WIRELESS CHARGING DEVICE, AND POSITION DETECTION METHOD AND SYSTEM

WIPO Patent Application WO/2021/022837

A1

Disclosed in the present application are a wireless charging device, and a position detection method and system. The device comprises a transmit end or a receive end. The transmit end comprises a transmit-end resonant network and an inverter circuit, the transmit-end resonant network comprising a transmit coil. The receive end comprises a receive-end resonant network and a rectifier circuit, the receive-end resonant network comprising a receive coil. The receive end further comprises an auxiliary coil. During wireless charging, a voltage at either end of the auxiliary coil is generated by the current of the transmit coil. The device further comprises a controller. The controller is used for obtaining a relative position between the transmit end and the receive end according to a self inductance of the transmit coil and at least one of the following parameters, wherein the at least one of the parameters comprises: one or both of a coupling coefficient between the transmit coil and the auxiliary coil and a coil mutual inductance between the transmit coil and the auxiliary coil. A single change relation exists between the at least one of the parameters and the relative position. Therefore, the relative positon between the transmit end and the receive end for wireless charging can be accurately detected.

WU BAOSHAN (CN)
WU DONGHAO (CN)

PCT/CN2020/086548

February 11, 2021

April 24, 2020

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HUAWEI TECH CO LTD (CN)

H02J50/90

CN105334539A	2016-02-17
CN108363108A	2018-08-03
CN109895643A	2019-06-18
JP2015223009A	2015-12-10
CN201911424812A	2019-12-31
US20190045471W	2019-08-07
CN2020081503W	2020-03-26

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