Abstract
In this paper, magnetic field emissions (MFE) from a 50 kW bipolar coil-based three-phase wireless charging system (WCS) is investigated. Then, a shield design is proposed to suppress the MFE below the safety limit identified by the International Commission of Non-Ionized Radiation Protection (ICNIRP) guidelines. Bipolar coil-based three-phase 3 WCSs provide extremely high power-density; therefore, the 3 WCSs are highly promising for high-power fast-wireless-charging of the electric vehicles. For the high-power EV application, it is a critical challenge to design a shield to suppress the MFE below the safety limit. The traditional aluminum shield is found ineffective for the bipolar 3-WCS. The proposed shield is designed with high-permeability magnetic material, i.e. ferrite, nanocrystalline material, etc. The proposed shield is simulated in finite element analysis (FEA) and the FEA results show that the proposed magnetic shield effectively suppresses the magnetic field emission below the ICNIRP limit. The generalized design of the proposed shield can be used for even higher power bipolar coil based WCSs.
| Original language | English |
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| Title of host publication | ECCE 2020 - IEEE Energy Conversion Congress and Exposition |
| Publisher | Institute of Electrical and Electronics Engineers Inc. |
| Pages | 842-849 |
| Number of pages | 8 |
| ISBN (Electronic) | 9781728158266 |
| DOIs | |
| State | Published - Oct 11 2020 |
| Event | 12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020 - Virtual, Detroit, United States Duration: Oct 11 2020 → Oct 15 2020 |
Publication series
| Name | ECCE 2020 - IEEE Energy Conversion Congress and Exposition |
|---|
Conference
| Conference | 12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020 |
|---|---|
| Country/Territory | United States |
| City | Virtual, Detroit |
| Period | 10/11/20 → 10/15/20 |
Funding
This research used the resources available at the Power Electronics and Electric Machinery Research Center at the National Transportation Research Center, a US Department of Energy (DOE) Office of Energy Efficiency and Renewable Energy user facility operated by Oak Ridge National Laboratory (ORNL). The authors would like to thank Dr. Burak Ozpineci (ORNL) and Dr. David Smith (ORNL) for their managerial support and technical guidance and Lee Slezak (DOE) for funding this work and project guidance. 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).
Keywords
- EMF
- Inductive charging
- electric vehicle
- leakage field
- shielding effectiveness.