WIRELESS POWER SUPPLY SYSTEM, POWER TRANSMISSION DEVICE, AND POWER RECEIVING DEVICE

• US 20140247052A1
• Filed: 02/27/2014
• Published: 09/04/2014
• Est. Priority Date: 03/01/2013
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Hada, Manabu
• Granted Patent: US 9,482,723 B2
• Time in Patent Office: Days
• US Class Current: 324/426
• CPC Class Codes: G01R 31/40 Testing power supplies testing photovoltaic devices H02S50/10
• CPC Class Codes: H02J 50/10 using inductive coupling
• 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 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]

Abstract

A wireless power supply system includes a power transmission device capable of transmitting power to a plurality of power receiving devices by a magnetic field resonance method. The power transmission device includes a detection unit configured to detect an amount of charge of each of the plurality of power receiving devices, a determination unit configured to determine, if the amount of charge of a certain power receiving device is not increased even when a predetermined time has elapsed since start of power transmission to the certain power receiving device, whether a cause of failure to increase the amount of charge is the power transmission device or the certain power receiving device, based on the amount of charge of any other power receiving device detected by the detection unit, and a notification unit configured to transmit a notification about the determination result by the determination unit.

Claims

1. A wireless power supply system including a power transmission device for transmitting power to a plurality of power receiving devices by a magnetic field resonance method, the power transmission device comprising:

a detection unit configured to detect an amount of charge of each of the plurality of power receiving devices;

a determination unit configured to determine, if the amount of charge of a certain power receiving device is not increased even when a predetermined time has elapsed since start of power transmission to the certain power receiving device, whether a cause of failure to increase the amount of charge is the power transmission device or the certain power receiving device, based on the amount of charge of any other power receiving device detected by the detection unit; and

a notification unit configured to transmit a notification about the determination result by the determination unit.

2. The wireless power supply system according to claim 1, the power transmission device further comprising a time counting unit,

wherein the detection unit detects the amount of charge of the certain power receiving device each time a time counted by the time counting unit reaches a predetermined time, and

wherein the determination unit determines whether the amount of charge of the certain power receiving device is not increased by comparing the amount of charge detected by the detection unit this time with the amount of charge detected by the detection unit last time.

3. The wireless power supply system according to claim 1, the power transmission device further comprising a counting unit configured to count a number of times of transmission of a signal to the certain power receiving device,

wherein the detection unit detects the amount of charge of the certain power receiving device each time the number of times of transmission counted by the counting unit reaches a predetermined number of times, and

wherein the determination unit determines whether the amount of charge of the certain power receiving device is not increased by comparing the amount of charge detected by the detection unit for a current time with the amount of charge detected by the detection unit last time.

4. The wireless power supply system according to claim 1, wherein, if the determination unit determines that the amount of charge of the certain power receiving device is not increased, the determination unit determines that the certain power receiving device is the cause of failure to increase the amount of charge if the determination unit determines that the amount of charge of the other power receiving device is increased, and determines that the power transmission device is the cause of failure to increase the amount of charge if the determination unit determines that the amount of charge of the other power receiving device is not increased either.

5. A power transmission device for transmitting power to a plurality of power receiving devices by a magnetic field resonance method, the power transmission device comprising:

a detection unit configured to detect an amount of charge of each of the plurality of power receiving devices;

a determination unit configured to determine, if the amount of charge of a certain power receiving device is not increased even when a predetermined time has elapsed since start of power transmission to the certain power receiving device, whether a cause of failure to increase the amount of charge is the power transmission device or the certain power receiving device, based on the amount of charge of any other power receiving device detected by the detection unit; and

a notification unit configured to notify the certain power receiving device of the determination result by the determination unit.

6. A power receiving device for receiving power from a power transmission device by a magnetic field resonance method, the power receiving device comprising:

a transmission unit configured to wirelessly transmit information about an amount of charge to the power transmission device;

a reception unit configured to receive, if the amount of charge is not increased, from the power transmission device a determination result about whether a cause of failure to increase the amount of charge is the power transmission device or the power receiving device; and

a notification unit configured to notify a user of the determination result received by the reception unit.