38 results about "Impedance variation" patented technology

This invention discloses a radio frequency (RF) power control system and method, and an RF plasma system. The method includes: before the electrostatic chuck cleaning begins, loading a preset parameter set of an impedance matching network associated with the selected cleaning process recipe, and driving the variable capacitors and variable inductors in the impedance matching network to their preset initial positions in the preset parameter set before applying continuous wave RF power; applying continuous wave RF power to the electrostatic chuck and initiating the cleaning process; during the cleaning process, acquiring the load impedance in the impedance matching network in real time at a preset sampling rate, generating a real-time impedance trajectory, and calculating the impedance change rate; determining the current cleaning stage of the electrostatic chuck based on the magnitude of the load impedance and the impedance change rate, and dynamically switching to the impedance matching algorithm corresponding to the cleaning stage to adjust the positions of the variable capacitors and variable inductors in the impedance matching network. This invention achieves low-reflection power matching throughout the entire cleaning process.

The application provides a metal film thickness measurement method and device for tungsten gate chemical mechanical polishing, comprising a sensor probe, a power module, a signal excitation module, a differential amplification module, a synchronous demodulation module, a data acquisition and processing module; the sensor probe comprises coaxially arranged excitation coils, detection coils and balance coils; the signal excitation module drives the three-coil resonance module to induce eddy current effect at the metal film to be measured; the differential amplification module converts the equivalent impedance change caused by the eddy current effect in the coils into a differential signal, and simultaneously improves the dynamic range through low-noise amplification; subsequently, the synchronous demodulation module multiplies the differential signal with a reference signal, and extracts a direct current component proportional to the signal amplitude through a low-pass filter; the obtained voltage amplitude signal is input into the data acquisition and processing module; the application can significantly amplify the weak signal related to the film thickness, effectively suppress common-mode noise, obtain nanometer-level thickness resolution, and has a high signal-to-noise ratio.

The application discloses a kind of pulse response type dynamic impedance measurement and regulation device, comprising: pulse generation unit, control unit, acquisition module;Control unit sends the control signal including operating parameter to pulse generation unit;Pulse generation unit generates low-voltage pulse, and low-voltage pulse is applied in load both ends;Module synchronous measurement voltage and current in load both ends, and voltage and current are detected, while analog signal is converted into digital signal;Control unit stores and transports the digital signal collected, and obtains impedance value according to voltage and current.This application is measured by applying real-time voltage pulse to ablation tissue, and the real-time impedance change of ablation tissue is calculated according to the voltage and current in the two ends of ablation tissue, so as to realize the real-time evaluation of the ablation effect of target area.The device can be used with high-voltage pulse ablation equipment through interface unit, realize the feedback adjustment of high-voltage pulse parameters, and more optimized ablation effect can be obtained in shorter time.

This invention discloses a welding torch nozzle device with self-powered and self-diagnostic functions, including a nozzle body, a thermoelectric conversion unit, an impedance sensing unit, and a signal processing unit. The signal processing unit is electrically connected to both the impedance sensing unit and the thermoelectric conversion unit, and the thermoelectric conversion unit supplies power to the signal processing unit. The signal processing unit receives impedance change signals from the impedance sensing unit and determines whether the nozzle is clogged. By placing the thermoelectric conversion unit on the outer wall of the nozzle body to recover welding waste heat and convert it into electrical energy, and placing the impedance sensing unit on the inner wall of the nozzle body to directly detect impedance changes caused by spatter adhesion, combined with the signal processing unit, in-situ real-time monitoring under self-powered conditions is achieved, forming a nozzle structure that integrates power supply and sensing. This eliminates the dependence on external power sources and complex wiring, improves the reliability and adaptability of the system in harsh welding environments, and significantly enhances the stability of the welding process and the quality of the weld.

A thermally adaptive antenna system having an antenna structure, an EM) power signal, a DC power signal, an impedance tuner, a temperature sensor in the antenna, a DC-DC conversion component, and a microcontroller. The microcontroller provides a tuning command to the impedance tuner, causing the impedance tuner to compensate for an impedance change in the antenna due to a temperature change in the antenna. An environmentally adaptive antenna system has an antenna structure, an EM power signal, a DC power signal, an EM power splitter, a directional coupler, a reference receiver, a measurement receiver, an impedance tuner, and a controller. The controller calculates antenna impedance change based on observed changes in return loss, calculates a corresponding correction to the antenna impedance, and sends a command to the impedance tuner to implement the correction to the antenna impedance.

The application provides an intelligent ultrasonic surgical device based on piezoelectric impedance-vibration multi-modal fusion and a control method. The device comprises a host computer and a handheld part. The ultrasonic transducer in the handheld part comprises a piezoelectric ceramic stack. The piezoelectric ceramic stack outputs a raw electrical signal modulated by a load as a sensing feedback while generating ultrasonic mechanical vibrations. A signal acquisition and processing module in the host computer synchronously acquires voltage and current components in the raw electrical signal, pre-processes and decouples impedance change information and vibration characteristic information. Subsequently, the above multi-modal information is fused and analyzed based on a preset algorithm model to generate a feedback signal representing the current state of the target tissue for closed-loop control. The application can accurately identify the dynamic state characteristics of the tissue during the operation process online, and improve the adaptive adjustment capability of the energy output of the ultrasonic surgical device and the safety of the operation.

The utility model discloses a kind of non-contact temperature detection device and motor. Non-contact temperature detection device includes: sensing unit and detection unit;Wherein, sensing unit includes first circuit and second circuit;First circuit is arranged in the inside or surface of the object to be measured, and the equivalent impedance of first circuit changes with the temperature variation of the object to be measured;Second circuit is coupled with first circuit, and the equivalent impedance of second circuit changes with the equivalent impedance variation of first circuit;Detection unit is electrically connected with second circuit, for detecting peak voltage, and the equivalent impedance of second circuit is calculated according to peak voltage, to determine the temperature of the object to be measured according to the equivalent impedance of second circuit. The scheme provided by the utility model can realize non-contact temperature measurement of the object to be measured without environmental constraints, and the device is simple in structure, and production cost is saved.

The application discloses a flexible circuit board bending compensation signal impedance matching circuit, which comprises a flexible circuit board main body, a signal transmission line, an impedance compensation unit and a connecting terminal. The signal transmission line is arranged on the flexible circuit board main body, and the two ends of the signal transmission line are connected with the first connecting terminal and the second connecting terminal respectively; and the bending area is provided with the impedance compensation unit comprising a plurality of distributed compensation elements. In the preferred scheme, the compensation elements adopt a capacitor compensation structure composed of an electrode pair with an area of 0.01-0.1 mm2 and a dielectric layer with a thickness of 5-20 mu m, and a negative temperature coefficient thermistor with a resistance of 100 omega-1 k omega is additionally arranged to realize temperature compensation. The application dynamically adjusts the parasitic parameters of the bending area through the distributed impedance compensation unit, so that the signal transmission line (50-150 mu m line width) keeps the impedance stable in the bending state, and the signal integrity problem caused by the deformation of the existing flexible circuit board is solved. The circuit is particularly suitable for high-frequency signal transmission scenes, the impedance change rate is less than 3% when the bending radius is 5 mm, and the working frequency range covers DC-20 GHz.

At least part of an electrically insulating coating that covers at least one insert is removed from the object by way of the tool. A first electrode is placed opposite the object so as to form, with the insert, a first capacitor, a first plate of which is formed by the first electrode and a second plate of which is formed by the insert. A second electrode is associated with the tool such that, when the tool comes into contact with the insert, an electrical connection is established between the second electrode and the insert that forms the second plate of the first capacitor. A variation in impedance caused by the electrical connection of the first capacitor to the second electrode is detected.

To realize a power receiving device that can determine its own resonant frequency without a power transmission device. [Solution] The power receiving device (3) includes a resonant circuit (31), an application unit (52) that applies a search voltage to the resonant circuit from inside the power receiving device and changes the frequency of the search voltage, a measurement unit (53) that measures the change in impedance of the resonant circuit in accordance with the change in frequency of the search voltage without power transmission from the power transmitting device, and a determination unit (54) that determines the resonant frequency of the resonant circuit based on the change in impedance.

The application discloses a kind of water conservancy pump station low-voltage reactive power compensation system online configuration and dynamic regulation method, it is related to electrical automation control technical field, to solve the technical problem that traditional method cannot actively respond to water hammer impact and leads to system impedance mutation and resonance risk, and lack of water pump and compensation device collaborative control ability, comprising the following steps: S1: online construction and update pump station hydraulic-electric coupling dynamic model;S2: based on hydraulic-electric coupling dynamic model, for the water pump start-stop of water hammer and electrical disturbance induced in pump station operation and valve regulation operation, predict the system equivalent impedance change path that it will cause, and combine preset impedance safety boundary, plan a safe impedance track.The application constructs model, and based on this model, a smooth and avoid resonance risk area safe impedance track is planned for pump station key operation in advance, realizes the fundamental change from passive response to active defense.

The objective is to provide a technology that can suppress changes in impedance caused by changes in the distance between two spring contact points. [Solution] The connector device comprises a first connector connected to a first substrate and a second connector connected to a second substrate. The first extended portion of the first terminal of the first connector and the second extended portion of the second terminal of the second connector are separated from each other along a second direction perpendicular to the first direction when the mating dimension is set to a first dimension. The first connector housing has a housing pressing portion that presses the second connector housing when the mating dimension between the first connector and the second connector is greater than the first mating dimension. The second connector housing has a pressed portion that is pressed by the housing pressing portion and a terminal pressing portion that presses the second signal terminal when the pressed portion is pressed by the housing pressing portion, bringing the second extended portion closer to the first extended portion.

This application discloses a transmission line impedance calibration method, system, and storage medium. The method includes: acquiring the impedance change slope of a sample transmission line of the same type as the transmission line under test, and calibrating the original time-domain reflection impedance curve of the transmission line under test based on this impedance change slope to obtain a target time-domain reflection impedance curve. By acquiring the impedance change slope of a sample transmission line of the same type and performing compensating calibration on the transmission line under test, this application effectively solves the problem of a false increase in impedance value with increasing test distance in long-distance transmission line TDR testing. The calibrated impedance data is closer to the true characteristics of the transmission line harness, providing a reliable data basis for harness quality assessment.

The present invention achieves a power reception device capable of identifying its own resonance frequency without a power transmission device.　This power reception device (3) comprises: a resonance circuit (31); an application unit (52) that applies a search voltage to the resonance circuit from inside the power reception device and changes the frequency of the search voltage; a measurement unit (53) that measures a change in the impedance of the resonance circuit due to the change in the frequency of the search voltage, without power transmission from a power transmission device; and a determination unit (54) that determines the resonance frequency of the resonance circuit on the basis of the change in the impedance.

The application discloses an embedded intelligent voltage regulating system with dynamic impedance matching and harmonic collaborative suppression, and relates to the technical field of voltage regulating of power distribution networks. The embedded intelligent voltage regulating system comprises an inversion marking module, an impedance and harmonic identification module, a traction matching module, an excitation execution module and a state verification module. The inversion marking module obtains inversion output operation data of a flexible voltage regulator, marks an inversion state position, and outputs inversion end marking data. The impedance and harmonic identification module identifies load impedance variation and characteristic harmonic distribution, and generates impedance harmonic data. The traction matching module performs traction correlation analysis on the load impedance variation and the characteristic harmonic distribution in the impedance harmonic data, and forms traction control data. The excitation execution module accesses control relationship arrangement and excitation regulation relationship arrangement, and generates impedance execution data. The state verification module verifies the inversion output state of the flexible voltage regulator according to the impedance execution data, collects results, and outputs voltage regulating result data. The embedded intelligent voltage regulating system realizes collaborative execution of dynamic impedance matching and characteristic harmonic traction by accessing control relationship arrangement and excitation regulation relationship arrangement.

The application relates to the technical field of connectors, in particular to a connector plugging impedance change detection and early warning method and system based on a sensor. The method comprises the following steps: acquiring a resistance measurement signal and a pressure measurement signal, calculating a time sequence impedance value sequence, and dividing the time sequence impedance value sequence into a stable period and a fluctuation period; screening out a first effective impedance value, and constructing an evaluation interval; continuously judging impedance changes in the evaluation interval, and dynamically adjusting the evaluation interval according to the judgment result to identify transient and occasional signal jumps; and filtering impedance values in the interval, and removing impedance values exceeding a preset allowable error range from the evaluation interval. The application distinguishes signal jumps from impedance abnormalities with higher potential risks, avoids false alarms caused by instantaneous interference, reduces the false alarm rate of early warning, and improves the accuracy of plugging abnormality diagnosis.

The application relates to the technical field of power equipment safety monitoring, in particular to a short-circuit fault detection method and system of a track socket, aiming to solve the problem that in the prior art, a traditional scheme depends on an over-current protector to realize overall tripping, cannot distinguish specific fault modules or track contact positions, and thus needs to be disassembled and checked one by one during maintenance. The application injects a high-frequency signal into a metal track of the track socket through a high-frequency signal generating unit and monitors impedance changes in real time, triggers a hierarchical early warning when the impedance is abnormal, and realizes accurate positioning of a fault module in combination with segmented level coding, thereby solving the technical defects that the traditional scheme cannot identify short-circuit precursors and the positioning is ambiguous, and having the remarkable advantages of improving maintenance efficiency and safety protection level.

This invention discloses a high-sensitivity wireless temperature sensor based on impedance superposition, belonging to the field of sensor design technology. The sensor includes a piezoelectric substrate, and a temperature-sensitive busbar, connecting wires, interdigitated electrodes, and an acoustic structure disposed on the surface of the piezoelectric substrate. The temperature-sensitive busbar is a composite temperature-sensitive structure composed of a temperature-sensitive dielectric layer and four metal films. The connecting wires are disposed in the outermost region of the acoustic structure, and a series structure of a thermistor and a varistor is set near the endpoint of the acoustic structure to stabilize the impedance of the connecting wires. The acoustic structure integrates a sound-absorbing structure to maximize sound wave reflection efficiency. The temperature-sensitive busbar forms a parallel impedance superposition with the acoustic structure through the connecting wires, superimposing the impedance change of the temperature-sensitive busbars onto the sensor's own response. This invention significantly improves temperature sensitivity without changing the piezoelectric substrate or increasing the sensor area, while maintaining the stability of the connecting wire impedance, and is suitable for resonant and delay-line wireless temperature sensors.

This invention belongs to the field of rotor fault classification and assessment technology, specifically involving a rotor guide bar fault detection system and method based on an asymmetric dual-frequency eddy current array. The inner layer excitation coil of the probe corresponds to the distribution of the guide bars, while the outer layer receiving coil has a higher density and covers the guide bars and gap areas, adapting to the rotor's curved surface. A dual-frequency excitation module applies low-frequency and high-frequency signals in a time-division manner, forming a gradient eddy current field inside the rotor. An angle synchronization drive module achieves precise synchronization between the response signal and the rotor position. A signal conditioning and acquisition module performs lift-off compensation and phase correction. A feature identification and processing module extracts the dual-frequency amplitude ratio, phase difference, and impedance change values, and identifies the fault type, location, and severity based on a multi-dimensional feature threshold matrix. This invention uses an asymmetric array structure to eliminate blind spots in guide bar gap detection and distinguishes between surface and internal defects through a dual-frequency collaborative mechanism. It can adapt to rotor rotation conditions, and the detection results are less affected by mechanical vibration and lift-off fluctuations.

This invention discloses an online diagnostic method and system for secondary circuit virtual connection faults in relay protection devices, relating to the field of power grid relay protection technology. The method includes: setting a multi-frequency safety perturbation signal and applying it to the perturbation-diagnostic branch; simultaneously collecting perturbation response observation data at different perturbation frequency bands; extracting equivalent impedance change characteristics, response time change characteristics, attenuation process change characteristics, and inter-band discrete characteristics from the perturbation response observation data to generate a virtual connection impedance fingerprint of the secondary circuit, and performing differential comparison with a healthy impedance benchmark profile to generate a virtual connection sensitive residual spectrum; backfilling the virtual connection sensitive residual spectrum into the secondary circuit topology diagnostic map to obtain a virtual connection residual topology map, and performing residual propagation positioning along the secondary circuit functional transmission direction to determine the virtual connection fault location point. This invention achieves the proactive stimulation of the secondary circuit virtual connection impedance response under controlled operational risks, improving the online identification capability of early virtual connection states.

This invention discloses a winding reuse-based self-sensing system and method for motor rotation angle based on the eddy current effect, belonging to the field of micro-motor sensing and control technology. It includes a brushless coreless motor rotor, a non-magnetic conductive strip disposed on the rotor surface, a multi-pole coil winding, and a high-frequency measurement and decoupling module connected to the winding. During operation, the high-frequency module injects a high-frequency excitation signal into the multi-pole coil winding; as the rotor rotates, eddy current coupling occurs between the conductive strip and the coil winding, causing the equivalent impedance of the coil winding to change regularly with the rotation angle. By isolating and decoupling and extracting the impedance change signal, combined with the timing relationship, the real-time rotation angle of the motor can be calculated. This invention cleverly reuses the original winding resources of the motor, eliminating the need for an external traditional encoder, and has advantages such as extremely high spatial integration, non-contact and wear-free operation, and resistance to low-frequency electromagnetic interference.

This invention discloses a novel online location method for critical branches in power systems based on impedance short-circuit ratio. The method includes: defining an expression for calculating the impedance short-circuit ratio of any connected device; obtaining a node impedance matrix for calculating the impedance short-circuit ratio of the connected device; taking the self-impedance corresponding to the access node of the connected device in the diagonal elements of the node impedance matrix as its Thevenin equivalent impedance; expressing the change in Thevenin equivalent impedance caused by branch switching using a low-order update formula, and calculating the sensitivity of the Thevenin equivalent impedance to the admittance of each branch; defining the branch influence factor and its constituent critical branch online judgment matrix according to the low-order update formula and sensitivity expression, thereby achieving critical branch location at both the device and system levels. This invention fills the current research gap in the field of critical branch location using impedance short-circuit ratio, and can provide a certain reference for the safe and stable operation of future new power systems. It is simple to implement, highly applicable, and has significant value in engineering design.

The application provides an impedance-based battery internal temperature dynamic sensing method, device, equipment and medium, wherein the method comprises the following steps: charging the battery at multiple rates in a constant temperature environment, and measuring the battery impedance and SOC data in real time; obtaining the impedance variation caused by the SOC through a static heat balance experiment, and establishing a third-order polynomial fitting model; inversely solving the battery internal temperature based on the Arrhenius equation, and optimizing the dynamic response through first-order inertia filtering; dynamically correcting the model parameters according to the battery cycle number and working condition parameters, and realizing temperature prediction accuracy calibration in a wide working condition, so as to solve the problems of inaccurate battery surface temperature measurement and damage to the battery caused by the implanted temperature sensor in detecting the internal temperature.

The application discloses a method for separating humidity and gap response of element impedance, which comprises the following steps: sequentially plating a spiral gap single-sensitive layer, a gap single-sensitive insulating layer, a gap single-sensitive electrode layer, a lead layer, a gap humidity double-sensitive insulating layer, a gap humidity double-sensitive electrode layer and a spiral gap humidity double-sensitive layer on a substrate layer to obtain a single sensitive element capable of simultaneously responding to humidity excitation and gap excitation; when the sensitive element is simultaneously applied with humidity excitation and gap excitation, the difference between the equivalent impedance change amount between the gap humidity double-sensitive electrode layer and the lead layer and the equivalent impedance change amount between the gap single-sensitive electrode layer and the lead layer is the impedance response of the sensitive element caused by the single humidity excitation, so as to separate the humidity response and the gap response. The method for separating humidity and gap response of element impedance can not only simultaneously respond to humidity excitation and gap excitation, but also separate the responses, and has the potential for developing a humidity and gap double-sensitive probe.

This invention discloses a method and system for assessing local defects in cables, belonging to the field of cable defect assessment technology. It addresses the technical problem that existing time-frequency domain reflection methods cannot effectively characterize the severity of local defects in cables, thus failing to accurately assess the extent of damage. The method includes: converting the reflected signal collected during cable inspection to the time-frequency domain to obtain a time-frequency domain signal; extracting a reference signal from the time-frequency domain signal and comparing the reference signal with other time-frequency domain signals to obtain a defect location curve; determining the defect location of the cable under test based on the defect location curve; constructing a virtual attenuation curve of the incident signal based on the defect location; determining the instantaneous reflection coefficient based on the virtual attenuation curve; and calculating the percentage of impedance change at the defect location based on the instantaneous reflection coefficient to characterize the corresponding defect severity.

This invention relates to the field of engineering surveying technology and discloses a device for measuring sediment at the bottom of bridge pile holes, comprising a rheological impedance probe, a depth transmission component, and a main control terminal. The probe contains an inertial base, a miniature impedance acquisition circuit, and a suspended torsional piezoelectric transducer; a shear wave sensing rod with shear coupling texture is rigidly connected to the lower end of the transducer, extending through the probe. The device utilizes the rheological difference between the boundary slip of fluid mud and the mechanical interlocking of solid sediment to cause a sudden change in the mechanical load of the sensing rod, thereby inducing a step change in the electrical impedance signal. The main control terminal combines depth data and impedance change characteristics to automatically locate the top surface of the sediment and the hard bottom of the bearing layer. This invention achieves accurate and objective measurement of the thickness of sediment at the bottom of pile holes through electromechanical coupling impedance analysis, solving the problem of fuzzy interface identification in complex mud environments using traditional methods.

The present application belongs to the technical field of power equipment detection, and particularly relates to a cable microstructure nondestructive evaluation method and system based on alternating current impedance spectrum. The scheme realizes the transformation of the microdefects inside the cable conductor from qualitative analysis to quantitative evaluation. The scheme proposes a feature frequency point optimization strategy based on impedance change sensitivity coefficient, optimizes the traditional long full-band scanning into fast measurement of only several key frequency points, and significantly improves the field detection efficiency. At the same time, by constructing a three-stage equivalent circuit model including a volume resistance branch, a grain boundary parallel impedance branch and a defect parallel impedance branch, the circuit parameters obtained by inversion are mapped to two quantitative indexes of grain boundary degradation and microdefect concentration, and the direct quantitative characterization of grain boundary quality and defect density is realized. Finally, with the aid of weighted least squares inversion algorithm and temperature compensation technology, the accuracy of parameter extraction and the consistency of evaluation results are ensured.

The application discloses a kind of based on lightning area's grounding resistance impact monitoring system and method, belong to electric power equipment lightning protection technical field;The system includes current monitoring module, voltage monitoring module, dynamic impedance calculation module, impact evaluation module and early warning control module;Real-time capture lightning impact current waveform and transient voltage drop by high-frequency broadband sensor, calculate dynamic grounding impedance;Using wavelet transform for time-frequency analysis, extract spectral features to identify implicit defects such as grounding body corrosion or fracture;Combined with lightning positioning system and multidimensional data fusion, construct impact risk assessment model and life prediction model, realize risk prediction and inspection cycle optimization.When impedance changes exceed threshold value, the system automatically triggers alarm and parallelly links to repair measures such as resistance reduction liquid injection;The application effectively solves the problem that traditional monitoring method cannot reflect high-frequency impact characteristics and lacks dynamic evaluation capability, significantly improves the lightning protection reliability and operation intelligent level of high thunderstorm area electric power facilities.

The present application belongs to natural gas hydrocarbon dew point detection technical field, and relates to a natural gas hydrocarbon dew point detection system based on a capacitance type Wheatstone bridge, which comprises a double-gas-path differential unit, an RCL series resonance-Wheatstone bridge sensing unit, a refrigeration unit, a signal processing unit and a temperature acquisition unit; the RCL series resonance circuit is combined with the Wheatstone bridge, the ultra-high sensitivity of the bridge circuit to slight impedance changes is transferred to the capacitance detection field, and the dielectric constant change of the capacitance after the liquid hydrocarbon is precipitated is quantified by measuring the change of the resonant frequency of the circuit, the phase change is triggered by the critical refrigeration, and the electrical calibration of the hydrocarbon dew point is realized. The RCL-temperature coupling detection technology is created, the physical process of heavy hydrocarbon phase change is converted into the sinusoidal signal change measurable by the bridge, and the problem that the gas-liquid two-phase mixed state is difficult to accurately detect is solved; the dynamic compensation technology is invented, the common-mode rejection principle of the Wheatstone bridge is used, and the common-mode noise such as the methane density fluctuation and electromagnetic interference is offset in real time through the common-mode input of the reference gas path.