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Browse Journals & Magazines > Industrial Electronics, IEEE ...> Volume:58 Issue:7 Help

An Isolated DC/DC Converter Using High-Frequency Unregulated LLC Resonant Converter for Fuel Cell Applications

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3 Author(s)
Jun-Young Lee ; Dept. of Electron. Eng., Myongji Univ., Yongin, South Korea ; Yu-Seok Jeong ; Byung-Moon Han

This paper suggests an isolated dc/dc converter using an unregulated LLC converter for fuel cell applications. The LLC converter operates as an isolated voltage amplifier with a constant voltage gain, and a nonisolated converter installed in the input stage regulates the output voltage under a wide variation of fuel cell stack voltage. By separating the functions, the unregulated LLC converter can be operated at an optimal switching condition, and the high-frequency operation of 300 kHz can be accomplished without introducing an excessive switching loss. The prototype converter with a 1-kW design (Vin = 24 ~ 48 V/Vo = 400 V) shows an efficiency of above 90.2% under a 24-V input and full load conditions.

Published in:
Industrial Electronics, IEEE Transactions on  (Volume:58 ,  Issue: 7 )

Date of Publication: July 2011

Page(s):
2926 - 2934
ISSN :
0278-0046
INSPEC Accession Number:
12049301
Digital Object Identifier :
10.1109/TIE.2010.2076311
Product Type:
Journals & Magazines
Date of Publication :
13 September 2010
Date of Current Version :
13 June 2011
Issue Date :
July 2011
Sponsored by :
IEEE Industrial Electronics Society

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