US 11,888,331 B2
Sub-surface wireless charging and associated method
Petru Emanuel Stingu, Dallas, TX (US); Yulong Hou, Shanghai (CN); Kenneth Moore, Dallas, TX (US); and Ruwanga Dassanayake, Dallas, TX (US)
Assigned to Spark Connected LLC, Dallas, TX (US)
Filed by Spark Connected LLC, Dallas, TX (US)
Filed on Jun. 30, 2021, as Appl. No. 17/364,069.
Claims priority of provisional application 63/046,987, filed on Jul. 1, 2020.
Prior Publication US 2022/0006332 A1, Jan. 6, 2022
Int. Cl. H02J 50/90 (2016.01); H02J 50/00 (2016.01); H02J 50/10 (2016.01)
CPC H02J 50/90 (2016.02) [H02J 50/005 (2020.01); H02J 50/10 (2016.02)] 28 Claims
OG exemplary drawing
 
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.