Abstract
In this work, a medium and high power rating electric vehicle (EV) charger based on Vienna rectifier (VR) and half bridge resonant inductor-inductor-capacitor (LLC) converter, is presented. The two switch VR forms the front-end converter, and performs active power factor correction (PFC), by operating under continuous conduction mode (CCM). Moreover, its output voltage is regulated by an outer voltage control loop, in a two loop pulse width modulated (PWM) control. The EV battery is charged using constant voltage (CV) and constant current (CC) controller by a pulse frequency modulation (PFM) based half bridge LLC converter. The DC-DC conversion stage of this charger is soft switched due to zero voltage switching in LLC converter. Simulation results and its performance under steady state and dynamic conditions, are presented. Moreover, the power quality (PQ) and steady state results are verified and presented for a 5.6kW experimental prototype.
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