Efficency analysis of bridgeless Cuk converter for PFC applications

Performance comparisons between the proposed and conventional Cuk PFC rectifiers are performed based on circuit simulations. The proposed topologies are designed to work in discontinuous conduction mode (DCM) to achieve almost a unity power factor and low total harmonic distortion of the input current. The absence of an input diode bridge and the presence of only two semiconductor switches in the current flowing path during each interval of the switching cycle result in less conduction losses and an improved thermal management compared to the conventional Cuk PFC rectifier. The aspects regarding control strategies for Power Factor Correction (PFC) converters are investigated. The major control techniques to absorb sinusoidal input currents in PFC´s are reviewed and analyzed.