Adaptive nonlinear control of DC-DC buck/boost converters with parasitic elements consideration

In this paper, a novel approach based on Adaptive Backstepping is proposed for designing current controller in buck/boost DC to DC converter. This method is based on more accurate modeling of converter considering effect of circuit parasitic elements, better modeling of semiconductor switches and accounting for equivalent series resistance of inductor. Also, during controller designing process, load resistance has been assumed to be uncertain and an appropriate estimate of this parameter has been done by choosing a suitable Lyapunov function. Simulation results show clearly that designed controller has fast dynamic response and no steady-state error problem. The proposed method can stabilize the converter during wide variation of load resistance as well.