Analysis and Design of Sensor-Driver-Aware Integral Nonsingular Terminal Sliding Mode Control for Buck Converter
Weiqi Zhang1, Fan Ping2, Yingbo Han3
1School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China.
Micromachines
|July 28, 2026
Summary
This study introduces a new control method for buck converters, improving voltage stability in microsystems despite disturbances. The integral nonsingular terminal sliding mode control (INTSMC) ensures robust performance and fast response.
Area of Science:
- Electrical Engineering
- Control Systems
- Power Electronics
Background:
- Buck converters are crucial for voltage regulation in microsystems but face challenges from parameter variations and sensor-driver dynamics.
- Conventional controllers struggle with signal distortion, delayed actions, and degraded transient response due to these practical limitations.
- Robust power regulation in micro-actuator systems requires addressing multi-source disturbances and non-ideal feedback paths.
Purpose of the Study:
- To develop and analyze a sensor-driver-aware integral nonsingular terminal sliding mode control (INTSMC) method for buck converters.
- To enhance voltage tracking performance and ensure singularity-free reaching in the presence of various disturbances.
- To provide a digitally implementable control law and a method for analyzing system response time.
Main Methods:
- A control-oriented averaged model was created, integrating converter parameter perturbations, load disturbances, Hall sensor dynamics, and driver characteristics.
- An integral nonsingular terminal sliding surface was designed for improved voltage regulation and singularity avoidance.
- A phase-trajectory-based response-time estimation method was developed to analyze system dynamics.
Main Results:
- The proposed INTSMC method demonstrated robust performance under multi-source disturbances.
- Achieved a settling time within 33 ms and a steady-state voltage error within 0.01 V.
- Measured efficiency ranged from 83.5% to 88.9%, confirming practical feasibility.
Conclusions:
- The sensor-driver-aware INTSMC method offers effective and robust voltage regulation for buck converter power interfaces in microsystems.
- The controller is suitable for digital implementation and accounts for critical sensor-driver dynamics.
- The findings are significant for micro-actuator-oriented microsystems requiring stable power supply under challenging conditions.
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