Analysis and Design of a Single-Phase Bridgeless Cuk-based PFC Converter as On-Board Charger with Reduced Number of Components and Losses

In this paper, a new single-phase bridgeless Cuk-based power factor corrected (PFC) converter with reduced number of components for on-board charging application is presented. The converter is operated in discontinuous current conduction mode to achieve natural PFC at AC input, and thereby sensing of input voltage and input current is avoided, which makes the converter operation cost-effective, and increases the converter robustness to high-frequency noise. The converter control is quite simple, and requires only one control loop, and one sensor. The proposed converter requires less components, and the components voltage stress is less when compared to the conventional Cuk converter, which reduces the components switching losses and enhances the converter efficiency. Further, only one semiconductor is in current flowing path for throughout the converter operation. Thus, this will reduce the conduction losses, and further it eases the converter thermal management. The converter detailed steady state operation for one switching cycle is presented, and the design expressions for each passive component are derived to simplify the converter design. The proposed converter analysis and the design are confirmed with the simulation results from PSIM software.