Open AccessDual‐transformer soft‐switching DC–DC resonant converter with multiple resonant elements
Author(s) -
Wang Yifeng,
Han Fuqiang,
Yang Liang,
Wang Chengshan,
Zhou Biao
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.2018.5650
Subject(s) - transformer , forward converter , diode , electrical engineering , resonant converter , voltage , flyback converter , electronic engineering , materials science , boost converter , engineering
A novel dual‐transformer DC–DC converter with multiple resonant elements is proposed. Owing to the multi‐resonant feature, the converter is able to achieve a wide DC voltage gain range through the proper selection of resonant parameters. The operating frequency is restricted within a narrow scope. The potential high‐frequency losses are avoided, which apparently contributes to efficiency improvement. Besides, since the proposed converter contains more resonant frequencies, it is possible to additionally transmit the third‐order active power to the load. All the power switches have realised the turn‐on soft‐switching, while the diodes obtain the soft‐switching or quasi‐soft‐switching for both the turn‐on and turn‐off periods. To verify the theoretical analyses, a 500 W prototype is established in the laboratory. The experimental results demonstrate that the proposed converter can maintain relatively high efficiency (∼95%) among a wide load range. The highest efficiency reaches 95.4% at 300 W.