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An Isolated High Step-Up Converter with Continuous Input Current and LC Snubber Abstract: In this paper, a novel galvanic isolated high step-up converter is presented, which is suitable for renewable energy applications and integrates a boost converter, a coupled inductor, a charge pump capacitor cell, and an LC snubber. Since the proposed converter possesses an input inductor, the input current is continuous. Furthermore, the proposed converter can achieve high voltage gain without extremely large duty cycle and turns ratio of the coupled inductor by using the charge pump capacitor cell. Moreover, the leakage inductance energy can be recycled to the output capacitor of the boost converter via the LC snubber, and then the leakage inductance energy stored in the capacitor of the boost converter can be transferred to the output load. As a result, the voltage spike can be suppressed to a low voltage level. Finally, the basic operating principles and some experimental results are provided to verify the effectiveness of the proposed converter. Existing system: In recent years, high step-up dc-dc converters are widely used in many renewable energy systems such as fuel cells, photovoltaic (PV) panels, etc. However, the output voltages of these renewable energy systems are usually not only unstable but also not high enough to supply the output load or to be linked to an AC power grid via a DC-AC inverter. Consequently, a high step-up converter is required to obtain a high output voltage. For non-isolated converters to be considered, the traditional boost and buck-boost converters are widely used because of their simple structures. Proposed system: In order to achieve a high output voltage, possess a non-pulsating input current, satisfy the galvanic isolation, and maintain a high efficiency. A novel isolated high step-up converter is presented, which integrates a boost converter, a coupled inductor, a charge pump capacitor cell, and an LC snubber. Therefore, in the proposed converter, the input current supplied from the source is continuous, a high voltage gain can be realized without high turns ratio and large duty cycle, the leakage inductance energy can be recycled to the output load, the voltage stresses across switches are low, and galvanic isolation exists between the input terminal and the output terminal. Circuit diagram: Reference: [1] H. Hu, S. Harb, N. Kutkut, I. Batarseh, and Z. J. Shen, “Power decoupling techniques for micro-inverters in PV systems-a review,” IEEE ECCE’ 10, pp. 3235-3240, 2010. [2] Q. Li, and P. Wolfs, “A review of the single phase photovoltaic module integrated converter topologies with three different dc link configurations,” IEEE Trans. Power Electron., vol. 23, no. 3, pp. 13201333, 2008. [3] M. David, N. Scholten, and W. L. Soong “Mirco-inverters in small scale PV systems: a review and future directions,” IEEE AUPEC’ 13, pp. 1-6, 2013. [4] R. W. Erickson and D. Maksimovic, Fundamentals of Power Electronics, 2nd ed., Norwell: KLuwer Academic Publishers, 2001.