Delta leading effort to develop EV extreme fast chargers
Autonomous Vehicle Technology announces 2020 ACES Award Winner in Electrification | Charging | Infrastructure category
Delta has begun work on a research program, with a 50% cost share by the U.S. Department of Energy (DOE), to develop an EV extreme fast charger (XFC) with capacity up to 400 kW that’s intended to provide capable EVs a 180-mi (290-km) range with less than 10 min of charging. The initiative, using a SST (solid-state transformer)-based XFC design, is being led by a program development team of industry experts based out of Delta’s automotive division, located in Livonia, MI, and researchers from the Delta Power Electronics Laboratory, located in North Carolina’s Research Triangle Park. Delta’s partners for the three-year, $7 million project include General Motors LLC, DTE Energy, Center for Power Electronics Systems (CPES) Virginia Tech, NextEnergy, the Michigan Agency for Energy’s Energy Office, and the City of Detroit’s Office of Sustainability. The novel SST power cell topology uses medium-voltage alternating current at 4.8 kV or 13.2 kV, eliminating conventional line frequency transformer technology, which converts low voltage alternating current to a direct current to charge the high voltage battery in an EV. Combined with a new silicon carbide MOSFET (metal oxide semiconductor field-effect transistor) device, the proposed SST enables a 3.5% improvement in grid-to-vehicle efficiency to levels up to 96.5%, a 50% reduction in equipment footprint, four times less weight than today’s DCFC EV chargers, and a high-voltage direct current port to use energy storage and renewable energy systems. In addition, the 400-kW XFC prototype, which is expected to be ready in 2020, will reportedly have a power level enabling 3C charging speed on tomorrow’s long-range EVs. With this technology, Delta says that EV drivers will need close to 10 min to achieve an additional 50% of vehicle range on their vehicles.
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