Patent ID: 11888331
Assignee: SPARK CONNECTED LLC
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. A wireless power transmitter comprising:
a transmitting coil configured to wireless transmit power via a magnetic field towards a wireless power transmission space;
a ferrite core;
a housing disposed between the transmitting coil and the wireless power transmission space, wherein the ferrite core and the transmitting coil are disposed in the housing;
a sensor comprising concentric differential coils having an inner coil and an outer coil so that respective currents are flowable through the inner and outer coils in opposite directions, wherein the inner coil and the outer coil have the same inductance; and
a controller configured to:
measure, via the sensor, the magnetic field in the wireless power transmission space during a first time and generate a first measurement,
measure, via the sensor, the magnetic field in the wireless power transmission space during a second time and generate a second measurement, the second time being after the first time, and
when a magnitude of a difference between the first measurement and the second measurement is higher than a predetermined threshold, determine a movement or a position of a wireless power receiver in the wireless power transmission space.