US 12,476,491 B2
Detection signal, wireless charging method and wireless charging device
Shengyi Yang, Shanghai (CN); Bin Li, Shanghai (CN); and Yayu Li, Shanghai (CN)
Assigned to Delta Electronics (Shanghai) Co., Ltd., Shanghai (CN)
Filed by Delta Electronics (Shanghai) Co., Ltd., Shanghai (CN)
Filed on Jul. 1, 2022, as Appl. No. 17/810,345.
Claims priority of application No. 202110827157.1 (CN), filed on Jul. 21, 2021.
Prior Publication US 2023/0035613 A1, Feb. 2, 2023
Int. Cl. H02J 50/12 (2016.01); H02J 7/00 (2006.01); H02J 50/80 (2016.01); H02J 50/90 (2016.01)
CPC H02J 50/12 (2016.02) [H02J 7/00045 (2020.01); H02J 50/80 (2016.02); H02J 50/90 (2016.02)] 15 Claims
OG exemplary drawing
 
1. A method for detecting a power receiving device in wireless charging, comprising:
transmitting a detection signal to detect presence of the power receiving device in a wireless charging field, wherein
the detection signal is configured to wake up the power receiving device in the wireless charging field, and cause the power receiving device to generate a feedback signal based on a modulation wave of about 2 kHz;
a duration time of the detection signal is greater than 1 millisecond and less than 65 milliseconds; and
the detection signal is configured to identify the modulation wave.