US 12,444,989 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. 18/355,898.
Application 18/355,898 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 2024/0030751 A1, Jan. 25, 2024
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 wireless power transmitter that transmits power to a wireless power receiver, the wireless power transmitter comprising:
a communication unit configured to communicate with the wireless power receiver; and
a controller,
wherein the communication unit receives a plurality of packets including a foreign object detection (FOD) status packet from the wireless power receiver,
wherein the controller determines whether a foreign object is present in a charging area of the wireless power transmitter on the basis of the FOD status packet,
wherein the communication unit transmits, 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 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, and
wherein the measured peak frequency is measured by the wireless power transmitter before a ping phase.