This paper investigates the stability properties of digital predictive current-mode control (DPCMC) of three-level flying capacitor Buck converters (3LFC) operated in single-sampling and multi-sampling mode. While DPCMC has been extensively studied for basic dc-dc topologies, a dedicated analysis is required when it comes to multi-level converters due to the interaction between the predictive control law and the flying-capacitors (FC) voltage dynamics. This work clarifies the operating point-dependent and load-dependent stability properties of average and valley DPCMC and combines them with recently published results for peak DPCMC in order to provide a comprehensive picture for these types of digital controllers. The developed analysis is validated through simulations and experimentally on a low-voltage 500kHz, 12V-to-1.5V, 500mA 3LFC-Buck prototype.

Stability Properties of Digital Predictive Current-Mode Controllers for Three-level Flying Capacitor Converters

Bonanno G.;Corradini L.
2020

Abstract

This paper investigates the stability properties of digital predictive current-mode control (DPCMC) of three-level flying capacitor Buck converters (3LFC) operated in single-sampling and multi-sampling mode. While DPCMC has been extensively studied for basic dc-dc topologies, a dedicated analysis is required when it comes to multi-level converters due to the interaction between the predictive control law and the flying-capacitors (FC) voltage dynamics. This work clarifies the operating point-dependent and load-dependent stability properties of average and valley DPCMC and combines them with recently published results for peak DPCMC in order to provide a comprehensive picture for these types of digital controllers. The developed analysis is validated through simulations and experimentally on a low-voltage 500kHz, 12V-to-1.5V, 500mA 3LFC-Buck prototype.
2020
Proc.35th IEEE Applied Power Electronics Conference and Exposition (APEC 2020)
978-1-7281-4829-8
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3345889
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