Method and apparatus for performing power calibration in wireless power transfer system
A wireless power transmitter including a power conversion unit configured to transmit wireless power generated based on magnetic coupling in a power transfer phase and a control unit configured to receive, from the wireless power receiver operating at a first operating point, a first received power packet of the first operating point and a second received power packet of the first operating point based on the first received power packet of the first operating point and the second received power packet of the first operating point and configured to receive a first received power packet of the second operating point and a second received power packet of the second operating point related to power calibration and construct a second power calibration curve based on the first received power packet of the second operating point and the second received power packet of the second operating point.
1. A wireless power transmitter comprising:
a power conversion unit configured to transmit, to a wireless power receiver, wireless power generated based on magnetic coupling in a power transfer phase; and
a communication/control unit configured to receive, from the wireless power receiver, a first received power packet and a second received power packet related to power calibration and construct a first power calibration curve based on the first received power packet and the second received power packet and configured to receive, from the wireless power receiver, a third received power packet and a fourth received power packet related to power calibration and construct a second power calibration curve based on the third received power packet and the fourth received power packet.
2. The wireless power transmitter of claim 1 , wherein
the first received power packet and the second received power packet are received from the wireless power receiver in the first operating mode and the third received power packet and the fourth received power packet are received from the wireless power receiver in the second operating mode.
3. The wireless power transmitter of claim 1 , wherein
the first received power packet and the third received power packet are power values received by the wireless power receiver when the wireless power receiver is under a light load condition, and the second received power packet and the fourth received power packet are power values received by the wireless power receiver when the wireless power receiver is under a connected-load condition.
4. The wireless power transmitter of claim 1 , wherein
a value of a mode field included in the third received power packet is the same as a value of a mode field included in the first received power packet, and a value of a mode field included in the fourth received power packet is the same as a value of a mode field included in the second received power packet.
5. The wireless power transmitter of claim 1 , wherein
a value of a mode field included in the third received power packet is the same as a value of a mode field included in the fourth received power packet.
6. The wireless power transmitter of claim 1 , wherein
the communication/control unit does not calibrate transmitted power if a calibration value of the transmitted power calculated based on the second power calibration curve is a negative value.
7. The wireless power transmitter of claim 1 , wherein
the communication/control unit performs foreign object detection (FOD) if a difference between the sum of estimated transmitted power and a calibration value of transmitted power calculated based on the second power calibration curve and estimated received power included in a received power packet received from the wireless power receiver is equal to a threshold value or exceeds the threshold value.
8. A wireless power transmitter comprising:
a power conversion unit configured to transmit, to a wireless power receiver, wireless power generated based on magnetic coupling in a power transfer phase; and
a communication/control unit configured to receive, from the wireless power receiver operating at a first operating point, a first received power packet of the first operating point and a second received power packet of the first operating point related to power calibration and construct a first power calibration curve based on the first received power packet of the first operating point and the second received power packet of the first operating point and configured to receive, from the wireless power receiver operating at a second operating point, a first received power packet of the second operating point and a second received power packet of the second operating point related to power calibration and construct a second power calibration curve based on the first received power packet of the second operating point and the second received power packet of the second operating point.