A New Very-High-Efficiency R4 Converter for High-Power Fuel Cell Applications

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Abstract

A new very high efficiency 10 kW isolated R4 boost converter for low-voltage high-power fuel cell applications is presented. Using a new concept for partially paralleling of isolated boost converters, only the critical high ac-current parts are paralleled. Four 2.5 kW power stages, consisting of fullbridge switching stages and power transformers, operate in parallel on primary side and in series on secondary side. Current sharing is guaranteed by series connection of transformer secondary windings and three small cascaded current balancing transformers on primary side. The detailed design of a 10 kW prototype converter is presented. Input voltage range is 30-60 V and output voltage is 800 V. Test results, including voltage- and current waveforms and efficiency measurements, are presented. A record high converter efficiency of 98.2 % is achieved. The proposed R4 boost converter thus constitutes a low cost solution to achieve very high conversion efficiency in high input current applications.
Original languageEnglish
Title of host publicationThe Eigth International Conference on Power Electronics and Drive Systems
Place of PublicationTaiwan
Publication date2009
Pages601
Publication statusPublished - 2009
Event8th International Conference on Power Electronics and Drive Systems - Taipei, Taiwan, Province of China
Duration: 2 Nov 20095 Nov 2009
Conference number: 8
http://www.peds09.ntust.edu.tw/

Conference

Conference8th International Conference on Power Electronics and Drive Systems
Number8
CountryTaiwan, Province of China
CityTaipei
Period02/11/200905/11/2009
Internet address

Keywords

  • switched mode power supply
  • pulse width modulation
  • Current transformers
  • power electronics
  • fuel cell power system

Cite this

Nymand, M., & Andersen, M. A. E. (2009). A New Very-High-Efficiency R4 Converter for High-Power Fuel Cell Applications. In The Eigth International Conference on Power Electronics and Drive Systems (pp. 601).