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

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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 non‐minimum 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‐integral‐derivative (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.

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