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Robust digital control of a DC–DC buck converter with low frequency samplings

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Abstract

A robust DC–DC converter which can covers extensive load change and also input voltage changes with one controller is needed. Then the demand to suppress output voltage change becomes still severer. We propose an approximate 2-degree-of-freedom (2DOF) digital controller which realized start-up response and dynamic load response independently. The controller makes a control bandwidth wider, and at the same time makes variations of the output voltage small at sudden changes of a load and an input voltage. In this paper, a new approximate 2DOF digital control system with additional zeros is proposed. Using the additional zeros, the second-order differential transfer characteristics between equivalent disturbances and a output voltage are realized. Therefore, the new controller makes variations of the output voltage smaller and the sudden changes of the load and the input voltage. This controller is actually implement on a DSP and is connected to the DC–DC converter. Experimental results demonstrate that this type of digital controller can satisfy given severe specifications with low frequency sampling.

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References

  1. Guo H, Shiroishi Y, Ichinokura O (2003) Digital PI controller for high frequency switching DC–DC converters based on FPGA. In: IEEE INTELEC03, pp 536–541

  2. Corradini L, Mattavelli P, Maksimovic D (2007) Robust relay-feedback based autotuning for DC–DC converters. In: IEEE PESC2008, pp 2196–2202

  3. Takegami E, Higuchi K, Nakano K, Watanabe K, Tomioka S (2005) The method for determined parameters of approximate 2DOF digital controller for robust control of DC–DC converter. In: ECTI-CON2005, pp 593–596

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Authors and Affiliations

  1. Department of Electronic Engineering, The University of Electro-Communications, Chofu, Tokyo, 182-8585, Japan

    Yuji Fukaishi, Yoshihiro Ohta & Kohji Higuchi

  2. TDK-LAMBDA K.K, 2701 Togawa, Settaya, Nagaoka, 940-1195, Japan

    Eiji Takegami & Satoshi Tomioka

  3. King Mongkut’s University of Technology Thonburi, 126 Pracha-utid Road Bangmod, Toongkru, Bangkok, Thailand

    Kosin Chamnongthai

Authors
  1. Yuji Fukaishi
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  2. Yoshihiro Ohta
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  3. Kohji Higuchi
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  4. Eiji Takegami
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  5. Satoshi Tomioka
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  6. Kosin Chamnongthai
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Corresponding author

Correspondence to Yuji Fukaishi.

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Fukaishi, Y., Ohta, Y., Higuchi, K. et al. Robust digital control of a DC–DC buck converter with low frequency samplings. Artif Life Robotics 17, 1–6 (2012). https://doi.org/10.1007/s10015-012-0008-6

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  • DOI: https://doi.org/10.1007/s10015-012-0008-6

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