Taiwan-based Delta Electronics' subsidiary in the Americas demonstrated last week 400kW extreme fast EV chargers to partners in the US including General Motors (GM), DTE Energy, NextEnergy, American Center for Mobility (ACM), and the US Department of Energy (DOE).
The solid-state transformer (SST)-based extreme fast charger (XFC) for EV was the result of a research project of US$7 million, the Taiwan-basec company said. The US DOE sponsored 50% of the program costs since 2018.
A key aspect of extreme fast charging is the ability to connect directly to medium voltage distribution and provide faster, more efficient charging compared to lower voltage chargers, said Richard Mueller, DTE Energy Technology, Standards and Interconnection manager.
The 400kW (1000V/400A, 500A below 800V) XFC has three-phase 13.8 kVac medium voltage SiC MOSFET SST topology to provide 500A charging current and grid-to-vehicle energy efficiency as high as 96.5% with a system weighting four times less than conventional fast DC EV chargers. Moreover, its HVDC power architecture enables connection with renewable energy and energy storage systems (ESS) to lighten the impact on the electricity grid during times of high EV charging demand.
According to Kelvin Huang, president of Delta Electronics (Americas), the company has delivered more than 1.5 million EV chargers worldwide over the past decade.
