The problem of current sharing controller for parallel dc–dc buck converter system is investigated in this paper. Specifically, to achieve the goal of sharing control and improve the systems dynamic performance, a new finite-time current sharing control algorithm is designed and employed. Under the proposed control algorithm, rigorous proofs show that not only the output voltage of the converter system can reach the desired reference voltage in a finite time, but also the objective of current sharing can be achieved within almost the same time. In addition, when the external load is time-varying and unknown, a finite-time load estimator is given to handle the load variation, and an adaptive finite-time current sharing control algorithm is subsequently developed. Experimental results are presented to verify the effectiveness of the proposed method, and to show its advantages over some traditional control algorithms. It is shown that a faster convergence rate and a better load disturbance rejection performance can be yielded by the present algorithm. Finally, it is shown that the main results can be extended to the case of $n$ parallel dc–dc buck converters.

中文翻译：

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基于有限时间控制技术的并联DC-DC Buck变换器的均流控制

本文研究了并联直流-直流降压转换器系统中的均流控制器问题。具体地，为了达到共享控制的目的并提高系统的动态性能，设计并采用了一种新型的限时电流共享控制算法。在提出的控制算法下，严格的证明表明，不仅转换器系统的输出电压可以在有限的时间内达到所需的参考电压，而且几乎可以在同时达到均流的目的。此外，当外部负载随时间变化且未知时，给出了有限时间负载估计器来处理负载变化，随后开发了一种自适应有限时间均流控制算法。实验结果表明，该方法是有效的。并展示其相对于某些传统控制算法的优势。结果表明，该算法可以实现更快的收敛速度和更好的负载干扰抑制性能。最后，结果表明，主要结果可以扩展到$ n $并联dc-dc降压转换器的情况。