Combination of DCM and CCM DC/DC converters for input-series output-series connection

This work presents the analysis of the behavior of a modular system of DC/DC converters with input-series output-series connections. The goal is to explore a simple solution that provides a stable operation by connecting totally independent converters working in DCM, except one of them (working in CCM) that determines the input-output voltage ratio. This alternative can be applicable when the input voltage and load vary in a very small range. Otherwise, the working conditions or the modules are very variable and they have to be oversized. The paper deals with an improved version of this solution that allows the variation of the input voltage and load in a wider range, achieving a better performance when including an additional control of the input voltages of the DCM modules.