Open AccessNon‐isolated bidirectional DC–DC converters with multi‐converter functionality employing novel start‐up and mode transition techniques
Author(s) -
Sharma Ambuj,
Nag Soumya Shubhra,
Bhuvaneswari Gurumoorthy,
Veerachary Mummadi
Publication year - 2020
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.2019.0928
Subject(s) - converters , network topology , inductor , topology (electrical circuits) , mode (computer interface) , buck converter , voltage , computer science , electronic engineering , electrical engineering , control theory (sociology) , engineering , operating system , control (management) , artificial intelligence
This work targets reducing the mode transition time drastically, for two of the bidirectional DC–DC converters (BDCs) employed in energy storage systems, simultaneously proposing a smooth start‐up process. Two different mode transition techniques are introduced for topology A (proposed) and topology B, respectively, whose transition times are much smaller than the existing transition techniques. Topologies A and B are capable of performing all basic converter operations, i.e. buck, boost, inverting buck–boost and non‐inverting buck–boost in bidirectional mode, which allows the operating voltage ranges of both V 1 and V 2 to be increased perceivably. Both topologies are compared based on mode transition methodology, stress on the converter switches, inductor size and rating. A start‐up technique is also advocated for both topologies so that the start‐up response could be smooth. Two 400 W BDCs are designed with voltage levels of 60 and 120 V and experimentally verified for efficient start‐up, mode transition and steady‐state operations. Both mode‐transition techniques proposed here, take 2 μs for the current reversal on the battery side from +5 to −5 A.