US 12,113,371 B2
Low power object detection in multi-coil wireless charging systems and related systems, methods, and devices
Santosh Bhandarkar, Chandler, AZ (US); and Alex Dumais, Boise, ID (US)
Assigned to Microchip Technology, Inc., Chandler, AZ (US)
Filed by Microchip Technology Incorporated, Chandler, AZ (US)
Filed on Mar. 20, 2023, as Appl. No. 18/186,837.
Application 18/186,837 is a continuation of application No. 17/451,673, filed on Oct. 21, 2021, granted, now 11,611,243.
Application 17/451,673 is a continuation of application No. 16/863,865, filed on Apr. 30, 2020, granted, now 11,159,062, issued on Oct. 26, 2020.
Claims priority of provisional application 62/984,722, filed on Mar. 3, 2020.
Prior Publication US 2023/0231420 A1, Jul. 20, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H02J 50/60 (2016.01); G01R 27/26 (2006.01); H02J 50/12 (2016.01); H02J 50/40 (2016.01)
CPC H02J 50/60 (2016.02) [G01R 27/2611 (2013.01); H02J 50/12 (2016.02); H02J 50/402 (2020.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus, comprising:
a terminal to receive a measurement voltage potential at least partially responsive to a tank circuit signal at a tank circuit of a wireless power transmitter, the tank circuit including a plurality of transmit coils; and
a processing core to:
control provision of an alternating current (AC) signal to charge each of the plurality of transmit coils one at a time; and
select a transmit coil from the plurality of transmit coils to use to transmit wireless power to a receive coil of a wireless power receiver responsive to at least one of a resonant frequency and a Q-factor for each transmit coil of the plurality of transmit coils determined in absence of the AC signal after completion of provision of the AC signal to the tank circuit.