Adaptive Integral-Type Non-Singular TSMC for Buck Converters with Zero-Crossing Control Gain under Matched and Mismatched Disturbances

Aiming to improve the performance of general buck converters in complex disturbance environments, an adaptive integral-type non-singular terminal sliding mode (AINTSM) control method with zero-crossing control gain is proposed in this paper. In contrast to conventional linear sliding mode (LSM) and NTSM methods with fixed gain, the proposed AINTSM approach maintains a simple structure while effectively mitigating chattering due to the adaptive gain and overcoming singularity issues associated with global convergence. Initially, an accurate model is developed incorporating bounded matched and mismatched disturbances; Subsequently, an AINTSM controller is designed by integrating an integral error regulation with an adaptive zero-crossing gain, and global finite-time convergence is achieved by Lyapunov-based analysis; Furthermore, the impact of variations in control parameters on the system's dynamic and static performance is analyzed, with stability conditions for the AINTSM parameters clarified by phase trajectory analysis. Finally, numerical simulations and experimental findings under parameter disturbances verify the efficacy of the proposed method.