Analysis and experimental results of frequency splitting of underwater wireless power transfer

Wangqiang Niu; Wei Gu; Jianxin Chu

Analysis and experimental results of frequency splitting of underwater wireless power transfer

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Author(s): Wangqiang Niu¹ ; Wei Gu¹ ; Jianxin Chu¹
- Affiliations: 1: Key Laboratory of Marine Technology and Control Engineering , Ministry of Communications, PRC, Shanghai Maritime University , Shanghai 201306 , People's Republic of China
Source: Volume 2017, Issue 7, July 2017, p. 385 – 390
DOI: 10.1049/joe.2017.0194 , Online ISSN 2051-3305

This is an open access article published by the IET under the Creative Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)

Received 17/05/2017, Accepted 25/05/2017, Published 02/06/2017

Underwater wireless power transfer (UWPT) is an important technique to power underwater devices while its frequency splitting phenomena are not fully elucidated. In this study, frequency splitting phenomena of a symmetrical planar two-coil wireless power transfer (WPT) system resonated at 90 kHz are investigated in seawater and freshwater. A concise frequency splitting analysis of this WPT system in air based on circuit model is given first and then experimental data are reported to show there is little difference between power transfer in air, freshwater and seawater in the range of 40–140 kHz of this WPT system. Consequently, the frequency splitting analysis and observations in air are also applicable in freshwater and seawater. It is found a V-type frequency splitting pattern exists in this WPT system under seawater and freshwater. Frequency shift is observed in this UWPT system in overcoupled region, and no frequency shift is observed in undercoupled region. In undercoupled region, in the low frequency zone of 40–90 kHz the load voltage characteristics in three media are identical; in the high-frequency zone of 90–140 kHz, the load voltage in air is slightly larger than those in freshwater and seawater.

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Analysis and experimental results of frequency splitting of underwater wireless power transfer

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