Finite-time output feedback control for a class of second-order nonlinear systems with application to DC-DC buck converters

The problem of output feedback control for a class of second-order nonlinear systems is investigated in this paper. Using the techniques of finite-time control and finite-time convergent observer, an observer-based finite-time output feedback controller is proposed which can guarantee that the system's state converges to the equilibrium in a finite time. As an application of the proposed theoretical results, the problem of finite-time control without current signal for the DC-DC buck converters is solved. Simulation results are given to demonstrate the effectiveness of the proposed method.