issue 3-4

20160304-02
Specific occurrences in DC/DC converters used in flyback mode
Tatyana Neycheva, Jecho Kostov

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The flyback commutation mode is usually chosen when capacitor has to be charged to certain high voltage. The power source supplies portions of energy into the field of air gap transformer that are further transferred to the ...  read more

20160304-01
State of the art of structures and main components of hybrid and electric vehicles
Gergana I. Vacheva, Nikolay L. Hinov

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The main objective in this paper is to review the most widely used structural schemes of hybrid and electric vehicles and their basics blocks. The various sources of energy are consistently presented – fuel cells, batteries ...  read more

20170304-full
Issue 3-4, 2017

ELECTROTECHNICA & ELECTRONICA E+E

Vol. 52. No 3-4/2017
Monthly scientific and technical journal
Published by:
The Union of Electronics, Electrical Engineering and Telecommunications /CEEC/, BULGARIA

20170304-full

C O N T E N T S

TELECOMMUNICATIONS SCIENCE

Georgi Balabanov
Challenges of quality of experience management for cloud based ambient assisted living services and applications 1

Mircho Mirchev, Seferin Mirtchev
Network topology analysis – graph properties that matter 5

ELECTRONICS
Emil N. Kovatchev, Nadezhda L. Evstatieva
Analysis and investigations on a digitally controlled LED buck driver for automotive LED applications 13

Elena G. Koleva, Lilyana S. Koleva, Georgi M. Mladenov


 ...  read more

20170304-05
Conceptualising of smart education
Elena Shoikova, Roumen Nikolov, Eugenia Kovatcheva

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Smart education, a concept that describes learning in digital age, has gained increased attention. Broadly defined, smart learning environments represent a new wave of educational systems, involving an effective and efficient ...  read more

20170304-04
Model-based optimization of electron beam welding for obtaining defect-free welds
Elena Koleva, Lilyana Koleva, Georgi Mladenov

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The optimization of welds obtained by electron beam welding is a multi-criterial task, involving the requirements for the geometrical characteristics of the welds, together with the fulfilment of the requirements for lack ...  read more

20170304-03
Analysis and investigations on a digitally controlled LED buck driver for automotive LED applications
Emil N. Kovatchev, Nadezhda L. Evstatieva

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This article presents a configurable constant current LED driver with DSP digital control. A novel, cost-effective high-side current sensing circuit provides feedback signal, proportional to the average LED current. A fast ...  read more

20170304-02
Network topology analysis – graph properties that matter
Mircho Mirchev, Seferin Mirtchev

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This article presents correlation between network metrics with graph properties, more specifically spectral graph characteristics. This work is in the foundation of network topology analysis based on the relevant graph representation ...  read more

20170304-01
Challenges of quality of experience management for cloud based ambient assisted living services and applications
Georgi Balabanov

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The aim of the Cloud Based Ambient Assisted Living (CBAAL) refers thus to the study and development of intelligent systems to support independent living of senior citizens, compensating for prevailing age-related physical ...  read more