Non-inverting and Non-isolated Magnetically Coupled Buck-Boost Bidirectional DC-DC Converter Articles uri icon

publication date

  • April 2020

start page

  • 11942

end page

  • 11954

issue

  • 11

volume

  • 35

International Standard Serial Number (ISSN)

  • 0885-8993

Electronic International Standard Serial Number (EISSN)

  • 1941-0107

abstract

  • A new non-isolated dc&-dc converter with noninverting output and buck&-boost operation, named magnetically coupled buck&-boost bidirectional (MCB3) converter, is presented in this article. The MCB3 passive components arrangement connects the input and output ports getting an equivalent behavior to that of the dual active bridge (DAB) converter, but in a non-isolated topology. This equivalency allows applying Triple Phase Shift (TPS)modulation to MCB3. TPS is known to minimize conduction lossesand to achieve soft switching at any load in the DAB converter.Throughout the article, the features of the DAB converter are usedas a reference to show the main features of the proposed converter.Moreover, other modulation strategies based on TPS modulationare used in MCB3 to operate within the minimum losses path.The multiple operation modes found on the MCB3 under TPSmodulation are identified, classified, and used to find the operatingpoints that minimize the switching and conduction losses over thepower range. The analysis is shown for the boost mode that isthe worst case design. MCB3 and DAB topologies are designedand simulated for the same specification to validate the theoreticalstudy. Finally, experimental measurements on 460-W prototypesfor both topologies corroborate the equivalent operation and themain features of the MCB3

keywords

  • bridge circuits; inductors; switches; topology; phase modulation; mosfet