US 12,255,469 B2
Power transmitting apparatus with ability to appropriately limit power transmission, control method for power transmitting apparatus, and storage medium thereof
Ryosuke Sato, Tokyo (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on May 24, 2021, as Appl. No. 17/328,944.
Application 17/328,944 is a continuation of application No. PCT/JP2019/044799, filed on Nov. 15, 2019.
Claims priority of application No. 2018-222508 (JP), filed on Nov. 28, 2018.
Prior Publication US 2021/0281125 A1, Sep. 9, 2021
Int. Cl. H02J 50/80 (2016.01); H02J 7/02 (2016.01); H02J 50/12 (2016.01); H04B 5/48 (2024.01); H02J 50/20 (2016.01); H02J 50/30 (2016.01)
CPC H02J 50/80 (2016.02) [H02J 7/02 (2013.01); H02J 50/12 (2016.02); H04B 5/48 (2024.01); H02J 50/20 (2016.02); H02J 50/30 (2016.02)] 12 Claims
OG exemplary drawing
 
1. A power transmitting apparatus comprising:
a power transmitting unit configured to perform wireless power transmission to a power receiving apparatus;
a first communication unit configured to receive, from the power receiving apparatus, a first packet to request capability of the power transmitting apparatus and a second packet including information on requested power by the power receiving apparatus and configured to negotiate power to be transmitted with the power receiving apparatus; and
a second communication unit configured to perform polling using an NFC communication method, configured to receive, using the NFC communication method, a response to the polling, and configured to perform detection processing for detecting, based on the received response to the polling, an NFC tag which is different from the power receiving apparatus;
wherein
in a Negotiation Phase, in a case where the NFC tag is detected, the first communication unit negotiates, as the power to be transmitted, power limited to avoid damaging the NFC tag and in the case where the NFC tag is not detected, the first communication unit negotiates, as the power to be transmitted, power based on a maximum transmittable power that is higher than the limited power in the case where the NFC tag is detected,
in a Power Transfer Phase, the power transmitting unit performs the wireless power transmission to the power receiving apparatus based on the negotiated power that is not zero, regardless of the negotiated power being the limited power in the case where the NFC tag is detected,
in the Negotiation Phase, the first communication unit transmits, to the power receiving apparatus, a response packet for the received first packet, the response packet including first information indicating that the power is limited in the case where the NFC tag is detected, and the response packet including second information indicating the power that is based on the maximum transmittable power in the case where the NFC tag is not detected, and
in the Negotiation Phase, the first communication unit transmits, to the power receiving apparatus, for the received second packet, a Negative Acknowledgement packet in a case where the requested power is larger than a threshold set to avoid damaging the NFC tag and transmits an Acknowledgement packet in a case where the requested power is not larger than the threshold.