Adaptive control of PWM Dc-to-Dc converters operating in continuous conduction mode

This paper presents the application of adaptive control to PWM Dc-to-Dc Converter Operating in Continuous Conduction Mode. The system under study is a buck-boost with parasitic as non linear and variable structure plant. First the model of converter is discussed; the non linearity is handled with state space averaged modeling into the linear time-varying representation; one adopted consequently an on-line identification of the converter parameters which rests on the exploitation of the Recursive Least Squares (RLS) algorithm to take into account great variations of the operating point, and the controller adaptation is based on a pole placement strategy. The synthesis of the regulator lends particularly well to be put under the shape of an intelligent algorithm which the self-tuning can be elaborated on-line.