Patent ID: 11876386
Assignee: NUCURRENT, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A wireless power transmission system configured for communications with one or more wireless power receiver systems operating within a frequency band, the wireless power transmission system comprising:
at least one wireless power transmitter including a power transmitting coil, the at least one wireless power transmitter configured to transmit electrical power, within a charge volume, to the one or more wireless power receiver systems;
a wireless power transfer circuit electrically connectable to the at least one wireless power transmitter, the wireless power transfer circuit including, at least, driving circuitry; and
a transmitter controller, transmitter controller configured for, at least, controlling the at least one wireless power transmitter and communicating with at least one receiver controller of the one or more wireless power receiver systems, the transmitter controller configured to
perform an initial foreign object detection prior to any transmission of wireless power, the initial foreign object detection for detecting presence of a foreign object within the charge volume of the at least one wireless power transmitter, the initial foreign object detection including,
setting a calibration quality factor (Q) when no object is present in the charge volume,
determining an initial Q at the power transmitting coil, and
determine if the initial Q is within a receiver Q range,

begin wireless power transfer negotiations with sending an authentication message to one of the one or more wireless power receiver systems, if the initial Q has a value in a range indicating that an object in the charge volume is one of the one or more wireless power receiver systems, and
perform a continuous foreign object detection, during one or more of the wireless power transfer negotiations or wireless power transfer, if the initial Q has the value in the range indicating that an object in the charge volume is one of the one or more wireless power receiver systems.