Simulation, mathematical calculation and comparison of power factor and efficiency for forward, fly back and proposed forward-flyback converter

In this paper, we study about fly back and forward converter analyzed it and calculate power factor and efficiency of both the converters. The fly back converter gives good power factor but efficiency is low because of transformer magnetic inductor, which results large core loss which gives less efficiency. The forward converter has good efficiency but the power factor is low because of the input current becomes low near zero cross AC input voltage progressively lower the power factor. To overcome all such problem, and to achieve high power factor and high efficiency by comparing the advantages of fly back and forward converter we proposed a converter called single-stage balanced forward-flyback converter. This proposed converter operates in both modes forward and fly back. So the losses will be decreased and current zero crossing near input side will be decreased by the balancing capacitor. The power transfer will be efficient in the proposed converter by which we get high efficiency and high power factor. We operate the proposed converter, theoretical analysis and experimental results with resistive load is presented.