Design of Optimal Resonant Frequency for Series-Loaded Resonant DC-DC Converter in EVs On-Board Battery Charger Application

전기자동차 탑재형 충전기용 부하직렬공진형 컨버터의 최적 공진주파수 설계

  • Oh, Chang-Yeol (School of Information and Communication Engineering, Sungkyunkwan University) ;
  • Kim, Jong-Soo (Power Center, Material & Device Research Center, Samsung Advanced Institute of Technology) ;
  • Lee, Byoung-Kuk (School of Information and Communication Engineering, Sungkyunkwan University)
  • Received : 2011.09.09
  • Accepted : 2011.12.13
  • Published : 2012.02.20


This paper describes the process of optimal resonant frequency design with full-bridge series-loaded resonant dc-dc converter in a high efficiency 3.3 kW on-board battery charger application for Electric Vehicles and Plug-in Hybrid Electric Vehicles. The optimal range of resonant frequency and switching frequency used for ZVS are determined by considering trade-off between loss of switching devices and resonant network with size of passive/magnetic devices. In addition, it is defined charging region of battery, the load of on-board charger, as the area of load by deliberating the characteristic of resonant. It is verified the designed frequency band by reflecting the defined area on resonant frequency.


Supported by : 한국에너지기술평가원 (KETEP)


  1. M. M. Morcos, C. R. Mersman, G. G. Sugavanam, and N. G. Dillman, "Battery chargers for electric vehicles", IEEE Power engineering Review, pp. 8-11, 2000, November.
  2. Y. C. Chiang, Y. L. Ke, H. S. Chuang, and H. K. Chen, "Implementation and analysis of an improved series-loaded resonant dc-dc converter operating above resonance for battery chargers", IEEE Industrial and Commercial Power Systems Technical Conference (ICPS) 2008, pp. 1-8, 2008, May.
  3. 김종수, "전기자동차용 탑재형 충전기의 공진 Network 최적 설계에 관한 연구", 성균관대학교 대학원 박사논문, 2011
  4. M. P. Robinson and J. Clegg, "Improved determination of Q-factor and resonant frequency by a quadratic curve fitting method", IEEE Transaction on Electromagnetic Compatibility, Vol. 47, No. 2, pp. 399-402, 2005, May.
  5. K. J. Coakley, J. D. Splett, M. D. Janezic and R. F. Kaiser, "Estimation of Q-factors and resonant frequencies", IEEE Trans. Microw. Theory Tech., Vol. 51, No. 3, pp. 862-868, 2003, Mar.
  6. S. Santoso and A. Maitra, "Empirical estimation of system parallel resonant frequencies using capacitor switching transient data", IEEE Trans. Power Del., Vol. 20, No. 2, pt. 1, pp. 1151-1156, 2005, Apr.
  7. N. Mohan, T. M. Undeland, W. P. Rbbins, "Power electronoics - converter, application and design," 3rd ed., John Wiley & Sons, Inc., 2003.
  8. R. L. Steigerwald, "A comparison of half-bridge resonant converer topologies", IEEE Trans. Power. Electron., Vol. 3, No. 2, pp. 174-182, 1988, April.
  9. J. J. Chen, F. C. Yang, C. C. Lai, Y. S. Hwang, and R. G. Lee, "A high efficiency multimode Li-Ion battery charger with variable current source and controlling previous-stage supply voltage", IEEE Trans. Ind. Electron., Vol. 56, No. 7, pp. 2469-2478, 2009, July.
  10. C. W. T. McLyman, "Transformer and inductor design handbook", 3rd Ed, Marcel Dekker Inc. New york, 2008.
  11. WIMA Corporation [Online],
  12. TDK Corporation [Online], "Ferrite for switching power supplies", Feb. 2010,

Cited by

  1. A Study on the Optimal Design of 5 kW Plasma Discharger vol.21, pp.2, 2016,
  2. Development of the Anti-Start Air Conditioner Compressor Resonant DC/DC Converter for Commercial Vehicle vol.19, pp.6, 2014,
  3. Development of Battery Charger for Electric Vehicle using the LLC Resonant Converter vol.18, pp.5, 2013,
  4. Variable Output and Parallel Operation Control of EV Charger vol.18, pp.2, 2013,
  5. A Study on Reactor Capacitance Estimation Algorithm and 5kW Plasma Power Supply Design for Linear Output Control of Wide Range vol.21, pp.6, 2016,