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Frontiers of Engineering Reports on Leading-Edge Engineering from the 2017 Symposium (2018) / Chapter Skim
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Wireless Charging of Electric Vehicles - Khurram Afridi
Pages 37-46

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From page 37...
... wireless charging can have much smaller batteries, an option that can reduce their cost and accelerate adoption. While the concept of medium-range wireless power transfer (WPT)
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From page 38...
... The high cost and low power transfer density are particularly problematic for dynamic WPT, as these systems need to have very high power capability to deliver sufficient energy to the vehicle during its very brief time passing over a charging coil. For these reasons dynamic inductive WPT is yet to become commercially viable, although a few experimental systems have been demonstrated (Choi et al.
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From page 39...
... capacitive WPT using plates coupled through electric fields. In both cases, power electronics (comprising a high-frequency inverter and rectifier with semiconductor devices, and gain and compensation networks with inductors, capacitors, and/or transformers)
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From page 40...
... To further reduce fringing fields in capacitive WPT systems, various coupler design approaches have been considered. Those that use dielectric materials for field guidance introduce additional losses and have limited success in mediumrange applications.
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From page 41...
... . Phased-array field focusing provides opportunities for innovation, for example in the exploration of methods that incorporate parasitic interactions between multiple coupling plates in the design of the matching networks.
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From page 42...
... (c) FIGURE 2  Multimodular near-field phased-array capacitive wireless power transfer (WPT)
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From page 43...
... a capacitive wireless power transfer (WPT) system with an active variable reactance (AVR)
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From page 44...
... Research is also needed on • health effects of long-term exposure to weak electric and magnetic fields, • mechanisms to detect living and foreign objects in the proximity of WPT systems, • methods to determine optimal charger power levels and spacing for cost effectiveness, • techniques to embed WPT technology in roadways, and • approaches to analyze impacts of large-scale WPT system deployment on the electric grid. The technologies developed for dynamic EV charging are foundational -- they can also enable wirelessly powered biomedical implants, humanoid robots, and supersonic hyperloop transport.
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From page 45...
... 2016. Design of efficient matching networks for capacitive wireless power transfer systems.
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Key Terms

  • power electronics
  • wireless power
  • capacitive wpt
  • inductive wpt
  • capacitive wireless

  • electric vehicles
  • electric vehicle
  • current gain
  • matching networks
  • capacitive power

  • effective power
  • wireless charging
  • electric fields
  • variable compensation
  • transfer density

  • active variable
  • resonant frequency
  • variable reactance
  • ieee transactions
  • coupled power

  • low power
  • dynamic wpt
  • operating frequency
  • continuously variable
  • coupler design

  • block diagram
  • operating frequencies
  • fringing fields
  • road transportation
  • coupling variations


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