Coil enhancements for high efficiency wireless power transfer applications

Achieving high efficiency with improved power transfer range and misalignment tolerance is the major design challenge in realizing Wireless Power Transfer (WPT) systems for industrial applications. Resonant coils must be carefully designed to achieve highest possible system performance by fully utilizing the available space. High quality factor and enhanced electromagnetic coupling are key indices which determine the system performance. In this paper, design parameter extraction and quality factor optimization of multi layered helical coils are presented using finite element analysis (FEA) simulations. In addition, a novel Toroidal Shaped Spiral (TSS) coil is proposed to increase power transfer range and misalignment tolerance. The proposed shapes and recommendations can be used to design high efficiency WPT resonator in a limited space.

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

[2]  Grant Covic,et al.  Power transfer capability and bifurcation phenomena of loosely coupled inductive power transfer systems , 2004, IEEE Transactions on Industrial Electronics.

[3]  Grant Covic,et al.  Development of a Single-Sided Flux Magnetic Coupler for Electric Vehicle IPT Charging Systems , 2013, IEEE Transactions on Industrial Electronics.

[4]  Anthony Grbic,et al.  A Power Link Study of Wireless Non-Radiative Power Transfer Systems Using Resonant Shielded Loops , 2012, IEEE Transactions on Circuits and Systems I: Regular Papers.

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

[6]  Zhengming Zhao,et al.  Analysis of the Double-Layer Printed Spiral Coil for Wireless Power Transfer , 2013, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[7]  Minkyu Je,et al.  High-Efficiency Wireless Power Transfer for Biomedical Implants by Optimal Resonant Load Transformation , 2013, IEEE Transactions on Circuits and Systems I: Regular Papers.

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

[9]  R. D. Lorenz,et al.  Surface spiral coil design methodologies for high efficiency, high power, low flux density, large air-gap wireless power transfer systems , 2013, 2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[10]  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.

[11]  J. T. Boys,et al.  Design and Optimization of Circular Magnetic Structures for Lumped Inductive Power Transfer Systems , 2011, IEEE Transactions on Power Electronics.

[12]  Bingnan Wang,et al.  Wireless power transfer with metamaterials , 2011, Proceedings of the 5th European Conference on Antennas and Propagation (EUCAP).

[13]  Wenxing Zhong,et al.  General Analysis on the Use of Tesla's Resonators in Domino Forms for Wireless Power Transfer , 2013, IEEE Transactions on Industrial Electronics.

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

[15]  Takehiro Imura,et al.  Automated Impedance Matching System for Robust Wireless Power Transfer via Magnetic Resonance Coupling , 2013, IEEE Transactions on Industrial Electronics.

[16]  Songcheol Hong,et al.  Effect of Coupling Between Multiple Transmitters or Multiple Receivers on Wireless Power Transfer , 2013, IEEE Transactions on Industrial Electronics.

[17]  J. Itoh,et al.  Proposal of Switched-mode Matching Circuit in power supply for wireless power transfer using magnetic resonance coupling , 2012, 2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC).