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Prof. Michal Frivaldsky
Faculty of electrical engineering and information technology, Department of mechatronics and electronics

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Research Keywords & Expertise

0 Power Electronics
0 Power Electronics Design
0 Thermal Modeling
0 simulation and verification
0 Electrical & Electronics Engineering

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Journal article
Published: 30 June 2021 in Electronics
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The aim of this work is to investigate the influence of circuit elements on the properties of the selected power factor correction (PFC) topology. Active or passive PFC serves to increase the power factor (PF) and reduce the total harmonic distortion (THD) of the mains current. As a result, the distribution network is lightened due to its interference caused by connected electronic devices. An important indicator of all electronic converters is efficiency. Therefore, the work deals with the analysis of possible efficiency improvements in conjunction with the use of technologically new active components. Detailed experimental analyses and optimization procedures are performed in terms of the influence of transistor structures (SiC and GaN) on the qualitative indicators of the proposed PFC converter for a wide operating spectrum. The synthesis of the obtained results is given, together with recommendations for optimal selection and optimal design of PFC main circuit elements with regard to achieving peak efficiency values.

ACS Style

Michal Frivaldsky; Michal Pipiska; Pavol Spanik. Evaluation of the Perspective Power Transistor Structures on Efficiency Performance of PFC Circuit. Electronics 2021, 10, 1571 .

AMA Style

Michal Frivaldsky, Michal Pipiska, Pavol Spanik. Evaluation of the Perspective Power Transistor Structures on Efficiency Performance of PFC Circuit. Electronics. 2021; 10 (13):1571.

Chicago/Turabian Style

Michal Frivaldsky; Michal Pipiska; Pavol Spanik. 2021. "Evaluation of the Perspective Power Transistor Structures on Efficiency Performance of PFC Circuit." Electronics 10, no. 13: 1571.

Journal article
Published: 12 May 2021 in Energies
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The paper deals with the determination and compensation of non-active torques of parallel HEV using an auxiliary electrical PMSM or IM motor. The non-active oscillating torque generating by the ICE engine was estimated, and consequently, the compensating torque component of the current was determined. Based on real measured data, the four regimes of operation have been investigated: compensating non-active torques, parallel operation, regenerating for PMSM, and both parallel operations, together with compensation. Using of p-q theory, the power of fundamental harmonic is presented by average values PAV, QAV of total power waveforms p(t), and q(t). Worked-out simulation results are used for sizing and dimensioning of PMSM machine, VSI inverter, and traction accumulator-battery. Circuit simulator Matlab/Simulink was used for all simulation experiments.

ACS Style

Branislav Dobrucky; Slavomir Kascak; Michal Frivaldsky; Michal Prazenica. Determination and Compensation of Non-Active Torques for Parallel HEV Using PMSM/IM Motor(s). Energies 2021, 14, 2781 .

AMA Style

Branislav Dobrucky, Slavomir Kascak, Michal Frivaldsky, Michal Prazenica. Determination and Compensation of Non-Active Torques for Parallel HEV Using PMSM/IM Motor(s). Energies. 2021; 14 (10):2781.

Chicago/Turabian Style

Branislav Dobrucky; Slavomir Kascak; Michal Frivaldsky; Michal Prazenica. 2021. "Determination and Compensation of Non-Active Torques for Parallel HEV Using PMSM/IM Motor(s)." Energies 14, no. 10: 2781.

Journal article
Published: 16 April 2021 in Applied Sciences
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The progress in technology and science leads to the invention and use of many electrical devices in the daily lives of humans. In addition to that, people have been easily exposed to increased newly generated artificial electromagnetic waves. Exponential use of modern electronic devices has automatically led to increase in electromagnetic wave exposure. Therefore, we constructed the prototype of wireless power charging system to study the biocompatibility of electromagnetic field (EMF) generated by this system on various human cell lines. There are many studies indicating the negative bio-effect of EMF on various types of cells, such as induction of apoptosis. From the other point of view, these effects could rather be beneficial in the way, that they could eliminate the progress of various diseases or disorders. For that reason, we compared the impact of EMF (87 kHz, 0.3–1.2 mT, 30 min) on human normal as well as cancer cell lines based on morphological and cellular level. Our results suggested that EMF generated by wireless power charging systems does not have any detrimental effect on cell morphology, viability and cytoskeletal structures of human neural cells.

ACS Style

Henrieta Skovierova; Miroslav Pavelek; Terezia Okajcekova; Janka Palesova; Jan Strnadel; Pavol Spanik; Erika Halašová; Michal Frivaldsky. The Biocompatibility of Wireless Power Charging System on Human Neural Cells. Applied Sciences 2021, 11, 3611 .

AMA Style

Henrieta Skovierova, Miroslav Pavelek, Terezia Okajcekova, Janka Palesova, Jan Strnadel, Pavol Spanik, Erika Halašová, Michal Frivaldsky. The Biocompatibility of Wireless Power Charging System on Human Neural Cells. Applied Sciences. 2021; 11 (8):3611.

Chicago/Turabian Style

Henrieta Skovierova; Miroslav Pavelek; Terezia Okajcekova; Janka Palesova; Jan Strnadel; Pavol Spanik; Erika Halašová; Michal Frivaldsky. 2021. "The Biocompatibility of Wireless Power Charging System on Human Neural Cells." Applied Sciences 11, no. 8: 3611.

Original paper
Published: 10 April 2021 in Electrical Engineering
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In this paper, a system for controlling the energy flow of vehicle with multiple energy storages which are used for increasing performance and driving range is presented. For achieving maximal performance and efficiency of energy flow control, traction profile of the route is necessarily known. For observation of a traction profile, Global Navigation Satellite System is used. For energy flow control, three algorithms are presented. The first proposed algorithm uses the whole traction profile of a predetermined route by the driver so the control algorithm can decide the energy of the second energy storage efficient. The second algorithm eliminates the biggest disadvantage of predetermining route, so the algorithm uses traction profile from the memory of stored routes where the vehicle was already driven. If the route was not defined or found in memory energy of secondary energy storage, (supercapacitor) using will be based on the current of primary energy storage (batteries). For verification of proposal algorithms for control of DC/DC converter which is used for energy flow control, inverter and motor were simulated with programmable load and programmable power supply.

ACS Style

Matus Danko; Branislav Hanko; Peter Drgona; Ondrej Hock. Energy flow control of electric vehicle based on GNSS. Electrical Engineering 2021, 1 -9.

AMA Style

Matus Danko, Branislav Hanko, Peter Drgona, Ondrej Hock. Energy flow control of electric vehicle based on GNSS. Electrical Engineering. 2021; ():1-9.

Chicago/Turabian Style

Matus Danko; Branislav Hanko; Peter Drgona; Ondrej Hock. 2021. "Energy flow control of electric vehicle based on GNSS." Electrical Engineering , no. : 1-9.

Journal article
Published: 10 March 2021 in Electronics
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In this paper, we describe a procedure for designing an accurate simulation model using a price-wised linear approach referred to as the power semiconductor converters of a DC microgrid concept. Initially, the selection of topologies of individual power stage blocs are identified. Due to the requirements for verifying the accuracy of the simulation model, physical samples of power converters are realized with a power ratio of 1:10. The focus was on optimization of operational parameters such as real-time behavior (variable waveforms within a time domain), efficiency, and the voltage/current ripples. The approach was compared to real-time operation and efficiency performance was evaluated showing the accuracy and suitability of the presented approach. The results show the potential for developing complex smart grid simulation models, with a high level of accuracy, and thus the possibility to investigate various operational scenarios and the impact of power converter characteristics on the performance of a smart gird. Two possible operational scenarios of the proposed smart grid concept are evaluated and demonstrate that an accurate hardware-in-the-loop (HIL) system can be designed.

ACS Style

Michal Frivaldsky; Jan Morgos; Michal Prazenica; Kristian Takacs. System Level Simulation of Microgrid Power Electronic Systems. Electronics 2021, 10, 644 .

AMA Style

Michal Frivaldsky, Jan Morgos, Michal Prazenica, Kristian Takacs. System Level Simulation of Microgrid Power Electronic Systems. Electronics. 2021; 10 (6):644.

Chicago/Turabian Style

Michal Frivaldsky; Jan Morgos; Michal Prazenica; Kristian Takacs. 2021. "System Level Simulation of Microgrid Power Electronic Systems." Electronics 10, no. 6: 644.

Book chapter
Published: 27 January 2021 in Wireless Power Transfer – Recent Development, Applications and New Perspectives [Working Title]
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The paper introduces the main issues concerned with the conceptual design process of wireless power systems. It analyses the electromagnetic design of the inductive magnetic coupler and proposes the key formulas to optimize its electrical parameters for a particular load. For this purpose, a very detailed analysis is given focusing on the mathematical concept procedure for determination of the key factors influencing proper coupling coils design. It also suggests basic topologies for conceptual design of power electronics and discusses its proper connection to the grid. The proposed design strategy is verified by experimental laboratory measurement including analyses of leakage magnetic field.

ACS Style

Vladimir Kindl; Michal Frivaldsky; Jakub Skorvaga; Martin Zavrel. Theoretical and Practical Design Approach of Wireless Power Systems. Wireless Power Transfer – Recent Development, Applications and New Perspectives [Working Title] 2021, 1 .

AMA Style

Vladimir Kindl, Michal Frivaldsky, Jakub Skorvaga, Martin Zavrel. Theoretical and Practical Design Approach of Wireless Power Systems. Wireless Power Transfer – Recent Development, Applications and New Perspectives [Working Title]. 2021; ():1.

Chicago/Turabian Style

Vladimir Kindl; Michal Frivaldsky; Jakub Skorvaga; Martin Zavrel. 2021. "Theoretical and Practical Design Approach of Wireless Power Systems." Wireless Power Transfer – Recent Development, Applications and New Perspectives [Working Title] , no. : 1.

Journal article
Published: 11 January 2021 in Applied Sciences
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This paper deals with the issues relevant for precise finite element method (FEM) modeling of thin molybdenum plates’ induction heating. The proposed methodology describes the step-by-step Multiphysics (electro-thermal) design approach, verified by the experimental measurements. Initially, it was observed that the relative error between model and experimental set-up is within the 1.2% up to 2.5% depending on the location of the measuring points. Further research was focused on the enhancement of the simulation model in the form of its parametrization. It means that it is easy to define the induction coil’s operational parameters and geometrical properties (ferrite shape, operating frequency, the distance between plate and heating element, the value of coil current, etc.). The target of this approach is to be able to determine the optimal operational settings targeting the required heating performance of thin molybdenum plates. One of the main requirements regarding the optimal heating process is temperature distribution within the molybdenum plate’s surface. The proposed model makes it possible to obtain information on optimal operational conditions based on the received results.

ACS Style

Michal Frivaldsky; Miroslav Pavelek; Tibor Donic. Modeling and Experimental Verification of Induction Heating of Thin Molybdenum Sheets. Applied Sciences 2021, 11, 647 .

AMA Style

Michal Frivaldsky, Miroslav Pavelek, Tibor Donic. Modeling and Experimental Verification of Induction Heating of Thin Molybdenum Sheets. Applied Sciences. 2021; 11 (2):647.

Chicago/Turabian Style

Michal Frivaldsky; Miroslav Pavelek; Tibor Donic. 2021. "Modeling and Experimental Verification of Induction Heating of Thin Molybdenum Sheets." Applied Sciences 11, no. 2: 647.

Journal article
Published: 17 December 2020 in Energies
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This paper deals with in loop design of coupling elements of the wireless charging systems (WChS). The in-loop design is created as a script/User Interface (UI) in MATLAB environment, which is based on finite element models of WChS. Main aim of developed tool is to easily identify the optimal geometrical parameters of the coupling coils. The optimization of the coil’s geometrical and electrical parameters is specified by an algorithm, which is based on definition for transfer of required amount of power and on geometrical restrictions of the target application. The second part of the proposed script/UI is used for user guided design of the electromagnetic shielding. It enables to optimize the shielding parameters in order to reach the limits defined by international standards for safety levels with respect to human exposure. Proposed design methodology together with user interface have been verified though experimental validation. For this purpose, construction of WChS was realized based on the results from in loop design process. Comparisons have been made according to the evaluation of simulation model´s accuracy, that is, the values of self-inductances, mutual inductances, coupling coefficient and gain characteristics have been evaluated (simulations vs. experiments). At the end of the paper the evaluation of the shielding performance was realized, while once more the comparison between simulation and experiments have been made. Received results are showing less than 2% of the relative error. Using presented methodology, the fast optimization actions can be done during design and modelling of WChS.

ACS Style

Michal Frivaldsky; Miroslav Pavelek. In Loop Design of the Coils and the Electromagnetic Shielding Elements for the Wireless Charging Systems. Energies 2020, 13, 6661 .

AMA Style

Michal Frivaldsky, Miroslav Pavelek. In Loop Design of the Coils and the Electromagnetic Shielding Elements for the Wireless Charging Systems. Energies. 2020; 13 (24):6661.

Chicago/Turabian Style

Michal Frivaldsky; Miroslav Pavelek. 2020. "In Loop Design of the Coils and the Electromagnetic Shielding Elements for the Wireless Charging Systems." Energies 13, no. 24: 6661.

Journal article
Published: 01 October 2020 in Communications - Scientific letters of the University of Zilina
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Presented paper deals with possibility of recovery of damaged traction batteries by deep discharge. For the test of proposed charging algorithm, new, unused cell was selected, the deeply discharged condition of which was caused by the self-discharge during the improper storage. The cell had significant damage of package in the central part. For the battery testing, experimental set-up was realized for automated recovering procedure and other tests of cells. For verification of the proposed algorithm, a recovered cell was compared to a reference/new cell by testing the delivered ampere-hours for various discharging current. The final evaluation shows that the proposed algorithm for recovery of the deeply discharged cell can recover up to 70% of the nominal cell capacity.

ACS Style

Matus Danko; Juraj Adamec; Peter Drgona; Michal Frivaldsky. Recovery Procedure for Deeply Discharged LiFePo4 Traction Battery. Communications - Scientific letters of the University of Zilina 2020, 22, 121 -127.

AMA Style

Matus Danko, Juraj Adamec, Peter Drgona, Michal Frivaldsky. Recovery Procedure for Deeply Discharged LiFePo4 Traction Battery. Communications - Scientific letters of the University of Zilina. 2020; 22 (4):121-127.

Chicago/Turabian Style

Matus Danko; Juraj Adamec; Peter Drgona; Michal Frivaldsky. 2020. "Recovery Procedure for Deeply Discharged LiFePo4 Traction Battery." Communications - Scientific letters of the University of Zilina 22, no. 4: 121-127.

Journal article
Published: 29 September 2020 in Energies
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In this paper, the modeling methodology of the AC drive system with a Parallel Quasi-Resonant DC Link Inverter (PQRDCLI) is described. A presented modeling approach is an attractive tool used for the effective evaluation of a common-mode (CM) voltage and grounds current reduction methods. Designed models of inverter, induction machine (IM), and cable are simple, thus the methods for parameter extraction are not complicated. Verification of the proposed modeling approach was realized with the use of the the Synopsys (Mountain View, CA, USA) SABER simulator, while simulation results were experimentally verified. Operation principles of the proposed PQRDCLI converter topology are also described. Based on simulation and experimental results, it was confirmed that the proposed PQRDCLI solution represents required performance within the reduction of common-mode voltage and ground current in electric drives. Moreover, comparisons from a simulation complexity point of view have been performed to the existing methods. The evaluation is being shown at the end of the paper. It is confirmed that the presented method is simple, fast, accurate, and robust as well.

ACS Style

Marek Turzyński; Michal Frivaldsky. Modeling of a Quasi-Resonant DC Link Inverter Dedicated to Common-Mode Voltage and Ground Current Reduction. Energies 2020, 13, 5090 .

AMA Style

Marek Turzyński, Michal Frivaldsky. Modeling of a Quasi-Resonant DC Link Inverter Dedicated to Common-Mode Voltage and Ground Current Reduction. Energies. 2020; 13 (19):5090.

Chicago/Turabian Style

Marek Turzyński; Michal Frivaldsky. 2020. "Modeling of a Quasi-Resonant DC Link Inverter Dedicated to Common-Mode Voltage and Ground Current Reduction." Energies 13, no. 19: 5090.

Journal article
Published: 07 August 2020 in Elektronika ir Elektrotechnika
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The paper deals with the experimental analysis of the switching performance of selected GaN (Galium Nitride) power transistor, whose use is then expected in bidirectional buck/boost DC-DC converter. The switching performance was evaluated through highly accurate and verified simulation models of GS61008P transistor from GaN systems. Experiments have been provided for a wide spectrum of switching frequency and load current in order to verify transistor performance. Then, based on the results, it was expected that high-frequency operation (above 500 kHz) should not distort the efficiency performance of the designed bidirectional converter. This was confirmed after laboratory measurements of the efficiency of the proposed DC-DC converter, while operation under very high switching frequency was more effective compared to low-frequency operation. Over 95 % of efficiency was achieved for both buck and boost mode (125 W), even switching frequency was above 500 kHz.

ACS Style

Michal Frivaldsky; Jan Morgos; Richard Zelnik. Evaluation of GaN Power Transistor Switching Performance on Characteristics of Bidirectional DC-DC Converter. Elektronika ir Elektrotechnika 2020, 26, 18 -24.

AMA Style

Michal Frivaldsky, Jan Morgos, Richard Zelnik. Evaluation of GaN Power Transistor Switching Performance on Characteristics of Bidirectional DC-DC Converter. Elektronika ir Elektrotechnika. 2020; 26 (4):18-24.

Chicago/Turabian Style

Michal Frivaldsky; Jan Morgos; Richard Zelnik. 2020. "Evaluation of GaN Power Transistor Switching Performance on Characteristics of Bidirectional DC-DC Converter." Elektronika ir Elektrotechnika 26, no. 4: 18-24.

Journal article
Published: 26 June 2020 in Energies
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In this article, the practical comparison of the operational performance of the modular (or multiport) and non-modular bidirectional buck/boost (bi-BB) DC/DC converter is realized. The main contribution of the work is the evaluation of both concepts based on various aspects, considering the qualitative indicators of the systems relevant for microgrids. Here, we discuss efficiency, electrical properties, costs, and component values. At the same time, critical comparisons are provided for converters based on SiC and GaN technology (non-modular high-voltage SiC-based dual-interleaved converter and modular low-voltage GaN-based). The concepts are specific with their operating frequency, whereby for each solution, the switching frequency is different and directly influences relevant components. The efficiency, overall system volume, output voltage ripple, and input current ripple are compared mutually between both concepts with a dependency on power delivery. These factors, together with overall volume and costs, are very important considering modern converters for microgrid systems. The summary of pros and cons is realized for each of the proposed converters, whereby the evaluation criterion is reflected within the electrical properties targeting microgrid application.

ACS Style

Michal Frivaldsky; Slavomir Kascak; Jan Morgos; Michal Prazenica. From Non-Modular to Modular Concept of Bidirectional Buck/Boost Converter for Microgrid Applications. Energies 2020, 13, 3287 .

AMA Style

Michal Frivaldsky, Slavomir Kascak, Jan Morgos, Michal Prazenica. From Non-Modular to Modular Concept of Bidirectional Buck/Boost Converter for Microgrid Applications. Energies. 2020; 13 (12):3287.

Chicago/Turabian Style

Michal Frivaldsky; Slavomir Kascak; Jan Morgos; Michal Prazenica. 2020. "From Non-Modular to Modular Concept of Bidirectional Buck/Boost Converter for Microgrid Applications." Energies 13, no. 12: 3287.

Journal article
Published: 02 June 2020 in Electronics
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The presented paper discusses the most often damages applying for lithium traction and non-traction cells. The focus is therefore given on investigation of possibilities related to the recovery of such damaged lithium-ion batteries, more specifically after long-term short-circuit and deep discharge. For this purpose, initially, the short-circuit was applied to the selected type of traction LiFePO4 cell. Also, the deeply discharged cell was identified and observed. Both damaged cells would exhibit visible damage if electro-mechanical properties were measured. Individual types of damage require a different approach for battery regeneration to recover cells as much as possible. For this purpose, experimental set-up for automated system integrating proposed recovery methods were realized, while battery under test undergone a full-range of regeneration procedure. As a verification of the proposed regeneration algorithms, the test of delivered Ampere-hours (Ah) for various discharging currents was realized both for short-circuited as well as deeply discharged cells. Received results have been compared to the new/referenced cell, which undergoes the same test of delivered Ah. From the final evaluation is seen, that proposed procedure can recover damaged cell up to 80% of its full capacity if short-circuit was applied, or 70% if a deeply discharged cell is considered.

ACS Style

Pavol Spanik; Michal Frivaldsky; Juraj Adamec; Matus Danko. Battery Charging Procedure Proposal Including Regeneration of Short-Circuited and Deeply Discharged LiFePO4 Traction Batteries. Electronics 2020, 9, 929 .

AMA Style

Pavol Spanik, Michal Frivaldsky, Juraj Adamec, Matus Danko. Battery Charging Procedure Proposal Including Regeneration of Short-Circuited and Deeply Discharged LiFePO4 Traction Batteries. Electronics. 2020; 9 (6):929.

Chicago/Turabian Style

Pavol Spanik; Michal Frivaldsky; Juraj Adamec; Matus Danko. 2020. "Battery Charging Procedure Proposal Including Regeneration of Short-Circuited and Deeply Discharged LiFePO4 Traction Batteries." Electronics 9, no. 6: 929.

Conference paper
Published: 01 June 2020 in 2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM)
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Presented paper shows possibilities related to procedure proposal on how to recover damaged lithium-ion battery cell after long-term short-circuit. For this purpose, initially the short-circuit was applied on selected type of traction LiFePO4 cell. After it, the visible damage was identified from mechanical and electrical point of view. Next, experimental setup for automated application of proposed recovery method was realized, while battery under test undergoes full-range regeneration procedure. As a verification of the proposed regeneration algorithm, the test of delivered Ah for various discharging currents was realized. Received results have been compared to the new cell, which undergone also the test of delivered Ah. From the final evaluation is seen, that proposed procedure is able to recover damaged cell up to 80% of its full capacity.

ACS Style

Michal Frivaldsky; Juraj Adamec; Matus Danko; Peter Drgona. Traction battery (40 Ah LiFePO4) recovery after long-term short circuit. 2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM) 2020, 299 -304.

AMA Style

Michal Frivaldsky, Juraj Adamec, Matus Danko, Peter Drgona. Traction battery (40 Ah LiFePO4) recovery after long-term short circuit. 2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM). 2020; ():299-304.

Chicago/Turabian Style

Michal Frivaldsky; Juraj Adamec; Matus Danko; Peter Drgona. 2020. "Traction battery (40 Ah LiFePO4) recovery after long-term short circuit." 2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM) , no. : 299-304.

Journal article
Published: 27 May 2020 in Energies
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The paper briefly discusses the most important standards and regulations established for high-power wireless power transfer systems and introduces the main issues concerned with the conceptual design process. It analyses the electromagnetic design of the inductive magnetic coupler and proposes key formulas to optimize its electrical parameters for a particular load. The method applies to both the resistive load and the battery charging. It also suggests basic topologies for conceptual design of power electronics and discusses its proper connection to the grid. The proposed design strategy is verified by experimental laboratory measurement including analyses of the leakage magnetic field.

ACS Style

Vladimir Kindl; Michal Frivaldsky; Martin Zavrel; Miroslav Pavelek. Generalized Design Approach on Industrial Wireless Chargers. Energies 2020, 13, 2697 .

AMA Style

Vladimir Kindl, Michal Frivaldsky, Martin Zavrel, Miroslav Pavelek. Generalized Design Approach on Industrial Wireless Chargers. Energies. 2020; 13 (11):2697.

Chicago/Turabian Style

Vladimir Kindl; Michal Frivaldsky; Martin Zavrel; Miroslav Pavelek. 2020. "Generalized Design Approach on Industrial Wireless Chargers." Energies 13, no. 11: 2697.

Journal article
Published: 25 April 2020 in Elektronika ir Elektrotechnika
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The aim of the proposed paper is discussing problematics related to the thermal modelling of power electronic components. More in detail, the electro-thermal relationship is investigated for the selected power diode, while analysis shall serve for system optimization considering thermal performance with the use of highly accurate 3D simulation model. The presented approach describes the procedure of the simulation model development, whereby the main part is discussing necessities relevant for material property identification through the indirect procedure, i.e, material properties are not known from the manufacturer. Electro-thermal dependencies are defined within the proposed model, while this model enables parametric changes of the geometrical properties of the device. Added value of this procedure is the possibility of its use in exact determination of the lifetime of a semiconductor component using mathematical models taking into account operational variables (current, voltage, temperature, etc.). The proposed model is verified and validated through thermovision experimental measurements within defined operational conditions.

ACS Style

Miroslav Pavelek; Michal Frivaldsky; Peter Sojka; Jan Morgos. Electro-Thermal Modelling and Experimental Verification of Power Semiconductor Diode. Elektronika ir Elektrotechnika 2020, 26, 48 -53.

AMA Style

Miroslav Pavelek, Michal Frivaldsky, Peter Sojka, Jan Morgos. Electro-Thermal Modelling and Experimental Verification of Power Semiconductor Diode. Elektronika ir Elektrotechnika. 2020; 26 (2):48-53.

Chicago/Turabian Style

Miroslav Pavelek; Michal Frivaldsky; Peter Sojka; Jan Morgos. 2020. "Electro-Thermal Modelling and Experimental Verification of Power Semiconductor Diode." Elektronika ir Elektrotechnika 26, no. 2: 48-53.

Original paper
Published: 21 March 2020 in Electrical Engineering
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This paper presents practical design procedure of the electric measuring circuit and evaluation/communication unit of the multi-cell series–parallel connection of traction lead-acid batteries. The target use is online SOC monitoring during the operation of automated guided vehicle (AGV), which is being used for in-house automated industrial processes. Based on the state-of-the-art review, proper methodology for SOC determination was selected for the given lead-acid battery technology. For that purpose, the measuring procedure for identification of the battery equivalent circuit was initially realized and is being described within the main text. The results from the equivalent circuit identification were used for design of the precise measuring circuit which is responsible for the determination of SOC levels based on selected methodologies. These methodologies were implemented within evaluating unit (MCU), while functionality of the proposed system for the SOC identification was tested and evaluated within standard operational conditions of AGV robot.

ACS Style

Michal Frivaldsky; Jozef Sedo; Michal Pipiska; Matus Danko. Design of measuring and evaluation unit for multi-cell traction battery system of industrial AGV. Electrical Engineering 2020, 102, 1579 -1591.

AMA Style

Michal Frivaldsky, Jozef Sedo, Michal Pipiska, Matus Danko. Design of measuring and evaluation unit for multi-cell traction battery system of industrial AGV. Electrical Engineering. 2020; 102 (3):1579-1591.

Chicago/Turabian Style

Michal Frivaldsky; Jozef Sedo; Michal Pipiska; Matus Danko. 2020. "Design of measuring and evaluation unit for multi-cell traction battery system of industrial AGV." Electrical Engineering 102, no. 3: 1579-1591.

Original paper
Published: 10 March 2020 in Electrical Engineering
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This article deals with analysis of the operational characteristics of series–series compensated WPT system, while the focus is given on the most suitable operational point considering system efficiency and power delivery. Initially, the investigation of transfer characteristics of the proposed WPT system is done through mathematical analysis. Results from mathematical analysis are showing certain specifics, which are useful for the optimization of the control system design. These specifics are related to the control variable, which for presented solution is a phase shift between current and voltage on the primary side of WPT system. Utilizing phase-locked loop, it is possible to achieve very high operational efficiencies together with peak power delivery even if radial or axial displacement applies. The proposed system is verified for certain frequency range, which is related to the parameters of the proposed WPT system. At the end of the paper, designed control system is verified on the experimental prototype of wireless charger at certain operational conditions (variations of axial displacements). Presented solution is characterized by its low complexity and high functionality if high power density of WPT systems is required.

ACS Style

Michal Frivaldsky; Viliam Jaros; Pavol Spanik; Miroslav Pavelek. Control system proposal for detection of optimal operational point of series–series compensated wireless power transfer system. Electrical Engineering 2020, 102, 1423 -1432.

AMA Style

Michal Frivaldsky, Viliam Jaros, Pavol Spanik, Miroslav Pavelek. Control system proposal for detection of optimal operational point of series–series compensated wireless power transfer system. Electrical Engineering. 2020; 102 (3):1423-1432.

Chicago/Turabian Style

Michal Frivaldsky; Viliam Jaros; Pavol Spanik; Miroslav Pavelek. 2020. "Control system proposal for detection of optimal operational point of series–series compensated wireless power transfer system." Electrical Engineering 102, no. 3: 1423-1432.

Editorial
Published: 05 March 2020 in Electrical Engineering
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Correspondence to Michal Frivaldský. Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. Reprints and Permissions Frivaldský, M. Emerging trends in power electronics, electric drives, power and energy storage systems. Electr Eng (2020). https://doi.org/10.1007/s00202-020-00961-4 Download citation Published: 05 March 2020 DOI: https://doi.org/10.1007/s00202-020-00961-4

ACS Style

Michal Frivaldský. Emerging trends in power electronics, electric drives, power and energy storage systems. Electrical Engineering 2020, 102, 1 -1.

AMA Style

Michal Frivaldský. Emerging trends in power electronics, electric drives, power and energy storage systems. Electrical Engineering. 2020; 102 (1):1-1.

Chicago/Turabian Style

Michal Frivaldský. 2020. "Emerging trends in power electronics, electric drives, power and energy storage systems." Electrical Engineering 102, no. 1: 1-1.

Journal article
Published: 06 December 2019 in Elektronika ir Elektrotechnika
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Paper focuses on the topic related to State of Charge (SOC) estimation of the battery modules. The design issues of the electronic circuit suited for very accurate voltage and current measurement used for evaluation of the SOC parameters of battery module (NexSys 12 V) are presented. The SOC evaluation is not described here, but the principles are based on the open-circuit voltage measurement in combination with the coulomb counting method. Both methods are considered within the practical design of the measuring circuit of traction lead-acid batteries connected in series (3 cells). The circuit proposal is verified by the simulation model and consequently by the experimental measurement. Mutual comparisons are done for each battery within the module. The results show a very high accuracy between the simulation and measurement, while the relative tolerance varies from - 7 % to 1 % within wide measuring ranges.

ACS Style

Michal Pipiska; Michal Frivaldsky; Matus Danko; Jozef Sedo. Electronically Isolated Measuring Circuit for Multicell Traction Battery Modules Identifying State of Charge (SOC) Values. Elektronika ir Elektrotechnika 2019, 25, 22 -27.

AMA Style

Michal Pipiska, Michal Frivaldsky, Matus Danko, Jozef Sedo. Electronically Isolated Measuring Circuit for Multicell Traction Battery Modules Identifying State of Charge (SOC) Values. Elektronika ir Elektrotechnika. 2019; 25 (6):22-27.

Chicago/Turabian Style

Michal Pipiska; Michal Frivaldsky; Matus Danko; Jozef Sedo. 2019. "Electronically Isolated Measuring Circuit for Multicell Traction Battery Modules Identifying State of Charge (SOC) Values." Elektronika ir Elektrotechnika 25, no. 6: 22-27.