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

Arianna Ginette Amaya Colina; Buon Kiong Lau; Laurens Swaans; Mats Forsman

doi:10.23919/EuCAP57121.2023.10133398

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

Arianna Ginette Amaya Colina, Buon Kiong Lau, Laurens Swaans, Mats Forsman

Research output: Chapter in Book/Report/Conference proceeding › Paper in conference proceeding › peer-review

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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 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.

Original language	English
Title of host publication	17th European Conference on Antennas and Propagation, EuCAP 2023
Publisher	IEEE - Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9788831299077
DOIs	https://doi.org/10.23919/EuCAP57121.2023.10133398
Publication status	Published - 2023
Event	17th European Conference on Antennas and Propagation, EuCAP 2023 - Florence, Italy Duration: 2023 Mar 26 → 2023 Mar 31

Conference

Conference	17th European Conference on Antennas and Propagation, EuCAP 2023
Country/Territory	Italy
City	Florence
Period	2023/03/26 → 2023/03/31

Subject classification (UKÄ)

Other Electrical Engineering, Electronic Engineering, Information Engineering

Free keywords

Inductive wireless power transfer
optimal load
power transfer efficiency
resonant frequency

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10.23919/EuCAP57121.2023.10133398

eucap2023_publishedFinal published version, 465 KBLicence: CC BY

Cite this

@inproceedings{27f6f9a7c1b64c52b6fea8826ba2e8c1,

title = "Effect of frequency and load on efficiency of inductive wireless power transfer systems",

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 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.",

keywords = "Inductive wireless power transfer, optimal load, power transfer efficiency, resonant frequency",

author = "\{Amaya Colina\}, \{Arianna Ginette\} and \{Kiong Lau\}, Buon and Laurens Swaans and Mats Forsman",

year = "2023",

doi = "10.23919/EuCAP57121.2023.10133398",

language = "English",

booktitle = "17th European Conference on Antennas and Propagation, EuCAP 2023",

publisher = "IEEE - Institute of Electrical and Electronics Engineers Inc.",

address = "United States",

note = "17th European Conference on Antennas and Propagation, EuCAP 2023 ; Conference date: 26-03-2023 Through 31-03-2023",

}

Amaya Colina, AG, Kiong Lau, B, Swaans, L & Forsman, M 2023, Effect of frequency and load on efficiency of inductive wireless power transfer systems. in 17th European Conference on Antennas and Propagation, EuCAP 2023., 189071, IEEE - Institute of Electrical and Electronics Engineers Inc., 17th European Conference on Antennas and Propagation, EuCAP 2023, Florence, Italy, 2023/03/26. https://doi.org/10.23919/EuCAP57121.2023.10133398

Effect of frequency and load on efficiency of inductive wireless power transfer systems. / Amaya Colina, Arianna Ginette; Kiong Lau, Buon; Swaans, Laurens et al.
17th European Conference on Antennas and Propagation, EuCAP 2023. IEEE - Institute of Electrical and Electronics Engineers Inc., 2023. 189071.

Research output: Chapter in Book/Report/Conference proceeding › Paper in conference proceeding › peer-review

TY - GEN

T1 - Effect of frequency and load on efficiency of inductive wireless power transfer systems

AU - Amaya Colina, Arianna Ginette

AU - Kiong Lau, Buon

AU - Swaans, Laurens

AU - Forsman, Mats

PY - 2023

Y1 - 2023

N2 - 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.

AB - 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.

KW - Inductive wireless power transfer

KW - optimal load

KW - power transfer efficiency

KW - resonant frequency

U2 - 10.23919/EuCAP57121.2023.10133398

DO - 10.23919/EuCAP57121.2023.10133398

M3 - Paper in conference proceeding

AN - SCOPUS:85162273387

BT - 17th European Conference on Antennas and Propagation, EuCAP 2023

PB - IEEE - Institute of Electrical and Electronics Engineers Inc.

T2 - 17th European Conference on Antennas and Propagation, EuCAP 2023

Y2 - 26 March 2023 through 31 March 2023

ER -

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

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Subject classification (UKÄ)

Free keywords

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