Modulation scheme for the bidirectional operation of the Phase Shift Full Bridge Power Converter
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Show full item recordEditorial
IEEE
Date
2020-02Referencia bibliográfica
Published version: https://doi.org/10.1109/TPEL.2019.2923804
Abstract
This paper proposes a novel modulation technique for the bidirectional operation of the Phase Shift Full
Bridge (PSFB) DC/DC power converter. The forward or buck operation of this topology is well known and widely used in
medium to high power DC to DC converter applications. In contrast, backward or boost operation is less typical since it
exhibits large drain voltage overshoot in devices located at the secondary or current-fed side; a known problem in isolated
boost converters. For that reason other topologies of symmetric configuration are preferred in bidirectional applications,
like CLLC resonant converter or Dual Active Bridge (DAB). In this work, we propose a modulation technique
overcoming the drain voltage overshoot of the isolated boost converter at the secondary or current-fed side, without
additional components other than the ones in a standard PSFB and still achieving full or nearly full ZVS in the primary
or voltage-fed side along all the load range of the converter. The proposed modulation has been tested in a bidirectional
3.3 kW PSFB with 400 V input and 54.5 V output, achieving a 98 % of peak efficiency in buck mode and 97.5 % in boost
mode operation. This demonstrates that the PSFB converter may become a relatively simple and efficient topology for
bidirectional DC to DC converter applications.