Universal Digital Sliding Mode Control for DC-DC Converters
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Recent research in the field of DC-DC converters revealed a huge potential for the nonlinear control technique Sliding Mode Control (SMC). Various state-of-the art publications, e.g. ?, only consider an analog controller implementation, since a feasible digital implementation is not straightforward. In this paper, a digital sliding mode controller for DC-DC converters is presented. In order to be applicable for different converter topologies and operation modes, information of the inductor current is used as an input for control. Hence, the required current has to be sensed or estimated. The digital sliding mode algorithm is implemented in a simulation environment, where the system parameters are chosen to represent a realistic Power Management Unit (PMU) for a mobile device. Results of the simulations are presented for a Buck converter operating in Continuous Conduction Mode (CCM). Based on the simulations it is shown that the proposed digital control algorithm achieves a small voltage ripple in steady-state, and an excellent dynamic performance under different operation conditions.