Inductor current estimation based sensorless control of boost type DC-DC converter

This paper presents a nonlinear fast terminal sliding mode control approach for a two-phase interleaved boost converter (2PIBC), emphasizing the utilization of inductor current estimation for achieving current sensorless control. The proposed approach introduces a state and disturbance estimation algorithm (SDEA) to effectively estimate the inductor current, external disturbances, system parameter uncertainties, and unmodeled dynamics within a 2PIBC. The combination of the proposed controller and SDEA enhances the robustness of 2PIBC, enabling it to track the desired reference voltage accurately. The stability of the proposed scheme is rigorously demonstrated through the application of Kharitono's stability criteria. Furthermore, extensive simulations have been conducted to compare the response of the proposed controller with other state-of-the-art sensorless controllers. Finally, the hardware results are shown to validate and ensure the feasibility of the proposed work. © 2024 Elsevier Ltd