1526results about "Capacitance measurements" patented technology

The invention relates to the technical field of electrical variable measurement, in particular to a cable shielding layer state monitoring method and system for a shielding data cable. The method comprises the following steps: acquiring parameter values at a current moment and a historical moment, and acquiring a corrected capacitance value at the historical moment; determining the number of the whole clusters according to the number of the clusters of each dimension; clustering is carried out independently according to the dimension of each environmental factor, and the influence coefficient of the environmental factors on the capacitance is obtained; selecting an adjacent moment, and obtaining a reference coefficient according to the parameter difference between the adjacent moment and the current moment; in the FCM algorithm, the distribution uniformity of fuzzy classes and a clustering result correction coefficient are determined according to the membership degree; determining an environmental influence factor according to the parameter difference between the current moment and the fuzzy class center, and obtaining a final correction membership degree of the data point at the current moment by combining all the indexes; and correcting the capacitance value according to the final correction membership degree to complete state monitoring. The reliability and the accuracy of judging the state of the cable shielding layer are improved.

The invention relates to the field of motor health management and predictive maintenance, in particular to a motor stator winding insulation state evaluation method and system based on a digital model. Comprising the following steps: S1, collecting high frequency of a motor stator winding, and generating multi-physical-quantity real-time data; s2, calculating a dynamic capacitance reference value according to real-time data of multiple physical quantities; s3, performing subtraction operation on the high-frequency equivalent capacitance measurement value and the dynamic capacitance reference value, and extracting an insulation degradation residual signal; s4, constructing a self-adaptive dynamic detection threshold according to multi-physical-quantity real-time data; s5, judging whether the absolute value of the insulation degradation residual signal is greater than a self-adaptive dynamic detection threshold or not: if so, judging that an insulation degradation event occurs; if not, judging that the operation state is a normal operation state; and S6, in response to the insulation degradation event, updating the insulation degradation index, and generating insulation state evaluation based on the updated insulation degradation index. According to the invention, false alarm under severe load fluctuation is avoided, and the accuracy and reliability of evaluation are significantly improved.

An aerosol-generating device for generating an aerosol from an aerosol-forming substrate is provided, the aerosol-generating device including: an electrically powered heater element configured to heat the aerosol-forming substrate; a temperature sensor coupled to the electrically powered heater element and configured to sense a temperature of the electrically powered heater element; a power source configured to supply power to the electrically powered heater element and the temperature sensor; and control electronics configured to measure an impedance value of the electrically powered heater element, correlate the measured impedance value with a value of impedance determined from the temperature of the electrically powered heater element as sensed by the temperature sensor, and control the supply of power to the electrically powered heater element based on the correlation. A method of controlling an electrically powered heater element of the aerosol-generating device is also provided.

The invention discloses an extra-high voltage DC bushing insulation state monitoring system and method, and belongs to the technical field of bushing monitoring, and the system comprises a monitoring platform, a bushing partial discharge monitoring device, and a bushing dielectric loss, capacitance and leakage current monitoring device. The bushing partial discharge monitoring device comprises a high-frequency partial discharge acquisition module and a high-frequency pulse current sensor, and the high-frequency pulse current sensor, the high-frequency partial discharge acquisition module and the monitoring platform are in signal connection in sequence; the bushing dielectric loss, capacitance and leakage current monitoring device comprises a dielectric loss acquisition module, a leakage current sensor and a signal sampling unit, the leakage current sensor and the signal sampling unit are both in signal connection with the dielectric loss acquisition module, and the dielectric loss acquisition module is in signal connection with the monitoring platform. According to the invention, through integration of the monitoring platform and the monitoring equipment, comprehensive real-time monitoring of the running state of the sleeve is realized.

The invention discloses an insulation resistance and capacitance measuring circuit and method based on monopulse double-edge analysis, and relates to the related field of the electrical insulation online monitoring technology, and the circuit comprises a detected object and an insulation detection circuit. The insulation detection circuit comprises a controlled pulse voltage source, a coupling resistance network, a current sensor, a switch control module, a signal modulation circuit and a processor. The measurement method implemented based on the circuit comprises the following steps: injecting a common-mode voltage pulse into a transmission line of the power transmission system by adopting a pulse transmitter; pulse current response is collected in real time, a current oscillogram is drawn, and a three-point sampling method is introduced to record a current value for insulation impedance parameter calculation; according to a load condition, a double-edge verification method is applied based on a pulse current attenuation characteristic, and insulation impedance parameters including a resistive component and a capacitive component are independently calculated by analyzing a pulse current rising edge and a pulse current falling edge. According to the invention, non-intrusive synchronous monitoring of resistive and capacitive components of line-to-ground impedance is realized, and the detection precision is improved.

Wireless circuitry is provided that includes a transformer having a primary coil and a secondary coil, a first group of switchable capacitors coupled to a first terminal of the primary coil, a second group of switchable capacitors coupled to a second terminal of the primary coil, and capacitance measurement circuitry selectively coupled to a center tap of the primary coil during a measurement mode. The capacitance measurement circuitry can include a current source, a current sink, a comparator, a voltage generator for providing one or more threshold / reference voltages to the comparator, a frequency measurement circuit, and a capacitance calculation circuit configured to compute a capacitance of the first and second groups of switchable capacitors.

The present invention relates to a method for analyzing a cathode active material, a cathode active material, a cathode and a lithium secondary battery, and, to: a method for analyzing a cathode active material; a cathode active material having a slope, obtained through the analysis method, of 0.00110-0.00130; a cathode comprising same; and a lithium secondary battery, the method comprising the steps of: (S1) preparing a cathode active material that comprises a layer-structured lithium-rich manganese-based oxide, which comprises both a Li2MnO3 phase and a LiMO2 (here, M is an element comprising at least one selected from Ni and Mn) phase, and manufacturing a lithium secondary battery that comprises a cathode comprising a cathode active material layer comprising 80 wt% or more of the cathode active material on the basis of the total weight of the cathode active material layer; (S2) obtaining a specific capacity-voltage graph (x-axis: specific capacity (mAh / g), and y-axis: voltage (V)) by activating the lithium secondary battery at a 0.1C-rate at 45°C ; and (S3) obtaining a slope by linearly fitting, in a section of the graph, data in which a voltage is 4.40-4.65 V.

The invention provides a capacitance compensation method and device for a withstand voltage and partial discharge test of an extra-high voltage shunt reactor, and belongs to the field of reactor capacitance compensation, and the method comprises the steps: obtaining a winding inherent capacitance parameter, separating a high-frequency component from a low-frequency component, analyzing a space coupling path, and calculating a temperature and humidity induced variable capacitive reactance offset. A collaborative capacitance parameter matrix is generated after weighted fusion, a nonlinear polarization attenuation factor is introduced and dynamically calibrated, a capacitance compensation reference model is established, and compensation is executed through a multi-stage compensation device. According to the invention, through dynamic modeling, accurate capacitance compensation, voltage distortion suppression and improvement of partial discharge detection sensitivity, the problems of insufficient compensation precision and poor adaptability in the prior art are solved.

A system may include a resistive-inductive-capacitive sensor, a driver configured to drive the resistive-inductive-capacitive sensor at a driving frequency, a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to measure phase information and amplitude associated with the resistive-inductive-capacitive sensor, and a noise detection circuit communicatively coupled to the measurement circuit and configured to determine a presence of external interference in the system based on at least one of the phase information and the amplitude information.

A system may include an array of sensor elements, the array of sensor elements each comprising a first type of passive reactive element, a second type of passive reactive element electrically coupled to the array of sensor elements, a driver configured to drive the array of sensor elements and the second type of passive reactive element, and control circuitry configured to control enabling and disabling of individual sensor elements of the array of sensor elements to ensure no more than one of the array of sensor elements is enabled at a time such that when one of the array of sensor elements is enabled, the one of the array of sensor elements and the second type of passive reactive element together operate as a resonant sensor.

The invention provides a capacitance value detection method and device for a capacitor in an inverter, and belongs to the field of inverters. The method comprises the following steps: based on pre-stored voltage change rate information of a to-be-measured capacitor, determining voltage recording moments when the current of the to-be-measured capacitor is zero, the voltage recording moments at least comprising a first moment and a second moment; obtaining a first voltage value of the to-be-measured capacitor at the first moment and a second voltage value of the to-be-measured capacitor at the second moment, and obtaining an accumulated charge quantity of the direct current bus for charging and discharging the to-be-measured capacitor in a time period corresponding to the first moment and the second moment; and finally, determining the capacitance value of the capacitor to be measured according to the first voltage value, the second voltage value and the accumulated charge quantity. According to the method, the inverter does not need to be shut down, the capacitor does not need to be detached and measured, the capacitance value of the capacitor is calculated according to the voltage value when the current of the capacitor is zero, the influence of ESR can be eliminated, and accurate detection of the capacitance value can be achieved in real time.

Devices and methods for measuring capacitance of a load. A device may include a ground connector configured to couple to ground and an output connector configured to couple to the load. The device may include a direct current (DC) supply arranged in a conduction path between the ground connector and the output connector wherein the DC supply is configured to apply a DC voltage and noise voltage onto the conduction path. The device may include a voltage monitor configured to monitor the noise voltage applied by the DC supply and the device may include a current monitor configured to measure current in the conduction path that results from the noise voltage. The device may include a capacitance module coupled to the current monitor and voltage monitor, the capacitance module configured to determine the capacitance based upon the monitored current and noise voltage.

The invention discloses a film capacitor enabling control method and system, a medium and a program product, and the method comprises the steps: determining current sampling data and voltage sampling data of a film capacitor in a first time period; calculating an equivalent impedance sequence within a first time length, and determining distribution characteristics of impedance components under different frequencies; dividing a plurality of frequency band intervals, and calculating an impedance change rate matrix in each frequency band interval; determining energy transmission efficiency, and determining a target frequency band interval; generating a compensation coefficient, and adjusting the amplitude and the frequency by using the compensation coefficient to obtain a target sine-wave voltage; performing energizing processing on the thin-film capacitor by adopting the target sine-wave voltage within the remaining time of the energizing duration, and calculating an instantaneous power factor in real time; and when the stability of the instantaneous power factor reaches a preset condition and the leakage current is reduced below a preset threshold value, generating an enabling completion signal. According to the invention, the adaptability between the energizing effect and the actual demand of the thin film capacitor is improved, and the energizing effect is further improved.

The invention discloses a CVT internal capacitance state comprehensive evaluation method and system based on temperature compensation, and belongs to the field of capacitor voltage transformer optimization compensation, and the method comprises the following steps: S1, detecting the primary voltage amplitude and phase angle of a capacitor transformer, and obtaining the performance parameters of the capacitor transformer; s2, acquiring environment temperature information; s3, determining a mathematical relationship between the environment temperature and the performance parameters of the capacitance transformer, and calculating a temperature compensation coefficient according to the mathematical relationship and the environment temperature value; s4, compensating a primary voltage amplitude and a phase angle by using a temperature compensation coefficient; and S5, analyzing the compensated voltage amplitude and phase angle data to obtain an analysis result, and evaluating whether the internal capacitance state of the capacitance transformer is normal or not according to the analysis result. By accurately detecting the primary voltage amplitude and the phase angle of the capacitance transformer and combining environment temperature information, the method can calculate an accurate temperature compensation coefficient, so that the influence of temperature change on the performance of the CVT is effectively corrected.

The invention discloses a method for evaluating deformation of a transformer winding based on a frequency response-impedance-capacitance comprehensive model. Characteristic indexes are obtained through loss testing, direct measurement and a low-voltage impedance method, collaborative diagnosis is conducted through a frequency response method, an impedance method and a capacitance method, a diagnosis model is established, and therefore the specific position and type of a fault are obtained. According to the method, three methods are comprehensively utilized to evaluate the transformer winding, and the problems that an existing transformer winding deformation state evaluation method is single, limited in data and inaccurate in evaluation result are solved.

The invention discloses a multi-range capacitor capacitance value measuring circuit and method based on constant current state charging and discharging, and relates to the technical field of capacitor testing. The circuit comprises a power supply module, the output end of which is electrically connected with one end of a capacitor to be tested; the input end of the resistance shunting module is electrically connected with the other end of the capacitor to be measured; the input end of the integration module is electrically connected with the output end of the resistance shunting module; the input end of the sampling module is electrically connected with the output end of the integration module; the control module is electrically connected with the power supply module, the resistance shunting module, the integration module and the sampling module; and the first input end of the adjustable window threshold comparison module is electrically connected with the output end of the integration module, and the second input end of the adjustable window threshold comparison module is electrically connected with the control module. According to the circuit provided by the embodiment of the invention, multi-range capacitance value testing can be realized.

The invention relates to the technical field of electrical mechanical parameter measurement, in particular to a slip ratio measurement method of a three-phase asynchronous motor. The method comprises the following steps: carrying out temperature gradient analysis and copper loss temperature rise ratio calculation on the three-phase asynchronous motor to obtain a thermal feature vector; carrying out air gap area capacitance measurement on the motor stator to obtain a fusion capacitance signal; performing rotor period feature extraction on the fused capacitance signal to obtain a rotor slot frequency feature spectrum; performing thermal field-capacitance field characteristic correlation on the thermal characteristic vector and the rotor slot frequency characteristic spectrum to obtain a characteristic correlation matrix; performing double-field reliability weight dynamic allocation under different working conditions according to the feature correlation matrix to obtain a fusion credibility index; and calculating an initial slip rate estimated value based on the thermal feature vector and the rotor slot frequency feature spectrum to obtain a dual-source slip rate value. According to the invention, the precision and accuracy of slip ratio measurement in a variable-temperature environment are significantly improved through an electrical mechanical parameter measurement technology.

A capacitive sensor and capacitive sensing method including driver device having first input configured to receive clock signal, second input configured to receive charging voltage, third input configured to receive common-mode voltage, and output; first capacitor configured to be sensed, having first terminal connected to output of driver device and second terminal; and receiver device having first input configured to receive clock signal, second input connected to second terminal of first capacitor, and third input configured to receive the common mode voltage, wherein the receiver includes a temperature-compensated analog-to-digital converter (ADC), wherein the temperature-compensated ADC includes a voltage reference generator, and wherein the voltage reference generator includes a comparator, a first p-channel Metal Oxide Semiconductor (MOS) transistor, a second p-channel MOS transistor, a third p-channel MOS transistor a first variable resistor, a second variable resistor, a third variable resistor, a fourth variable resistor, a first diode, and a second diode.

A method and system for measuring distribution network system parameters based on harmonic injection, for use in a low-current grounding system containing an arc suppression coil. The system injects currents of multiple frequencies into the neutral point of the low-current grounding system through an injection source and measures the neutral point voltage. The system uses formulas to calculate and obtain the line capacitance, arc suppression coil inductance, and damping resistance parameter values ​​in the distribution network system. This application can accurately measure line capacitance, arc suppression coil damping resistance, and reactance by injecting only two frequencies of current. This method has little impact on grid operation, high measurement accuracy, and broad application prospects.

The invention provides a rapid detection and diagnosis method and system for a short-circuit fault of a transformer winding, and relates to the technical field of transformers, and the method comprises the steps: collecting the electrical parameters of the transformer winding, calculating equivalent impedance, building a transfer function model and an equivalent impedance model, and extracting a frequency domain fault characteristic quantity and a short-circuit force characteristic; and constructing a characteristic quantity judgment matrix to obtain a weight coefficient, carrying out multi-source information fusion by utilizing a D-S evidence theory, and realizing fault diagnosis by combining fuzzy comprehensive evaluation. The method can accurately identify the short-circuit fault type of the transformer winding, and improves the reliability and accuracy of fault diagnosis.

The invention discloses a systematic monitoring method for the electrical safety performance of a cable, and relates to the field of electrical safety, and the method comprises the steps: collecting sensor data to an edge calculation node, preprocessing the data, and outputting the data as real-time calculation temperature data, local discharge point data, resistance and capacitance data and vibration data; the data are sent to a hidden danger classification model and a fault positioning model in the cloud, and the models output early warning information to an operation and maintenance project for processing; the sensor data sending process is judged according to the data frequency, when it is judged that the frequency is larger than 1 kHz, a 1D-CNN electric arc detection model is loaded, when it is judged that the frequency is smaller than 1 kHz, a Light GBM feature classification model is loaded, and 24-hour sensor data smaller than 1 kHz are periodically loaded into an LSTM-Attention gradient analysis model; and related data of partial discharge generated by judgment of the 1D-CNN arc detection model is sent to an LSTM-Attention gradient analysis model for evaluating the partial discharge trend of the global cable. Classification model output is used as prior knowledge of a positioning model, and the positioning accuracy can be improved.

Provided are a circuit and method for measuring capacitance and capacitance-voltage characteristics of a microelectronic device. The circuit includes a pulse generation sub-circuit, a sub-circuit P, and a sub-circuit N. The pulse generation sub-circuit generates clock pulses CLK1 and CLK2 with non-overlapping active levels. The sub-circuit P includes a first current mirror, a first large capacitor, a first transmission gate, a second transmission gate, a first OR gate, a first AND gate, a first NOT gate, a second NOT gate, and a third NOT gate. The sub-circuit N includes a second current mirror, a second large capacitor, a third transmission gate, a fourth transmission gate, a second OR gate, a second AND gate, a fourth NOT gate, a fifth NOT gate, a sixth NOT gate, and a seventh NOT gate.

The technology described herein is directed towards a capacitor with a modified design (relative to standard capacitors), in which a first conductor is coupled to a second conductor via a distributed array of conducting interconnects through a dielectric that separates the conductors. The array of interconnects facilitates electrical surface current flow between the first conductor and the second conductor, and determines the self-resonant frequency of the capacitor. The array (or enlarged area) of conducting interconnects, not present in standard capacitors, results in capacitors with larger self-resonant frequency, e.g., having a substantially stable capacitance over a range of high radio frequencies, including millimeter wave frequencies. This further provides an improved quality factor. The improvements resulting from the technology described herein facilitate more optimal surface current density. The modified capacitor provides benefits in various circuits, e.g., in an impedance or a millimeter wave frequency phase shifter for antenna elements.

A method of testing a display apparatus using a touch sensor and a touch integrated circuit is presented. The touch sensor includes a driving electrode line and a detection electrode line, and the touch integrated circuit includes a signal driving unit and a signal detection unit. The method includes sensing a first mutual capacitance of predetermined test coordinates by applying a first driving signal to the driving electrode line and receiving a detection signal from the detection electrode line, sensing a second mutual capacitance of the predetermined test coordinates by applying a second driving signal to the driving electrode line and receiving a detection signal from the detection electrode line, and determining whether a touch operation is performed based on a difference between the first mutual capacitance and the second mutual capacitance.

A capacitance measurement circuit includes an analog front-end (AFE) circuit with current mirror circuits, a parasitic capacitor, an AD converter, an output shift register, and a controller. The controller disconnects a capacitor to be measured and connects one current mirror circuit to record an AFE output voltage VN collected at an inverting input terminal of the AD converter, then connects the capacitor to be measured to collect an AFE output voltage VP at a non-inverting input terminal of the AD converter, and converts a value of (VP−VN) into a first digital signal; determines, based on the value of the first digital signal, a connection number m of the current mirror circuits, controls the analog front-end circuit to connect m current mirror circuits, and repeat the steps to obtain a second digital signal; and shift the second digital signal based on the connection number m to obtain a capacitance measurement value.

The invention discloses an energy storage battery cell test automatic sample loading method based on a mechanical arm, and relates to the technical field of automation. The mechanical arm control unit calculates an obstacle avoidance track used for grabbing the battery cell according to the battery cell space parameters; the mechanical arm tool end moves to the position above the battery cell according to the obstacle avoidance track, and vacuum adsorption is executed to grab the battery cell; after grabbing is completed, the mechanical arm tool end conveys the battery cell to a test area, and a test ready signal is output; when the control system receives a test ready signal, testing the electric capacity and the resistance value of the battery cell; and after the test is completed, the mechanical arm tool end carries the battery cell to a corresponding storage station according to the classification of the test result, and automatic sample loading of the battery cell test is completed. The whole process of grabbing, carrying, testing and classified storage of the battery cells is automatically completed through the mechanical arm, manual intervention is reduced, and the production efficiency is remarkably improved.

Provided is a sensor controller that controls an operation of a touch sensor that detects a position of a passive pointer. The sensor controller includes a transmission circuit transmitting a transmission signal in a third period at a predetermined cycle, the third period including a first period and a second period, a processor that measures a level of electromagnetic noise at a frequency associated with each period in the first period and the second period, and that selects, as a scan frequency of the transmission signal in the second period, one of a first predetermined number of frequencies and selects, as backup frequencies of the transmission signal in the first period, a second predetermined number of frequencies fewer than the first predetermined number of frequencies different from the scan frequency, in each third period and according to a measurement result.

The invention relates to a method (10) for assessing a remaining lifetime of an LED gear (20). The method (10) comprises the steps of: supplying (11) a constant current load from an electrolytic capacitor (21) of the LED gear (20); measuring (12) an electrical characteristic of the electrolytic capacitor (21) over time when the constant current load is supplied by the electrolytic capacitor (21); calculating (13) a capacitance of the electrolytic capacitor (21) based on the measured electrical characteristic; and determining (15) a remaining lifetime estimate and / or a reaching of an end of lifetime of the LED gear (20) based on the calculated capacitance.

The invention provides a hydro-generator shaft insulation multi-parameter monitoring method and system, and the method comprises the steps: employing a common excitation proportion method, introducing a high-frequency excitation current source through a grounding brush, loading a high-frequency voltage on the basis of a shaft voltage, respectively detecting an oil film voltage and an insulation pad voltage, and calculating a voltage amplitude ratio, analyzing oil film capacitance and insulation capacitance based on the high-frequency signal; a co-excitation polling method is adopted, high-frequency excitation current paths are sequentially switched through a polling device, high-frequency current flows through different impedance branches, high-frequency and low-frequency voltage signals are separated through a frequency-selecting filter, and oil film impedance and insulation impedance are analyzed; an independent excitation method is adopted, a high-frequency excitation source is independently introduced from a bearing bush, a frequency-selecting filter or an impedance converter is combined, independent measurement of oil film impedance and insulation impedance is achieved, and oil film thickness and insulation parameters are calculated. According to the invention, multi-parameter monitoring of bearing insulation can be realized.

A capacitive sensor device for detecting the presence of a human body part in a detection region of the sensor device is disclosed. The sensor device includes a first sensor electrode with a first electrode section, a second sensor electrode with a second electrode section, and a measuring device for ascertaining a measurement variable, which is based on a current difference between a first current flowing in the first electrode section of the at least one first sensor electrode and a second current flowing in the second electrode section of the second sensor electrode. The measuring device has an electric coil, and the first electrode section of the first sensor electrode and the second electrode section of the second sensor electrode are at least partly arranged relative to each other and relative to the coil in each case and are coupled to the coil.