A new closed-loop magnetic current sensor is presented in this paper. The consists of two toroidal cores. One core works fluxgate principle for the measurement dc and low-frequency ac, other one used as a transformer higher frequency application. Based on simulation results, prototype was designed, test results have good agreement with results. configuration feedback winding improved sensitivity sensor, eliminated offset drift related to temperature, greatly reduced error caused by...

This paper presents a novel current sensor, which includes giant magnetoresistance (GMR) chip, toroidal magnetic core, and feedback winding on the core. The mathematical model of sensor was built, used to analyze influence factors closed-loop sensor. configuration with core improved sensitivity eliminated offset drift related temperature greatly reduced error caused by hysteresis phenomenon. simulation test results showed that has very low linear (less than ± 0.7%). designed can measure...

Optimizing the number and spatial distribution of emergency facilities is paramount importance in minimizing rescue response times thus loss life property. This study proposes a novel integrated two-stage stochastic integer model to optimize allocation facilities, including hospitals, fire stations, shelters. The first stage minimize expected travel given uncertainties road network conditions human mobility, where time computed from second for each situation slot. To address computational...

This paper presents the analysis and design procedure of a voltage equalizer, which consists boost full-bridge input cell symmetrical multiplier (SVM). The batteries under different initial conditions can be charged to desired uniform level by proposed equalizer. fundamental operation principle equalizer is described, dc equivalent resistance model derived analyze charging equalization behaviors. based on analytical models presented give optimal parameter configuration for reduce imbalance...

When a transformer is de-energized, the magnetic core material will contain certain amount of residual flux. This flux may intensify saturation and lead to high transient in-rush current upon remagnetizing. paper describes novel method for analyzing detecting flux, based on nonlinear magnetizing characteristics (also called Φ- I characteristics) core. A model toroidal was built simulate transients, which takes process initial energization nonloaded into consideration. The relationship...

This paper presents a new electromagnetic vibration-powered generator. The input-output mathematical model of an axial magnetization annular permanent magnet spring is built. Taking advantage the model, characteristic curve magnetic force versus displacement obtained. Wires were wound both inside and outside to form inner coil outer coil, respectively. force, natural frequency, output voltage waveforms field distribution designed generator have been simulated using Finite Element method...

Conventional energy storage systems include a bidirectional converter for charging and discharging the series-connected cells separate voltage equalizer. In this article, to simplify system, equalizer is integrated into system. Only one magnetic component required in proposed architecture, more importantly, no longer needs as driver. The composed of symmetrical multiplier (SVM) series-resonant circuit. operates discontinuous conduction mode (DCM) can provide constant equalization current...

This paper presents a compact current sensor for the measurement of ac and dc. The consists two toroidal magnetic cores. One core works in fluxgate principle to measure dc low-frequency ac, other one is used as transformer higher frequency application. closed-loop configuration with feedback winding improved sensitivity sensor, eliminated offset drift related temperature, greatly reduced error caused by hysteresis phenomenon. It can currents up 20 A, has an accuracy 0.7% ~30-kHz bandwidth.

As giant magneto resistive (GMR) effect based current sensors are susceptive to stray magnetic fields, this paper proposes a GMR sensor with shielding. Magnetic shielding effectiveness and gain coefficient of the analyzed by finite element method (FEM), some concerned parameters affecting effects also discussed. In order achieve accurate measurement for ac dc, proposed two methods providing bias field. One is using coil winding other permanent magnet. Based on theoretical analysis simulation...

This paper describes the 3-D eddy current FEM computation of transverse flux inductors used for heating strip in galvanized steel production. The adopted mathematical model consists a differential equation system steady-state problem and Fourier thermal conduction moved media. finite element method is applied conjunction with Galerkin method. simplifications boundary conditions required an efficient solution are discussed.

This paper presents a power-converter model intended for balanced and unbalanced radial power-flow studies. A three-phase steady-state of power converter (AC/DC-DC/AC) composed diode rectifier, lossless DC link, pulse-width-modulated inverter is presented. Both the rectifier are modeled as three, equivalent, Y-connected single-phase rectifiers inverters, respectively. The implemented within solver with phase representation. Simulation results on an 15-bus system

This paper presents a new hybrid piezoelectric-electromagnetic vibration-powered generator (HPVG). An electromagnetic and piezoelectric are combined as an integrated HPVG. input-output mathematical model describing the coupling of mechanical filed, electrical field, magnetic field in HPVG is presented. The resonant frequency, output voltage waveforms, power have been studied. has much higher compared with single or same dimension.

A new fluxgate current sensor is presented in this paper. The consists of an additional magnetic toroidal core and winding, aside from the elements a traditional sensor. In addition, exciting winding wound along circumference to decouple field feedback order reduce internal interference. With proposed can extend its bandwidth medium- high-frequency ac measurement. Another purpose introducing concentrate on interference external disturbances. prototype was designed tested. Test results show...

This article presents the analysis and design considerations of a phase shift full-bridge converter with new simple reliable passive auxiliary circuit for zero-voltage switching (ZVS) operation. The steady-state behavior is analyzed in detail. contribution energy stored to both leakage inductance considered ZVS condition, current adjustment ability rms circulating are described, impacts narrow frequency variation on analyzed. procedures based analytical models considering angle input voltage...

At Drexel University, instrumentation and measurement of the reconfigurable distribution automation control laboratory include hardware software instruments which together form an automated system. This system contains special features that were included to enable meter placement network reconfiguration studies. paper presents outline for general then focuses on capabilities purposely added

Electrical capacitance tomography (ECT) image reconstruction is a typical ill-posed problem. Successful applications of ECT depend greatly on the precision and speed algorithms. In this paper, an method based RBF Neural Network proposed. Using measurement data obtained from simulation software developed, reconstructed images were obtained. The proposed was verified through flow patters reconstruction. results show that effective approach to solve for ECT, which faster more accurate compared...

This paper presents a new current sensor based on fluxgate principle. The consists of U-shaped magnetic gathering shell. In the designed sensor, exciting winding and secondary are arranged orthogonally, so that fields produced by two windings mutually orthogonal decoupled. Introducing shell into is to concentrate detected field reduce interference an external stray field. Based theoretical analysis simulation results, prototype was designed. Test results show proposed can measure currents up...

The Dedicated Bus Lane (DBL) is often adopted to ensure transit priority. This because priority can effectively mitigate congestion at the signalized intersection. However, DBL would cause heavy sacrifices from general vehicles when frequency of buses low. To address this issue, many studies were proposed reduce vehicles’ sacrifice by converting DBLs into Bus‐Priority Lanes (BPLs). Such BPLs be intermittently open vehicles. these cannot absolute access BPLs. With advance Connected Automated...

This paper presents a new dual-core closed-loop flux gate current sensor. The mathematical model was built, and the parameters that affect characteristics of sensor were analyzed. effects structural on output simulated. Based simulation results, prototype designed, test results have good agreement with results. has advantages ultra low nonlinear error ( ± 3‰) offset error. noise in primary is eliminated when measuring dc or ac signal. Especially, designed can measure up to 20 kHz nominal value 30 A.

Bus priority, as an effective way to alleviate congestion. To do this, most existing strategies design a dedicated lane or road space for buses. However, the can easily cause wastage of space. save space, strategy is proposed and makes bus priority open general vehicles. The calls such Mixed-use Priority Lane (MBPL). challenge protect buses from being interfered with by vehicles while permitting enter MBPL. overcome challenge, cuts MBPL into several spatial slices at each moment. Spatial on...

This paper presents a new electromagnetic vibration-powered generator. In the generator, moving mass has sandwich structure, consisting of two axially magnetized annular permanent magnets and one soft magnetic "pole piece." The purpose using pole is to increase effective flux linkage generator output voltage makes use "magnetic spring," which gives advantages such as ease construction, tenability, less prone fatigue opposed mechanical spring. mathematical model was built. field distribution...