Soft-Switching Techniques for Efficiency Gains in Full-Bridge Fuel Cell Power Conversion
作者： Martin Ordonez , John E. Quaicoe
DOI: 10.1109/TPEL.2010.2059712
关键词: Electronic engineering 、 MOSFET 、 Transformer 、 Engineering 、 Ringing 、 Diode 、 Low voltage 、 Energy conversion efficiency 、 Inductor 、 Thermal conduction
摘要: This paper presents a set of novel soft-switching techniques to increase the power conversion efficiency in fuel cell (FC) systems using full-bridge topology. For this purpose, special right-aligned modulation sequence is developed minimize conduction losses while maintaining characteristics MOSFETs. Traditional auxiliary elements primary, such as series inductors that are impractical for realizing due extreme input current, avoided and reflected output rectifier circulating current generate soft transitions diodes. As result, proposed combined successfully reduce losses, reverse-recovery rectifiers, transformer ringing, ensure low stress all switches. The high maintained entire range loading conditions (0%-100%) taking into consideration remarkable challenges associated with FC conversion: voltage poor regulation, wide conditions. A detailed analysis gains presented phase-shift zero-voltage switching topology employed reference highlight mechanisms performance enhancement advantages use modulation. Experimental results 1-kW converter validate gains, illustrate benefits modulation, demonstrate transitions.
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