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A practical solution is presented for the design of a non-isolated high voltage DC/AC power converter. The converter is intended to be used as a class D audio amplifier for a Dielectric Electro Active Polymer (DEAP) transducer. A simple and effective hysteretic control scheme for the converter (buck with fourth-order output filter) is developed and analyzed. The proposed design is verified experimentally...
Temperature is a key factor that influences the dynamic performance of lithium-ion batteries. The purpose of this study is to investigate the effects of temperature on dynamic characteristics of lithium-ion battery. In this article, the charge and discharge behaviors are studied through battery tests at different temperatures. Based on the tests, the maximum available charge and discharge capacity...
This paper presents an alternative methodology for the grounding resistance calculation of vertical electrode arrays through a computational algorithm. This algorithm was developed based on the fundamental equations for the self and mutual resistance between grounding rods calculation being it's result confronted with the a model based on the finite element method (FEM) and the formulas found in the...
Optimization design for complex pipelines inside electromechanical products is a very difficult task within complex products such as cars, planes, ships and rockets. Thus, an optimization design for complex pipelines is proposed based on the flow resistance loss in this paper. The basic framework of the design includes three parts like pre-processing, evalution model and optimization search algorithm...
This paper introduces an analog-to-stochastic converter using a magnetic-tunnel junction (MTJ) device for stochastic computation. Stochastic computation has recently been exploited for area-efficient hardware implementation, such as low-density parity-check (LDPC) decoders and image processors. However, power-and-area hungry analog-to-digital and digital-to-stochastic converters are required for the...
Based on the I–V equation of photovoltaic (PV) cell and the output characteristics of maximum power point tracking (MPPT), this paper proposes a novel identification method to identify four key parameters of PV array: photo current Iph, negative saturation current I0 , diode ideality factor n and the series resistance of cells Rs, by using the measured input and output data of PV array. According...
In this paper, we develop a nonlinear multicompartment lung mechanics model that accounts for nonlinearities in both the airway resistances and the lung compliances. Many models assume that the airway resistances for a lung mechanics system are constant over the entire range of air flows, and hence, pressure losses due to the airway resistances are assumed to be linear functions of the air flows....
It is known that a constant power load connected to DC electrical network may lead to instability problems on the DC-link variables. This paper addresses this problem of instability. To do this, a supercapacitor which is an energy storage element connected to the network is used to stabilize. To achieve this goal, a nonlinear control law based on backstepping approach is synthesised and robustness...
We present the design of an analog circuit which solves linear programming (LP) or Quadratic Programming (QP) problems. In particular, the steady-state circuit voltages are the components of the LP (QP) optimal solution. The proposed method is used to implement a LP-based Model Predictive Controller by using an analog circuit. VLSI design of an LP problem demonstrates nanosecond range solution latency...
This paper proposes a theoretical study supporting the use of simplified single-diode photovoltaic (PV) models to accurately reproduce the behaviour of PV generators. In particular, a newly defined parameter is introduced, which allows to classify PV modules according to the possibility to neglect either the series- or the shunt resistance in the circuit model. On such a basis, equations allowing...
This paper presents an LTSpice model for a Phase Change Memory (PCM) cell that accurately simulate the temperature profile, the crystalline fraction and the resistance of the cell as a function of the programming pulse based on physical theories. The model is able to generate the I-V characteristics of a PCM cell, and precisely simulate the drift phenomenon of resistance and threshold voltage at the...
The thermal stability Δ is a key parameter of the MRAM technology. It determines the current induced switching behavior as well as the reliability performance of e.g. data retention and read-disturb. Therefore a highly accurate assessment of Δ is mandatory for a successful MRAM technology development. In this paper we present a verification methodology based on the statistical data of a 8Mb test vehicle...
This paper introduces PVID, an interactive application for performing parameter identification of both complete (5-parameter) and simplified (4-parameter) single-diode photovoltaic (PV) models. Two equations are presented that allow to perform on-line 4-parameter identification without exploiting iterative methods. They are useful, for example, to support a maximum power point tracking (MPPT) algorithm...
In this investigation, the “archipelago” design is presented as a platform for skin-mounted wearable and stretchable electronics. The electronic components of the design were distributed between islands connected by stretchable serpentine structures. The analytical results show that at 20% overall elongation, the serpentines stretch 60% due to the rigidity of the islands. This 20% elongation is defined...
This paper explores the robust design of Colpitts and Hartley oscillators. Considering the uncertainty and unmodelled dynamics for Colpitts and Hartley oscillators, the period and amplitude of the limit cycle will change. The uncertainty for these nonlinear oscillators is due to the fact that the capacitance and resistance will be changed in practical applications, especially for integrated circuit...
Effects of AlOx interfacial layer in the W/AlOx/TaOx/TiN structures have been investigated for the first time. This RRAM device shows long endurance of 106 cycles and good retention at 85°C for a low current compliance of 100 μA. A physics based simulation is studied to understand the set and reset mechanism of RRAM. The nature of ions migration, potential profile and temperature of filament during...
This work aims at resolving the issue of a model that uses symmetrical mathematical components, dedicated to longitudinal simple unbalance for three phase radial transmission electrical lines of an electricity distribution system. The symmetrical component of both current and voltage are obtained, as well as values of the electric distribution system parameters, in order to determine imbalance factors...
In this paper the effect of SET temperature on data-retention performances in HfO2-based RRAM has been thoroughly investigated. We demonstrated, for the first time to our knowledge, that high temperature programming (even if it has no influence on the initial resistance) has a strong effect on thermal stability of the conductive filaments. Moreover, we highlighted the impact of SET temperature also...
This paper proposes a new control strategy and design for auxiliary power source using in Battery Hybrid Electric Vehicle (BHEV) based on acceleration power. The control strategy takes actual speed, acceleration and terminal voltage of supercapacitors (SCs) into account for controlling the energy and power demanded. The detail design of the auxiliary power source and its dynamic control are demonstrated...
The paper provides an alleviated calculation of the distances S, which is based on the assessment of the lightning current distribution through the elements of the lightning system. The methodology avoids the complex computational procedures connected with the programmes for field analysis. Instead of that, the task is reduced to the analysis by the help of the nodal approach in matrix form, in combination...
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