42results about "Frequency selective voltage/current level measurement" patented technology

The invention relates to the technical field of electric energy identification, in particular to an energy consumption identification system based on a power transformation aliasing scene, which comprises a disturbance boundary extraction module, a boundary stability judgment module, an aliasing state identification module, a periodic power calculation module and an energy consumption attribution judgment module. According to the method, a voltage sag record with a phase offset characteristic is formed through continuous tracking of the periodic voltage fluctuation starting and ending point indexes, a stable fluctuation judgment mechanism is constructed in combination with offset statistics, and accurate identification of aliasing sections is realized by means of disturbance amplitude and frequency extraction. A power sequence is constructed on the basis of voltage and current synchronous sampling values, period integration is completed, a high-precision calculation result of energy consumption is formed, fine division of cross interference period energy consumption under the condition of no physical isolation is achieved, dependence of external metering equipment is avoided, independent quantization of overlapping load energy consumption is achieved, and the calculation efficiency is improved. And a feasible means is provided for energy efficiency evaluation in a non-intrusive load identification and high-coupling scene.

An electronic device may include an antenna, a receiver, and a transmission line path that couples the antenna to the receiver. A peak detector may receive a radio-frequency signal from the transmission line path and may output a DC voltage indicative of a peak voltage level of the signal. The peak detector may include a pair of square law transistors having source-drain terminals coupled to an output of the peak detector. The peak detector may include a differential pair of transistors coupled between a power supply voltage and the output. The peak detector may include diode-connected transistors coupled between the source-drain terminals and gate terminals of the square law transistors. The diode-connected transistors may cause noise current to flow along feedback loop paths from the source-drain terminals onto the gate terminals of the square law transistors. This may remove noise from the output of the peak detector.

This application relates to the field of lightning rod lightning protection monitoring technology, specifically to a corona field delayed lightning rod and its operation monitoring method. The method includes: collecting corona current and electric field intensity at each moment within each monitoring cycle during the operation of the lightning rod; calculating the first evaluation value and electric field anomaly degree for each time period in each monitoring cycle to obtain the first interference degree for each time period in each monitoring cycle; determining the second evaluation value and cycle anomaly degree for each time period in each monitoring cycle to obtain the second interference degree for each time period in each monitoring cycle; determining the interference coefficient for each monitoring cycle; and evaluating the data distortion status monitored during the operation of the lightning rod. This application, by evaluating the monitored data distortion status, reduces the possibility of misjudgment or omission of lightning strike risk by the lightning rod, and improves the accuracy of assessing the strength of corona discharge generated by the corona field delayed lightning rod under the action of the electric field and the activity of thunderclouds.

An electronic device may include an antenna, a receiver, and a transmission line path that couples the antenna to the receiver. A peak detector may receive a radio-frequency signal from the transmission line path and may output a DC voltage indicative of a peak voltage level of the signal. The peak detector may include a pair of square law transistors having source-drain terminals coupled to an output of the peak detector. The peak detector may include a differential pair of transistors coupled between a power supply voltage and the output. The peak detector may include diode-connected transistors coupled between the source-drain terminals and gate terminals of the square law transistors. The diode-connected transistors may cause noise current to flow along feedback loop paths from the source-drain terminals onto the gate terminals of the square law transistors. This may remove noise from the output of the peak detector.

Embodiments disclosed herein include a sensor. In an embodiment, the sensor comprises a board, wherein an aperture is formed through the board, a current loop winding through the board around the aperture, and a voltage ring around the aperture and within an inner perimeter of the current loop, wherein the voltage ring comprises an interior ring, an insulator ring around the interior ring, and an exterior ring around the insulator ring.

A magnetic field sensor for sensing a current flowing in a first direction divided in at least two conductor portions separated in a second direction, the sensor comprising at least two sensing elements for sensing the magnetic field at two positions in a region between the two conductor portions, wherein the at least two sensing elements are adapted to sense the field at the respective position with the highest sensitivity in a direction being between 20 degrees and 160 degrees from a third direction being perpendicular to both the first and second direction, wherein the two positions are separated by a predetermined distance in the third direction

A test and measurement probe system, including an input to receive an input signal, the input signal including a low frequency (LF) and / or direct current (DC) component and an alternating current (AC) component, an extractor circuit, such as an AC coupling circuit or a LF and / or DC rejection circuit, configured to receive the input signal and to separate the AC component and the LF and / or DC component from the input signal, a first output to output the alternating current component to the test and measurement instrument, and a second output to output the direct current component to the test and measurement instrument. In some embodiments, the LF and / or DC component is digitized prior to being output by the second output.

An impedance measurement device of the present disclosure includes: an electrochemical energy device; an amplifier connected to each connection terminal of the electrochemical energy device and configured to amplify a signal introduced into a wiring; and a main board configured to receive the signal from the amplifier and measure an impedance. Accordingly, the present invention has advantages in that high resistance to electromagnetic interference may be achieved by disposing a preamplifier close to a terminal of an electrochemical energy device to amplify only the signal without amplifying a noise introduced into a wiring.

System for diagnosing a battery cell (204) of a vehicle (100), comprising: a processor (302) and a working memory (304) or data storage (308) comprising an algorithm or computer instructions which, when executed by the processor (302), perform an operation comprising: Determine that a current flows through a current collector (206, 214) of the accumulator cell (204), Generating a mechanical excitation of the current collector (206, 214), Determining the amplitude of a voltage across the accumulator cell (204) based on mechanical excitation, and Determining the presence of a crack or separation of a foil of the current collector (206, 214) on the basis of the amplitude of the voltage across the accumulator cell (204).

The present invention relates to the field of power systems and automation, and discloses a method and system for identifying discharge hazards of transmission lines. The method comprises: acquiring and processing measured data of discharge hazards of the transmission lines, high-frequency discharge waveform data, and acquiring and discharge event data; creating a hazard identification requirement table and initializing same, and updating all elements in the table in the time sequence; looking up, for each newly acquired waveform segment, table to determine the operation and maintenance requirement, and performing comprehensive early warning on the hazard state of the lines.

The invention discloses a motor phase current sampling device and method, a chip and a motor controller, the device comprises a reference voltage providing unit, a sampling unit and a control unit, the reference voltage providing unit is connected with the reference ground end of the sampling unit, and the control unit is connected with the sampling unit; the reference voltage providing unit is used for outputting partial voltage of neutral point voltage of the motor; the sampling unit is used for sampling a motor phase voltage corresponding to each phase of bridge arm in the multi-phase bridge arm based on voltage division; the control unit is used for controlling the reference voltage providing unit to output the partial voltage of the voltage of the neutral point of the corresponding motor in the target sampling period of each phase of bridge arm in a pulse modulation period, and controlling the sampling unit to sample the corresponding motor phase voltage based on the partial voltage to obtain a plurality of motor phase voltage sampling values. Determining a motor phase current according to the plurality of motor phase voltage sampling values; wherein the target sampling time period is the time period from the dead time corresponding to each phase of bridge arm to the time period before follow current is completed. The phase current sampling cost of the device is low.

The invention relates to a method for measuring a current digitally recombining a low-frequency current signal IBF from a low-frequency current sensor and at least one high-frequency current signal IHF+offset from a high-frequency current sensor on the same current conductor, the method comprising the steps of amplifying, filtering and summing the signals, said steps being suitable for eliminating a DC offset created in the amplification of the HF signals.

According to the cable fault positioning device and method in the operation state of the cross interconnection system, the cross interconnection system does not need to be reconnected, positioning is carried out by capturing the time difference of fault breakdown current through the head end sensor and the tail end sensor, the problems that a grounding system needs to be disassembled and complex waveform recognition experience is relied in a traditional method are solved, and the fault positioning accuracy is improved. The efficiency and accuracy of long-distance cable fault positioning and the convenience of field operation are improved; according to the cable fault positioning device, a tested fault cable grounding system is in a cross interconnection operation state, and the cable fault positioning device comprises an impulse voltage unit, a head end sampling unit, a tail end sampling unit and a data processing system. The impulse voltage unit is used for generating impulse voltage enabling breakdown discharge of a cable fault point; and the head end sampling unit filters out high-frequency impact current generated when the impact voltage unit discharges, provides a follow current channel for pulse current generated by breakdown of a cable fault point, collects the pulse current generated by breakdown of the cable fault point, records the pulse current and uploads the pulse current to the data processing system.

A power detection circuit for detecting a current total input power of a resonant circuit. The power detection circuit comprises a detection circuit and an estimation circuit. The detection circuit receives a current signal and obtains a resonant tank fundamental power from the current signal to generate a fundamental power value. The current signal represents a resonant tank current generated by the resonant circuit. The estimation circuit receives the fundamental power value and estimates the current total input power from the fundamental power value to generate an estimated power value. The disclosure also relates to a control circuit.

A current sensor system for accurately measuring AC currents with frequencies up to 2 kHz includes: an electrical conductor (e.g., a busbar) for conducting the AC current to create a first magnetic field; a magnetic sensor device for measuring a component or gradient of the magnetic field; and an object (e.g., a metal plate) having a conductive surface disposed near the conductor to allow eddy currents to flow in the surface, thereby creating a second magnetic field superimposed on the first magnetic field; wherein the magnetic sensor device is configured to determine the current as a signal or value proportional to the measured component or gradient. The metal plate may have openings. The current sensor system may further include a shield.

The present application relates to the technical field of electric energy identification, in particular to an energy consumption identification system based on a power transformation aliasing scene, which comprises a disturbance boundary extraction module, a boundary stability determination module, an aliasing state identification module, a periodic power calculation module and an energy consumption attribution determination module.In the present application, the start and end points of the periodic voltage fluctuation index are continuously tracked to form a voltage sag record with phase offset characteristics, a stable fluctuation determination mechanism is constructed in combination with offset statistics, and the accurate identification of the aliasing section is realized with the help of disturbance amplitude and frequency extraction, the power sequence is constructed on the basis of voltage and current synchronous sampling values, the periodic integral is completed, the high-precision calculation result of energy consumption is formed, the fine division of the cross-interference periodic energy consumption is realized under the condition of no physical isolation, the dependence on external metering equipment is avoided, the independent quantification of the overlapping load energy consumption is realized, and a feasible means is provided for non-intrusive load identification and energy efficiency evaluation in a high-coupling scene.

A device and a method of sensing and compensating an overshoot voltage are disclosed. The device includes a power converter and an overshoot voltage compensation circuit. The overshoot voltage compensation circuit includes an overshoot voltage sensing circuit to generate a first comparison voltage by performing a filtering operation on the output voltage, and an overshoot voltage control circuit to generate a first control signal for controlling the operation of a power transistor based on the first comparison voltage. The first control signal may be a signal that controls the operation of the first power transistor to change a slope of a current flowing through an inductor included in the power converter versus time.

The invention belongs to the technical field of electric digital data processing, and particularly relates to a special power supply fault diagnosis method based on multi-scale feature fusion, which comprises the following steps: acquiring an output pulse sequence of a special power supply in an operation process; according to the fluctuation energy between adjacent sampling points in the output pulse sequence and the overall energy characteristics of the output pulse sequence, determining a self-adaptive scale factor for representing the signal background activity degree; for each sampling point in the output pulse sequence, determining a local attention weight corresponding to each sampling point based on the local gradient value; and in combination with the adaptive scale factor, the local attention weight and the local deviation value of each sampling point relative to the standard pulse data, determining a health score for reflecting the performance degradation degree of the special power supply, and identifying the running state of the special power supply according to the health score. The health state of the special power supply can be accurately evaluated, and the fault diagnosis sensitivity under the complex working condition is improved.

According to the IGBT hard switching loss current-sensor-free measurement method suitable for the INPC topology provided by the invention, the commutation process of the IGBT in the INPC topology is systematically analyzed from the physical mechanism of the hard switching process of a power device, and the switching characteristics of the IGBT are mainly researched. On the basis, the mapping relation between the voltage waveform characteristic and the current change and the switching loss is defined, and a corresponding hard switching loss analysis model is established. The established model only depends on device data manual parameters and actual measurement set-emitter voltage data, a current sensor or an additional test structure does not need to be introduced into a main power loop, effective evaluation of the IGBT hard switching loss in the INPC topology can be achieved, the measurement method has low requirements for test conditions, good engineering applicability is achieved, and the method is suitable for large-scale popularization and application. And the accuracy is verified through a simulation result.

The invention discloses a flexible DC converter dual fault identification method comprising the following steps: taking a flexible DC converter as a research object, carrying out period division on collected voltage data, calculating to obtain a deformation value in each period, determining the characteristic ratio of different fault types according to the deformation value, and calculating the fault type according to the characteristic ratio; and amplifying the characteristic ratio to obtain a characteristic strip of the fault type, simulating open-circuit faults of IGBT tubes of different modules, forming a fault characteristic strip library, and realizing identification of double faults of the flexible DC converter. The method gets rid of dependence on an unstable data source; the fault recognition efficiency is improved by constructing a fault feature strip library; a targeted fault handling method is provided, and a closed-loop design from identification to processing is realized.

The invention relates to a fault diagnosis method, device and equipment for checking a switch control loop based on multiple nodes. The method comprises the following steps: acquiring a switch state signal of switch equipment in a power distribution network and a voltage pulse signal and a current signal of the switch control loop when the switch equipment executes an action in real time; performing timestamp alignment processing on the switch state signal, the voltage pulse signal and the current signal to obtain correlation analysis data; and performing fault judgment by adopting a logic rule according to the correlation analysis data to obtain a fault type. According to the fault diagnosis method based on the multi-node check switch control loop, the obtained data is subjected to time alignment processing to obtain the correlation analysis data, then the correlation analysis data is analyzed through multiple logic rules, different fault types can be efficiently analyzed, the accuracy and response speed of fault detection can be improved, and the fault diagnosis efficiency is improved. The problems of low inspection efficiency and long troubleshooting period caused by human factor interference in a fault diagnosis mode of an existing switch control loop are solved.

The invention belongs to the technical field of power equipment monitoring and diagnosis, discloses a correlation diagnosis method and system for partial discharge and temperature rise characteristics of a switch cabinet, and aims to solve the problems of coupling fault missing detection, threshold value fixation and response delay caused by independent analysis of partial discharge and temperature rise signals in existing switch cabinet monitoring. The structure integrated hard coupling sensing assembly synchronously collects PD and temperature rise signals; the double clock domains in the hardware decision-making unit synchronously process nanosecond-level PD and minute-level temperature rise parameters. The hardware arithmetic logic unit calculates a PD and temperature rise correlation diagnosis factor # imgabs0 # in real time; setting a dynamic fusing mechanism, and switching to a pure PD mode when the PD amplitude exceeds a threshold value; and after the factor # imgabs1 # is compared with a multi-stage hardware threshold value, an alarm is output. According to the method, the time scale mismatch of the multi-source signal is effectively overcome, and the coupling fault diagnosis accuracy and the real-time response capability are improved.

The invention discloses a current sensor and a system. A magnetic field sensor for sensing a current flowing in a first direction, the current being divided in at least two conductor portions separated in a second direction, the sensor comprising at least two sensing elements for sensing a magnetic field at two locations in a region between the two conductor portions, the at least two sensing elements are adapted to sense the field at respective positions with highest sensitivity in a direction between 20 degrees and 160 degrees from a third direction perpendicular to both the first and second directions, where the two positions are separated by a predetermined distance in the third direction.

Embodiments described herein relate to a DC current measurement circuit, a method of DC current measurement and an electronic device including the DC current measurement circuit. The DC current measurement circuit includes a shunt resistor, an LPF, and an amplifier. The shunt resistor is electrically connected in a current path and configured to convert a current flowing through the current path to a voltage signal. The LPF is electrically connected to the shunt resistor and configured to receive the voltage signal from the shunt resistor and output a filtered voltage signal. The amplifier is connected to the LPF and configured to receive the filtered voltage signal and provide a measurement signal. The measurement signal provides a measurement of the current flowing through the current path.

A current sensor system for accurately measuring an AC electrical current having frequencies up to 2 kHz, the system comprising: an electrical conductor (e.g. busbar) for conducting said AC current thereby creating a first magnetic field; a magnetic sensor device for measuring a magnetic field component or gradient; an object (e.g. a metal plate) having an electrically conductive surface arranged in the vicinity of said conductor for allowing eddy currents to flow in said surface, thereby creating a second magnetic field which is superimposed with the first magnetic field; wherein the magnetic sensor device is configured for determining the current as a signal or value proportional to the measured component or gradient. The metal plate may have an opening. The current sensor system may further comprise a shielding.

In an embodiment, an electronic circuit includes: one or more input terminals configured to receive measurement data; and a controller configured to: determine a first harmonic current based on a first current flowing through a first circuit coupled to a line node, where the measurement data includes first current data indicative of the first current, determine a filter harmonic current based on a filter current flowing through an AC filter coupled to the line node, where the measurement data includes filter current data indicative of the filter current, and generate a first flag indicative of failure, degradation or malfunction of a first capacitor or capacitor bank based on the first harmonic current and the filter harmonic current, where the AC filter includes the first capacitor or capacitor bank.

The invention relates to the technical field of vehicles, and discloses a current ripple counting method and a vehicle, and the method comprises the steps: obtaining a current ripple waveform of a part motor under a current working condition; calculating the target offset time delay of the anti-pinch trigger reversal angle displacement in the current ripple waveform; and carrying out ripple counting on the ripple waveform in the anti-pinch execution stage in the current ripple waveform based on the target offset time delay to obtain a target ripple number. The method solves the problems that the angular displacement counteracting time delay in the reverse rotation stage of the motor after anti-pinch triggering lacks accurate calculation, so that ripple counting in the anti-pinch execution stage is inaccurate, and vehicle window positioning and anti-pinch function response are affected.

An electronic device may include an antenna, a receiver, and a transmission line path that couples the antenna to the receiver. A peak detector may receive a radio-frequency signal from the transmission line path and may output a DC voltage indicative of a peak voltage level of the signal. The peak detector may include a pair of square law transistors having source-drain terminals coupled to an output of the peak detector. The peak detector may include a differential pair of transistors coupled between a power supply voltage and the output. The peak detector may include diode-connected transistors coupled between the source-drain terminals and gate terminals of the square law transistors. The diode-connected transistors may cause noise current to flow along feedback loop paths from the source-drain terminals onto the gate terminals of the square law transistors. This may remove noise from the output of the peak detector.

An auxiliary power circuit may measure a first time during which the voltage level of a capacitor falls from a first level to a second level by a leakage current of the capacitor, may charge the capacitor to a third level, may measure a second time during which the voltage level of the capacitor falls from the third level to a fourth level by the leakage current of the capacitor and a discharge current of a current source, may calculate a capacitance of the capacitor based on the first level, the second level, the first time, the third level, the fourth level, the second time and the discharge current of the current source, and may determine the state of the capacitor based on the calculated capacitance of the capacitor.

A magnetic field sensor for sensing a current flowing in a first direction divided in at least two conductor portions separated in a second direction, the sensor comprising at least two sensing elements for sensing the magnetic field at two positions in a region between the two conductor portions, wherein the at least two sensing elements are adapted to sense the field at the respective position with the highest sensitivity in a direction being between 20 degrees and 160 degrees from a third direction being perpendicular to both the first and second direction, wherein the two positions are separated by a predetermined distance in the third direction