US 12,413,104 B1
Power loss accounting method for in-power foreign object detection
Santosh Bhandarkar, Chandler, AZ (US)
Assigned to Microchip Technology Incorporated, Chandler, AZ (US)
Filed by Microchip Technology Incorporated, Chandler, AZ (US)
Filed on Aug. 9, 2024, as Appl. No. 18/799,456.
Claims priority of provisional application 63/642,823, filed on May 5, 2024.
Int. Cl. H02J 50/60 (2016.01); H02J 50/10 (2016.01)
CPC H02J 50/60 (2016.02) [H02J 50/10 (2016.02)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
providing a transmitter coil;
measuring inductance and resistance of the transmitter coil in standalone conditions using a meter circuit when a plurality of currents are applied to the transmitter coil;
providing a receiver coil mated to the transmitter coil without a foreign object present;
measuring inductance and resistance of the transmitter coil and receiver coil in mated conditions using the LCR meter circuit when the plurality of currents are applied to the transmitter coil;
generating a simulation model based on measured inductance and resistance of the transmitter coil and receiver coil and comprising a characteristic curve as a function of the plurality of currents applied to the transmitter coil;
providing a receiver coil mated to the transmitter coil with a foreign object present; and
detecting the foreign object by detecting a power loss from the transmitter coil to the receiver coil based on the simulation model.