Metal-rim-connected inductive coupler for smartwatch applications

A metal-rim-connected inductive coupler with series-none compensation topology is proposed for smartwatch applications. By cross-connecting the receiving coil to the metal rim with a 1 mm slot, the direction of the induced current on the metal rim is transformed to be the same as the current flowing...

Full description

Saved in:
Bibliographic Details
Published in:IET power electronics 2020-11, Vol.13 (15), p.3428-3434
Main Authors: Zhu, Jia-Qi, Ban, Yong-Ling, Zhang, Yiming, Yan, Zhengchao, Xu, Rui-Min, Mi, Chunting Chris
Format: Article
Language:English
Subjects:
coils
coil‐to‐coil efficiency
electric connectors
metal rim
metal‐rim‐connected inductive coupler
power 5.0 W
receiving coil
Research Article
series‐none compensation topology
size 1.0 mm
smartwatch applications
transmitting coil
wearable computers
Citations: Items that this one cites
Items that cite this one
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A metal-rim-connected inductive coupler with series-none compensation topology is proposed for smartwatch applications. By cross-connecting the receiving coil to the metal rim with a 1 mm slot, the direction of the induced current on the metal rim is transformed to be the same as the current flowing on the receiving coil, leading to a strong magnetic coupling between the transmitting coil and receiving coil. Considering the space limitation in the smartwatch, non-compensation components are needed inside the smartwatch and only a series capacitance is integrated on the transmitter side. A prototype of the proposed inductive coupler has been built and the wireless power transfer through metal rim has been validated via experiment. The experimental results show that the prototype achieves 5 W output power with 87.4% coil-to-coil efficiency.
ISSN:1755-4535
1755-4543
DOI:10.1049/iet-pel.2020.0208