Implementation of sliding mode backstepping controller for boost converter in real‐time for LED application

Abstract

This paper describes the real-time implementation of a sliding mode backstepping controller for boost converters for LED lighting applications. The sliding surface is used to calculate the first error value in the backstepping control procedure, which ensures the system's robustness over a wide range of disturbances by achieving an asymptotically stable system based on the Lyapunov function. Due to the nonminimum phase nature of boost converter, the system will become unstable. Hence the output voltage is indirectly controlled by controlling the sliding surface in the proposed sliding mode backstepping controller in order to achieve the asymptotically stable system. The detailed simulation is carried out on the MATLAB/Simulink platform, and the results are compared to that of a conventional proportional-integralderivative (PID) controller and a traditional sliding mode controller, which ensures system robustness across a wide range of load resistance and input voltage changes, resulting in enhanced transient and, steady-state responses. In the laboratory, a prototype of proposed controller is designed to ensure its accuracy in real-time. By comparing the proposed control technique to the conventional sliding mode controller and PID controller, the flexibility of the proposed control method is validated for any variation at the input and output sides. From the experimental results, it is apparent that the proposed controller responds accurately and rapidly regardless of the disturbances caused to the system.

Sliding-mode control for boost converters under voltage and load variations

“…Hence, artificial intelligence-based algorithms or fuzzy logic control with SMC were proposed to overcome the demerits of the variable switching frequency. The control guarantees that the output voltage is regulated, and the fast dynamic response of the input and output currents is maintained by a genetic algorithm [4]- [8]. Power converters have many control methods,  ISSN: 2088-8694 such as inductor voltage loss integration, inductor current prediction, and state observation.…”