Design of auto-tuning capacitive power transfer system for wireless power transfer

ABSTRACT This paper presents the design of capacitive wireless power transfer systems based on a Class-E inverter approach. The main reason for adopting the Class-E inverter approach is because of its high efficiency, theoretically 100%. However, the operation of a Class-E inverter is highly sensitive to its circuit’s parameters. In a typical capacitive wireless power transfer application, the capacitive coupling distance between plates is subject to changes, and hence its power transfer efficiency is greatly affected if the Class-E inverter is properly tuned. This drawback motivates us to develop an auto frequency tuning algorithm for a Class-E inverter which maintains its power transfer efficiency in spite of the variations of capacitive coupling distances between plates and circuit’s parameters. Finally, simulation and experiment are carried out to verify the effectiveness of the auto frequency tuning algorithm.

[1]  Hiroo Sekiya,et al.  Inductively coupled wireless power transfer with class-E2 DC-DC converter , 2013, 2013 European Conference on Circuit Theory and Design (ECCTD).

[2]  Marian K. Kazimierczuk,et al.  Exact analysis of class E tuned power amplifier at any Q and switch duty cycle , 1987 .

[3]  James F. Whidborne,et al.  Wireless Power Transfer Using Class E Inverter With Saturable DC-Feed Inductor , 2014, IEEE Transactions on Industry Applications.

[4]  Marian K. Kazimierczuk,et al.  Power losses and efficiency of class-E power amplifier at any duty ratio , 2004, IEEE Transactions on Circuits and Systems I: Regular Papers.

[5]  Mitchell Kline.  Capacitive Power Transfer , 2010 .

[6]  Jenshan Lin,et al.  A Loosely Coupled Planar Wireless Power System for Multiple Receivers , 2009, IEEE Transactions on Industrial 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]  David Paul Kimber.  Class E amplifiers and their modulation behaviour , 2006 .

[9]  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.

[10]  Sanghoek Kim,et al.  Wireless Power Transfer to Miniature Implants: Transmitter Optimization , 2012, IEEE Transactions on Antennas and Propagation.

[11]  Hiroo Sekiya,et al.  MOSFET parasitic capacitance effects to class-DE power amplifier , 2013, 2013 IEEE Electrical Design of Advanced Packaging Systems Symposium (EDAPS).

[12]  Babak Ziaie,et al.  A self-oscillating detuning-insensitive class-E transmitter for implantable microsystems , 2001, IEEE Transactions on Biomedical Engineering.

[13]  Denis Flandre,et al.  A Self-Tuning Inductive Powering System for Biomedical Implants , 2011 .

[14]  Anthony N. Laskovski,et al.  Biomedical Engineering, Trends in Electronics, Communications and Software , 2011 .

[15]  M.K. Kazimierczuk,et al.  Analysis of sub-optimum operation of class E amplifier , 2003, 2003 46th Midwest Symposium on Circuits and Systems.

[16]  Robert Puers,et al.  Automatic inductance compensation for class E driven flexible coils , 2008 .

[17]  Mehmet Rasit Yuce,et al.  Power Amplifiers for Electronic Bio-Implants , 2011 .

[18]  Jenshan Lin,et al.  Design and Optimization of a Class-E Amplifier for a Loosely Coupled Planar Wireless Power System , 2009, IEEE Transactions on Circuits and Systems II: Express Briefs.

[19]  Tadashi Suetsugu,et al.  Analysis and design of class E amplifier with shunt capacitance composed of nonlinear and linear capacitances , 2004, IEEE Transactions on Circuits and Systems I: Regular Papers.