Power transmitting apparatus with ability to appropriately limit power transmission, control method for power transmitting apparatus, and storage medium thereof
In a case where a power receiving apparatus detected by communication with a first communication unit, and an apparatus performing communication based on a standard of Near Field Communication (NFC) that has been detected by communication with a second communication unit 106 are the same apparatuses, a control unit controls a power transmitting unit to perform power transmission with higher power than power used in a case where the power receiving apparatus and the apparatus are not the same apparatuses.
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.
2. The power transmitting apparatus according to claim 1 , wherein, in the case where the NFC tag is not detected by the second communication unit, the power transmitting unit performs wireless power transmission based on the requested power.
3. The power transmitting apparatus according to claim 1 , wherein
in a case where the power receiving apparatus is operating in a card emulation mode, the first communication unit receives the first information identified as an object communicating using the NFC communication method, from the power receiving apparatus,
the second communication unit receives the second information identified as an object communicating using the NFC communication method, from an apparatus communicating using the NFC communication method, and
in a case where the first information received by the first communication unit is not same as the second information received by the second communication unit, the second communication unit determines that the NFC tag exists.
4. The power transmitting apparatus according to claim 3 ,
wherein
the first communication unit receives an Extended Identification Packet defined in a standard of Wireless Power Consortium, and
the first information is included in the Extended Identification Packet.
5. The power transmitting apparatus according to claim 1 , wherein, in a case where more than one NFC tag responds to the polling, the first communication unit limits the power.
6. The power transmitting apparatus according to claim 1 , wherein, in the case where the NFC tag is not detected, a value of the power is a first value, and
wherein, in the case where the NFC tag is detected, a value of the power is a second value lower than the first value.
7. The power transmitting apparatus according to claim 1 , wherein the response packet is a packet of Power Transmitter Capability defined in a standard of Wireless Power Consortium.
8. The power transmitting apparatus according to claim 1 , wherein the first packet is a packet of General Request defined in a standard of Wireless Power Consortium.
9. The power transmitting apparatus according to claim 1 ,
wherein, in the case where the NFC tag is detected and the first communication unit receives a specific signal from the power receiving apparatus, the power is not limited.
10. The power transmitting apparatus according to claim 9 , wherein the specific signal is a packet of Extended Identification defined in a standard of Wireless Power Consortium.
11. A method for a power transmitting apparatus, the method comprising:
performing polling using an NFC communication method;
receiving, using the NFC communication method, a response to the polling;
performing, based on the received response to the polling, detection processing for an NFC tag which is different from a power receiving apparatus and communicates using the NFC communication method;
performing negotiation with the power receiving apparatus so that power is limited to avoid damaging the NFC tag in a case where the NFC tag is detected;
performing, in a case where the NFC tag is not detected, negotiation about the power based on a maximum transmittable power that is higher than the power limited in the case where the NFC tag is detected;
performing, in a Power Transfer phase, the wireless power transmission to the power receiving apparatus based on the negotiated power that is not zero, regardless of the NFC tag is detected;
receiving, from the power receiving apparatus, a first packet to request capability of the power transmitting apparatus;
transmitting, to the power receiving apparatus, a response packet for the received first packet, the response packet including first information representing that the power is limited in the case where the NFC tag is detected, and the response packet including second information on the power that is based on the maximum transmittable power;
receiving, from the power receiving apparatus, a second packet including information on requested power which the power receiving apparatus requests; and
transmitting 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 transmitting an Acknowledgement packet in a case where the requested power is not larger than the threshold.
12. A non-transitory computer-readable storage medium storing a program for causing a computer to execute a method for a power transmitting apparatus, the method comprising:
performing polling using an NFC communication method;
receiving, using the NFC communication method, a response to the polling;
performing, based on the received response to the polling, detection processing for an NFC tag which is different from a power receiving apparatus and communicates using the NFC communication method;
performing negotiation with the power receiving apparatus so that power is limited to avoid damaging the NFC tag in a case where the NFC tag is detected;
performing, in a case where the NFC tag is not detected, negotiation about the power based on a maximum transmittable power that is higher than the power limited in the case where the NFC tag is detected;
performing, in a Power Transfer phase, the wireless power transmission to the power receiving apparatus based on the negotiated power that is not zero, regardless of the NFC tag is detected;
receiving, from the power receiving apparatus, a first packet to request capability of the power transmitting apparatus;
transmitting, to the power receiving apparatus, a response packet for the received first packet, the response packet which includes information representing that the power is limited in the case where the NFC tag is detected, and which includes information on the power based on the maximum transmittable power;
receiving, from the power receiving apparatus, a second packet including information on requested power which the power receiving apparatus requests; and
transmitting 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 transmitting an Acknowledgement packet in a case where the requested power is not larger than the threshold.