Power factor improvement in modified bridgeless landsman converter fed EV battery charger

This work presents the design and implementation of a novel charger for battery-operated electric vehicles (EVs) with enhanced power factor correction at the front end. The proposed configuration replaces the conventional diode converter typically used in EV chargers with a modified Landsman power factor correction (PFC) converter. This PFC converter is cascaded with a flyback isolated converter, allowing for efficient charging of the EV battery by first operating in constant current mode and then transitioning to constant voltage mode. The modified PFC converter is controlled using a single sensed parameter, ensuring robust regulation of the DC-link voltage and unity power factor operation. The proposed charger topology offers several advantages, including improved power quality, low device stress, and reduced input and output current ripple, alongside lower input current harmonics compared to conventional chargers. To validate compliance with IEC 61000-3-2 standards, a prototype was developed and tested to charge a 48V, 100Ah EV battery under varying input voltage conditions. The performance of the charger was found to be satisfactory across all tested scenarios, demonstrating its effectiveness and reliability in improving, EV charging systems.