Design of a non-isolated multi-input converter with soft switching and high step-up voltage gain

Energy is one of the most important factors for the economic growth and development of each country. Most of the energy is consumed in the form of electricity. One of the most important ways to generate electricity is to produce electricity through fossil fuels. However, due to their disadvantages such as limitations and concerns about the environment and increased demand for energy, engineers are focusing on renewable energy sources such as Wind turbines, hydro, solar cells, and the use of renewable energies and energy with less pollution is concerned. As we know, the sun is the largest source of energy on Earth, that the energy exported is used in various ways. due to the high cost of the main element of these systems, the use of this type of energy production system alone has no economic justification. Due to the diversification of energy sources and the need to use more than one source of electricity in some applications, it is better to use a multi-input converter instead of a few independent converters because multi-input converters make it easier to reduce the cost and increase efficiency and increase the power conversion capacity due to lower semiconductor elements, lower inductors, and capacitors, and lower control capacities have become. In many applications of multi-input converters, where the terminal output voltage of a specified value should not be greater, non-isolated converters can be used to simultaneously provide high voltage output and high efficiency. Isolation in multi-input converters has advantages and disadvantages that are selected based on the type of system application. Its advantage is the isolation of sources from each other (in multi-input magnetic converters) as well as the load of the sources, which allows the use of different sources with different voltages. Disadvantages of isolation include design problems for transformers with multiple windings, as well as increasing circuit volume. Since energy sources are inherently low voltage, high-step-up techniques are used to increase their voltage gain. In switching converters, to reduce the amount of inductor and capacitor elements, the increase in switching frequency is desirable. But with increasing switching frequency, the switching losses and electromagnetic disturbances increase, which is due to the use of common elements in multi-input transducers, to increase the problems mentioned above than other switching converters. To solve these problems, one of the voltage or current parameters must be limited at the moment of switching so that soft switching can be achieved. In this paper, a high step-up multi-input converter is presented which, using soft switching techniques, the voltage gain of converter can be increased. In this converter, the combination of the inductance coupling method with the voltage multiplier is used to achieve high voltage. Due to the addition of a voltage multiplier cell, the amount of leakage inductor and the ratio of transformer increase and as a result, the circuit volume decreases. To reduce the voltage stress of the main switch, due to leakage inductor energy and also an active clamp circuit is used to provide a soft-switching mode, Switches with low voltage stress and low conductivity can be used by combining these two methods. first, the structure and performance of the proposed converter to design a high step-up multi-input converter, have been thoroughly analyzed and reviewed. To the converter to function properly, the exact converter design method is presented, Finally, the simulation results for different modes show the correctness of the converter operation.