Conformal Transformation Analysis of Capacitive Wireless Charging

This paper studies the capacitive coupling in a capacitive power transfer (CPT) system designed for charging applications. It proposes mathematical models using the conformal transformation for calculating air-gapped and underwater capacitance and verifies the proposed models using COMSOL multiphysi...

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Bibliographic Details
Published in:IEEE access 2022, Vol.10, p.105621-105630
Main Authors: Mahdi, Hussein, Hoff, Bjarte, Ellingsen, Pal Gunnar, Ostrem, Trond
Format: Article
Language:English
Subjects:
Atmospheric modeling
Capacitance
capacitive power transfer
Conformal mapping
Couplers
Couplings
Cross coupling
Electric fields
Electrodes
Energy efficiency
Finite element analysis
Mathematical models
network theory
Seawater
Self-organizing feature maps
Wireless power transmission
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Summary:This paper studies the capacitive coupling in a capacitive power transfer (CPT) system designed for charging applications. It proposes mathematical models using the conformal transformation for calculating air-gapped and underwater capacitance and verifies the proposed models using COMSOL multiphysics and measurements. The measured results show that we can achieve nano-farad capacitance ranges if we submerge the capacitor in seawater. The seawater's capacitance slightly changes when we increase the gap distance or the operating frequency. As the under seawater CPT system can be an attractive option for loosely-coupled charging applications, we further examine the system by focusing on the cross-coupling effects. The results show that the cross-coupling between the plate degrades the system's power transfer capability and efficiency. With negligible cross-coupling effects, the system gives 129 W output power at an efficiency of 81.2%.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2022.3210960