Electronics

20210102-03
Thermal model of bidirectional DC/DC converter
Evgeni Malev

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The purpose of this article is to create and analyze a mathematical model of Isolated full-bridge bidirectional DC/DC converter for electric vehicle application. The article considers and analyzes mathematical models of the ...  read more

20200508-03
IoT device with Global Positioning System using SigFox, ThingSpeak, and Anaconda platform
Takeshi Tanaka, Nobuharu Okamitsu, Kenshi Nishino

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We have developed a rudimentary Internet of Things (IoT) device equipped with a global positioning system module using the Sigfox network. The data sent from the IoT device using Sigfox Cloud and ThingSpeak are received and ...  read more

20191112-02
Experimental validation of the frequency multiplexing method of simultaneous wireless transmission of energy and information signals
Lyudmil Petkov, Nikolay Madzharov

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Wireless energy transfer and bidirectional transfer of information and control signals, using the same inductive connection, has been a current topic of research in recent years. Depending on the required transmitted power ...  read more

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