This article presents the use of voltage multiplier technique and passive absorption circuit applied to non-isolated DC-DC converter to achieve high efficiency and gain high voltage. A passive absorption circuit is inserted into the interleaved flyback converter to transfer leakage energy to the load. The principle of operation of the circuit is explained. This article also discusses MPPT controlled high boost DC-DC converter. The switching element used in the flyback converter is the MOSFET, which is fully on and fully off. This is because the MOSFET has a high power rating and high switching speed. In addition, a high voltage conversion ratio is obtained. Simulated results are shown with R load.Keywords: interleaved flyback converter, passive absorption circuit, high voltage gain1 INTRODUCTIONA DC-DC converter is a device that accepts a DC input voltage and produces a DC output voltage. In many industrial applications, it is necessary to convert a fixed voltage DC source to a variable voltage DC source. Typically, the output produced is at a different voltage level than the input. In any type of DC-DC converter circuit, selecting the power supply device for a particular application not only the required voltage and current levels but also its switching characteristics. The key parameters to look for in the MOSFET are switching time and current rating. These two parameters greatly affect the maximum switching frequency of the converter. Because the switching speed and associated power losses are very important in power electronic circuits. For example, the BJT is a minority carrier device, while the MOSFET is a majority carrier device...... middle of paper ...... 4206, September 2011.[7] KK Law, KW Cheng, and YP Yeung, “Design and analysis of switched capacitor boost resonant converters,” IEEE Trans. Circuit system. Me, Fundam. Theory Appl., vol. 52, no. 5, pp. 1998-2016, May 2005.[8] J. M. Kwon and B. H. Kwon, “High-boost active clamp converter with input current doubler and output voltage doubler for fuel cell power systems,” IEEE Trans. Power electron., vol. 24, no. 1, pp. 108-115, Jan. 2009.[9] Y. Deng, Q. Rong, W. Li, Y. Zhao, J. Shi, and X. He, “Single-switch high-step-up converters with integrated transformer voltage multiplier cell,” IEEE Trans. Power electron., vol. 27, no. 8, pp. 3557-3567, August 2012.[10] R. J Wai, CY Lin, RY Duan, YR Chang, “High-efficiency DC-DC converter with high-voltage gain and reduced switching stress,” IEEE Trans. Ind. Electron., vol. 54, no.1, pp.354 – 364, February. 2007.