Development and Evaluation of an Isolated Resonant Converter for Auxiliary Power Supply in DC Traction

V. V. S. K. Bhajana, P. Drabek


This paper presents the implementation and evaluation of an isolated resonant converter and also compares the efficiencies of hard and soft switching isolated converter topologies using high-frequency transformer for auxiliary power supplies in DC traction. The half-bridge DC-DC converter with resonant network has been tested under zero voltage switching (ZVS), zero current switching (ZCS) operations, and also dead time variation of the power switches improving the overall system efficiency. This paper provides guidelines for a cost effective DC-DC converter design based on discrete 1200V/40A IGBTs driven with high switching frequency. That would allow optimization of passive elements by reducing their mass making the converter suitable for traction application. Simulations and test results of an experimental setup with output power up to 3kW are presented. The overall system efficiency of the ZVS and ZCS operations of half-bridge LLC DC-DC converter were compared with a classic hard switching topology.


ZVS; ZCS; half bridge resonant converter; LLC; DC-DC; auxiliary power supply

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O. Kokkinaki, A. Klini, M. Polychronaki, N. Mavrikakis, K. Siderakis, E. Koudoumas, D. Pylarinos, E. Thalassinakis, C. Kalpouzos, D. Anglos, “Remote LIBS for assessing the condition of field-aged composite HV outdoor insulators”, 10th International Conference on Instrumental Methods of Analysis, Heraklion, Greece, September 17-21, 2017

X. Li, “A LLC type dual bridge resonant converter: Analysis, design, simulation and experimental results”, IEEE Transactions on Power Electronics, Vol. 29, No. 8, pp. 4313–4321, 2014

W. Chen, Z. Lu, “Investigation on topology for type-4 LLC resonant DC-DC converter”, 39th Annual IEEE Power Electronics Specialist Conference, Rhodes, Greece, pp. 1421–1425, June 15-19, 2008

H. Kato, H. Matsuo, T. Ito, S. Kawazu, D. Kawahara, S. Motomura, R. Hamaguchie, “Comparative analysis of full bridge and half bridge current resonant converter”, IEEE 33rd International Telecommunications Energy Conference, Amsterdam, Netherlands, October 9-13, 2011

Y. S. Dow, H. I. Son, H. D. Lee, “A study on half bridge LLC converter for battery charger on board”, 8th International Conference on Power Electronics and ECCE Asia, Jeju, Korea, May 30-June 3, 2011

B. Yong, F. C. Lee, A. J. Zhang, G. Huang, “LLC resonant converter for front end dc-dc conversion”, APEC. Seventeenth Annual IEEE Applied Power Electronics Conference and Exposition, Dallas, USA, March 10-14, 2002

P. Spanik, P. Drgona, M. Frivaldsky, A. Prikopova, “Design and Application of Full Digital Control System for LLC Multiresonant Converter”, Elektronikair Elektrotechnika (Electronics and Electrical Engineering), Vol. 106, No. 10, pp. 75-78, 2010

J. B. Lee, J. K. Kim, J. I. Baek, J. H. Kim, G. W. Moon, “Resonant Capacitor On/Off Control of Half-Bridge LLC Converter for High-Efficiency Server Power Supply”, IEEE Transactions on Industrial Electronics, Vol. 63, No. 9, pp. 5410-5415, 2016

V. V. S. K. Bhajana, P. Drabek, M. Jara, “Performance Evaluation of LLC Resonant Full Bridge DC-DC converter for auxiliary systems in traction”, Revue Roumaine des Sciences Techniques - Serie Electrotechnique et Energetique, Vol. 60, No. 1, pp. 79-88, 2015

J. I. Z. Chen, “A High Efficiency Full-bridge Converter”, Journal of Electrical Systems, Vol. 8, No. 4,pp. 442-458, 2012

J. W. Kim, J. K. Han, J. S. Lai, “APWM adapted half-bridge LLC converter with voltage doubler rectifier for improving light load efficiency”, Electronics Letters, Vol. 53, No. 5, pp. 339-341, 2017

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