A Method For DC-DC Switching Converter Modeling

Modeling analysis DC-DC switching converters is the key step to study, analyze and design switching power supplies. Difference between the traditional ideal model and the actual nonideal converter is a problem that cannot be ignored to model switching converters. In order to solve the problem, this dissertation is devoted to study on modeling and analyzing DC-DC switching converter. The research results are helpful to optimize behavior and improve design efficiency of switching power supplies.(1) Have discussed State space averaging models of DC-DC switching converters .For example of Boost converter, State space averaging models was builded. State space averaging was proven to be the first-order approximation of averaging method, and the waveforms of simulations of typical Boost converter circuit models and mathematic models were compared by MATLAB software, and the applicable conditions of state-space averaging principle were quantificationally discussed.(2) On the basis of the current situation and developing trend of modeling methods of DC-DC switching converters discussed, a unified equivalent models is put forward to model basic DC-DC converters operating in the continuous conduction mode (CCM) or the discontinuous conduction mode (DCM) . The method is exemplified by modeling boost converter, High Frequency Network Averaging models was builded by modeling boost converter, the modeling procedures are illustrated concretely, simulation analysis of DC-DC converters operating in the continuous conduction mode (CCM)or the discontinuous conduction mode (DCM) are performed used three measures. Steady-state and dynamic small-signal analysis are discussed based on the derived models, transfer function was given, the derived models are intuitive and of clear physical meaning. Therefore, the derived models carry practical value.(3) Unified equivalent models of basic DC-DC converters applies to Quasi Resonant Converter. Unified equivalent model is builded by modeling QRCs converter. Finally, through several examples, contrasting state-space averaging methods and A time averaging methods, the modeling and simulation methods presented in this paper have been tested and verfied. From the results, it can be concluded that the achievement of this paper has much application value, and can meet the modeling and simulation demands of DC-DC converters to a certain extent.