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Dr. Zbigniew Waradzyn
AGH University of Science and Technology in Krakow

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0 Energy Conversion
0 Induction Heating
0 resonant circuit
0 DC-DC converters
0 Resonant converters

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Induction Heating
Resonant converters
resonant circuit

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Journal article
Published: 12 August 2021 in IEEE Access
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This paper presents a novel concept of a high-voltage-gain DC-DC converter. The converter is made up of switched capacitors and passive resonant branches. A significant reduction in the count of switches and low voltage stress on the switches is achieved in this proposed converter topology, in comparison to that of a classical SC series-parallel converter. It is essential from the cost, volume, and efficiency of the converter standpoint. The reduction in the count of switches is threefold. The highest voltage stress on the switches depends on the output voltage and is decreased in the proposed converter as well, as the output voltage is divided into two series-connected capacitors. The presented results demonstrate the operation of the converter with the use of resonant branches, its switching strategies, voltage stresses of switches, efficiency, voltage gain, and output voltage regulation as well as the zero-voltage switching (ZVS) operation. The paper also presents novel issues related to analytical loss modeling, extended concepts of topology, converter start-up, and operation during transient states. The demonstrated concept of the converter, the analytical discussion and its design, as well as the experimental setup and results clearly demonstrate the optimization achievements.

ACS Style

Robert Stala; Maciej Chojowski; Zbigniew Waradzyn; Andrzej Mondzik; Szymon Folmer; Adam Penczek; Aleksander Skala; Stanislaw Pirog. High-Gain Switched-Capacitor DC-DC Converter With Low Count of Switches and Low Voltage Stress of Switches. IEEE Access 2021, 9, 114267 -114281.

AMA Style

Robert Stala, Maciej Chojowski, Zbigniew Waradzyn, Andrzej Mondzik, Szymon Folmer, Adam Penczek, Aleksander Skala, Stanislaw Pirog. High-Gain Switched-Capacitor DC-DC Converter With Low Count of Switches and Low Voltage Stress of Switches. IEEE Access. 2021; 9 ():114267-114281.

Chicago/Turabian Style

Robert Stala; Maciej Chojowski; Zbigniew Waradzyn; Andrzej Mondzik; Szymon Folmer; Adam Penczek; Aleksander Skala; Stanislaw Pirog. 2021. "High-Gain Switched-Capacitor DC-DC Converter With Low Count of Switches and Low Voltage Stress of Switches." IEEE Access 9, no. : 114267-114281.

Journal article
Published: 03 December 2020 in Energies
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This paper presents a concept for the operation of a resonant DC–DC switched-capacitor converter with very high efficiency and output voltage regulation. In its basic concept, such a converter operates as a switched-capacitor voltage doubler (SCVD) in the Zero Current Switching (ZCS) mode with a constant output voltage. The proposed methods of switching allow for the switched-capacitor (SC) converter output voltage regulation, and improve its efficiency by the operation with Zero Voltage Switching (ZVS). In this paper, various switching patterns are proposed to achieve high efficiency and the output voltage control by frequency or duty cycle regulation. Some examples of the application of the proposed switching patterns are presented: in current control at the start-up of the converter, in a bi-directional converter, and in a modular cascaded system. The paper also presents an analytical model as well as the relationships between the switching frequency, voltage ratio and efficiency. Further, it demonstrates the experimental verification of the waveforms, voltage ratios, as well as efficiency. The proposed experimental setup achieved a maximum efficiency of 99.228%. The implementation of the proposed switching patterns with the ZVS operation along with the GaN-based (Gallium Nitride) design, with a planar choke, leads to a high-efficiency and low-volume solution for the SCVD converter and is competitive with the switch-mode step-up converters.

ACS Style

Zbigniew Waradzyn; Robert Stala; Andrzej Mondzik; Aleksander Skała; Adam Penczek. GaN-Based DC-DC Resonant Boost Converter with Very High Efficiency and Voltage Gain Control. Energies 2020, 13, 6403 .

AMA Style

Zbigniew Waradzyn, Robert Stala, Andrzej Mondzik, Aleksander Skała, Adam Penczek. GaN-Based DC-DC Resonant Boost Converter with Very High Efficiency and Voltage Gain Control. Energies. 2020; 13 (23):6403.

Chicago/Turabian Style

Zbigniew Waradzyn; Robert Stala; Andrzej Mondzik; Aleksander Skała; Adam Penczek. 2020. "GaN-Based DC-DC Resonant Boost Converter with Very High Efficiency and Voltage Gain Control." Energies 13, no. 23: 6403.

Journal article
Published: 29 October 2020 in Energies
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This paper presents a new concept and research results of DC-DC high-voltage-gain, high-frequency step-up resonant converters. The proposed topologies are optimized towards minimizing the number of switches and improvements in efficiency. Another relevant advantage of such type of converters is that they have a common input and output negative point. The proposed converters are based on the resonant switched-capacitor voltage multiplier circuit, and that is why they are compared with a classic converter from this family. The included results show the operating principle, possible switching methods with the consideration of their impact on the voltage gain level, as well as the voltage and current ripples. The operating concepts and analytical calculations are confirmed by simulation and experimental results.

ACS Style

Robert Stala; Zbigniew Waradzyn; Szymon Folmer. DC-DC High-Voltage-Gain Converters with Low Count of Switches and Common Ground. Energies 2020, 13, 5657 .

AMA Style

Robert Stala, Zbigniew Waradzyn, Szymon Folmer. DC-DC High-Voltage-Gain Converters with Low Count of Switches and Common Ground. Energies. 2020; 13 (21):5657.

Chicago/Turabian Style

Robert Stala; Zbigniew Waradzyn; Szymon Folmer. 2020. "DC-DC High-Voltage-Gain Converters with Low Count of Switches and Common Ground." Energies 13, no. 21: 5657.

Conference paper
Published: 01 September 2019 in 2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe)
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ACS Style

Robert Stala; Zbigniew Waradzyn; Andrzej Mondzik; Adam Penczek; Aleksander Skala. DC–DC High Step-up Converter with Low Count of Switches Based on Resonant Switched-Capacitor Topology. 2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe) 2019, 1 .

AMA Style

Robert Stala, Zbigniew Waradzyn, Andrzej Mondzik, Adam Penczek, Aleksander Skala. DC–DC High Step-up Converter with Low Count of Switches Based on Resonant Switched-Capacitor Topology. 2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe). 2019; ():1.

Chicago/Turabian Style

Robert Stala; Zbigniew Waradzyn; Andrzej Mondzik; Adam Penczek; Aleksander Skala. 2019. "DC–DC High Step-up Converter with Low Count of Switches Based on Resonant Switched-Capacitor Topology." 2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe) , no. : 1.

Journal article
Published: 17 November 2018 in Power Electronics and Drives
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This paper presents the results of experimental research of a resonant switched capacitor voltage multiplier in a cost-effective topology (CESCVM) with a limited number of active switches. In the charging mode of the switched capacitors, the converter utilizes only one active switch and a required number of diodes. Therefore, the cost of the converter is decreased as compared with that of a classical SCVM converter, owing to a lower number of switches and gate driver circuits, as well as a smaller PCB area. Moreover, the CESCVM has simpler control circuits and higher reliability. This paper presents the original experimental results of the operation of the CESCVM converter. A concept of the bootstrap supply of gate drivers of the flying switches is also examined.

ACS Style

Zbigniew Waradzyn; Robert Stala; Aleksander Skała; Andrzej Mondzik; Adam Penczek. A Cost-Effective Resonant Switched-Capacitor DC-DC Boost Converter – Experimental Results and Feasibility Model. Power Electronics and Drives 2018, 3, 75 -83.

AMA Style

Zbigniew Waradzyn, Robert Stala, Aleksander Skała, Andrzej Mondzik, Adam Penczek. A Cost-Effective Resonant Switched-Capacitor DC-DC Boost Converter – Experimental Results and Feasibility Model. Power Electronics and Drives. 2018; 3 (1):75-83.

Chicago/Turabian Style

Zbigniew Waradzyn; Robert Stala; Aleksander Skała; Andrzej Mondzik; Adam Penczek. 2018. "A Cost-Effective Resonant Switched-Capacitor DC-DC Boost Converter – Experimental Results and Feasibility Model." Power Electronics and Drives 3, no. 1: 75-83.

Conference paper
Published: 01 November 2018 in 2018 Conference on Electrotechnology: Processes, Models, Control and Computer Science (EPMCCS)
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Resonant inverters are widely applied in induction heating applications. A voltage-fed series resonant inverter (SRI) is frequently used as a reliable and cost-effective converter, providing various power control strategies. This paper analyses the load current harmonics content in an SRI for induction heating controlled using particular cases of the Asymmetrical Voltage-Cancellation (AVC) control strategy, belonging to fixed-frequency control techniques. The analysis is carried out for the inverter operation at the minimum values of frequencies guaranteeing zero-voltage switching, and at the fixed frequencies assuring power control in an assumed range of power. Moreover, the impact of the quality factor of the load circuit has been taken into account. The values of the total harmonic distortion (THD) of the load current occurring in Asymmetrical Duty-Cycle (ADC), Phase-Shift Control (PSC) and Asymmetrical Clamped Mode (ACM) control techniques have been determined and compared. The results of mathematical analysis are verified using MATLAB/Simulink simulations. This in-depth analysis and the results obtained are some novel contributions to the existing knowledge of the properties of the aforementioned control strategies of an SRI for induction heating.

ACS Style

Zbigniew Waradzyn; Adam Penczek; Aleksander Skala. Analysis of the Load Current Harmonics Content in a Series Resonant Inverter for Induction Heating Controlled Using Various Cases of the AVC Control Strategy. 2018 Conference on Electrotechnology: Processes, Models, Control and Computer Science (EPMCCS) 2018, 1 -9.

AMA Style

Zbigniew Waradzyn, Adam Penczek, Aleksander Skala. Analysis of the Load Current Harmonics Content in a Series Resonant Inverter for Induction Heating Controlled Using Various Cases of the AVC Control Strategy. 2018 Conference on Electrotechnology: Processes, Models, Control and Computer Science (EPMCCS). 2018; ():1-9.

Chicago/Turabian Style

Zbigniew Waradzyn; Adam Penczek; Aleksander Skala. 2018. "Analysis of the Load Current Harmonics Content in a Series Resonant Inverter for Induction Heating Controlled Using Various Cases of the AVC Control Strategy." 2018 Conference on Electrotechnology: Processes, Models, Control and Computer Science (EPMCCS) , no. : 1-9.

Conference paper
Published: 01 November 2018 in 2018 Conference on Electrotechnology: Processes, Models, Control and Computer Science (EPMCCS)
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High efficiency technology of waste heat energy utilization would change the face of the energy market. Due to the fact that the energy system and transport are based on fossil fuels, there is a huge potential for its efficient use. Despite the fact that the technology of Peltier semiconductor modules has been known for many years, there are no solutions that might be commonly disseminated. There is also a deficit of available sources that in a transparent, coherent and synthetic way could provide guidelines for the constructors of such devices, and show how much energy they can generate and what efficiency they have. Moreover, the Peltier modules available on the market are burdened with many stereotypes. When trying to use this technology, it should be remembered that in addition to the Peltier phenomenon, the module's operation is based on four other physical phenomena: two of them have a negative impact and they determine the practically obtained parameters of the Peltier module. These are: Joule effect and heat conduction phenomenon. The other two phenomena: Seebeck and Thomson ones, play slightly smaller roles. The aim of the authors was to investigate the self-made model of a thermoelectric generator TEG, constructed using Peltier modules. The paper presents the results of measurements and the method of determining the electrical efficiency of this model. Additionally, a temperature range was determined at that such recovery has a measurable utilitarian aspect and economic sense. The limitations of semiconductor technology of Peltier cells have been given, and design guidelines at construction process of such systems to optimize their efficiency are presented.

ACS Style

Aleksander Skala; Zbigniew Waradzyn. Investigation and Determination of Efficiency of the Waste Heat Recovery System Using Peltier Modules. 2018 Conference on Electrotechnology: Processes, Models, Control and Computer Science (EPMCCS) 2018, 1 -5.

AMA Style

Aleksander Skala, Zbigniew Waradzyn. Investigation and Determination of Efficiency of the Waste Heat Recovery System Using Peltier Modules. 2018 Conference on Electrotechnology: Processes, Models, Control and Computer Science (EPMCCS). 2018; ():1-5.

Chicago/Turabian Style

Aleksander Skala; Zbigniew Waradzyn. 2018. "Investigation and Determination of Efficiency of the Waste Heat Recovery System Using Peltier Modules." 2018 Conference on Electrotechnology: Processes, Models, Control and Computer Science (EPMCCS) , no. : 1-5.

Journal article
Published: 09 July 2018 in IEEE Transactions on Industrial Electronics
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This paper presents research results of voltage gain number control methods of a power electronic resonant zero-current switching (ZCS) dc-dc switched-capacitor (SC) voltage multiplier (SCVM) in a topology with fault tolerance capability (FSCVM). The converters operated under the basic switching patterns are constant-voltage-gain dc-dc series-parallel resonant SC converters. However, this paper presents a method for the output voltage regulation by a special switching strategy. A variable voltage gain is made possible by selecting the number of active switching cells, using an appropriate control method. This creates a set of voltage ratio ranges. In addition, the proposed topology and method of control enable a fault-tolerant operation of the FSCVM under various failures of the device. The paper presents an analysis of the concept, simulation results and an experimental verification in a three-cell FSCVM dc-dc resonant boost converter operating at a 200 watt charge. Issues regarding the selection of components related to the problem of inrush currents which can occur during the voltage ratio increase are also analyzed in this paper, and the design for low inrush currents is demonstrated.

ACS Style

Robert Stala; Zbigniew Waradzyn; Adam Penczek; Andrzej Mondzik; Aleksander Skala. A Switched-Capacitor DC–DC Converter With Variable Number of Voltage Gains and Fault-Tolerant Operation. IEEE Transactions on Industrial Electronics 2018, 66, 3435 -3445.

AMA Style

Robert Stala, Zbigniew Waradzyn, Adam Penczek, Andrzej Mondzik, Aleksander Skala. A Switched-Capacitor DC–DC Converter With Variable Number of Voltage Gains and Fault-Tolerant Operation. IEEE Transactions on Industrial Electronics. 2018; 66 (5):3435-3445.

Chicago/Turabian Style

Robert Stala; Zbigniew Waradzyn; Adam Penczek; Andrzej Mondzik; Aleksander Skala. 2018. "A Switched-Capacitor DC–DC Converter With Variable Number of Voltage Gains and Fault-Tolerant Operation." IEEE Transactions on Industrial Electronics 66, no. 5: 3435-3445.

Journal article
Published: 05 April 2018 in PRZEGLĄD ELEKTROTECHNICZNY
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Wydawnictwo SIGMA-NOT wydaje czasopisma fachowe informuj

ACS Style

Zbigniew Waradzyn. Induction heating with a fixed control frequency guaranteeing ZVS at varying parameters of the resonant circuit. PRZEGLĄD ELEKTROTECHNICZNY 2018, 1, 101 -104.

AMA Style

Zbigniew Waradzyn. Induction heating with a fixed control frequency guaranteeing ZVS at varying parameters of the resonant circuit. PRZEGLĄD ELEKTROTECHNICZNY. 2018; 1 (4):101-104.

Chicago/Turabian Style

Zbigniew Waradzyn. 2018. "Induction heating with a fixed control frequency guaranteeing ZVS at varying parameters of the resonant circuit." PRZEGLĄD ELEKTROTECHNICZNY 1, no. 4: 101-104.

Conference paper
Published: 01 September 2017 in 2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe)
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ACS Style

Adam Penczek; Andrzej Mondzik; Zbigniew Waradzyn; Robert Stala; Aleksander Skala; Stanislaw Pirog. Switching strategies of a resonant switched-capacitor voltage multiplier. 2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe) 2017, 1 .

AMA Style

Adam Penczek, Andrzej Mondzik, Zbigniew Waradzyn, Robert Stala, Aleksander Skala, Stanislaw Pirog. Switching strategies of a resonant switched-capacitor voltage multiplier. 2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe). 2017; ():1.

Chicago/Turabian Style

Adam Penczek; Andrzej Mondzik; Zbigniew Waradzyn; Robert Stala; Aleksander Skala; Stanislaw Pirog. 2017. "Switching strategies of a resonant switched-capacitor voltage multiplier." 2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe) , no. : 1.

Journal article
Published: 26 April 2017 in IEEE Transactions on Industrial Electronics
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This paper presents the investigation results of the efficiency of power electronic resonant zero-current switching dc-dc switched-capacitor voltage multipliers (SCVMs) in three topologies. The analytical model of efficiency shows the impact of the converters' particular parameters on their properties and gives indications for an adequate design. The impact of the parameters of the semiconductor devices, parasitic resistances, switched capacitance value, number of switching cells, switching frequency, and choke design on the converters' efficiency is demonstrated. The converters are investigated analytically with the use of computer-based simulations and experimentally as a three-cell MOSFET-based SCVM dc-dc resonant boost converter. The in-depth analysis and the results obtained are some novel contributions to the existing knowledge of switched-capacitor-based power electronic conversion. Moreover, the presented method of analysis can be useful for analyzing other types of SC power converters comprising resonant switching circuits.

ACS Style

Zbigniew Waradzyn; Robert Stala; Andrzej Mondzik; Adam Penczek; Aleksander Skala; Stanislaw Pirog. Efficiency Analysis of MOSFET-Based Air-Choke Resonant DC–DC Step-Up Switched-Capacitor Voltage Multipliers. IEEE Transactions on Industrial Electronics 2017, 64, 8728 -8738.

AMA Style

Zbigniew Waradzyn, Robert Stala, Andrzej Mondzik, Adam Penczek, Aleksander Skala, Stanislaw Pirog. Efficiency Analysis of MOSFET-Based Air-Choke Resonant DC–DC Step-Up Switched-Capacitor Voltage Multipliers. IEEE Transactions on Industrial Electronics. 2017; 64 (11):8728-8738.

Chicago/Turabian Style

Zbigniew Waradzyn; Robert Stala; Andrzej Mondzik; Adam Penczek; Aleksander Skala; Stanislaw Pirog. 2017. "Efficiency Analysis of MOSFET-Based Air-Choke Resonant DC–DC Step-Up Switched-Capacitor Voltage Multipliers." IEEE Transactions on Industrial Electronics 64, no. 11: 8728-8738.

Conference paper
Published: 24 October 2016 in 2016 Second International Conference on Event-based Control, Communication, and Signal Processing (EBCCSP)
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The paper is a presentation of the model half-bridge voltage-source inverter with flexible follow-up control system and a concept of method for its controlling. It is also an attempt on discussion about the possibility of construction and implementation of flexible, compact and modular inverters as a part of modern power systems in various technological devices and processes. Based on the example of the constructed model of an inverter and obtained results of the measurements, an effort has been made to assess its performance and efficiency. The paper contains also a brief analysis of work and basic relationships in the inverter, the concept of control, conceptual design and discussion on difficulties encountered during its implementation.

ACS Style

Aleksander Skala; Zbigniew Waradzyn. Half-bridge voltage inverter with flexible follow-up control system. 2016 Second International Conference on Event-based Control, Communication, and Signal Processing (EBCCSP) 2016, 1 -8.

AMA Style

Aleksander Skala, Zbigniew Waradzyn. Half-bridge voltage inverter with flexible follow-up control system. 2016 Second International Conference on Event-based Control, Communication, and Signal Processing (EBCCSP). 2016; ():1-8.

Chicago/Turabian Style

Aleksander Skala; Zbigniew Waradzyn. 2016. "Half-bridge voltage inverter with flexible follow-up control system." 2016 Second International Conference on Event-based Control, Communication, and Signal Processing (EBCCSP) , no. : 1-8.

Book chapter
Published: 01 October 2016 in Developments in Advanced Control and Intelligent Automation for Complex Systems
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This chapter presents issues of optimization of the resonant circuit components’ volume in a switched-capacitor voltage multiplier (SCVM). The SCVM is derived from chip-scale technology but can effectively operate as a power electronic converter in a zero current switching mode when the recharging of switched capacitors occurs in a resonant circuit supported by an inductance. Selection of the passive LC components is not strictly determined, and depends on the optimization strategy according to the volume, efficiency or cost of the converter. Optimization of the volume of LC components is limited by the energy transfer ability via switched capacitors, thus by the rated power of the converter and switching frequency. Depending on the LC values, the converter operates in some specific states that determine the efficiency of the converter and voltage stress on semiconductor switches and diodes. This chapter presents analysis of the converter parameters and operation in the cases of optimization of the resonant circuit components’ values. The analytical discussion is also supported by the simulation and experimental results. All the results are provided for the SCVM but can be useful for a variety of switched-capacitor resonant power converters.

ACS Style

Zbigniew Waradzyn; Robert Stala; Andrzej Mondzik; Stanislaw Pirog. Switched Capacitor-Based Power Electronic Converter—Optimization of High Frequency Resonant Circuit Components. Developments in Advanced Control and Intelligent Automation for Complex Systems 2016, 361 -378.

AMA Style

Zbigniew Waradzyn, Robert Stala, Andrzej Mondzik, Stanislaw Pirog. Switched Capacitor-Based Power Electronic Converter—Optimization of High Frequency Resonant Circuit Components. Developments in Advanced Control and Intelligent Automation for Complex Systems. 2016; ():361-378.

Chicago/Turabian Style

Zbigniew Waradzyn; Robert Stala; Andrzej Mondzik; Stanislaw Pirog. 2016. "Switched Capacitor-Based Power Electronic Converter—Optimization of High Frequency Resonant Circuit Components." Developments in Advanced Control and Intelligent Automation for Complex Systems , no. : 361-378.

Journal article
Published: 05 March 2016 in PRZEGLĄD ELEKTROTECHNICZNY
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ACS Style

Zbigniew Waradzyn. Fixed-frequency control strategies for a series resonant inverter for induction heating - comparison of properties. PRZEGLĄD ELEKTROTECHNICZNY 2016, 1, 116 -119.

AMA Style

Zbigniew Waradzyn. Fixed-frequency control strategies for a series resonant inverter for induction heating - comparison of properties. PRZEGLĄD ELEKTROTECHNICZNY. 2016; 1 (3):116-119.

Chicago/Turabian Style

Zbigniew Waradzyn. 2016. "Fixed-frequency control strategies for a series resonant inverter for induction heating - comparison of properties." PRZEGLĄD ELEKTROTECHNICZNY 1, no. 3: 116-119.