High-Efficiency Isolated Boost DCDC Converter for High-Power Low-Voltage Fuel-Cell Applications

Morten Nymand, Michael A. E. Andersen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A new design approach achieving very high conversion efficiency in low-voltage high-power isolated boost dc-dc converters is presented. The transformer eddy-current and proximity effects are analyzed, demonstrating that an extensive interleaving of primary and secondary windings is needed to avoid high winding losses. The analysis of transformer leakage inductance reveals that extremely low leakage inductance can be achieved, allowing stored energy to be dissipated. Power MOSFETs fully rated for repetitive avalanches allow primary-side voltage clamp circuits to be eliminated. The oversizing of the primary-switch voltage rating can thus be avoided, significantly reducing switch-conduction losses. Finally, silicon carbide rectifying diodes allow fast diode turn-off, further reducing losses. Detailed test results from a 1.5-kW full-bridge boost dc-dc converter verify the theoretical analysis and demonstrate very high conversion efficiency. The efficiency at minimum input voltage and maximum power is 96.8%. The maximum efficiency of the proposed converter is 98%.
Original languageEnglish
JournalI E E E Transactions on Industrial Electronics
Volume57
Issue number2
Pages (from-to)505-514
ISSN0278-0046
DOIs
Publication statusPublished - 2010

Keywords

  • switched-mode power supply
  • DC-DC converter
  • high efficiency
  • transformer
  • fuel-cell system

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