Improving large signal analysis in DC/DC converters with a modified small signal model

Starting from large signal considerations, the authors introduce a modified small signal model to make a critical evaluation of the pulsed load operation of the basic DC/DC converters. The necessary constraints which permit the use of the proposed model with acceptable accuracy in typical large signal operation are explored. It is confirmed that the modified small signal model proposed here is able to predict DC/DC dynamical behavior if global large signal stability criteria are first achieved, and that it can measure the prediction error in accordance with the converter characteristic studied. These conclusions indicate that more traditional and complex feedback networks can be incorporated in a simple way