Aaltodoc Repository :: Browsing by Author "Tarzamni, Hadi"

Browsing by Author "Tarzamni, Hadi"

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Comprehensive Reliability Assessment of Buck Quasi-Resonant Converter
(2022) Hasanisadi, Mohammadhesam; Tarzamni, Hadi; Tahami, Farzad; Department of Electrical Engineering and Automation; Industrial and Power Electronics; Sharif University of Technology
This paper explores reliability assessment of various Quasi-Resonant (QR) buck DC-DC converters including zero current/voltage switching and half-wave/full-wave topologies. The impacts of output power, input voltage, output voltage, and time duration on the failure rate of each component are investigated, then overall reliability performance of each converter is evaluated. A detailed comparison is performed in which reliability metric of buck soft switching topologies is compared with each other as well as their parent hard switching topology. Eventually, mean time to failure of the converters is analyzed. This approach provides insightful information for selecting the topology or components for the purpose of designing QR converters. To achieve the reliability of these converters, first, the required equations to evaluate the effective factors on the reliability are obtained. Then reliability metric values are calculated for three cases in each of which a key parameter of the converters varies over a specified range.
A Comprehensive Review on Flywheel Energy Storage Systems: Survey on Electrical Machines, Power Electronics Converters, and Control Systems
(IEEE, 2023-08-02) Takarli, Reza; Amini, Ali; Khajueezadeh, Mohammadsadegh; Zarbil, Mohammad Shadnam; Vahedi, Abolfazl; Kiyoumarsi, Arash; Tarzamni, Hadi; Kyyra, Jorma; Department of Electrical Engineering and Automation; Industrial and Power Electronics; Iran University of Science and Technology; University of Isfahan
Finding efficient and satisfactory energy storage systems (ESSs) is one of the main concerns in the industry. Flywheel energy storage system (FESS) is one of the most satisfactory energy storage which has lots of advantages such as high efficiency, long lifetime, scalability, high power density, fast dynamic, deep charging, and discharging capability. The above features are necessary for electric vehicles (EVs), railways, renewable energy systems, and microgrids. Also, electrical machines, power electronics converters, and control systems are the cores of energy transfer in FESS. Therefore, they have a critical role in determining efficiency, power rating, power factor, cost, angular velocity, and volume of FESS. So, in this study, the FESS configuration, including the flywheel (rotor), electrical machine, power electronics converter, control system, and bearing are reviewed, individually and comprehensively. Additionally, the mentioned components have been categorized to be a guide for future research. The investigated electrical machines are compared by Finite Element Analysis (FEA). Subsequently, our laboratory's measurement results are reviewed experimentally showing the progress in the field of FESS, such as designing robust control algorithms and an Interior Permanent Magnet-Synchronous Reluctance Machine (IPM-SynRM) to use in FESS.
Fault Management Techniques to Enhance the Reliability of Power Electronic Converters: An Overview
(IEEE, 2023-02-06) Rahimpour, Saeed; Husev, Oleksandr; Vinnikov, Dmitri; Kurdkandi, Naser Vosoughi; Tarzamni, Hadi; Department of Electrical Engineering and Automation; Industrial and Power Electronics; Tallinn University of Technology; San Diego State University
The reliability of power electronic converters is a major concern in industrial applications because of using prone-to-failure elements such as high-power semiconductor devices and electronic capacitors. Hence, designing fault-tolerant inverters has been of great interest among researchers in both academia and industry over the last decade. Among the three stages of fault management, compensating the fault is the most important and challenging part. The techniques for fault compensation can be classified into three groups: hardware redundancy methods which use extra switches, legs, or modules to replace the faulty parts directly or indirectly, switching states redundancy methods which are about omitting and replacing the impossible switching states, and unbalance compensation including the techniques to compensate for the unbalances in the system caused by a fault. In this paper, an overview of fault-tolerant inverters is presented. A classification of fault-tolerant inverters is demonstrated and major cases in each of its categories are explained.
High Step-up Common Grounded Switched Quasi Z-Source DC-DC Converter Using Coupled Inductor with Small Signal Analysis
(IEEE, 2023) Samadian, Ataollah; Marangalu, Milad Ghavipanjeh; Tarzamni, Hadi; Hosseini, Seyed Hossein; Sabahi, Mehran; Mehrizi-Sani, Ali; Department of Electrical Engineering and Automation; Industrial and Power Electronics; University of Tabriz; Virginia Polytechnic Institute and State University
In this article, a new common grounded switched quasi Z-source DC-DC converter is proposed. In the proposed converter, an additional switch and a diode are used compared to the conventional quasi Z-source converter. The proposed converter provides some benefits by using a coupled inductor and switched capacitor unit. These features are providing voltage-boosting capability using a small range of duty cycles, low voltage stress on semiconductors (switches and diodes), and continuous input current waveform. In this topology, the null of the load is connected to the negative terminal of the input DC source, directly. So, the common mode voltage is kept constant. In this case, the proposed DC-DC converter is suitable for photovoltaic (PV) power generation systems to boost the voltage of PV panels. In this paper, the proposed converter and operation modes are described completely. Also, in order to show the advantages and differences of the proposed topology with other DC-DC high-step up converters, a comparative comparison study is considered. Also, the small signal analysis and control strategy of the proposed converter are provided. In addition, design considerations of the used components are given. Then, the power loss analysis of the converter is provided. Finally, in order to prove the accurate performance of the suggested topology and verify the advantages and analysis, an experimental prototype is built at 250 W output power and the related results are provided.
Improved Resonant Converter for Dynamic Wireless Power Transfer Employing a Floating-Frequency Switching Algorithm and an Optimized Coil Shape
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2022) Ghohfarokhi, Shahriar Sarmast; Tarzamni, Hadi; Tahami, Farzad; Kyyra, Jorma; Sharif University of Technology; Department of Electrical Engineering and Automation
This paper offers a new EF-class converter for dynamic wireless power transfer application. The proposed high-frequency converter employs a floating-frequency switching algorithm to control the converter in a continuous frequency range, eliminate the requirement to any additional operational data from the secondary (receiver) side, accelerate the load impedance match while moving, maximize the transferred power rate, reduce charging interval and compensate power transfer tolerances. Moreover, an optimized super elliptical shape coil is designed to cope with lateral misalignment, enhance coil coupling, and increase efficiency. In the proposed converter, (i) soft switching is implemented to increase switching frequency, decrease passive components size, and improve power density, (ii) undesired voltage harmonics are attenuated to reduce peak voltage stress of the power switch in a wide frequency range, (iii) the receiver side is enabled for higher mobility with stable power transfer, and (iv) the resonant frequency is updated to compensate non-accurate values of passive components in experimental prototyping. In this study, the operational analytics, compensation method, control algorithm, coil design and converter optimization are followed with some comparisons to present the converter capabilities. In addition, simulation and experimental results are provided under different degrees of misalignment to verify the accuracy of theoretical analytics.
A Modified Switched-Capacitor Based Seventeen-Level Inverter With Reduced Capacitor Charging Spike for RES Applications
(IEEE, 2023-08-07) Marangalu, Milad Ghavipanjeh; Kurdkandi, Naser Vosoughi; Hosseini, Seyed Hossein; Tarzamni, Hadi; Dahidah, Mohamed; Sarhangzadeh, Mitra; Department of Electrical Engineering and Automation; Industrial and Power Electronics; University of Tabriz; San Diego State University; Newcastle University; Islamic Azad University
This paper presents a grid-connected system for renewable energy source (RES) applications. The proposed system consists of a modified switched-capacitor (SC) based multilevel inverter and a DC-DC flyback converter. By using the DC-DC flyback converter the voltages of DC-link capacitors are adjusted to the same values. This modified SC-based multilevel inverter has benefits like limited capacitor charging spike, reasonable size, power density, cost per output power, active and reactive power support, adjusted injected current to the grid, and reduced number of input power DC supplies. Two isolated DC sources are generated using a flyback converter to supply the SC-based inverter and increase the number of voltage levels produced at the output. In this topology, one of the most important problems of the switched capacitor, i.e., the occurrence of the inrush currents during charging capacitors, is solved by using a circuit unit that consists of an inductor with a parallel power diode in the capacitive charging current path. To confirm the performance of the presented structure, comprehensive experiments and comparisons are provided. In the experiments, the peak current control (PCC) method is applied to control both the active and reactive power injected into the grid by the modified 17-levels grid-connected inverter.
A New Single DC Source Five-Level Boost Inverter Applicable to Grid-Tied Systems
(IEEE, 2023) Marangalu, Milad Ghavipanjeh; Kurdkandi, Naser Vosoughi; Alavi, Peyman; Khadem, Saeideh; Tarzamni, Hadi; Mehrizi-Sani, Ali; Department of Electrical Engineering and Automation; Industrial and Power Electronics; University of Tabriz; San Diego State University; Pennsylvania State University; California State University, Long Beach; Virginia Polytechnic Institute and State University
In this paper, a single source five-level boost inverter has been proposed and analyzed. The proposed structure includes a five-level inverter and a single-input multi-output (SIMO) boost converter. In this structure, the DC link voltage has been controlled by controlling the implemented DC-DC boost converter. In addition, the inverter switching pattern has been obtained based on the pick current control (PCC) method. In order to test and prove the performance of the proposed structure, this system is tested with the local grid. Since the active and reactive powers have been controlled based on the PCC method, the generated energy in a renewable energy source can be transferred to the local grid with a controlled and high-quality current. In this paper, the proposed structure has been introduced and its operation in different modes has been analyzed completely. Furthermore, the design considerations of the required elements have been investigated. Also, the power loss analysis and the comparison results of the proposed converter with other similar structures have been presented. Finally, in order to test the practical performance of the proposed structure and prove the theoretical analysis, a 620 W laboratory prototype of this structure has been assembled and its performance with the local grid has been tested.
A New Six-Level Transformer-Less Grid-Connected Solar Photovoltaic Inverter with Less Leakage Current
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2022) Kurdkandi, Naser Vosoughi; Marangalu, Milad Ghavipanjeh; Mohammadsalehian, Shamim; Tarzamni, Hadi; Siwakoti, Yam; Islam, Md Rabiul; Muttaqi, Kashem M.; Department of Electrical Engineering and Automation; Industrial and Power Electronics; Tallinn University of Technology; University of Tabriz; Western University; University of Technology Sydney; University of Wollongong
This paper presents a novel structure of the transformer-less grid-connected inverters. The proposed inverter is combined with six power switches and two power diodes which can generate six voltage levels at the output. Furthermore, the proposed inverter can overcome the leakage current issue in the photovoltaic (PV) system, which is the major problem in grid-tied PV applications. Additional significant features include-reduced filter size, lower total harmonic distortion (THD) of the injected current to the grid, and voltage boosting ability. Moreover, the proposed topology provides full reactive power support to the grid. A control strategy is designed and implemented to provide a voltage boost ability without using any additional dc-dc boost converter. Finally, the performance of the proposed inverter is validated by the 770 W laboratory prototype.
Non-Isolated High Step-Up DC-DC Converters: Comparative Review and Metrics Applicability
(IEEE, 2024-01) Tarzamni, Hadi; Gohari, Homayon Soltani; Sabahi, Mehran; Kyyra, Jorma; Department of Electrical Engineering and Automation; Industrial and Power Electronics; K.N. Toosi University of Technology; University of Tabriz
Due to the extensive role of non-isolated high step-up DC-DC converters (NHSDC)s in industrial applications and academic research, many of these pulse width modulation converters have been presented in recent years. For each of these NHSDCs, some claims are introduced to verify its capabilities and features, which has been investigated in some review papers with different frameworks. Dissimilar to previous review papers, which have focused on the classification and derivation of voltage boosting techniques, this paper aims to evaluate the converters from various topological and operational points of view, and determine the superiority of each technique and converter according to applications. Some of these metrics are voltage gain, stresses, ripple, cost, power density, weight, size, control complexity and components count which lead to a comprehensive comparative study. Then, as the main purpose of this paper, effectiveness of these metrics is assessed to show how well they can lead us to the fair comparison results. Moreover, some new figures of merit are proposed in this paper to provide a helpful guideline in power electronic converters comparison studies. Finally, the feasibility discussion of single- and multi-objective figures of merit is followed by general practical conclusion and outlook about the NHSDC structures.
Non-isolated Ultra-high Voltage Gain Coupled Inductor-based DC-DC Converter
(IEEE, 2023-12) Gohari, Homayon Soltani; Mardakheh, Naghi Abbasi; Tarzamni, Hadi; Kurdkandi, Naser Vosoughi; Abbaszadeh, Karim; Kyyra, Jorma; Department of Electrical Engineering and Automation; Industrial and Power Electronics
In this paper, an improved non-isolated coupled inductor-based high step-up DC-DC converter is proposed, with ultra-high voltage gain thanks to an active switched inductor. Utilizing a three-winding coupled inductor (CI) adds two more freedom degrees arising from its turns ratios that leads to a wide output voltage range. Several capacitive and inductive power transferring methods with no circulating current are used to recycle the stored energy in passive components. Two series-connected output ports and a passive clamp make the output and switch voltage stresses more tolerable, respectively. In addition, synchronized operation of switches leads to an easily implementable control system. Operation of the proposed converter in continuous conduction mode is analyzed thoroughly along with boundary and discontinuous conduction modes. Moreover, components design guideline is provided, and to evaluate the features, the converter is compared with some recent converters. Eventually, the experimental results of a 300 W laboratory prototype are given to validate the theoretical analysis.
Operation and Design Consideration of an Ultra High Step-Up DC-DC Converter featuring High Power Density
(IEEE, 2021-10-01) Tarzamni, Hadi; Sabahi, Mehran; Rahimpour, Saeed; Lehtonen, Matti; Dehghanian, Payman; Department of Electrical Engineering and Automation; Power Systems and High Voltage Engineering; University of Tabriz; Guilan University; George Washington University
A new dual-coupled inductor (CI) single-switch high step-up dc-dc topology featuring high power density is proposed in this study. Various capacitive power transfer methods, as well as inductive power transfer techniques, are utilized to act as a more efficient power interface between the input and the load. Three ports in the output terminal are employed to distribute the overall output voltage, diminish the voltage ripple in high-voltage gain ratios, and decrease the voltage stress on the port component. In the proposed converter, first, the voltage gain is high in lower duty cycles of the switching. Second, the stored energy of magnetizing and leakage inductances is recycled in both Cls. Third, the switch voltage spikes are alleviated. Fourth, the operation is done with no circulating current. Fifth, low-size passive components are presented. Sixth, high power density is obtained, and the voltage range is widened. Finally, a simple pulsewidth modulation (PWM) utilizing a wide control range is provided. In this study, the steady-state operation is analyzed under both continuous conduction mode (CCM) and discontinuous conduction mode (DCM), and the performance of the converter is evaluated using comparisons with similar works. In addition, the experimental results have been provided to justify the feasibility of the design.
An Overview of Lifetime Management of Power Electronic Converters
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2022) Rahimpour, Saeed; Tarzamni, Hadi; Kurdkandi, Naser Vosoughi; Husev, Oleksandr; Vinnikov, Dmitri; Tahami, Farzad; Department of Electrical Engineering and Automation; Industrial and Power Electronics; Tallinn University of Technology; Sharif University of Technology
An expected lifetime of converters is of great importance for optimal decision-making in the planning of modern Power Electronic (PE) systems. Hence, the lifetime management of power electronic systems has attracted a lot of attention in academia and industry. This paper is a guideline for managing the lifetime of power converters. Analyzing the different kinds of failures, failure modes and their corresponding mechanisms are investigated in the first section along with the failure data needed as input parameters of the assessment. In the second section, lifetime prediction in two aspects of component-level and system level is discussed and all the possible techniques to achieve them are investigated and compared. All the steps required to predict the lifetime in the component-level including electrothermal modeling, cycle counting, lifetime model, damage accumulation, parameter estimation, and lifetime distribution are described and then system level methods consisting of reliability block diagrams, fault-tree analysis, and Markov chains are examined and compared. The last section contains the roadmap of the lifetime extension including the reliable design and condition monitoring.
PV-Grid Integrated Multifunctional Buck-boost On-board EV Charger with CCM-DCM Operation
(2023-10-19) Gohari, Homayoun Soltani; Tarzamni, Hadi; Sergeant, Peter; Vansompel, Hendrik; Department of Electrical Engineering and Automation; Industrial and Power Electronics; Ghent University
This paper delves into the development of on-board EV chargers with the purpose of using the energy of the vehicle-roof photovoltaic panels and merging charging and driving modes power converters. In pursuit of this objective, a novel high step-up coupled inductor-based DC-DC converter is proposed, which enables the proposed charger to use the PV panel energy in an efficient way. From utility grid point of view, a bridgeless AC-DC converter is considered that is able to operate in continuous and discontinuous conduction modes (CCM and DCM), providing the chance to achieve natural power factor correction in DCM operation in addition to control the power factor in CCM operation. The sources participate in charging process via the proposed dual-input single-output SEPIC based DC-DC converter. In addition to the charging mode, in which the battery is charged using grid and/or PV panel, the proposed charger can deliver energy from the battery and PV panel to the motor drive system during driving mode. It should be noted that the buck-boost structure of the proposed converter enables the control system to manage the power sources and load efficiently according to their characteristics. All stages of the proposed multifunctional multiport on-board charger are analyzed thoroughly and simulation results are given to validate the analysis.
Reliability Analysis on Winding Configurations of Variable Reluctance Resolver Under Faulty Conditions
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2022) Emadaleslami, Mahdi; Khajueezadeh, Mohammadsadegh; Zarei, Mohammadebrahim; Haghifam, Mahmoudreza; Tarzamni, Hadi; Department of Electrical Engineering and Automation; Industrial and Power Electronics; Tarbiat Modares University; Sharif University of Technology
Owing to the use of the Permanent Magnet Synchronous Motor (PMSM) widely in Electrical Vehicles (EVs), the mandatory existence of rotor angle sensor in its control algorithm, higher reliability of the resolver than the other instance, and eventually, the significant effect of resolver errors on the system stability, comparing the reliability of two winding configurations in resolver is regarded analytically and numerically in the following study. Firstly, the employed assessment model is defined. Subsequently, it is necessary to investigate the failure modes in the resolver thoroughly. Among the methods used to assess reliability, the Markov model is chosen for the reliability analysis. Finally, by using an experimentally verified Finite Element (FE) resolver model, the faulty conditions in the Variable Turn Overlapping Winding (VTOW) and Constant Turn Non-Overlapping Winding (CTNOW) configurations of the Variable Reluctance (VR) resolver are investigated. The accuracy degradation of the resolver under faulty conditions is used as the reliability criteria to define the reliability state of the resolver.
Reliability Assessment of Conventional Isolated PWM DC-DC Converters
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2021-03-22) Tarzamni, Hadi; Esmaeelnia, Farhad Panahandeh; Tahami, Farzad; Fotuhi-Firuzabad, Mahmud; Dehghanian, Payman; Lehtonen, Matti; Blaabjerg, Frede; Department of Electrical Engineering and Automation; Power Systems and High Voltage Engineering; University of Tabriz; Sharif University of Technology; George Washington University; Aalborg University
This paper sets forth the reliability analysis of conventional isolated pulse width modulation DC-DC (IDC-DC) converters. The IDC-DC converters are categorized into isolated single-switch DC-DC (ISSDC-DC) or multiple-switch DC-DC (IMSDC-DC) converters. The proposed framework encompasses analyzing the impacts of duty cycle, input voltage, output power, transformer turns ratio, components characteristics and time duration on the overall reliability performance of the IDC-DC converters. The suggested reliability assessment is centered on Markov models characterized by taking into consideration all open and short circuit faults on the components in both continuous and discontinuous conduction modes. We further investigate the self-embedded fault tolerant capability of the IMSDC-DC converters under open circuit fault scenarios on the switches, diodes and blocking capacitors, where we offer new reliability analytics. Along with extensive analyses and comparisons, several experimental results are provided to verify the self-embedded fault tolerant capability of IMSDC-DC converters.
A Seventeen-Level Step-up Switched-Capacitor Based Multilevel Inverter with Reduced Charging Current Stress on Capacitors for PV Applications
(IEEE, 2023) Haghighian, Saiedeh Khadem; Yeh, Hen Geul; Marangalu, Milad Ghavipanjeh; Kurdkandi, Naser Vosoughi; Abbasi, Maysam; Tarzamni, Hadi; Department of Electrical Engineering and Automation; Industrial and Power Electronics; University of California; University of Tabriz; San Diego State University; University of Technology Sydney
Because of serious challenges such as air pollution, global warming, and fossil fuels limitations, renewable energy sources such as photovoltaic (PV) systems are increasingly being integrated into the power systems around the world. In this article, a new grid-tied system is proposed for PV applications which consists of an improved flyback DC-DC converter and a new switched-capacitor (SC) based multilevel inverter. Over previously introduced topologies in the same class, the proposed SC-based multilevel inverter has many advantages like reduced number of power switches and DC voltage sources, and also increased number of voltage levels produced at the output. In the proposed structure, one of the most important problems of the capacitive switching inverters, i.e. the occurrence of the impact currents during charging capacitors, is solved by using an inductor with a parallel diode in the capacitive charging current path. This increases the efficiency of the converter and reduces the charging current stress on the capacitors. To validate the performance of the proposed topology, comprehensive experiments and comparisons have been performed and presented. In the experiments, a current controller is used to control the amount of active and reactive power injected to the grid by the proposed grid-tied 17-levels inverter.
Single-Input Quadruple-Boosting Switched-Capacitor Nine-Level Inverter with Self-Balanced Capacitors
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2022) Varesi, Kazem; Esmaeili, Fatemeh; Deliri, Saeid; Tarzamni, Hadi; Department of Electrical Engineering and Automation; Industrial and Power Electronics; Sahand University of Technology
This paper suggests a single-input switched-capacitor Nine-level inverter configuration advantaging from quadruple voltage-boosting ability, natural voltage balancing of capacitors, and reduced components per level. Also, the single-source character of the proposed topology makes it cheaper and more compact. The cascaded version of the suggested topology has also been introduced, by which high boosting factors, as well as large number of steps, can be obtained. The proposed topology can effectively supply the resistive-inductive or pure inductive load types. The capacitors' impulsive-charging-current issue has been solved by simple small-inductance-based inductor-diode (L-D) networks. The comparative analysis affirms the fewer device-usage in suggested configuration per equal gain or level count than existed structures, resulting in less size and cost. The usage of Nearest-Level modulation guarantees the low-frequency operation of semiconductors and reduces the switching losses. The comparative analysis and experimental outcomes affirm the competitiveness and accurate functionality of suggested configuration.
Thermal analysis of non-isolated conventional PWM-based DC-DC converters with reliability consideration
(Institution of Engineering and Technology, 2021-02) Tarzamni, Hadi; Esmaeelnia, Farhad Panahandeh; Tahami, Farzad; Fotuhi-Firuzabad, Mahmud; Tohidi, Sajjad; Dehghanian, Payman; Lehtonen, Matti; Department of Electrical Engineering and Automation; Power Systems and High Voltage Engineering; University of Tabriz; Sharif University of Technology; George Washington University
This paper proposes analytics for reliability assessment of non-isolated conventional pulse width modulation DC-DC (NIDC-DC) converters. This class of converters consists of conventional Buck, Boost, Buck-Boost, Cuk, Sepic and Zeta topologies. The proposed analytics are founded based on the Markov process principles and can effectively capture the effects of duty cycle, input voltage, output power, voltage gain, components characteristics and aging on the overall reliability performance and mean time to failure of the NIDC-DC converters. Furthermore, the suggested framework takes both continuous and discontinuous conduction modes of each converter into account, with which the open and short circuit faults in the components are analysed. As an important outcome, the most reliable operation region of the NIDC-DC converters are obtained with respect to different operational parameters, which is useful in design procedure. Eventually, extensive thermal experiments with an appropriate reflection of reliability metric are conducted to measure the components' temperatures and verify their performance in different operating conditions.
Ultra-High Step-Up DC-DC Converters Based on Center-Tapped Inductors
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2021-10-04) Tarzamni, Hadi; Kurdkandi, Naser Vosoughi; Gohari, Homayon Soltani; Lehtonen, Matti; Husev, Oleksandr; Blaabjerg, Frede; Department of Electrical Engineering and Automation; Industrial and Power Electronics; Power Systems and High Voltage Engineering; Tallinn University of Technology; K.N. Toosi University of Technology; Aalborg University
In this paper, a new family of ultra-high step-up DC-DC converters based on a center-tapped coupled inductor (CI) is proposed. These single-switch converters employ different inductive and capacitive power transfer techniques by utilizing multi-winding CIs, intermediate capacitor links and simple switched-capacitors to improve the transferred power rate, harvest magnetizing and leakage inductance energies, and enhance power density. Achieving high voltage gain in low duty cycle values enables the proposed converters to operate under wide output voltage ranges; meanwhile, distributing the output voltage on two or three output ports alleviates the voltage stress on output terminal components. Low input current ripple, simple pulse width modulation control, low switch voltage stress and operation without circulating current can be listed as other features. In this paper, the proposed family is introduced, theoretically analyzed and compared with other state-of-the-art researches. Finally, the accuracy of analyses are evaluated with some experimental tests of a 1.25 kW experimental prototype.

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