Open AccessIsolated bidirectional converter with minimum active switches for high‐voltage ratio achievement and micro‐grid applications
Author(s) -
Shen ChihLung,
Shen YouSheng,
Chiu PoChieh,
Liang TsairChun
Publication year - 2017
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.2017.0269
Subject(s) - leakage inductance , flyback converter , buck–boost converter , forward converter , ćuk converter , inductor , duty cycle , transformer , boost converter , capacitor , electrical engineering , buck converter , grid , electronic engineering , inductance , voltage , computer science , engineering , mathematics , geometry
This study proposes a novel isolated bidirectional DC/DC converter for micro‐grid system, which can fulfil battery charging and discharging. Even though the proposed converter only employs four active switches and a coupled inductor, it can achieve high‐voltage ratio without excessive duty ratio or high transformer turns ratio. The power stage of the converter is mainly developed by integrating a three‐winding coupled inductor, three‐switched capacitors, and a flyback‐behaviour converter into a novel structure. The energy stored in the leakage inductance can be totally recycled for efficiency improvement. The operation principle, steady‐state analysis, and design considerations of the proposed converter are described in detail. Finally, a laboratory prototype is built to validate the converter. The measured results have verified the correctness and the theoretical analysis.