POWER TRANSMISSION APPARATUS FOR WIRELESSLY SUPPLYING POWER TO POWER RECEPTION APPARATUS

• US 20170118713A1
• Filed: 10/19/2016
• Published: 04/27/2017
• Est. Priority Date: 10/23/2015
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Tsukamoto, Nobuyuki
• Granted Patent: US 10,375,639 B2
• Time in Patent Office: Days
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 4/80 Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
• CPC Class Codes: H04W 52/0235 where the received signal is a power saving command
• CPC Class Codes: H04W 52/0261 managing power supply demand, e.g. depending on battery level

Abstract

A power transmission apparatus includes a communication unit that executes communication with an electronic apparatus, a power transmission unit that wirelessly supplies power to the electronic apparatus, and a control unit that controls communication and power supply to be executed alternately, wherein the control unit adjusts communication power of the communication unit and transmission power of the power transmission unit and/or a length of a communication period and a length of a power transmission period, so that an average magnetic field intensity does not exceed a first magnetic field intensity in a predetermined region throughout the communication period of communication executed by the communication unit and the power transmission period of power transmission executed by the power transmission unit.

Claims

1. A power transmission apparatus comprising:

a communication unit configured to execute communication with an electronic apparatus;

a power transmission unit configured to wirelessly supply power to the electronic apparatus; and

a control unit configured to control communication executed by the communication unit and power supply executed by the power transmission unit to be executed alternately,

wherein the control unit adjusts communication power of the communication unit and transmission power of the power transmission unit and/or a length of a communication period and a length of a power transmission period so that an average magnetic field intensity does not exceed a first magnetic field intensity in a predetermined region throughout the communication period of communication executed by the communication unit and the power transmission period of power transmission executed by the power transmission unit.

2. The power transmission apparatus according to claim 1, wherein the control unit adjusts the communication power of the communication unit and the transmission power of the power transmission unit and/or the length of the communication period and the length of the power transmission period so that a maximum magnetic field intensity does not exceed a second magnetic field intensity in the predetermined region throughout the communication period of communication executed by the communication unit and the power transmission period of power transmission executed by the power transmission unit.

3. The power transmission apparatus according to claim 2, wherein the control unit reduces the first magnetic field intensity or the second magnetic field intensity according to a lapse of time from a start of the power transmission executed by the power transmission unit.

4. The power transmission apparatus according to claim 2, further comprising a temperature detection unit configured to detect a temperature of the power transmission apparatus,

wherein the control unit reduces the first magnetic field intensity or the second magnetic field intensity according to an increase of the temperature detected by the temperature detection unit.

5. The power transmission apparatus according to claim 2, wherein the first magnetic field intensity is set to 10 A/m and the second magnetic field intensity is set to 12 A/m.

6. The power transmission apparatus according to claim 1, wherein the predetermined region is a region where the communication unit can communicate with the electronic apparatus.

7. The power transmission apparatus according to claim 1 further comprising an antenna,

wherein the communication unit wirelessly communicates with the electronic apparatus via the antenna, and

wherein the power transmission unit wirelessly supplies power to the electronic apparatus via the antenna.

8. The power transmission apparatus according to claim 1, wherein the communication unit executes communication based on a specification specified by a near field communication standard.

9. The power transmission apparatus according to claim 1, wherein the communication unit operates as a reader/writer.

10. A control method for a power transmission apparatus including a communication unit for executing communication with an electronic apparatus and a power transmission unit for wirelessly supplying power to the electronic apparatus, the control method comprising:

controlling communication executed by the communication unit and power supply executed by the power transmission unit to be executed alternately; and

adjusting communication power of the communication unit and transmission power of the power transmission unit and/or a length of a communication period and a length of a power transmission period so that average magnetic field intensity does not exceed a first magnetic field intensity in a predetermined region throughout the communication period of communication executed by the communication unit and the power transmission period of power transmission executed by the power transmission unit.

11. The control method according to claim 10, further comprising adjusting the communication power of the communication unit and the transmission power of the power transmission unit and/or the length of the communication period and the length of the power transmission period so that a maximum magnetic field intensity does not exceed a second magnetic field intensity in the predetermined region throughout the communication period of communication executed by the communication unit and the power transmission period of power transmission executed by the power transmission unit.

12. The control method according to claim 11, further comprising reducing the first magnetic field intensity or the second magnetic field intensity according to a lapse of time from a start of the power transmission executed by the power transmission unit.

13. The control method according to claim 11, further comprising detecting a temperature of the power transmission apparatus,

wherein the first magnetic field intensity or the second magnetic field intensity is reduced according to detection of an increase of the temperature.

14. The control method according to claim 11, wherein the first magnetic field intensity is set to 10 A/m and the second magnetic field intensity is set to 12 A/m.

15. The control method according to claim 10, wherein the predetermined region is a region where the communication unit can communicate with the electronic apparatus.

16. The control method according to claim 10, wherein communication executed by the communication unit is based on a specification specified by a near field communication standard.

17. A non-transitory computer-readable storage medium storing computer executable instructions for causing a power transmission apparatus including a communication unit configured to communicate with an electronic apparatus and a power transmission unit configured to wirelessly supply power to the electronic apparatus to execute a control method, the control method comprising:

controlling communication executed by the communication unit and power supply executed by the power transmission unit to be executed alternately; and

adjusting communication power of the communication unit and transmission power of the power transmission unit and/or a length of a communication period and a length of a power transmission period so that average magnetic field intensity does not exceed a first magnetic field intensity in a predetermined region throughout the communication period of communication executed by the communication unit and the power transmission period of power transmission executed by the power transmission unit.