IEEE Power Electronics Magazine Compendium - March 2018 - 31

challenges are leakage fields, which for WPT are the magnetic,
B, and electric, E, fringe fields associated with HF magnetic
resonance power transfer. This issue is further complicated by
the fact that maximum B-fields are not necessarily colocated
with maximum E -fields [51]. ORNL researchers recognize the
issues associated with electromagnetic fields from cables carrying HF currents. This is why ORNL focused on energized
tracks of embedded roadway coils that are sequenced in synchronism with vehicle passage. The active fields remain strictly
beneath a vehicle that is charging. To mitigate the power pulsations inherent in coupling power from a series of embedded
coils, the ORNL team, in collaboration with ESL researchers,
installed high-power capacitors at both the grid and in vehicle.
The result was a dramatic reduction of 84% in charging current
to the vehicle battery and 81% from the grid connection. Using
electrochemical capacitors, such as Maxwell Technologies carbon UCs and the ESL LiC unit, it was demonstrated in an
experiment that peak currents associated with power peaks
were reduced to their average value. Similar results have been
found by others in experimental work on capacitor-battery
combinations [52], [53]. The benefit of power capacitors in
energy storage systems is a dramatic reduction of ripple current, which facilitates longer service life of the vehicle battery,
as validated by Argonne Laboratory researchers [54].

References
[1] G. A. Covic and J. T. Boys, "Modern trends in inductive power transfer for
transportation applications," IEEE J. Emerging Sel. Topics Power Electron.,
vol. 1, no. 1, pp. 28-41, Mar. 2013.
[2] O. C. Onar, S. Campbell, P. Ning, J. M. Miller, and Z. Liang, "Fabrication and evaluation of a high performance SiC inverter for wireless power
transfer applications," in Proc. 1st IEEE Workshop Wide Bandgap Power
Devices Applications, Columbus, OH, Oct. 27-29, 2013, pp. 125-130.
[3] J. M. Miller and O. C. Onar, "Wireless power transfer systems: Educational short course on wireless charging," in Proc. IEEE Transportation
Electrification Conf. Expo., Dearborn, MI, June 16, 2013.
[4] M. S. Chinthavali, O. C. Onar, J. M. Miller, and L. Tang, "Single-phase
active boost rectifier with power factor correction for Wireless Power
Transfer applications," in Proc. IEEE 5th Energy Conversion Congr. Expo.,
Denver, CO, Sept. 16-20, 2013, pp. 3258-3265.
[5] P. Ning, J. M. Miller, O. C. Onar, and C. P. White, "A compact wireless
charging system for electric vehicles," in Proc. IEEE 5th Energy Conversion
Congr. Expo., Denver, CO, Sept. 16-20, 2013, pp. 3629-3634.
[6] J. M. Miller, O. C. Onar, and P. T. Jones, "ORNL developments in stationary and dynamic wireless charging, special session: Advances in wireless
power for electric vehicles," in Proc. IEEE 5th Energy Conversion Congr.
Expo., Denver, CO, Sept. 16-20, 2013.
[7] M. Chinthavali, O. C. Onar, and J. M. Miller, "A power transfer system
with active rectification on the receiver side, " presented at the Conf. Electric Roads Vehicles, Park City, UT, Feb. 4-5, 2013.
[8] P. Ning, J. M. Miller, O. C. Onar, and C. P. White, "A compact wireless
charging system development," in Proc. IEEE Applied Power Electronics

Acknowledgments
The authors would like to thank the members of the ORNL
Power Electronics and Electric Machinery Group for their
contributions to WPT experimental fabrication, testing, and
data acquisition. The authors especially commend team
members P.T. Jones and Paul Chambon for their assistance
in vehicle systems aspects of this program.
This manuscript has been authored by UT-Battelle, LLC,
under Contract DE-AC05-00OR22725 with the U.S. Department of Energy.

Conf., Long Beach, CA, Mar. 17-21, 2013, pp. 3045-3050.
[9] O. C. Onar, J. M. Miller, S. L. Campbell, C. Coomer, C. P. White, and L.
E. Seiber, "A novel wireless power transfer for in-motion EV/PHEV charging," in Proc. IEEE Applied Power Electronics Conf., Long Beach, CA, Mar.
17-21, 2013, pp. 3073-3080.
[10] J. M. Miller, O. C. Onar, S. L. Campbell, C. Coomer, C. P. White, and L.
E. Seiber, "Oak Ridge National Laboratory wireless power transfer development for sustainable campus initiative," in Proc. IEEE Transportation Electrification Conf. Expo., Dearborn, MI, June 16, 2013, pp. 1-8.
[11] P. Ning, J. M. Miller, and O. C. Onar, "Genetic algorithm based coilsystem optimization for wireless power charging of electric vehicles," in
Proc. IEEE Transportation Electrification Conf. Expo., Dearborn, MI,

About the Authors
John M. Miller (jmmiller35@aol.com), distinguished staff,
Oak Ridge National Laboratory, Tennessee, is currently a principal engineer with JNJ Miller PLC, Oak Ridge, Tennessee.
Omer C. Onar (onaroc@ornl.gov), Weinberg Fellow, R&D
staff, is with Oak Ridge National Laboratory, Tennessee.
Cliff White (whitecp@ornl.gov), R&D staff, is with Oak
Ridge National Laboratory, Tennessee.
Steven Campbell (campbells@ornl.gov), R&D staff, is
with Oak Ridge National Laboratory, Tennessee.
Chester Coomer, R&D staff (retired), is with Oak Ridge
National Laboratory, Tennessee.
Larry Seiber (seiberl@ornl.gov), R&D staff, is with Oak
Ridge National Laboratory, Tennessee.
Raymond Sepe, Jr. (rsepe@electrostandards.com),
vice president for research and development, is with Electro Standards Laboratories, Cranston, Rhode Island.
Anton Steyerl (antons@lab.electrostandards.com),
research engineer, is with Electro Standards Laboratories, Cranston, Rhode Island.

June 16, 2013, pp. 1-5.
[12] J. M. Miller and O. C. Onar, "Oak Ridge National Laboratory in-motion
wireless power transfer system," in Proc. 1st Conf. Electric Roads Vehicles,
Park City, UT, Feb. 2012, pp. 1-11.
[13] J. M. Miller, C. P. White, O. C. Onar, and P. M. Ryan, "Grid side regulation of wireless power charging for plug-in electric vehicles," in Proc. IEEE
Energy Conversion Congr. Expo., Raleigh, NC, Sept. 2012, pp. 261-268.
[14] Y.-H. Chao, J.-J. Shieh, C.-T. Pan, W.-C. Shen, and M.-P. Chen, "A primaryside control strategy for series-parallel loosely coupled inductive power
transfer systems," in Proc. IEEE Conf. Industrial Electronics Applications,
Harbin, China, May 2007, pp. 2322-2327.
[15] Y.-H. Chao, J.-J. Shieh, C.-T. Pan, and W.-C. Shen, "A closed-form oriented compensator analysis for series-parallel loosely coupled inductive
power transfer systems," in Proc. IEEE Power Electronics Specialists Conf.,
Orlando, FL, June 17-21, 2007, pp. 1215-1220.
[16] H. L. Li, A. P. Hu, G. A. Covic, and C. Tang, "A new primary power
regulation method for contactless power transfer," in Proc. IEEE Int. Conf.
Industrial Technology, Gippsland, Australia, Feb. 2009, pp. 1-5.
[17] B. Sharp and H. Wu, "Asymmetrical voltage-cancellation control for
LCL resonant converters in inductive power transfer systems," in Proc.
IEEE Applied Power Electronics Conf., Long Beach, CA, Mar. 17-21, 2013,
pp. 661-666.

March 2014

z	IEEE PowEr ElEctronIcs MagazInE

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Table of Contents for the Digital Edition of IEEE Power Electronics Magazine Compendium - March 2018

Contents
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