Two-Switch High Step-Up DC–DC Converter with Low Input Current Suitable for PV Operation

This paper introduces a new two-switch non-isolated high-step-up DC–DC converter with high voltage gain and low current ripple. Compared to the traditional boost converter, this converter has a very high voltage gain. The proposed high-gain converter includes two switches, two inductors, three capacitors and three diodes. This converter uses the implication of a switched capacitor with an inductor for high-voltage gain. It has a high voltage gain in both large and small duty cycles. Moreover, the semiconductor devices have low voltage and current stresses in the proposed DC–DC topology. In addition, the two switches are switched so that the currents created in the two input inductors cause a low ripple in the input current. As a result, it is suitable for photovoltaic (PV) applications due to low input current. In the following discussions, the operation principles and mathematical analyses of the proposed converter are explained. Also, the performance of this converter is compared with other topologies in the text in terms of voltage gain and voltage stress of switches and diodes. Finally, the correct operation of the proposed DC–DC converter is verified by practical testing and simulation using MATLAB/Simulink software, and a 24–140[Formula: see text]V, 150 W DC–DC step-up circuit is implemented to verify its operation.