Open AccessParallel‐connected buck converters controlled by capacitor current feedback based PT with current‐sharing ability
Author(s) -
Geng Yisen,
Yu Dongsheng,
Xia Zhenglong,
Xu Ruidong
Publication year - 2018
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.2018.5627
Subject(s) - converters , control theory (sociology) , buck converter , inductor , capacitor , computer science , oscillation (cell signaling) , voltage , electronic engineering , engineering , electrical engineering , control (management) , artificial intelligence , biology , genetics
Parallel‐connected power converters have been widely used in the application scenarios required high power to deal with the high load current. In this study, the pulse train (PT) controller with the advantages of fast response speed and simple structure is newly applied to the parallel‐connected buck converters with current‐sharing ability. However, as the converters operated in continuous conduction mode, undesirable low‐frequency voltage oscillation will be brought about by the PT control method. To resolve this problem, a novel capacitor‐current‐feedback‐based PT (CCF‐PT) control method is proposed to eliminate the low‐frequency oscillation of the parallel‐connected buck converters. The approximate discrete time model of the CCF‐PT‐controlled buck converters is established, and the bifurcation diagrams of output voltage and inductor current changing along with the current scale factor, the capacitor‐current‐feedback coefficient and the load resistance are drawn to show the operation stability of the converters. Simulation and experimental results are obtained, which indicate that the proposed parallel‐connected buck converters with CCF‐PT control have excellent performance such as fast response, wide load range and effective suppression of low‐frequency oscillation.