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A Single-Switch High Step-Up DC-DC Converter Based on Integrating Coupled Inductor and Voltage Multiplier Cell for Renewable Energy Applications

In this paper, a high step-up, single switch, non-isolated, coupled inductor based DC-DC converter is proposed for sustainable energy applications. A high voltage gain is achieved by applying a coupled inductor and two voltage multiplier cells in the structure of proposed converter. The passive clamp that is connected to the main switch recovers the coupled inductor leakage inductance energy and limits the voltage spike on the power switch. Thus, low on-state resistance of the power switch can be adapted to decrease the conduction loss. The features such as coupled inductor with a low turn ratio, high voltage conversion ratio in suitable duty cycles, , high efficiency, recycled energy of leakage inductor and low voltage stress on the power switches and diodes make the presented converter appropriate for sustainable energy applications. The steady state analysis and voltage stress of the power switch and diodes of the converter are expressed in detail. Finally, simulation results in PSIM software have been presented to confirm the performance of the suggested structure.