US 11,936,211 B2
Mixed analog front-end for wireless charging
Eric Heindel Goodchild, Phoenix, AZ (US)
Assigned to AIRA, INC., Chandler, AZ (US)
Filed by AIRA, INC., Chandler, AZ (US)
Filed on May 4, 2022, as Appl. No. 17/736,689.
Claims priority of provisional application 63/184,776, filed on May 5, 2021.
Prior Publication US 2022/0360118 A1, Nov. 10, 2022
Int. Cl. H02J 50/80 (2016.01); H02J 7/00 (2006.01); H02J 50/10 (2016.01); H02J 50/90 (2016.01)
CPC H02J 50/80 (2016.02) [H02J 7/00034 (2020.01); H02J 50/10 (2016.02); H02J 50/90 (2016.02)] 20 Claims
OG exemplary drawing
 
8. A wireless charging device, comprising:
a plurality of charging cells provided on a surface of the wireless charging device;
an analog-to-digital converter circuit;
a high-pass filter configured to extract high-frequency components from a signal representative of tank voltage that is measured at a transmitting coil in one of the plurality of charging cells during a charging operation;
a first attenuator coupled to a rectifier, wherein the first attenuator and the rectifier are configured to attenuate the signal representative of tank voltage to obtain an attenuated signal that has a voltage level within a range of voltage levels consistent with voltage limits associated with an input to the analog-to-digital converter circuit;
a mixer configured to superimpose a signal representative of the high-frequency components on the attenuated signal by addition to obtain a scaled measurement signal; and
a demodulator configured to decode one or more messages associated with the charging operation from the scaled measurement signal.