Open AccessResearch of the adaptive control on modulation factor for PSR fly‐back PSM converter
Author(s) -
Tian Lei,
Li Qinqin,
Wang Weiheng
Publication year - 2019
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.2017-0319
Subject(s) - control theory (sociology) , modulation (music) , comparator , converters , power factor , pulse width modulation , power (physics) , engineering , electronic engineering , voltage , computer science , control (management) , physics , electrical engineering , artificial intelligence , acoustics , quantum mechanics
The energy balance ( EB ) model of a primary side regulation ( PSR ) fly‐back converter in the discontinuous conduction mode ( DCM ) is discussed in this paper. Based on this EB model, the stability of a PSR fly‐back converter in the pulse skipping mode ( PSM ) is analyzed, and a self‐adapting modulation factor control strategy is proposed. Theoretical analysis and simulation results show that by saving an optocoupler and correlative circuits, which are necessary in traditional PSM fly‐back converters, the modulation factor tolerance controlled by this method is 1.26% on average, corresponding to the ideal value. Compared with traditional fly‐back PSM controllers, the power saved in the sampler/comparator modules is 87% on average for a load range of 1 Ω to 1 kΩ.