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Estimating The Power Bjt Excess Charge Recombination Time Constant
Mikláš, Ján
The paper demonstrates an experimental way of estimating the excess minority carriers charge stored within the the power bipolar transistor in the saturation mode, i.e. with both junctions forward-biased, as a reference to future IGBT switching action analysis. The method is based on analyzing the transient turn-off base current waveforms at different conditions right before this event. The base current is known to supply the minority carriers within the device. Estimating the recombination time constant serves as a basal precondition for further identification of the excess charge storage depending on various operating conditions and retrospectively an accurate identification of power BJT and IGBT various partial stage of switching action.
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Power Switching Transistors
Mikláš, Ján ; Procházka, Petr (referee) ; Patočka, Miroslav (advisor)
In this thesis, prerequisities for a switching loss measurements are established as well as designing of DC-bus and the base/gate driver for the power transistors; followed by derivation of mathematical approximation of transistor conductivity gCE =iCuCE, circuit simulation using gCE as a transistor model and a discussion of measured waveforms.
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Optoelectronic sensor of polarization state of light from biological samples
Mikláš, Jan ; Brüstlová, Jitka (referee) ; Tománek, Pavel (advisor)
The living body tissues consist of cells which dimensions are bigger than a wavelength of visible light. Therefore a Mie scattering of reflected of backscaterred light occurs and different polarization states arise. The changes of polarization state due to the multiple scattering of light in the biological cellular tissues allow measure the aging of biological tissue. The reflected or backscattered polarized laser light exhibits multiple scattering on the sample surface and in its subsurface area.
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CFA application
Mikláš, Jan ; Havlíček, Tomáš (referee) ; Stehlík, Jiří (advisor)
The project is aimed at detailed analyse characteristics of (CFA – Current Feedback Amplifier) and realize an fitting aplication to demonstrate accomplishments as compared with voltage feedback amplifier (VFA).
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Architecture in landscape - Winery
Mikláš, Jan ; Vojtová, Lea (referee) ; Urbášková, Hana (advisor)
Master´s thesis deal with optimum proposal reset vineyard economy in viticultural area Strachotin. The task is utiliziation of landscape potential CHKO Palava and hydro-electric plant Nove Mlyny with promotion development agricultural tourism in the area. Theoretic part of thesis includes analyses inquiries and progression areas, production problems and vine processing. Practical part includes set of questionable drawings, used technology and material for security of correct performance function construction.
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