Abstract: A method and system for implementing DMPP tracking of partially shaded/uniformly illuminated photovoltaic arrays using switched capacitor DC-DC converter is disclosed. Here, a dedicated SC converter is connected across each PV cell or PV module made of series connected PV cells wherein series connected modules make a PV string and parallel connected PV strings make up a PV array. This SC converter injects an equalization current across the PV module or PV cell so that the total current in the parallel combination of the PV module or PV cell and the corresponding SC converter is the same as the PV string current. In another implementation of DMPP tracking using SC converters, a dedicated SC converter is connected across each isolated PV module to perform MPP tracking of the respective PV module. Then all MPP tracking SC converter outputs are diode ORed to the common load.

Abstract: A method and system for implementing DMPP tracking of partially shaded/uniformly illuminated photovoltaic arrays using switched capacitor DC-DC converter is disclosed. Here, a dedicated SC converter is connected across each PV cell or PV module made of series connected PV cells wherein series connected modules make a PV string and parallel connected PV strings make up a PV array. This SC converter injects an equalization current across the PV module or PV cell so that the total current in the parallel combination of the PV module or PV cell and the corresponding SC converter is the same as the PV string current. In another implementation of DMPP tracking using SC converters, a dedicated SC converter is connected across each isolated PV module to perform MPP tracking of the respective PV module. Then all MPP tracking SC converter outputs are diode ORed to the common load.

Abstract: Technologies generally described herein relate to a cell balancing and charging scheme for a serially coupled Li-Ion battery pack supported by a photovoltaic cell array power source. A switched capacitor DC-DC converter and a cell monitoring approach may be used to charge and cell balance the battery pack. When one of the cells falls below a predefined voltage, a capacitor (charged by the photovoltaic array) may supply current to bring the voltage to the predefined point. Continuous monitoring for the cells during charging and discharging may ensure cell voltage changes beyond the predefined limit are detected timely. Cell balancing may be performed even in the absence of photovoltaic (PV) array illumination.

Abstract: Technologies generally described herein relate to a cell balancing and charging scheme for a serially coupled Li-Ion battery pack supported by a photovoltaic cell array power source. A switched capacitor DC-DC converter and a cell monitoring approach may be used to charge and cell balance the battery pack. When one of the cells falls below a predefined voltage, a capacitor (charged by the photovoltaic array) may supply current to bring the voltage to the predefined point. Continuous monitoring for the cells during charging and discharging may ensure cell voltage changes beyond the predefined limit are detected timely. Cell balancing may be performed even in the absence of photovoltaic (PV) array illumination.