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

Claim 0:
1. A method comprising:
wirelessly transmitting power to a receiving coil from a transmitting coil of a wireless power transmitter via a magnetic field, wherein the receiving coil is in a wireless power transmission space of the transmitting coil;
measuring, by a sensor of the wireless power transmitter, the magnetic field in the wireless power transmission space during a first time and generating an output of a first measurement;
measuring, by the sensor of the wireless power transmitter, the magnetic field in the wireless power transmission space during a second time and generating an output of 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, determining a movement or a position of the receiving coil and stopping wirelessly transmitting power to the receiving coil with the transmitting coil,
wherein the sensor comprises differential pizza-slice-type coils with a first pizza-slice-type element and a second pizza-slice-type element,
wherein the first pizza-slice-type element is disposed along a first axis of the wireless power transmitter and configured to detect motion along the first axis by a wireless power receiver comprising the receiving coil, and
wherein the second pizza-slice-type element is disposed along a second axis of the wireless power transmitter and configured to detect motion along the second axis by the wireless power receiver, the second axis being different than the first axis.