Two Input Positive Dc-dc Buck-boost Converter Topology

A new multiple-input hybrid energy conversion topology is presented. The proposed topology is capable of combining different energy sources with different voltagecurrent characteristics, while achieving low part number and bi-directional operational. The Multiple-input converters have many applications such as grid connected integrated hybrid generation systems, fuel cells, micro grid-based telecom power systems, uninterruptible power supplies, electric and hybrid electric vehicles. Compare to previous multiple-input buck-boost converter, the proposed topology provides positive output voltage; it is capable of bi-directional operation; and it has the capability of operating in buck, boost, and buck-boost modes. A fixed frequency switching strategy is considered and analytical analyses as well as detailed device level simulation results are presented for a two input Buck-Boost converter.