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The paper considers a new electric diagram of the microelectronic self-excited oscillator based on the bipolar transistor structure with negative resistance. The oscillator operates in oscillatory and relaxation modes. Chaotic mode of the self-excited oscillator was provided by installing additional components into a basic circuit. Results of the deterministic chaos microelectronic oscillator simulation...
In this paper we review recent work on computational paradigms involving coupled relaxation oscillators built using metal-insulator-transition (MIT) devices. Such oscillators made using MIT devices based on Vanadium-Dioxide thin films are very compact and can be realized in hardware. Networks of such oscillators have interesting phase and frequency dynamics which can be programmed to solve computationally...
Spin torque oscillators (STO) have drawn significant attention from the research community as potential replacements for electrical oscillators due to their simple and compact structure.
The paper considers an electric circuit of a microelectronic oscillator based on a BJT-MOSFET structure with negative differential resistance. A mathematical model of this oscillator has been developed. Theoretical and practical researches of oscillations dynamics have been carried out. Lyapunov exponents have been calculated. Limits of periodic and chaotic oscillations modes have been determined...
In the paper a deterministic chaos oscillator based on a bipolar and field-effect transistor structure with negative resistance is proposed and examined. A modified mathematical model of Anishchenko-Astakhov is proposed for describing the chaotic oscillation dynamics. The results of mathematical modelling and experimental research are obtained.
A dc circuit breaker (DCCB) based on a superconducting current-limiting technology was proposed for the interruption of short-circuit fault currents in high-voltage dc (HVDC) systems. The proposed DCCB includes a superconducting current-limiting module (SCLM), which is used to limit fault currents, and an interrupter module (IM), which uses a self-excited oscillation method to interrupt the limited...
This paper presents two new applications of modified version of the voltage differencing current conveyor (VDCC) active device in electronically linearly controllable quadrature oscillators. In this particular case, VDCC element is modified in such a way that it uses electronically adjustable current gain controlled independently in each of output current branches of this device. Brief Spice simulation...
This contribution propose a design procedure applicable to many kinds of wireless or contactless energy transfer systems. The design procedure is limited to near field wireless energy transfer systems in resonant operation. Therefore it is well applicable to systems with a primary side power oscillator or systems with a control strategy that forces an equal system behavior compared to a primary side...
The additive white noise impact on dynamics of the Kiyashko-Pikovsky-Rabinovich oscillator based on a field-effect transistor structure with negative resistance has been considered. The results of the mathematical modelling the deterministic chaos oscillator in presence and in absence of white noise have been obtained. The white noise impact on dynamics and parameters of the generated chaotic oscillation...
Considering simulations of electromagnetic transients and searching for better results, it is investigated the limits of the change of the representation of the longitudinal parameters in the model of infinitesimal unit of transmission lines' model. It is introduced a damping resistance in parallel to the impedance that represents the longitudinal parameters of transmission lines. Several simulations...
The effect of inverter dead-time on the inverter output voltage is well studied in literature. This paper studies the effect of the dead-time on the inverter input current, and includes this effect in the dc link dynamic model of a diode-bridge-rectifier (DBR) fed voltage source inverter (VSI). Based on this study, this paper proposes a dynamic model of a rectifier-inverter-fed induction motor, that...
In the paper the results of theoretical and experimental researches of the chaos oscillator with inertial non-linearity based on a bipolar transistor structure with negative resistance are given. The dynamic processes in such oscillator are shown to be described with the Anishchenko-Astakhov mathematical model. Numerical simulation results are confirmed with experimental data.
In the paper, the wide-spread mathematical models of the deterministic chaos transistor oscillators are considered. These models describe dynamic processes to take place in transistor Colpitts oscillators. Variations of the deterministic chaos transistor oscillator's schemes are presented. Phase portraits, time and spectral diagrams of chaotic oscillation were obtained.
Mosquito-borne diseases, such as malaria and dengue, are major health concerns in the Philippines. This research provides a CMOS RC oscillator that operates at frequency based on the wing-beat frequency of male mosquitoes and dragonflies, in order to produce ultrasonic signal that repels biting female mosquitoes. This work presents the design and chip layout of CMOS RC oscillator which comprised of...
Actively simulated grounded floating capacitance multipliers have been used in several applications ranging from filter to oscillator design as well as cancellation of parasitic capacitances. In this paper, a new electronically-controllable floating lossless capacitance multiplier (C-Multiplier) circuit is presented, which employs only one Voltage Differencing Current Conveyor (VDCC), one grounded...
This paper describes the adaptive perturb and observe (P&O) MPPT controller based on a sectionalized piece-wise linearization of the P-V curve. The algorithm divides the curve into three non-uniform sections, depending on the location of the maximum power point (MPP). Furthermore, the step size (M) is varied linearly according to the slope of the P-V curve. This results in high tracking speed...
In this paper, we propose a current-mode based solution suitable for triangular/square wave generator using second generation current conveyor. The proposed oscillator, which utilizes two second generation current conveyor (CCII) as active elements, three resistors and a capacitor, is based on resistance-capacitance (RC) cell and found to be effective alternate of voltage-mode based oscillators. Experimental...
The Virtual Synchronous Generator (VSG) is an effective solution for high-penetration renewable energy sources integrated into the power system. Although the VSG has a similar behavior as the conventional synchronous generator, the fast and flexible control capability of converters may give rise to some specific characteristics. In this paper, it is explained that flux dynamics may induce synchronous...
This paper investigates the robustness of predictive deadbeat current control applied to a surface permanent magnet synchronous motor (PMSM) due to model parameter uncertainty. This kind of control is considered as model based control and it is very sensitive to model parameter mismatch. Two different methods to improve control robustness are presented and compared.
This paper introduces the replacement of four and six resistors with four and six memristors at the same time for the modified single input Op-Amps oscillator. The full independency between the oscillation condition and the oscillation frequency facilitates the study. Mathematical analysis is provided for the double replacement of resistors with memristors. The whole range of operation of the memristor...
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