Wyniki 1-3 spośród 3 dla zapytania: authorDesc:"Abdelkader BELBOULA"

Modeling and Control of multimachines System Using Fuzzy Logic DOI:10.15199/48.2019.05.34

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AC machines, induction in particular have dominated the field of electric machines. Recently, researchers are interested in machines with a number of phases greater than three. These machines are often called «multiphase machines». This type of machine have large losses and to exploit these, it is possible to connect in series several machines supplied by a single static power converter with each machine in the group have an independent speed control. However, the use of multiphase converters associated with polyphase machines, generates additional degrees of freedom. Thanks to these, several polyphase machines can be connected in series in an appropriate transposition phases [1], [4]. For some applications, series connection of multiphases induction machines can be very interesting. The global system is defined as the domination of a series connected multi-machines mon-converter system (MSCS). This system consists of several machines connected in series in an appropriate transposition of phases. The whole system is supplied by a single converter via the first machine. The control of each machine must be independent of others [5], [7]. In [17], the author uses a classical PI controller to perform a speed control of series connected machines. However, PI controller parameters are highly affected by the system parameters, a temperature rise can cause a degradation of the control quality. Seen from this major drawback, our contribution is to change conventional controllers “PI" with fuzzy logic controllers and test its robustness. Modeling of Multi-machine System The drive system is composed by two induction machines. The first one is a symmetrical six-phase induction motor M(1) which its windings are series connected with that of a second three-phase induction motor M(2). The two motors are supplied by a single power converter which is a six-phase Voltage Source Inverter (VSI). Fig. 1 presents the connect[...]

Integrated Solenoid Inductor with Magnetic Core in a Buck Converter DOI:10.15199/48.2019.08.22

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The recent evolution in radiofrequency (RF) devices and integrated circuit technologies greatly expanded the number of wireless applications [1]. This expansion generated a growing demand for semiconductor manufacturers, requiring a higher integration in RF circuits. However, as passive device performances are directly tied to their geometry (especially for inductors), they end up being the bottleneck on radiofrequency circuitry integration. Inductors are of utmost importance in radiofrequency integrated circuits [2]. These devices are employed in critical building blocks of radiofrequency integrated circuits such as intermediate frequency filters [2], low-noise amplifiers [3], voltage-controlled oscillators [4], and power amplifiers [5]. Current on-chip spiral inductors suffer from large parasitic and area for a meager value of inductance and quality factor [6]. The need to overcome these issues has led to the development inductors with new geometries housing magnetic cores that show an enhanced inductance compared to the air core coil. In this paper, the behavior of solenoid inductors is systematically studied and the impact of the geometrical parameters on its inductance and quality factor. The principal object of my paper is to detail all the phases of design and modeling of a solenoid inductor in order to attain its realization and integrate it into a micro-converter [7]. This structure increases the quality factor value while reducing the constituent dimensions with a small manufacturing cost [8]. Design of solenoid inductor A simple solenoid inductor consists of a metal wire wound around a magnetic core, as shown in figure 1 [9]. Geometric parameters used in the schematic of an integrated solenoid inductor are as follows: the number of turns of the coil N, length of the coil lc, length of the magnetic core (air core) lm, spacing between turns s, width of the magnetic core wm, width of the air core wa, width of coi[...]

Integrated square shape inductor with magnetic core in a buck converter DC-DC DOI:10.15199/48.2019.09.11

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The always-augmenting demand for multifunctional and undersize portable electronic devices is driving the improvement of miniaturized DC-DC converters [1  3]. Such converters are used to shift voltage levels in electronic systems with high efficiency. There are multiple applications for such converters. For example, state-of-the-art portable smart phones and tablet PCs feature multiple components, such as the display panel, MEMS sensors, data storage devices, and cameras, which may require different operating voltage levels. Miniaturizing these converters reduces the overall size of the portable devices [4]. Passive components are the major factor in determining the overall size, cost and performance of portable products. The drive to further miniaturization and integration of portable electronic devices has recently focused on the task of passive functions [5, 6]. Integration of passive devices in the same silicon substrate is desirable in order to reduce this interconnect parasitic, reduce the size and cost of the units and increase the operating frequencies of the radio frequency circuits. Inductors are elementary and important parts in radio frequency integrated circuits [7, 8]. In this paper, the behavior of inductor is systematically studied and the impact of the geometrical parameters on its inductance and quality factor. The principal object of my paper is to detail all the phases of design and modeling of square shape inductor in order to attain its simulation and integrate it into a buck converter. This power inductor with magnetic core increases the quality factor value while reducing the constituent dimensions with a small manufacturing cost. Buck converter DC-DC The buck converter circuit is shown in figure 1. The switch T has a duty cycle D which ranges from 0 to 1. Figure 2 indicates relevant waveforms of the circuit when the switch T is turned ON and OFF at frequency f, with a duty cycle D [9]. T[...]

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