Open AccessCritical output‐capacitor ESR for stability of V 2 controlled buck converter in CCM and DCM
Author(s) -
Zhou Guohua,
He Shengzong,
Zhang Xi,
Zhong Shu
Publication year - 2014
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2014.0419
Subject(s) - capacitor , buck converter , control theory (sociology) , duty cycle , inductor , equivalent series resistance , converters , instability , physics , materials science , voltage , power (physics) , mechanics , computer science , electrical engineering , engineering , thermodynamics , control (management) , artificial intelligence
It has been reported that subharmonic instability exists in the V 2 controlled buck converter in continuous conduction mode (CCM) when the duty ratio is above 0.5 ( D > 0.5) and no stability issue exists in discontinuous conduction mode (DCM) when 0 < D < 1. However, the CCM and DCM instabilities will appear in the safe duty ratio range when the equivalent series resistance (ESR) of the output capacitor is below a critical value. The critical output‐capacitor ESR for the stabiiity of a V 2 controlled buck converter in CCM and DCM is investigated by using the discrete‐time model and verified by circuit simulations.