A Novel High Efficiency High Step-up Interleaved Converter with Voltage Multiplier Circuit for a PV System

Abstract- A high step-up converter is proposed for a photovoltaic system. A voltage multiplier used here provides high voltage gain without extreme duty cycle. The voltage multiplier is composed of a conventional boost converter and coupled inductors. An extra conventional boost converter is integrated into the first phase to achieve a considerably higher voltage conversion ratio. The two-phase configuration not only reduces the current stress through each power switch, but also constrains the input current ripple, which decreases the conduction losses of metal–oxide–semiconductor field-effect transistors (MOSFETs). It also functions as a clamp circuit which alleviates the voltage spikes across the power switches. So, the low-voltage-rated MOSFETs can be adopted for reductions of conduction losses and cost. Efficiency improves because the energy stored in leakage inductances is recycled to the output terminal. Keywords- Boost–Fly back converter, High step-up, photovoltaic system, Voltage multiplier module