Linear state-feedback control of a boost converter for large-signal stability

The problem of stabilizing a boost regulator in large-signal situations usi ng linear control laws is derived by means of a circuit-oriented procedure. After establishing a large-signal circuit model for the boost regulator in cluding state-feedback, conditions for passivity in the resulting two-port are studied. As a consequence, a linear control law is derived, thus ensuri ng regulator global stability even if the control saturation is taken into account. Subsequently, a linear analysis is performed, in order to design t he desired dynamics and robust behavior of the switching regulator. The non linear analysis shows that only one feedback gain is necessary, provided th at the coordinates of the equilibrium point are known. The use of regulator root locus allows to choose the proper value of this gain. Simulations and experimental results verify the analytical predictions.