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Comparative study of digital control schemes for interleaved multi-phase buck converters

Vergleichsstudie digitaler Regelkonzepte für mehrphasige Abwärtswandler

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Abstract

The increasing amount of required functionality in today’s electronic devices demands for more advanced power supply concepts. A possible solution to increase the performance and efficiency of DC-DC converters is to use multi-phase topologies. These converters employ multiple parallel power stages, hence sharing the total load current. In order to provide a regulated output voltage and equal sharing of the total current, a control loop is an essential part of such a converter. This paper presents three digital control schemes for multi-phase buck converters, namely, a linear voltage mode controller, a combined Ton/Toff control and a non-linear sliding mode control (SMC) law. Experimental results of a two-phase buck converter highlight the effectiveness of more sophisticated controllers and the benefits of multi-phase over single-phase converters.

Zusammenfassung

Die steigende Anzahl an benötigten Funktionen in heutigen elektronischen Geräten verlangt nach fortgeschritteneren Energieversorgungskonzepten. Eine Möglichkeit, die Performanz und Effizienz von Gleichspannungswandlern zu verbessern, ist der Einsatz von mehrphasigen Topologien. Durch die Verwendung von mehreren parallelen Leistungsstufen wird der von der Last benötigte Strom aufgeteilt. Um sowohl eine geregelte Ausgangsspannung als auch eine gleichmäßige Verteilung des benötigten Stroms zu ermöglichen, ist es wichtig, den Wandler geregelt zu betreiben. In dieser Arbeit werden drei digitale Regelkonzepte für mehrphasige Abwärtswandler vorgestellt: ein linearer Regler basierend auf der Ausgangsspannung, eine kombinierte Ton/Toff-Regelung sowie ein nichtlinearer Sliding Mode-Regler. Die Effizienz von fortgeschrittenen Regelkonzepten sowie die Vorteile von mehrphasigen Systemen werden anhand von Messergebnissen eines zweiphasigen Abwärtsreglers aufgezeigt.

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Authors and Affiliations

  1. Infineon Technologies Austria AG, Siemensstraße 2, 9500, Villach, Austria

    Marc Kanzian, Harald Gietler, Matteo Agostinelli & Robert Priewasser

  2. Institute of Signal Processing, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040, Linz, Austria

    Mario Huemer

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  1. Marc Kanzian
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  2. Harald Gietler
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  3. Matteo Agostinelli
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  4. Robert Priewasser
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  5. Mario Huemer
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Correspondence to Marc Kanzian.

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Kanzian, M., Gietler, H., Agostinelli, M. et al. Comparative study of digital control schemes for interleaved multi-phase buck converters. Elektrotech. Inftech. 135, 54–60 (2018). https://doi.org/10.1007/s00502-017-0574-3

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