Open AccessA transformerless modular step‐up dc–dc converter for high power applications
Author(s) -
Filsoof Kia,
Hagar Abdelrahman A.,
Lehn Peter W.
Publication year - 2014
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.2013.0409
Subject(s) - ćuk converter , forward converter , modular design , buck–boost converter , flyback converter , boost converter , electronic engineering , capacitor , transformer , buck converter , computer science , inductor , electrical engineering , voltage , engineering , topology (electrical circuits) , operating system
This study presents a new step‐up dc–dc converter topology suitable for medium voltage, megawatt scale applications. The proposed converter interconnects unipolar or bipolar dc networks using a single inductor and a modular active switching network. The active switching network contains multiple series‐connected identical converter modules. Each module consists of four switches and one capacitor. The modular nature of the switching network allows scalable implementation of the converter, and utilisation of low‐voltage switches and capacitors. The proposed converter avoids the use of medium‐frequency isolation transformers. Soft switching is utilised to reduce the converter's switching losses. An analytical model of the converter is developed to facilitate converter design. Theoretical predictions are supported by a 7.6 kW scaled laboratory prototype achieving an efficiency of as high as 93.2%.