Open AccessOne‐comparator counter‐based controller for synchronous DC/DC converters
Author(s) -
Aldhaher Samer,
Whidborne James F.,
Luk Patrick ChiKwong
Publication year - 2014
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2013.0634
Subject(s) - comparator , converters , ripple , control theory (sociology) , controller (irrigation) , buck converter , successive approximation adc , generator (circuit theory) , voltage , computer science , digital control , pulse width modulation , electronic engineering , power (physics) , engineering , physics , electrical engineering , control (management) , agronomy , quantum mechanics , artificial intelligence , biology
A low complexity, low component‐count digital controller consisting of a single comparator and a digital counter is proposed for the purpose of providing control and voltage regulation for synchronous buck DC/DC converters used in voltage ripple insensitive applications. The system is modelled and analysed based on an averaged‐circuit representation of the buck converter including the parasitic resistances of its passive and active components. The existence of limit cycles is investigated by using a describing function to represent the comparator and the pulse‐width modulated generator. The simulation results are presented and are verified with experimental results for a 36 W prototype. The validity of the predicted performance of the proposed controller for higher loading conditions is thus confirmed.