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Experimental validation of dithered sliding mode control for switched systems

Boundary layer approach represents a classical solution for chattering mitigation in the implementation of sliding mode control systems. Dithering is here proposed as a technique for the regulation of the boundary layer in switched systems for which the natural on-off behaviour must be preserved. Power converters represent an interesting class of such systems. Experimental results on a DC/DC buck converter show that dither can play an important role for stability and robustness of the controlled converter. It is shown that dithering maintains the state of the system close to the ideal sliding manifold and that boundary layer and practical stability depend on the dither amplitude, period and shape