Open AccessBidirectional DC–DC converter with series‐connected resonant tanks to realise soft switching
Author(s) -
Zhang Chao,
Gao Zhigang,
Liao Xiaozhong
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.2018.5311
Subject(s) - transformer , electrical engineering , voltage , engineering , forward converter , voltage regulation , switched mode power supply , topology (electrical circuits) , electronic engineering , boost converter
This study presents a new topology of a direct current (DC)–DC converter with series‐connected LLC resonant tanks to realise zero voltage switching and quasi‐zero current switching. Two LLC resonant tanks are connected in series on the low‐voltage side and complementarily implemented to balance the current in the transformers. Moreover, the transformers are connected in series to share the load voltage, thus, the size of each transformer can be reduced. A fully controlled H‐bridge on the high‐voltage side achieves bidirectional power transmission. The voltage stress on each power switch of the active H‐bridge is equal to the output voltage, rather than twice the conventional centre tapped topology. Besides, a high‐transformer ratio guarantees high‐DC voltage gain, which allows power supply under high‐voltage conditions. Furthermore, based on phase‐shift control, the output voltage can be regulated smoothly and continuously, and surplus power on the output side is transferred back to the power source automatically. The proposed converter can be applied as power supply cells in vehicles or motor‐controlled systems. Simulation with a 3000‐W prototype and laboratory experiments with a 90‐W prototype are carried out to verify the feasibility and efficiency of the proposed converter.