A transformer‐less high‐boosting common‐grounded multi‐phase DC–DC converter with continuous input‐current favourable for low‐power applications

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AbstractThe traditional dc–dc converters have limited boosting ability. Significant voltage gains can be accomplished only at extreme duty ratios, where the high voltage/current stress and losses occur on semiconductors. This work proposes a common‐ground multi‐phase boost dc–dc converter that benefits from high boosting factor at low duty ratios, continuous input‐current and minimum operational modes (only two at CCM) regardless of number of phases. Due to the presence of common‐ground point, the proposed converter can efficiently remove the leakage current while using the PV as the input source. Also, because of multi‐phase nature, the proposed converter has low current stress on its input devices, which leads to lower voltage drops and better efficiencies. The number of phases can freely be selected based on required boosting factor or converter efficiency. To assure of proper performance of proposed converter, the three‐phase (n = 3) version has been investigated in detail and its steady‐state analysis as well as real‐gain and loss calculations have been presented. The competitiveness of the suggested converter has been verified by performing comprehensive comparative analysis. The experimental results (for n = 3) have also been provided to certify the correct performance of suggested converter.