PWM-SWITCH MODELING OF DC-DC CONVERTERS

The introduced PWM-switch modeling method is a simple method for model ing pulse-width-modulated (PWM) de-de converters operating in the cont inuous conduction mode. The main advantage of this method is its versa tility and simple implementation compared to other methods. The basic idea is the replacement of the switches in the converter by their time -averaged models. These switch models have been developed in such a wa y that the converter model provides the same results as the state-spac e-averaging technique but now including nonlinear effects. Simple rule s for determination of the switch models are obtained. The resulting m odel is a time-averaged equivalent circuit model where all branch curr ents and node voltages correspond to their averaged values of the corr esponding original currents and voltages. The model also includes para sitics, second-order effects and nonlinearities, and can be implemente d in any circuit-oriented simulation tool. The same model is used for the simulation of the steady-state and the transient behavior.