Cuk PFC Converter Based on Variable Inductor

When the input inductor operates in discontinuous current mode (DCM), Cuk converter can automatically achieve power factor correction (PFC) function with only a simple voltage control loop. However, conventional PFC suffers from high intermediate capacitor because of lack feedback and relatively low (PF). In this paper, using variable which varies transient rectified is proposed to enhance PF reduce by injecting controlled DC bias into auxiliary winding inductor. The operating principles based on are analyzed detail, analysis PF, capacitor, design considerations provided. To verify feasibility scheme compare characteristics both traditional converter, 108W experimental prototype built tested. results show that significantly decrease voltage, increase efficiency compared converter.