Harmonic Analysis of Sliding-Mode-Controlled Buck Converters Imposed by Unmodeled Dynamics of Hall Sensor

DC–DC buck converters have become prominent components for energy optimization in power systems, and how to improve control performances is a challenging issue be addressed. In this paper, we aim investigate the harmonic problem of sliding mode (SM) controlled imposed by often-ignored unmodeled dynamics Hall sensor. The unified mathematical model whole system established combining SM controller, converter, sensor, where signal loss transmission process closed-loop considered. Based on Lyapunov stability theorem, controller designed guarantee stability, as well deduce stable working areas tuned parameters. Furthermore, introduce descriptive function (DF) approach influence sensor harmonics frequency domain, which can relationship between amplitude-frequency characteristics output Simulations experiments validate paper.