Dynamical Effects of Equivalent Series Resistance of Output Capacitor in Constant On-Time Controlled Buck Converter

Dynamical Effects of Equivalent Series Resistance of Output Capacitor in Constant On-Time Controlled Buck Converter

Equivalent series resistance (ESR) of output capacitor has a significant effect on the control performance of constant on-time (COT) controlled switching dc-dc converters. In this paper, a discrete-time model of COT-controlled buck converter, with variable sampling frequency, is established. Based u...

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Veröffentlicht in:IEEE transactions on industrial electronics (1982) 2013-05, Vol.60 (5), p.1759-1768
Hauptverfasser: Wang, Jinping, Bao, Bocheng, Xu, Jianping, Zhou, Guohua, Hu, Wen
Format: Artikel
Sprache:eng
Schlagworte:
Bifurcation
buck converter
Capacitors
constant on-time (COT)
discrete-time model
Equations
equivalent series resistance (ESR)
Inductors
Mathematical model
stability
Switches
Voltage control
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container_issue 5
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container_title IEEE transactions on industrial electronics (1982)
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creator Wang, Jinping
Bao, Bocheng
Xu, Jianping
Zhou, Guohua
Hu, Wen
description Equivalent series resistance (ESR) of output capacitor has a significant effect on the control performance of constant on-time (COT) controlled switching dc-dc converters. In this paper, a discrete-time model of COT-controlled buck converter, with variable sampling frequency, is established. Based upon which, the dynamical effects of the ESR of output capacitor on COT-controlled buck converter are revealed and analyzed. The time-domain numerical simulations of the exact switched state equations, the bifurcation diagrams, and maximal Lyapunov exponents of the discrete-time model are obtained. These results verified by experimental circuit indicate that the ESR of output capacitor is a critical factor for COT-controlled buck converter, which can eliminate the unique pulse bursting phenomenon and shift operation mode from discontinuous conduction mode to continuous conduction mode, as well as control stability.
doi_str_mv 10.1109/TIE.2012.2190956
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subjects Bifurcation
buck converter
Capacitors
constant on-time (COT)
discrete-time model
Equations
equivalent series resistance (ESR)
Inductors
Mathematical model
stability
Switches
Voltage control
title Dynamical Effects of Equivalent Series Resistance of Output Capacitor in Constant On-Time Controlled Buck Converter
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