A High efficiency isolated on-board EV battery charger using LLC resonant converter


In this study, high efficiency design of an on-board Electrical Vehicle (EV) battery charger is presented. The presented charger has two stages where the first stage is conventional front-end boost converter and the second stage is LLC resonant converter. The basic principles of both stage are discussed and the detailed design procedures are presented in terms of wide range output voltage regulation, wide range load condition, high efficiency and high power density. The presented design approach is tested with a prototype implemented with 2.5 kW output power at 250 V-450 V output voltage range. The peak efficiency of system is obtained as 95.53% at full load condition.

Author Biography

Sevilay Cetin, Technology Faculty, Pamukkale University, Denizli, 20125, Turkey.

Sevilay Cetin was born in Denizli, Turkey. She received the B.S. and M.S. degrees in Electrical-Electronics Engineering from Pamukkale University, Denizli, in 2001 and 2005, respectively, and the Ph.D. degree in Electrical Engineering from Yildiz Technical University, Istanbul, Turkey, in 2011. She was a Postdoctoral Research Associate at the New York State Center for Future Energy Systems, Rensselaer Polytechnic Institute, Troy, NY, USA, from 2013 to 2014. She was an Assistant Professor with the Technology Faculty at Pamukkale University, from 2012 to 2018, where she is currently an Associate Professor. Her main research interests include dc–dc/ac–dc converter topologies, softswitching techniques, high efficiency, and high power density energy conversion in various industrial areas.

Electrical Engineering