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236results about "Automatic balancing arrangements" patented technology
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Theft detection and prevention in a power generation system
ActiveUS20100301991A1Prevent theftResistance/reactance/impedenceElectric testing/monitoringEngineeringElectric power
A system for generation of electrical power including an inverter connected to a photovoltaic source including a theft prevention and detection feature. A first memory is permanently attached to the photovoltaic source. The first memory is configured to store a first code. A second memory is attached to the inverter. The second memory configured to store a second code. During manufacture or installation of the system, the first code is stored in the first memory attached to the photovoltaic source. The second code based on the first code is stored in the second memory. Prior to operation of the inverter, the first code is compared to the second code and based on the comparison; the generation of the electrical power is enabled or disabled.
Owner:SOLAREDGE TECH 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
System and method for cable localization
InactiveUS20050212504A1Low costProduction of permanent recordsBroadcast transmission systemsNetwork topologyElectric cables
A method and system for determining cable network topology for a plurality of set-top boxes connected to the cable network, the method comprising using existing information transmitted within the cable network for a non-location purpose to determine an absolute physical location of at least one set-top box within the topology. Related methods and apparatus are also described.
Owner:CISCO TECH INC
Multimeter with filtered measurement mode
ActiveUS7034517B2Improve abilitiesSpecial tariff metersDynamo-electric motor metersVoltage spikeMotor drive
A multimeter with a filtered measurement mode. By pressing a single button or key, a low-pass filter is switched into the signal path to filter voltage spikes, noise, and switching transients from pulse-width modulated pulses, or lower frequency sinusoidal signals with higher frequency components, and at the same time an on-screen icon indicates to a user that the filtered mode has been selected. The user can switch back and forth between filtered and unfiltered modes. The filtered measurement mode is useful in measuring the outputs of modern adjustable-speed motor drives, uninterruptible power sources, and switch power supplies.
Owner:JOHN FLUKE MFG CO INC
Alternator tester
InactiveUS7706991B2Batteries circuit arrangementsMaterial analysis by electric/magnetic meansAlternatorDynamo
Owner:MIDTRONICS
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
High resolution current sensing apparatus
InactiveUS6348788B1High resolutionImprove performanceMeasurement using dc-ac conversionAnalogue/digital conversionSensor arrayCurrent sensor
A current sensor includes a deflectable member disposed in a magnetic field. Nulling or compensating members may be mechanically coupled to the deflectable member. Feedback or readout devices coupled to the structure provide signals indicative of deflection of the deflectable member under the influence of applied current and the magnetic field. Nulling current applied to the nulling members tends to oppose deflection of the deflectable member. The nulling current may be modulated to drive the feedback signal to a desired level and is used as a basis for calculating the current to be measured. The current may be measured directly upon calibration of feedback devices coupled to the deflectable member or to the nulling members. Arrays of sensors may be coupled to common busses for applying measured and nulling currents to sensors of the arrays and for detecting feedback signals.
Owner:ALLEN-BRADLEY CO LLC
Voltage detecting apparatus and line voltage detecting apparatus
InactiveUS20090319210A1Quick changeExpand the scope of detectionElectrical measurement instrument detailsElectrical testingElectricityVoltage converter
A voltage detector that detects an AC voltage in an object includes: an electrode disposed facing the object; a current-to-voltage converter that has a first input set at a reference voltage and a second input connected to the electrode and converts a detection current, which corresponds to a potential difference between the detected AC voltage and the reference voltage on a path including the electrode and a feedback circuit connected to the second input, to a detection signal; an integrating circuit that integrates the detection signal and outputs an integrated signal whose amplitude changes in accordance with the potential difference; an insulating circuit that inputs the detection signal or the integrated signal, and outputs the signal so as to be electrically insulated from the input; and a voltage generating circuit that generates the reference voltage by amplifying a signal based on the integrated signal to reduce the potential difference.
Owner:HIOKI DENKI KK
Low-Power Magnetic Slope Detecting Circuit
ActiveUS20120182658A1Linear/angular speed measurementAmplitude demodulationDigital storageEngineering
One embodiment of the present invention relates to a method and apparatus to perform a low power activation of a system by measuring the slope of a digital signal corresponding to a motion sensor measurement value. In one embodiment, a low power activation circuit is coupled to magnetic motion sensor configured to output a magnetic signal proportional to a measured magnetic field. The low power activation circuit may comprise a digital tracking circuit configured to provide a digital signal that tracks the magnetic field and a difference detector configured to detect a difference between a current digital signal and a prior digital signal stored in a digital storage means. If the detected difference is larger than a digital reference level, an activation signal is output to awaken a system from a sleep mode.
Owner:INFINEON TECH AG
Theft detection and prevention in a power generation system
ActiveUS8947194B2Prevent theftResistance/reactance/impedencePV power plantsEngineeringElectric power
A system for generation of electrical power including an inverter connected to a photovoltaic source including a theft prevention and detection feature. A first memory is permanently attached to the photovoltaic source. The first memory is configured to store a first code. A second memory is attached to the inverter. The second memory configured to store a second code. During manufacture or installation of the system, the first code is stored in the first memory attached to the photovoltaic source. The second code based on the first code is stored in the second memory. Prior to operation of the inverter, the first code is compared to the second code and based on the comparison; the generation of the electrical power is enabled or disabled.
Owner:SOLAREDGE TECH LTD
Digital multi-meter
InactiveUS7468602B2Versatile test instrumentEasy and quick connectionSpecial tariff metersElectrical measurement instrument detailsApplication softwareDigitization
A digital multi-meter (DMM) is described which can be inserted into a peripheral device card expansion slot of a personal digital assistant (PDA) to provide the PDA with DMM functionality. The DMM is configurable by configuration data supplied by application software running on the PDA. Configuration of the DMM may include, for example, setting measurement function and input ranges. The DMM internal circuitry measures input signals, digitizes them and supplies them to the PDA for display and / or storage. This allows for a data acquisition unit which combines a DMM with the computing power of a PDA. The PDA may be programmed to display or store data in a multitude of ways, depending on the requirements of a particular application. The combined DMM and PDA may benefit from various other functions of the PDA, for example wireless communication of data to allow remote data logging.
Owner:ELAN TRADING
Clamp meter with dual display
A clamp type digital multimeter has one or more digital displays mounted so as to permit at least one of the displays to be read even when attachment of the clamp jaws about a conductor forces the display into an orientation that renders it inaccessible. The meter either has a single display that can be pivoted to an orientation convenient for viewing, or it has dual displays mounted on separate surfaces of the meter's housing. A protective flap may cover one or both of the displays when it is not needed for viewing.
Owner:IDEAL IND INC
Apparatus, system, and method for precise early detection of ac power loss
InactiveUS20100169031A1Mitigate effect of power failureDoubling the time available for system recoveryElectric signal transmission systemsBatteries circuit arrangementsComputer moduleEngineering
An apparatus, system, and method are disclosed for determining power source failure. A sampling module samples an alternating current power waveform as input to a power supply, at a sampling frequency which is a multiple of a predetermined frequency, to obtain a sampled amplitude at a known point within the predetermined period. A comparison module compares the sampled amplitude to a stored threshold amplitude to obtain a comparison result, corresponding to the known point. An accumulation module accumulates most recent comparison results. A warning module asserts an early power off warning signal if a predetermined number of the most recent comparison results each indicate that the sampled amplitude is smaller in absolute value than the stored threshold amplitude.
Owner:IBM CORP
Current sensor
A current sensor includes a sensing circuit for sensing current and supplying indications thereof. The current sensor also includes two or more output terminals coupled to the sensing circuit that alternately supply respective indications of the sensed current according to control signals supplied to the current sensor.
Owner:SILICON LAB INC
Current measurement
ActiveUS20140354266A1Accurate operationImprove accuracyDigital variable/waveform displayCurrent measurements onlyMeasurement deviceEngineering
Current measurement apparatus comprises a measurement arrangement and a signal source. The measurement arrangement is configured to measure a current signal drawn by a load. The signal source is operative to apply a reference input signal to the measurement arrangement whereby an output signal from the measurement arrangement comprises a load output signal corresponding to the load drawn current signal and a reference output signal corresponding to the reference input signal. The signal source comprises a current multiplier which defines first and second current paths and is configured such that: the first path carries a multiplier input current signal; the second path carries a multiplier output current signal which determines the reference input signal and which corresponds to the multiplier input current signal multiplied by a multiplier value determined by the current multiplier; and the multiplier input current signal and the multiplier output current signal are carried on their respective paths in a same direction relative to a power supply voltage. Power drawn through the second path as divided by the multiplier value is less than the power drawn through the first path.
Owner:ANALOG DEVICES INT UNLTD
Digital multi-meter
InactiveUS20070069716A1Reduce needVersatile test instrumentSpecial tariff metersElectrical measurement instrument detailsApplication softwareData combination
A digital multi-meter (DMM) is described which can be inserted into a peripheral device card expansion slot of a personal digital assistant (PDA) to provide the PDA with DMM functionality. The DMM is configurable by configuration data supplied by application software running on the PDA. Configuration of the DMM may include, for example, setting measurement function and input ranges. The DMM internal circuitry measures input signals, digitizes them and supplies them to the PDA for display and / or storage. This allows for a data acquisition unit which combines a DMM with the computing power of a PDA. The PDA may be programmed to display or store data in a multitude of ways, depending on the requirements of a particular application. The combined DMM and PDA may benefit from various other functions of the PDA, for example wireless communication of data to allow remote data logging.
Owner:ELAN TRADING
Voltage detecting apparatus and line voltage detecting apparatus having a detection electrode disposed facing a detected object
InactiveUS8222886B2Quick changeExpand the scope of detectionElectrical measurement instrument detailsElectrical testingVoltage converterElectricity
Owner:HIOKI DENKI KK
Overcurrent detection apparatus and intelligent power module using same
An overcurrent detection apparatus includes a sense emitter current detection unit that detects a sense emitter current output from a sense emitter of an IGBT as a sense emitter voltage, and a comparison unit that detects an overcurrent by comparing the sense emitter voltage detected by the sense emitter current detection unit with a threshold voltage. The overcurrent detection apparatus also includes a correction current detection unit that detects a correction current corresponding to a current flowing between a gate and the sense emitter of the IGBT as a corrected voltage; and a voltage correction unit that calculates a sense emitter corrected voltage by subtracting the correction voltage detected by the corrected current detection unit from the sense emitter voltage detected by the sense emitter current detection unit, and supplies the sense emitter corrected voltage to the comparison unit.
Owner:FUJI ELECTRIC CO LTD
High resolution current sensing apparatus
InactiveUS20020021122A1High resolutionImprove performanceAnalogue/digital conversionMeasurement using dc-ac conversionSensor arrayCurrent sensor
Owner:ROCKWELL AUTOMATION TECH
Self learning radio frequency monitoring system for identifying and locating faults in electrical distribution systems
ActiveUS20150316606A1High power plant reliabilityIncrease powerFault location by conductor typesAutomated test systemsMonitoring systemDistribution power system
Electrical faults are detected in electrical distribution systems (EDS) by detection and location of radio frequency (RF) emissions generated by the fault with multiple time-synchronized radio frequency monitors (RFM) distributed about the EDS. The RFMs are coupled to a self-learning, electrical fault monitor (EFM) that characterizes and / or locates electrical faults based on operating state (OS) patterns learned from transmission of test signals generated within the EDS. RF emissions data samples are characterized as safe operation (SO) states or potential electrical faults by accessing a base of stored knowledge concerning fault emission characteristics and / or synchronized time of arrival at each RFM. Information in the base of stored knowledge is updated to include new EDS operating states (OS). Confidence level associations, location of new radio frequency emission patterns and whether those patterns are indicative of safe operating (SO) conditions or electrical faults are stored in the base of stored knowledge.
Owner:SIEMENS ENERGY INC
Electrical signal measurement
ActiveUS20160154029A1Resistance/reactance/impedenceElectrical measurement instrument detailsElectricityMeasurement device
Owner:ANALOG DEVICES INT UNLTD
Compensation for voltage drop in automatic test equi0pment
ActiveUS20080024159A1Tested and reliableAnalogue/digital conversionElectric signal transmission systemsControl powerVoltage drop
Providing reliable testing of a device under test (DUT) by compensating for a reduced voltage inside the device without changing the internal circuitry of the device. The DUT has multiple connection terminals for connecting to the test equipment including at least first and second power connection terminals that both connect to an internal power bus of the DUT. An adapter board connects to the multiple connection terminals of the DUT via a removably attachable socket which holds the DUT. A tester supplies power to the DUT through the adapter board. The adapter board is configured to supply power from the tester to the DUT through the first power connection terminal and to monitor voltage at the second power connection terminal. The tester includes a compensation unit which controls power based on the voltage monitored at the second power connection terminal.
Owner:MARVELL ISRAEL MISL
Device and a method for power balancing
ActiveUS20060255791A1Single-phase induction motor startersLevel controlVoltage amplitudeElectric power system
A method for stabilization of the power balance in an electric power system including a number of nodes. An instantaneous value of the mains frequency of the electric power system is sensed. In dependence on the frequency deviation of the instantaneous value from a reference frequency value, a selected part of the electric power system, connected in a node, is disconnected in the node. A voltage amplitude value is sensed in the node. A measure of the magnitude of the deviation of the voltage amplitude value from a reference amplitude value is formed. A time lag is formed in dependence on the measure of the magnitude. The part of the electric power system is disconnected in dependence on the time lag.
Owner:HITACHI ENERGY SWITZERLAND AG
Tester and testing method, and testing unit
InactiveCN1358274AAutomatic balancing arrangementsContactless circuit testingEngineeringElectrical and Electronics engineering
The present invention provides an inspection apparatus, an inspection method and an inspection unit therefor capable of inspecting a conductive pattern in a complete non-contact manner. In the method for inspecting a conductive pattern of a circuit board in a complete non-contact manner, a plurality of electrically conductive cells 11 are arranged along the conductive pattern of the circuit board 100 with leaving a space therebetween. An inspection signal having temporal variations is supplied to at least one of the cells in the conductive pattern without using any pin. An output signal appearing at another at least one of the cells through the conductive pattern in response to the applied inspection signal is detected. The conductive pattern is inspected based on the detected output signal.
Owner:OHT
Sensor circuit and calibration method
Owner:NXP BV
Circuit and method for sensing a differential capacitance
InactiveUS20120274340A1Reducing source noiseReduce interferenceResistance/reactance/impedenceConverting sensor output electrically/magneticallyEngineeringDifferential capacitance
A circuit and a method for sensing differential capacitance involve using plural storing capacitors to repeatedly sample charges of the differential capacitance in an over-sampling manner, and storing the charges sampled in different transfer rounds into different storing capacitors instead of repeatedly transferring charges for a single storing capacitor, so as to collect charge averages about both inputs and noises and in turn effectively reduce RF interference and source noises.
Owner:ELAN MICROELECTRONICS CORPORATION
AC bridge with automatic auxiliary balancing function and impedance measurement method
ActiveCN103529268AFast convergenceAccurate and fast AC impedance measurementResistance/reactance/impedenceAc/dc measuring bridgesNegative feedbackAc impedance
The present invention provides an AC bridge with an automatic auxiliary balancing function and an impedance measurement method. The AC bridge comprises the following components: an AC power supply, a main inductive voltage divider, an auxiliary inductive voltage divider and a null indicator. The main inductive voltage divider and the auxiliary inductive voltage divider have a same inductive voltage dividing ratio. A negative feedback branch circuit which is obtained through serially connecting an active voltage follower, an inverting amplifier, a wave filter and an insulating transformer is arranged between the main inductive voltage divider and the auxiliary inductive voltage divider. An original edge of the insulating transformer is connected with the auxiliary inductive voltage divider. The input end of the active voltage follower is connected with the main inductive voltage divider, and the output end is connected with the null divider. According to the measurement method, after the divided voltage on the main inductive voltage divider is processed by the negative feedback branch circuit, the branch circuit of the null indicator automatically acquires ground potential. The bridge can realize impedance comparing measurement through a simple main balance. The AC bridge of the invention realizes accurate and quick AC impedance measurement and greatly improves convergence rate of the AC bridge.
Owner:NAT INST OF METROLOGY CHINA
Digital bridge capacitive measuring module
ActiveCN104296786ASuppress interferenceHigh precisionConverting sensor output electrically/magneticallyAutomatic balancing arrangementsBandpass filteringPhase difference
The invention provides a digital bridge capacitive measuring module. According to the following technical scheme, a balancing bridge arm and a measuring bridge arm form a digital balancing mechanism, wherein the phase difference between alternating signals of the balancing bridge arm and the measuring bridge arm is 180 degrees; an excitation source unit generates three kinds of signals, wherein the 0-degree phase driving signals are used for driving a synchronous amplification circuit to send orthogonal filtering measuring signals into a zero-position balancing unit to generate rebalancing monitoring signals, the AC reference signals are used for driving a capacitor-balanced bridge arm circuit, and the AC excitation signals are used for driving a BITE detection bridge arm circuit in different times; the two alternating signals, with the phase difference being 180 degrees, of the balancing bridge arm and the measuring bridge arm are summed through a summing circuit and are filtered into a 0-degree phase driving signal and a 90-degree phase driving signal through a band-pass filter circuit; a CPU control unit conducts balance control on a D / A converter in the zero-position balancing unit, data of the D / A converter are compared with theoretical data pre-stored in the CPU control unit, and the CPU control unit uses the data, obtained when it is detected that the balancing bridge arm and the measuring bridge arm are balanced, of the D / A converter as the currently measured capacitance value.
Owner:四川泛华航空仪表电器有限公司
Electric charge flow circuit for a time measurement
ActiveUS8872177B2Small leakage speedSemiconductor/solid-state device detailsElectric analogue storesElectricityCapacitance
A charge flow circuit for a time measurement, including a plurality of elementary capacitive elements electrically in series, each elementary capacitive element leaking through its dielectric space.
Owner:STMICROELECTRONICS (ROUSSET) SAS
Resistance bridge architecture and method
ActiveUS20110001502A1Resistance/reactance/impedenceThermometers using electric/magnetic elementsEngineeringConstant current source
One or more embodiments are directed to a resistance bridge having two voltage measurements circuits that function in tandem. In one embodiment, a constant current source may be applied to two resistors coupled in series, in which the first resistor has a known resistance and the second resistor has a resistance to be determined or verified. A first measurement circuit may measure a first voltage across the first resistor and at substantially the same time a second measurement circuit measures a second voltage across the second resistor. The voltage of each resistor is converted to a ratio. Based on the ratio and the resistance of the first resistance, the resistance of the second resistor may be calculated.
Owner:JOHN FLUKE MFG CO INC
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