NDLI: Phase-detection-based metal objects and pick-up coils detection scheme without malfunction in wireless power transfer system

Content Provider	IET Digital Library
Author	Li, Liang Wang, Junhua Cai, Changsong Lin, Zhongzheng Hu, Meilin Zhang, Fan
Abstract	Metal object detection (MOD) and detection of position (DoP) of pick-up coils are increasingly critical to the commercialisation of the wireless power transfer system. In this study, a detection scheme based on phase-detection, which can both realise the function of MOD and DoP, is newly introduced. The method is based on the principle that the presence of metal objects and pick-up coils both affect the impedance phase of the detection coil loop. Comparing with the traditional detection methods, which is based on measuring the absolutely value of impedance in detection loop, the malfunction is avoided by adopting phase difference as the criterion of the existence of metal objects and pick-up coils. An inexpensive and high-precision sensing circuit is newly designed to acquire the phase difference accurately. Simulation models and experiments are conducted to verify the feasibility of the proposed detection scheme. The Δ δ of the detection coil circuit with a coin placed reaches −5.17, while the Δ δ of other detection coils without metal objects keeps zero. In the meantime, the position of the pick-up coil is identified because the Δ δ of these detection coils closer to the centre of the pick-up coil varies more significantly while other coils vary slightly.
Starting Page	2222
Ending Page	2230
Page Count	9
ISSN	17518660
Volume Number	14
e-ISSN	17518679
Issue Number	Issue 11, Nov (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-epa/14/11
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-epa.2019.1036
Journal	IET Electric Power Applications
Publisher Date	2020-07-17
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Coils Detection Coil Circuit Detection Coil Loop Detection Coils Detection Loop Detection Scheme DoP Impedance Phase Inductive Power Transmission Malfunction Metal Object Detection MOD Object Detection Phase Difference Phase-detection-based Scheme Pick-up Coil Varies Signal Detection Statistics Wireless Power Transfer System Wireless Power Transmission System
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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