Voltage controller of DC-DC buck converter using terminal sliding mode

This paper presents a novel terminal sliding mode (TSM) control scheme with double closed-loop structure of capacitor voltage and inductance current for the stability control of DC-DC buck converter. In order to satisfy the different performance demands of capacitor voltage and inductance current, a TSM controller and a linear sliding mode (LSM) controller is designed separately. For the former, TSM controller can track the given output voltage with fast response speed due to its finite time convergence and then output the reference inductance current; while for the latter, it can track the reference inductance current and then control the `on/off´ of the power switch. The stability condition in the case of power switch `on´ and `off´ can also be deduced. Simulation results with comparison of those of traditional single-loop LSM controller can validate the proposed scheme.