This paper presents an isolated quasi-Z-source inverter-based (qZSI) resonant DC/DC converter. The explanation of selection of the proposed topology is justified. Both the normal and the boost modes are discussed. Theoretical operation waveforms as well as basic expressions for the calculation of currents and voltages are proposed. A 1500 W laboratory prototype was built and experimentally verified at two operation points: that of light-load (300 W) and full-load (1500 W). All the experiments were also carried with resonant circuit and without it. The experimental results as well as performance of proposed qZSI based resonant DC/DC converter laboratory setup are presented and analyzed. Experimental and calculated characteristics showing the dependence of the load voltage and supply current on the load resistance in both modes were presented. The dynamic losses in the transistors were evaluated for the cases with the resonant circuit and without it. The main conclusions based on this study are summarized and the future tasks for development of proposed converter were defined.
 Yuan Li; Anderson, J.; Peng, F.Z.; Dichen Liu, "Quasi-Z-Source Inverter for Photovoltaic Power Generation Systems", Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition APEC 2009, pp. 918-924, 15-19 Feb. 2009.
 Vinnikov, D.; Roasto, I.; Zakis, J.; Strzelecki, R.: New Step-Up DC/DC Converter for Fuel Cell Powered Distributed Generation Systems: Some Design Guidelines", in journal “Electrical Review” ISSN 0033-2097, Vol. 86., Nr 8., 2010, pp. 245-252.
 Zakis, J.; Vinnikov, D.; Roasto, I., "Soft-switching capability analysis of a qZSI-based DC/DC converter," Electronics Conference (BEC), 12th Biennial Baltic, pp.301-304, 4-6 Oct. 2010.
 Fang Zheng Peng, "Z-source inverter", IEEE Transactions on Industry Applications, vol.39, no.2, pp. 504-510, Mar/Apr 2003.
 J. Zakis and D. Vinnikov, “Implementation Possibilities of SMD Capacitors for High Power Applications,” Electrical, Control and Communication Engineering, vol. 1, no. 1, pp. 18-23, Jan. 2012., ISSN 22559140.
 C. Roncero-Clemente, E. Romero-Cadaval, O. Husev, D. Vinnikov, and S. Stepenko, “Simulation of Grid Connected Three-Level Neutral-Point- Clamped qZS Inverter using PSCAD,” Electrical, Control and Communication Engineering, vol. 2, no. 1, pp. 14-19, Jan. 2013, ISSN 2255-9140.
 Steigerwald, R.L., "Power electronic converter technology," Proceedings of the IEEE , vol.89, no.6, pp.890,897, Jun 2001.
 Steigerwald, R.L.; De Doncker, R.W.; Kheraluwala, M.H., "A comparison of high-power DC-DC soft-switched converter topologies," IEEE Transactions on Industry Applications, vol.32, no.5, pp.1139,1145, September/October 1996.
 Steigerwald, R.L., "A comparison of half-bridge resonant converter topologies," Power Electronics, IEEE Transactions on, vol.3, no.2, pp.174,182, April 1988.
 Bhat, A. K S, "Analysis and design of LCL-type series resonant converter," IEEE Transactions on Industrial Electronics, vol.41, no.1, pp.118-124, February 1994.
 Badstuebner, U.; Biela, J.; Kolar, J.W., "Power density and efficiency optimization of resonant and phase-shift telecom DC-DC converters," Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition. APEC 2008. pp. 311-317, 24-28 February 2008.
 Severns, Rudolf P., "Topologies for three-element resonant converters," IEEE Transactions on Power Electronics, vol.7, no.1, pp.89-98, January 1992.
 Yang, B.; Lee, F.C.; Zhang, A.J.; Guisong Huang, "LLC resonant converter for front end DC/DC conversion," Seventeenth Annual IEEE Applied Power Electronics Conference and Exposition. APEC 2002. vol.2, pp.1108-1112 vol.2, 2002.
 Yeh Ting; de Haan, S.; Ferreira, J.A., "A DC-DC Full-Bridge Hybrid Series Resonant Converter enabling constant switching frequency across wide load range," Power Electronics and Motion Control Conference (IPEMC), 2012 7th International , vol.2, pp.1143-1150, 2-5 June 2012
 Roasto, I.; Vinnikov, D.; Jalakas, T.; Zakis, J.; Ott, S.: Experimental study of shoot-through control methods for qZSI-based DC/DC converters, Proc. of SPEEDAM ’10 Symposium, 14-16 June 2010, pp. 29-34.
 Honnyong Cha; Peng, F.Z.; DongWook Yoo, "Z-source resonant DCDC converter for wide input voltage and load variation," 2010 International Power Electronics Conference (IPEC), pp.995-1000, June 21-24, 2010.
 Zakis, J.; Vinnikov, D.; Bisenieks, L. “Some Design Considerations for Coupled Inductors for Integrated Buck-Boost Converters”, III International Conference on Power Engineering, Energy and Electrical Drives POWERENG 2011, pp. 1-6, 2011.
 Chan, H.L.; Cheng, K.W.E.; Cheung, T.K.; Cheung, C.K., "Study on Magnetic Materials Used in Power Transformer and Inductor", 2nd International Conference on Power Electronics Systems and Applications ICPESA 2006, pp. 165-169, 12-14 Nov. 2006.