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Electrical, Control and Communication Engineering

The Journal of Riga Technical University

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Loss Reduction Method for the Isolated qZS-based DC/DC Converter

Janis Zakis / Ivars Rankis / Liisa Liivik
Published Online: 2013-12-31 | DOI: https://doi.org/10.2478/ecce-2013-0016


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.

Keywords : DC-DC power converters; resonant inverters; zero current switching; zero voltage switching

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About the article

Janis Zakis

Janis Zakis (M’10) received B.Sc., M.Sc. and Dr.Sc.ing. in electrical engineering from Riga Technical University, Riga, Latvia, in 2002, 2004 and 2008, respectively. He is presently a Senior Researcher in the Institute of Industrial Electronics and Electrical Engineering, Riga Technical University. He has over 20 publications and is the holder of one Utility Model in power converter design. His research interests include flexible ac transmission systems (FACTS), simulation of power systems, switching mode power converters, applied design of power converters and energy storage systems. Riga Technical University, Institute of Industrial Electronics and Electrical Engineering. Address: Kronvalda 1, LV1048, Riga, Latvia; janis.zakis@ieee.org

Ivars Rankis

Ivars Rankis, professor, Hab.Dr.sc.eng. He graduated from Riga Polytechnical Institute in 1960 as engineer-electromechanic. Defended his first degree of Dr.sc. (candidate of technical sciences) in 1970. Defended his second degree Hab.Dr.sc.eng. in 1992 at Riga Technical University. From 1958-1966 he worked as engineer at Riga Electrical Machine Building Company. From 1966 he started studies as doctoral student, and from 1970 – as teacher of different subjects of electrical engineering at Riga Technical University. Research interests are connected with power electronics and industrial automation. Presently he is professor at the Department of Industrial Electronics and Electrical Technologies of Riga Technical University. Riga Technical University, Institute of Industrial Electronics and Electrical Engineering. Address: Kronvalda 1, LV1048, Riga, Latvia; phone +37167089917, rankis@eef.rtu.lv

Liisa Liivik

Liisa Liivik, received Dipl.-Eng, M.Sc. in Electrical Engineering from the Department of Electrical Drives and Power Electronics, Tallinn University of Technology, Tallinn, Estonia, in 1998 and 2000, respectively. She is currently working toward the Ph.D. degree at the Department of Electrical Engineering. From 2002 to 2007, she was a lecturer in the Department of Electrical Drives and Power Electronics, Tallinn University of Technology. Her teaching areas included basics of measurement engineering and numerical calculations in electrotechnics. Her fields of interest are: research, design and simulation of switch mode converters for distributed power generation systems. She received an award (2nd place) for her master thesis "Numerical Calculations of Electrotechnics" from Estonian Academy of Sciences and is author or co-author of more than 10 scientific papers and 1 book. Tallinn University of Technology, Department of Electrical Engineering. Address: Ehitajate tee 5, 19086 Tallinn, Estonia; liisa.liivik.ee@ieee.org

Published Online: 2013-12-31

Published in Print: 2013-12-01

Citation Information: Electrical, Control and Communication Engineering, Volume 4, Issue 1, Pages 13–18, ISSN (Online) 2255-9159, ISSN (Print) 2255-9140, DOI: https://doi.org/10.2478/ecce-2013-0016.

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