Influences of Coil Radius on Effective Transfer Distance in WPT System

The improvement of effective transfer distance is significant for wireless power transfer (WPT) via coupled magnetic resonances, with coil radius being the most important influencing factor. To study the relationship between effective transfer distance and coil radius, a model of WPT is established at first. Based on analyses of circuit and magnetic field, the influencing factors for effective transfer distance are obtained. Second, the models of WPT are constructed using software COMSOL, and the influences of Tx and Rx coil radius on the effective transfer distance are studied in detail. In addition, they are not proportional and the coil impedance is the most important factor. On this basis, a coil design method is proposed. Finally, an experiment device was built, and experimental results were well consistent with the theoretical analysis, showing the rationality and effectiveness of the proposed method.

[1]  Bang-Jun Che,et al.  A Method of Using Nonidentical Resonant Coils for Frequency Splitting Elimination in Wireless Power Transfer , 2015, IEEE Transactions on Power Electronics.

[2]  B. Zhang,et al.  Frequency, Impedance Characteristics and HF Converters of Two-Coil and Four-Coil Wireless Power Transfer , 2015, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[3]  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.

[4]  Zicheng Bi,et al.  A review of wireless power transfer for electric vehicles: Prospects to enhance sustainable mobility , 2016 .

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

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

[7]  Khai D. T. Ngo,et al.  Systematic Design of Coils in Series–Series Inductive Power Transfer for Power Transferability and Efficiency , 2018, IEEE Transactions on Power Electronics.

[8]  Young-Jin Park,et al.  Optimization and Design of Small Circular Coils in a Magnetically Coupled Wireless Power Transfer System in the Megahertz Frequency , 2016, IEEE Transactions on Microwave Theory and Techniques.

[9]  Bruno Clerckx,et al.  Communications and Signals Design for Wireless Power Transmission , 2016, IEEE Transactions on Communications.

[10]  Chee Yen Leow,et al.  Low-power near-field magnetic wireless energy transfer links: A review of architectures and design approaches , 2017 .

[11]  Zhu Han,et al.  Wireless Charging Technologies: Fundamentals, Standards, and Network Applications , 2015, IEEE Communications Surveys & Tutorials.

[12]  Ji-Woong Choi,et al.  Review of Near-Field Wireless Power and Communication for Biomedical Applications , 2017, IEEE Access.

[13]  Zhijian Fang,et al.  Accurate Maximum Power Tracking of Wireless Power Transfer System Based on Simulated Annealing Algorithm , 2018, IEEE Access.

[14]  G. Park,et al.  Analysis of the Resonance Characteristics by a Variation of Coil Distance in Magnetic Resonant Wireless Power Transmission , 2018, IEEE Transactions on Magnetics.

[15]  Jun Li,et al.  Simultaneous Wireless Information and Power Transfer (SWIPT): Recent Advances and Future Challenges , 2018, IEEE Communications Surveys & Tutorials.

[16]  Aiguo Patrick Hu,et al.  Maximum Efficiency Tracking for Wireless Power Transfer Systems With Dynamic Coupling Coefficient Estimation , 2018, IEEE Transactions on Power Electronics.

[17]  Gun-Woo Moon,et al.  Wireless Power Transfer System With an Asymmetric Four-Coil Resonator for Electric Vehicle Battery Chargers , 2016, IEEE Transactions on Power Electronics.

[18]  J. Yook,et al.  Asymmetric Coil Structures for Highly Efficient Wireless Power Transfer Systems , 2018, IEEE Transactions on Microwave Theory and Techniques.

[19]  M. Soljačić,et al.  Efficient wireless non-radiative mid-range energy transfer , 2006, physics/0611063.

[20]  Shanhui Fan,et al.  Robust wireless power transfer using a nonlinear parity–time-symmetric circuit , 2017, Nature.

[21]  Robert D. Lorenz,et al.  Achieving Low Magnetic Flux Density and Low Electric Field Intensity for a Loosely Coupled Inductive Wireless Power Transfer System , 2018, IEEE Transactions on Industry Applications.

[22]  Qingxin Yang,et al.  An Automatic Impedance Matching Method Based on the Feedforward-Backpropagation Neural Network for a WPT System , 2019, IEEE Transactions on Industrial Electronics.

[23]  C.M. Zierhofer,et al.  Geometric approach for coupling enhancement of magnetically coupled coils , 1996, IEEE Transactions on Biomedical Engineering.

[24]  Woojin Choi,et al.  Design of a High-Efficiency Wireless Power Transfer System With Intermediate Coils for the On-Board Chargers of Electric Vehicles , 2018, IEEE Transactions on Power Electronics.

[25]  Ji Zhou,et al.  Poynting vector analysis for wireless power transfer between magnetically coupled coils with different loads , 2017, Scientific Reports.

[26]  G. Buja,et al.  Design and experimentation of two-coil coupling for electric city-car WPT charging , 2016 .