Single stage AD-DC full-bridge converter for battery charger

A single-stage ac-dc converter consisting of full-bridge converter is proposed for EV charger applications. The proposed approach is superior to conventional two-stage ac-dc converter widely used for EV charger applications. The two stage ac-dc converter is apt to be costly and large. However a single-stage ac-dc converter is suitable to a low cost, small volume due to a reduced number of components. The proposed approach achieves the high efficiency from the light load to heavy load conditions. It also achieves the high power factor at the full load condition. In this paper, the feasibility and practical value of the proposed approach are verified by the experimental results from a 0.8kW / 1.6kW products prototype.