Flexible High Voltage Gain Converter based on Switched LC Cells with Common Ground for DC Microgrid

Integration of renewable energy sources such as solar and fuel cell has increased the popularity of DC microgrids. Continuous input current, presence of common ground to avoid electromagnetic interference (EMI) issues, and lower voltage stress are key features of DC-DC converters. To connect micro-grids with low output voltage of these sources, high voltage gain converters are required. This manuscript presents a non-isolated triple switch with a shared ground to achieve flexible high-voltage gain. The proposed converter utilize two inductors at low voltage (LV) side, that are connected in parallel/ series during charging and discharging mode. Moreover, switched-capacitor (SC) cells are connected in such a manner that they discharge their energy to load to achieve high voltage gain. Operating principle, design equation, and device stress are analyzed in conduction mode (CCM). Finally, to validate mathematical analysis laboratory prototype (40/400V) generating 400W is developed and tested.