15 results about "Capacitance meter" patented technology

The invention, which belongs to the technical field of the energy storage converter, discloses an electrical parameter sensing-based service life monitoring system for a capacitor of a network-forming type energy storage converter, comprising the following steps of: synchronously acquiring a direct-current voltage signal and a three-phase alternating-current signal of a direct-current bus capacitor through an electrical parameter acquisition module to form a multi-dimensional feature vector; a state observer built in the ESR estimation module is used for analyzing the signal, a target capacitor ESR value is obtained, and a capacitor core temperature value is obtained through back-stepping through an electric-thermal coupling field analysis model of a core temperature back-stepping module in combination with preset capacitor surface temperature data; based on the ESR value and the capacitor core temperature value, a life prediction module calculates the residual life and health degree index of the capacitor; and the power scheduling module executes capacitor health degree-power output joint scheduling according to the health degree index, adjusts the power fluctuation range of the converter, and feeds back real-time working condition data to the electrical parameter acquisition module, thereby realizing accurate monitoring of the capacitor state and intelligent scheduling of the converter power.

A hair analyzer includes a first electrode, configured to contact a first portion of a hair; a second electrode, configured to contact a second portion of the hair; a capacitance meter, configured to measure a capacitance between the first electrode and the second electrode; and a processor, configured to generate a hair assessment based on the capacitance.

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.

This invention provides a method and apparatus for determining the collector-emitter voltage during the IGBT turn-off delay process. The method includes: determining the gate current expression based on a pre-established IGBT parasitic capacitance model using the gate-emitter capacitance current, gate-collector capacitance current, and gate-collector capacitance voltage; determining the gate-collector capacitance expression using the gate-collector capacitance voltage; obtaining the relationship between the collector-emitter voltage and the gate voltage and gate-collector capacitance voltage based on the gate current expression and the gate-collector capacitance expression; and solving the relationship to determine the expression for the change of the collector-emitter voltage over time. This invention, by determining the expression for the change of the collector-emitter voltage over time, enables the estimation of the collector-emitter voltage by observing the gate voltage and gate current of the IGBT device, achieving accurate and efficient monitoring of the collector-emitter voltage during the IGBT turn-off delay process, and providing a basis for IGBT turn-off process monitoring and analysis.

The invention relates to a fluoroplastic foaming extrusion production system and a use method thereof, and belongs to the technical field of wire and cable manufacturing equipment. Comprising a movable disc pay-off machine, a front traction machine, a front-section double-shaft diameter measuring instrument, an oven preheater, a vacuum filling machine, an integrated foaming extrusion unit, a vacuumizing device, a rear-section double-shaft diameter measuring instrument, a movable warm water tank, a fixed warm water tank, an in-water capacitance meter, a first spraying water tank, a water blower, a four-shaft eccentric meter, a rear traction machine and a spark machine which are sequentially arranged in the direction of a production line. The system comprises an integrated foaming extrusion unit, a three-axis concave-convex instrument, a data display processing device, an analysis and prediction module, a control module, a second spraying water tank and a movable disc take-up machine, and the integrated foaming extrusion unit comprises a main machine extruder, a first inclined auxiliary machine extruder, a second inclined auxiliary machine extruder and a foaming machine head. According to the invention, high-precision stable production in the whole process can be realized, an extremely stable material flow foundation is provided for a production line, and the consistency of the size and the performance of a product is fundamentally guaranteed.

The capacitor marking device comprises a rack and further comprises a conveying line arranged on the rack in the X-axis direction, a dust removal mechanism and a turnover mechanism which are arranged on the rack and located at the two ends of the conveying line respectively, and a marking mechanism arranged on the rack and located between the dust removal mechanism and the turnover mechanism. The dust removal mechanism is used for removing dust on the surfaces of the capacitors, the marking mechanism is used for marking the upper surfaces of the capacitors, and the overturning mechanism is used for overturning the marked capacitors. The device has the advantages that the dust removal mechanism, the marking mechanism and the turnover mechanism are sequentially arranged along the conveying line, full-process automatic operation of surface dust removal, upper surface marking and automatic turnover of the capacitor is achieved, the influence of dust on the marking quality is effectively avoided, manual intervention is reduced, and the production efficiency and the product yield are remarkably improved. And meanwhile, the capacitor can be overturned by the overturning mechanism, so that double-sided processing of the capacitor is facilitated.

The invention relates to a MEMS element (1) for the mechanical-electrical conversion of frequent changes, such as pressure changes, sound waves, structure-borne sound waves, and / or ultrasound waves, into electrical signals, comprising: at least two oppositely differentially measuring capacitors, each consisting of at least one fixed electrode (17, 18, 19, 20) and at least one movable electrode (8, 9, 10, 11, 13, 14, 15, 16), wherein the movable electrode (8, 9, 10, 11, 13, 14, 15, 16) is coupled to a membrane arrangement (5) consisting of at least two membranes (3, 4) with a defined distance between each other, wherein the conversion into electrical signals is carried out by a differential measurement of at least two capacitance changes resulting from a mechanical change of an area overlap size (21-28) between the fixed electrode (17, 18, 19, 20) and the movable electrode (8, 9, 10, 11, 13, 14, 15, 16), which is defined by a lateral capacitive area between the fixed electrode (17, 18, 19, 20) and the movable electrode (8, 9, 10, 11, 13, 14, 15, 16).

A Successive Approximation Analog-to-Digital Converter (SAR_ADC) and method of operating the same are provided. Generally, the SAR_ADC includes a comparator having a first input to receive an input voltage (VIN), and a second input coupled to a n-bit capacitive digital-to-analog converter (DAC) to receive a voltage (VDAC), a Successive Approximation Register (SAR) coupled to a comparator output to provide n digital control signals to the DAC, and to store and output an n-bit binary-number approximating VIN, and a reference buffer to provide a voltage (VREF) to the DAC. The DAC sequentially drives each capacitance beginning with a most significant bit towards VREF, while the comparator compares the resulting VDAC to VIN, and the SAR sets or clears a current bit represented by the capacitance driven. The reference buffer includes adaptive power tuning to dynamically tune a drive-strength of the reference buffer based on the current bit.

The utility model provides an energy harvesting type capacitor, which relates to the technical field of energy storage capacitors, and comprises a capacitor main body, a clamped piece is arranged at the top of the capacitor main body, a parallel transverse clamping groove is arranged on one side of the clamped piece, and the edge of the inner wall of the parallel transverse clamping groove is a fillet. The capacitor is generally large in size and dead weight, most of the capacitor is cylindrical, the surface of the capacitor is smooth and lacks stress points, the capacitor is prone to falling off in the clamping process, the installation difficulty is increased, the working efficiency is reduced, and in order to ensure the clamping stability, the clamping force of a clamping assembly needs to be greatly increased, so that the clamping efficiency is greatly improved. However, the increased clamping force can cause scratching of the surface of the capacitor, so that scratches are generated, even the outer layer of the capacitor is damaged, and internal substances flow out, which not only can influence the performance and the service life of the capacitor, but also can cause damage to the whole circuit system.

The present disclosure discloses a power supply system and an electronic device. The power supply system is used to supply power to a load, and includes a system board, a substrate, an output capacitor, a positive output lead area, a negative output lead area, and a power unit. The system board includes oppositely arranged first and second surfaces, and the load is arranged on the first surface. The substrate includes oppositely arranged first and second surfaces, and the first surface of the substrate is located between the second surface of the system board and the second surface of the substrate. The output capacitor is attached to the second surface of the system board. The positive output lead area and the negative output lead area are arranged on the first surface of the substrate, connected to the second surface of the system board, and electrically connected to the output capacitor through wiring in the system board. The power unit is arranged on the second surface of the substrate and electrically connected to the positive output lead area and the negative output lead area through wiring in the substrate.

The application discloses an optimization method and system for improving the scanning angle of an electrostatic MEMS (Micro Electro Mechanical System) mirror, which comprises the following steps: establishing a dynamic equation of the electrostatic MEMS mirror, obtaining a driving torque, and establishing a driving torque expression; establishing a finite element model of a driver with different comb-to-shaft distances, simulating the finite element model, obtaining the relationship between the capacitance of different drivers and the angle, fitting the obtained relationship between the capacitance of different drivers and the angle, and obtaining a driver capacitance expression; obtaining an expression of a resonance amplitude based on the obtained driver capacitance expression, the driving torque expression and the dynamic equation of the electrostatic MEMS mirror, and obtaining the resonance amplitude of the electrostatic MEMS mirror under different comb-to-shaft distances based on the expression of the resonance amplitude; and selecting the comb-to-shaft distance corresponding to the maximum value in all resonance amplitudes to optimize the driver of the MEMS mirror. The MEMS mirror can reach the maximum scanning angle, thereby meeting the demand of the electrostatic MEMS mirror in a large field of view application scenario.

The application provides an IGBT internal parameter determination method and device based on a gate signal, and the method comprises the following steps: obtaining a gate current expression and a Miller capacitance expression according to a pre-established IGBT parasitic parameter model and a capacitor voltage; substituting the gate current expression and the Miller capacitance expression into the IGBT parasitic parameter model to obtain a parasitic parameter expression; selecting three time points in an IGBT off-delay process at random, and obtaining a gate parasitic inductance expression, a gate resistance expression and a gate-emitter capacitance expression by using a preset gate voltage waveform, a gate current waveform and the parasitic parameter expression. By determining the expression corresponding to the IGBT internal parameter, the Miller capacitance, the gate parasitic inductance, the gate resistance and the gate-emitter capacitance are estimated by observing the gate voltage and the gate current of the IGBT device, so that the IGBT internal parameter can be monitored efficiently and accurately.

The invention belongs to the technical field of capacitor control, and particularly relates to an adjustable capacitor calibration method and calibration device. The calibration method comprises the following steps: dividing the total stroke of the capacitor into a plurality of interval point positions, electrifying and controlling the capacitor to rotate to the 0th point; measuring the capacitance value of the current point location; comparing the input capacitance value with a target capacitance table to calculate a deviation value; judging whether the deviation value is smaller than a target error value; debugging and calculating to obtain a capacitance output value by combining the deviation value with a target capacitance value; and judging whether the current click number is the maximum click number of the divided interval or not, and storing all capacitance output values to an output sequence. The problem that the precision cannot be maintained due to the fact that errors such as capacitor mechanical wear cannot be effectively compensated is solved. By detecting a deviation value, a more accurate compensation complex nonlinear error is formed by fitting in a segmented curve manner, so that the non-ideal characteristics of hardware are complemented and output by using a software algorithm, and the output precision is ensured.

The invention discloses an electrochemical interface wettability in-situ measuring device and method based on an inverted bubble method.The electrochemical interface wettability in-situ measuring device comprises a transparent electrochemical testing pool, a working electrode and a counter electrode are arranged in the transparent electrochemical testing pool and are oppositely arranged, and a separation material layer is arranged between the working electrode and the counter electrode; a reference electrode and a sample injection needle are also arranged in the transparent electrochemical test cell, the working electrode, the counter electrode and the reference electrode are respectively connected with an electrochemical workstation, the transparent electrochemical test cell is arranged on a contact angle measuring instrument, and bubbles are introduced into the lower end of the working electrode. The method has the advantages that the wettability of the charged interface of the hydrophilic electrode material is accurately measured, important parameters such as a zero charge point, interface electric double-layer capacitance and surface energy change can be obtained, and technical support is provided for optimization of an electrocatalytic material and research of an electrochemical process.

The application discloses a network type energy storage converter capacitor life monitoring system based on electric parameter sensing, and belongs to the technical field of energy storage converters. The system comprises the following steps: collecting the DC voltage signal and three-phase AC current signal of a DC bus capacitor synchronously through an electric parameter acquisition module to form a multi-dimensional feature vector; obtaining the ESR value of a target capacitor by analyzing the signal with a state observer built in an ESR estimation module, and obtaining the capacitor core temperature value by backstepping the electric-thermal coupling field analysis model of a core temperature backstepping module in combination with preset capacitor surface temperature data; calculating the capacitor remaining life and health index based on the ESR value and the capacitor core temperature value; and executing capacitor health-power output joint scheduling according to the health index by a power scheduling module, adjusting the converter power fluctuation range, and feeding back real-time working condition data to the electric parameter acquisition module, so that accurate capacitor state monitoring and intelligent converter power scheduling are realized.