US 12,418,201 B2
System and method for wireless charging foreign object detection
Ali Ramezani, Toronto (CA); and Si Tan Wang, Toronto (CA)
Assigned to ELEAPPOWER LTD., Toronto (CA)
Appl. No. 19/120,880
Filed by ELEAPPOWER LTD., Toronto (CA)
PCT Filed Oct. 14, 2023, PCT No. PCT/CA2023/051370
§ 371(c)(1), (2) Date Apr. 14, 2025,
PCT Pub. No. WO2024/077400, PCT Pub. Date Apr. 18, 2024.
Claims priority of provisional application 63/416,352, filed on Oct. 14, 2022.
Prior Publication US 2025/0260267 A1, Aug. 14, 2025
Int. Cl. H02J 50/60 (2016.01); B60L 53/124 (2019.01); G01D 5/20 (2006.01); H02J 50/10 (2016.01); H02J 50/90 (2016.01)
CPC H02J 50/60 (2016.02) [B60L 53/124 (2019.02); G01D 5/204 (2013.01); H02J 50/10 (2016.02); H02J 50/90 (2016.02)] 20 Claims
OG exemplary drawing
 
1. A system for detection of one or more foreign objects during wireless charging adapted for continued operation despite a misalignment of a transmitter coil and a receiver coil, the system comprising:
a set of sensor coils positioned relative to charging coils of a wireless transmitter, the set of sensor coils including a first sensor coil set and a second sensor coil set that are mirrored about one or more axes of radial symmetry from one another relative to a plane of operation of the wireless transmitter;
at least one comparator coupled to coils in the first sensor coil set and coils in the second sensor coil set to determine differential voltages or currents between the first sensor coil set and the second sensor coil set;
wherein changes in induced voltage or current in the first sensor coil set and the second sensor coil set due to the misalignment of the transmitter coil and the receiver coil are compensated due to positioning of the first sensor coil set and the second sensor coil set relative to one another.