Automotive

UPS delivery truck wirelessly charged over 11-inch gap

UPS delivery truck wirelessly ...
Researchers have successfully demonstrated a 20-kW wireless charging system on a medium-class hybrid electric delivery truck
Researchers have successfully demonstrated a 20-kW wireless charging system on a medium-class hybrid electric delivery truck
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Researchers have successfully demonstrated a 20-kW wireless charging system on a medium-class hybrid electric delivery truck
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Researchers have successfully demonstrated a 20-kW wireless charging system on a medium-class hybrid electric delivery truck

Back in 2016, the US Department of Energy's Oak Ridge National Laboratory developed a 20-kW wireless charger for electric vehicles with a reported 90 percent efficiency. That was for passenger EVs, and now researchers have successfully tested a system for a medium duty, plug-in hybrid delivery truck.

The grid-connected 20-kilowatt bi-directional wireless charging system was tested on a UPS delivery truck, transferring power from a charging pad over an 11-inch gap using two electromagnetic coupling coils at more than 92 percent efficiency.

The setup comprises the lab's custom coil design and control system, and wide bandgap power conversion systems. It draws from the grid and converts energy to direct current voltage, before a high-frequency inverter switches that to alternating current. A magnetic field is subsequently created and this sends power over the gap where it's converted back to direct current to charge the truck's 60-kWh batteries.

The research team notes that where it might take up to six hours to charge the vehicle's battery over a conventional wired charging setup, the wireless charging system could do so in around three hours.

Since it's a bi-directional system, the truck's batteries could be used to store energy from on-site renewables like solar panels or wind turbines. Technical team lead on the project, Omer Onar, reckons that scaling up the technology to a 50 truck fleet could give operators megawatt-scale energy storage options.

"UPS appreciates the Department of Energy’s support on this effort," said VP of Global Energy and Procurement at UPS, Mike Whitlatch. "This project demonstrates innovative ways to utilize vehicle battery storage at fleet scale to power the vehicle, add resiliency to our facilities and support the grid."

Further testing and data analysis is now being undertaken, but as the passenger prototype has already been scaled up to 120-kW at 97 percent efficiency over a six-inch gap, perhaps a future where wireless battery charging for light and medium duty all-electric or plug-in hybrid vehicles takes around the same time as filling up with fuel at a gas station is not too far off.

Source: ORNL

6 comments
paul314
So where does the waste heat go? At those charging rates, even a few percent in losses is the equivalent of an electric oven on high for hours at a time.
mikewax
"The research team notes that where it might take up to six hours to charge the vehicle's battery over a conventional wired charging setup, the wireless charging system could do so in around three hours." wireless charging faster than wired charging. How is that possible?
Bob Stuart
That wasted and sometimes problematic power would easily pay for a robot that would automatically close that gap for anything stationary for a few seconds.
ljaques
Oak Ridge Gots VooDoo! Or maybe they're redirecting the heat into a heating system for the truck. LIons like coolant for fast charge/discharge, but, yeah, how do they do it faster than via direct cables?
xs400
I'm guessing they are talking about 2 entirely different use cases with wired and wireless. The wired case is a normal 110/240 Volt conventional appliance outlet, while the wireless charging station is a specialized charging location with high power delivery facilities. No other explanation makes sense.
Bill Bennett
What happens to a being going between the the two points whilst charging like a possum, an innocent mouse, or trumpa the hutt?