Dual Input High Step-Up Quasi-Z Source Converter

In this paper, a new dual input isolated DC/DC converter with high voltage transfer gain is presented. The topology utilizes coupled inductor. Compared with the conventional quasi Z source DC-DC converter, the proposedconverter has dual input sources and features high voltage gain with lower voltage stress of the impedance network capacitors. This converter is interesting for hybridizing alternative energysources such as photovoltaic (PV) and battery. Supplying theoutput load, charging or discharging the battery can be made by the PV individually, also the presented converter can even operate when one input fails to provide energy to the load. Boththe input sources current and output load current of the proposed converter are continuous, which provides advantage for input and output filtering. The operating characteristic of theproposed solution is analyzed in detail and compared to the existing topology. Finally simulation results are presented to verify the validly of proposed converter.