Simple design approach for asymmetric resonant inductive coupled WPT systems using J-inverters

This paper presents a simple and precise design method for asymmetric resonant inductive coupled wireless power transfer (WPT) systems without the involvement of circuit or electromagnetic (EM) simulators. The design method is based on the generalized second-order band-pass filter (BPF). First, the values of the BPF's J-inverters are computed based on the mutual coupling between the transmitter (TX) and the receiver (RX). Then, the required components are extracted from the J-inverters values. We achieved good agreements between the analytical design procedure, the circuit and the EM simulations, and the measurements. The measured efficiency is 75% at a transmission distance of 38 mm, and the sizes of the TX and RX are 50×50 mm2 and 30×30 mm2, respectively.

[1]  Stephen P. Boyd,et al.  Simple accurate expressions for planar spiral inductances , 1999, IEEE J. Solid State Circuits.

[2]  Seung-Ok Lim,et al.  Wireless Power Transfer System Adaptive to Change in Coil Separation , 2014, IEEE Transactions on Antennas and Propagation.

[3]  Jenshan Lin,et al.  Design and Test of a High-Power High-Efficiency Loosely Coupled Planar Wireless Power Transfer System , 2009, IEEE Transactions on Industrial Electronics.

[4]  M. Mohammadi Falavarjani,et al.  Design and implementation of compact WPT system using printed spiral resonators , 2014 .

[5]  E. M. Jones,et al.  Microwave Filters, Impedance-Matching Networks, and Coupling Structures , 1980 .

[6]  Zhizhang Chen,et al.  A Planar Magnetically Coupled Resonant Wireless Power Transfer System Using Printed Spiral Coils , 2014, IEEE Antennas and Wireless Propagation Letters.

[7]  Mansun Chan,et al.  Modeling of Mutual Coupling Between Planar Inductors in Wireless Power Applications , 2014, IEEE Transactions on Power Electronics.

[8]  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.

[9]  N. M. Ibrahim,et al.  Analysis of current crowding effects in multiturn spiral inductors , 2001 .

[10]  Sherif Hekal,et al.  New compact design for short range wireless power transmission at 1GHz using H-slot resonators , 2015, 2015 9th European Conference on Antennas and Propagation (EuCAP).

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

[12]  Aiguo Patrick Hu,et al.  Modelling and analysis of a capacitively coupled contactless power transfer system , 2011 .

[13]  Seung-Ok Lim,et al.  Impedance-Matched Wireless Power Transfer Systems Using an Arbitrary Number of Coils With Flexible Coil Positioning , 2014, IEEE Antennas and Wireless Propagation Letters.

[14]  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.

[15]  Ramesh K. Pokharel,et al.  Compact Wireless Power Transfer System Using Defected Ground Bandstop Filters , 2016, IEEE Microwave and Wireless Components Letters.