Performance Comparison of Nanocrystalline Material with Ferrite in a 40kW 20kHz Application Kapila Warnakulasuriya, Carroll & Meynell Transformers Ltd, UK,kapila@carroll-meynell.com Farhad Nabhani, Teesside University, United Kingdom,

Performance Comparison of Nanocrystalline Material with Ferrite in a 40kW 20kHz Application
 Kapila Warnakulasuriya, Carroll & Meynell Transformers Ltd, UK,kapila@carroll-meynell.com Farhad Nabhani, Teesside University, United Kingdom, F.Nabhani@tees.ac.uk Vahid Askari, Teesside University, United Kingdom, v.askari@tees.ac.uk
Abstract
 In this paper the performance of Nanocrystalline material in comparison with ferrite is evaluated for a high frequency high power transformer core application. The major advantage of Nanocrystalline material over ferrite is its ability to go for higher design flux densities. However, this is limited with increased losses occurring with the increase of operating frequency. The situation is studied for a 40kW, 20 kHz application. Samples of both versions are developed and a performance evaluation is made on the application. Based on the practical outcome a comparison is made in terms of power density per physical parameters such as weight and volume. The cost and manufacturability are also discussed.
LINK FULL PAPER
http://www.mediafire.com/download/h3zeuag0a3zzy2g/TRAFOS-MATERIALESNOVOS.pdf

NI Bulgakov CALCULATION TRANSFORMERS-Н.И. БУЛГАКОВ РАСЧЕТ ТРАРНСФОРМАТОРОВ-1950

LINK http://www.mediafire.com/download/ke390gb5mkkcb6n/Bulgakov.pdf

Research Issues for Energy Efficient Cellular Networks Prof. Vijay Bhargava-2013 제5회 정보전자융합공학부 국제심포지엄 포항공과대학교 Vijay Bhargava, Harri Siitari, Ajay Agarwal, Prasant Mohapatra, Mikio Aoyama, Dongman Lee, Ben Lee

The rising energy costs and carbon footprint of operating cellular networks have led to a trend in addressing energy-efficiency amongst the network operators and regulatory bodies such as 3GPP and ITU. "Greening" the wireless networks is a vast research discipline that needs to cover all the layers of the protocol stack and various system architectures and it is important to identify the fundamental trade-offs linked with energy efficiency and the overall performance. In this talk, we identify four important aspects of a green networking where we would like to focus: defining green metrics, bringing architectural changes in base stations, network planning, and efficient system design. We begin with a brief discussion on energy efficiency metrics. Since Base Stations (BSs) consume a major chunk of input energy, we discuss the energy efficiency of BSs. Next we discuss energy efficiency from a network planning perspective, based on smaller cells for heterogeneous networks. For system design, we put a special emphasis on cognitive and cooperative techniques in order to realize energy efficient cellular systems. Finally we discuss some broader perspectives and possible future trends in realizing a green cellular network technology.
 LINK ORIGINAL EN LA WEB
http://kocw.net/home/search/kemView.do?kemId=698269

Electronic Circuits -OPEN COURSEWARE -DAEGU UNIVERSITY

LINK
http://lms.daegu.ac.kr/ilos/ocw/opencourse_week_view_form.acl?OPENCOURSE_NUM=41&start=1&display=10&WRTSRC=&FIELD_NO=19

DESIGN OF BIRECTIONAL PWM SEPIC/ZETA DC-DC CONVERTER -SUNJO LEE-2009

DESIGN OF BIDERECTIONAL PWM SEPIC/ZETA DC-DC CONVERTER -SUNJO LEE
DEPARTMENT OF ELECTRICAL ENGINEERING  THE GRADUATE SCHOOL PUKYONG NATIONAL UNIVERSITY

LINK
http://www.mediafire.com/download/0n0s26c1dl0ya42/PWMSEPICFULL2009.pdf