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Przedstawiono porównanie parametrów dławików kolumnowych i toroidalnych oraz dławików toroidalnych z różnymi uzwojeniami, a także analizę wpływu konstrukcji na parametry częstotliwościowe
This article deals with the subject of simulation of power losses and thermal processes occurring in semiconductors, as illustrated by an example of a DC/DC buck converter. The simulations were performed in PLECS software. The results obtained from the program were compared with measurement results of a laboratory converter model. The physical model is based on the same components as assumed in the...
The properties of SiC Power Mosfet transistors have been known for years and have been extensively described in the literature. Also, new generations of SiC transistors and diodes are being developed. Power Mosfet transistors are mainly used in power electronics applications in which such transistors operate as controlled switches. In this case, equipment design engineers focus their attention on...
A universal control method for shunt active power filters based on the notion of load equivalent conductance is presented. The considered technique is often referred to as the closed-loop indirect control, or the global compensation method. This technique is universal in use and may be easily implemented for three-phase network as well as for AC or DC ones. In the first part of the paper the general...
As new power transistors, such as SiC Mosfets, are being increasingly used in power electro- nics systems, it has become necessary to use special drivers. This article compares the parame- ters of SiC Mosfet, Si Mosfet, and IGBT gate circuits. Differences are discussed with reference to the ways in which these transistors are controlled. Gate circuit parameters of SiC transistors differ slightly from...
Currently, manufacturers of power-electronic components are trying to introduce the silicon carbide (SiC) technology in their products and MOSFET transistors made with this technology are available on the market. They are characterised by a significantly higher operating frequency, reaching even 100 kHz and low switching losses. The application of this type of devices causes high voltage gradients...
This article describes an application of fuzzy logic in a gap controller for an electrical discharge machine. The controller was built using an STM32F4 microcontroller with an ARM Cortex M4 core. Gap controllers are one of the key control circuits in electrical discharge machines. The performance of a gap controller determines machining speed, tool electrode wear and machined surface quality. As the...
In order to build a tram-train transport system, it is necessary to have a rail vehicle capable of running off both 3300Vdc railway electric overhead lines and 600Vdc tramway overhead lines. One of the solutions would be to build a high voltage reducing converter. This article presents a design of a resonance converter with a toroidal transformer and discusses results of laboratory tests carried out...
This article discusses common circuit designs for power supplies used in spark erosion machines. The author proposes the use of a linear current source as a generator. Moreover, he presents several solutions of electronic controlled current sources based on an operational amplifier and a power Mosfet transistor. One of the solutions has been selected for further tests, including verification with...
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