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1. (WO2018053848) A CHARGING DEVICE HAVING SMALL LOOP TRANSMISSION COILS FOR WIRELESS CHARGING A TARGET DEVICE

Pub. No.:    WO/2018/053848    International Application No.:    PCT/CN2016/100139
Publication Date: Fri Mar 30 01:59:59 CEST 2018 International Filing Date: Tue Sep 27 01:59:59 CEST 2016
IPC: H02J 50/12
Applicants: HONG KONG APPLIED SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE COMPANY LIMITED
Inventors: LIU, Yan
CHEN, Jun
Title: A CHARGING DEVICE HAVING SMALL LOOP TRANSMISSION COILS FOR WIRELESS CHARGING A TARGET DEVICE
Abstract:
A charging device to wirelessly charge a target device, including: a coil antenna having a first surface facing a first direction at which the target device is placed for charging and a second surface facing an opposite direction from the first direction, generating a first magnetic field; a plurality of pairs of metallic small loop transmission coils arranged to the second surface side of the coil antenna, to generate a second magnetic field in response to the first magnetic field to enhance the first magnetic field, the first and second magnetic fields being directed in the first direction; and wherein a first one of each pair of metallic small loop transmission coils is coupled to a second one of the pair in parallel and a size of the first one of each pair is different from that of the second one of the pair, such that when a distance between the target device and the first surface is changed, one of the pair of metallic small loop transmission coils is enabled to be resonant with the coil antenna.