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

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.

[1]  Naoto Wakatsuki,et al.  Wireless power and data transfer system for station-based autonomous underwater vehicles , 2015, OCEANS 2015 - MTS/IEEE Washington.

[2]  T. Matsumoto,et al.  Power Feeding and Data-Transmission System Using Magnetic Coupling for an Ocean Observation Mooring Buoy , 2007, IEEE Transactions on Magnetics.

[3]  M. Soljačić,et al.  Wireless Power Transfer via Strongly Coupled Magnetic Resonances , 2007, Science.

[4]  Paolo Dario,et al.  Autonomous Underwater Biorobots: A Wireless System for Power Transfer , 2013, IEEE Robotics & Automation Magazine.

[5]  H. Fukuda,et al.  New concept of an electromagnetic usage for contactless communication and power transmission in the ocean , 2013, 2013 IEEE International Underwater Technology Symposium (UT).

[6]  Ikuo Awai,et al.  Choice of resonators for a WPT system in lossy materials , 2014, 2014 IEEE Wireless Power Transfer Conference.

[7]  Mahmoud Shahabadi,et al.  Investigation of electric and magnetic coupling between two helical resonators of a wireless power transfer system , 2016 .

[8]  Ying Chen,et al.  Frequency selection of an inductive contactless power transmission system for ocean observing , 2013 .

[9]  Alanson P. Sample,et al.  Analysis , Experimental Results , and Range Adaptation of Magnetically Coupled Resonators for Wireless Power Transfer , 2010 .

[10]  Mauro Mongiardo,et al.  Rigorous Network and Full-Wave Electromagnetic Modeling of Wireless Power Transfer Links , 2015, IEEE Transactions on Microwave Theory and Techniques.

[11]  Tamaki Ura,et al.  Noncontact power supply for seafloor geodetic observing robot system , 2007 .

[12]  Chulwoo Kim,et al.  Adaptive frequency with power-level tracking system for efficient magnetic resonance wireless power transfer , 2012 .

[13]  Kai Song,et al.  Design and Loss Analysis of Loosely Coupled Transformer for an Underwater High-Power Inductive Power Transfer System , 2015, IEEE Transactions on Magnetics.

[14]  Marc Caesar R. Talampas,et al.  Development and evaluation of simultaneous wireless transmission of power and data for oceanographic devices , 2011 .

[15]  Wangqiang Niu,et al.  Frequency splitting patterns in wireless power relay transfer , 2014, IET Circuits Devices Syst..

[16]  Wenan Li,et al.  Frequency-Splitting-Free Synchronous Tuning of Close-Coupling Self-Oscillating Wireless Power Transfer , 2016 .

[17]  Wangqiang Niu,et al.  Coupled-mode analysis of frequency splitting phenomena in CPT systems , 2012 .

[18]  Wangqiang Niu,et al.  Frequency splitting of underwater wireless power transfer , 2016, 2016 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM).

[19]  Wangqiang Niu,et al.  Exact Analysis of Frequency Splitting Phenomena of Contactless Power Transfer Systems , 2013, IEEE Transactions on Circuits and Systems I: Regular Papers.

[20]  G. A. Ramadass,et al.  Analysis of Subsea Inductive Power Transfer Performances Using Planar Coils , 2016 .

[21]  Ikuo Awai,et al.  Wireless power transfer to moving ornamental robot fish in aquarium , 2014, 2014 IEEE 3rd Global Conference on Consumer Electronics (GCCE).

[22]  H. M. Santos,et al.  Simulation and experimental evaluation of a resonant magnetic wireless power transfer system for seawater operation , 2016, OCEANS 2016 - Shanghai.

[23]  G. Doerk,et al.  Bit-Patterned Magnetic Recording: Theory, Media Fabrication, and Recording Performance , 2015, IEEE Transactions on Magnetics.

[24]  Aiguo Patrick Hu,et al.  Optimal coupling condition of IPT system for achieving maximum power transfer , 2009 .

[25]  Kevin Lin,et al.  Underwater wireless power transfer , 2015, 2015 IEEE Wireless Power Transfer Conference (WPTC).

[26]  John D. Rockway,et al.  Underwater wireless power transfer for maritime applications , 2015, 2015 IEEE Wireless Power Transfer Conference (WPTC).