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High-Voltage Gain Boost Converter Based on Three-State Commutation Cell for Battery Charging Using PV Panels in a Single Conversion Stage Abstract The need for renewable energy sources is on the rise because of the acute energy crisis in the world today. Renewable energy is the energy which comes from natural resources such as sunlight, wind, rain, tides and geothermal heat. These resources are renewable and can be naturally replenished. Therefore, for all practical purposes, these resources can be considered to be inexhaustible, unlike dwindling conventional fossil fuels. In order to give support to the growing technology demand of renewable energy applications, this paper presents a new converter topology for battery charging feasible to photovoltaic systems. The proposed high voltage gain boost converter presents in a three stage commutation cell for a large voltage step-up, high efficiency, and reduced voltage stress on switches due to the transformer. Also ZVS soft switching is naturally achieved a lowing high frequency operation and low commutation losses. This paper presents a novel high-voltage gain boost converter topology based on the three-state commutation cell for battery charging using PV panels and a reduced number of conversion stages. The presented converter operates in zero-voltage switching (ZVS) mode for all switches. By using the new concept of single-stage approaches, the converter can generate a dc bus with a battery bank or a photovoltaic panel array, allowing the simultaneous charge of the batteries according to the radiation level. The main advantage of the topology is the wide voltage step-up ratio with reduced voltage stress across the main switches. Drawbacks of existing system The input current is discontinuous and the use of an LC filter may be necessary. Large in size. High volume and weight. Less efficiency. High switching loss. High ripple current Advantages of existing system High voltage gain with reduced voltage stress. Low ripple current. Less switching loss. The proposed converters use diodes and coupled windings instead of active switches to realize functions similar to active clamps, and it will perform better than their active-clamp. The input current is continuous. The current sharing problem of the interleaved converter can be eliminated by the three-state commutation cell. APPLICATIONS UPS INVERTERS