The aim of this paper is to present new results on the Buck converter control. The behaviour of the buck converter is described by the well-known average model and the control strategy is based on a double integral high gain control law including an estimation of current load. This control scheme rejects efficiently the disturbances introduced by the battery dynamics that depends on both the coil current and its charge level. Of particular interest, this nonlinear control algorithm ensures on the concerned open subset exponentially convergence of the state errors on the entire domain in a free disturbance case. The control law performances are evaluated regarding load and supply variations.
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