An Extended-State Observer Based on Smooth Super-Twisting Sliding-Mode Controller for DC-DC Buck Converters

This paper designs a novel smooth super-twisting extended-state observer (SSTESO)-based sliding-mode control (SSTSMC) scheme to promote the robust ability and voltage-tracking performance of DC-DC buck converters. First, an SSTESO is proposed estimate unknown lumped disturbance compensate for estimation voltage controller. The realized by constructing function replace nonlinear sign in STESO, which can provide faster convergence speed higher accuracy. SSTSM controller designed adopting similar further suppress chattering improve dynamic response. Comprehensive simulation results demonstrate that SSTESO-based SSTSMC robustness transient response converter system presence external parameter uncertainties.