US 12,395,013 B2
Power transmission apparatus, power reception apparatus, method, and storage medium
Takahiro Shichino, Tokyo (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Mar. 15, 2024, as Appl. No. 18/606,325.
Application 18/606,325 is a continuation of application No. PCT/JP2022/033053, filed on Sep. 2, 2022.
Claims priority of application No. 2021-152002 (JP), filed on Sep. 17, 2021.
Prior Publication US 2024/0223015 A1, Jul. 4, 2024
Int. Cl. H02J 50/12 (2016.01); B60L 53/124 (2019.01); H02J 7/00 (2006.01); H02J 50/60 (2016.01); H02J 50/80 (2016.01)
CPC H02J 50/12 (2016.02) [H02J 7/0048 (2020.01); H02J 7/0063 (2013.01); H02J 50/60 (2016.02); H02J 50/80 (2016.02); B60L 53/124 (2019.02)] 20 Claims
OG exemplary drawing
 
1. A power transmission apparatus, comprising:
a reception unit configured to receive a request to calculate a quality factor (Q factor) and a received power value from a power reception apparatus;
a stop unit configured to stop a voltage applied to a power transmission coil;
a calculation unit configured to calculate the Q factor based on a change in an electrical characteristic of the power transmission coil over time during a stop; and
a transmission unit configured to, if the change in the electrical characteristic of the power transmission coil over time during the stop is monotonically decreasing, transmit, to the power reception apparatus, a notification indicating whether to use the received power value to detect a foreign object based on the calculated Q factor, and if the change in the electrical characteristic of the power transmission coil over time during the stop is not monotonically decreasing, transmit, to the power reception apparatus, a notification indicating that whether to use the received power value to detect the foreign object is not determined.