Efficiency Analysis of S-S Resonant Wireless Power Transfer Systems: Impacts of Coupling Coefficient, Q-Factor, and Equivalent Series Resistance

DOI

10.2991/978-94-6463-821-9_111How to use a DOI?

Keywords

Wireless Power Transfer(WPT); Series-Series Resonance Quality; Factor(Q-Factor); Frequency; Coupling Coefficient (k); ESR

Abstract

This paper presents a comprehensive analysis of Series-Series (S-S) resonant wireless power transfer (WPT) systems through rigorous theoretical modelling, MATLAB simulations, and parametric studies. By deriving key equations for input impedance, output power, efficiency, and reflected resistance, we establish a framework to optimize system performance. The relationships between quality factor (Q) and frequency (f), coupling coefficient (k) and reflected resistance (Rr​), and equivalent series resistance (ESR) and frequency are systematically explored. Simulation results validate the theoretical predictions, demonstrating that Q peaks at f_peak = 85 kHz​, while ESR increases with frequency due to the skin effect. Optimal coupling (k = 0.25) is identified to maximize efficiency under varying load conditions. This work not only bridges theoretical derivations with practical design considerations but also provides actionable insights for developing high-efficiency WPT systems in dynamic environments, such as EV charging pads and industrial wireless power solutions. By quantifying the interdependencies between Q, k, and ESR, the study enables engineers to prioritize parameter tuning for specific applications, balancing robustness and energy transfer performance.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Zhuo’er Wang
PY  - 2025
DA  - 2025/08/31
TI  - Efficiency Analysis of S-S Resonant Wireless Power Transfer Systems: Impacts of Coupling Coefficient, Q-Factor, and Equivalent Series Resistance
BT  - Proceedings of the 2025 2nd International Conference on Mechanics, Electronics Engineering and Automation (ICMEEA 2025)
PB  - Atlantis Press
SP  - 1168
EP  - 1179
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-821-9_111
DO  - 10.2991/978-94-6463-821-9_111
ID  - Wang2025
ER  -