Abstract— Various noncontacting methods of plug-in electric
vehicle charging are either under development or now deployed
as aftermarket options in the light-duty automotive market.
Wireless power transfer (WPT) is now the accepted term for
wireless charging and is used synonymously for inductive power
transfer and magnetic resonance coupling. WPT technology
is in its infancy; standardization is lacking, especially on
interoperability, center frequency selection, magnetic fringe
field suppression, and the methods employed for power flow
regulation. This paper proposes a new analysis concept for power
flow in WPT in which the primary provides frequency selection
and the tuned secondary, with its resemblance to a power
transmission network having a reactive power voltage control, is
analyzed as a transmission network. Analysis is supported with
experimental data taken from Oak Ridge National Laboratory’s
WPT apparatus. This paper also provides an experimental
evidence for frequency selection, fringe field assessment, and the
need for low-latency communications in the feedback path.
Index Terms— EV charging, inductive power transfer, wireless
power transfer.
Abstract— Various noncontacting methods of plug-in electricvehicle charging are either under development or now deployedas aftermarket options in the light-duty automotive market.Wireless power transfer (WPT) is now the accepted term forwireless charging and is used synonymously for inductive powertransfer and magnetic resonance coupling. WPT technologyis in its infancy; standardization is lacking, especially oninteroperability, center frequency selection, magnetic fringefield suppression, and the methods employed for power flowregulation. This paper proposes a new analysis concept for powerflow in WPT in which the primary provides frequency selectionand the tuned secondary, with its resemblance to a powertransmission network having a reactive power voltage control, isanalyzed as a transmission network. Analysis is supported withexperimental data taken from Oak Ridge National Laboratory’sWPT apparatus. This paper also provides an experimentalevidence for frequency selection, fringe field assessment, and theneed for low-latency communications in the feedback path.Index Terms— EV charging, inductive power transfer, wirelesspower transfer.
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