A Non-isolated Buck-Boost DC–DC Converter with Continuous Input Current and Wide Conversion Ratio Range for Photovoltaic Applications

In this paper, a non-isolated buck-boost dc–dc converter is presented which benefits from broad range of conversion ratio. The designed topology, contrary to the classic buck-boost converter, has continuous input current. In addition, the introduced converter delivers high step-up voltage gain, making it a good candidate for industrial, electric vehicle and remarkably, renewable energy applications. Operation basis of the introduced converter is discussed thoroughly. The presented converter is compared with similar topologies in respect of several measures, such as the element number, voltage gain, switch voltage stress and continuity or discontinuity of the input current. By taking into account of the merits of the given converter, it is possible to utilize this converter in renewable energy implementations, distinctively in photovoltaic systems.