Current-Sensorless Robust Sliding Mode Control for the Interleaved DC-DC Boost Converter

Abstract

A current-sensorless, PWM-based robust sliding mode control strategy for the interleaved DC-DC boost converter is proposed, requiring only output-voltage measurement. An extended state estimator is developed to estimate the derivative of the output voltage alongside a lumped uncertainty term that comprises inductor parasitic resistance, component parameter uncertainties, load and input voltage variations. A linear sliding surface is then utilized to derive a controller that features a simple design yet exhibits excellent robustness against external disturbances, parameter variations, and parasitics, despite the absence of inductor current feedback. Additionally, a systematic step-by-step procedure to select the controller and estimator gains is outlined. The tracking performance and robust capabilities of the proposed control system are validated through comprehensive computer simulations.