Researchers at Oak Ridge National
Laboratory demonstrated a 20-kilowatt bi-directional wireless charging
system on a UPS plug-in hybrid electric delivery truck, advancing the
technology to a larger class of vehicles and enabling a new energy storage
method for fleet owners and their facilities.
The demo was the first of its
kind to achieve high power transfer across an 11-inch air gap
between the truck and a charging pad. Specially designed electromagnetic
coils and power electronic converters transferred electricity from the grid
to the vehicle battery terminals at more than 92% efficiency.
At a 20-kilowatt level, it would take about three hours to charge the
vehicle’s battery packs; conventional wired charging takes between five and
six hours. With its bi-directional design, the system supports use of the
vehicle’s batteries for energy storage.
“The system expands the possibilities for fleets that want convenient,
efficient electric vehicle charging as well as electricity storage
solutions,” said ORNL’s Omer Onar.
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