US 12,444,992 B2
Method for detecting foreign material, and device and system therefor
Jae Hee Park, Seoul (KR); and Yong Il Kwon, Seoul (KR)
Assigned to LG INNOTEK CO., LTD., Seoul (KR)
Filed by LG INNOTEK CO., LTD., Seoul (KR)
Filed on Jul. 20, 2023, as Appl. No. 18/355,998.
Application 18/355,998 is a continuation of application No. 18/298,896, filed on Apr. 11, 2023, granted, now 12,034,317.
Application 18/298,896 is a continuation of application No. 17/318,000, filed on May 12, 2021, granted, now 11,646,607, issued on May 9, 2023.
Application 17/318,000 is a continuation of application No. 16/314,559, granted, now 11,070,095, issued on Jul. 20, 2021, previously published as PCT/KR2017/006975, filed on Jun. 30, 2017.
Claims priority of application No. 10-2016-0083406 (KR), filed on Jul. 1, 2016; application No. 10-2016-0090701 (KR), filed on Jul. 18, 2016; application No. 10-2016-0093483 (KR), filed on Jul. 22, 2016; and application No. 10-2016-0095293 (KR), filed on Jul. 27, 2016.
Prior Publication US 2023/0369906 A1, Nov. 16, 2023
Int. Cl. H02J 50/60 (2016.01); G01N 27/02 (2006.01); G01R 27/26 (2006.01); H02J 3/02 (2006.01); H02J 7/00 (2006.01); H02J 7/02 (2016.01); H02J 13/00 (2006.01); H02J 50/12 (2016.01)
CPC H02J 50/60 (2016.02) [G01N 27/02 (2013.01); G01R 27/26 (2013.01); H02J 3/02 (2013.01); H02J 7/00308 (2020.01); H02J 7/02 (2013.01); H02J 13/00001 (2020.01); H02J 50/12 (2016.02); H02J 7/00045 (2020.01)] 6 Claims
OG exemplary drawing
 
1. A method of transmitting power by a wireless power transmitter, the method comprising:
receiving a foreign object detection (FOD) status packet from a wireless power receiver;
determining whether a foreign object is present in a charging area of the wireless power transmitter on the basis of the FOD status packet; and
transmitting, to the wireless power receiver, a response signal indicating whether the foreign object is present in the charging area of the wireless power transmitter on the basis of a result of the determination,
wherein the response signal is determined by a threshold value based on a reference peak frequency included in the FOD status packet received from the wireless power receiver,
wherein the threshold value is determined by the wireless power transmitter based on a difference between the wireless power transmitter and a reference coil type used to determine the reference peak frequency, and
wherein the FOD status packet includes a preamble, a header, a message, and a checksum for identifying whether an error occurs in the packet.