Wyniki wyszukiwania - BazTech

1

Charging Device of Capacitive Energy Storage for Micro Resistance Welding

Kozhushko Y., Karbivska T., Zinchenko D., Pavković D., Rosolowski E., Bondarenko O.

Present Problems of Power System Control

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2018

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Nr 9

5--17

EN

Micro resistance welding is the most common technology for making permanent connection between two conducting materials. This paper proposes a high-efficiency charging device for the capacitive energy storage within the micro resistance welding device power supply utilizing a Flyback converter. Based on the comprehensive analysis of charging device losses, it is determined that one of the main sources of conduction losses in the charging device is the output diode. In order to ameliorate this problem, utilization of a MOSFET transistor as an output diode within the Flyback converter is proposed in order to increase its overall efficiency. The presented results suggest that the proposed Flyback converter topology could improve the power efficiency by 7.0% at 50 kHz switching frequency through minimization of conduction losses in comparison with the traditionally-used Schottky diode.

2

Transistor Converter with Multicell Structure and Combined Control for Micro Resistance Welding Machines

Paerand Y., Bondarenko O., Bondarenko I.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 1a

86-90

EN

Micro resistance welding is effective way to reliably join small-scale parts in electronics industry and instrument-making. High quality welded joints are obtained by accurate regulation of welding current with transistor converter module which is one of the most important sub-systems in micro resistance welding machine. Multicell-type transistor converter with combined control, represented in the paper, provides high accuracy of current regulation and high energy efficiency therefore is proposed for use in micro resistance welding.

PL

Mikro zgrzewanie jest skutecznym sposobem łączenia małych elementów w przemyśle elektronicznym i produkcji oprzyrządowania. Wysokiej jakości połączenia spawane uzyskiwane są przez precyzyjną regulację prądu spawania w przekształtniku tranzystorowym, który jest jednym z najważniejszych podsystemów mikro zgrzewarki. Przedstawiony w artykule wielokomórkowy przekształtnik tranzystorowy o sterowaniu łączonym zapewnia wysoką dokładność regulacji prądu i wysoką sprawność energetyczną, z tego powodu jest zalecany do pracy w układach mikro zgrzewarkach.

3

Meiobenthiń polychaetes in the northwestern Black Sea

Vorobyova L., Bondarenko O., Izaak O.

Oceanological and Hydrobiological Studies

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2008

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Vol. 37, No.1

43-55

EN

Polychaetes of the northwestern Black Sea (NWBS) were sampled in January 2005 at 4 sites comprising 32 stations. The 4 sites have different anthropogenic loads, different depths (<10 m, 11-20 m, 21-30 m, >30 m) and different substrates (shelly, silty). The species composition of polychaetes in Black Sea meiobenthic communities has not previously been studied. Twenty polychaete species belonging to 11 families, the Phyllodocidae, Nephtyidae, Polynoidae, Sigalionidae, Nereidae, Syllidae, Hesionidae, Protodrilidae, Spionidae, Capitellidae and Ampharetidae, were recorded. The polychaete density varied with depth and type of substrate from 500 ind. m-2 to 66,000 ind. m-2.