US 12,272,971 B2
Excitation-quadrature-quadrature transmitter wireless power transfer system
Zhichao Luo, Toronto (CA); Shuang Nie, Toronto (CA); Mehanathan Pathmanathan, Toronto (CA); and Peter Waldemar Lehn, Toronto (CA)
Assigned to INNOVATIONS & PARTNERSHIPS OFFICE UNIVERSITY OF TORONTO, Toronto (CA); and ELEAPPOWER LTD., Toronto (CA)
Appl. No. 18/275,746
Filed by THE GOVERNING COUNCIL OF THE UNIVERSITY OF TORONTO, Toronto (CA); and ELEAPPOWER LTD., Toronto (CA)
PCT Filed Feb. 9, 2022, PCT No. PCT/CA2022/050182
§ 371(c)(1), (2) Date Aug. 3, 2023,
PCT Pub. No. WO2022/170424, PCT Pub. Date Aug. 18, 2022.
Claims priority of provisional application 63/147,637, filed on Feb. 9, 2021.
Prior Publication US 2024/0039345 A1, Feb. 1, 2024
Int. Cl. H02J 50/90 (2016.01); B60L 53/122 (2019.01); B60L 53/39 (2019.01); H02J 50/12 (2016.01); H02J 50/40 (2016.01)
CPC H02J 50/90 (2016.02) [B60L 53/122 (2019.02); B60L 53/39 (2019.02); H02J 50/12 (2016.02); H02J 50/402 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A wireless charging system adapted for lateral misalignment tolerance, the wireless charging system comprising:
a transmitter pad, the transmitter pad including:
an excitation coil coupled to a power source;
a first auxiliary charging coil inductively coupled to the excitation coil and not physically coupled to the power source, the first auxiliary charging coil has a larger surface area than the excitation coil and is positioned at a first height relative to the excitation coil having a corresponding midpoint offset relative to a midpoint of the excitation coil; and
a second auxiliary charging coil inductively coupled to the excitation coil and not physically coupled to the power source, the second auxiliary charging coil has a larger surface area than the excitation coil and is positioned at a second height relative to the excitation coil having a corresponding midpoint offset relative to the midpoint of the excitation coil, the second auxiliary charging coil overlaps with the first auxiliary charging coil relative to a plane of the excitation coil, the overlap relative to the plane of the excitation coil inductively decouples the first and second auxiliary charring coils;
a first auxiliary tank, comprising the first auxiliary charging coil and at least one or more first auxiliary charging coil compensation capacitors;
a second auxiliary tank, comprising the second auxiliary charging coil and at least one or more second auxiliary charging coil compensation capacitors, the second auxiliary tank has a matching impedance with the first auxiliary tank, due to the compensation of the first and second auxiliary compensation capacitors, so that the first and second auxiliary tanks are electrically symmetrical along a horizontal plane with respect to the midpoint of the excitation coil;
a receiver pad magnetically coupled to the first auxiliary charging coil and the second auxiliary charming coil, and laterally misaligned with the midpoint of the excitation coil the first auxiliary charging coil and the second auxiliary charging coil together project a magnetic flux to interface with the receiver pad;
wherein the at least one or more first auxiliary charging coil compensation capacitors and the at least one or more second auxiliary charging coil compensation capacitors have corresponding variable and selectable capacitances that are selected to, free of active control of the capacitors, maintain a substantially zero phase angle (ZPA) condition between an excitation voltage and an excitation current during interfacing with the receiver pad such that the projected magnetic flux is effectively steered in a direction of the receiver pad through an automatic biasing of current distribution in the first auxiliary charging coil and the second auxiliary charging coil towards the auxiliary charging coil which is nearest to the receiver pad to reduce leakage magnetic flux from the auxiliary charging coil which is farthest from the receiver pad.