Published December 12, 2020 | Version v1
Journal article Restricted

Bidirectional Isolated Current-Source DAB Converter With Extended ZVS/ZCS Range and Reduced Energy Circulation for Storage Applications

Authors/Creators

  • 1. Tallinn University of Technology
  • 2. University of California, Santa Cruz

Description

This article proposes a bidirectional isolated dc-dc converter topology with the current-source and voltage-source terminals. Two bidirectional switches in the current-source bridge side and a novel modulation algorithm allow soft switching of all semiconductors under wide load conditions with a relatively low energy circulation and without any dedicated snubbers or clamp circuits. Zero-voltage switching of high-voltage switches can be achieved even at no-load conditions, which allows application of external snubber capacitors to reduce turn-off losses. Voltage regulation is provided using relatively simple phase-shift modulation. Design constraints of the converter are evaluated and analyzed for both energy transfer directions. The steady-state operation is presented and verified experimentally with a 500-W prototype. The efficiency of the power stage reached 96.7% and 97.2% at the maximum power in the boost and buck modes, respectively. The converter can be used in renewable, supercapacitor, battery, and dc microgrid applications.

Notes

This work was supported in part by the Estonian Centre of Excellence in Zero Energy and Resource Efficient Smart Buildings and Districts under Grant 2014-2020.4.01.15-0016 funded by the European Regional Development Fund and in part by the European Economic Area (EEA) Financial Mechanism 2014–2021 under Grant EMP474.

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