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This paper presents a new method of modifying interleave winding so the transformer leakage inductance and winding resistance, which are the main parameters in switch mode power supplies (SMPSs) design. The results are applied to the design of a single switch forward SMPS with an output of 1500 watts and good result as 92.5% efficiency and high reliability achieved.
This paper focuses on the harmonic at the network of the driving systems with DC motors and controlled rectifier. Notably, the total harmonic distortion factor (THD) is influenced by the rectifier commutation and by the load current filtering. We found these influences (thyristors commutation and filtering inductivity) concerning the waves of the currents in the secondary of the transformer and in...
Electromagnetic Interference (EMI) related measurements show that different types of electronic ballasts/starters built into public lighting devices with high pressure sodium lamps emit electromagnetic noises above the leves permitted by the relevant standards. Nowadays measurements and simulation efforts have been performed, however there are a lot of more aspects to be investigated. This paper describes...
The paper summarises the most wide-spread welding technologies and up-to-date energy converters for welding. Besides, it discusses the sensing, measuring, commanding and controlling problems of energy converters for welding, taking the multifunctional features into consideration. Some measurement results for both steady-state and transient conditions are presented, as well.
The paper investigates further improvements of an adaptive ANN (Artificial Neural Network)-based speed controller employed in a DTC-SVM (Direct Torque Controlled - Space Vector Modulated) drive. An on-line trained ANN serves as a speed controller and does not need a process model to predict future performance. In comparison to the previously published solution, auto-adjusting ability has been added...
The paper concerns the proportional-integral LQ control of a two-mass system. The LQ problem with the solution of both the continuous and discrete task of proportional-integral control of electrical drive is presented in the paper. The principle of design of the state and disturbance observer, used to reconstruct the state variables of the investigated plant, is also discussed. A control system, employing...
Nowadays switched reluctance motor (SRM) drives are widely used in the field of controlled electric motor drives. This paper proposes a simple control method for SRM drives. Current control of the reduced switching item number SRM drives contain modified current reference signal. This method provides that torque ripple is not significantly higher at a Miller-kind (n+1) transistor converter controlled...
In this paper a static switched capacitor with an auxiliary three-phase stator winding, which is only magnetically coupled to the stator main winding, is explored for improving the starting and operating power factor of a three-phase induction motor. The scheme improves the power factor of the motor without compromising significantly on other performances. Important advantages of the scheme include...
A 3-dimensional discrete model of a single inductor switching dc-dc converter is obtained in order to explain bifurcations observed after the period 1 dynamics instability. Although a one dimensional model, using the inductor current as a state variable, predicts the first main bifurcation, the voltage of both positive and negative outputs cannot be assumed to be constant to give a more accurate prediction...
A micro-controller-based dimmable electronic ballast for HPS lamps is presented in this paper. An easier and low-cost power control method is proposed in this paper, based on the regulation of the average input current of the inverter. Driving signal with low frequency modulation generated from MCU is used to eliminate unstable arc during dimming state. Experimental results for the commercial HPS...
Advanced control for automotive is one of the most promising research topic in the forthcoming decade. Actually, the long-term target is the substitution of most hydraulic car systems with their electronic counterparts. A bright example is set by the steering function, which has passed from pure mechanical to power assisted and recently to pure electrically power assisted function. The next step,...
Mobile AC/DC power supplies as being used e.g. for notebooks face challenging conditions: they should be compact, lightweight, not get too hot without any forced cooling, shock proof etc. Due to global usage wide input voltage range is a must. With increasing power demand of the processor and additional features of the notebook, output power increases, thermal management becomes hence an increasingly...
An accurate radio altimeter with a dual-channel (quadrature) homodyne receiver is presented in this article. This new design improves the accuracy while operating in the standard 4.3 GHz radio-altimeter allocation. The new radio altimeter is intended as a landing aid for small general-aviation aircraft, experimental aircraft and UAVs and is equipped with a simple synthesized-voice human interface
P-Channel MOSFETs are well known for their physical limitations compared to the N-Channel MOSFETs. Hole mobility is around three times smaller than electron mobility. Therefore a larger active area is necessary to achieve the same RDS(ON), thus making P-Channel devices more expensive. But they are equally known for their simplicity of usage. For applications in which a high side switch is needed,...
The presented paper deals with the matrix converter induction motor drive with emphasis on the PWM modulation strategies design. Matrix converters provide an all-silicon solution to the problem of converting AC power from one frequency to another, offering almost all the features required of an ideal static frequency changer. They possess many advantages compared to the conventional voltage or current...
The contact less energy transfer requires a transformer with air-gap. So organized transformer suffer with the no-negligible leakage inductance. When hard switching principle has been used the undesirable high surge voltage appears on the semiconductor elements. This paper treats the 500 W AC-DC converter based on HF-AC resonant link circuit in order to avoid the high surge voltage problems
There are sizeable pulsations in system with multi-phase electrical machines and PWM converters. They are increased under reduction winding pitch and decreased under using of multi-stage and multi-level converters and multi-phase paralleling reactors. Use of multi-stage convert-ers allows appreciably to decrease current load of capacitors in DC link.
In this paper, a complete analytical model of an axial flux permanent magnet synchronous machine (AFPMSM) is investigated. This modeling is based on an exact 2D solution of the magnetic field in the machine derived from the Maxwell's equations and coupled with the winding function theory to calculate the back EMF, the self and mutual inductances. The developed analytical model is then used to simulate...
This paper presents a circuit model of permanent magnet brushless direct current motor in which it is possible to simulate the phase open circuit faults and access the center of star-connected three-phase winding. The remedial strategies are introduced for the open-circuit of phase and power switch disconnection. The control system with two added electronic switches to the inverter can control the...
In the paper the radial and axial permanent magnet synchronous machines (RPMSM, APMSM) are classified in accordance with the types of design topologies and degree of active electromagnetic materials utilization. To realize an express comparison analysis of these machines the generalized geometric method is presented. Unlike the other methods this approach is distinguished by very small time for calculation...
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