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This paper presents a bridgeless SEPIC topology with Power Factor Correction (PFC) to charge electric vehicle battery. The converter offers a few advantages such as reduce total component count and reduction of conduction loss during the conversion AC to DC, hence higher overall system efficiency. The PFC converter operated under continuous conduction mode (CCM) with average current mode control strategy...
This paper presents a method for obtaining an accurate model of the solar cell panel, based on manufacturers' electrical parameters at only one operating condition. It implies the computation of the five parameters model in reference operating condition without any experimental data and the elaboration of a Simulink block for solving the implicit nonlinear I-V solar cell equation. The Simulink block...
Digitization of the control loop for high frequency dc-dc switching converter are increasing the application areas of modern semiconductor based power system. This paper aims at detail modeling of buck converter design considering the ESR resistances and incorporates the optimized ADC converter, DPWM and PID compensator loop to enhance and stabilized the working of high frequency DC-DC switching converter...
A simple method for designing and determining the impedance taper of a smooth conical to coaxial transmission line transition is presented. This type of transition is often used in conical line combiners and traditionally has a constant impedance. The presented method allows the conical and coaxial lines to be designed with different impedances and the transition to act as an impedance taper. A conical...
This paper presents an Organic-Light-Emitting-Diode (OLED) equivalent circuit model with temperature coefficient and intrinsic capacitor. In order to precisely describe the OLED non-linear V-I characteristics at different junction temperatures, four parameters: maximum operating point, rated operating point, knee point, and temperature coefficient, are obtained from the OLED V-I curves to establish...
In this paper, the expressions of transient currents and fluxes of an induction machine have been deduced in the case of a three phase short circuit of the supply network. Initial conditions assume that the machine is operating in no-load mode. In order to simplify the problem, the rotor speed is assumed to remain constantly at synchronous speed all over the time interval of interest. The analysis...
We report on multiphysics full-wave techniques in the frequency (energy)-domain and time-domain, aimed at the investigation of the combined electromagnetic-coherent transport problem in nano-structured materials and devices, in particular carbon-based materials/devices. The quantum transport is modeled by i) discrete Hamiltonians at atomistic scale, ii) Schrödinger equation, and/or Dirac/Dirac-like...
The quadratic buck converter or the BUCK converter presents a non-linear dc-dc voltage conversion ratio. The large-signal model of the quadratic buck converter would possess greater number of higher order nonlinear ac terms compared to that of the conventional buck converter. One can gain better insight by considering the linear model to understand the dynamic characteristics of these converters....
The hysteresis in the state-of-charge (SoC) vs. open-circuit voltage characteristic of a lithium-iron-phosphate (LiFeP04, LFP) battery is modelled with two approaches. The first one is based on a first-order charge relaxation equation, the second one is the Preisach model implemented with the Everett function. The advantages and drawbacks of the methods are discussed. Simulation results are compared...
Accurate battery models and precise calculation of the battery state-of-charge (SOC) are necessary for maximizing battery performance, realizing safe operation, and extending the operating range of hybrid electric and plug-in hybrid vehicles. In this paper, by taking various temperatures and charging/discharging current rates into consideration, a comprehensive battery model is developed in which...
Photo-voltaic generators are no longer an energy source mainly useful for off-grid applications, such as satellites. Their presence in the energy mix of developed countries has substantially increased. Moreover, their price downward trend, together with the upward trend of electric energy prices, might increase their role, if allowed by the legal context. The behavior of photo-voltaic generators is...
In this paper, the three-port Ćuk converter interfaces one unidirectional input power port (envisioned to be a DC power source such as PV, or fuel cell) and two bidirectional output ports, representing the grid-tied inverter dc bus and a storage port respectively, and combines all the magnetics into a single core. The well-known property of the basic Ćuk converter that emulates an ideal dc-dc transformer...
Microwave acoustic filters operated at high power levels generate nonlinear mixing products necessitating improved nonlinear modeling. The latest communications protocols place strict limits on such mixing products including the generation of intermodulation distortion products, which desensitize a receiver, as well as second harmonic emissions. We extend the conventional nonlinear acoustic theory...
A structure for active battery balancing with using Multi-Windings Transformer is presented. Most of applications in electrical vehicles need smart voltage control and high effective battery systems. In generally, the battery stack systems consist of these three parts: management, safety and balancing. In these parts, balancing is the most significant part since the management demands to improve the...
This paper presents a new dynamical model of superconducting magnetic energy storage systems (SMESs). The dynamical model is developed based on the equivalent circuit diagram of an SMES which is connected to the power grid through a converter. The switching actions of the converter are also considered within the proposed model. The power balance at the input and output of the converter is taken into...
The paper describes a voltage-behind reactance model of a six-phase induction machine with two different voltage levels realized in the machine, with magnetic saturation and cross-saturation of the main inductance, magnetic and electric coupling between the 6 phases and a possible mechanical displacement between the two 3-phase stator systems. The stator and rotor stray inductances and resistances...
This paper presents a method to model the drain current of LDMOS working in the 3rd quadrant (Vds<0), which is important for power management IC design. The DIBL effect in 3rd quadrant is shown to be much more significant than that in 1st quadrant (Vds>0), and is not captured by the existing LDMOS models. Also, the threshold voltage model is not accurate in 3rd quadrant, where the drain-body...
This paper proposes a design close loop for series resonant converter based on generalized state space averaging modeling for the resonant converter. In addition, this study covers both the steady state analysis and small signal modeling for the series resonant converter, working under zero voltage switching conditions. The proposed closed loop system, which uses PID controller and the Observable...
The design procedure of a PMSM includes employing functional models of the machine which reflect the thermal, electrical and magnetic aspects of the machine. In this paper, the complete process for creation of a physics-based model is presented. The model is employed in the heart of the multi-physics design optimization of a PMSM. The design optimization is accomplished by using a genetic-particle...
Fluid flow in microfluidic channels can be driven by an electeric field or pressure gradient or a combined of these "forces". In this paper, the pressure and potntial distribution in microfluidic channels of a particular integrated micro fluidic device is investigated and The results obtained by numerical simulation were compared with results obtained by circuit modeling. Circuit modeling...
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