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This paper Presents comparative analysis of IBSPFC &QSC Based IBSPFC by using FPGA. By using this IBSPFC the voltage stress is reduced across the switch when compare to conventional fly-back converters. The multi winding transformer gives higher reliability i.e. if any one of the winding damages other one supplies power to the load. On the other hand, QSC based IBSPFC will achieved Zero voltage & Zero current switching, which will increase more efficiency when compare to conventional single stage integrated converters and IBSPFC. Operating modes of QSC, based IBSPFC&IBSPFC have been introduced. The primary side winding of the fly-back transformer is coupled in series across with bulk capacitor to minimize switch voltage stress and the secondary winding of the 1:1 fly-back transformer. Basic voltage mode control Techniques are used to control the output voltage and current. An input voltage of 25V primary side and 50V battery at secondary side, 100v output, 100W and 100KHz DC-Dc isolated QSC based IBSPFC is implemented using FPGA SPARTAN6LX9 and experimental results and comparative table have been presented.