公开(公告)号：US20210066973A1

公开(公告)日：2021-03-04

申请号：US16961554

申请日：2019-01-08

Applicant: LG ELECTRONICS INC.

Inventor： Yongcheol PARK ,  Joonho PARK ,  Gyunghwan YOOK

IPC: H02J50/80 ,  H02J50/12 ,  H02J50/40

Abstract: The present invention relates to an apparatus and a method for performing power calibration in a wireless power transmission system. The present specification provides a wireless power transmission apparatus comprising: a power conversion unit configured to transmit, in a power transfer phase, wireless power generated on the basis of magnetic coupling to a wireless power receiving device; and a communication/control unit configured to perform an initial calibration for a power parameter prior to the power transfer phase, receive a first received power packet from the wireless power receiving device indicating the power received by the wireless power receiving device during the power transfer phase, and detect foreign matter by using the received power and a first power loss determined on the basis of the initial calibration. It is possible to adaptively respond to a newly changed wireless charging environment to calibrate transmission power and reception power, and it is possible to detect foreign matter more precisely by detecting a power loss on the basis of the calibrated transmission and reception power.

公开(公告)号：US20190326786A1

公开(公告)日：2019-10-24

申请号：US16375823

申请日：2019-04-04

Applicant: LG ELECTRONICS INC.

Inventor： Kyunghwan KIM ,  Yongcheol PARK ,  Jihyun LEE ,  Gyunghwan YOOK

IPC: H02J50/60 ,  H02J50/80 ,  H02J50/12 ,  H04B5/00

Abstract: Provided are an apparatus and method for performing foreign object detection in a wireless power transfer system. The present specification discloses a method comprising receiving a digital ping from the wireless power transmitter; transmitting an identification and configuration packets to the wireless power transmitter; transmitting a foreign object detection (FOD) state packet which indicates a reference Q factor of the wireless power receiver to the wireless power transmitter; and receiving wireless power through magnetic coupling from the wireless power transmitter based on the foreign object detection result of the wireless power transmitter using the reference Q factor. Irrespective of individual characteristics of a wireless power receiver, accuracy and reliability of detecting a foreign object may be improved.