Design and Implementation of Full Bridge Bidirectional Isolated DC-DC Converter for High Power Applications 1 Tahsin Koroglu, Student Member, IEEE, 2 M. Mustafa Savrun, Student Member, IEEE, 3 Adnan Tan, Student Member, IEEE, 4 Mehmet Ugras Cuma, 5 Kamil Ça÷atay Bayindir, 6 Mehmet Tumay 1,2,3,4,6 CUKUROVA UNIVERSITY Electrical and Electronics Engineering Dept. Adana, Turkey Tel.: +90 / (322) – 338 60 84 Fax: +90 / (322) – 338 69 45 E-Mail: 1 tkoroglu@cu.edu.tr, 2 msavrun@cu.edu.tr, 3 atan@cu.edu.tr, 4 mcuma@cu.edu.tr, 6 mtumay@cu.edu.tr 5 YILDIRIM BEYAZIT UNIVERSITY Energy Systems Engineering Dept. Ankara, Turkey Tel.: +90 / (312) – 324 15 55 Fax: +90 / (312) – 324 15 05 E-Mail: 5 kcbayindir@ybu.edu.tr Acknowledgements The authors would like to acknowledge The Scientific and Technological Research Council of Turkey (TÜBøTAK - Project Number: 112R028) for their full financial support. Keywords «Power semiconductor device», «Power quality», «High frequency power converter», «Voltage Source Inverters (VSI)» Abstract This paper proposes the design and implementation of a high power full bridge bidirectional isolated DC-DC converter (BIDC) which comprises of two symmetrical voltage source converters and a high frequency transformer. In the proposed BIDC, a well-known PI controller based single phase-shift (SPS) modulation technique is used in order to achieve high power transfer. Besides, different phase shift methods such as extended phase-shift (EPS) and double phase-shift (DPS) are compared with SPS. Both simulation and experimental results are caried out to verify PI controller based simple phase-shift controlled BIDC prototype that is designed for 300-V 2.4-kW and operating at 20 kHz. Introduction Bidirectional isolated DC-DC converters (BIDC) have recently received a lot of attention due to the increasing need for systems with the capability of bidirectional energy transfer between two DC buses. Apart from traditional application in dc motor drives, new applications of BIDC include energy storage in renewable energy systems, fuel cell energy systems, custom power devices, hybrid electric vehicles (HEV) and uninterruptible power supplies (UPS) [1]. A main motivation is to replace line-frequency transformers with high-frequency transformers, in which galvanic isolation is indispensable between the two sets of dc terminals [2]. Various BIDC topologies have been proposed except from full bridge as reviewed in [3] such as dual flyback [4, 5], dual-Cuk [6] Zeta Sepic [7], forward-flyback [8], dual push-pull [9], push-pull-forward [10], push-pull-flyback [11] and dual half bridge [12].