The aim of the research group is the development of power electronic converters, electrical drives, electro-heating and surface engineering equipment, and of control methods applied in these systems. Areas of expertise: -power electronics, resonant converters, induction heating; -magnetron sputtering; -electron beam welding; -vector control of the electrical drives; -system modeling and optimal control.
Dr. Kelemen András - Head of the research group Dr. Imecs Mária Dr. Dávid László Dr. György Katalin Dr. Kutasi Dénes-Nimród Dr. Fekete Albert-Zsombor Madarász Róbert-Rossi PhD, student Ferencz János PhD, student Zsigmond Andor MSc. student
„Development of a Special Pulsed Power Supply for the Plasma-Electrolytic Oxidation Process”, project leader Kelemen András, Contract nr. DE618/28.08.2017, Sapientia EMTE, Bay Zoltán Nonprofit Ltd., S.C. Tetronic srl.
1. Kelemen, A., Kutasi, D.-N., „Modeling and analysis of the induction-heating converters” in "Advances in Induction and Microwave Heating of Mineral and Organic Materials", 978-953-307-5 ", INTECH OPEN, Rijeka, Vienna, pp. 49-74, 2011. 2. Kelemen, A., Kutasi, D.-N., “Induction heating voltage inverter with hybrid LLC resonant load, the D-Q model”, Pollack Periodica, vol.2, No.1, 2007, pp. 27-37, Akadémiai Kiadó, Budapest. 3. Kelemen, A., Szekely, I., Mátyási, Sz., “Optimum gate-drive solutions for soft switching IGBT resonant voltage-source inverters”, Journal of Electrical Engineering (electronic), Vol. 6, No. 4, 2006, University "Politehnica" Timisoara, Romania, Faculty of Electrical Engineering, Politehnica Publishing House. 4. Kelemen, A., Kutasi, D.-N.: “Describing function analysis of a voltage-source induction-heating inverter with pulse amplitude modulation”, Acta Electrotehnica, Mediamira Science Publisher, vol.48, No.3, 2007, pp.223-229, Cluj Napoca. 5. Kutasi, N., Kelemen, A., Imecs, M., "Vector control of induction motor drives with predictive current controller", IEEE 6th International Conference on Computational Cybernetics 2008 ICCC2008, November 27-29, Stara Lesná, Slovakia.[CDROM], pp. 21-26, ISBN: 978-1-42442875-5, , Library of Congress: 2008907697, INSPEC Accession Number: 10428209. 6. Kutasi, D.-N., György, K., Kelemen, A., "Constant-frequency constrained optimal direct power control of voltage-source PWM rectifiers", Acta Electrotehnica, Mediamira Science Publisher, vol.51, No.2, 2010, pp.138-144. 7. Kelemen, A., Kutasi, D.-N. "Lyapunov-Based Frequency-Shift Power Control of Induction-Heating Converters with Hybrid Resonant Load", Acta Universitatis Sapientiae,Electrical and Mechanical Engineering, 1 (2009) 41-52. 8. Kelemen Andras, Kutasi N., Maria Imecs, I. I. Incze: “Constrained optimal direct power control of voltage-source PWM rectifiers”, in Proc. of the 14th IEEE International Conference on Intelligent Engineering Systems INES 2010, Las Palmas of Gran Canaria, May 5-7, 2010, CD-ROM, ISBN 978-1-4244-7651-0.A. 9. Kutasi, N., Kelemen, A., Mátyási, Sz., Imecs, M., “Hardware implementation of explicit predictive control of three-phase PWM rectifiers”, 11th International Carpathian Control Conference – ICCC 2010, Eger, Hungary, May 2010, ISBN 978-963-06-9289-2, pp. 133-136. 10. Kutasi, N., Kelemen, A., Imecs, M.: „Predictive control of voltage-fed induction heating inverters”, Analele Universităţii Craiova, Seria Inginerie Electrica, ISSN 1842-4805, Nr. 34, Vol. 2, 2010, pp. 83-88. 11. Imecs, M., „A survey of speed and flux control structures of squirrel-cage induction motor drives”, Acta Universitatis Sapientiae, Electrical and Mechanical Engineering, Scientific Journal of Sapientia University of Transilvania, Vol. 1, 2009, Scientia Publishing House, ISSN 2065-5616, pp. 5-28. 12. Imecs, M. „From space-phasors to the modern control theory of the AC motor drives”, Plenary Session, Proceedings of the 3nd International Conference in Recent Achievements in Mechatronics, Automation, Computer Science and Robotics MACRo 2011, Tg. Mures, Scientia Publishing House, Cluj-Napoca, 2011, ISBN 978-973-1970-54-7, pp. 1-22. 13. Kutasi, N., Kelemen, A., "Predictive control of the power electronic converters: a survey", Proc. 3rd Conference on Recent Achievements in Mechatronics, Automation, Computer Science and Robotics (MACRo2011), Sapientia University, Tîrgu Mureş, April 8-9, 2011, pp 213-224, ISBN 978-973-1970-54-7. 14. György, K., Kelemen, A., Papp, S., Jakab-Farkas, L., "Theoretical Study of the Gradient Method to Find the Optimal Control for the Reactive Sputtering Process", Acta Universitatis Sapientiae,Electrical and Mechanical Engineering, 3 (2011) 82-92, ISSN 2065-5916, (EBSCO). 15. Fekete, A.-Zs., Jakab-Farkas, L., Papp, S., Balogh, T.-Cs., “Dynamic pressure control in reactive sputtering process”, Acta Universitatis Sapientiae,Electrical and Mechanical Engineering, 4 (2012) 33-44. 16. György, K., Kelemen, A., Dávid, L., “Unscented Kalman filters and Particle Filter methods for nonlinear state estimation”, Proc. of the 7th International Conference Interdisciplinarity in Engineering, INTER-ENG 2013, 10-11 October 2013, Petru Maior University of Tîrgu Mures, Romania, Elsevier, Procedia Technology 12 ( 2014 ), Vol. 12, 2014, pp. 65–74, ISSN: 2212-0173. 17. Kelemen, A., Kutasi, N., György, K., “Parameter Estimation of Induction Heating Resonant Load Circuits”, Proc. of the 4-th International Conference on Recent Achievements in Mechatronics, Automation, Computer Science and Robotics, MACRo’2013, Sapientia University, Tg. Mures 2013, pp. 123-134, ISSN 2247 0948. 18. Kelemen, A., Kutasi, N., György, K., “Parameter Estimation of Induction Heating Resonant Load Circuits”, Proc. of the 4-th International Conference on Recent Achievements in Mechatronics, Automation, Computer Science and Robotics, MACRo’2013, Sapientia University, Tg. Mures 2013, pp. 123-134, ISSN 2247 0948. 19. Kutasi, N., Kenéz, L., Filep, E., Kelemen, A., Mátyási, Sz., “Pulsed power supply design for DC and Active Screen Plasma Nitriding”, Proc. of the 4-th International Conference on Recent Achievements in Mechatronics, Automation, Computer Science and Robotics, MACRo’2013, Sapientia University, Tg. Mures 2013, pp. 115-122, ISSN 2247 0948. 20. Kacsó, Z., Kelemen, A., Imecs, M., „Indukciós gépek rotorfluxusának azonosítása csúszómód állapotmegfigyelővel“, Proc. of the XV-th International Conference on Technical Sciences (XV. Műszaki Tudományos Ülésszak- MTÜ, Erdélyi Múzeum Egyesület- Nov., 22, 2014,Cluj-Napoca), 2015, pp. 113-120. 21. Dávid L., György K., Kelemen, A., „Modell alapú prediktív irányítási algoritmus, állapotfüggő Riccati egyenlet illetve véges horizontú DLQR algoritmusok összehasonlítása“,Proc. of the XV-th International Conference on Technical Sciences (XV. Műszaki Tudományos Ülésszak- MTÜ, Erdélyi Múzeum Egyesület- Nov., 22, 2014,Cluj-Napoca), 2015, pp. 61-74. 22. György, K., Dávid, L., Kelemen, A., “Theoretical Study of the Nonlinear Control Algorithms with Continuous and Discrete-Time State Dependent Riccati Equation”, Proc. of the 9th International Conference Interdisciplinarity in Engineering, INTER-ENG 2015, 8-9 October 2015, Tirgu-Mures, Romania, Elsevier, Procedia Technology 22 ( 2016 ), Vol. 22, 2016, pp. 582–591. 23. Kelemen, A., Biró, D., Fekete, A.-Zs., Jakab-Farkas, L., Madarász, R. R., "Macroscopic Thin Film Deposition Model for the Two-Reactive-Gas Sputtering Process", Acta Universitatis Sapientiae, Electrical and Mechanical Engineering, Scientia Publishing House, De Gruyter Open, Vol. 8 (2016), pp. 62-78, ISSN 2065-5916, DOI: 10.1515/auseme-2017-0005. 24. Fekete, A.-Zs., Kelemen, A., Jakab-Farkas, L., „Multilevel Distributed Embedded System for Control of the DC Magnetron Sputtering Process“, Acta Universitatis Sapientiae, Electrical and Mechanical Engineering, Scientia Publishing House, De Gruyter Open, Vol. 9 (2017), pp. 43-55, ISSN 2065-5916, DOI: 10.1515/auseme-2017-0004. 25. Madarász R.-R., Kelemen, A., Fekete, A.-Zs., „Plasma ignition and current control considerations for magnetron sputtering power supplies”, IEEE CANDO-EPE 2018, IEEE International Conference and Workshop in Óbuda on Electrical and Power Engineering, Nov. 20-21, 2018, Budapest, Hungary, pp. 27-31, ISBN 978-1-7281-1154-4/18, DOI: 10.1109/CANDO-EPE.2018.8601148 26. Madarász R.-R., Kelemen, A., “Stoichiometry control of the two gas reactive sputtering process”, Proc. of the 2019 IEEE 19th International Symposium on Computational Intelligence and Informatics and 7th IEEE International Conference on Recent Achievements in Mechatronics, Automation, Computer Sciences and Robotics (CINTI-MACRo), 2019, Szeged, Hungary, DOI: 10.1109/CINTI-MACRo49179.2019.9105135 27. Jakab-Farkas, L., Kelemen, A., Fekete, A.-Zs., Strnad, G., Papp, S., Vida-Simiti, I., et al., "Some remarks on the ternary TiAlSiN thin films developed under specific conditions", Acta Technica Napocensis Applied Mathematics, Mechanics, and Engineering, Vol. 61, No. 1 (2018), pp. 131-136, ISSN 1221–5872 (Thomson R. Emerging Sources Citation Index, Index Copernicus, WorldCat). 28. Ferencz J., Kelemen, A., Imecs, M., “Villamos jármű hibrid energiatároló rendszerének szabályozása”, MTÜ, A magyar tudomány napja Erdélyben, Erdélyi Múzeum-Egyesület Műszaki Tudományok Szakosztály, XXI. Műszaki tudományos ülésszak, 2020. nov. 21. 29. Madarász, R. R., Kelemen, A., Kádár, P., „Modeling reactive magnetron sputtering: a survey of different modeling approaches”, Acta Universitatis Sapientiae, Informatica, Vol. 12, 1 (2020), Scientia Publishing House, pp. 112–136, DOI: 10.2478/ausi-2020-0008. 30. Neukirchner, L. R., Magyar, A., Fodor, A., Kutasi, N. D., Kelemen, A., “Constrained predictive control of three-phase buck rectifiers”, Acta Polytechnica Hungarica, Vol. 17, No. 1, 2020, pp. 41-60, ISSN1785-8860, DOI: 10.12700/APH.17.1.2020.1.3
1. Inverter circuit for operating e.g. medium frequency-crucible furnace, has bridge circuits formed as full bridges, where inverter circuit provides single-phase energy for melting material and multi-phase energy for generating motor power, Patent Number(s): DE102006007818-A1 Inventor(s): RETTENMAIER H, BAUER M F, KELEMEN A, GASPAR C, KUTASI D N, MATYASI Z S Patent Assignee(s) and Codes(s):ITG INDUKTIONSANLAGEN GMBH (ITGI-Non-standard) Derwent Primary Accession Number: 2007-605674. 2. Prize of the Bucharest International Technical Fair TIB2008 for the product „Convertizor de frecvenţă (Frequency converter)”, built by S.C. TETRONIC SRL. 3. Power electronic converters for induction heating of low, medium and high frequency (50 Hz- 500 kHz, 1 kW- 1000 kW), with parallel, series and hybrid resonant loads. 4. High voltage DC power supplies for the magnetron sputtering process. 5. High voltage (12 kV) and high power (120 kW) DC supply for radio frequency induction heating tube oscillators. 6. DSP-based test platform for the development of boost type switch-mode three phase rectifiers and test platform for the development of induction motor control methods, based on dSPACE type real time development system. 7. Pulsed Power Supply for the Plasma-Electrolytic Oxidation Process (6kW, +/-1000V, max. 100A, 50kHz)
SAPIENTIA HUNGARIAN UNIVERSITY OF TRANSYLVANIA
The Sapientia Hungarian University of Transylvania is the independent university of the Hungarian community in Romania, which aims at providing education to the members of our community and performing scientific research on a high professional level.
Faculty of Technical and Human Sciences, Târgu-Mureș
Târgu-Mureş - Corunca, Calea Sighișoarei nr. 2.
Postal adress: 540485 Târgu-Mureş, Op. 9., Cp. 4
Tel.: +40 265 208 170, Fax: +40 265 206 211
E-mail: office@ms.sapientia.ro
