Fuzzy-linear control of an input-series and output-parallel dc-dc converter

Dc-dc converters can be connected in any combinations to obviate demands for different level of voltage and power in input and output. Input-series and output-parallel connected converter is one of these recently developed combinations. The suitable control scheme for this type of converter necessitates equal voltage sharing for input-series connected modules and output current sharing for the output-parallel connected modules for all operating conditions even with existence of dissimilarity in devices and components used in each module. Such control scheme can be designed by means of linear controllers. But in the case of large variations in the parameters or considerable difference between modules of converter, linear scheme cannot accomplish equal sharing correctly. In this paper a hybrid (fuzzy-linear) control scheme will be developed to solve this problem using MATLAB software.