Abstract
This paper deals with the output voltage regulation problem for dc-dc buck converters. Overcurrent protection and disturbances are both taken into consideration. The main challenge of control design is how to ensure that the current constraints are not violated at any time in the presence of disturbances. At first, a high-gain disturbance observer is utilized to estimate the disturbances. Then, a novel punishment mechanism for the inductor current is designed in the control scheme. Finally, based on the novel current-constrained technique and the high-gain disturbance observer, a composite control approach is proposed. The new control method not only guarantees the current within the required range but also has a nice ability on the disturbance rejection. In the meantime, rigorous stability proof is also presented. The theoretical analysis also explains how disturbances affect the satisfaction of the current constraints. The experimental results on a buck converter system are illustrated to verify the feasibility and effectiveness of the proposed control scheme.
Highlights
Due to the hardware limitations and safety consideration, almost all control systems have state constraints [1], [2]
Inspired by [16] and [23], the output voltage regulation problem for DC-DC buck converter is discussed in this paper
Remark 2: In this paper, the output voltage regulation problem for DC-DC buck converter control system is considered under non-cascading structure
Summary
Due to the hardware limitations and safety consideration, almost all control systems have state constraints [1], [2]. Throughout the control design process, it does not rely on the energy function, but the key is to design a suitable penalty term (i.e., the nonlinear gain of the constrained state) This control design idea has been successfully applied to DC-DC buck converter to solve its overcurrent protection problem [16]. Inspired by [16] and [23], the output voltage regulation problem for DC-DC buck converter is discussed in this paper. Both the current constraint and disturbances are taken into account. By taking advantage of the idea in [16] and the HGDOB, a new composite control approach is presented
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