Electronics

20190304-05
Review of hardware-in-the-loop – a hundred years progress in the pseudo-real testing
Nikolay Brayanov, Anna Stoynova

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In the last two decades, the electronics and mechatronics systems became undividable part of human life. With increasing of the number of application fields and functionalities, they became more complex and a lot more efforts ...  read more

20190304-04
Simple PV battery charger without MPPT based on SEPIC converter
Hristo Antchev, Anton Andonov

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This article describes a specific implementation of a SEPIC converter for charging an accumulator battery from a photovoltaic panel and which is characterized by simple control without MPPT. Here are presented some basic mathematical ...  read more

20181112-04
Overview of gyrator based Gm-C filters and their applications
Atanas Tanev

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This paper reviews gyrator based Gm-C filters and their characteristics. The most common gyrator based Gm-C filter architecture is described. Different types of gyrator biquad are presented as well as ...  read more

20140102-08
Behavioral modeling and simulation of digital phase-locked loops using VHDL-AMS
Marieta G. Kovacheva

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This paper presents a simulation VHDL-AMS – based model of digital phase-locked loop – PLL (DPLL) for mixed-signal applications. The described model is of behavioral type, which ensures in a large extend its versatility. ...  read more

20140102-07
PSpice model of a brushless machine operating in a generator mode by converting the inverter in a boost converter
Ivan P. Maradzhiev, Emil I. Dinkov

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Brushless machines are increasingly used in various fields of engineering, due to their simplicity, reliability and easy manner for control. The present paper is focused on the machine operation in a generator mode. Modeling ...  read more

20140102-06
Analysis of a current source supplied inverter
Peter T. Goranov

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The article describes the performance of parallel current fed inverter, supplied with ideal current source. The analytical expressions are derived, basic characteristics and parameters are shown with resistive and resonant ...  read more

20140304-04
A linear converter of strain-gauge bridge bidirectional disbalance into frequency deviation
Svilen H. Stoyanov

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The measurement of mechanical force and torque magnitudes by means of strain gauges based on a new method for “transforming resistance into frequency” is the object of investigation in this paper. It presents the development ...  read more

20140304-03
Modelling of step-up DC converter
Vladimir V. Dimitrov, Peter T. Goranov

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In the current paper building on the sound theoretical foundation of state-space methods a model for the boost converter is presented. Replacing some elements in the ideal power convertor with their nonideal equivalent circuits ...  read more

20140304-02
Near-field measurements using low cost equipment for RF device characterization
Radoslav B. Borisov, Kaloyan I. Zlatkov, Plamen I. Dankov

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Near-field electromagnetic scanners are widely used for microwave, antenna and electromagnetic compatibility measurements. The scanner determines the spatial distribution of an electrical quantity provided by a single or multiple ...  read more

20140304-01
Fabrication of flexible hybrid low molecular weight compound/polymer light emitting device by screen printing
Mariya P. Aleksandrova, Irena P. Nestorova

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It is demonstrated successful fabrication of simple bicomponent single layer OLED produced by screen printing. The device exhibits high mechanical stability after 400 cycles of bending. Turn on voltage of 5 V and maximum brightness ...  read more