Terminal Sliding Mode Control of DC-DC Buck Converter Based on Disturbance Observer

This paper proposes a terminal sliding mode control of DC-DC buck converter based on disturbance observer. At first, a disturbance observer is devised to estimate disturbances with unknown disturbance structure. And a novel terminal sliding function incorporated with disturbance estimation is constructed, which can not only reduce the chattering effectively but also make the state converge to the equilibrium point in a finite time. Then a terminal sliding mode controller is designed to make the system state can reach the sliding surface in a finite time. Finally, an experimental platform is established, and the simulation and experimental results verify the effectiveness of the control method.