HIGH-PERFORMANCE ON-BOARD SINGLE-STAGE CHARGER FOR ELECTRICAL VEHICLES

Abstract

This study introduces a standalone, single-stage on-board electric car charger that operates without
the need for an intermediary DC-link. The converter has soft switching in semiconductors regardless of load
variation for the whole AC line voltage range, based on an isolated current-source topology. Furthermore, it doesn't
need any additional clamp circuits or snubbers. A comparatively straightforward phase shift modulation provides
voltage management and power factor correction while minimizing the amount of circulating energy. The highest
efficiency is attained in the continuous power charging mode, which sets the charger apart. An analysis is conducted
on the topology's design limitations, component stresses, and control technique. A 3 kW experimental SiC-based
prototype that achieves a peak efficiency of 96.4% is used to validate the concept. The charge is characterized by its
efficiency, which reaches its greatest in the constant power charging mode. An analysis is conducted on the
topology's design limitations, component stresses, and control technique. A 3 kW experimental SiC-based prototype
that achieves a peak efficiency of 96.4% is used to validate the concept. Furthermore, when running in constant
power mode at maximum power, the charger has shown efficiency above 95% with a THD of 4.1%.