Tracking control of buck converter using sliding-mode with adaptive hysteresis

This paper introduces an application of sliding-mode combined with state-feedback tracking principle to control a buck converter. Instead of following an empirical method to obtain the sliding surface equation for the on-off bang-bang switching, the derivation of the control law is completely based an the fundamental tracking control laws, using the state-feedback and bang-bang control approaches. The resulting equation, if being reduced for the case of having a constant voltage reference, is similar to the sliding equation used in previous work. The control concept has proven to be more general, and can be applied to the case of having the output voltage tracking a time-varying reference signal