A Bridgeless Cuk-Cascaded Flyback PFC Converter for EV Charging

This paper presents a novel electric vehicle (EV) battery charger that combines a Bridgeless-Cuk converter with a flyback converter in series, providing an efficient power factor correction (PFC) solution with superior power density and fewer components. By eliminating the conventional diode bridge rectifier (DBR), the design enhances overall efficiency by reducing voltage stress on semiconductor devices and minimizing conduction losses. The flyback converter manages the battery charging process, while the Bridgeless-Cuk converter ensures a near-sinusoidal input current, achieving effective PFC. Operating in discontinuous conduction mode (DCM), the system minimizes the size of passive components and simplifies control, resulting in a more compact and cost-effective design. The proposed charger complies with IEC 61000-3-2 standards for total harmonic distortion (THD), ensuring high power quality across a broad range of input voltages and operating conditions. This advanced topology addresses key challenges in EV battery charging, offering a reliable, efficient, and power-quality-compliant solution with reduced component count, lower voltage stress, and enhanced power density, making it well-suited for modern electric vehicles.