Bi-Stability Phenomenon in Constant On-Time Controlled Buck Converter With Small Output Capacitor ESR

Zhang, Xi, Bao, Bocheng, Bao, Han, Wu, Zhimin and Hu, Yihua ORCID: 0000-0002-1007-1617 (2018) Bi-Stability Phenomenon in Constant On-Time Controlled Buck Converter With Small Output Capacitor ESR. IEEE ACCESS, 6. pp. 46227-46232.

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Official URL: http://dx.doi.org/10.1109/access.2018.2866124

Abstract

This paper reports the finding of bi-stability phenomenon in a constant on-time (COT) controlled buck converter with a small output capacitor equivalent series resistance (ESR). In the previously published literatures, it has been reported that the COT controlled buck converter with a small output capacitor ESR operates in the reduced-frequency periodic oscillation state. However, it is newly validated by numerical simulations that for some specified initial states, such a buck converter with the same circuit parameters can operate in a chaotic oscillation state as well, reflecting the existence of bi-stable oscillation states. Based on the piecewise continuous model of COT controlled buck converter, the bi-stability phenomenon associated with two sets of initial states is revealed by numerical simulations and verified by PSIM circuit simulations. Consequently, when a small output capacitor ESR is used, the coexisting attractors' behavior of two bi-stable oscillation states appears in such a COT controlled buck converter, leading to the emergence of bi-stability phenomenon.

Item Type:	Article
Uncontrolled Keywords:	Constant on-time (COT) control, buck converter, equivalent series resistance (ESR), bi-stability
Depositing User:	Symplectic Admin
Date Deposited:	05 Sep 2018 09:17
Last Modified:	17 Mar 2024 00:22
DOI:	10.1109/ACCESS.2018.2866124
Open Access URL:	https://ieeexplore.ieee.org/document/8439942/
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3025881