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Human Exposure to Electromagnetic Fields from Parallel Wireless Power Transfer Systems.

Feng Wen1, Xueliang Huang2

  • 1School of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China. wf133@163.com.

International Journal of Environmental Research and Public Health
|February 18, 2017
PubMed
Summary
This summary is machine-generated.

This study analyzes magnetic field leakage from multiple wireless power transfer (WPT) systems. It confirms that human exposure to electromagnetic fields (EMFs) remains within safety guidelines, ensuring safe operation of parallel WPT systems.

Keywords:
human tissuesinduced electric fieldspecific absorption rate (SAR)wireless power transfer (WPT)

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Area of Science:

  • Electromagnetics and Applied Physics
  • Biomedical Engineering
  • Wireless Power Transfer

Background:

  • Multiple wireless power transfer (WPT) systems operating synchronously or asynchronously with phase differences are common in applications like electric vehicles and household appliances.
  • Magnetic field leakage from WPT systems can vary significantly due to unpredictable asynchronous working conditions, raising concerns about human exposure to electromagnetic fields (EMFs).

Purpose of the Study:

  • To predict magnetic field leakage from parallel WPT systems operating with phase differences.
  • To evaluate the induced electric field and specific absorption rate (SAR) in a human body near these systems.
  • To compare computational results with established regulatory limits for human exposure to time-varying EMFs.

Main Methods:

  • Computational prediction of magnetic field leakage from parallel WPT systems with phase differences.
  • Evaluation of induced electric fields and SAR within a human body model.
  • Comparison of predicted EMF exposure levels against ICNIRP guidelines and regulations.

Main Results:

  • Optimal placement for WPT systems depends on phase: in-phase systems are safer in the middle, anti-phase systems are safer peripherally.
  • Metallic shielding effectiveness varies with plate size; larger plates offer better shielding.
  • Human body orientation affects induced electric field distribution, typically centralizing in the trunk and groin, but focusing on lower limbs when centered between in-phase coils.
  • Lung SAR is generally higher than in other organs; liver SAR is minimal.
  • Human exposure to EMFs remains within ICNIRP guidelines for charging powers below 3.1 kW (magnetic field) and 55.5 kW (induced electric field/SAR).

Conclusions:

  • Parallel WPT systems can be safely applied simultaneously, provided charging power is managed.
  • Understanding phase differences and body orientation is crucial for minimizing EMF exposure.
  • Shielding strategies must consider the size of WPT coils for effective magnetic field leakage mitigation.