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1
Content available remote Acoustic emission of monolithic IGBT transistors
Bejger A., Kozak M., Gordon R.
New Trends in Production Engineering
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2018
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Vol. 1, Iss. 1
755-760
EN
Due to the increasing number of applications of power semiconductor devices, more and more attention is being paid to diagnostic methods to determine the condition of working semiconductor components. On the basis of the results of experimental research, a correlation can be observed between the transition between the on/off states of a single IGBT transistor in operation and the acoustic signal emitted by it. Acquisition of acoustic emission signals was obtained using a specialized sensor from Vallen. To record the received signal, a high resolution digital oscilloscope was used, which exported the recorded signal to a file, which enabled further digital processing of the acquired signals. The aim of the study was to determine the usefulness of acoustic emission detection methods to determine the possibility of damage to an element based on the recorded acoustic signal.
2
Content available Detection and Recording of Acoustic Emission in Discrete IGBT Transistors
Gordon R., Dreas A.
Multidisciplinary Aspects of Production Engineering
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2018
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Vol. 1, Iss. 1
27--31
EN
The article presents the results of experimental research, which is to show a correlation between the change of operating status of single IGBT transistor and its acoustic emission. Sensor signal was obtained with oscilloscope in order to further process it digitally and determine possibility of the damage to the element based on registered acoustic signal.
3
Content available Wpływ napięcia zasilania tranzystora IGBT na otrzymany sygnał emisji akustycznej
Dreas A., Gordon R.
Badania Nieniszczące i Diagnostyka
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2018
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nr 4
62--64
PL
W niniejszym artykule przedstawiono serię pomiarów i poszukiwanie metody wykrywania uszkodzeń za pomocą przetwarzania sygnałów emisji akustycznej. Sygnał z czujnika obserwowano i przetwarzano za pomocą oscyloskopu i poddano obróbce cyfrowej. Celem była obserwacja wyjściowego sygnału przy zmianie napięcia zasilania, aby oszacować jego wpływ na sygnał z czujnika.
EN
This paper shows series of measurements and a search for method of signal processing. Sensor signal was obtained with oscilloscope in order to further process it digitally. The change of power supply voltage was also measured to estimated its influence on sensor signal.
4
Content available Control of squirrel-cage electric generators in a parallel intermediate DC circuit connection
Kozak M., Gordon R., Bejger A.
Zeszyty Naukowe Akademii Morskiej w Szczecinie
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2016
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nr 45 (117)
17--22
EN
The paper covers the theoretical background and tests of two asynchronous squirrel cage generators connected to voltage source inverters working in parallel. Inverters were connected in parallel by their intermediate direct current circuits by means of auctioneering diodes, and then to a DC power network. The real-time control algorithm of digital signal processor DSP and field-programmable gate array FPGA was used to achieve proper excitation of two different power machines, and to maintain high enough levels of direct current link voltage. Windings of both generators are fed by use of so-called machine side inverters. The asynchronous generator is a voltage source inverter controlled by a field-oriented control algorithm based on the current machine model. To prove robustness of the chosen algorithm, different types of load were applied while generators and inverters worked in parallel.
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