49 results about "Electrical capacitance meter" patented technology

The invention discloses a lithium battery solid electrolyte interface film forming quality evaluation method. The method comprises the following steps: in a lithium battery formation stage or a circulation process, applying an alternating current disturbance signal with an amplitude of 1-20mV, and collecting full-band electrochemical impedance spectroscopy data in real time; a relaxation time distribution method is adopted to decouple the electrochemical impedance spectrum of the intermediate frequency region; constructing an equivalent circuit model containing SEI film characteristics, and fitting the decoupled electrochemical impedance spectrum curve by the equivalent circuit model; the compactness index of the SEI film is calculated according to the SEI film resistance and the film capacitance, and whether the compactness of the SEI film reaches the standard or not is judged according to the compactness index; and calculating a lithium ion diffusion coefficient by combining the charge transfer resistance and the Warburg diffusion impedance, and evaluating the SEI membrane ion transmission efficiency. According to the invention, non-destructive monitoring is supported, quantitative evaluation of SEI membrane compactness, ionic conductivity and short circuit faults in the module can be realized, and the cycle life and safety of the lithium battery are improved.

The application discloses a lightning arrester phase-to-phase coupling capacitor determination method and device, medium and equipment, relates to the electrical measurement field, and mainly aims to improve the low accuracy of the existing lightning arrester phase-to-phase coupling capacitor determination. Including: obtaining the fundamental wave voltage effective value, the third harmonic voltage effective value, the fundamental wave current effective value and the third harmonic current effective value of each phase target lightning arrester; based on the fundamental wave voltage effective value, the third harmonic voltage effective value, the fundamental wave current effective value and the third harmonic current effective value, constructing a first capacitive current relationship of each phase target lightning arrester under the interference of the fundamental wave phase-to-phase capacitor and a second capacitive current relationship of each phase target lightning arrester under the interference of the third harmonic phase-to-phase capacitor; based on the phase-to-phase coupling capacitor calculation model, the fundamental wave voltage effective value, the third harmonic voltage effective value, the fundamental wave current effective value and the third harmonic current effective value are calculated to obtain the phase-to-phase coupling capacitor between each phase target lightning arrester.

The invention discloses a bus support capacitance calculation method and device, a medium and a product, and relates to the field of power electronics, and the method comprises the steps: firstly, calculating a neutral-point potential fluctuation allowable value according to a three-phase output voltage peak value and a load power factor angle of a three-level inverter; calculating the three-phase output current of the three-level inverter according to the three-phase output current peak value of the three-level inverter; capacitance current flowing through the subintervals is calculated; then calculating the charge cumulant of the bus capacitor in a charging period; and finally, calculating the minimum capacity of the bus capacitor according to the neutral-point potential fluctuation allowable value and the charge cumulant. The technical problem that the capacitance cost and the capacitance volume cannot be effectively reduced due to the fact that the existing method is low in calculation efficiency and difficult to accurately calculate the minimum capacitance capacity on the premise that the output waveform is not distorted is solved.

The invention relates to a charge capacity calculation device and method for an energy storage system. A method of calculating a charge capacity of an energy storage system according to one embodiment of the present invention. The method includes: a current application step of applying a predetermined current having a constant value to the energy storage system; a first voltage measurement step of measuring a voltage of the energy storage system while a predetermined current having a constant value is applied to the energy storage system; a second voltage measurement step of measuring a voltage of the energy storage system after blocking a predetermined current having a constant value applied to the energy storage system; and a resistance (R) and capacitance (C) calculation step for calculating the resistance (R) and capacitance (C) of the energy storage system on the basis of the voltage of the energy storage system measured in the first voltage measurement step, the voltage of the energy storage system measured in the second voltage measurement step, and a predetermined current having a constant value.

A method for performing guided self-examination of a subject's tissues is described. The method includes: positioning a handheld device comprising multiple electrodes and a certain amount of flexible material in general contact with a region of the subject's body; measuring the capacitance between two of the electrodes; calculating tissue parameters based on the capacitance; determining instructions for the subject in a controller based on the tissue parameters; and issuing instructions to the subject to guide the subject in manipulating the handheld device.

The invention provides a cable insulation dielectric constant extraction method, system and device, and belongs to the technical field of cable detection. The method comprises the steps of determining a cable additional capacitance value in a first preset frequency interval based on a cable length ratio corresponding to a to-be-detected cable group; and obtaining a first cable capacitance value and a second cable capacitance value, and determining an additional inductance value based on the cable additional capacitance value, the first cable inductance value and a preset impedance measurement equivalent relation. The preset impedance measurement equivalent relation is constructed by analyzing an impedance measurement result, the impedance measurement result is an impedance imaginary part obtained by measuring a preset cable based on a preset frequency signal, and the frequency of the preset frequency signal is in a second preset frequency interval; the lower bound of the second preset frequency interval is larger than the upper bound of the first preset frequency interval. And based on the additional inductance value, the second cable capacitance value, the second cable inductance value, the cable additional capacitance value and a preset coaxial capacitance calculation formula, determining a cable relative dielectric constant corresponding to the to-be-detected cable group.

Providing an electrostatic coordinate input device capable of accurately determining, depending on the distance from an operation body, whether an operation such as a contact operation, a proximity operation or other operations is being performed and capable of preventing erroneous operations, and a method for determining an operation in the electrostatic coordinate input device. An electrostatic coordinate input device includes an operation surface, a plurality of sensor electrodes arranged on a back side of the operation surface, a measuring circuit configured to measure a capacitance of each of the plurality of sensor electrodes, and a calculation unit configured to calculate a position of an operation body based on the plurality of capacitances measured by the measuring circuit.The calculation unit calculates a largest capacitance between the operation body and the sensor electrodes based on the plurality of capacitances, sets a non-showing determination threshold used to determine a non-showing operation that is not a showing operation of the operation body, and when the number of capacitances exceeding the non-showing determination threshold among the plurality of capacitances exceeds a determination number threshold, determines that the operation of the operation body is the non-showing operation.

A condition monitoring system is provided for a journal bearing arranged to support a rotary component installed in a rotary machine, which condition monitoring system includes a pair of electrical terminals arranged on either side of an oil-filled gap between the journal and the rotary component; a capacitance meter connected across the terminals and configured to output a measurement reading indicative of capacitance across the terminals during operation of the rotary machine; and an evaluation unit to receive readings from the capacitance meter and to determine the health of the journal bearing on the basis of the measurement readings. A method of determining the health of a journal bearing based on capacitance measurement readings across the oil-filled gap between a bearing journal and the supported rotary component is also provided.

The invention discloses a capacitance equivalent modeling method for lightning stroke response of a triangular connection side of a three-phase transformer, and the method comprises the steps: forming a triangular topology for a three-phase coupling network model based on the ground capacitance and turn-to-turn capacitance of a winding at the triangular connection side through node connection, precisely simulating the inter-phase coupling in a lightning stroke transient state, and obtaining the lightning stroke response of the triangular connection side; the method can effectively reflect the high-frequency capacitance characteristics of the triangular connection side of the three-phase transformer, determines the capacitance parameters of the three-phase coupling network model through the frequency domain impedance measurement and capacitance calculation mathematical model, improves the accuracy of the capacitance parameters, provides a more reliable basis for lightning stroke protection design, and improves the reliability of lightning stroke protection design. The technical problem that the prediction precision is insufficient in a high-frequency transient state due to the fact that existing transformer lightning stroke modeling neglects the inter-phase coupling effect in triangular connection of a three-phase transformer and does not fully consider the complex influence of a winding series-parallel connection structure on capacitance parameters is solved.

A system and method for determining a piezoelectric property of a piezoelectric material are disclosed. The system includes a voltage source configured to apply a first voltage across the piezoelectric material during a first time period. A mass sensor is operatively coupled to the material to measure an apparent mass thereof, and a capacitance meter is configured to measure a capacitance of the material during the same time period. A processor, communicatively coupled to the mass sensor and the capacitance meter, is configured to calculate a first value indicative of a piezoelectric property, such as a piezoelectric coefficient (d33 or d31), based at least in part on the measured apparent mass and the measured capacitance. By utilizing these concurrent measurements, the system can determine an effective thickness of the material under an applied electric field, circumventing prior art assumptions and enabling a more direct and physically accurate characterization.

The application relates to the field of integrated circuit design, and discloses a method, device and equipment for extracting a capacitance value, wherein the method comprises the following steps: determining a combined capacitance matched with each sidewall offset based on the relative position relationship between adjacent first and second metal layers in a pre-generated capacitance query table; wherein the sidewall offset of one side of the two adjacent metal layers represents the offset of a group of sidewalls of one metal layer on the side of another metal layer; calculating the surface capacitance component of the first and second metal layers based on a preset unit surface capacitance and the projection overlap width between the first and second metal layers; and calculating the capacitance value between the first and second metal layers according to the surface capacitance component and the combined capacitance matched with each sidewall offset. The technical scheme provided by the application can improve the extraction efficiency of the parasitic capacitance of the metal layer.

This utility model discloses a real-time clock circuit and a Beidou receiver, relating to the field of electronic circuit technology. The disclosed real-time clock circuit includes an energy storage module and a timing module. The energy storage module includes at least one electrolytic capacitor, which has a porous anode substrate structure and a dielectric constant higher than a preset dielectric constant. The timing module is connected to both the electrolytic capacitor and a power supply. This utility model utilizes the electrolytic capacitor to store energy when connected to a power supply, receiving the output voltage from the power supply and outputting the stored energy voltage to the timing module when the power supply is disconnected. The porous anode substrate structure of the electrolytic capacitor, with a dielectric constant higher than a preset dielectric constant, enables the storage of more energy in a short time, ensuring longer time recording even after the Beidou receiver is powered off, thus providing a reliable time reference for the long-term operation of the Beidou receiver.

The present disclosure relates to an apparatus for measuring an insertion depth of medical instruments inserted into a body and a method for measuring an insertion depth of medical instruments inserted into a body. The apparatus for measuring an insertion depth of medical instruments inserted into a body includes: a non-metallic protective container that is inserted into a body with a medical instrument disposed therein; a pair of main electrodes having a predetermined area and formed in a longitudinal direction while facing each other in the protective container; and a controller electrically connected to the pair of main electrodes, measuring capacitance that is induced by the pair of main electrodes, and calculating an insertion depth of the medical instrument inserted into a body on the basis of the measured capacitance.

This system provides a DC insulation resistance monitoring system whose measurement results are less susceptible to external noise. [Solution] A DC insulation resistance monitoring system for a high-voltage distribution system, comprising: a neutral point switch for a grounded instrument transformer; an insulating capacitor switched on and off by the neutral point switch; a DC power supply for charging the insulating capacitor; a switch for switching the connection between the DC power supply and the insulating capacitor; and a voltage measuring unit for the insulating capacitor. The voltage measuring unit measures and holds the drift voltage Vd of the insulating capacitor, measures and holds the peak voltage Vp of the insulating capacitor, measures and holds the capacitor voltage Vt after a certain time t has elapsed since the DC power supply was turned off after charging the insulating capacitor with the DC power supply, calculates the voltage discharge time constant of the insulating capacitor as (Vp-Vd) / (Vp-Vt)×t, and calculates the insulation resistance R as T / c using the capacitance C of the insulating capacitor.

This invention relates to the field of electrical performance testing technology for nanoscale thin films, and in particular to a method for testing the dielectric constant and Q value of nanoscale thin films using a network analyzer. The method includes the following steps: S1: Preparing electrodes on the surface of the thin film to be tested, and forming a capacitor with the film; S2: Connecting the electrodes to the network analyzer using a probe station, and performing impedance matching on the circuit before connection; S3: Measuring the resonant frequency of the thin film under test at different frequencies and the S21 parameter at those resonant frequencies; S4: Calculating the capacitance and Q value of the thin film at different frequencies using the S parameters measured in S3; S5: Calculating the dielectric constant of the thin film at different frequencies using the capacitance obtained in S4. This invention has the advantage of simultaneously measuring the Q value of the thin film; and it can be tested at GHz frequencies, offering the advantage of high testing frequency. This invention achieves simultaneous testing of the dielectric constant and Q value of nanoscale thin film dielectrics, featuring accurate test results and high testing frequency.

Provided is an inspection device and an inspection method that easily correct a variation in electrostatic capacitance caused by a manufacturing variation in a substrate. The substrate inspection device is an inspection device that inspects a plurality of substrates on which wiring and reference wiring are formed, and includes: a measurement unit that measures electrostatic capacitance of the wiring and the reference wiring of each substrate as a measurement capacitance; an average capacitance calculation unit that calculates an average value of the measurement capacitance measured from the reference wiring that is designed to be the same wiring as the average capacitance; and a capacitance correction unit that, in a case where one of the plurality of substrates is taken as a target substrate, calculates a correction value of the measurement capacitance of a target wiring that is an inspection target of the target substrate, that is, a correction capacitance, and calculates the correction capacitance by multiplying a ratio of the average capacitance of the wiring of the target substrate to the measurement capacitance by the measurement capacitance of the target wiring.

Provided is a contact determination method in which a sheet-like electrode part 20, which is constituted by layering a first electrode 21 and a second electrode 22 with an insulator therebetween, is provided so as to cover an outer peripheral part of a steering wheel 10, and in which determination of contact of a driver with the steering wheel 10 is performed on the basis of an electrical signal detected from the electrode part 20. The contact determination method comprises: a detection step for detecting an electrostatic capacitance generated in the electrode part 20; a determination step for comparing a determination value calculated from the electrostatic capacitance detected in the detection step with a determination threshold to determine whether the steering wheel is in a hands-on state in which a hand of the driver is in contact with the steering wheel 10 or in a hands-off state in which the hand of the driver is not in contact with the steering wheel 10; and a setting step for setting the determination threshold on the basis of a determination initial value of the determination value in the hands-off state. In the setting step, when the determination value exceeds the determination threshold and then the determination value decreases and becomes a fixed value different from the determination initial value, the determination initial value is updated to the fixed value and the determination threshold is set on the basis of the updated determination initial value.

The invention provides a super capacitor internal resistance detection method. The method comprises the following steps: recording two times of trigger point accumulated charge and discharge capacity, two times of trigger point current values and two times of trigger point voltage values; when the difference value of the current values of the two triggering points exceeds a first threshold current, calculating the difference value of the accumulated charge and discharge capacities of the two triggering points, and calculating a voltage change value caused by the charge and discharge capacities of the two triggering points through a rated capacitor; calculating the internal resistance voltage of the super capacitor according to the obtained voltage change value caused by the charging and discharging capacities of the two triggering points and the voltage values of the two triggering points; and calculating the internal resistance of the super capacitor according to the obtained internal resistance voltage of the super capacitor and the two trigger current values. According to the super-capacitor internal resistance detection method provided by the invention, the internal resistance of the single super-capacitor is detected through the super-capacitor management system, and the influence of the voltage change of the single super-capacitor caused by the capacitance change of short-time large-current charging and discharging is considered, so that the detected internal resistance value of the super-capacitor is more accurate.

The application relates to a kind of gas pipeline evaluation method and device, the method comprises: current signal is emitted to gas pipeline by transmitter, and the current value at detection position is obtained;According to the current value of emission position and the current value of the detection position, the current attenuation coefficient of the gas pipeline is calculated;According to the current attenuation coefficient, current frequency, self-induction of the gas pipeline, longitudinal resistance of the gas pipeline and the capacitance between the gas pipeline and ground, the transverse resistance of the gas pipeline is calculated;According to the transverse resistance of the gas pipeline and the diameter of the gas pipeline, the insulation characteristic parameter of the gas pipeline is calculated;According to the size relation between the insulation characteristic parameter and preset threshold value, whether the gas pipeline leaks is determined.The application can judge whether the gas pipeline leaks, and the process does not involve human factors, so the accuracy of the judgment result is relatively high.

The present invention discloses a wearable device capable of correcting biometric information, comprising: a substrate; a first motion sensing area comprising a first electrode located on the substrate; a second motion sensing area comprising a second electrode, wherein a shielding layer is provided on the second electrode and the second electrode is located between the shielding layer and the substrate, and when a user wears the wearable device, the user causes a greater capacitance change to the first electrode and a smaller capacitance change to the second electrode; a capacitance calculation circuit coupled to the first electrode for calculating the capacitance change generated by the first electrode or the second electrode; and an action judgment circuit for judging the action of the wearable device based on the capacitance change of the first electrode or the capacitance change of the second electrode. The present invention also provides a biometric information measurement system, which can more accurately measure biometric information and accurately judge movement through different motion sensing areas.

The invention discloses a transformer capacitance calculation method. The method comprises the steps of firstly obtaining a corresponding relation between a first basic capacitor bank of a transformer product and a first technical parameter of the transformer product; obtaining a second basic capacitor group of the target transformer according to a second technical parameter of the target transformer and the corresponding relation; and combining the capacitance values in the second basic capacitor bank of the target transformer to obtain the required capacitance data of the target transformer. The transformer capacitance calculation method is rapid in calculation process, high in result accuracy and capable of meeting the timeliness requirement. The invention also provides a transformer capacitance calculation system and a power generation system construction method.

The invention relates to a condition monitoring system. The present invention describes a condition monitoring system for a journal bearing arranged to support a rotating component mounted in a rotating machine, the condition monitoring system comprising: a pair of electrical terminals respectively arranged on both sides of an oil-filled gap between the journal and the rotating component; a capacitance meter connected between the terminals and adapted to output a measurement reading indicative of a capacitance between the terminals during operation of the rotating machine; and an evaluation unit adapted to receive readings from the capacitance meter and determine a health of the journal bearing based on the measured readings. A method of determining the health of a journal bearing based on capacitance measurement readings across an oil charge gap between a bearing journal and a supported rotating component is also described.

The application provides a super capacitor internal resistance detection method, comprising the following steps: recording the cumulative charge and discharge capacity of two trigger points, the current value of two trigger points and the voltage value of two trigger points; when the difference of the current value of two trigger points exceeds the first threshold current, calculating the difference of the cumulative charge and discharge capacity of two trigger points, and calculating the voltage change value caused by the charge and discharge capacity of two trigger points through the rated capacity; according to the obtained voltage change value caused by the charge and discharge capacity of two trigger points and the voltage value of two trigger points, calculating the internal resistance voltage of the super capacitor; and according to the obtained internal resistance voltage of the super capacitor and the trigger current value, calculating the internal resistance of the super capacitor. The super capacitor internal resistance detection method provided by the application considers the influence of the capacitor change caused by the short-time large-current charge and discharge on the voltage change of the super capacitor single body, so that the detected internal resistance value of the super capacitor is more accurate.

The present application provides a test method and a test device for a capacitive touch sensing circuit. The capacitive touch sensing circuit includes: a dielectric layer, a touch sensing unit, and a capacitive touch sensing electrode. The dielectric layer is mounted on the capacitive touch sensing electrode. The method includes: when there is no external electric field, measuring, by the touch sensing unit, a reference charge required for the capacitive touch sensing electrode to reach a preset voltage; applying a preset external electric field to the capacitive touch sensing circuit by an external test circuit, and measuring, by the touch sensing unit, a test charge required for the capacitive touch sensing electrode to reach the preset voltage; calculating, according to the test charge, the reference charge, and the preset voltage, a to-be-tested inductive capacitance of the capacitive touch sensing circuit; measuring, in the same external electric field, a standard inductive capacitance of a preset capacitive touch sensing standard circuit; and calculating a comparison deviation value according to the to-be-tested inductive capacitance and the standard inductive capacitance to determine whether the capacitive touch sensing circuit passes the test.

The invention discloses a capacitance calculation method for power transmission line icing monitoring, and relates to the technical field of power transmission line on-line monitoring, and the method comprises the steps: obtaining a simulation model of an ice viewer device through building a basic model which enables a single three-electrode array to be equivalent to two circular ring capacitors connected in parallel; according to a parallel plate edge effect and an electric field theory, establishing an edge capacitance calculation model of the circular ring capacitor; combining the parallel plate capacitance calculation model and the edge capacitance calculation model to obtain a capacitance calculation model of the single circular ring capacitor; introducing the capacitance calculation model of the single circular ring capacitor and the mutual capacitance among the adjacent three-electrode arrays into the simulation model to obtain a capacitance calculation model of the cylindrical multi-electrode array; and substituting the dielectric constant into a capacitance calculation model of the cylindrical multi-electrode array to obtain a capacitance value of the cylindrical multi-electrode array, so that the capacitance value of the cylindrical multi-electrode array in the icing environment can be accurately calculated.

Since a steering wheel unit inevitably has an area where a sensor cannot be placed due to construction and design limitations of a steering wheel unit, a steering wheel unit is provided that is capable of determining where there is contact of an operator's hand even in a dead zone where no sensor is present. In the steering wheel unit, when any of the electrostatic capacitances measured by the capacitance meter while a self-capacitance detection mode is set by the mode switch is equal to or greater than a first threshold, it is determined that the operator's hand is in contact with the rim at a position overlapping at least one of the electrodes. When the electrostatic capacitance is equal to or greater than a second threshold, which is smaller than a first threshold, and smaller than the first threshold, the self-capacitance detection mode is switched to the mutual capacitance detection mode. After switching, when the electrostatic capacitance newly measured in the mutual capacitance detection mode is equal to or greater than a third threshold, it is determined that the operator's hand is in contact with the rim at a position overlapping a gap between the electrodes.

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.

Provided is a capacitive non-contact input device capable of smoothly moving a position calculated for displaying a pointer in accordance with the position of an indicator.　The capacitive non-contact input device according to an embodiment of the present disclosure includes: a plurality of sensor electrodes disposed along a plane on a back surface side of an operation surface; a measurement circuit for measuring capacitance between each of the plurality of sensor electrodes and an indicator; and a control unit. The control unit: calculates a measurement position, which is a planar position of the indicator, and a variation in the measurement position, on the basis of the capacitance measured by the measurement circuit; calculates a moving average position, which is a planar position of the indicator, on the basis of the moving average of the measurement position at a plurality of points in time; and when calculating the moving average position, increases a weighting coefficient of the latest measurement position in the moving average as the variation decreases.

This invention discloses a method for evaluating the quality of solid electrolyte interphase (SEI) film formation in lithium-ion batteries. The method includes: applying an AC perturbation signal with an amplitude of 1-20 mV during the lithium-ion battery formation stage or cycling process, and real-time acquisition of electrochemical impedance spectroscopy (EIS) data across the entire frequency band; decoupling the mid-frequency EIS using the relaxation time distribution method; constructing an equivalent circuit model incorporating SEI film characteristics, which is then fitted to the decoupled EIS curve; calculating the SEI film compactness index based on the SEI film resistance and capacitance, and using the compactness index to determine whether the SEI film compactness meets the standard; and calculating the lithium-ion diffusion coefficient by combining charge transfer resistance and Warburg diffusion impedance to evaluate the SEI film ion transport efficiency. This invention supports non-destructive monitoring and enables quantitative assessment of SEI film compactness, ion conductivity, and short-circuit faults within the module, thereby improving the cycle life and safety of lithium-ion batteries.

Disclosed herein are package interfaces with improved impedance continuity. An illustrative embodiment of a packaged integrated circuit includes an integrated circuit chip having a SerDes signal pad, and a package substrate having a core via and an arrangement of micro vias connecting the SerDes signal pad to an external contact for a solder ball connection to a PCB trace. The core via has a first parasitic capacitance, the solder ball connection is associated with a second parasitic capacitance, and the arrangement of micro vias provides a pi-network inductance that improves the connection impedance match. An illustrative method embodiment includes obtaining a desired impedance of a PCB trace, determining parasitic capacitances of a core via and a solder ball connection to the PCB trace, minimizing the core via capacitance, calculating a pi-network inductance that improves the impedance match to the PCB trace, and adjusting the micro via arrangement between the core via and the solder ball connection to provide the pi-network inductance.