Compact Distance-Adaptive Wireless Power Transfer Using a Reconfigurable Auxiliary Coil

Weijun Hong; Jingchen Wang; Eng Gee Lim; Mark Leach; Zhao Wang; Rui Pei; Yi Huang

doi:10.1109/LAWP.2025.3526916

Compact Distance-Adaptive Wireless Power Transfer Using a Reconfigurable Auxiliary Coil

Weijun Hong, Jingchen Wang^*, Eng Gee Lim^*, Mark Leach, Zhao Wang, Rui Pei, Yi Huang

^*Corresponding author for this work

University of Liverpool

Research output: Contribution to journal › Article › peer-review

Abstract

In this letter, we propose a distance-adaptive wireless power transfer (WPT) system using a reconfigurable transmitter. The proposed transmitter incorporates a main coil and an auxiliary coil with adjustable currents. The auxiliary coil can be configured to directly control the coupling strength, which can mitigate excessive or insufficient coupling caused by distance variations. The distance adaptation capability of the proposed WPT system is verified through both simulations and experiments. Measurements of transmission coefficients show maximum increase of 64% at close range (15 mm) and 57% at long range (110 mm). The overall effective transmission range has been improved by 59%. The proposed design offers a simple yet effective approach to distance adaptation while maintaining compact system dimensions.

Original language	English
Pages (from-to)	1114-1118
Number of pages	5
Journal	IEEE Antennas and Wireless Propagation Letters
Volume	24
Issue number	5
Early online date	8 Jan 2025
DOIs	https://doi.org/10.1109/LAWP.2025.3526916
Publication status	Published - May 2025

Keywords

Distance adaptive
frequency splitting
range improvement
reconfigurable
wireless power transfer (WPT)

Access to Document

10.1109/LAWP.2025.3526916

Cite this

@article{5f501b28f8544901bf43fd5ba676367b,

title = "Compact Distance-Adaptive Wireless Power Transfer Using a Reconfigurable Auxiliary Coil",

abstract = "In this letter, we propose a distance-adaptive wireless power transfer (WPT) system using a reconfigurable transmitter. The proposed transmitter incorporates a main coil and an auxiliary coil with adjustable currents. The auxiliary coil can be configured to directly control the coupling strength, which can mitigate excessive or insufficient coupling caused by distance variations. The distance adaptation capability of the proposed WPT system is verified through both simulations and experiments. Measurements of transmission coefficients show maximum increase of 64\% at close range (15 mm) and 57\% at long range (110 mm). The overall effective transmission range has been improved by 59\%. The proposed design offers a simple yet effective approach to distance adaptation while maintaining compact system dimensions.",

keywords = "Distance adaptive, frequency splitting, range improvement, reconfigurable, wireless power transfer (WPT)",

author = "Weijun Hong and Jingchen Wang and Lim, \{Eng Gee\} and Mark Leach and Zhao Wang and Rui Pei and Yi Huang",

note = "Publisher Copyright: {\textcopyright} 2002-2011 IEEE.",

year = "2025",

month = may,

doi = "10.1109/LAWP.2025.3526916",

language = "English",

volume = "24",

pages = "1114--1118",

journal = "IEEE Antennas and Wireless Propagation Letters",

issn = "1536-1225",

number = "5",

}

TY - JOUR

T1 - Compact Distance-Adaptive Wireless Power Transfer Using a Reconfigurable Auxiliary Coil

AU - Hong, Weijun

AU - Wang, Jingchen

AU - Lim, Eng Gee

AU - Leach, Mark

AU - Wang, Zhao

AU - Pei, Rui

AU - Huang, Yi

PY - 2025/5

Y1 - 2025/5

N2 - In this letter, we propose a distance-adaptive wireless power transfer (WPT) system using a reconfigurable transmitter. The proposed transmitter incorporates a main coil and an auxiliary coil with adjustable currents. The auxiliary coil can be configured to directly control the coupling strength, which can mitigate excessive or insufficient coupling caused by distance variations. The distance adaptation capability of the proposed WPT system is verified through both simulations and experiments. Measurements of transmission coefficients show maximum increase of 64% at close range (15 mm) and 57% at long range (110 mm). The overall effective transmission range has been improved by 59%. The proposed design offers a simple yet effective approach to distance adaptation while maintaining compact system dimensions.

AB - In this letter, we propose a distance-adaptive wireless power transfer (WPT) system using a reconfigurable transmitter. The proposed transmitter incorporates a main coil and an auxiliary coil with adjustable currents. The auxiliary coil can be configured to directly control the coupling strength, which can mitigate excessive or insufficient coupling caused by distance variations. The distance adaptation capability of the proposed WPT system is verified through both simulations and experiments. Measurements of transmission coefficients show maximum increase of 64% at close range (15 mm) and 57% at long range (110 mm). The overall effective transmission range has been improved by 59%. The proposed design offers a simple yet effective approach to distance adaptation while maintaining compact system dimensions.

KW - Distance adaptive

KW - frequency splitting

KW - range improvement

KW - reconfigurable

KW - wireless power transfer (WPT)

UR - https://www.scopus.com/pages/publications/85214896801

U2 - 10.1109/LAWP.2025.3526916

DO - 10.1109/LAWP.2025.3526916

M3 - Article

SN - 1536-1225

VL - 24

SP - 1114

EP - 1118

JO - IEEE Antennas and Wireless Propagation Letters

JF - IEEE Antennas and Wireless Propagation Letters

IS - 5

ER -

Compact Distance-Adaptive Wireless Power Transfer Using a Reconfigurable Auxiliary Coil

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this