Three Stage High Step-up Interleaved Boost Converter with Voltage Multiplier Cell

Abstract

In this paper, three stage high step-up interleaved boost converter with three voltage multiplier cells (VMCS) and three state switching cells (3SSC) is proposed. Here an interleaved boost converter is used, as a result higher efficiency and reduced input ripple current is obtained. Also, an additional stage of voltage multiplier i.e., three stages is added so that voltage gain will increase. It reduces switching loss and stress through the devices. Moreover, by employing the three-state switching cell, the size of the inductor is reduced because the operating frequency of the inductor is double of the switching frequency. The current share between the active switches allows further reduction of the conduction losses in case of two stage circuit.  The new method has been examined under various scenarios such as switching loss, ripples, stress and conduction loss. A detailed comparative study is done between two stage multiplier cell and three stage multiplier cell is made regarding power, efficiency, total stress and losses. The simulation of proposed converter with input voltage of 12 V and output of 115 V was done using MATLAB and the simulation result was validated. Finally, a prototype was built for an input voltage of 12 V, 70 V output voltage and 14 W output power.