US 12,170,449 B2
Wireless power receiving device and method of obtaining quality factor of wireless power transmitting device
Hyoungseok Kim, Seoul (KR); Jaeyeol Kim, Seoul (KR); Seonghun Lee, Seoul (KR); Gyunghwan Yook, Seoul (KR); and Hongkwon Kim, Seoul (KR)
Assigned to LG Electronics Inc., Seoul (KR)
Appl. No. 18/024,711
Filed by LG Electronics Inc., Seoul (KR)
PCT Filed Sep. 6, 2021, PCT No. PCT/KR2021/012050
§ 371(c)(1), (2) Date Mar. 3, 2023,
PCT Pub. No. WO2022/050796, PCT Pub. Date Mar. 10, 2022.
Claims priority of application No. 10-2020-0112735 (KR), filed on Sep. 4, 2020.
Prior Publication US 2023/0344281 A1, Oct. 26, 2023
Int. Cl. H02J 50/80 (2016.01); H02J 50/12 (2016.01); H02J 50/40 (2016.01); H02J 50/60 (2016.01)
CPC H02J 50/80 (2016.02) [H02J 50/12 (2016.02); H02J 50/402 (2020.01); H02J 50/60 (2016.02)] 14 Claims
OG exemplary drawing
 
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.