High Gain Isolated DC-DC Converter with Current Sharing for Hot Swap for Photovoltaic Panels

The use of power converters in DC micro-grids is a requirement because it allows connecting different types of sources to a single DC bus that distributes electrical power where several loads are connected. This paper presents DC-DC power converter modules, based on the two-phase Flyback converter, with inputs in parallel to a 30 V and 250 W photovoltaic panel, and its outputs in series, to generate a 380 V voltage level. The converter operates in interleaved mode with current mode control, and a shared current control is added between the modules with the hot-swap function. Three of these modules are interconnected to form a DC micro-grid. The converter features a low component count, compared to the high voltage gain achieved, as well as galvanic isolation between the source and the DC bus, efficient current balancing between the modules in the micro-grid is achieved with the implemented shared current control method.