Search results for " Elettroni"

showing 10 items of 1073 documents

A PC-based wattmeter for accurate measurements in sinusoidal and distorted conditions: Setup and experimental characterization

2012

This paper presents the development of a high-accuracy sampling wattmeter, which can be employed with both sinusoidal and distorted input signals. The proposed personal computer (PC)-based system is a simple, portable, and low-cost solution because it is based on two commercial data acquisition boards connected to a common PC. Owing to this solution, the voltage is sensed directly, avoiding expensive voltage dividers, while the current is sensed by means of a noninductive current shunt. Commercial software is also used for data processing and implementation of the virtual instrument. The setup of the PC-based wattmeter is described, with a detailed description of the correction strategy of …

EngineeringVirtual instrumentExperimental evaluationMeasurement uncertaintyNon-inductive currentsInput signalHarmonic distortionElectric power measurementlaw.inventionPC-basedData acquisitionlawExperimental testElectronic engineeringData acquisition harmonic distortion personal computer (PC) -based instrument power measurement power system measurements wattmetersElectrical and Electronic EngineeringSignal samplingInstrumentationVoltage dividersTotal harmonic distortionLow-cost solutionVirtual instrumentationbusiness.industryAnalog to digital convertersData acquisition boardExperimental characterizationVoltage dividerElectrical engineeringData acquisitionMetrological performanceWattmeterAccurate measurementCommercial softwareElectric powerPersonal computersPower qualityPersonal computerPower system measurementMeasurement uncertaintyUncertainty analysisbusinessHigh-accuracySettore ING-INF/07 - Misure Elettriche E ElettronicheWattmetersVoltage
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Virtual Instruments: Uncertainty Evaluation in the Presence of Electromagnetic Interferences

2007

The electromagnetic interferences can influence the performances of a virtual instrument; consequently, in a generic measurement performed by using these instruments, the related uncertainty values can increase. In the paper, we report the results of various experimental tests performed with the aim to check if and how the radiated and/or conducted disturbances affect the instruments' characteristics and, in particular, the single uncertainty sources. Starting from these results and applying an already proposed method for the uncertainty estimation in the measurements performed by means of virtual instruments, it is possible to take into account and to evaluate the contribute of the electro…

EngineeringVirtual instrumentationbusiness.industryElectromagnetic compatibilityVirtual InstrumentsimmunityVirtual instrumentElectromagnetic interferenceData acquisitionUncertainty estimationEMCUncertainty EstimationMeasurement uncertaintyElectromagnetic ImmunitybusinessSettore ING-INF/07 - Misure Elettriche E ElettronicheSimulationUncertainty analysis2007 IEEE International Workshop on Advanced Methods for Uncertainty Estimation in Measurement
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A Novel Wireless Sensor Network for Electric Power Metering

2015

Wireless sensor network with lightweight and efficient communication infrastructures are today a great interest, both at research and industrial level, as they are the basis for reliable monitoring services. Mesh networks are ideal candidates in this scenario, as they can be very fault-tolerant. After introducing wireless network systems requirements, we show the design of a mesh network routing protocol based on AODV schemas. Its implementation runs on top of low-cost off-the-shelf components, and allowed us to build a custom power meter wireless sensor node.

EngineeringWireless mesh networkbusiness.industryWireless networkComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSMesh networkingWireless WANOrder One Network ProtocolMicrocontroller power metering wireless sensorSettore ING-INF/01 - ElettronicaKey distribution in wireless sensor networksMobile wireless sensor networkbusinessWireless sensor networkComputer network
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Arc Fault Detection Method Based on CZT Low-Frequency Harmonic Current Analysis

2017

This paper presents a method for the detection of series arc faults in electrical circuits, which has been developed starting from an experimental characterization of the arc fault phenomenon and an arcing current study in several test conditions. Starting from this, the authors have found that is it possible to suitably detect arc faults by means of a high-resolution low-frequency harmonic analysis of current signal, based on chirp zeta transform, and a proper set of indicators. The proposed method effectiveness is shown by means of experimental tests, which were carried in both arcing and nonarcing conditions and in the presence of different loads, chosen according to the UL 1699 standard…

Engineeringarc fault detection020209 energyseries arcsArc-fault circuit interrupter02 engineering and technologyUL 1699Fault detection and isolationlaw.inventionHarmonic analysisElectric arcarc fault circuit interrupter (AFCI)Arc dischargeslawArc discharges arc fault circuit interrupter (AFCI) arc fault detection electrical safety fault diagnosis home protection interrupters power system harmonics power system measurements series arcs UL 1699Fault current limiterhome protection0202 electrical engineering electronic engineering information engineeringElectronic engineeringElectrical and Electronic EngineeringInstrumentationpower system harmonicsinterruptersbusiness.industry020208 electrical & electronic engineeringfault diagnosispower system measurementsFault indicatorElectrical networkHarmonicelectrical safetybusinessSettore ING-INF/07 - Misure Elettriche E Elettroniche
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Baseband predistorter using direct spline computation

2005

A baseband predistorter is presented. Key features of the predistorter reside in the use of cubic spline interpolation to generate predistorted input data to the power amplifier, without time convergence problems of classical approaches, with the goal of a reduction in the computational effort. Simulated behaviour of the proposed scheme is presented, demonstrating the effectiveness of the approach.

Engineeringbusiness.industryComputationAmplifierTransmitterSettore ING-INF/01 - ElettronicaSpline (mathematics)Rate of convergenceLinearizerBasebandElectronic engineeringElectrical and Electronic EngineeringbusinessSpline interpolationPredistorter baseband linearizer power amplifier spline
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Reconfigurable digital instrumentation based on FPGA

2004

A novel application of FPGA to realize digital test equipment is proposed. It takes advantage of the dynamic reconfigurability of FPGAs so easily tailoring custom test functions in the same instrument. This results in high effective, compact and low cost instruments.

Engineeringbusiness.industryDigital instrumentationReconfigurabilityIntegrated circuit designFPGA reconfigurable systems instrumentationSettore ING-INF/01 - ElettronicaProgrammable logic arrayReconfigurable computingProgrammable logic deviceAutomatic test equipmentEmbedded systemHardware_ARITHMETICANDLOGICSTRUCTURESbusinessField-programmable gate array
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A fuel cell-battery hybrid power supply for portable applications

2010

Today, academic and industrial research is addressed to fuel cell based hybrid power supply in many fields of applications including stationary, automotive and portable electronics. Increasing source runtime, speeding up the transient response while minimizing weight, volume and cost of the power supply system are key requirements of all applications. According to the particular application, the power management system is optimized for a specific feature. In this paper, a fuel cell–battery hybrid power supply for a Digital Camera is proposed, although the control algorithm can be efficiently applied to any portable device. Thanks to an innovative control on the input power, any fuel cell pr…

Engineeringbusiness.industryElectrical engineeringAutomotive industryAutomotive electronicsSettore ING-INF/01 - ElettronicaPower electronicsControl systemfuel cell hybrid power supplyTransient responseHybrid powerSwitched-mode power supply applicationsbusinessPower management system
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A Phase-Locked Loop for the Synchronization of Power Quality Instruments in the Presence of Stationary and Transient Disturbances

2007

Power quality instrumentation requires accurate fundamental frequency estimation and signal synchronization, even in the presence of both stationary and transient disturbances. In this paper, the authors present a synchronization technique for power quality instruments based on a single-phase software phase-locked loop (PLL), which is able to perform the synchronization, even in the presence of such disturbances. Moreover, PLL is able to detect the occurrence of a transient disturbance. To evaluate if and how the synchronization technique is adversely affected by the application of stationary and transient disturbing influences, appropriate testing conditions have been developed, taking int…

Engineeringbusiness.industryFundamental frequencySignalSynchronizationPhase-locked loopTransducerInstrument synchronization phase-locked loop (PLL) control power quality transient disturbancesControl theoryElectronic engineeringInstrumentation (computer programming)Transient (oscillation)Electrical and Electronic EngineeringbusinessSettore ING-INF/07 - Misure Elettriche E ElettronicheInstrumentationVoltageIEEE Transactions on Instrumentation and Measurement
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Impact of industrial environments on the PC-based measurements

2007

In the paper we present a simple and fast procedure to evaluate the impact of the electromagnetic disturbances, which can be present in the industrial locations, on the measurements performed by a generic PC-based measurement instrument. The method is conceived starting from the data obtained by subjecting the instruments to the disturbances prescribed by the IEC-61326 standard. The results show that, even under heavy disturbances, the common good practices of shielding and grounding allow a correct employment of this kind of instrumentation.

Engineeringbusiness.industryGroundimmunitàElectromagnetic compatibilityElectromagnetic interferenceData acquisitionElectromagnetic shieldingEMCElectronic engineeringInstrumentation (computer programming)Radio frequencybusinessImmunity TestingSettore ING-INF/07 - Misure Elettriche E Elettronicheelectromagnetic compatibility data acquisition system instrument characterizationSimulation
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Power tracking with maximum efficiency for wireless charging of E-bikes

2014

Wireless charging techniques, based on Inductive Power Transfer (IPT), are attractive for Electric Vehicles (EV), due to benefits such as convenience and safety. An accurate valuation of the maximum achievable efficiency in an IPT system is extremely unlikely due to the high sensitivity to parasitic elements variations. Therefore, an “on site” procedure of power efficiency characterization is useful to get a precise description of the efficiency curve and obtain the actual maximum efficiency. In this paper, a power tracking algorithm aiming at efficiency maximization is proposed for a Wireless Charging system. The algorithm aims at finding the maximum power transfer efficiency with respect …

Engineeringbusiness.industryInductive power transfer wireless battery charging power flow control power tracking maximum efficiencyControl variableMaximizationSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciSettore ING-INF/01 - ElettronicaMaximum power point trackingMaximum efficiencyElectronic engineeringMaximum power transfer theoremWirelessbusinessElectrical efficiencyPower control2014 IEEE International Electric Vehicle Conference (IEVC)
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