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Littelfuse Off-Board Charger Sub-Unit Power Converters are required for DC charging stations capable of charging to 80% SOC in under 30 minutes. These fast-charging applications require modular power converters, which can be paralleled to cater to different power levels, thereby enabling fast charging. The most critical parameters are energy density and system efficiency. A sub-unit power converter in a DC charging station consists of an AC/DC power stage and DC/DC power stage integrated into the charging station.
The AC/DC stage (also known as the PFC stage) is the first level of power conversion in an EV charging station. It converts the incoming AC power from the grid (380VAC to 415VAC) into a stable DC link voltage of around 800V.
The DC/DC stage is the second level of power conversion in an EV charging station. It converts the incoming DC link voltage of 800V (in the case of three-phase systems) to a lower DC voltage to charge the battery of an electric vehicle. The electric vehicle charging standards are governed by Combined Charging System (CCS) and CHAdeMO standards. Multiple power topologies are available based on power levels used in EV Charging Stations.
