Wireless power transmission system and method for detecting RFID/NFC card
Disclosed in the present application is a wireless power receiver comprising: a power pickup unit configured to receive, in a power transfer phase, wireless power generated by magnetic coupling from a wireless power transmitter; and a communications/control unit configured to transfer, in a negotiation phase, a first end-of-power-transfer (EPT) packet to the wireless power transmitter for detecting an RFID/NFC card, and to detect the RFID/NFC card during a re-ping time secured on the basis of the first EPT packet, wherein the first EPT packet instructs requesting the removal of a power signal for a predetermined time. As the process for detecting communication cards, such as RFID or NFC, between the wireless power transmitter and receiver is clearly defined, such RFID/NFC cards can be protected against getting destroyed by the wireless power, and a stable wireless power transfer can be achieved.
1. A wireless power receiver comprising:
a power pickup unit configured to receive a wireless power generated based on magnetic coupling from a wireless power transmitter in a power transfer phase; and
a communication/control unit configured to transmit a first end power transfer (EPT) packet to the wireless power transmitter for detecting an external communication card and perform a detection of the external communication card during a re-ping time secured based on the first EPT packet in a negotiation phase,
wherein the first EPT packet is used for a request of removing a power signal during a predetermined time.
2. The wireless power receiver of claim 1 , wherein the communication/control unit is configured to:
transmit a request packet to request information related to the external communication card to the wireless power transmitter in the negotiation phase, and
receive external communication card detection ability information for that the wireless power transmitter does not have the ability of external communication card detection from the wireless power transmitter.
3. The wireless power receiver of claim 2 , wherein the request packet is a general request packet or a specific request packet.
4. The wireless power receiver of claim 2 , wherein the external communication card detection ability information is included in a foreign object detection (FOD) packet, and
wherein the FOD packet includes at least one of a first field of 1 bit for that whether the wireless power transmitter is provided with the ability of external communication card detection or a second field of 1 bit for that whether the wireless power transmitter detects the external communication card.
5. The wireless power receiver of claim 2 , wherein the external communication card detection ability information is included in a capability packet, and
wherein the capability packet includes at least one of a first field of 1 bit for that whether the wireless power transmitter is provided with the ability of external communication card detection or a second field of 1 bit for that whether the wireless power transmitter detects the external communication card.
6. The wireless power receiver of claim 1 , based on that the external communication card is detected,
wherein the communication/control unit transmits a second EPT packet using for a stop of the power transfer owing to the detection of the external communication card to the wireless power transmitter.
7. The wireless power receiver of claim 1 , wherein the external communication card is an RFID or NFC.
8. A wireless power transmitter comprising:
a power conversion unit configured to transmit a wireless power generated based on magnetic coupling to a wireless power receiver in a power transfer phase; and
a communication/control unit configured to receive a first end power transfer (EPT) packet for allowing the wireless power receiver to detect an external communication card from the wireless power receiver and minimize or stop the magnetic coupling to detect the external communication card during a re-ping time secured based on the first EPT packet in a negotiation phase,
wherein the first EPT packet is used for a request of removing a power signal during a predetermined time.
9. The wireless power transmitter of claim 8 , wherein the communication/control unit is configured to:
receive a request packet to request information related to the external communication card from the wireless power receiver in the negotiation phase, and
transmit external communication card detection ability information for that the wireless power transmitter does not have the ability of external communication card detection to the wireless power receiver in response to the request packet.
10. The wireless power transmitter of claim 9 , wherein the request packet is a general request packet or a specific request packet.
11. The wireless power transmitter of claim 9 , wherein the external communication card detection ability information is included in a foreign object detection (FOD) packet, and
wherein the FOD packet includes at least one of a first field of 1 bit for that whether the wireless power transmitter is provided with the ability of external communication card detection or a second field of 1 bit for that whether the wireless power transmitter detects the external communication card.
12. The wireless power transmitter of claim 9 , wherein the external communication card detection ability information is included in a capability packet, and
wherein the capability packet includes at least one of a first field of 1 bit for that whether the wireless power transmitter is provided with the ability of external communication card detection or a second field of 1 bit for that whether the wireless power transmitter detects the external communication card.
13. The wireless power transmitter of claim 8 , based on that the external communication card is detected,
wherein the communication/control unit receives a second EPT packet using for a stop of the power transfer owing to the detection of the external communication card from the wireless power receiver.
14. The wireless power transmitter of claim 8 , wherein the external communication card is an RFID or NFC.