Voltage Multiplier Technique

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This paper introduces the use of the voltage multiplier technique and passive absorption circuit applied to the non-isolated dc-dc converter in order to obtain high efficiency and high voltage gain. A passive absorption circuit is inserted in the interleaved flyback converter to transfer the leakage energy to load. The operation principle of the circuit is explained. This paper also deals with MPPT controlled high step up dc-dc converter. The switching element used in the flyback converter is MOSFETs, which is completely on and completely off. This is because MOSFET has high power rating and high switching speed. Moreover, high voltage conversion ratio is achieved. The simulated results are presented with R load. Keywords: Interleaved flyback converter, passive absorption circuit, high voltage gain 1 INTRODUCTION A DC-DC converter is a device that accepts a DC input voltage and produces a DC output voltage. In many industrial applications, it is required to convert a fixed voltage dc source into 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, the selection of power device for a particular application not only the required voltage and current levels but also its switching characteristic. The key parameters to look for in the MOSFET are the switching time and current rating. These two parameters greatly affect the maximum switching frequency of the converter. Because switching speed and associated power losses are very important in the power electronics circuits. For example, the BJT is minority carrier device, whereas the MOSFET is a majority carrier device ... ... middle of paper ... ...4206, Sep. 2011. [7] K. K. Law, K. W. Cheng, and Y. P. Yeung, “Design and analysis of switched-capacitor-based step-up resonant converters,” IEEE Trans. Circuits Syst. I, Fundam. Theory Appl., vol. 52, no. 5, pp. 1998–2016, May 2005. [8] J. M. Kwon and B. H. Kwon, “High step-up 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 Built-In Transformer Voltage Multiplier Cell” IEEE Trans. Power Electron., vol. 27, no. 8, pp. 3557- 3567, Aug. 2012. [10] R. J Wai, C. Y. Lin, R. Y. Duan, Y. R. Chang, “High-efficiency dc-dc converter with high voltage gain and reduced switch stress,” IEEE Trans. Ind. Electron., vol. 54, no.1, pp.354 – 364, Feb. 2007.
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