Modified SEPIC boost converter with constant switching frequency modulation using sliding mode controller

Official URL: https://dx.doi.org/10.1109/ICIT.2018.8352276

This paper presents a sliding mode control (SMC) approach to a novel high output gain SEPIC converter. Power circuit of the conventional SEPIC converter is modified with an inclusion of single inductor and capacitor which improves the efficiency and output gain. Conventional PI type controllers are very common solutions for DC-DC converters. However, it is a difficult task to optimize a single PI controller gain in different loads and disturbances. Proposed SMC based equivalent controller implemented on the modified SEPIC converter overcomes these aforementioned drawbacks. A dynamic hysteresis constant switching frequency method is attempted to operate in the appropriate switching frequency interval. The proposed circuit and controller structure are validated in Matlab/Simulink under different perturbations.