Interleaved Landsman Converter Fed EV Battery Charger with Power Factor Correction

In this paper, an interleaved Landsman converter fed electric vehicle (EV) battery charger followed by a flyback converter, is designed and evaluated to develop a low cost charging solution for the FAT battery. A built-in wave-shaping feature is obtained at the front-end of the charger due to power factor correction (PFC) characteristics of the interleaved converter. The converter configuration is developed using two Landsman converter cells, which are designed in DCM mode. The discontinuous conduction mode operation of front-end converter along with the interleaved technology, offers the advantage of zero current switching, reduced sensor used at the output as well as reduced input current and output voltage ripple for battery charger. However, the flyback converter provides the current control during the charging of battery in constant current (CC) and constant voltage (CV) regions. The proposed charger is evaluated for improved PF based performance under wide input voltage variations. The harmonics spectrum of mains current follows the recommended PQ (Power Quality) regulations such as IEC 61000-3-2 standard.