Volume 52, Issue 5-6, 2017

20170506-full
Issue 5-6, 2017

ELECTROTECHNICA & ELECTRONICA E+E

Vol. 52. No 5-6/2017
Monthly scientific and technical journal
Published by:
The Union of Electronics, Electrical Engineering and Telecommunications /CEEC/, BULGARIA

20170506-full

C O N T E N T S

ELECTRONICS

Emil Kovatchev, Georgi Mihov
Design and investigations on a high frequency resonant boost converter 1

Vencislav ...  read more

20170506-05
Ergonomic criteria for evaluating the quality of e-learning
Maria Todorova, Dimitrina Karamanska, Elena Koleva, Lilyana Koleva

Cite as:

The term “quality” is a wide-ranging concept for which each person or professional sector has its own definition. The most progressive quality point of view is that it is entirely determined by the customer or the end ...  read more

20170506-04
Traffic investigation of priority services in IP networks
Dimitar Atamian, Seferin Mirtchev, Rossitza Goleva

Cite as:

The paper presents an investigation of the quality of service of IP traffic flows, using different queueing disciplines. The main goal is to model the possibility of using a priority scheme, which is optimal for both the priority ...  read more

20170506-03
Overview of frequency compensations in the CMOS operational amplifiers, Part one – The basics
Georgi Panov

Cite as:

An overview of several common used frequency compensations in the CMOS operational amplifiers is presented. The advantages and disadvantages for each of them are given based on mathematical analysis. Practical circuit examples ...  read more

20170506-02
Practical approaches for reducing eddy current losses in transformer windings
Vencislav Valchev

Cite as:

The paper is focused on comparison of approaches for eddy current losses reduction in transformer windings. The study covers round wires and Litz wire designs. Design considerations are derived based on the advantages and ...  read more

20170506-01
Design and investigations on a high frequency resonant boost converter
Emil Kovatchev, Georgi Mihov

Cite as:

A practical design approach for a high-frequency resonant boost converter with zero-voltage switching (ZVS) technique is presented in this paper. The аdvantages of the soft resonant commutation have become more apparent with ...  read more