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Effect of frequency and load on efficiency of inductive wireless power transfer systems

Amaya Colina, Arianna Ginette LU ; Kiong Lau, Buon LU ; Swaans, Laurens and Forsman, Mats (2023) 17th European Conference on Antennas and Propagation, EuCAP 2023
Abstract

Wireless charging of smartphones using inductive wireless power transfer (IWPT) has become very popular. However, the efficiency of IWPT systems can decrease substantially when the transmitting and receiving coils are not closely coupled. One popular approach to mitigate the efficiency degradation is to utilize higher frequency. However, the higher efficiency is only achieved at a specific range of load resistance, which may not be feasible in real applications. In this work, we analyze the effect of frequency and load variations on the power transfer efficiency of a typical two-coil IWPT setup, based on a numerical model. The results show that lower frequency systems are favored for low load resistances, and vice versa for high load... (More)

Wireless charging of smartphones using inductive wireless power transfer (IWPT) has become very popular. However, the efficiency of IWPT systems can decrease substantially when the transmitting and receiving coils are not closely coupled. One popular approach to mitigate the efficiency degradation is to utilize higher frequency. However, the higher efficiency is only achieved at a specific range of load resistance, which may not be feasible in real applications. In this work, we analyze the effect of frequency and load variations on the power transfer efficiency of a typical two-coil IWPT setup, based on a numerical model. The results show that lower frequency systems are favored for low load resistances, and vice versa for high load resistances. For example, when the coils' inductance is 20μH and the load resistance is below 3.4 ohms, then operation at lower frequencies is recommended even when the coupling factor is as low as 0.1.

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Please use this url to cite or link to this publication:
author
; ; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Inductive wireless power transfer, optimal load, power transfer efficiency, resonant frequency
host publication
17th European Conference on Antennas and Propagation, EuCAP 2023
article number
189071
publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
conference name
17th European Conference on Antennas and Propagation, EuCAP 2023
conference location
Florence, Italy
conference dates
2023-03-26 - 2023-03-31
external identifiers
  • scopus:85162273387
ISBN
9788831299077
DOI
10.23919/EuCAP57121.2023.10133398
language
English
LU publication?
yes
id
27f6f9a7-c1b6-4c52-b6fe-a8826ba2e8c1
date added to LUP
2023-10-30 11:09:29
date last changed
2023-11-08 10:53:31
@inproceedings{27f6f9a7-c1b6-4c52-b6fe-a8826ba2e8c1,
  abstract     = {{<p>Wireless charging of smartphones using inductive wireless power transfer (IWPT) has become very popular. However, the efficiency of IWPT systems can decrease substantially when the transmitting and receiving coils are not closely coupled. One popular approach to mitigate the efficiency degradation is to utilize higher frequency. However, the higher efficiency is only achieved at a specific range of load resistance, which may not be feasible in real applications. In this work, we analyze the effect of frequency and load variations on the power transfer efficiency of a typical two-coil IWPT setup, based on a numerical model. The results show that lower frequency systems are favored for low load resistances, and vice versa for high load resistances. For example, when the coils' inductance is 20μH and the load resistance is below 3.4 ohms, then operation at lower frequencies is recommended even when the coupling factor is as low as 0.1.</p>}},
  author       = {{Amaya Colina, Arianna Ginette and Kiong Lau, Buon and Swaans, Laurens and Forsman, Mats}},
  booktitle    = {{17th European Conference on Antennas and Propagation, EuCAP 2023}},
  isbn         = {{9788831299077}},
  keywords     = {{Inductive wireless power transfer; optimal load; power transfer efficiency; resonant frequency}},
  language     = {{eng}},
  publisher    = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
  title        = {{Effect of frequency and load on efficiency of inductive wireless power transfer systems}},
  url          = {{http://dx.doi.org/10.23919/EuCAP57121.2023.10133398}},
  doi          = {{10.23919/EuCAP57121.2023.10133398}},
  year         = {{2023}},
}