152 results about "Impedance testing" patented technology

The invention discloses a lithium ion battery thermal runaway early warning method and a multi-frequency real-time impedance test system, and belongs to the field of lithium ion battery safety. The method comprises the following steps: screening a frequency range sensitive to temperature change and insensitive to charge state change through an electrochemical impedance spectroscopy experiment, selecting a characteristic frequency by adopting an RReliefF algorithm, carrying out real-time monitoring on an impedance module value under the characteristic frequency, and judging a safety state and carrying out first-stage, second-stage and third-stage early warning based on a preset strategy; according to the multi-frequency real-time impedance test system provided by the invention, through multi-frequency synchronous excitation, synchronous acquisition and fast Fourier transform analysis, a multi-characteristic frequency impedance measurement period is compressed to be within 0.3 second, and thermal runaway transient impedance change can be captured. The lithium ion battery thermal runaway early warning method can achieve lithium ion battery thermal runaway full-stage grading early warning, is high in early warning accuracy and time resolution, is stable and effective in a 0-100% full SOC range and in batteries of different chemical systems, and provides reliable technical support for lithium ion battery thermal runaway safety protection.

The invention provides a safe charging control method and device of a lithium battery, equipment and a storage medium, and relates to the technical field of lithium batteries. The method comprises the following steps: carrying out impedance test on a lithium battery to obtain a target voltage interference signal indicating that a battery cathode responds and a battery anode does not respond; and then charging the lithium battery, and carrying out capacitance test on the cathode of the lithium battery in real time according to the target voltage interference signal to obtain the cathode capacitance value of the lithium battery in the current charging state. And when it is determined that the negative capacitance value of the lithium battery in the next charging state adjacent to the current charging state meets a preset condition, determining an electric quantity value range according to the electric quantity of the lithium battery corresponding to the current charging state. And in the subsequent charging process of the lithium battery, the electric quantity of the lithium battery is controlled to be within the electric quantity value range. According to the invention, safe charging of the lithium battery can be realized.

The invention relates to the technical field of electrical equipment testing, and discloses a high-precision anti-interference intelligent transformer short-circuit impedance testing machine which comprises an isolation power supply module and a testing host module, an electrostatic shielding layer is arranged in the isolation power supply module, a suspension working power supply isolated from power grid noise is provided for a testing host, and the anti-interference capability is improved from the source. The test host module integrates a power management and inversion module to generate a controllable three-phase AC excitation signal, and the central processing and control module performs closed-loop feedback control on a test current according to a high-precision synchronously acquired signal, so that an external voltage regulator is replaced, and automatic stabilization of a test condition is realized. According to the invention, tedious manual adjustment is not needed, full automation of the testing process is realized, and the precision, repeatability and safety of short-circuit impedance testing are remarkably improved.

The invention relates to the technical field of medical rehabilitation treatment, and discloses a self-adaptive functional electrical stimulation system based on bimodal feedback and a control method. The system comprises a main control module, a stimulation output module, an electroneurographic signal detection module, a biological impedance test module and a safety isolation module. The main control module comprises a safety current determination unit, a stimulation control unit and a dynamic calibration unit which are respectively used for determining an individualized initial safety current based on neural action potential feedback, controlling treatment stimulation output and dynamically calibrating a safety current upper limit according to biological impedance change before and after stimulation. According to the invention, through bimodal feedback of electroneurographic signals and biological impedance, individualized calibration and real-time dynamic optimization of stimulation parameters are realized, and the problem that the treatment effect and safety are difficult to guarantee due to the fact that traditional functional electrical stimulation depends on experience setting and lacks physiological feedback is solved; and the accuracy, safety and adaptability of rehabilitation treatment are remarkably improved.

A display apparatus and a test method therefor. The display apparatus comprises a display substrate (11), and an integrated circuit (12) and a flexible circuit board (13) separately bound and connected to the display substrate (11). The display substrate (11) comprises multiple first substrate pads (111A) and multiple second substrate pads (111B). The integrated circuit comprises a test signal end and multiple first connection pads (121). The display substrate (11) or the integrated circuit (12) comprises a first switch unit (S1) and a second switch unit (S2). At least two first connection pads (121) are electrically connected to the test signal end by means of the first switch unit (S1), and at least two second substrate pads (111B) are electrically connected to the test signal end by means of the second switch unit (S2). The integrated circuit (12) detects the status of the binding connection between the integrated circuit (12) and the display substrate (11), or between the flexible circuit board (13) and the display substrate (11), by means of controlling the connection and disconnection of the first switch unit (S1) and the second switch unit (S2), respectively, such that an impedance test signal of the test signal end passes through test pathways in which the first switch unit (S1) and the second switch unit (S2) are located.

The invention provides a multi-port coupled cable signal abnormity determination method and a related device, and the method comprises the steps: controlling N signal injection modules to input a coupling sweep frequency signal to a to-be-detected cable through the implementation of the embodiment of the invention; receiving M second signals and M standard reflection coefficients from the cable to be detected; determining M third signals based on the M second signals and the M standard reflection coefficients; and determining a fusion signal spectrum under the frequency fk based on the M third signals, wherein the fusion signal spectrum is used for determining a signal abnormal condition of the to-be-detected cable. Therefore, multi-port coupling and synchronous injection are realized at the head end of the cable, and the excitation energy and the signal-to-noise ratio of the broadband impedance test are remarkably improved through superposition and data fusion of multi-path signal energy, so that high-precision positioning and reliable evaluation of the latent defect of the cable are realized under a complex working condition.

This application relates to the field of radio frequency (RF) power supply technology, and discloses a gain calibration method, a dynamic impedance testing method, equipment, and dielectric. The gain calibration method includes: acquiring multiple RF power measurements, where the RF power measurements are the output power measurements of an RF power supply in an open-loop state under multiple load impedance values; performing two-dimensional interpolation fitting in the complex plane of reflection coefficient based on the load impedance values ​​and the RF power measurements to obtain a continuous power distribution; selecting a minimum RF power value in the complex plane of reflection coefficient based on the continuous power distribution to obtain a target minimum RF power value; and calculating the gain of the RF power supply based on the target minimum RF power value, the load impedance value corresponding to the target minimum RF power value, and a preset characteristic impedance value. The embodiments of this application can improve the accuracy of RF power supply gain calibration and reduce the impact of environmental noise and small impedance fluctuations.

This application discloses a method for calculating the vibration isolation of ship vibration isolation devices based on isolator type spectrum data, relating to the field of ship vibration isolation design. The method includes: acquiring the type spectrum data and impedance test data of the target isolator; determining the stiffness and damping parameters of the target isolator based on the type spectrum data and impedance test data; constructing a finite element model of the ship vibration isolation device; inputting the stiffness and damping parameters of the target isolator into the finite element model for calculation, and obtaining the vibration isolation calculation results of the target isolator. This method can efficiently utilize isolator type spectrum data to conduct vibration isolation calculation and evaluation of ship vibration isolation devices during the ship design phase, avoiding resonance between the natural frequency of the vibration isolation device and the excitation frequency of the equipment, and improving the vibration isolation effect.

The application discloses a kind of impedance test file generation methods, comprising the following steps: S1: Genesis software retrieves ERP file and TGZ file from database;The impedance information of PCB board is contained in the ERP file, and the layer information of PCB board is contained in the TGZ file;S2: Genesis software identifies ground point according to TGZ file;S3: Genesis software identifies single-ended impedance line and differential impedance line according to ERP file, and calculates its length;S4: the coordinates of the single-ended impedance line and the end point coordinate of ground point in the preset range are positioned, and the two end point coordinates of differential impedance line in the preset range are positioned;Single-ended impedance line, differential impedance line and corresponding coordinates are formed CSV file output;S5: CSV file is decoded as DIF file and is output.The impedance test file generation method provided by the application can automatically output ground point and impedance line, and can output all data at a time, to ensure that impedance test file can be quickly and effectively generated.

The application relates to the technical field of state monitoring, and discloses a fuse body on-off online detection device based on a time-sharing injection current method, which comprises the following: a main circuit working condition monitoring module which outputs a time-sharing trigger instruction when a main circuit current is in a main circuit zero-crossing judgment interval; a multi-frequency excitation injection module which receives an instruction and injects a multi-frequency composite test alternating current, and multiplexes the multi-frequency composite test alternating current into an electrical impedance test source and an excitation source of acoustic elastic waves; a multi-physical field synchronous acquisition module which acquires a response voltage and an acoustic signal; a characteristic decoupling extraction module which analyzes a multi-frequency band electrical impedance characteristic vector and extracts acoustic emission energy characteristics with the time-sharing trigger instruction boundary as a timing reference; and a fault prediction and health management module which uses a first frequency band low-frequency real part impedance to determine on-off, carries out Markov distance synchronous abnormal diagnosis and characteristic weight adjustment control, and fuses and calculates a health degree index. The application cooperates physical avoidance and algorithm timing, constructs an electrical-acoustic homologous alignment mechanism, and blocks parameter jump caused by pulse interference.

The invention belongs to the field of electric power, and discloses an impedance measurement method, device and equipment for a network-forming inverter and a storage medium, and the method comprises the steps: obtaining an active power reference instruction and a filter capacitor voltage amplitude of an impedance test inverter, and a filter capacitor voltage amplitude of a tested inverter; based on the deviation between the active power reference instruction and the actually measured active power, virtual synchronous machine control is carried out through an active power control module to generate a dynamic power angle difference; inputting the active power reference instruction, the dynamic power angle difference, the filter capacitor voltage amplitude of the impedance test inverter and the filter capacitor voltage amplitude of the tested inverter into a line impedance calculation module; and according to a preset impedance calculation formula, the line impedance calculation module calculates the resistance and inductive reactance of a connection line between the impedance test inverter and the tested inverter.

The invention discloses a high-density myoelectricity acquisition function test system and method, and relates to the field of test tools.The system comprises an analog multiplexer, a signal test module, a short circuit test module and an impedance test module; each channel of the analog multiplexer corresponds to each channel of the signal acquisition module or the impedance acquisition module; the signal test module is used for performing signal test on the signal acquisition module and judging whether the acquisition function of each channel of the signal acquisition module is normal or not; the short-circuit test module is used for realizing short-circuit test between adjacent channels of the signal acquisition module and judging whether the adjacent channels of the signal acquisition module are short-circuited or not; the impedance test module performs function test on the impedance acquisition module and judges whether the acquisition function of each channel of the impedance acquisition module is normal. The function test efficiency of the signal acquisition module and the impedance acquisition module is improved.

The invention discloses a high-power impedance and current-carrying capacity testing device and method, and relates to the technical field of impedance and current-carrying capacity testing. The device comprises an input protection module, a self-coupling adjustable transformer, a mode switching module, a current boosting transformer, an alternating current and direct current switching module, a sampling module, a signal processing and control module, a system display module and a device control panel. According to the invention, input protection-voltage control-mode switching-voltage adjustment-AC / DC conversion-parameter measurement and control are taken as the core work flow of the test device, and through electrical connection of the modules, safe conversion of an external power supply and stable and accurate adjustment and output of test voltage and current are realized. The device has the functions of impedance testing and current-carrying capability testing.

To provide a method, system, and apparatus for transitioning power.SOLUTION: The power transfer device may be configured to fit securely into a fuse block, fuse holder, and / or the like. Power transfer devices may transfer power from a source to a load, such as connected to a fuse block and / or fuse holder, while also isolating power to prevent power from being fed back to the source. Power transfer devices may be used to perform tests, measurements, and / or analyses (e.g., voltage measurements, power measurements, frequency analyses, system impedance tests, etc.).SELECTED DRAWING: Figure 1A

The present application belongs to the technical field of fuel cell, and particularly relates to a kind of fuel cell impedance spectrum fast measurement system and measurement method, system is divided into excitation current injection part, data acquisition part and host computer, host computer uses DIBS signal with excellent peak suppression ability and flexible amplitude frequency design ability as test excitation, uses electronic load as excitation source.Host computer can control electronic load to generate current excitation waveform for impedance test based on DIBS signal, and electronic load injects excitation current into the output current of the measured stack, and host computer can also read the sampling data of data acquisition part, and the collected excitation current and response voltage data are subjected to fast Fourier transform to obtain electrochemical impedance spectrum.The present application improves the impedance measurement efficiency, the hardware structure is simple, has good on-site application prospect, and the measured object can be extended to other electrochemical systems including electrolytic cell, and has good expandability.

The application relates to an online measurement method for motor bearing oil film impedance. The method introduces an excitation voltage into a rotating shaft of a motor, and obtains the voltage U m between the rotating shaft and the ground and the current I m in a test loop through online measurement, calculates the bearing impedance Zb, and further determines the bearing oil film capacitance C b and the resistance R b . The method can realize online testing of the motor bearing oil film impedance for a single bearing structure without special tooling modification of the motor and construction of a special bearing test bed, better monitors the performance state of the bearing during motor operation, judges the health condition of the bearing, and can be applied to online oil film impedance testing of a high-power motor during operation.

The application discloses an IC carrier board testing method and system, mainly relates to the technical field of IC carrier board, to solve the problem of single detection dimension, insufficient positioning accuracy and low test efficiency of the existing scheme. Including: screening out test points with contact resistance value exceeding threshold value or not conducting as detection objects; using TDR time domain reflectometer to perform impedance test under 1GHz frequency band, identifying impedance abnormal area; monitoring the temperature distribution of the IC carrier board, obtaining monitoring temperature points exceeding the preset temperature; determining the monitoring temperature points coinciding with the detection objects or the impedance abnormal area as the abnormal heat conduction points between the multilayer circuits, recording the temperature gradient data of the abnormal heat conduction points; using a preset torque to perform a preset micro stress loading on the IC carrier board; comparing the resistance value change rate of the IC carrier board before and after stress application, and determining the defect type of the carrier board according to the specific preset defect interval where the resistance value change rate falls.

The invention provides a display module and a display device, the display module comprises a display panel and a first circuit board, and pins on the display panel are in binding connection with golden fingers on the first circuit board. And the first pin in the plurality of first-type test pins is electrically connected with the second pin and the third pin. The plurality of golden fingers comprise a first type of test golden fingers, and the non-binding parts of the first type of test golden fingers are provided with first support feet and second support feet. In the impedance test process, a first current is introduced into the first test loop, the current value of the first current is detected by using the two ends of the first test loop, and the voltage values of the two ends of the second test loop are detected. Wherein the structure in the first test loop comprises a first supporting foot corresponding to the first golden finger, a first pin, a second pin and a first supporting foot corresponding to the second golden finger. The structure in the second test loop comprises a second supporting foot corresponding to the first golden finger, a first pin, a third pin and a first supporting foot corresponding to the third golden finger.

The invention discloses a start-stop control method for an impedance test power supply of a new energy grid-connected converter, and belongs to the technical field of power electronic test. According to the method, specific to the safety problems of overvoltage, impact current and the like which are easily generated in the switching process of the impedance test power supply based on the open winding structure of the broadband coupling transformer, the detailed switching-out logic of the starting logic sum is designed. According to the control method, the action time sequence of a low-voltage switch K1, a short-circuit switch K2 and a relay K3 is controlled in a coordinated mode, a follow current resistor R and a zero vector buffering technology are combined, and potential safety hazards such as high voltage and impact current generated in the test power supply starting and switching-out process are avoided; and meanwhile, a quasi-proportional resonance (QPR) control algorithm is adopted, so that the accuracy of broadband impedance measurement is ensured. According to the invention, the core defect of lack of switching safety control in the prior art is made up, high safety and reliability of the test process are realized, and the method is suitable for impedance characteristic test of various new energy grid-connected converters.

This application provides a method, system, and device for identifying abnormal battery cells, relating to the field of abnormal battery cell identification technology. The method includes determining at least one impedance testing frequency based on the relaxation time distribution characteristics of a newly acquired battery cell; performing impedance testing on the battery cell under test according to the at least one impedance testing frequency to obtain an impedance value corresponding to each impedance testing frequency; determining a target impedance of the battery cell under test based on the impedance value corresponding to each impedance testing frequency; and determining whether the battery cell under test is abnormal based on the target impedance of the battery cell under test. This application can identify abnormal battery cells before thermal runaway, improving the accuracy of abnormal battery cell identification.

The invention provides an impedance test file manufacturing method, and belongs to the technical field of impedance testing, and the method comprises the steps: generating a two-dimensional code coordinate file according to the structure distribution information of a circuit board; combining the two-dimensional code coordinate file, the first impedance test files of the plurality of unit plates and the first impedance test file of the at least one test strip, and outputting a third impedance test file of the splice plate; combining the second impedance test files of the plurality of unit plates and the second impedance test file of the at least one test strip, and outputting a fourth impedance test file of the splice plate; and directly applying the third impedance test file of the splice plate and the fourth impedance test file of the splice plate to an impedance test machine for testing. According to the method, the test strip test file is automatically generated and is combined with the two-dimensional code and the unit board test file to form the complete splice board test file, so that the purpose of performing impedance test on the unit board and the splice board in the same equipment is achieved, the flow breakpoint is eliminated, and the test efficiency is improved.

The utility model discloses a plane pressure head test module, and aims to provide a plane pressure head test module which is simple in structure, increases the contact area between a pressure head and conductive silica gel, reduces the impedance between the pressure head and the conductive silica gel, can be integrally fixed, and enables the test precision to be higher. The electric connector comprises a pressing seat and an electric conduction pressing block, an installation boss is arranged at the upper end of the pressing seat, an installation groove is formed in the upper end face of the installation boss, the electric conduction pressing block is matched with the installation groove in a limiting mode, the connecting end of the electric conduction pressing block is connected and conducted with the pressing seat through the installation groove, and a connector is arranged at the lower end of the pressing seat. The pressing base is connected with the movable end of an external pressing machine table through the connector. The device is applied to the technical field of product impedance testing.

The invention relates to the technical field of microelectronics, and discloses an impedance calibration device and method, the impedance calibration device comprises a circuit board, an impedance line and a characteristic impedance, and the copper surface of the circuit board is provided with a first contact; the impedance line is arranged on the circuit board, and a second contact and a third contact are arranged on the impedance line; and one characteristic impedance is arranged at each of the two ends of the impedance line. One signal pin of the probe is inserted into the second contact, and the other signal pin of the probe is inserted into the third contact, so that differential impedance calibration is realized; one signal pin of the probe is inserted into the first contact, and the other signal pin of the probe is inserted into the second contact or the third contact, so that single-end impedance calibration is realized; one device realizes two operations of differential impedance calibration and single-ended impedance calibration, and can perform impedance test on an impedance line in a board. According to the impedance calibration device provided by the invention, the problem that impedance test calibration cannot be carried out on in-board lines in a board edge impedance line test mode in the prior art is solved.

The invention discloses a converter frequency coupling impedance test and calculation method and system. The method comprises the following steps: selecting a disturbance source form according to the type of a to-be-tested converter, and constructing an impedance test circuit of a steady-state working point; a steady-state working point of the converter is simulated by adjusting parameters of a controlled source for the impedance test circuit, and a positive-sequence harmonic disturbance signal and a negative-sequence harmonic disturbance signal are injected in a superposed manner, so that a response signal is obtained; performing spectral analysis on the positive-sequence harmonic disturbance signal, the negative-sequence harmonic disturbance signal and the response signal, and calculating phasors and phase differences of power frequency and harmonic components; based on the phase difference, performing phase correction on a coupling component in the response signal to obtain a correction result; and calculating equivalent harmonic impedance by using a correction result, and outputting a frequency coupling matrix of the harmonic impedance of the converter in the full frequency band. By implementing the method provided by the invention, the impedance measurement requirements of various converters are met, so that the limitations of unclear initial phase, lack of physical concept of coupling impedance, difficulty in four-quadrant impedance measurement and calculation and the like in the traditional technology are overcome.

The invention relates to the technical field of generators, in particular to a generator rotor alternating current impedance testing device and method.The device comprises a box body and an intelligent panel, and the intelligent panel comprises a power supply used for supplying power to the generator rotor alternating current impedance testing device; the power supply output end is used for providing working voltage; the switch assembly is used for controlling the working state of the device. The display assembly is used for displaying AC impedance test data; the voltage regulating assembly is used for regulating the current output voltage; the box body comprises a current acquisition assembly used for acquiring a current signal; the voltage acquisition assembly is used for acquiring a voltage signal; the isolation voltage regulation assembly is used for providing an adjustable alternating current power supply; and the processing assembly is used for calculating AC impedance test data according to the collected current signal and voltage signal. Therefore, the problems that equipment is heavy, wiring is tedious, operation is not safe and multi-person cooperation is needed in a traditional generator rotor alternating current impedance testing method are solved, and intelligent, portable and integrated generator rotor alternating current impedance testing is achieved.

The utility model discloses a kind of electrochemical impedance testing devices for soft package battery, it is related to lithium ion battery testing technical field, including base, clamping plate, pressure display, test fixture, fixture outer lead and initiative pole, the four corners of the base are slidably connected with guide pillar respectively, the top of multiple guide pillars is equipped with the clamping plate parallel to base, the clamping plate is equipped with pressure display, the base is provided with multiple test fixtures, multiple test fixture tail end is equipped with fixture outer lead, the initiative pole lower end is in the center of the base, the initiative pole upper end is rotatably connected on clamping plate, the utility model can reduce the contact resistance between fixture and battery when testing impedance and the internal resistance of fixture itself;By moving the clamping groove, the pole lug of different spacing can be connected, to avoid the battery pole lug excessive distortion;Reduce test error, improve the repeatability and consistency of test result.

The application relates to the technical field of antenna testing, and discloses an antenna radio frequency and impedance testing system. The system comprises an antenna testing template library, a flowchart integration unit and a testing requirement mapping unit. The antenna testing template library stores various antenna type templates, each of which is associated with a radio frequency testing flowchart comprising a radio frequency parameter processing node; the flowchart integration unit combines the radio frequency testing flowcharts of the same type of antenna into an integrated radio frequency testing flowchart; and the testing requirement mapping unit obtains radio frequency and impedance testing requirements, selects a corresponding integrated radio frequency testing flowchart based on the radio frequency performance requirements, and extracts a basic radio frequency testing flowchart from the integrated radio frequency testing flowchart based on the impedance testing requirements. The system realizes standardized management and flexible calling of the antenna testing process, promotes the collaborative linkage of radio frequency and impedance testing, adapts to different testing requirements and antenna types, and improves the testing efficiency and completeness.

The invention discloses a rapid electrochemical impedance testing method applied to low-temperature starting of a fuel cell, and belongs to the technical field of fuel cell detection. The method aims at solving the problems that traditional electrochemical impedance spectroscopy testing time is too long, and rapid real-time monitoring cannot be achieved in the low-temperature starting process, and comprises the steps that firstly, water logging and cathode blocking faults are simulated at the normal temperature, and a multi-working-condition impedance database is constructed; 3-4 characteristic frequency bands most sensitive to the fault state are screened out from the full-band data in combination with equivalent circuit modeling and a machine learning algorithm; finally, in the low-temperature starting process of the fuel cell, the disturbance signals of the characteristic frequency bands are only applied to the cell for rapid scanning. According to the method, the single test time is shortened to 10-15 seconds from the traditional 2-5 minutes, real-time and accurate diagnosis of key states such as membrane electrode icing and liquid water blockage is realized, and an effective tool is provided for optimizing a low-temperature starting control strategy of the fuel cell.

A smart circuit breaker tester is provided as a portable system for testing medium-voltage circuit breakers. The system includes a programmable logic controller (PLC), a human-machine interface (HMI), transducers for measuring current and voltage, an impedance tester, a smart power supply for supplying voltages required for testing circuit breakers with related power and safety components, and plug and play and OEM cables for connecting the system to the circuit breaker under test. The PLC is programmed with custom software that reports such testing criteria as closing time and closing drain current, opening time and opening drain current, contact resistance, etc. within about two minutes, and permits testing automatically in sequence or manually one at a time. The system permits testing in situ while the circuit breaker is still connected to the circuit(s) being protected, or when drawn out.

This invention relates to the field of in-situ impedance testing technology for energy storage batteries. To address the current difficulties in achieving rapid tracking of wideband excitation signals and the inaccurate identification and measurement of electrochemical parameters, it provides a battery in-situ impedance testing method and system based on adaptive phase compensation. The method includes acquiring the initial reference current and actual sampled current of the battery charging and testing system; iteratively calculating the real-time phase lag angle and generating a corrected reference current command accordingly; predicting the current response in two steps based on a discrete mathematical model of the full-bridge converter in continuous conduction mode; and optimizing the switching state corresponding to the voltage vector that minimizes the composite cost function to drive the switching transistors of the full-bridge converter. This method balances fast dynamic response with zero phase error tracking, meeting the high-precision requirements of in-situ EIS testing of energy storage batteries.