US 11,862,990 B2
Wireless charging device and method for charging electronic device using the same
Wooram Lee, Gyeonggi-do (KR); Dohyeon Kim, Gyeonggi-do (KR); Seho Park, Gyeonggi-do (KR); and Mingi Song, Gyeonggi-do (KR)
Assigned to Samsung Electronics Co., Ltd
Filed by Samsung Electronics Co., Ltd., Gyeonggi-do (KR)
Filed on Feb. 18, 2021, as Appl. No. 17/178,707.
Claims priority of application No. 10-2020-0025130 (KR), filed on Feb. 28, 2020.
Prior Publication US 2021/0273491 A1, Sep. 2, 2021
Int. Cl. H02J 7/00 (2006.01); H02J 50/40 (2016.01); H02J 50/80 (2016.01); H02J 50/12 (2016.01)
CPC H02J 50/402 (2020.01) [H02J 50/12 (2016.02); H02J 50/80 (2016.02); H02J 2310/22 (2020.01)] 17 Claims
OG exemplary drawing
 
1. A wireless charging device comprising:
a first inverter,
a first switch electrically connected to the first inverter;
a second inverter,
a second switch electrically connected to the second inverter;
a first coil group connected to the first inverter through the first switch;
a second coil group connected to the second inverter through the second switch; and
a processor operatively connected to the first inverter, the first switch, the second inverter, the second switch, the first coil group, and the second coil group,
wherein the processor is configured to:
detect an electronic device disposed above the wireless charging device through at least one coil in the first coil group or the second coil group, and
wirelessly transmit power to the electronic device by using one coil in the first coil group and one coil in the second coil group, and
wherein the processor is further configured to:
transmit a ping signal to the electronic device through each of the first coil group and the second coil group when the electronic device is detected,
identify a position of the electronic device through a feedback signal including a signal strength packet (SSP) signal returned from the electronic device, and
select, as operating coils, a coil having a largest value of the SSP signal in the first coil group and a coil having a largest value of the SSP signal in the second coil group.