A Comparison of Half Bridge & Full Bridge Isolated DC-DC Converters for Electrolysis Application
R. Samuel Rajesh Babu1, Joseph Henry2

1R. Samuel Babu, Research Scholar, EEE Department, Sathyabama University, Chennai, India.
2Dr. Joseph Herny, EEE Department, Vel Tech University, Chennai, India.
Manuscript received on August 13, 2011. | Revised Manuscript received on August 19, 2011. | Manuscript published on September 05, 2011. | PP: 37-42 | Volume-1 Issue-4, September 2011. | Retrieval Number: D079071411/2011©BEIESP
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© The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: This paper presents a comparison of half bridge and full bridge isolated, soft-switched, DC-DC converters for Electrolysis application. An electrolyser is a part of renewable energy system which generates hydrogen from water electrolysis that used in fuel cells. A DC-DC converter is required to couple electrolyser to system DC bus. The proposed DC-DC converter is realized in both full-bridge and half-bridge topology in order to achieve zero voltage switching for the power switches and to regulate the output voltage. Switching losses are reduced by zero voltage switching. Switching stresses are reduced by using resonant inductor and capacitor. The proposed DC-DC converter has advantages like high power density, low EMI, reduced switching stresses, high circuit efficiency and stable output voltage. The MATLAB simulation results show that the output of converter is free from the ripples and regulated output voltage and this type of converter can be used for electrolyser application . Experimental results are obtained from a MOSFET based DC-DC Converter with LC filter. The simulation results are verified with the experimental results.
Keywords: DC-DC converter, electrolyser, renewable energy sources, resonant converter, TDR.