year 2017

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

Ergonomic criteria for evaluating the quality of e-learning

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 user and is ...  read more

Traffic investigation of priority services in IP networks

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 and ...  read more

Overview of frequency compensations in the CMOS operational amplifiers, Part one – The basics

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 are shown ...  read more

Practical approaches for reducing eddy current losses in transformer windings

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 disadvantages ...  read more

Design and investigations on a high frequency resonant boost converter

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 the trend ...  read more

Issue 7-8, 2017

ELECTROTECHNICA & ELECTRONICA E+E

Vol. 52. No 7-8/2017
Monthly scientific and technical journal
Published by:
The Union of Electronics, Electrical Engineering and Telecommunications /CEEC/, BULGARIA

20170708-full

C O N T E N T S

ELECTRONICS

Georgi Panov
Overview ...  read more

From electrica to invariant automatica (Or how to use the knowledge about Theory of electricity for enter into Theory of invariant automatic control) Part one: System and invariant electric model

От електрика към инвариантна автоматика (или как да използваме познанията си по „Теоретична електротехника“ за да вникнем в управлението ...  read more

Practical implementation of integrated ambient light sensors in visible light illuminance measurements

Modern Ambient Light Sensor (ALS) integrated circuits can be used not only in control and automation tasks they have been designed for but due to their useful additional features can also be implemented at the heart of measurement platforms ...  read more

Non uniform array antenna with three Luneburg lenses

This article is an extension of research on the method of compressed cosines in array antennas synthesis. Theory and technical solution for the synthesis of non-uniformly spaced linear array with three Luneburg lenses are proposed. ...  read more