267results about "Capacitance measurements" patented technology

The invention discloses a cable high-frequency impedance characteristic analysis method based on bipolar trapezoidal wave excitation, and belongs to the technical field of power equipment state monitoring and fault diagnosis. In order to solve the problems of low test efficiency, insufficient high-frequency parameter modeling precision and weak anti-interference capability in cable high-frequency impedance characteristic analysis of a traditional sine wave excitation method, the method comprises the following steps: generating an odd-symmetry bipolar trapezoidal wave excitation signal with specific frequency and amplitude, and injecting the signal into the head end of a cable to be tested through a coupling device after power amplification; synchronously acquiring a high-frequency response signal of the key position of the cable under the excitation of the bipolar trapezoidal wave by using a data acquisition system; preprocessing the high-frequency response signal, converting the high-frequency response signal into a frequency domain through Fourier transform, calculating input impedance of the cable under different harmonic frequencies, and synthesizing a broadband impedance spectrum; based on the broadband impedance spectrum, the amplitude-frequency characteristic and the phase-frequency characteristic of impedance are analyzed, and cable state evaluation, partial discharge detection, insulation defect diagnosis or fault point positioning are realized. The method is used for an electric power system.

Systems and Methods for capacitance testing of a unit under test with parasitic capacitance directed to a guard rail. The system includes test points, wherein the plurality of test points are divided into at least two groups; a stimulus source; a first group guard relay electrically connected to each of the test points in a first; a second group guard relay electrically connected to each of the test points in a second; a guard rail coupled to the first group guard relay and the second group guard relay; a first group return relay electrically connected to each of the test points in a first group; a second group return relay electrically connected to each of the test points in a second group; a current measurement rail coupled to the first group return relay and the second group return relay; a current meter coupled to the measurement rail; and a controller.

The invention provides a transformer DC capacitor state monitoring device and method based on an FPGA, and relates to the technical field of capacitor state monitoring. The device comprises a voltage acquisition module used for synchronously acquiring voltage analog signals at two ends of a DC capacitor in a plurality of MMC modules and performing analog-to-digital conversion; the current acquisition module is used for synchronously acquiring bridge arm current analog signals of a plurality of MMC modules and performing analog-to-digital conversion; the master control FPGA module is respectively connected with the voltage acquisition module and the current acquisition module, and is used for receiving and caching the digitized voltage signal and current signal, respectively calculating a real-time capacitance value of a direct-current capacitor in each MMC module based on a parallel sliding window and a hardware acceleration real-time capacitance value tracking algorithm, and outputting the real-time capacitance value of the direct-current capacitor in each MMC module; the degradation state of each direct-current capacitor is evaluated according to the real-time capacitance value; and the communication module is connected with the master control FPGA module and is used for uploading the degradation state data to an upper computer. According to the method, the real-time performance of monitoring can be remarkably improved while the calculation precision is ensured.

The invention is suitable for the technical field of circuit monitoring, and provides a capacitance value online monitoring method and system based on thin film capacitor self-healing feature perception, and the method comprises the steps: synchronously collecting a voltage signal and a current signal of a to-be-detected thin film capacitor based on a preset sampling period, and constructing a voltage sequence and a current sequence with a unified time sequence; determining a candidate transient time window based on a preset sampling period and the voltage sequence; in the candidate transient time window, a time sequence of a self-healing event is determined based on the voltage sequence and the current sequence, and the self-healing event comprises an arcing stage, an arc quenching stage and a charging recovery stage; and based on the initial voltage, the final voltage and the effective charging current in the charging recovery stage, determining an effective capacitance estimation value of the to-be-tested thin-film capacitor. According to the technical scheme provided by the invention, the self-healing behavior of the thin-film capacitor is accurately identified, so that online monitoring of the capacitance value of the thin-film capacitor is realized, and the capacitance value monitoring error is effectively reduced.

The invention relates to the technical field of electronic measurement and sensing, and discloses a capacitance monitoring method and system based on a sweep frequency resonance point, and the method comprises the steps: carrying out the coarse sweeping in an initial frequency range, obtaining an impedance spectrum, and recognizing a coarse resonance interval; carrying out fine scanning in the interval and calculating an accurate resonant frequency by adopting a quadratic interpolation method; calculating a capacitance value in combination with the mapping table; and dynamically adjusting the frequency sweeping window of the next period based on the historical resonant frequency. The system comprises an excitation signal generation unit, an impedance response acquisition unit, a coarse / fine scanning control unit, a resonant frequency calculation unit, a capacitance resolving unit and a dynamic frequency window updating unit, and integrates a temperature compensation and anomaly detection mechanism. Through the two-stage frequency sweeping and self-adaptive frequency window strategy, the monitoring period is shortened to 1 / 5 or below of that of a traditional method while it is guaranteed that the resonant frequency measurement precision is superior to 0.01 Hz, and the real-time performance, stability and environmental adaptability are remarkably improved.

A semiconductor device apparatus is provided. The apparatus includes a packaged semiconductor device mounted on a substrate. The packaged semiconductor device includes a semiconductor die having a controller configured to obtain a measured capacitance of a sensor capacitor, an encapsulant encapsulating the semiconductor die, and a first plate of the sensor capacitor formed at a bottom side of the packaged semiconductor device. A second plate of the sensor capacitor is formed at a top side of the substrate.

The invention discloses an electronic device test fixture and a test system, and relates to the technical field of capacitance detection. The electronic device test fixture comprises a sample mounting unit and a test switching unit, the sample mounting unit comprises a test piece connecting part and a test signal interface, and the test switching unit comprises a signal input interface and a signal output interface. Wherein the test piece connecting parts are used for connecting electronic devices, the plurality of test piece connecting parts of the sample mounting unit are adapted to at least two electronic devices of different specifications, and a plurality of mutually independent conductive paths are formed between the test switching unit and the plurality of test piece connecting parts. And the test switching unit is used for transmitting a test electric signal received by the signal input interface to an electronic device loaded on the sample mounting unit. The test fixture can test the reliability of electronic devices of one or more specifications, and improves the test efficiency of the reliability of the electronic devices.

The invention belongs to the field of photovoltaic technology, and provides a multifunctional photovoltaic packaging adhesive film, a preparation method thereof and a photovoltaic module monitoring system. The multifunctional photovoltaic packaging adhesive film is of a co-extruded multi-layer composite structure and comprises a functional layer, a barrier layer and a base layer which are sequentially stacked, the functional layer comprises the following raw material components: a polyolefin matrix, a light conversion agent, a self-repairing microcapsule, a stress luminescent material, optical waveguide fibers and other auxiliaries which are matched according to a specific mass ratio; the barrier layer is a transparent conductive layer and comprises the following raw material components: a polyolefin matrix and a conductive material which are matched according to a specific mass ratio; the base layer comprises the following raw material components: a polyolefin matrix, an anti-PID auxiliary agent and other auxiliary agents which are matched according to a specific mass ratio. Through cooperation of all the layers, the multifunctional photovoltaic packaging adhesive film which integrates light conversion energy, power generation power gain, self-repairing (service life prolonging), PID resistance improvement, power attenuation reduction after PID aging, damage state sensing and visualization and other functions can be obtained.

An analyte in a liquid sample is detected using a capacitive sensor having electrodes and a sensor surface, and a signal processor. The sample is dried to reduce its liquid content, and capacitive measurements are made after the drying and preferably also before the drying. The sample may include particles, and the analyte is part of or attached to the particles, and the particles provide a major part of the capacitance change compared to absence of particles. In another example the particles are degenerative and form an integral mass upon application of heat, enhancing the extent of capacitance change.

A system and method for compensating for drift in a switch gear voltage sensor. The system includes a circuit, and an electronic processor. The circuit is configured to receive a first signal from a first capacitor of the voltage sensor and receive a second signal from a second capacitor of the voltage sensor. The circuit is further configured to generate a third signal and a fourth signal based on the first signal and the second signal. The electronic processor is configured to receive the third signal and the fourth signal and determine an angular frequency, a phase difference, a resistance value, a voltage across a compensation capacitor, an initial gain, a capacitance of the second capacitor, a capacitance and a voltage of the compensation capacitor, and a final gain.

The present invention relates to a substrate processing equipment, and more particularly, to a substrate processing equipment equipped with a current, voltage and power measurement module for measuring the current / voltage applied for generating and maintaining plasma, and further for measuring the power of incident and reflected waves. The present invention discloses a substrate processing equipment comprising a process chamber, a substrate support unit, a gas injection unit, and at least one RF power source. The substrate support unit includes a heater and an RF energy blocking part installed above the heater. A current, voltage and power measurement module is installed adjacent to a grounding wire, which is connected to the RF energy blocking part, to measure the RF voltage, current, and power of an incident wave and a reflected wave generated by the plasma.

Systems and Methods for capacitance testing of a unit under test with parasitic capacitance directed to a guard rail. The system includes test points, wherein the plurality of test points are divided into at least two groups; a stimulus source; a first group guard relay electrically connected to each of the test points in a first; a second group guard relay electrically connected to each of the test points in a second; a guard rail coupled to the first group guard relay and the second group guard relay; a first group return relay electrically connected to each of the test points in a first group; a second group return relay electrically connected to each of the test points in a second group; a current measurement rail coupled to the first group return relay and the second group return relay; a current meter coupled to the measurement rail; and a controller.

The application discloses a kind of Buck converter operating state online detection methods under CCM mode, parallel a known capacity capacitor at the output of Buck converter, collect the output voltage ripple before parallel capacitor and the output voltage ripple after parallel capacitor, then combine the average value of output voltage, the parameter of output filter capacitor can be calculated, and the performance of switching power supply will not be affected by parallel capacitor;Without additional excitation auxiliary measurement, without disassembling power supply, the operating state of Buck converter can be detected online, and Buck converter is not impacted in any way;In the long-term operation process of Buck converter, the working state and aging condition of Buck converter can be judged according to the parameter of capacitor, to achieve the purpose of Buck converter fault detection.

This invention discloses a contactless chip testing system. The platform includes a PC, a data parsing / forwarding module, a source signal excitation module, a gating array, and a chip slot under test. The platform allows for simultaneous multi-selection via a PC's visual interface, enabling automated integrated testing of resistance, capacitance, package integrity, voltage, and overall power consumption between any chip pins. Compared to traditional mechanical probe-based contact testing systems, this invention is more compact. Furthermore, it employs an automatically gating physical path switching method, resulting in a higher switching rate and more efficient package testing.

The invention relates to a line sensor (200) for being mounted to a power line (1a, 1b, 1c). The line sensor (200) comprises: i) a housing (202) for containing line sensor electronics (210); and ii) a voltage-sensing capacitor (240) in connection with the housing (202). The line sensor (200) is characterized by an electric circuit (600) being connected in parallel with the first capacitance (C1) for receiving a harvested voltage (VH) standing over the two capacitor plates (242, 244), the electric circuit (600) being configured for operating in an energy harvesting mode and / or a voltage-sensing mode. The line sensor (200) is further characterized by a slot antenna (250) being integrated in the first, upper, one (242) of the capacitor plates, wherein in the second, lower, one (242) of the capacitor plates an opening (255) is provided for allowing radio-frequency waves generated by the slot antenna to be transmitted through the opening (255). Thereby a single component multi-purpose structure is formed enabling both the energy harvesting mode and the voltage sensing mode as well as wireless communication with other units.

The invention discloses a measuring circuit and a measuring method for a variable capacitor array, and belongs to the technical field of capacitance measuring circuits, the measuring circuit comprises a controller MCU, a DAC chip, a first logic switch, a capacitance sensor array, a second logic switch, an alternating current amplification circuit and an ADC chip, the controller MCU sends a first alternating current signal through the DAC chip, and the first logic switch sends a second alternating current signal through the ADC chip; a first alternating current signal enters the capacitive sensor array after being switched by the first logic switch, is output to the capacitive sensor array after being switched by the second logic switch, and is converted into a second alternating current signal after passing through the capacitive sensor array. The output second alternating current signal is converted into a voltage signal after passing through the alternating current amplification circuit, the voltage signal is sent back to the controller MCU after being subjected to digital-to-analog conversion through the ADC chip, the controller MCU outputs a measured voltage value, and the capacitance value of the capacitive sensor array is obtained according to the measured voltage value. And through the arrangement of the controller MCU and the logic switch, circuit chips are saved, and the manufacturing cost is reduced.

The invention is suitable for the technical field of cable life evaluation, and provides a cable life evaluation device and method based on interdigital sensing, and the method comprises the following steps: coupling an interdigital capacitor plate to a to-be-measured cable, and measuring values and capacitance values at a plurality of frequencies through an LCR digital bridge; processing the capacitance value by using a KNN algorithm, and judging the damage state of the cable; carrying out linear compensation correction on a measured value by combining prior knowledge of the cable; inputting the compensated and corrected value into a pre-trained DT regression model to obtain an aging degree evaluation result of the cable; and fusing the judgment result of the damage state and the evaluation result of the aging degree, and outputting the residual life pre-evaluation of the cable. According to the method, rapid, lossless and accurate detection of the waste cable is realized, and a reliable basis is provided for recycling and screening of the cable.

The application discloses a kind of based on DC side pre-charging's MMC submodule capacitor monitoring method, the capacitor monitoring method includes the following steps;All submodule capacitors in bridge arm are discharged to zero voltage;Charging is carried out to each submodule in turn;The time constant of RC charging loop is calculated to obtain submodule capacitor capacity value;Distinguish whether each submodule capacitor capacity value is less than threshold value, decide whether the submodule capacitor needs to be replaced, until the pre-charging and capacitor monitoring of all submodules are completed.The application can carry out submodule capacitor monitoring synchronously in the pre-charging link before MMC is put into use, so as to effectively monitor the state of each submodule capacitor and replace the fault capacitor in time.Compared with conventional capacitor monitoring method, the application does not involve additional measurement circuit, sensor and complex control algorithm, avoids heavy calculation burden, and can reduce the influence of measurement error, improve capacitor monitoring precision.

The application relates to an aerosol generating device and an atomization control device thereof, which comprises: a to-be-tested capacitance component which generates a capacitance change according to whether an atomization medium is inserted; the capacitance plates of the to-be-tested capacitance component are arranged along the insertion direction of the atomization medium; a capacitance processing component which analyzes the type of the atomization medium according to the capacitance of the to-be-tested capacitance component and determines the heating control mode of the aerosol generating device according to the type of the atomization medium; and the capacitance processing component is connected to the to-be-tested capacitance component. The to-be-tested capacitance component generates a capacitance change according to whether the atomization medium is inserted, the capacitance processing component analyzes the type of the atomization medium according to the capacitance of the to-be-tested capacitance component and determines the heating control mode of the aerosol generating device according to the type of the atomization medium, the heating control mode is automatically adjusted in combination with the type of the atomization medium, the user does not need to operate a key, and the use convenience is improved.

The power module capacitor capacity estimation method, device, medium and equipment provided by the application calculate the reference voltages of the capacitor voltage sequence in the stable section and the calibration section respectively, establish references in the stable section and the calibration section respectively, determine the reference drift amount, and dynamically correct the original voltage change value based on this to obtain a more accurate target voltage change value. At the same time, the segmented weighted integration is introduced in the processing of the bridge arm current sequence, the current weighted integration is calculated according to the different dynamic characteristics of the transition section and the input stable section, the current integration can more truly reflect the actual energy storage change of the capacitor, and the accuracy of the target current value is further ensured. Finally, the capacity is calculated by using the two optimized key physical quantities, so that the result is closer to the actual state of the capacitor. In this process, through the structured signal segmentation and dynamic correction strategy, the real-time response capability of the capacity estimation method is enhanced while ensuring high estimation accuracy.

The method for monitoring the resonant capacitor state of the medium-voltage direct-current LLC resonant converter comprises the following steps: closing the switch tube S 11 ~S 41 of the full-bridge at the initial moment when the LLC resonant converter is stopped, then turning on the switch tube S 31 and S 41 after the closing process lasts for 500 ns, forming a discharge loop of a resonant cavity independent of the latter stage, then collecting the time sequence data of the resonant current in the resonant cavity, and estimating the resonant capacitor by using a nonlinear parameter identification algorithm, wherein the estimation is sequentially performed by encoding, initializing the population, calculating the individual fitness, selecting the cross variation evolution, and iterative optimization, finally searching for the optimal resonant current estimation value, and calculating the resonant capacitor estimation value based on the corresponding resonant frequency and resonant inductance. The present application estimates the resonant capacitor value based on the discharge curve of the limited sampling data, has low cost and high reliability, and the present application estimates the parameters by using the nonlinear parameter identification algorithm, and has high estimation accuracy.

An energy harvester (RF) to convert incident radio frequency, RF, energy associated with an RF signal to direct current energy comprises a rectifier (5) comprising a pre-storage capacitor (4), wherein said rectifier is arranged to rectify said incoming RF energy (3), storing the RF energy into the pre-storage capacitor (4), followed by an energy transfer unit (6) comprising a storage output capacitor (8), the value of the storage output capacitor (8) is higher than the value of the pre-storage capacitor (4), the energy transfer unit is arranged to transfer said energy from the pre-storage capacitor into the storage output capacitor including a control unit (2).

The invention discloses a self-calibration type capacitor frequency conversion method, which comprises the following steps of: connecting a capacitor to be measured into a charging loop through a switch matrix, charging the capacitor to be measured, transferring charges of the capacitor to be measured to an integrating capacitor, and generating an integrating voltage; inputting the integral voltage into a five-stage ring oscillator so as to convert the integral voltage into a square wave signal, and performing pulse width amplification on the square wave signal through a time amplifier; a calibration engine is introduced, the calibration engine starts calibration by detecting calibration parameters, the current pulse width is obtained by sequentially switching the reference capacitor array to the measurement channel, and the current pulse width is compared with the stored factory calibration value of the reference capacitor; if the comparison deviation exceeds a threshold value, calculating a scale factor, superposing a second-order temperature compensation model on the scale factor, and finally outputting a calibrated capacitance value to be measured; according to the invention, the time-to-digital converter replaces the traditional ADC, and the intelligent switching reference capacitor array and the dynamic temperature compensation algorithm are combined, so that the full-working-condition self-calibration is realized.

The invention relates to a safety airbag module detection method, device and system and a vehicle. The method comprises the steps of controlling an energy storage module to discharge in response to a detection instruction for a safety air bag module, and obtaining a first discharge current of the energy storage module and a first energy storage voltage of the energy storage module; controlling the energy storage module to discharge according to the second discharge current to obtain a second energy storage voltage of the energy storage module; controlling the energy storage module to discharge according to the first discharge current, and determining the discharge time when the voltage variation of the energy storage module meets the time recording trigger condition; controlling the energy storage module to discharge according to the second discharge current to obtain a third energy storage voltage of the energy storage module; and determining the detection parameters of the energy storage module based on the first discharge current, the first energy storage voltage, the second energy storage voltage, the third energy storage voltage and the discharge time, and obtaining the detection result of the airbag module according to the detection parameters, so that the state of the energy storage module can be accurately evaluated to improve the accuracy and reliability of the detection result.

The invention relates to a method for detecting the infiltration state of a lithium ion battery, which comprises the following steps of: performing in-situ electrochemical impedance spectroscopy test on the lithium ion battery in a liquid injection infiltration process to obtain impedance spectroscopy data changing along with infiltration time; performing fitting processing on the impedance spectrum data by using a preset equivalent circuit model; wherein the equivalent circuit model comprises a transmission line model element used for representing the impedance characteristic of the porous electrode; extracting a capacitance value corresponding to the transmission line model element from the fitting result; determining the infiltration state of the lithium ion battery according to the variation trend of the capacitance value along with the infiltration time; wherein the increasing rate of the capacitance value is positively correlated with the infiltration rate of the electrolyte in the lithium ion battery. The invention also relates to equipment for detecting the infiltration state of the lithium ion battery, a medium and a computer program product.

An integrated circuit with power loss protection function, including a bus terminal configured to provide a bus voltage, an energy storage terminal configurable to be coupled to a power loss protection capacitor, a charging circuit coupled between the bus terminal and the energy storage terminal, and a capacitance monitoring circuit. The charging circuit includes a first charging path, and based on the bus voltage, provides a first constant charging current to charge the power loss protection capacitor during a first constant charging period in a startup process of the integrated circuit. The capacitance monitoring circuit monitors the voltage across the power loss protection capacitor in the charging period of the startup process of the integrated circuit to obtain a parameter for calculating the capacitance value of the power loss protection capacitor.

An inspection method of a display apparatus, includes: determining a reference value for sensing electrodes of the display apparatus; measuring a first capacitance corresponding to a mutual capacitance of a first sensing electrode located in a first area from among the sensing electrodes; measuring a second capacitance corresponding to a mutual capacitance of a second sensing electrode located in a second area from among the sensing electrodes; calculating a ratio value of the second capacitance to the first capacitance; and comparing the ratio value with the reference value to determine whether or not the sensing electrodes are defective.

The invention relates to a system and method for pin tilt detection compensation in a low dropout regulator (LDO). In an illustrative non-limiting embodiment, a system on chip (SoC) may include: circuitry; the LDO includes a transistor having a first end coupled to a first voltage rail and a second end coupled to the circuit, where the second end is configured to receive a probe current generated from a second voltage rail, and where the first voltage rail is coupled to a compensation current source, where the compensation current source is coupled to the first voltage rail. The compensation current source is configured to draw a compensation charge equal to or greater than a charge applied on the second end by the detection current.

Large-signal inductance measuring device for performing a measuring operation for measuring an inductance at an electrical energy supply line arrangement operated with a DC voltage, the large-signal inductance measuring device including: a disconnecting switch for electrically disconnecting the first conductor of the energy supply line arrangement; a first series circuit including a first capacitive arrangement and a first diode arrangement; a first measuring device for measuring a first change in voltage after the first conductor is disconnected; a second series circuit including a second capacitive arrangement and a second diode arrangement; a second measuring device for measuring a second change in voltage after the first conductor is disconnected; a third measuring device for measuring a third current on the first conductor before the first conductor is disconnected; and an evaluation device for evaluating the measured first change in voltage, the measured second change in voltage, and the measured third current.

According to a first aspect of this disclosure, an integrated circuit including a current source and a reference capacitor is provided, the integrated circuit being configured to: inject a first current into an external measuring capacitor using the current source, and determine a first time duration in which the resulting voltage on the measuring capacitor reaches a voltage threshold; inject a second current into the reference capacitor using the current source, and determine a second time duration in which the resulting voltage on the reference capacitor reaches the voltage threshold; and detect a change in capacitance on the measuring capacitor using the difference between the first time duration and the second time duration. According to a second aspect of this disclosure, a corresponding measurement method is proposed.