US 12,444,990 B2
Method for detecting foreign material, and device and system therefor
Jae Hee Park, Seoul (KR); and Yong II 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. 18/355,909.
Application 18/355,909 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 2023/0361622 A1, Nov. 9, 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)] 8 Claims
OG exemplary drawing
 
1. A method of receiving power by a wireless power receiver, the method comprising:
transmitting, to a wireless power transmitter, a plurality of packets including a foreign object detection (FOD) status packet; and
receiving, from the wireless power transmitter, a response signal indicating whether a foreign object is present in a charging area of the wireless power transmitter,
wherein the response signal is determined using a measured peak frequency of a power signal transmitted by the wireless power transmitter and a reference peak frequency included in the FOD status packet received from the wireless power receiver,
wherein each of the plurality of packets includes a preamble, a header, a message, and a checksum for identifying whether an error occurs in each packet,
wherein the header is configured to identify a type of the each packet,
wherein the plurality of packets further include an end power transfer packet having a header value of “0x02” and a message size of 1 byte, and the end power transfer packet is used in both a ping phase and a power transfer phase, and
wherein the reference peak frequency is a value when no foreign object is present in the charging area of the wireless power transmitter.