Emmanuel C. Tatakis

University of Patras

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Nick Papanikolaou

Champalimaud Foundation

Georgios C. Christidis

University of Patras

Georgios S. Dimitrakakis

University of Patras

Stylianos P. Syrigos

University of Patras

Anastasios Ch. Nanakos

University of Patras

Anastasios Kyritsis

Ionian University

Theodoros P. Mouselinos

University of Patras

Charoula G. Zogogianni

University of Patras

Alex V. Mirtchev

University of Patras

N.P. Polyzos

University of Patras

Cooperative Institutions

University of Patras

National Technical University of Athens

National and Kapodistrian University of Athens

Technological Educational Institute of Central Greece

Democritus University of Thrace

Université Libre de Bruxelles

Institute of Electrical and Electronics Engineers

Hellenic Naval Academy

Technical University of Crete

Philips (Belgium)

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Comparative study of the dc/dc boost converter with SiC and Si power devices

Electrical Systems for Aircraft, Railway and Ship Propulsion (2012)

Apollo Charalambous Georgios C. Christidis Emmanuel C. Tatakis

In this paper, the design and implementation of a 500W dc/dc boost converter using a SiC VJFET and a SiC Schottky Barrier Diode (SBD) is investigated. Firstly, the converter is designed for stepping up a voltage of 48 V to 100 V. It is compared with an identical, more conventional boost converter that employs a Si MOSFET and a Si pn diode. An efficiency of 95.12% has been achieved by the SiC boost converter under nominal conditions. Secondly, the duty cycle is cranked up, as to investigate the maximum voltage step-up that can be attained by the implemented converter. A record-high voltage conversion ratio of 7.65 has been demonstrated, bringing the input of 48 V to 367.4 V, under a duty cycle of 0.88 and an efficiency of 90.91%. The great efficiency and voltage step-up allow for this simple boost converter, to be an affordable and appealing solution for every application where a voltage step-up is required, since it can save up energy, space and weight.

Duty cycle

10.1109/esars.2012.6387422

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Citations (3)

Hybrid Discontinuous/Boundary Conduction Mode of Flyback Microinverter for AC–PV Modules

IEEE Transactions on Power Electronics (2015)

Georgios C. Christidis Anastasios Ch. Nanakos Emmanuel C. Tatakis

The current-source flyback inverter has been proven an excellent solution for ac-PV modules. The two principal modes of operation of this converter are the discontinuous conduction mode (DCM) and the boundary conduction mode (BCM). Although BCM offers higher power density, it suffers at lower power levels, because of the significantly increased switching frequency that consequently leads to higher switching losses and lower overall converter efficiency. In this paper, a hybrid operating mode is presented, that combines both DCM and BCM during a utility grid period, so as to improve the converter performance as well as the efficiency and the power density on a wider power range. The mathematical analysis that describes the control specifics especially for a smooth transition between the two modes of operation is presented and demonstrated through computer simulations and experimental results on a laboratory prototype.

Solar micro-inverter

Power density

Mode (computer interface)

10.1109/tpel.2015.2470094

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Citations (59)

Power factor correction in AC/DC converters: design and measuring problems

Nick Papanikolaou N.P. Polyzos Emmanuel C. Tatakis

This paper presents the design and the real characteristics of a power factor correction (PFC) boost converter, operating at a power level of 1000 W and at a variable switching frequency (between 7 kHz and 100 kHz). The harmonic content of the input current of a PFC boost converter is monitorized and compared with the harmonic content of the input current of the traditional AC/DC conversion topology. Another issue that is discussed in this paper is the accuracy of different measuring instruments in function to the harmonic content of the measuring signal and the interference in the operational characteristics of this converter due to the presence of these instruments. Experimental results for the case of a traditional AC/DC converter as well as for the case of a PFC converter are exhibited.

Harmonic

Harmonic Analysis

10.1109/ichqp.1998.759890

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Citations (2)

An Improved Boost-Based dc/dc Converter With High-Voltage Step-Up Ratio for DC Microgrids

IEEE Journal of Emerging and Selected Topics in Power Electronics (2020)

Konstantinos Zaoskoufis Emmanuel C. Tatakis

In this article, an improved ripple-free input current boost-based high step-up (HSU) dc/dc converter compared to the coupled inductor (CI) ones is proposed, where the large CI is replaced by an inductor and a built-in transformer. By doing so, the energy is transferred to the output by two smaller magnetic components. Hence, a more compact and more efficient coupled magnetic component with greater flexibility in increasing its turns ratio is succeeded, allowing us to achieve higher dc voltage gains (higher than 20). Additionally, an active clamp is employed to recycle the leakage energy of the transformer, eliminating at the same time the switching losses. Therefore, by increasing the switching frequency it is feasible to build a highly efficient, reduced-size HSU converter that can be integrated along with a low maximum power point voltage photovoltaic module for dc microgrid applications. Finally, a 250-W-rated prototype has been implemented to verify the functionality of the presented converter in continuous conduction mode operation with an input voltage range of 16-20 V and an output voltage of 400 V.

10.1109/jestpe.2020.2981018

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Citations (43)

Optimum design of a flyback PV microinverter under hybrid DCM/BCM operation

Georgios C. Christidis Anastasios Ch. Nanakos Emmanuel C. Tatakis

The Current-Source Flyback microinverter is widely used in ac-PV module applications, either in Discontinuous Conduction Mode (DCM), Continuous Conduction Mode (CCM) or Boundary Conduction Mode (BCM). The recently proposed hybrid DCM/BCM operation inherits the merits of both discrete conduction modes and improves the converter performance. In this work a power loss analysis of the hybrid operation is conducted for each converter component and a design optimization algorithm is applied, focusing on the appropriate selection of each converter component and parameter, in order to achieve maximum weighted efficiency. The mathematical analysis is validated using a laboratory experimental prototype.

Solar micro-inverter

Component (thermodynamics)

Mode (computer interface)

10.1109/epe.2016.7695626

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Citations (1)

Design Methodology Based on Dual Control of a Resonant Dual Active Bridge Converter for Electric Vehicle Battery Charging

IEEE Transactions on Vehicular Technology (2022)

Alex V. Mirtchev Emmanuel C. Tatakis

In this paper, a detailed design methodology of a Resonant Dual Active Bridge (R-DAB) converter is proposed for battery charging applications. The converter design methodology is tailored to the charging profile of a Li-ion battery and is based on unique operating points (UOPs) that derive from a dual control method analysis. Specifically, both Pulse Frequency Modulation (PFM) and Phase-Shift Modulation (PSM) are adopted, to minimize the switching losses and the reactive power at the resonant tank. A detailed flowchart is presented, considering multiple design parameters and the UOPs, so that the resonant tank parameters are not overestimated. Simulation results of a conventional charger are presented, that validate the control method and design procedure. Finally, a 1kW|30A laboratory prototype charger is designed and evaluated, using a closed loop control system. The analysis of the experimental results proves the significance of the dual control method and verifies the proposed design methodology.

Flow chart

Battery charger

Dual loop

Modulation (music)

10.1109/tvt.2022.3142681

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Citations (19)

Novel technique for power factor correction in flyback converters

IEE Proceedings - Electric Power Applications (2001)

Nick Papanikolaou Evangelos Rikos Emmanuel C. Tatakis

Due to the necessity of DC power supplies that combine variable step-up and step-down DC output voltage, high power density and low harmonic distortion at the mains side, power factor correction in flyback converters has become a great issue. The paper presents a novel method to achieve high power factor correction in flyback converters without sensing the input current. This method is extended to give to a simplified and accurate design strategy for this type of converter, revealing an optimal solution under any operating point.

Flyback diode

10.1049/ip-epa:20010262

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Citations (14)

Behavioral analysis of a single-switch step up converter

European Conference on Power Electronics and Applications (2011)

Emmanuel C. Tatakis Μαργαρίτα Καλογεροπούλου Georgios C. Christidis

This paper presents a detailed analysis of the behavior of a DC-DC boost-flyback converter which is a single-switch step up converter with a high voltage gain. The behavioral investigation of this converter is carried out supposing it consists of two converters, a boost and a flyback connected in series. The interesting characteristic of this boost-flyback converter is its modes of operation (continuous, discontinuous and mixed), which are depicted analytically. There are two different ways of operation: one in which the boost converter goes over first from the continuous conduction mode (CCM) to the discontinuous conduction mode (DCM) and another one in which the flyback goes over first from CCM to DCM. Each way of operation depends on the duty cycle δ and the ratio k L of both boost's and flyback's magnetic components' inductances. In this paper, all four different modes of operation are investigated and the output voltage characteristic curves are described as well. Finally, simulation and experimental results are compared to those from theory for different values of the duty cycle δ and the load to validate the theoretical analysis.

Duty cycle

Flyback diode

Buck converter

Source

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Citations (1)

Sensitivity Analysis of a Non-Symmetrical Resonant Converter with Frequency and Phase-Shift Closed Loop Control for Battery Charging

Alex V. Mirtchev Emmanuel C. Tatakis

In this paper, a sensitivity analysis of a non-symmetrical resonant converter for battery charging is presented. The effects of the resonant tank parameters on the output power and the control variables is examined through sensitivity analysis. Pulse frequency modulation (PFM) and phase-shift modulation (PSM) techniques are implemented to control the converter output. A sensitivity analysis is conducted for the whole frequency spectrum and different operation conditions. The sensitivity coefficients of the output power and the control variables are calculated with respect to crucial parameters of the resonant tank. An experimental prototype is implemented to verify the sensitivity analysis and the control method.

Modulation (music)

Pulse-frequency modulation

10.23919/epe21ecceeurope50061.2021.9570430

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Citations (0)

A new stator resistance tuning method for stator-flux-oriented vector-controlled induction motor drive

IEEE Transactions on Industrial Electronics (2001)

Epaminondas D. Mitronikas A. Safacas Emmanuel C. Tatakis

Field-oriented-controlled induction motor drives have been widely used over the last several years. Conventional direct stator-flux-oriented control schemes have the disadvantage of poor performance in the low-speed operating area when the stator flux is calculated using the voltage model, due to the stator resistance uncertainties and variations. In this paper, a new closed-loop stator-flux estimation method for a stator-flux-oriented vector-controlled induction motor drive is presented in which the stator resistance value is updated during operation. This method is based on a simple algorithm capable of running in a low-cost microcontroller, which is derived from the dynamic model of the induction machine. The effects of stator resistance detuning, especially in the low-speed operating region, are investigated and simulation results are shown. The motor drive system as well as the control logic and the resistance estimator are simulated and characteristic simulation results are derived. In addition, the proposed control scheme is experimentally implemented and some characteristic experimental results are shown. The simulation as well as the experimental results reveal that the proposed method is able to obtain precise flux and torque control, even for very low operating frequencies.

10.1109/41.969393

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Citations (83)