Patent ID: 11881724
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
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 group of coils connected to the first inverter through the first switch;
a second group of coils 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 group of coils, and the second group of coils,
wherein the processor is configured to:
transmit a first ping signal through the first group of coils and the second group of coils;
sense a change in current, voltage, and/or frequency occurring in the first group of coils and the second group of coils in response to the first ping signal to detect that at least one electronic device is placed on or in proximity to the wireless charging device;
select at least one coil from the first group of coils and at least one coil from the second group of coils at which the change in current, voltage, and/or frequency is sensed;
transmit a second ping signal through the selected at least one coil of the first group of coils and the selected at least one coil of the second group of coils;
wirelessly transmit power to the at least one electronic device by using the selected at least one coil of the first group of coils and the selected at least one coil of the second group of coils; and
set remaining coils other than the selected at least one coil of the first group of coils and the selected at least one coil of the second group of coils as charging standby coils.