Power transmission apparatus, power reception apparatus, control method performed by power transmission apparatus, control method performed by power reception apparatus, and storage medium

Inventor: Kazuo Moritomo (Kanagawa, JP)

Assignee: CANON KABUSHIKI KAISHA

H02J50/80 H02J50/10 H02J50/60

View Patent ↗

Loading inventors, assignments & file history…

Monitor This Case

Get email alerts when status or documents change.

Order Certified Copies

Most orders are placed with the USPTO same day — all within 24 business hours.

Order via The Patent Place →

Pre-filled with this patent's details

Quick Facts

Patent No.: US 12706491
App. No.: 18/977,741
Granted: Aug 11, 2026
Kind: B2

External Links

USPTO Patent Center↗ Full Patent PDF↗

Abstract

A power transmission apparatus 101 includes a communication unit 206 configured to wirelessly communicate with a power reception apparatus using an antenna, a power transmission unit 203 configured to wirelessly transfer power to the power reception apparatus using the antenna, a detection unit 204 configured to measure at least either a voltage or a current output from the antenna in a period where the transfer of the power is stopped and the communication by the communication unit 206 is not performed, and determine that there is an object different from the power reception apparatus based on the result of the measurement, and a control unit 201 configured to, if there is determined to be the object different from the power reception apparatus, restrict the transfer of the power.

Claims (24)

1 . A power transmission apparatus, comprising:

at least one processor; and

at least one memory in communication with the at least one processor, storing instructions that, when executed by the at least one processor, cause the at least one processor to:

perform negotiation with a power reception apparatus in a negotiation phase;

wirelessly transmit power to the power reception apparatus in a power transfer phase after the negotiation phase;

if predetermined information is received from the power reception apparatus in the power transfer phase, restrict transmission of the power; and

detect an object in a period in which the transmission of the power is restricted, wherein

after an end of the period in which the transmission of the power is restricted, resume the transmission of the power in the power transfer phase without going through the negotiation phase.

2 . The power transmission apparatus according to claim 1 , wherein

the object is detected on a basis of time information determined through the negotiation with the power reception apparatus.

3 . The power transmission apparatus according to claim 2 , wherein

the object is detected in accordance with a timing that is based on the time information.

4 . The power transmission apparatus according to claim 1 , wherein

the object is detected on a basis of a quality factor.

5 . The power transmission apparatus according to claim 4 , wherein the at least one processor is further configured to

measure the quality factor on a basis of a decay envelope of a waveform.

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

the predetermined information is information indicating received power.

7 . A method performed by a power transmission apparatus, the method comprising:

performing negotiation with a power reception apparatus in a negotiation phase;

wirelessly transmitting power to the power reception apparatus in a power transfer phase after the negotiation phase;

restricting, if predetermined information is received from the power reception apparatus in the power transfer phase, transmission of the power;

detecting an object in a period in which the transmission of the power is restricted; and

after an end of the period in which the transmission of the power is restricted, resuming the transmission of the power in the power transfer phase without going through the negotiation phase.