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Technical Lecture

Single-Phase and Three-Phase Input

T01.9 - A Universal DC Fast Charging Front-End with Optimized Film Capacitor Design

Tuesday, March 18, 2025
11:40 AM – 12:00 PM ET
Location: Level Three, A315
DC fast charging stations must be connected to either single-phase or three-phase grids based on the available utility, requiring two separate bidirectional charging units to be designed, developed and maintained. This article proposes a three-leg high power density universal charging front-end capable of both single and three phase connectivity and operation depending on the deployment configuration. Hardware re-utilization of both active and passive components across single phase and three phase deployment modes results in a high power density, versatile charging unit. The paper discloses the design and volume/loss optimization methodology for the unit’s dc link and buffering capacitors in film technology for a 800 V dc bus, 50 kW-three-phase / 33 kW-single-phase case study. Experimental operation of a scaled-down 10 kW unit is reported in this digest.