A New Ultra High Step-Up Converter with Continuous Input Current for Renewable Energy Applications

Abstract

This paper proposes a new single-switch high step-up DC-DC converter, combines voltage multiplier cell (VMC), and a coupled-inductor (CL) to obtain an ultra-large voltage gain. Turn ratio of CL and duty cycle together determine the converter voltage conversion ratio, so it can obtain any wanted voltage without the converter to operate at the inappropriate duty cycles. In the structure of the converter, with utilization of the clamp circuit, the voltage spikes across the switch are declined remarkably. So, we can select switch with lower R DS(on) and voltage rating which declines conduction losses and reduce costs. Moreover, the energy of the CL leakage inductance is recycled which increases the efficiency of the converter. The suggested topology input current ripple is very low which is a very important factor for renewable energy systems such as PVs. The presented topology steady-state analysis and operation principle are expressed completely in this paper. Also, the superiority of the suggested topology is demonstrated over several similar most important recently presented DC-DC topologies in the comparison study. Eventually, the validity of theoretical analysis is verified using simulation results with a power rating of 300 W and an output voltage of 404 V.