Start-Up Control and Voltage Regulation in a Boost Converter Under Sliding-Mode Operation

This paper presents the analysis and design of a sliding-mode control of a boost converter operating in continuous conduction mode that minimizes the inrush current and provides output voltage regulation in front of input voltage perturbations and load changes. The analytical expression of the inrush current is obtained, and the conditions to minimize the current peak are derived. The resulting controller is implemented analogically and employs two switching surfaces. Namely, one surface is combined with the conventional auxiliary diode branch for the start-up, while another one is used for the voltage regulation in steady state. Experimental results are in perfect agreement with the theoretical predictions.

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