Closed-form solution for efficient ZVS modulation of DAB converters

J. Everts

Research output: Contribution to journalArticleAcademicpeer-review

43 Citations (Scopus)
8 Downloads (Pure)

Abstract

A directly employable closed-form analytical solution for the calculation of an efficient, full-operating-range zero voltage switching (ZVS) modulation scheme for bidirectional dual active bridge (DAB) dc–dc converters is presented. Contrary to the analytical ZVS modulation schemes previously proposed in literature, the amount of charge that is required to charge the nonlinear parasitic output capacitances of the switches during commutation is incorporated, ensuring complete commutation of the bridge legs and ZVS of the switching devices. Besides quasilossless ZVS, the resulting modulation scheme leads to nearminimum high-frequency circulating currents and thus minimum conduction losses under the condition of ZVS and for given values of the inductances and transformer turns ratio. Although modifiable for other implementations, the method is demonstrated for a full-bridge full-bridge DAB as core part of a single-phase, singlestage, bidirectional, isolated AC–DC converter. The resulting modulation scheme is compared with a ZVS modulation scheme calculated using a previously published numerical approach, proving its effectiveness. Experimental results obtained from a state-of-the-art, 3:7 kW converter prototype which interfaces a 400 V battery with the 230 V, 50 Hz utility grid are given to validate the theoretical analysis and practical feasibility of the proposed strategy.
Original languageEnglish
Article number7762886
Pages (from-to) 7561-7576
Number of pages16
JournalIEEE Transactions on Power Electronics
Volume32
Issue number10
Early online date1 Dec 2016
DOIs
Publication statusPublished - Oct 2017

Keywords

  • AC-DC power conversion
  • DC-DC power conversion
  • battery chargers
  • circuit analysis
  • dual active bridge (DAB)
  • optimal modulation
  • zero voltage switching (ZVS)

Fingerprint Dive into the research topics of 'Closed-form solution for efficient ZVS modulation of DAB converters'. Together they form a unique fingerprint.

Cite this