Bi-Directional 3.3 kW On-Board Battery Charger

On-board battery chargers (OBC) are used for charging the batteries in the plug-in hybrid and electric vehicles. In this paper, a bi-directional 3.3 kW OBC consisting of a power factor correction (PFC) circuit, solid state transformer (SST), a buck-boost converter, and AC and DC filters is presented. The objective of the OBC design is to obtain high efficiency, while minimizing the size and the cost of the design. Experimental results show 95.8% efficiency at 2 kW during OBC charge mode and 95.6% efficiency during discharge mode at 1.8 kW. Experimental results show no significant distortions at 2.4 kW input power, and a THD smaller than 2.7 %. The power factor value is measured near unity (0.99) at 2.4 kW.