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This article presents a substantial review of nonlinear memristive circuits based on Zdenek BIOLEK model alonside an innovator design developed within the Hewlett-Packard laboratories. HP realized a physical implementation of memristors by placing two layers of titanium dioxide between two electrodes. The first layer is partially doped with oxygen gaps and behaves like a semiconductor and the second...
In this paper is described a set of constraints applied to a wireless power-supply system (emitter and receiver) for operating in optimal conditions. These constraints regard both geometrical aspects and operational conditions of the system. There is also presented the performance optimization in the power wireless transfer. Starting from the equivalent scheme of a wireless power transfer system sinusoidal...
This paper describes the use of magnetic shielding materials for improving wireless power transfer (WPT) systems efficiency by increasing the inductance of printed circuit boards (PCB) inductors. Two off-the-shelf materials are compared with a specially-made ferromagnetic disc and the inductance and quality factor results are discussed.
Most of statistics currently show that almost every year a considerable number of accidents are happening due to weather conditions, and with a rate of nearly 78% [1] of them are due to the reflection of sunlight. The motivation of the paper is given by the desire to greatly reduce this percentage by providing assistance to the driver by keeping the conditions for optimum visibility both day and night...
This paper describes the research made in order to realize a wireless energy transfer system used for mobile phones using electrically separated circuits. To carry out this study we used different types for wireless power transfer circuits: the first circuit works at a frequency of 128 kHz and the second circuit works at a frequency of 1.7 MHz. All circuits were made with an electronic software design...
In this paper a series of constants, corresponding to wireless power transfer system (WPTS), are defined, function of S parameters. These constants will be further used for stability factors computation in WPTS. To generate: the reflection coefficients, the standing wave ratio (SWR), the input and output impedances, the input and output active power transmission efficiency, the signal transmission...
This study, using the theory of electric circuits, shows the right definition of scattering parameters (S-parameters) for any two-port electric circuit and the practical way to use these parameters in streamline the processes of information transmission and propagation, and the transfer of the active power from the electric quadrupole input (output) to their output (input). Starting from the correct...
High frequency signal integrity analysis in the transmission lines is a mandatory activity for engineers in the modern electronics technologies, analogue and digital as well. Thus because of continuously increasing of the signal speed in the transmissions lines is a must to ensure the signal is transferred from source to the destination with respect via cables in respect to the international Electromagnetic...
Switched networks modelling lead very often to discontinuities of circuit's variables corresponding to switching time moments. This phenomenon is said to have inconsistent initial conditions (IIC). The IIC problem appears only for ideal switches in ideal circuits when, after switching, the circuit contains excess elements. As a consequence, Dirac delta functions and their derivatives can occur in...
This paper presents how to implement the finite element method (FEM) to determine the magnetically coupled coils parameters. The method is applied for computing the parameters of the two resonators used in wireless power transfer (WPT). To compute the parameters corresponding to the resistance, self inductance, capacity and mutual inductance (R, L, C and M), we used CEDRAT Flux 2D software. The results...
The wireless power transfer systems (WPTS) work at frequencies between 20 kHz – 40 MHz. Considering the system consisting of two magnetically coupled coils, used in WPTSs, as a passive linear two-port network (PL2PN) in harmonic state, this paper describes the possibility of using the scattering parameters S in generating the power gains between the two ports of these coils. The amplification (or...
The purpose of calculation of parameters of magnetically coupled coils using Ansoft Q3D Extractor program is to find out the electric parameters: R, L, C and G.
This paper describes the use of WEBENCH Coil Designer for generating wireless power transfer PCB inductors for low and medium power portable systems without the need of complex calculations or complex layout design.
This paper presents the correct formulation of scattering parameters S, using electric circuit theory, and the practical use of these parameters. The purpose is to make more efficient the processes for the information transmission and the wireless electromagnetic energy transfer. The efficiency is seen from the transmission point of view of the signals (from the transmitter to receiver) and from the...
This paper deals with an analog circuit which identifies the largest element in a list of data encoded in the input currents. The circuit is of Winner-Take-All type, a well-known function in artificial neural networks. Thus the “Winner” cell “competes” with the other candidates, after a processing time being the only active cell. This circuit is made of MOS transistors operating in subthreshold, an...
This paper presents a procedure to optimize the structure of the two magnetic coupled coils used in the wireless power transfer systems (WPTS's). The optimization of the two magnetic coupled coils is performed in function of the alignment coils. There are two forms of deviation in the alignment of coils — the lateral displacement and the angular displacement. In the lateral displacement, the two coils...
This paper presents a study of the frequency splitting and bifurcation phenomena in the wireless power transfer systems. Using electric circuit model methods and mathematical calculus, the two phenomena are analyzed for all the possible configurations of the coupled circuits, i.e. seriesseries, series-parallel, parallel-series and parallel-parallel. For a specific case including two identical printed...
Our paper presents some procedures to optimize the performances of the two magnetically coupled coils used in the Wireless Power Transfer (WPT). The optimization of the two magnetically coupled coils is performed in function of their parameter values, for different structures, orientations, positions, and turn number of the two coils. Using the ANSYS Extractor Q3D Program the C, L, R, and G matrices,...
In this paper we present our research on several original circuits working as wireless power transfer systems (WPTS). All the circuits in the paper used sets of two magnetically coupled coils whose parameters were extracted by simulations using ANSOFT Q3D Extractor. The circuits were then simulated using TINA (DesignSoft), PSpice (Cadence Design) and Simulink in Matlab (Mathworks). We used existing...
This paper presents a procedure for wireless power transfer system (WPTS) parameter identification using ANSYS Extractor Q3D Program. For this, ANSYS Extractor Q3D Program is used to compute the C, L, R and G matrices, for different configurations, structures, frequencies and distances between coils. C and G - the matrices that are generated by the software from the field simulator outputs - are in...
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