A step-up bidirectional series resonant DC/DC converter using a continuous current mode

Federico Martin Ibanez, Jose Martin Echeverria, Javier Vadillo, Luis Fontan

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)


This paper presents the analysis and design of a novel technique that allows the conventional series resonant dc/dc converter (SRC) to work as a step-up and step-down converter. This is useful in bidirectional dc/dc converters where one port is attached to a fixed voltage dc line, e.g., a 360-V dc line, and the other port is attached to an energy storage device such as a bank of supercapacitors or batteries. Every converter that works in this scenario requires step-up and step-down modes to transfer energy from one port to the other. The paper presents the SRC as an alternative to the well-known dual active bridge (DAB). The dc analysis is detailed to demonstrate the step-up capability. In addition, the ac analysis is presented. Experimental results from a 6-kW prototype validate the theoretical analysis. The results indicate that this technique achieves better efficiency compared to the phase-shift DAB in a wide power range, from heavy to light loads. The main reason for this is that the converter works with smaller currents than the DAB at light loads.

Original languageEnglish
Article number6799996
Pages (from-to)1393-1402
Number of pages10
JournalIEEE Transactions on Power Electronics
Issue number3
Publication statusPublished - Mar 2015
Externally publishedYes


  • DC/DC converter
  • resonant converter
  • supercapacitor (SC)


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