High-Performance Programmable AC Signal Power Amplifier Using DSP-Based Discrete-Time Sliding Mode Control Technique

This paper presents a discrete-time sliding mode controlled current-source inverter (CSI) system used in AC signal power amplifier. A discrete-time sliding mode controller based on a novel reaching condition is adopted, which can force the state vectors into the sliding domain quickly and reduce the chattering of the system greatly. The sliding domain and the sliding surface coefficient are analyzed to ensure that the system will converge to zero asymptotically and keep stable. The proposed control strategy provides excellent robustness with regard to external disturbances, and well steady state operation and dynamic response of the output current. Final experimental results are demonstrated to validate the theoretical design.