Description

ABSTRACT

In this paper, a new non-isolated Interleaved dc/dc converter with highvoltageconversion ratio is presented. The proposed converter combined with interleaved converter techniques and voltage multiplier cell (diode/ capacitor/inductor). The voltage stress across the power semiconductors (power MOSFETs/diodes) is decreased compared to SEPIC, conventional

boost converter. The low normalized stress causes to using the low rating semiconductors. In fact, the overall efficiency of the proposed converter will be increased by using MOSFETs with lower resistance RDS(on) and lower ranges for power diodes. To confirm the accuracy theoretical analysis of the proposed converter and operation converter, a laboratory prototype in about 190 W with operating at 40 kHz is built and tested.

KEYWORDS

Non-isolated; dc/dc

converter; interleaved; highvoltage

gain; low-voltage

stress

INTRODUCTION

In this study, presents a new high step-up interleaved dc-dc converter for renewable applications. The proposed converter based on combination of the voltage multiplier units and interleaved techniques, also consist of low input current ripple which capable to obtain high-voltage gain and high power level. In addition, the normalized voltage stress across the power MOSFETs and power diodes is low due to the utilization of voltage multiplier units which this leads to the voltage of power semiconductors clamp to capacitors of voltage multiplier units. As a result, using the power MOSFETs and power diodes with low rating (low current/voltage) causes to decrease the total power losses of the system. Also, using a power MOSFET with lower on state resistance Rds(on) leads to decrease the cost and increase the efficiency of the converter.