US 12,294,228 B2
Systems including resonator circuits and methods for wireless charging using same
Joshua R. Smith, Seattle, WA (US); and Xingyi Shi, Seattle, WA (US)
Assigned to University of Washington, Seattle, WA (US)
Appl. No. 17/905,163
Filed by University of Washington, Seattle, WA (US)
PCT Filed Feb. 25, 2021, PCT No. PCT/US2021/019699
§ 371(c)(1), (2) Date Aug. 26, 2022,
PCT Pub. No. WO2021/173854, PCT Pub. Date Sep. 2, 2021.
Claims priority of provisional application 62/983,033, filed on Feb. 28, 2020.
Prior Publication US 2023/0144336 A1, May 11, 2023
Int. Cl. H02J 50/12 (2016.01); H02J 7/00 (2006.01); H02J 7/34 (2006.01); H02J 50/00 (2016.01); H02J 50/50 (2016.01); H02J 50/80 (2016.01); H02J 50/90 (2016.01)
CPC H02J 50/502 (2020.01) [H02J 7/0063 (2013.01); H02J 7/342 (2020.01); H02J 50/005 (2020.01); H02J 50/12 (2016.02); H02J 50/80 (2016.02); H02J 50/90 (2016.02)] 27 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a plurality of resonator circuits, each comprising:
a resonator; and
a control circuit comprising at least one transistor, wherein the at least one transistor comprises a parasitic capacitance, and wherein the at least one transistor is coupled to the resonator; and
a controller coupled to the plurality of resonator circuits, the controller configured to provide control signals to the control circuit of each of the plurality of resonator circuits, the control signals configured to control:
selected ones of the plurality of resonator circuits to add the parasitic capacitance to an impedance of the selected ones to have a first resonant frequency, wherein the first resonant frequency is configured to transmit power at an operating frequency; and
other ones of the plurality of resonator circuits to subtract or remove the parasitic capacitance from an impedance of the other ones to have a second resonant frequency;
wherein the controller is further configured to receive reflections or reflection coefficients from each of the resonator circuits, and wherein the controller is further configured to scan through multiple arrangements of activated resonator circuits of the plurality of resonator circuits to identify a presence, an absence, a location, or combinations thereof of one or more electronic devices using the reflection coefficients.