Non‐isolated bidirectional DC–DC converters with multi‐converter functionality employing novel start‐up and mode transition techniques. Issue 14 (1st November 2020)

• Record Type: Journal Article
• Authors: Sharma, Ambuj; Nag, Soumya Shubhra; Bhuvaneswari, Gurumoorthy; Veerachary, Mummadi
• Is Part Of: IET power electronics. Volume 13:Issue 14(2020)
• Page Start: 3110
• Page End: 3118
• Publication Date: 2020-11-01
• Subjects: DC‐DC power convertors -- energy storage -- power inductors; bidirectional DC–DC converters -- multiconverter functionality -- smooth start‐up process -- mode transition methodology -- mode transition techniques -- energy storage system -- voltage 120.0 V -- voltage 60.0 V -- time 2.0 mus -- steady‐state operation -- inductor size -- converter switch; Power electronics -- Periodicals; 621.31705
• DOI: 10.1049/iet-pel.2019.0928
• Languages: English
• ISSNs: 1755-4535

Abstract

Abstract : 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.