Mehmet Timur Aydemir

Aydemir, Mehmet Timur

Name Variants

A.,Mehmet Timur
A., Mehmet Timur
Aydemir, Mehmet Timur
AYDEMIR, MEHMET TIMUR
Aydemir M.
MEHMET TIMUR AYDEMIR
AYDEMIR, Mehmet Timur
Mehmet Timur AYDEMIR
M. Aydemir
Mehmet Timur, Aydemir
Aydemir,Mehmet Timur
Aydemir,M.T.
Aydemir, M. T.
M. T. Aydemir
Mehmet Timur Aydemir
Aydemir, M.
Aydemir, MEHMET TIMUR
Aydemir T.

Job Title

Prof. Dr.

Email Address

timur.aydemir@khas.edu.tr

ORCID ID

0000-0001-9405-6854

Scopus Author ID

56373635300

Full item page

Scholarly Output

8

Articles

4

Citation Count

56

Supervised Theses

0 Scholarly Output Search Results

Now showing 1 - 7 of 7

Citation Count: 24
Inductive Power Transfer for Electric Vehicle Charging Applications: A Comprehensive Review
(Mdpi, 2022) Aydemir, Mehmet Timur; Aydemir, Mehmet Timur; Aksoz, Ahmet; El Baghdadi, Mohamed; Hegazy, Omar
Nowadays, Wireless Power Transfer (WPT) technology is receiving more attention in the automotive sector, introducing a safe, flexible and promising alternative to the standard battery chargers. Considering these advantages, charging electric vehicle (EV) batteries using the WPT method can be an important alternative to plug-in charging systems. This paper focuses on the Inductive Power Transfer (IPT) method, which is based on the magnetic coupling of coils exchanging power from a stationary primary unit to a secondary system onboard the EV. A comprehensive review has been performed on the history of the evolution, working principles and phenomena, design considerations, control methods and health issues of IPT systems, especially those based on EV charging. In particular, the coil design, operating frequency selection, efficiency values and the preferred compensation topologies in the literature have been discussed. The published guidelines and reports that have studied the effects of WPT systems on human health are also given. In addition, suggested methods in the literature for protection from exposure are discussed. The control section gives the common charging control techniques and focuses on the constant current-constant voltage (CC-CV) approach, which is usually used for EV battery chargers.
Citation Count: 0
Parallel-Input Series-Output Z-Source Converters for High Voltage DC Power Supplies
(Institute of Electrical and Electronics Engineers Inc., 2023) Aydemir, Mehmet Timur; Aydin,E.; Dag,B.; Tamyurek,B.; Aydemir,M.T.
High Voltage DC power supplies typically employ a high voltage high frequency transformer to step-up the voltage generated by a high frequency inverter. Generally, the step-up ratio of the transformers is high and therefore the effect of the stray capacitance and inductance values is amplified, deteriorating the inverter operation. LCC converters utilizing these stray capacitors are suggested to generate soft switching for better efficiency, but this increases the complexity. Also, the varying nature of the stray capacitance may complicate the control. In this paper, a modular, Parallel-Input Series-Output converter utilizing two z-source dc-dc converters is proposed to step a 350V input to generate 2-kV, 2-kW output. Simulation and experimental results prove that impedance source converters which are generally used in renewable energy applications can also be used at high voltage applications. © 2023 IEEE.
Citation Count: 0
Investigation of External Factors for Wireless Capacitive Power Transfer Systems
(Univ Osijek, Tech Fac, 2023) Aydemir, Mehmet Timur; Bayindir, Kamil Cagatay; Aydemir, Mehmet Timur
Capacitive power transfer (CPT) technology has gained more and more importance in recent years. This paper investigates the effects of temperature and relative humidity on CPT system performance. The conventional four-plate horizontal and vertical coupler structures are built to observe the variations of coupling capacitances under external factors. The pressure of the coupler ambient is kept constant, and the effects of temperature and relative humidity are reviewed separately. The different temperature (25 - 105 & DEG;C) and relative humidity (43 - 80% RH) levels are reviewed in these scenarios. The obtained results indicate that the values of coupling capacitances are inversely proportional to the temperature level, whereas the values of coupling capacitances are directly proportional to the relative humidity level. In addition, the visible changes happen in coupling capacitances after 45 & DEG;C and 55 & DEG;C for horizontally and vertically arranged four-plate coupler structures, respectively. It is also observed that relative humidity level becomes a critical point after 60% RH for both coupler structures. Among the coupling capacitances, the main capacitances are the most affected during the variations for both couplers. This study is expected to be a reference for the researchers on external factors in CPT systems.
Citation Count: 1
A Load Adaptive Cascade PI Controller for Buck Converters Operating in Wide Load Range in Cathodic Protection Systems
(IEEE, 2021) Aydemir, Mehmet Timur; Simsek, Oguz; Aydemir, Mehmet Timur
This paper proposes a simple cascade PI controller for Buck converter to be used in impressed current cathodic protection (ICCP) systems which aim to operate in wide voltage and current ranges for any load condition. The Buck converter with cascade controller structure is a frequently used topology in ICCP systems to prevent buried steel pipelines from corrosion. Changes in the environment in which the pipe is embedded force the converter to operate at wide load and voltage ranges. However, in average current mode controllers, the gain of the current loop varies significantly with the load. At light loads, the inner current loop slows down dramatically and may stay behind the outer voltage loop. In order to solve these issues and to maintain the regulation of the pipeline voltage and the average load current, this paper presents a simple cascade PI controller whose coefficients are adapted to the changing load. The small signal analysis of the Buck converter in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) is performed and variables determining the transfer characteristics are examined. For the proposed controller, a design criteria based on circuit parameters have been established. With the parameters obtained by the proposed method, a sample cascade controller is designed and compared with classical PI controller in simulation. Also, a digitally controlled 100-W converter prototype is built to validate the performance.
Citation Count: 30
A Comprehensive Review on Wireless Capacitive Power Transfer Technology: Fundamentals and Applications
(IEEE-Inst Electrical Electronics Engineers Inc, 2022) Aydemir, Mehmet Timur; Bayindir, Kamil Cagatay; Aydemir, Mehmet Timur; Chaudhary, Sanjay K.; Guerrero, Josep M.
Capacitive power transfer (CPT) technology is becoming increasingly popular in various application areas. Due to its limitations, such as low frequency, low coupling capacitance, and the high voltage stress on metal plates, the studies on high power CPT applications fell behind previously. Therefore, the wideband gap (WBG) semiconductor devices and the compensation topologies are further adopted to tackle these limitations. The main purpose of the paper is to review CPT applications in terms of performance parameters, advantages, disadvantages, and also challenges. Initially, the basic principles of CPT technology are examined, which cover compensation topologies, coupler structures, transfer distance, power electronic components, and system control methods. Then, CPT applications are evaluated for performance parameters (i.e., power level, operation frequency, system efficiency, transfer distance) along with compensation types, inverter types, and coupler types. The applications are categorized into six main groups according to industrial topics as safety, consumer electronics, transport, electric machines, biomedical, and miscellaneous. Herein, power level changes from mu W to kW ranges, the operation frequency varies from 100s of kHz to 10s of MHz ranges as well. The maximum system efficiency is recorded as 97.1 %. The transfer distance varies from mu m range to 100s of mm ranges. The full-bridge inverter topology and four-plate coupler structure are noticeable in CPT applications. Finally, advantages, disadvantages, and challenges of CPT applications are evaluated in detail. This review is expected to serve as a reference for researchers who study on CPT systems and their applications.
Citation Count: 1
Yüksek DA Gerilim Uygulamaları için Empedans Kaynaklı Yükseltici Çevirici Tasarımı
(2023) Aydemir, Mehmet Timur; Dağ, Bülent; Özdemir, Mehmet Akif; Aydın, Emrullah; Tamyürek, Bünyamin
Bu çalışmada yüksek DA gerilimli bir güç kaynağında kullanılmak üzere yüksek kazançlı yeni nesil bir empedans kaynaklı yükseltici çeviricinin güç katı tasarımı yapılmıştır. Ele alınan empedans kaynaklı çevirici yeni geliştirilmiş bir topoloji olup, çeviricinin temel çalışma prensibi daha önceki bir çalışmada detaylı şekilde incelenmiştir. Bu çalışmada çeviricinin hedeflenen uygulamaya yönelik tasarımı için gereken gerilim-denge ve akım-denge eşitlikleri çıkarılmıştır ve bu eşitlikler kullanılarak uygun devre elemanları değerleri belirlenmiştir. Tasarlanan çeviricinin performansı Matlab-Simulink benzetim modeli ile doğrulanmıştır.
Citation Count: 0
A new capacitive coupler design for wireless capacitive power transfer applications
(Elsevier - Division Reed Elsevier India Pvt Ltd, 2023) Aydemir, Mehmet Timur; Bayindir, Kamil Cagatay; Aydemir, Mehmet Timur
Capacitive power transfer (CPT) technology has become a promising alternative solution for wireless charging applications. This paper proposes a novel coupler design to form a resonant capacitor by inserting dielectric material between two bent metal plates for each primary and secondary circuit. The main purpose of the proposed coupler is to eliminate the external capacitors and solve the low coupling capacitance for CPT applications. A comparison to the conventional four-plate coupler is presented, which shows specifically higher coupling capacitance, lower required inductance, and lower cost. Finally, the effectiveness of the proposed coupler structure is verified by simulation and experimental results. (c) 2023 Karabuk University. Publishing services by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).