Multiple Input Single Output Converter with Uneven Load Sharing Control for Improved Efficiency

This paper presents the development of multiple-input single-output converter (MISO) with uneven load sharing controller. The premise of this study is to create uneven load current sharing between the converters at different loading conditions in order to maximize the efficiency of the overall MISO converter. The goal is to find a proper ratio of current from each converter to the total load current to achieve the greatest efficiency. The design and operation of the converter was tested and verified through simulation and hardware implementation. Different ratios of current from each converter were used to fully test the MISO converter. For the 5A and 6A load current, the maximum efficiencies were reached with the 70%/30% ratio case, with efficiencies of 94.91% and 95.07%, respectively. For 7A load current, the maximum efficiency was reached with the 60%/40% ratio case, with an efficiency of 94.59%. Results also demonstrate that the efficiency of the unequal current sharing outperforms that obtained from the equal current sharing method.