarily transmits power to the at least one power receiver when the power transmitting condition of the plurality of power transmitters and the power receiving condition of the at least one power receiver fit together;

the at least one power receiver receives information indicating the power transmitting condition which includes the transmitted power from the plurality of the power transmitters in the temporary power transmission, generates the received power in the at least one power receiver, determines the power reception efficiency on the basis of the transmitted power and the received power, transmits information indicating a continuation or start of the power reception to the plurality of the power transmitters when the power reception efficiency is higher than a threshold value, and simultaneously receives power from the plurality of power receivers.

7. The power supply system according to claim 6, wherein the information processing device, on the basis of the power transmission amount information of the at least one power transmitter and the power reception amount information of the plurality of power receivers, calculates a fee with respect to a value of a ratio covered by each contractor between a power amount of the power transmission amount information and a power amount of the plurality of pieces of power reception amount information as each of fees with respect to each piece of the power reception amount information of the plurality of power receivers.

8. The power supply system according to claim 1, wherein the power transmitter comprises:

a transmission and reception unit that transmits the first identification information and the power transmitting condition to the first and second power receivers as the at least one power receiver, and receives the second identification information and the third identification information, the first and the second power receiving conditions as the power receiving condition, and the first and the second received power information, respectively, from the first and second power receivers;

a power transmitting unit that includes a power transmitting resonant coil and a power supplying unit supplying power of an induced current to the power transmitting resonant coil; and

a controlling unit that controls the power transmitting unit in such a way as to wirelessly transmit power to the first and the second power receivers on the basis of the power transmitting condition and the first and the second power receiving conditions when the power transmitting condition and the first and the second power receiving conditions fit together, generates the transmitted power information of the power transmitting unit and the power transmission amount information, controls power transmission to the second power receiver on the basis of the transmitted power information and the first and the second power reception amount information, and supplies the first identification information, the second identification information, the third identification information, and the power transmission amount information to the communication device.

9. The power supply system according to claim 1, wherein the power receiver comprises:

a first transmitting and receiving unit that receives the first identification information and the third identification information, the first and the second power transmitting conditions, and the first and the second received power information respectively from the first and the second power transmitters as the at least one power transmitter, and transmits the second identification information and the power receiving condition to the first and the second power transmitters;

a power receiving unit that has a power receiving resonant coil and a power fetching unit fetching power of an induced current of the power receiving resonant coil and wirelessly receives power from the first and the second power transmitters via the power receiving resonant coil;

a controlling unit that controls the power receiving unit in such a way as to wirelessly receive power from the first and the second power transmitters on the basis of the first and the second power transmitting conditions and the power receiving condition when the first and the second power transmitting conditions and the power receiving condition fit together, generates the received power information of the power receiving unit and the power reception amount information, and controls power reception from the second power transmitter on the basis of the first and the second transmitted power information and the received power information; and

a second transmitting and receiving unit that transmits the second identification information and the power reception amount information via a network.

10. The power supply system according to claim 1, further comprising at least one communication device that transmits second identification information and power transmission amount information via a network.

11. A power transmitter comprising:

a transmitting and receiving unit that transmits first identification information and a power transmitting condition to first and second power receivers, and receives second and a third identification information, first and a second power receiving conditions, and first and a second received power information respectively from the first and the second power receivers;

a power transmitting unit that includes a power transmitting resonant coil and a power supplying unit supplying power of an induced current to the power transmitting resonant coil; and

a controlling unit that controls the power transmitting unit in such a way as to wirelessly transmit power to the first and the second power receivers on the basis of the power transmitting condition and the first and the second power receiving conditions, when the power transmitting condition and the first and the second power receiving conditions fit together, generates the transmitted power information of the power transmitting unit and a power transmission amount information indicating the wirelessly transmitted power amount, controls power transmission to the second power receiver on the basis of the transmitted power information and the first and the second received power information, and supplies the first identification information, the second identification information, the third identification information, and the power transmission amount information to a communication device.

12. A power receiver comprising:

a first transmitting and receiving unit that receives first and second identification information, first and second power transmitting conditions, and first and second received power information respectively from first and second power transmitters, and transmits third identification information and a power receiving condition to the first and second power transmitters;

a power receiving unit that has a power receiving resonant coil and a power fetching unit fetching power of an induced current of the power receiving resonant coil and wirelessly receives power from the first and second power transmitters via the power receiving resonant coil;

a controlling unit that controls the power receiving unit in such a way as to wirelessly receive power from the first and second power transmitters on the basis of the first and second power transmitting conditions and the power receiving condition when the first and second power transmitting conditions and the power receiving condition fit together, generates received power information of the power receiving unit and power reception amount information indicating the wirelessly received power amount, and controls power reception from the second power transmitter on the basis of the first and second transmitted power information and the received power information; and

a second transmitting and receiving unit that transmits the third identification information and the power reception amount information via a network.