This paper presents an alternative modulation approach for digitally controlled DC-DC switching converters, which exploits the natural jittering activity of a digital hysteretic feedback loop in order to provide an effective increase in resolution. The proposed structure replaces conventional highresolution digital pulse-width modulators (DPWM) or sigmadelta based (ΣΔ-DPWM) solutions with a single, fully-digital block featuring reduced complexity, high resolution, and improved noise performance and small-signal dynamic characteristics, enabling the design of accurate, high-bandwidth digital feedback loops with minimum hardware resources. A stochastic modeling approach is developed for the proposed structure, which allows the derivation of a simple and effective switching frequency control criterion. Analysis, simulation and experimental tests are shown to validate the properties of the proposed digital hysteretic modulator.

Fully Digital Hysteretic Modulator for DC-DC Switching Converters

CORRADINI, LUCA;
2009

Abstract

This paper presents an alternative modulation approach for digitally controlled DC-DC switching converters, which exploits the natural jittering activity of a digital hysteretic feedback loop in order to provide an effective increase in resolution. The proposed structure replaces conventional highresolution digital pulse-width modulators (DPWM) or sigmadelta based (ΣΔ-DPWM) solutions with a single, fully-digital block featuring reduced complexity, high resolution, and improved noise performance and small-signal dynamic characteristics, enabling the design of accurate, high-bandwidth digital feedback loops with minimum hardware resources. A stochastic modeling approach is developed for the proposed structure, which allows the derivation of a simple and effective switching frequency control criterion. Analysis, simulation and experimental tests are shown to validate the properties of the proposed digital hysteretic modulator.
2009
Proc. 1st IEEE Energy Conversion Conference and Exposition (ECCE 2009)
9781424428939
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/180488
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