IP Library › Granted Patent US 12689240
Granted Patent B2
US 12689240 · App. 18/927,635 · Granted Jul 21, 2026

Power transmission apparatus, power reception apparatus, method for controlling wireless power transmission system, and storage medium

Inventor: Hajime Shimura (Kanagawa, JP)
Assignee: CANON KABUSHIKI KAISHA
H02J50/60H02J7/02H02J7/90H02J50/12H02J50/80H02J50/90
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Quick Facts
Patent No.
US 12689240
App. No.
18/927,635
Granted
Jul 21, 2026
Kind
B2
Abstract

A wireless power transmission system wirelessly transmits power from a power transmission apparatus to a power reception apparatus. The system performs detection processing using a first detection method for detecting an object different from the power reception apparatus. The system determines whether a predetermined condition related to a state of at least either one of the power transmission apparatus and the power reception apparatus is satisfied. Then, the system performs object detection processing using a second detection method, different from the first detection method, according to a result of the determination regarding whether the predetermined condition is satisfied.

Claims (15)

1 . A power transmission apparatus comprising:

a power transmission unit configured to wirelessly transmit power to a power reception apparatus;

an obtaining unit configured to obtain information relating to a temperature;

detection unit configured to perform a first foreign object detection process relating to a Quality Factor and a second foreign object detection process relating to power loss,

wherein, after the information relating to the temperature is obtained, the detection unit performs the first foreign object detection process during a period in which power transmission is restricted, and

the detection unit performs calibration relating to the second foreign object detection process, in a case where no foreign object is detected by the first foreign object detection process.

2 . The power transmission apparatus according to claim 1 , wherein the power transmission unit limits power transmission in a case where the predetermined condition is not satisfied.

3 . The power transmission apparatus according to claim 1 , wherein the predetermined condition is that the second quality factor is smaller than the first quality factor.

4 . The power transmission apparatus according to claim 1 , wherein the determination unit determines that there is no foreign object in a case where the predetermined condition is satisfied.

5 . A method to be executed by a transmission apparatus, the method comprising:

transmitting power to a power reception apparatus;

obtaining information relating to a temperature;

performing a first foreign object detection process relating to a Quality Factor and a second foreign object detection process relating to power loss,

wherein, after the information relating to the temperature is obtained, the first foreign object detection process is performed during a period in which power transmission is restricted, and

performing calibration relating to the second foreign object detection process, in a case where no foreign object is detected by the first foreign object detection process.