Browsing by Author "Tekin, Ahmet"
Now showing items 21-39 of 39
-
High frequency power supply design
Zengin, Özlem Özden (2019-08-20)Portability, power density, and energy e ciency are among the hottest topics of today. Therefore, the need for higher power-capacity, smaller size, and higher e ciency power supply is increasing day by day. At this point, ... -
An improved speed controller for PMSM drive with unbalanced load using load torque observer
Yoldaş, Koray (2019-05-22)In order to overcome disturbance effects as load torque variations in Permanent Magnet Synchronous Motor (PMSM), an improved controller with feed forward compensation is presented in this study. Washing machines which are ... -
An improved speed controller for PMSM drive with unbalanced load using load torque observer
Yoldaş, Koray; Tekin, Ahmet; Boztepe, M. (IEEE, 2019)In order to overcome disturbance effects as load torque variations in Permanent Magnet Synchronous Motor (PMSM) of washing machines, an improved controller with feed forward compensation is presented in this paper. A few ... -
Investigation on the effects of dc-link capacitors to DC/AC converter under various operation conditions
Bilgin, Mert Serdar (2019-05-29)In the designing stage of a DC/AC converter, determining parameters of components has an essential role such as value, size and material type. DC-Link capacitors are the critical components for DC/AC converters and define ... -
Lighting design considerations and channel modeling for visible light communications
Safaraliev, Sadi (2019-06-10)There has been an extensive work on visible light communication (VLC) mainly due to scarcity in radio frequency (RF) spectrum and urgent need for a new wireless communication system in the near future. VLC considers the ... -
Low-cost thin-film passive RFID circuits and detector system
El-Sawy, Salma; Nawaz, Wasim; Abouzeid, Mohamed Osama Hussein Soliman; Tekin, Ahmet (Cambridge University Press, 2020-06)This paper discusses the design of chip-less RFID tags of a standard pocket size of 69 mm by 156 mm. These tags are based on lumped elements of copper metal traces constructed on a thin polyamide flexible substrate. Moreover, ... -
Modeling of RF energy harvesting and energy consumption system for low power wireless sensor networks
Amjad, Osama (2017-01)Recently, with the advancement of technology, there has been a rapid growth of low power wireless devices, such as wireless sensor networks (WSNs) and Internet of Things (IoT). Therefore, the energy requirement for perpetual ... -
A new LED driver design with CRM flyback topology and high power factor and low total harmonic distortion
Kavcı, Mustafa (2018-01)In many of today's solid-state lighting (SSL) applications, Critical Conduction Mode (CRM) Flyback PFC converter is a popular solution due to its limited component count and simple structure with respect to other switched ... -
Omni-directional wideband antenna array with solar cells
Ullah, Naveed; Tekin, Ahmet (SciELO - Scientific Electronic Library Online, 2021-03)Distributed sensor networks are becoming more and more widespread due to their substantial benefits to our daily lives. These sensors, in most cases, are distributed in nature and even may require mobility. This, in turn, ... -
Optimization and analysis of WLAN RF energy harvesting system architecture for low power wireless applications
Munır, Syeda Wajıha (2017-01)The presented work proposes a radio frequency (RF) energy harvesting circuit design, which scavenges energy from WLAN dual frequency band. In comparison to other available sources for energy scavenging, e.g. solar, wind ... -
Patterned polymer films using soft lithography and micro molding in capillaries (MIMIC)
Asıf, Afia (2017-05)This research work reports a low cost method to pattern large area surfaces using soft-lithographic approach through several polymers, particularly with the self-assembly of block co-polymers (BCPs) and also by fabricating ... -
Resonance-filtering combo system for continuous wireless charging range coverage
Sağlam, Üstün; Tekin, Ahmet (Cambridge University Press, 2020-09)Distribution of wireless power charging field uniformly on a large area pad is critical for power receivers, particularly for wearable devices, wherein small form factor coils are involved. Since the receiver coil size is ... -
A robust voltage control method for universal ev battery charge llc resonant converters
In this study, a novel control method for LLC resonant converter with wide output voltage range and constant switching frequency is proposed targeting wide range of Electric Vehicle (EV) battery charger standards. In ... -
A robust voltage control method for universal EV battery charger LLC resonant converters
Daş, Y.; Tekin, Ahmet; Boztepe, M.; Tarhan, C. (IEEE, 2019)In this study, a novel control method for LLC resonant converter with wide output voltage range and constant switching frequency is proposed targeting wide range of Electric Vehicle (EV) battery charger standards. In ... -
A semantic policy framework for internet of things
Göynügür, Emre (2018-10-31)With the proliferation of technology, connected and interconnected devices (henceforth referred to as IoT) are fast becoming a viable option to automate the day-to-day interactions of users with their environments. However, ... -
A sub-sampling pulse-resonance OOK modulated digital ultrasound communication system for biomedical IoT
Abouzeid, Mohamed Osama Hussein Soliman; Tekin, Ahmet; Mohieldin, A. N. (Elsevier, 2019-11-01)A pulse-resonance On-Off keying ultrasound communication microsystem is presented. It is a viable alternative to today's widely used RF technologies in order to avoid the associated health risks for a specific group of ... -
A sub-sampling pulse-resonance OOK modulated digital ultrasound communication system for medical IOT
Abouzeid, Mohamed Osama Hussein Soliman (2018-04)This dissertation presents a new ultrasound communication microsystem (Pulsed Resonance On-Off Keying) as a viable alternative to today's widely used RF technologies in order to avoid the associated health risks. Special ... -
Total harmonic distortion and power factor improvement technique for CRM flyback PFC converters
Kavcı, Mustafa; Tekin, Ahmet; Tarhan, C. (IEEE, 2019)In many of today's solid-state lighting applications, Critical Conduction Mode (CCM) Flyback PFC converter is a popular solution due to its limited component count and simple structure with respect to other SMPS topologies. ... -
A wideband smart EMF detector for mobile devices
Tekin, Ahmet (Istanbul University, 2021-01)A wideband electromagnetic field (EMF) sensor system is introduced in this study. This small form factor, low-cost system is intended for use with smart mobile devices and can precisely measure the imminent field strength ...
Share this page