Analysis and Control of an Input-Parallel Output-Series Connected Buck-Boost DC–DC Converter for Electric Vehicle Powertrains

Many electric vehicle (EV) powertrains use a boost-type dc–dc converter to step-up the battery voltage for optimization and improving vehicle performance. The converter allows variation of inverter dc-link voltage to further reduce losses. By focusing on boost operation only, previously proposed drivetrains have not fully utilized the benefits of variable dc-link. This article describes a new non-isolated bidirectional dc–dc converter capable of voltage step-down as well as high-gain voltage step-up operation. Such wide voltage range operation can lead to improved efficiency of EV drivetrains. The proposed converter comprises two non-inverting buck-boost modules, configured to operate in various optimized modes depending on the load requirement. Compared to existing bidirectional buck-boost converters, the proposed converter offers lower switch stress, reduced converter size, and better efficiency. The operation of the converter in different modes is described in detail, followed by small-signal modeling and an outline of the control scheme. Experimental results obtained in an all-SiC 5 kW prototype show stable operation while the converter emulates the behavior of the dc–dc stage in a variable dc-link EV powertrain under the ECE 15 drive cycle. The prototype demonstrated peak efficiencies of more than 98.5% and 98% for voltage step-up and step-down operations, respectively.

• Record URL:
  • http://dx.doi.org/10.1109/TTE.2022.3216610
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/23327782
• Supplemental Notes:
  • Copyright © 2023, IEEE.
• Authors:
  • Khan, Mohammad Saleh
  • 0000-0003-0567-6870
  • Nag, Soumya Shubhra
  • 0000-0003-1043-2934
  • Das, Anandarup
  • 0000-0001-5326-9570
  • Yoon, Changwoo
• Publication Date: 2023-6

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: pp 2015-2025
• Serial:
  • IEEE Transactions on Transportation Electrification
  • Volume: 9
  • Issue Number: 2
  • Publisher: Institute of Electrical and Electronics Engineers (IEEE)
  • ISSN: 2332-7782
  • Serial URL: http://ieeexplore.ieee.org/servlet/opac?punumber=6687316

Subject/Index Terms

• TRT Terms: Control system applications; Electric vehicles; Power converters; Power trains; Silicon carbide; Voltage
• Subject Areas: Energy; Highways; Materials; Vehicles and Equipment;

Filing Info

• Accession Number: 01922349
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 24 2024 9:26AM