Page 13 - PEN eBook December 2022
P. 13
DESIGN
Transformerless
Fast-Charging
Solutions for PEVs
By Stefano Lovati, technical writer for EEWeb
In a plug-in electric-vehicle (PEV) system, chargers can be classified into three levels: AC Level
1 (<1.92 kW), AC Level 2 (<19.2 kW), and DC Level 3 (>19.2 kW). Due to their volume and weight,
1
on-board chargers are not recommended in high-power Level 3 systems.
This article will propose two topologies for off-board non-isolated DC fast chargers with power up
to 22 kW. The typical block scheme of this charger includes an AC/DC rectifier stage, followed by a
DC/DC converter. The AC/DC stage is usually implemented using a single-phase or a three-phase
application, depending on the grid requirements. The three-phase option provides the benefit
of sharing the same hardware for both the grid interface and the DC/DC stage. Read the original
article here.
14 DECEMBER 2022 | www.powerelectronicsnews.com DECEMBER 2022 | www.powerelectronicsnews.com 15
