A new multi-input three-level integrated DC/DC converter for renewable energy systems

This paper proposes a new multi-input isolated three-level converter for renewable and sustainable energy systems. Multiple dc sources are integrated to the three-level dc/dc converter, resulting in reduced part-count and allowing flexibility in transformer design and dc link voltage selection. The proposed architecture eliminates two boost switches which are present in the two-stage counterpart, and enables utilizing low voltage switches. The input inductors are operated in DCM sharing the same duty cycle. Thus, power can be shared between input sources with proper selection of input inductors. A low voltage prototype has been designed to serve as a proof of concept.