Adaptive Digital Predictive Peak Current Control Algorithm for Buck Converters

Yu Zhang; Yiming Zhang; Xuhong Wang; Wenhao Zhu

Adaptive Digital Predictive Peak Current Control Algorithm for Buck Converters

Vol. 19, No. 3, pp. 613-624, May 2019

10.6113/JPE.2019.19.3.613

Adaptive control

Buck converter

Parameter identification

Peak current control

Predictive algorithm

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Abstract

Digital current control techniques are an attractive option for DC-DC converters. In this paper, a digital predictive peak current control algorithm is presented for buck converters that allows the inductor current to track the reference current in two switching cycles. This control algorithm predicts the inductor current in a future period by sampling the input voltage, output voltage and inductor current of the current period, which overcomes the problem of hardware periodic delay. Under the premise of ensuring the stability of the system, the response speed is greatly improved. A real-time parameter identification method is also proposed to obtain the precision coefficient of the control algorithm when the inductance is changed. The combination of the two algorithms achieves adaptive tracking of the peak inductor current. The performance of the proposed algorithms is verified using simulations and experimental results. In addition, its performance is compared with that of a conventional proportional-integral (PI) algorithm.

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Cite this article

[IEEE Style]

Y. Zhang, Y. Zhang, X. Wang, W. Zhu, "Adaptive Digital Predictive Peak Current Control Algorithm for Buck Converters," Journal of Power Electronics, vol. 19, no. 3, pp. 613-624, 2019. DOI: 10.6113/JPE.2019.19.3.613.

[ACM Style]

Yu Zhang, Yiming Zhang, Xuhong Wang, and Wenhao Zhu. 2019. Adaptive Digital Predictive Peak Current Control Algorithm for Buck Converters. Journal of Power Electronics, 19, 3, (2019), 613-624. DOI: 10.6113/JPE.2019.19.3.613.