High-efficiency isolated boost DC–DC converter for high-power low-voltage fuel-cell applications / Nymand, Morten in IEEE transactions on industrial electronics, Vol. 57 N° 2 (Fevrier 2010)  

Public ISBD [article]  inIEEE transactions on industrial electronics > Vol. 57 N° 2 (Fevrier 2010) . - pp. 505 - 514 Titre : High-efficiency isolated boost DC–DC converter for high-power low-voltage fuel-cell applications Type de document : texte imprimé Auteurs : Nymand, Morten, Auteur ; Andersen, Michael A. E., Auteur Article en page(s) : pp. 505 - 514 Note générale : Génie électrique Langues : Anglais (eng) Mots-clés : DC-DC converter Fuel-cell system High efficiency Switched-mode power supply Transformer Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : 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%. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5332306 [article] High-efficiency isolated boost DC–DC converter for high-power low-voltage fuel-cell applications [texte imprimé] / Nymand, Morten, Auteur ; Andersen, Michael A. E., Auteur . - pp. 505 - 514. Génie électrique Langues : Anglais (eng) in IEEE transactions on industrial electronics > Vol. 57 N° 2 (Fevrier 2010) . - pp. 505 - 514 Mots-clés : DC-DC converter Fuel-cell system High efficiency Switched-mode power supply Transformer Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : 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%. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5332306

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