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509results about "Measurement using dc-ac conversion" patented technology
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Low cost millimeter wave imager
InactiveUS7583074B1Low costUseful sensitivity levelMeasurement using dc-ac conversionMeasurement using ac-dc conversionLow noiseTunnel diode
Low cost millimeter wave imagers using two-dimensional focal plane arrays based on backward tunneling diode (BTD) detectors. Two-dimensional focal arrays of BTD detectors are used as focal plane arrays in imagers. High responsivity of BTD detectors near zero bias results in low noise detectors that alleviate the need for expensive and heat generating low noise amplifiers or Dicke switches in the imager. BTD detectors are installed on a printed circuit board using flip chip packaging technology and horn antennas direct the waves toward the flip chip including the BTD detectors. The assembly of the horn antennas, flip chips, printed circuit board substrate, and interconnects together work as an imaging sensor. Corrugated surfaces of the components prevent re-radiation of the incident waves.
Owner:HRL LAB
Current sensor
ActiveUS20050156587A1Reduce weightMeasurement accuracyMeasurement using dc-ac conversionMachines/enginesElectrical conductorCurrent sensor
A current sensor is described that uses a plurality of magnetic field sensors positioned around a current carrying conductor. The sensor can be hinged to allow clamping to a conductor. The current sensor provides high measurement accuracy for both DC and AC currents, and is substantially immune to the effects of temperature, conductor position, nearby current carrying conductors and aging.
Owner:THE UNITED STATES AS REPRESENTED BY THE DEPARTMENT OF ENERGY
Integrated sensor
ActiveUS7259545B2Measurement using dc-ac conversionMagnetic measurementsResistive couplingElectrical resistance and conductance
Owner:ALLEGRO MICROSYSTEMS INC
Power line property measurement devices and power line fault location methods, devices and systems
InactiveUS20050040809A1Improve securityQuick and efficientMeasurement using dc-ac conversionElectric lighting sourcesMeasurement deviceDistribution power system
A device for use in locating a fault on a power line of a power distribution system includes: at least one sensor for measuring at least one property of the power line, and at least one output device in operative connection with the sensor to signal a state of the power line. The signaled state of the power line is determined from the measured property and indicates whether a fault has occurred in the power line. The output device can, for example, signal a current state or a previous state of the power line. The device can further include a controller in operative connection with the output device to control the operation of the output device based upon at least one of the current state or the past state of the power line. A device for use in measuring a property of power line of a power distribution system includes: a connector adapted to place the device in operative connection with the power line in the power distribution system without taking the power line out of operation; a sensor for measuring a property of the power line, and an output device in operative connection with the sensor to transmit a signal representative of the measured property.
Owner:UBER ARTHUR E III +1
Multi-substrate integrated sensor
InactiveUS7518354B2Measurement using dc-ac conversionMagnetic measurementsElectrical conductorTransducer
Owner:ALLEGRO MICROSYSTEMS INC
Method and apparatus for determining a corrected monitoring voltage
ActiveUS20100195357A1Conversion with intermediate conversion to dcMachines/enginesComputing systemsVoltage
A method and apparatus for determining a corrected monitoring voltage, at least a portion of the method being performed by a computing system comprising at least one processor. The method comprises generating power at a first location; monitoring the generated power by measuring a first voltage proximate the first location; measuring a second voltage proximate a second location, the first and the second locations electrically coupled; and determining, based on the measured second voltage, a corrected monitoring voltage to compensate the measured first voltage for a distance between the first and the second locations.
Owner:ENPHASE ENERGY
Current sensor
InactiveUS7166807B2Measurement using dc-ac conversionSemiconductor/solid-state device detailsElectrical conductorCurrent sensor
Owner:ALLEGRO MICROSYSTEMS INC
Method and apparatus for establishing low frequency/ultra low frequency and very low frequency communications
InactiveUS8299936B2Increase signal strengthShorten speedElectric signal transmission systemsDirection finders using radio wavesIonosphereElectromagnetic pulse
A method for generating electromagnetic waves in the ELF / ULF comprising the steps of using a ground-based Horizontal Electric Dipole (HED) antenna to send electromagnetic pulses upwardly in the E-region of the ionosphere to form an oscillatory or pulsed electric field; allowing said pulsed electric field to interact with magnetized plasma of the lower ionosphere to generate a pulsed horizontal and vertical current which have associated Horizontal and Vertical Electric Dipole moment; and allowing them to radiate.
Owner:BAE SYST INFORMATION & ELECTRONICS SYST INTERGRATION INC
Apparatus for sensing current
InactiveUS6963195B1Measurement using dc-ac conversionMagnetic measurementsElectrical conductorCurrent sensor
A current sensor assembly includes a sensor coil, an electrostatic shield coil, a core, a housing, and a magnetic shield. The sensing coil, electrostatic shield coil, core, housing, and magnetic shield can be of toroidal symmetry and arranged coaxially about a pair of primary current conductors. The conductors can be either asymmetric or symmetric with respect to the geometric center of the remaining sensor assembly. The core and a secondary winding make up a current sensor. The core is cylindrically shaped and fabricated of non-magnetic material. The secondary winding is wound over the cylindrical core to form a toroidally shaped winding. When assembled into the current sensor assembly, the core and windings are disposed around two single turn primary windings through which AC currents to be measured flow. Alternatively, the conductor can be flat and the sensor can be a solid state sensor that includes an electrostatic shield. The conductor can have a magnetic flux concentrator positioned about the conductor in the same region where the sensor is located.
Owner:ABB SPA
Current sensor
InactiveUS6995315B2High sensitivityMeasurement using dc-ac conversionSemiconductor/solid-state device detailsElectrical conductorCurrent sensor
An integrated circuit current sensor includes a lead frame having at least two leads coupled to provide a current conductor portion, and substrate having a first surface in which is disposed one or more magnetic field transducers, with the first surface being proximate the current conductor portion and a second surface distal from the current conductor portion. In one particular embodiment, the substrate is disposed having the first surface of the substrate above the current conductor portion and the second surface of the substrate above the first surface. In this particular embodiment, the substrate is oriented upside-down in the integrated circuit relative to a conventional orientation. A current conductor portion can be deposited on a surface of the substrate proximate to the one or more magnetic field sensors. With this arrangement, a current sensor is provided for which the one or more magnetic field transducers are very close to the current conductor portion, resulting in a current sensor having improved sensitivity.
Owner:ALLEGRO MICROSYSTEMS INC
Current sensor
ActiveUS7164263B2Revenue accuracy measurementsMeasurement using dc-ac conversionMagnetic measurementsElectrical conductorCurrent sensor
A current sensor is described that uses a plurality of magnetic field sensors positioned around a current carrying conductor. The sensor can be hinged to allow clamping to a conductor. The current sensor provides high measurement accuracy for both DC and AC currents, and is substantially immune to the effects of temperature, conductor position, nearby current carrying conductors and aging.
Owner:THE UNITED STATES AS REPRESENTED BY THE DEPARTMENT OF ENERGY
Current Measuring Apparatus
ActiveUS20090121704A1Adverse effect of currentReduce adverse effectsMeasurement using dc-ac conversionVoltage/current isolationElectricityHall element
The present invention provides a current measuring apparatus having an improved structure to inhibit the possible adverse effect of a current in a different phase and the possible generation of an induced electromotive force caused by a measurement target current, enabling the measurement target current to be accurately detected even with the small size of the apparatus. The current measuring apparatus includes a printed circuit board 1 having Hall elements 2a, 2b and a signal processing integrated circuit 3 mounted thereon, the Hall elements 2a, 2b sensing a magnetic field generated by a current flowing through a current measurement target bus bar 4a, the signal processing integrated circuit 3 processing sensing outputs from the Hall elements 2a, 2b to calculate a value for the current flowing through the bus bar 4a. Magnetic sensing surfaces of the Hall elements 2a, 2b are arranged substantially perpendicularly to the direction of the magnetic field generated by the current flowing through the bus bar 4a. Further, the printed circuit board 1 is fixed to the bus bar 4a so that a circuit board surface of the printed circuit board 1 having a wire electrically connecting the Hall elements 2a, 2b to the signal processing integrated circuit 3 is positioned substantially parallel to the direction of the magnetic field.
Owner:ASAHI KASEI ELECTRONICS CO LTD
Alternator tester
An alternator tester is provided for testing an alternator of a vehicle while the alternator is coupled to the vehicle. A sensor is configured to couple to the vehicle and sense a signal related to operation of the alternator. A memory contains data related to operator instructions for performing an alternator tester of a function of vehicle type. A processor configured to provide an output indication of alternator condition based upon the sensed signal. An extra load or connection can be provided for coupling to the electrical system.
Owner:MIDTRONICS
Current sensor
ActiveUS20070090825A1DistanceAvoid interactionMeasurement using dc-ac conversionSolid-state devicesElectrical resistance and conductanceElectrical conductor
The present invention provides a current sensor of smaller and simpler configuration, capable of measuring a current to be detected with high precision and stability. A current sensor has a V-shaped conductor line and a pair of magnetoresistive elements disposed along with the conductor line so that a resistance value of one of the magnetoresistive elements changes in a direction opposite to that of resistance-value-change of the other magnetoresistive element according to current magnetic fields produced by a current to be detected flowing through the conductor line.
Owner:TDK CORPARATION
High-precision rogowski current transformer
ActiveUS20080079418A1Increase the number of lapsLow reliabilityMeasurement using dc-ac conversionVoltage/current isolationEngineeringPrinted circuit board
A high-precision Rogowski current transformer, the Rogowski coil is realized in a single printed circuit board while maintaining both the outside field rejection of a traditional Rogowski coil, and the increased output voltage similar to the multiple printed circuit board Rogowski coil arrangements.
Owner:GM GLOBAL TECH OPERATIONS LLC
Aging status diagnostic apparatus for power conversion system, and method their of
InactiveUS20100161259A1Easy to installAchieve reliabilityEmergency protective circuit arrangementsCapacitor testingPower inverterHarmonic
The present invention relates to an apparatus capable of diagnosing the aging state of a power conversion system at ordinary times and its diagnosing method to ensure the reliability of a power conversion system. The apparatus includes a current sensing means for detecting the output current of a inverter switching module or an electrolytic capacitor, and measurement and diagnosis means for extracting elements related to the aging status of the power conversion system by receiving the output current waveform of the inverter switching module and magnitude of each harmonic or an impedance voltage signal of the electrolytic capacitor. Furthermore, it is preferable that the apparatus further includes a measurement current generation means for generating measurement current to be supplied to the electrolytic capacitor. By analyzing an average value or the magnitude of harmonics by FFT analysis of the output current waveform of the inverter switching module and measuring an ESR value or a loss angle tan δ of a DC bus of the power conversion system, the present invention is able to monitor and diagnose the abnormal state attributable to the aging or degradation of the power conversion system in advance.
Owner:POWERTRON ENG
Near field probe
InactiveUS6940264B2Improve reliabilityReduce outputMeasurement using dc-ac conversionElectric devicesSystem under testElectromagnetic radiation
A near field probe for testing installed components of an electromagnetic radiating system on a missile. The probe design comprises a diode antenna with a balun. The probe utilizes a dual diode arrangement which provides approximately twice the output voltage as the previous probe. The probe may then be placed further away from the radiating system under test.
Owner:THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY
High precision current sensor
InactiveUS20060043960A1Accurate measurementHigh currentMeasurement using dc-ac conversionMagnetic measurementsCurrent sensorMagnetic flux
A current sensor for measuring an electric current flowing through a current bus bar includes: a magnetic core with an opening, through which the current bus bar passes with a predetermined interval; and a first magnetic sensor for detecting magnetic flux density in the magnetic core, the magnetic flux density generated by the electric current passing through the current bas bar. The magnetic core has a first gap and a second gap. The first magnetic sensor is disposed in the first gap. The second gap is capable of preventing magnetic saturation of the magnetic core.
Owner:DENSO CORP
Current sensor arrangement
ActiveUS7253603B2Precise positioningEasy to correctMeasurement using dc-ac conversionVoltage/current isolationElectrical conductorCurrent sensor
A current sensor is provided including a Rogowski coil in an assembly that is easily positioned about a conductor, e.g. without cutting the line or deenergizing the line. In one arrangement, the Rogowski coil is formed about a split helical structure such that the ends of the Rogowski coil are not coincident. While this does introduce a small error in the current measurement, this small error is easily correctable by calibration and / or application software. The current sensor includes suitable insulation such that it can be placed about energized, high-voltage lines.
Owner:S&C ELECTRIC
Current detector
InactiveUS6459255B1Inexpensive currentExclude influenceMeasurement using dc-ac conversionMagnetic measurementsElectrical conductorHall element
A current detector having a linear conductor 111, 112, a linear to-be measured conductor 10 disposed substantially in parallel to the conductor 111, 112 and through which a to-be measured current flows. A Hall element 20 disposed in the vicinity of the to-be measured conductor 10 such that a magnetic flux generated by the to-be measured current flowing through the to-be measured conductor 10 enter into a magnetic-force sensing face 21 substantially perpendicularly. A substrate 30 for supporting the conductor and the to-be measured conductor 10 such that the magnetic flux generated by a current flowing through the conductor becomes substantially parallel to the magnetic-force sensing face +21 in the magnetic-force sensing face 21 of the Hall element 20.
Owner:YAZAKI CORP
Magnetoresistive magnetic field sensors and motor control devices using same
InactiveUS20030057938A1Improve temperature stabilityReduce impactMeasurement using dc-ac conversionMagnetic-field-controlled resistorsElectric field NMRMotor control
A magnetic field measuring device useful for measuring a magnetic field associated with an electric current, including a bus section connectable into the path of the electric current, a first magnetoresistive (MR) bridge oriented to be sensitive to the magnetic field of a current in the bus section, a second MR bridge oriented to be substantially insensitive to the magnetic field of a current in the bus section, a biasing coil configured and positioned to apply a magnetic field to the first and second MR bridges, whereby the sensitivity of the first MR bridge can be controlled; and a signal processing device responsive to a voltage output of the second MR bridge to control the current through the biasing coil. The device exhibits good rejection of stray magnetic and electric fields, is convenient to use, and can be fabricated in a single chip, with or without associated signal processing and conditioning circuitry, using conventional IC processing techniques.
Owner:INTERNATIONAL RECTIFIER COEP
Coreless current sensor
InactiveUS6965225B2Easy to installLarge signal outputMeasurement using dc-ac conversionMagnetic measurementsElectrical conductorSurface coil
A time varying current sensor is constructed using surface coils uniformly spaced around a central cavity adapted to receive the conductor through which the current to be measured flows. Accurate and uniform coil geometry is achieved using printed circuit board technology, thereby eliminating the high cost of precision toroidal coil winding. An optional hinge in the housing can allow the sensor to be easily installed on existing conductors without the need to disconnect and reconnect.
Owner:GRID2020
Current sensor
ActiveUS20110227560A1Variation in characteristicSmall widthMeasurement using dc-ac conversionNanomagnetismElectrical resistance and conductancePotential difference
A current sensor includes first to fourth magneto-resistive elements each having a resistance value; and a compensation current line applying a compensation magnetic field to the magneto-resistive elements. A bridge circuit is formed by the magneto-resistive elements. Resistance values of the first and third magneto-resistive elements change together in one increasing / decreasing direction. Resistance values of the second and fourth magneto-resistive elements change together in the other increasing / decreasing direction. The compensation current is generated by a potential difference between the first and second junctions in response to application of voltage between the third and fourth junctions. The compensation current line includes first to fourth line portions. Each line portion extends in the same direction as the extending direction of the magneto-resistive elements, overlaps the corresponding magneto-resistive elements, and. The current-to-be-detected is detected based on the compensation current.
Owner:TDK CORPARATION
Alternator tester
InactiveUS20050035752A1Measurement using dc-ac conversionBatteries circuit arrangementsAlternatorTester device
An alternator tester is provided for testing an alternator of a vehicle while the alternator is coupled to the vehicle. A sensor is configured to couple to the vehicle and sense a signal related to operation of the alternator. A memory contains data related to operator instructions for performing an alternator tester of a function of vehicle type. A processor configured to provide an output indication of alternator condition based upon the sensed signal. An extra load or connection can be provided for coupling to the electrical system.
Owner:MIDTRONICS
Clamp-on current and voltage module for a power monitoring system
InactiveUS20080284410A1Measurement using dc-ac conversionMeasurement using ac-dc conversionElectricityElectrical conductor
A clamp-on current and voltage module for an electrical power monitoring system that monitors characteristics of power distributed through one or more power conductors includes a current transformer having a core divided into at least two parts so that the core can be installed around a power conductor without cutting the conductor. The transformer produces a current signal corresponding to current passing through the power conductor. A pair of clamping elements fit on opposite sides of the conductor, for gripping the conductor. The transformer core parts and the clamping elements have engaging surfaces that prevent relative movement between the CT enclosure and the power conductor in a direction transverse to the axis of the power conductor. A voltage sensor makes electrical contact with the power conductor and produces a voltage signal corresponding to the voltage on the power conductor.
Owner:SQUARE D CO
Current Sensor
InactiveUS6734661B2Reduce in quantityLess-expensive to manufactureMeasurement using dc-ac conversionDynamo-electric motor metersCurrent sensorWattmeter
A current sensor for measuring the load in a fiscal power meter has conductive paths connected between an inlet and an outlet for guiding the load currents through the sensor, and operates by sensing local magnetic fields generated around the conductive paths by the current flowing there through, thereby providing a current measure indicative of the magnitude of a given load. The sensor is distinguished by plural current coil elements arranged in a substantially common plane so as to be substantially insensitive to remotely generated magnetic fields but responsive to local magnetic fields for generating the current measure. The coil elements are disposed in zones having more than two effective centres and exhibiting mutually opposing responses to the remote field.
Owner:COLBY EDWARD GRELLIER
Magnetic flux concentrator current sensing topology
ActiveUS20050073295A1Eliminate needRemove restrictionsMeasurement using dc-ac conversionMagnetic measurementsElectrical conductorCurrent sensor
The present invention is directed to system and method for current sensing. A current sensor system includes a conductor configured to receive current flow therethrough and generate magnetic flux thereabout. The current sensor system also includes an anti-differential current sensor configured to monitor magnetic flux about the conductor and a flux concentrator configured to concentrate magnetic flux induced by current flow through the conductor.
Owner:EATON INTELLIGENT POWER LIMITED
Flexible current sensor
InactiveUS20060082356A1Motion resistanceMeasurement using dc-ac conversionBase element modificationsElectrical conductorCurrent sensor
A method and a current sensor for measuring a current in a conductor. The sensor comprises a non-magnetic, flexible core member having a first end and a second end. A locking head having a channel therethrough is coupled to the first end of the core member. A first sensor conductor winding layer is mounted on the core member. Wherein the second end releasably engages the locking thread in the channel and adjustably configures the core member to surround the conductor as the second end is moved through the channel. In another embodiment the current sensor includes a locking tang within the channel and a plurality of sought tooth members on a portion of the core member and configured to selectively engage the locking tang as the second end of the core member is moved through the channel.
Owner:SIEMENS ENERGY & AUTOMATION INC
Flexible current and voltage sensor
InactiveUS20140062459A1Measurement using dc-ac conversionBase element modificationsMetal foilEngineering
A flexible current and voltage sensor provides ease of installation of a current sensor, and optionally a voltage sensor in application such as AC branch circuit wire measurements, which may require installation in dense wiring conditions and / or in live panels where insulating gloves must be worn. The sensor includes at least one flexible ferromagnetic strip that is affixed to a current sensing device at a first end. The second end is secured to the other side of the current sensing device or to another flexible ferromagnetic strip extending from the other side of the current sensing device to form a loop providing a closed pathway for magnetic flux. A voltage sensor may be provided by metal foil affixed to the inside of the flexible ferromagnetic strip. A clamp body, which can be a spring loaded handle operated clamp or a locking fastener, can secure the ferromagnetic strip around the wire.
Owner:TERRACE LICENSING LLC
Arrangements for a current sensing circuit and integrated current sensor
ActiveUS20090295368A1Measurement using dc-ac conversionMagnetic measurementsElectricityElectrical conductor
An electronic circuit for sensing a current includes a circuit board having first and second major opposing surfaces and a current conductor for carrying the current. The current conductor includes a circuit trace disposed upon the circuit board. The electronic circuit also includes an integrated circuit disposed upon and electrically coupled to the circuit board at a position so as to straddle the current conductor.
Owner:ALLEGRO MICROSYSTEMS INC
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