CPC H02J 50/80 (2016.02) [H02J 50/12 (2016.02); H02J 50/402 (2020.01); H02J 50/60 (2016.02)] | 14 Claims |
1. A wireless power transmitter, which transmits a wireless power to a wireless power receiver, comprising:
a power conversion circuit including a primary coil for transmitting the wireless power to the wireless power receiver; and
a communication/control circuit communicating with the wireless power receiver and controlling the power conversion circuit,
wherein the communication/control circuit is configured to:
before transmitting the wireless power to the wireless power receiver,
stop a transmission of a driving power after temporarily applying the driving power to the primary coil, and
obtain a quality factor based on a change of voltage or current of the primary coil during a time when the transmission of the driving power is stopped,
wherein the communication/control circuit is configured to:
obtain the quality factor based on a change in effective peak values obtained except for a peak value of an initial section among peak values of a current value or a voltage value of the primary coil generated within the time when the transmission of the driving power is stopped.
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