US 12,374,938 B2
Wireless charging alignment method and apparatus, wireless charging system, and electric vehicle
Xiaosheng Zeng, Dongguan (CN); Yunhe Mao, Shenzhen (CN); Shuangquan Chen, Dongguan (CN); and Qitang Liu, Shenzhen (CN)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed by HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed on Oct. 15, 2021, as Appl. No. 17/502,243.
Application 17/502,243 is a continuation of application No. PCT/CN2020/070395, filed on Jan. 6, 2020.
Claims priority of application No. 201910314533.X (CN), filed on Apr. 18, 2019.
Prior Publication US 2022/0069638 A1, Mar. 3, 2022
Int. Cl. H02J 50/90 (2016.01); B60L 53/12 (2019.01); B60L 53/38 (2019.01); H02J 50/12 (2016.01)
CPC H02J 50/90 (2016.02) [B60L 53/12 (2019.02); B60L 53/38 (2019.02); H02J 50/12 (2016.02)] 20 Claims
OG exemplary drawing
 
1. A wireless charging alignment apparatus, comprising:
a power receive coil;
a location detection coil;
a first detection circuit;
a second detection circuit; and
a location determining circuit, wherein
the power receive coil is configured to exchange power with a power transmit coil of through electromagnetic mutual inductance,
the first detection circuit is configured to detect a first induction signal of the power receive coil in a positioning magnetic field generated by the power transmit coil,
the second detection circuit is configured to detect a second induction signal of the location detection coil in the positioning magnetic field, and
the location determining circuit is configured to determine, as a location of the power receive coil relative to the power transmit coil based on a correspondence between an offset location and each of an induction signal of the power receive coil and an induction signal of the location detection coil, the offset location corresponding to the first induction signal and the second induction signal, wherein
the location determining circuit is further configured to:
determine a first difference between a signal value of the first induction signal and a signal value of the induction signal of the power receive coil in each signal group from a plurality of signal groups, and a second difference between a signal value of the second induction signal and a signal value of the induction signal of the location detection coil in each signal group from the plurality of signal groups, to obtain the first difference and the second difference of each signal group, respectively; and
determine, as the offset location corresponding to the first induction signal and the second induction signal, the offset location corresponding to a signal group whose sum of the first difference and the second difference is the smallest in the plurality of signal groups.