A Single-Stage Bi-directional AC-DC Converter with no Electrolytic Capacitor for EV

摘要

An isolated, single-stage bi-directional AC-DC converter for electric vehicle battery charger with no electrolytic capacitor and 8 active switches is proposed. The proposed converter prevents low frequency power ripple from going to the battery. This prevents extra heat production in the battery and consequently causes the battery to last longer. No use of an electrolytic capacitor in the circuit increases the reliability of the system. To control the circuit, a four-part controller is proposed. The controller obtains ZVS for all the active switches while it optimizes the performance of the system in terms of conduction losses. Simulation results with PSIM, and experimental results to verify the theory, have been carried out.