Frequency-Splitting Analysis of Four-Coil Resonant Wireless Power Transfer

Based on four-coil magnetically coupled resonant wireless power transfer, this paper demonstrates, explains, and analyzes the frequency-splitting phenomenon by using the circuit theory. First, the complete and simplified models are built to describe the whole system. The numerical formulas of the system efficiency both at and away from the resonant frequency are presented. Then the frequency-splitting phenomenon is displayed and further explained mathematically and physically. An important factor for frequency splitting is introduced. The boundary condition for frequency splitting and its splitting frequency points are deduced. The amplitude-frequency and phase-frequency characteristics of the input impedance are measured and described to verify the explanation. Three related factors are studied, and the sensitivity analysis is conducted. A solution is proposed that helps improve the efficiency when frequency splitting occurs. The theoretical calculations and experimental results provide a sound basis.

[1]  Gianluca Lazzi,et al.  On the Design of Efficient Multi-Coil Telemetry System for Biomedical Implants , 2013, IEEE Transactions on Biomedical Circuits and Systems.

[2]  Zhengming Zhao,et al.  Frequency splitting analysis of magnetically-coupled resonant wireless power transfer , 2013, 2013 IEEE Energy Conversion Congress and Exposition.

[3]  Sangwook Nam,et al.  Investigation of Adaptive Matching Methods for Near-Field Wireless Power Transfer , 2011, IEEE Transactions on Antennas and Propagation.

[4]  Ulrich Jumar,et al.  Design Methodology for High Efficient Inductive Power Transfer Systems With High Coil Positioning Flexibility , 2013, IEEE Transactions on Industrial Electronics.

[5]  Aiguo Patrick Hu,et al.  Steady state analysis of a capacitively coupled contactless power transfer system , 2009, 2009 IEEE Energy Conversion Congress and Exposition.

[6]  G. Lazzi,et al.  Multicoil Telemetry System for Compensation of Coil Misalignment Effects in Implantable Systems , 2012, IEEE Antennas and Wireless Propagation Letters.

[7]  Wenxing Zhong,et al.  A Critical Review of Recent Progress in Mid-Range Wireless Power Transfer , 2014, IEEE Transactions on Power Electronics.

[8]  David S. Ricketts,et al.  Experimental demonstration of the equivalence of inductive and strongly coupled magnetic resonance wireless power transfer , 2013 .

[9]  S.C. Goldstein,et al.  Magnetic Resonant Coupling As a Potential Means for Wireless Power Transfer to Multiple Small Receivers , 2009, IEEE Transactions on Power Electronics.

[10]  Pavol Bauer,et al.  Control Method for Wireless Inductive Energy Transfer Systems With Relatively Large Air Gap , 2013, IEEE Transactions on Industrial Electronics.

[11]  Jong-Moo Lee,et al.  Circuit-Model-Based Analysis of a Wireless Energy-Transfer System via Coupled Magnetic Resonances , 2011, IEEE Transactions on Industrial Electronics.

[12]  Zhengming Zhao,et al.  Frequency Decrease Analysis of Resonant Wireless Power Transfer , 2014, IEEE Transactions on Power Electronics.

[13]  Songcheol Hong,et al.  A Study on Magnetic Field Repeater in Wireless Power Transfer , 2013, IEEE Transactions on Industrial Electronics.

[14]  Y. Perriard,et al.  Design of a Contactless Energy-Transfer System for Desktop Peripherals , 2011, IEEE Transactions on Industry Applications.

[15]  Takehiro Imura,et al.  Impedance Matching and Power Division Using Impedance Inverter for Wireless Power Transfer via Magnetic Resonant Coupling , 2014, IEEE Transactions on Industry Applications.

[16]  Chih-Jung Chen,et al.  A Study of Loosely Coupled Coils for Wireless Power Transfer , 2010, IEEE Transactions on Circuits and Systems II: Express Briefs.

[17]  Seungyoung Ahn,et al.  Analytical expressions for maximum transferred power in wireless power transfer systems , 2011, 2011 IEEE International Symposium on Electromagnetic Compatibility.

[18]  Maysam Ghovanloo,et al.  The Circuit Theory Behind Coupled-Mode Magnetic Resonance-Based Wireless Power Transmission , 2012, IEEE Transactions on Circuits and Systems I: Regular Papers.

[19]  マチアス ウェクリン,et al.  Apparatus for transmitting electrical energy inductively , 2003 .

[20]  Takehiro Imura,et al.  Maximizing Air Gap and Efficiency of Magnetic Resonant Coupling for Wireless Power Transfer Using Equivalent Circuit and Neumann Formula , 2011, IEEE Transactions on Industrial Electronics.

[21]  W. Marsden.  I and J , 2012 .

[22]  Shahriar Mirabbasi,et al.  Design and Optimization of Resonance-Based Efficient Wireless Power Delivery Systems for Biomedical Implants , 2011, IEEE Transactions on Biomedical Circuits and Systems.

[23]  R. D. Lorenz,et al.  Development and Validation of Model for 95%-Efficiency 220-W Wireless Power Transfer Over a 30-cm Air Gap , 2011, IEEE Transactions on Industry Applications.

[24]  T. P. Duong,et al.  Experimental Results of High-Efficiency Resonant Coupling Wireless Power Transfer Using a Variable Coupling Method , 2011, IEEE Microwave and Wireless Components Letters.

[25]  Yong-Hae Kim,et al.  Optimization of wireless power transmission through resonant coupling , 2010 .

[26]  T. Mizuno,et al.  Improvement in Efficiency of Wireless Power Transfer of Magnetic Resonant Coupling Using Magnetoplated Wire , 2011, IEEE Transactions on Magnetics.

[27]  G. Franceschetti,et al.  Wireless Power Transmission. A new science is borne , 2012, 2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications.

[28]  Y. Hori,et al.  Basic study of improving efficiency of wireless power transfer via magnetic resonance coupling based on impedance matching , 2010, 2010 IEEE International Symposium on Industrial Electronics.

[29]  M. M. Tentzeris,et al.  Optimal Design Parameters for Wireless Power Transfer by Resonance Magnetic , 2012, IEEE Antennas and Wireless Propagation Letters.

[30]  Rahul Sarpeshkar,et al.  Feedback Analysis and Design of RF Power Links for Low-Power Bionic Systems , 2007, IEEE Transactions on Biomedical Circuits and Systems.

[31]  Grant A. Covic,et al.  LCL Pickup Circulating Current Controller for Inductive Power Transfer Systems , 2013, IEEE Transactions on Power Electronics.

[32]  Mingui Sun,et al.  A Comparative Study Between Novel Witricity and Traditional Inductive Magnetic Coupling in Wireless Charging , 2011, IEEE Transactions on Magnetics.

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

[34]  Robert D. Lorenz,et al.  Development and validation of model for 95% efficiency, 220 W wireless power transfer over a 30cm air-gap , 2010, 2010 IEEE Energy Conversion Congress and Exposition.

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

[36]  Jong-Won Yu,et al.  Contactless Energy Transfer Systems Using Antiparallel Resonant Loops , 2013, IEEE Transactions on Industrial Electronics.