Search results for "Current Sensor"

showing 10 items of 22 documents

Total ionizing dose (TID) evaluation of magnetic tunnel junction (MTJ) current sensors

2015

Abstract The paper shows an experimental study to know the behaviour of tunnel magnetoresistive effect-based current sensors configured in a Wheatstone bridge in response to irradiation. In particular the sensitivity, hysteresis, output offset voltage and input resistance are discussed when the sensors are submitted to a total irradiation dose of 43 krad with 36 krad/h dose rate. The same electrical parameters were studied subsequently once the irradiated sensors were submitted to an 80 °C annealing process. The studied TMR sensors are applied in a switched-mode power converter for space application.

Wheatstone bridgeMaterials scienceInput offset voltageMagnetoresistanceAnnealing (metallurgy)business.industryMetals and AlloysElectrical engineeringCondensed Matter PhysicsSurfaces Coatings and FilmsElectronic Optical and Magnetic Materialslaw.inventionTunnel magnetoresistancelawAbsorbed doseOptoelectronicsCurrent sensorIrradiationElectrical and Electronic EngineeringbusinessInstrumentationSensors and Actuators A: Physical
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Spin-valve current sensor for industrial applications

2003

This work presents an industrial application of a new spin-valve current sensor based on the giant magnetoresistance effect (GMR) and provides a comparison between this sensor and the typical sensor used in these applications, the hall sensor. Experimental results derived from the application of this two sensors in a power application (a bi-directional three-phase rectifier) are shown.

Three phase rectifierChemistrybusiness.industryMetals and AlloysSpin valveElectrical engineeringPower applicationGiant magnetoresistanceCondensed Matter PhysicsSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsRectifierHall effect sensorCurrent sensorElectrical and Electronic EngineeringbusinessInstrumentationSensors and Actuators A: Physical
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<title>Modeling of eddy current sensors</title>

2001

In this paper two models of eddy current sensor have been presented. They are base don a one- and multi-turn coil model. The results of computer simulations present a relation of eddy current density on nonferromagnetic conducting materials versus some parameters viz: a coil radius, frequency of excitation current and conductivity of material.© (2001) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

EngineeringEddy-current sensorbusiness.industryOptical engineeringAcousticsBase (geometry)Electrical engineeringRadiusConductivitylaw.inventionExcitation currentElectromagnetic coillawEddy currentbusinessSPIE Proceedings
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Quasi-static magnetoresistive sensor modeling for current-time conversion circuit applications

2011

In this paper we report a current-to-time converter (CTC) suitable for current sensor monitoring in low power applications. Based on a discrete resistence-to-frequency converter and a Giant MagnetoResistance (GMR) current sensor. Simulations have been done using a quasi-static electrical Verilog-A model for the GMR current sensor. A reduced set of parameters has been extracted to characterize the GMR sensor's behavior. The application has been analyzed making use of different sensors, whose device parameters were previously extracted. Finally, the accuracy of the models has been tested by comparing with experimental transient measurements.

Materials scienceMagnetoresistancebusiness.industryLow-power electronicsElectronic engineeringElectrical engineeringGiant magnetoresistanceCurrent sensorTransient (oscillation)businessDevice parametersQuasistatic processPower (physics)Proceedings of the 8th Spanish Conference on Electron Devices, CDE'2011
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Electrical Characterization of a Magnetic Tunnel Junction Current Sensor for Industrial Applications

2012

The objective of the work was the design of a Wheatstone bridge current sensor using MTJ as magnetoresistive elements. Each one of the four resistances of the bridge consists on 360 MTJ single elements connected in series for improved electrical robustness. A printed circuit board (PCB) was designed with a U-shaped copper trace placed under the PCB maintaining a 1.1 mm separation distance between sensor and trace. A 160% of tunnel magnetoresistance effect in the single junction and a 120% in its corresponding series elements connection has been achieved with a sensitivity of 9.2 Ω/Oe in a 65 Oe linear range. The DC sensor sensitivity in response to an external DC current sweeps of ±10, ±20,…

Wheatstone bridgeMaterials scienceMagnetoresistancebusiness.industryElectronic Optical and Magnetic Materialslaw.inventionTunnel magnetoresistancePrinted circuit boardLinear rangelawOptoelectronicsCurrent sensorElectrical and Electronic EngineeringbusinessFiber optic current sensorTemperature coefficientIEEE Transactions on Magnetics
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Topology design to reduce energy consumption of distributed graph filtering in WSN

2017

The large number of nodes forming current sensor networks has made essential to introduce distributed mechanisms in many traditional applications. In the emerging field of graph signal processing, the distributed mechanism of information potentials constitutes a distributed graph filtering process that can be used to solve many different problems. An important limitation of this algorithm is that it is inherently iterative, which implies that the nodes incur in a repeated communication cost along the exchange periods of the filtering process. Since sensor nodes are battery powered and radio communications are one of the most energy demanding operations, in this work, we propose to redesign …

Radio communicationsComputer scienceDistributed computing05 social sciences050801 communication & media studies020206 networking & telecommunicationsTopology design02 engineering and technologyEnergy consumptionNetwork topology0508 media and communicationsDistributed algorithm0202 electrical engineering electronic engineering information engineeringGraph (abstract data type)Current sensorWireless sensor network
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A tunnel magnetoresistive effect wattmeters-based wireless sensors network

2017

Abstract In the present work a wireless sensors network (WSN) for smart energy metering is presented using the ZigBee protocol as the communication link. Each network node process the electrical power by means of a Wheatstone bridge sensor based on the tunnel magnetoresistive (TMR) effect working as analogue multiplier. The electrical power is acquired and processed by a digital signal processor that extracts various parameters of interest like current and voltage load, active power and power factor by means of Fourier analysis. All the obtained electrical parameters at each node are served and shown in a web page that can be easily accessed by authorized users.

EngineeringWheatstone bridge02 engineering and technologyPower factor01 natural scienceslaw.inventionlaw0103 physical sciencesElectronic engineeringCurrent sensorElectrical and Electronic EngineeringInstrumentation010302 applied physicsbusiness.industryNode (networking)Metals and AlloysElectrical engineeringWattmeterAC power021001 nanoscience & nanotechnologyCondensed Matter PhysicsSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsSensor node0210 nano-technologybusinessWireless sensor networkSensors and Actuators A: Physical
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GMR Based Sensors for IC Current Monitoring

2013

The Giant MagnetoResistance (GMR) effect is a magnetic coupling mechanism that can be obtained in multilayer structures of few nanometers thick. In these devices, and at room temperature, the resistance is a function of the external magnetic field, at optimal levels for being used as sensors. Since the GMR effect was reported, scientists and engineers have dedicated their effort to this topic. This way, after two decades, a a very good knowledge of the GMR underlying physics together with notable designs of GMR based devices are nowadays available. They were initially used in the read heads of hard drives, but the constant evolution that this technology has experienced has open new fields o…

Wheatstone bridgeMaterials sciencebusiness.industrySpin valveGiant magnetoresistanceEngineering physicsInductive couplingMagnetic fieldlaw.inventionlawMicroelectronicsCurrent sensorCurrent (fluid)business
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Electrical ammeter based on spin-valve sensor.

2012

The present work shows an electrical ammeter for laboratory purpose based on a magnetoresistive (MR) spin-valve (SV) sensor. The proposed ammeter measures a 10 A maximum current and offers a maximum frequency response between 150 and 800 kHz depending on the electronics whole gain. These features are due to the use of a new generation MR-SV current sensor and a conditioning electronics that compensates in frequency and temperature the sensor response. With little adjustments in the electronics and changing the position of the sensor with respect to current carrying conductor, the designed instrument is able to measure higher current levels. The work shows the proposed ammeter with its diffe…

Frequency responsebusiness.industryComputer scienceAmmeterElectrical engineeringSpin valveMeasure (physics)Current sensorElectronicsCurrent (fluid)businessInstrumentationConductorThe Review of scientific instruments
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Magnetic Field Sensors Based on Giant Magnetoresistance (GMR) Technology: Applications in Electrical Current Sensing

2009

The 2007 Nobel Prize in Physics can be understood as a global recognition to the rapid development of the Giant Magnetoresistance (GMR), from both the physics and engineering points of view. Behind the utilization of GMR structures as read heads for massive storage magnetic hard disks, important applications as solid state magnetic sensors have emerged. Low cost, compatibility with standard CMOS technologies and high sensitivity are common advantages of these sensors. This way, they have been successfully applied in a lot different environments. In this work, we are trying to collect the Spanish contributions to the progress of the research related to the GMR based sensors covering, among o…

EngineeringSensing applicationsbusiness.industryElectrical engineeringSolid-stateGiant magnetoresistanceReviewlcsh:Chemical technologyBiochemistryAtomic and Molecular Physics and OpticsAnalytical ChemistryMagnetic fieldmagnetic field sensorsElectrical currentphysical sensorsCMOSlcsh:TP1-1185Electrical and Electronic Engineeringgiant magnetoresistancebusinessInstrumentationcurrent sensorsSensors (Basel, Switzerland)
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