Abstract
Ferrite cores are widely used in conventional wireless EV charging pads to reduce stray EMF emissions, but they can be brittle, heavy, and expensive. This work furthers the development of ferrite-less wireless charging pads by comparing an active and two distinct passive cancellation coil topologies as candidates to replace the ferrite. Using the software packages FEMM and MATLAB, each topology is optimized to find the best winding positions and radii to minimize leakage at a specified position under the side of the vehicle. The optimized designs are compared for shielding effectiveness, induced current, and efficiency. All three topologies are able to sufficiently reduce the leakage field below the ICNIRP limit of $27\ \mu\mathrm{T}_{\text{rms}}$ with just one turn. Interestingly, we find that an array of simple passive cancellation loops performs similar to the more widely studied passive cancellation coil.
Original language | English |
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Title of host publication | 2021 IEEE Transportation Electrification Conference and Expo, ITEC 2021 |
Publisher | Institute of Electrical and Electronics Engineers Inc. |
Pages | 771-775 |
Number of pages | 5 |
ISBN (Electronic) | 9781728175836 |
DOIs | |
State | Published - Jun 21 2021 |
Event | 2021 IEEE Transportation Electrification Conference and Expo, ITEC 2021 - Chicago, United States Duration: Jun 21 2021 → Jun 25 2021 |
Publication series
Name | 2021 IEEE Transportation Electrification Conference and Expo, ITEC 2021 |
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Conference
Conference | 2021 IEEE Transportation Electrification Conference and Expo, ITEC 2021 |
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Country/Territory | United States |
City | Chicago |
Period | 06/21/21 → 06/25/21 |
Funding
This manuscript has been authored by Oak Ridge National Laboratory, operated by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).