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National Repository of Grey Literature

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	Short-circuit protection of thyristor voltage source inverters through semiconductor fuses in their dc supply Bartoš, Stanislav ; Semerád, Radko ; Škramlík, Jiří Semiconductor devices based on the thyristor structure (GTOs, IGCTs, etc.) or power diodes exhibit high values of the parameter I2t. This enables them to be protected by the so called semiconductor fuses. However, in the dc feeding lene of the inverter, the short-circuit waveforms are strongly different from a half-sine wave, and the best way to find the proper fuse is to employ appropriate computer software. Detailed record
	Noise, vibration and electromagnetic phenomena produced by semiconductor converters in traction vehicles Budek, P. ; Chmelíček, M. ; Jehlička, Vladimír ; Škramlík, Jiří Due to the recent employment of up-to-date control electronic and electromechanical devices in cars of City Mass Transportation, new problems arise concerning the dynamics, noise, and the radiation of electromagnetic fields. Their environmental impacts, however, have not been discussed sufficiently, so far. Detailed record
	Control of Active Power filters by Using dSPACE 1103 board Škramlík, Jiří ; Valouch, Viktor Paper presents experience with the dSPACE 1103 board used as a controller of active power filter for the compensation of current harmonics of a non-linear load. Results of simulation and laboratory tests are presented and discussed. Detailed record
	Electromagnetic emissions of a trolley-bus with IGCT-based drive Doležel, Ivo ; Jehlička, Vladimír ; Škramlík, Jiří ; Valouch, Viktor The paper describes utilisation of a new IGCT-based element in DC inverter designed for feeding of a DC traction motor for trolley-bus. It deals with emissions of electromagnetic field (EMI) produced by operation of the inverter EMI was measured and calculated on a simplified model. Realised was a preliminary best during a low-speed trip within frequency range 150 kHz - 30 MHz. The results exhibit a good accordance with European Standards EN 50121-2, EN 50121-3-1. Detailed record
	EMI Generated by Trolley-Bus with IGCT-Based Drive Budek, P. ; Doležel, Ivo ; Jehlička, Vladimír ; Škramlík, Jiří ; Valouch, Viktor The paper describes the employment of a new IGCT element in a dc chopper designed for feeding a dc trolley-bus traction motor. The discussed radiated EMI noise generated during the chopper operation was measured and calculated on a simplified model. The preliminary slow moving tests within the range 150 kHz - 30 MHz were performed. The results of the measurements of magnetic field exhibit the compliance with the European Standards EN 50121-2, EN 50121-3-1. Detailed record
	Control of Active Power Filters by Using dSPACE 1103 Control Board Škramlík, Jiří ; Valouch, Viktor The paper presents some results obtained with the dSPACE 1103-based control system of a parallel Active Filter (AF) compensating current harmonics of a non-linear load. The main aim of the study was to evaluate the possibilities of the system dSPACE 1103 to control fast dynamics of the AF. Detailed record
	Some Practical Experience Obtained by Using the System dSPACE 1103 as the Controller of an Active Filter (AF) Škramlík, Jiří ; Valouch, Viktor The paper presents some practical experience obtained by using the system dSPACE 1103 as the controller of an active filter (AF) for the mitigation of current harmonics of a non-linear load. Among a lot of problems in this field, possibilities and effectiveness of the dSPACE 1103-based control system were studied in particular by using a selected control algorithm of the AF. Detailed record
	IGCT Switches Used for Traction Drives Bartoš, Stanislav ; Jehlička, Vladimír ; Škramlík, Jiří ; Valouch, Viktor ; Večerka, Tomáš So far, the Integrated Gate-Commutated Thyristor (IGCT) has always been considered as a device suitable for converters controlling the power of the order of megawatts or higher. Detailed record
	Sources of High-Frequency Emissions Produced in System Consisting of PWM Inverter, Long Cable and Induction Motor Valouch, Viktor ; Škramlík, Jiří ; Doležel, Ivo Operation of inverter-fed asynchronous motor drives is often accompanied by high-frequency interferences caused particularly by parasitic currents of the common and differential modes. These emissions propagated by conductionand radiation... Detailed record
	Parasitic Currents and High Frequency Interferences Produced in Circuits with Semiconductor Devices Valouch, Viktor ; Škramlík, Jiří ; Doležel, Ivo Power electric circuits with semiconductor inverters often represent sources of high-frequency interferences produced by parasitic currents of the common and differential modes.... Detailed record

National Repository of Grey Literature : 42 records found   21 - 30  jump to record:

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2	Škramlík, Jan

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