MODELING AND ANALYSIS OF A DC-DC BOOST-BUCK CONVERTER FOR RENEWABLE ENERGY APPLICATIONS

In this paper a small-signal modeling of the DC-DC boost-buck converter is presented, whose attractive feature is that both input and output currents can be controlled through different duty cycles applied in each leg, which defines the proposed modulation strategy. This switching sequence is composed of three different states, which gives the basics to obtain the equivalent small-signal equations, the equivalent small-signal circuit and the transfer functions of the converter. Simulation results validate the model through time domain responses and frequency domain.