Electronics

20190910-03
DC-DC converter for interfacing PV panel to micro-inverter
Zahari Zarkov

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Photovoltaic (PV) energy has become competitive in power generation as an alternative to fossil fuels over the past decades. The installation of solar energy systems is expected to increase rapidly with the further development ...  read more

20190708-04
Academic writing and integration of technology
Maria Todorova, Elena Koleva

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Communication in a foreign language is already becoming a daily routine for many, personally, professionally and academically. Professional realization requires skills for writing documents such as biographies, cover letters, ...  read more

20190708-03
Simulation design of piezoelectric ultrasonic IoT-sensor (PMUT)
Mila Ilieva-Obretenova

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Of particular interest is the development of an aromatic image synthesizer that can reproduce a given variety of aromas in the surrounding environment, leading to indirect changes in psychophysiological indicators and behavioral responses of the human body.

 ...  read more

20190304-06
Simulation of the temperature distribution and modelling of molten pool parameters at electron beam drip melting of copper
Tsvetomira Tsonevska, Elena Koleva, Lilyana Koleva, Georgi Mladenov

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In this article quasi steady-state two-dimensional heat model is implemented for the simulation of the temperature distribution in the cast copper ingots through electron beam drip melting. Regression models are estimated ...  read more

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