Open AccessAnalysis of low-frequency oscillation phenomenon in the pulsetrain controlled buck converter
Author(s) -
Jinping Wang,
Jianping Xu,
Guohua Zhou,
Mi Chang-bao,
Ming Qin
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.048402
Subject(s) - oscillation (cell signaling) , low frequency oscillation , capacitor , control theory (sociology) , voltage , buck converter , frequency domain , low frequency , physics , equivalent series resistance , phase portrait , computer science , power (physics) , thermodynamics , bifurcation , nonlinear system , control (management) , genetics , biology , electric power system , quantum mechanics , artificial intelligence , astronomy , computer vision
In this paper, the low-frequency oscillation phenomenon in a pulse train (PT) controlled buck converter operating in continuous conduction mode (CCM) is found and studied. The mechanism of this low-frequency oscillation phenomenon and the way to suppress it are studied. The time-domain simulation results and their corresponding phase portraits indicate that the equivalent series resistance (ESR) of the output filter capacitor has a critical effect on this low-frequency oscillation phenomenon. When the ESR is zero or small enough, such a low-frequency oscillation phenomenon appears in the PT controlled CCM buck converter because the output voltage can not be regulated timely. With the increase of ESR, the PT controlled CCM buck converter operates chaotically. The output voltage can be regulated timely and such a low-frequency oscillation phenomenon can be suppressed effectively. Experimental results are provided to verify the theoretical analyses and the simulations.