Quasistatic Approximation for Exposure Assessment of Wireless Power Transfer

• LAAKSO Ilkka

  Department of Computer Science and Engineering, Nagoya Institute of Technology

• SHIMAMOTO Takuya

  Department of Computer Science and Engineering, Nagoya Institute of Technology

• HIRATA Akimasa

  Department of Computer Science and Engineering, Nagoya Institute of Technology

• FELIZIANI Mauro

  Dept. of Electrical and Computer Engineering, University of L'Aquila

Abstract

Magnetic resonant coupling between two coils allows effective wireless transfer of power over distances in the range of tens of centimeters to a few meters. The strong resonant magnetic field also extends to the immediate surroundings of the power transfer system. When a user or bystander is exposed to this magnetic field, electric fields are induced in the body. For the purposes of human and product safety, it is necessary to evaluate whether these fields satisfy the human exposure limits specified in international guidelines and standards. This work investigates the effectiveness of the quasistatic approximation for computational modeling human exposure to the magnetic fields of wireless power transfer systems. It is shown that, when valid, this approximation can greatly reduce the computational requirements of the assessment of human exposure. Using the quasistatic modeling approach, we present an example of the assessment of human exposure to the non-uniform magnetic field of a realistic WPT system for wireless charging of an electric vehicle battery, and propose a coupling factor for practical determination of compliance with the international exposure standards.

Journal

• IEICE Transactions on Communications

  IEICE Transactions on Communications E98.B (7), 1156-1163, 2015

  The Institute of Electronics, Information and Communication Engineers

Keywords

• wireless power transfer
• human exposure
• dosimetry

Details

• CRID: 1390001204375199872
• NII Article ID: 130005085027
• DOI: 10.1587/transcom.e98.b.1156
• ISSN: 17451345
• ISSN: 09168516
• Web Site: https://www.jstage.jst.go.jp/article/transcom/E98.B/7/E98.B_1156/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed