574results about "Capacitance measurements" patented technology

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.

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.

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.

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 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 relates to the technical field of explosion-proof lamp detection, and discloses an anti-disassembly detection method and system for a portable explosion-proof lamp and a storage medium. The method comprises the following steps: arranging a detection contact and a sensor at the detachable structure, and forming a detection loop through a detection module; and collecting total detection data in real time and comparing the total detection data with the initial data to obtain detection change data so as to identify the state of the lamp and the specific disassembled structure. If the disassembly is illegal, light warning is given out, the warning brightness or the flicker frequency is related to the change data, and the disassembled structure is indicated. Initial data can be updated through a reset instruction to adapt to gauge operation. According to the method, accurate detection and positioning of illegal disassembly are achieved, warning is visual, and the use safety and detection flexibility of the explosion-proof lamp are improved.

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.

A system including a plurality of first wires and a plurality of second wires is disclosed. Each second wire overlaps over one or more first wires at a respective overlapping area of one or more first wires. A dielectric material is disposed in a vertical gap at each respective overlapping area forming a capacitance sensor including a first electrode corresponding to a first wire and a second electrode corresponding to a second wire. The first and second electrodes are connected to a positive bias and a negative bias of at least one voltage source, respectively. The system includes at least one processor configured to periodically measure change in respective electric field of each capacitance sensor of a subset of capacitance sensors of a plurality of capacitance sensors, and store data corresponding to periodically measured change in the respective electric field of each capacitance sensor of the subset of capacitance sensors.

The invention relates to the technical field related to bio-electricity signals, in particular to a plant emotion visualization method and device, electronic equipment and a storage medium. The method comprises the following steps: acquiring bio-electricity signals of different parts of a plant in different scenes by adopting a signal amplification circuit; extracting feature vectors of the corresponding bio-electricity signals under different scenes; based on the feature vector, a reinforcement learning algorithm is adopted for classification so as to identify the emotion type of the plant electric signal, and the corresponding relation between the bio-electricity signal and the emotion type is constructed; wherein different emotion types correspond to different scenes; acquiring real-time bio-electricity signals of different parts of the plant; and determining the emotion type of the plant based on the real-time bio-electricity signal and the corresponding relationship, and further determining the actual scene of the plant.

The invention relates to the field of capacitor monitoring, and provides a capacitor quasi-online state monitoring method and system for a wind power converter, and the method comprises the steps: extracting a data slice comprising DC bus voltage, capacitor branch current, housing temperature and output power from a data buffer area; furthermore, output power data is utilized, intelligent screening is carried out through a quasi-steady-state slice trigger, and only effective data with the power average value large enough and the fluctuation small enough are reserved. And for the screened effective data slices, extracting the DC bus voltage and the capacitance branch current, and accurately identifying the voltage, current amplitude and phase information of the main harmonic through fast Fourier transform. Based on the key harmonic data, the complex impedance of the capacitor is calculated, and then the original ESR and capacitance estimation value are calculated. And finally, in combination with the capacitor shell temperature extracted from the same data slice, performing temperature compensation on the original parameters, and outputting a final result capable of truly reflecting the aging state of the capacitor.

The invention discloses a capacitance parameter determination method and device of an iron core sensing device for transformer partial discharge detection, electronic equipment and a storage medium, and belongs to the technical field of sensor design, and the method comprises the steps: obtaining an iron core three-dimensional model of a transformer; performing electromagnetic simulation on the iron core three-dimensional model to generate antenna characteristic parameters of the transformer iron core under each frequency in a preset frequency band; determining a target detection frequency band of the transformer core according to the antenna characteristic parameters; repeatedly executing the parameter adjustment operation of the iron core sensing device until the current test frequency band covers the target detection frequency band, and determining the capacitance parameter of the iron core sensing device; therefore, by implementing the invention, the problem that the capacitance parameters of the iron core sensing device in the prior art are not accurately determined can be solved.

The invention provides a capacitive MEMS device and a manufacturing method thereof. The capacitive MEMS device comprises at least one MEMS chip, each MEMS chip comprises a wafer substrate and a structural layer arranged on the top surface of the wafer substrate, and a first cavity structure is formed in the wafer substrate. The structural layer covers the first cavity structure and comprises a vibrating diaphragm fixed on the top surface of the wafer substrate and a back polar plate which is fixed on the wafer substrate and is spaced from the vibrating diaphragm to form a capacitor, the bottom surface of the wafer substrate is provided with a groove structure which is sunken towards the direction of the structural layer, and the groove structure partially penetrates through the wafer substrate; the first cavity structure penetrates through the groove bottom of the groove structure and the top surface of the wafer substrate along a first direction; the groove structure and the first cavity structure jointly form an air flowing channel, and the groove structure is communicated with the first cavity structure and the outside of the MEMS chip. According to the capacitive MEMS device, balance control over the air pressure in the device is achieved, and the influence of the air pressure on the capacitive MEMS device is avoided.

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.

A method for detecting battery swelling includes: arranging conductors in a region of a battery cell to detect swelling of the battery cell; measuring a capacitance change amount when an arrangement of the conductors changes; and determining whether or not battery swelling has occurred by using a result of the measuring of the capacitance change amount.

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 relates to the technical field of electrical safety monitoring, in particular to a leakage protection system for a low-voltage IT power supply system. Comprising an impedance spectrum identification unit used for constructing an original spectrum data set; calculating a system-to-ground complex impedance spectrum based on the original spectrum data set; a parallel RC equivalent circuit model is applied to decouple the real insulation resistance and the system ground capacitance based on the system ground complex impedance spectrum; the dynamic evaluation unit is used for constructing an insulation health index; calculating a system structure change factor; the trend prediction unit is used for calculating an insulation aging rate based on a time sequence formed by historical real insulation resistance data; the comprehensive risk decision-making unit is used for calculating a comprehensive risk index; and outputting a tripping signal in response to the insulation health index exceeding a preset final protection limit value. The problem of false alarm caused by the fact that a traditional protection device cannot distinguish resistive leakage current and capacitive leakage current is solved, and the protection accuracy is remarkably improved.

The invention discloses a capacitor health degree detection method and equipment, and the method comprises the steps: applying a sine wave test signal to a to-be-detected capacitor, obtaining a current signal and a voltage signal of the to-be-detected capacitor, calculating the phase angle of the to-be-detected capacitor through the current signal and the voltage signal, calculating the equivalent series resistance and capacitive reactance of the to-be-detected capacitor based on the phase angle, and obtaining the health degree of the to-be-detected capacitor. And calculating the capacitance of the to-be-measured capacitor based on the capacitive reactance, calculating the loss tangent value of the to-be-measured capacitor according to the equivalent series resistance and the capacitive reactance, and predicting the health degree of the capacitor according to the equivalent series resistance, the capacitance value and the change of the loss tangent value. Therefore, when the capacitor operates normally, current and voltage signals of the capacitor can be measured actively, and the health degree of the capacitor can be calculated by combining the equivalent series resistance, the capacity and the loss tangent value of the capacitor, so that the health condition of the capacitor can be evaluated more accurately and comprehensively, and early warning and troubleshooting can be carried out on the abnormal capacitor as soon as possible.

The invention discloses a capacitor capacitance value on-line monitoring alarm method and system, and the method comprises the steps: periodically obtaining the real-time current data of a capacitor according to a set collection period, and calculating a normal range of a three-phase current ratio based on a current ratio algorithm in combination with the number of series connection and parallel connection of capacitor units in the capacitor; calculating the current three-phase current ratio according to the actually collected current data, comparing the current three-phase current ratio with the normal range, and if the current three-phase current ratio exceeds the normal range, determining that the state of the capacitor is abnormal; when it is detected that the state of the capacitor is abnormal, a real-time alarm mechanism is triggered immediately, the established alarm rule base is called to generate detailed alarm information, and the detailed alarm information is sent to a user terminal in multiple modes. Compared with the prior art, the method breaks through the limitation of a fixed period, improves the monitoring accuracy, achieves the precise alarm, and facilitates the quick processing of a fault for a user.

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.

The present disclosure relates to the technical field of electronic equipment, in particular to a SAR detection module and method and electronic equipment, the SAR detection module comprises: an induction branch, a detection branch, a SAR sensor and a compensation branch, the induction branch is used for inducting a capacitance signal; a first end of the detection branch is connected with the induction branch, the detection branch inducts environmental noise to generate a first noise signal; the SAR sensor is connected with a second end of the detection branch, the capacitance signal and the first noise signal are transmitted to the SAR detection unit through the detection branch; a first end of the compensation branch is connected with a reference power supply end, a second end of the compensation branch is connected with the SAR sensor, the compensation branch is used for inducting environmental noise to generate a second noise signal and transmitting the second noise signal to the SAR sensor, the second noise signal is used for simulating the first noise signal, so as to compensate the signal transmitted to the SAR sensor by the detection branch by using the second noise signal. The SAR detection precision of the electronic equipment can be improved.

The invention is for improved regulation of a switching device (2) of an inverter (1) with a filter circuit (3) and a mains relay (4), wherein the filter circuit (3) is composed of at least one filter inductance (LF) arranged in a conductor (P1, P2, P3, P4) and at least one filter capacitance (CF) connecting two conductors (P1, P2, P3, P4) to one another and for the filter circuit (3) an equivalent circuit (15) composed of an effective filter inductance (LF m ) and an effective filter capacitance (CF m ) is used, which effective filter inductance results from at least one filter inductance (LF) of the filter circuit (3) and the topology of the filter circuit (3), and which effective filter capacitance results from at least one filter capacitance (CF) of the filter circuit (3) and the topology of the filter circuit (3), wherein the effective filter inductance (LF m ) and the effective filter capacitance (CF m ) are used as object parameters. In order to determine the object parameters, a voltage pulse is applied between a first conductor output (W1, W2, W3, W4) and a second conductor output (W1, W2, W3, W4) when the mains relay (4) is open; the first conductor output (W1, W2, W3, W4) and the second conductor output (W1, W2, W3, W4) are connected by the switching device (2) to form a closed oscillation circuit (8, 8', 8"), which oscillation circuit extends from the first conductor output (W1, W2, W3, W4) and the first conductor (P1, P2, P3, P4) connected to the first conductor output (W1, W2, W3, W4) via the filter circuit (3) and the second conductor (P1, P2, P3, P4) to the second conductor output (W1, W2, W3, W4) connected to the second conductor (P1, P2, P3, P4); the current and / or voltage change curve (11, 12) in the oscillation circuit (8, 8', 8") is used to determine the current values of the effective filter inductance (LF m ) and the effective filter capacitance (CF m ) as object parameters, with which current values the switching device is regulated.

Disclosed techniques relate to a system for testing a capacitor. An example system includes an inverter to convert DC power from a battery to AC power to drive a motor. The inverter includes a noise filter including a first capacitor connected in series with a second capacitor and a testing circuit configured to test one or more of the first capacitor or the second capacitor. The testing circuit includes a voltage divider including resistors; a voltage detector configured to measure a voltage at the voltage divider; a switch configured to connect the noise filter to the voltage divider; and one or more controllers configured to control an operation of the switch to connect the noise filter to the voltage divider, and to determine, from an output of the voltage detector, whether one or more of the first capacitor or the second capacitor are connected to the noise filter.

The invention relates to the technical field of capacitance detection circuits, in particular to a capacitance digital conversion circuit based on phase-sensitive integration. The circuit comprises a phase shift circuit unit, a capacitance detection unit, a phase control unit and a digital processing unit. According to the invention, an excitation signal is converted into an excitation signal which is 90 degrees ahead by using a phase shift circuit through a phase shift circuit unit, a capacitance detection unit controls a single-pole double-throw switch S1 to alternately access the excitation signal and an inversion signal to a to-be-detected capacitor Cx and a reference capacitor C0, and a phase control unit utilizes integration-deintegration double stages in an integration stage. Phase signals are converted into high and low levels through a comparator so as to control overturning of a capacitor CF pole plate, the digital processing unit carries out phase sampling counting at 0 degree and 180 degrees, the capacitance value is calculated according to the ratio of the number of integration cycles to the number of deintegration half cycles, the influence of stray capacitance is reduced, and the measurement precision is improved.

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.