Multi sub-coil flux pipe couplers and their use in a misalignment-adaptive wireless power transfer system

ABSTRACT Flux pipe couplers are compact coils used in wireless power transfer (WPT) applications. The first part of this paper investigates the effect number of sub-coils on the magnetic characteristics. Flux pipe couplers with more than two sub-coils exhibit higher coupling coefficient as compared to traditional flux pipe couplers with two sub-coils. Furthermore, multi sub-coil flux pipe couplers better distribute the magnetic flux inside the core, making them attractive in high power applications. The second part presents an experimental WPT system employing multi sub-coil flux pipe couplers with three sub-coils. More than 82% power transfer efficiency is observed when couplers are separated with 100 mm vertical gap. Lateral misalignments up to 200 mm are then applied, and meantime, the separation between sub-coils is varied for achieving maximum efficiency. A near-constant efficiency is obtained up to 150 mm misalignment. Therefore, this paper announces another potential use of flux pipe couplers realizing an adaptive WPT system.

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

[2]  Takehiro Imura,et al.  Basic experimental study on helical antennas of wireless power transfer for Electric Vehicles by using magnetic resonant couplings , 2009, 2009 IEEE Vehicle Power and Propulsion Conference.

[3]  John Boys,et al.  A new IPT magnetic coupler for electric vehicle charging systems , 2010, IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society.

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

[5]  Grant A. Covic,et al.  A bipolar primary pad topology for EV stationary charging and highway power by inductive coupling , 2011, 2011 IEEE Energy Conversion Congress and Exposition.

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

[7]  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.

[8]  Yasuyoshi Kaneko,et al.  Small-size light-weight transformer with new core structure for contactless electric vehicle power transfer system , 2011, 2011 IEEE Energy Conversion Congress and Exposition.

[9]  Nam Yoon Kim,et al.  Automated frequency tracking system for efficient mid‐range magnetic resonance wireless power transfer , 2012 .

[10]  Qiang Wei,et al.  A New Type of IPT System with Large Lateral Tolerance and its Circuit Analysis , 2012, 2012 International Conference on Connected Vehicles and Expo (ICCVE).

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

[12]  Anthony Grbic,et al.  Comprehensive Analysis and Measurement of Frequency-Tuned and Impedance-Tuned Wireless Non-Radiative Power-Transfer Systems , 2014, IEEE Antennas and Propagation Magazine.

[13]  Zhiping Yu,et al.  Effects of coil shapes on wireless power transfer via magnetic resonance coupling , 2014 .

[14]  Jongsun Park,et al.  An Adaptive Impedance-Matching Network Based on a Novel Capacitor Matrix for Wireless Power Transfer , 2014, IEEE Transactions on Power Electronics.

[15]  Omer C. Onar,et al.  Primary-Side Power Flow Control of Wireless Power Transfer for Electric Vehicle Charging , 2015, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[16]  Fang Li,et al.  Improving the Misalignment Tolerance of Wireless Charging System by Optimizing the Compensate Capacitor , 2015, IEEE Transactions on Industrial Electronics.

[17]  Chunting Chris Mi,et al.  Wireless Power Transfer for Electric Vehicle Applications , 2015, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[18]  Jong-Wook Lee,et al.  A Dynamically Adaptable Impedance-Matching System for Midrange Wireless Power Transfer with Misalignment , 2015 .

[19]  Zhou Jing,et al.  Automatic Frequency Tuning with Power-Level Tracking System for Wireless Charging of Electric Vehicles , 2016 .

[20]  Jing Zhou,et al.  Automatic Frequency Tuning with Power-Level Tracking System for Wireless Charging of Electric Vehicles , 2016, 2016 IEEE Vehicle Power and Propulsion Conference (VPPC).

[21]  Sabri Bicakci,et al.  A resonance frequency tracker and source frequency tuner for inductively coupled wireless power transfer systems , 2016, 2016 46th European Microwave Conference (EuMC).

[22]  S. A. Sis.  A Circuit Model-Based Analysis of Magnetically Coupled Resonant Loops in Wireless Power Transfer Systems , 2018, Electrica.

[23]  Giuseppe Buja,et al.  Analysis and design of DD coupler for dynamic wireless charging of electric vehicles , 2018 .

[24]  Selçuk Kavut,et al.  A frequency-tuned magnetic resonance-based wireless power transfer system with near-constant efficiency up to 24 cm distance , 2018, Turkish J. Electr. Eng. Comput. Sci..

[25]  Seyit Ahmet Sis,et al.  A Cross-Shape Coil Structure for Use in Wireless Power Applications , 2018 .