Pre-sizing of dc-dc converters by optimization under constraints; influence of the control constraint on the optimization results

This paper presents an optimization approach to pre-size dc-dc converters by integration of the control constraint. This approach is carried out in two main steps. The first step consists on determining the most adapted architecture to answer the specifications and the appropriate technologies of the passive and the active components of the selected architecture representing the minimal of the major constraint (like volume or cost). In addition, the designer can have an evolution of this major constraint by technology considered for each component (active and passive) and used in the chosen architecture. The models used in these step are developed from manufacturer datasheets. The second step consists on optimizing the selected architecture by considering the appropriate technologies resulting from the first step under multi-physic constraints: thermal, losses (or efficiency), volume, electromagnetic compatibility and control constraints .... The proposed approach allows reducing significantly the computing time which is suitable in a pre-sizing phase where several parameters must be optimized and multi-physic constraints must be respected.