Saad Tapuchi

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By replacing the inductor in a basic boost converter by a multiple-coupled-inductor, and adding two diodes and a capacitor, a new converter with a large conversion ratio and low stresses on the switches is obtained. The additional diode helps to circulate the leakage inductance energy to the load in a non-oscillatory manner. The transistor turns on/off with(More)
A high-voltage zero-voltage-zero-current-switched dc–dc converter with low voltage stress is presented in this paper. Its circuit structure is extended from a previously developed zerovoltage-switched dc–dc converter consisting of six series-connected switching devices, one three-phase transformer, and an output current tripler. The voltage stress on each(More)
A method that allows emulation of parameter uncertainties and external disturbances without any mechanical and electrical parts supplementary to the electric drive is proposed. The emulating signal reflecting the desired changes is created in software and added to the nominal controller output, forcing the unperturbed motor output to resemble the output of(More)
A new method for capacitance increase is proposed, thus allowing for capacitance standards with a sixfold higher value than those currently found in the market. The method can be used for capacitance increase in any standard and provides a solution for calibration problems of high-capacitance four-terminal meters. The increase in capacitance is based on the(More)
This paper presents a rigorous approach for the propagation of electromagnetic (EM) fields along a helical waveguide with slab and rectangular dielectric profiles in the rectangular cross section. The main objective is to develop a numerical method for the calculation of the output fields, for an arbitrary step’s angle and the radius of the cylinder of the(More)
This paper presents an improved approach for the propagation of electromagnetic (EM) fields along a helical hollow waveguide that consists of two bendings in the same direction. In this case, the objective is to develop a mode model for infrared (IR) wave propagation, in order to represent the effect of the radius of the cylinder of the helix and the step’s(More)
This paper presents a rigorous approach for the propagation of electromagnetic (EM) fields along a straight hollow waveguide with a circular cross section. The objectives are to present the technique to calculate the dielectric profiles and their transverse derivatives in the inhomogeneous cross section of the cylindrical hollow waveguide, and to understand(More)
Various methods for the analysis of wave propagation in the curved waveguides have been studied in the literature. Two interesting methods of investigation of propagation along the curved waveguides are based on the ray model and the mode model. A review of the hollow waveguide technology [1-2] and a review of IR transmitting, hollow waveguides, fibers and(More)
This paper presents the technique to solve inhomogeneous profiles in the cross section of the helical rectangular waveguide. We present the technique to solve inhomogeneous dielectric profiles and the relation to the method of the propagation of electromagnetic fields along a helical waveguide with a rectangular cross section. The inhomogeneous examples(More)