Open AccessCoupled‐inductor boost integrated flyback converter with high‐voltage gain and ripple‐free input current
Author(s) -
Chen Zhangyong,
Zhou Qun,
Xu Jianping
Publication year - 2015
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.2014.0066
Subject(s) - flyback converter , boost converter , buck–boost converter , buck converter , flyback diode , electrical engineering , inductor , snubber , flyback transformer , ripple , forward converter , electronic engineering , materials science , voltage , engineering , capacitor , transformer
DC–DC converters with high‐voltage gain and low‐input current ripple have attracted much attention in photovoltaic, fuel cells and other renewable energy system applications. Conventional boost–flyback converter can achieve high‐voltage set‐up ratio; however, its input current is pulsing and the voltage stress across output diode of flyback‐cell is high. In this study, by incorporating coupled‐inductor into the boost‐cell of boost–flyback converter, the voltage stress across the output diode is effectively reduced. Passive snubber circuit is utilised to suppress the voltage spike across power switch, low‐voltage‐rated metal–oxide semiconductor field effect transistor (MOSFET) with low R ds_on can thus be used to reduce the conduction loss of power MOSFET. In addition, ripple‐free input current can be achieved, which makes the design of electromagnetic interference filter easy. Steady‐state characteristics of the proposed converter are analysed, and experimental results are given to verify the analysis results.