308 results about "Impedance variation" patented technology

The invention provides a traveling wave cable measurement sensing method and system based on a time-frequency domain combined reflection principle, and relates to the technical field of measurement, and the method comprises the steps: arranging a high-frequency signal transmitting device and a signal receiving device at one end of a traveling wave cable; establishing a time domain reflection function and a frequency domain reflection function of the traveling wave cable; constructing a time-frequency domain joint reflection model; collecting a reflected signal of the traveling wave cable through the signal receiving device to obtain time domain data and frequency domain data of the reflected signal; carrying out conjoint analysis on the time domain data and the frequency domain data by utilizing a time-frequency domain joint reflection model, and extracting characteristic parameters of a reflected signal; calculating impedance change and signal propagation characteristics along the traveling wave cable based on the characteristic parameters in combination with a time-frequency domain joint reflection model; through analysis of impedance change and signal propagation characteristics, intrusion detection, leakage positioning and fault diagnosis along the traveling wave cable are realized.

The invention discloses a self-adaptive impedance matching method for a high-frequency signal transmission connector of a new energy vehicle, and relates to the technical field of signal processing, and the method comprises the steps: 1, obtaining the physical parameters of the high-frequency signal transmission connector of the new energy vehicle; calculating an electromagnetic field feature vector, and calculating a transmission line distribution vector of the high-frequency signal transmission connector; 2, calculating a propagation constant of a high-frequency signal transmission connector of the new energy vehicle; calculating the characteristic impedance of a high-frequency signal transmission connector of the new energy vehicle; 3, calculating a reflection coefficient; calculating an impedance error; step 4, calculating a compensation parameter vector, and generating a control signal by using an adaptive control theory according to the compensation parameter vector; and calculating the impedance matching degree according to the control signal. According to the invention, impedance change in a complex environment can be accurately dealt with, signal reflection and energy loss are significantly reduced, and transmission efficiency and signal integrity are improved.

The invention relates to the technical field of anti-electromagnetic interference, in particular to an anti-electromagnetic interference method for a flywheel energy storage system of a data center, which comprises the following steps: acquiring change rate data of the rotating speed and the angular speed of a flywheel, judging the attribution of a disturbance interval, recording change characteristics, extracting an interference identifier, comparing the interference identifier with impedance change, and generating a switching node. Frequency response and reflection coefficient characteristics of the filtering unit are detected, a coupling channel generation label is identified, and output fluctuation is evaluated to generate an anti-interference capability state label. According to the method, the surface resistivity of the shielding layer is dynamically switched according to the comparison result of the specific interference triggering identification bit and the signal link impedance change state in each disturbance stage through classification judgment and correlation marking of inertial disturbance, so that the effect of suppressing electromagnetic interference in real time is optimized; the influence degree of electromagnetic interference can be dynamically evaluated in the system operation process, and the adaptability of the energy storage system to the electromagnetic interference is judged and adjusted in real time.

The invention relates to the technical field of high-frequency signal transmission, and discloses a high-frequency signal transmission optimization method for a radio frequency coaxial connector. The method comprises the following steps: acquiring an original electromagnetic parameter sequence when a high-frequency signal is transmitted in a target working frequency band in real time, wherein the original electromagnetic parameter sequence comprises an impedance change value, a dielectric loss factor and a conductor skin depth measurement value; layered feature analysis is carried out on the data, features of a basic transmission layer, an interface reflection layer and a medium coupling layer are separated out, and a layered electromagnetic feature set is generated; identifying a key performance influence section according to the set, constructing a non-uniform frequency domain analysis grid, dividing a reflection sensitive area by using a fine frequency band, and dividing a transmission stable area by using a wide frequency band; performing time-frequency joint simulation based on the grid, and extracting a full-band dynamic transmission response spectrum; and combining with the material electromagnetic property database to optimize the structure parameter configuration scheme, generating an optimization instruction set, and loading the optimization instruction set to a processing control system to execute physical structure dynamic adjustment operation.

A method for battery power management based on battery nonlinearity characterization and compensation using a nonlinear resistor-capacitor (RC) equivalent circuit model (ECM) may include: measuring a current, a terminal voltage, and a temperature of a battery; implementing the nonlinear RC ECM comprising fixed, logarithmically spaced time constants and current dependent resistances and capacitances; constraining resistances of the nonlinear RC ECM to be nonnegative and performing a nonlinearity characterization procedure using the nonlinear RC ECM configured to characterize variations of a battery impedance with current amplitudes over a range of frequencies and create ECM parameter variations with current amplitudes by fitting impedance variations by nonlinear RC ECMs; performing online estimation of the nonlinear RC ECM using a battery current and a terminal voltage of the battery over time; and modifying the online estimated nonlinear RC ECM using ECM parameter variations to compensate for nonlinearity of the battery.

The invention relates to a weak current cable fault positioning method and system, and the method comprises the steps: preliminarily locking a fault region through monitoring the axial stress change in real time, injecting a low-frequency pulse signal in a target section, analyzing the reflection waveform characteristics, and extracting the waveform distortion characteristics in a reflection signal; dynamically adjusting the output impedance based on the amplitude attenuation and time delay relationship, and if the dynamically adjusted output impedance cannot enable the output impedance of the injected low-frequency pulse signal to be synchronous with the impedance change trend of the cable, marking as an impedance mismatch point; after an impedance mismatch point is identified, other interferences are eliminated through multi-band signal attenuation difference analysis, and the position of a fault point is determined; the system is used for implementing the method. According to the method and system, stress monitoring and electric signal detection are combined, the detection range is remarkably shortened, the positioning precision and the detection accuracy are improved, and the method and system are suitable for weak current cable fault diagnosis in a complex environment.

The invention provides a high-frequency eddy current-based metal pipeline conductivity measurement method, which comprises the following steps: designing an absolute eddy current sensor, positioning a sensor coil on the inner side of a metal pipeline and coaxially arranging the sensor coil and the pipeline, and introducing high-frequency alternating current into the coil to generate eddy current; establishing a simplified high-frequency eddy current detection analysis theoretical model, and setting geometric dimensions of a sensor and a pipeline; a Bessel function and a spatial resolution expression are used for analyzing the relation between the real part of the eddy current impedance change under high-frequency excitation and the conductivity of the pipeline; setting the conductivity of the metal pipeline according to the analysis result, and fitting the relation between the impedance change and the conductivity through a power function; and according to a coil impedance measurement result, combining the fitted power function curve, and performing inversion to obtain the actual conductivity of the metal pipeline. According to the invention, the conductivity of the metal pipeline can be effectively measured.

The invention relates to the technical field of performance testing, in particular to an electrochemical performance testing system and method for an energy storage device, and the system comprises a time synchronization triggering module, an impedance track acquisition module, a degradation state recognition module, an electrochemical abnormity monitoring module and a performance testing judgment module. According to the invention, multi-channel concurrent synchronous acquisition of voltage, current, impedance and temperature is realized by calculating sampling delay compensation time, and lithium precipitation, micro short circuit and electrode interface damage trend can be accurately identified by calculating a gradient absolute difference sequence of a voltage change rate and a current change rate and linking an impedance abrupt change rate and short-period abnormal fluctuation. In the process of judging the state of the energy storage device, open-circuit voltage distribution, charging and discharging current stability and impedance change trend are considered in a combined manner, the recognition accuracy of an active state, a degradation state and an abnormal state is improved, and the precision and reliability of electrochemical performance testing are improved.

The invention relates to the field of transformer control, and discloses a solid-state distribution transformer control system and method for improving access of a distributed power supply, which are used for solving the problem that original controller parameters are not representative due to access change of the distributed power supply when the solid-state distribution transformer is controlled. The method comprises the following steps: constructing a solid-state distribution transformer with a multi-port power regulation capability, setting initial control parameters, obtaining equivalent impedance influenced data, evaluating according to the equivalent impedance influenced data to obtain an equivalent impedance change index, judging whether the equivalent impedance is changed according to the equivalent impedance change index, and if the equivalent impedance is judged to be changed, judging whether the equivalent impedance is changed or not. If yes, dynamically correcting the initial control parameter according to the equivalent impedance change index to obtain an actual control parameter, and adjusting the output of the solid-state transformer according to the actual control parameter, thereby effectively improving the accuracy of transformer control and the reliability of energy supply.

The invention discloses a power cable insulation state evaluation method and system based on a broadband impedance spectrum, relates to the technical field of cable insulation, and is used for solving the problem that a defect grading result deviates from a real aging process of a cable. The method comprises the following steps: extracting broadband reflection data, calling a corresponding insulation aging type, converting a phase sequence in the broadband reflection data into a phase deviation coefficient for region screening, extracting a reflection peak value based on a reflection coefficient amplitude sequence, calling a corresponding impedance variation reference according to the insulation aging type, and performing region screening. The method comprises the following steps: generating impedance variation characteristics in combination with a reflection coefficient peak value, judging whether a defect grading mechanism is entered, detecting discharge pulse count and insulation recovery time of a marked division region, generating marked division defect grades according to a detection result, and distinguishing impedance variation modes corresponding to different aging forms in judgment. And the defect grading result better conforms to the actual aging process of the cable.

The invention discloses a film capacitor enabling control method and system, a medium and a program product, and the method comprises the steps: determining current sampling data and voltage sampling data of a film capacitor in a first time period; calculating an equivalent impedance sequence within a first time length, and determining distribution characteristics of impedance components under different frequencies; dividing a plurality of frequency band intervals, and calculating an impedance change rate matrix in each frequency band interval; determining energy transmission efficiency, and determining a target frequency band interval; generating a compensation coefficient, and adjusting the amplitude and the frequency by using the compensation coefficient to obtain a target sine-wave voltage; performing energizing processing on the thin-film capacitor by adopting the target sine-wave voltage within the remaining time of the energizing duration, and calculating an instantaneous power factor in real time; and when the stability of the instantaneous power factor reaches a preset condition and the leakage current is reduced below a preset threshold value, generating an enabling completion signal. According to the invention, the adaptability between the energizing effect and the actual demand of the thin film capacitor is improved, and the energizing effect is further improved.

A device for detecting an approach of a part of a user's body and / or of a portable user equipment, housed on board a motor vehicle, including: a near-field communication antenna configured to transmit and receive signals at a high resonant frequency between 3-30 MHz. The antenna includes at least one winding extending continuously in the form of a set of rods such that the rods have a variable capacitance connected to the antenna and the antenna is able to generate a capacitance variation in response to the approach of a part of a user's body; a measurer for measuring, through electromagnetic coupling with the antenna, an impedance variation or a frequency variation of the antenna. The measurer having a series resonant frequency at the selected high resonant frequency and able to detect the approach of a portable user equipment or the approach of a part of the user's body.

The invention discloses an early warning method for thermal runaway of an energy storage system. The early warning method comprises the following steps that a detection unit is installed on each unit of the energy storage system and connected with an upper computer; setting data processing and early warning judgment related parameters; acquiring electrochemical impedance spectroscopy data of the energy storage system in real time; performing optimization processing on the electrochemical impedance spectroscopy data by using a data filtering algorithm; and calculating an impedance change rate based on the electrochemical impedance spectrum data, and if the impedance change rate is greater than a set threshold value, sending an alarm signal and taking emergency measures. According to the thermal runaway early warning method of the energy storage system, the abnormal state of the battery, especially the early signal of thermal runaway, can be sensitively monitored through real part and phase angle changes under different frequencies, and higher-precision early warning is provided.

The invention relates to the technical field of automatic welding, and discloses a micro welding seam tracking method and system based on electromagnetic induction. According to the method, a high-frequency alternating magnetic field is applied to a welding seam area through an exciting coil in the micro electromagnetic sensing core; an induction coil in the electromagnetic sensing core is used for detecting magnetic field disturbance caused by geometric shape changes of the weld groove, and induction signals are obtained; processing the induction signal through a signal processing circuit integrated in the probe, namely converting the impedance change of the coil into a voltage signal, demodulating and filtering the voltage signal, and extracting a direct-current voltage signal corresponding to the deviation of the probe relative to the central position of the welding seam; the direct-current voltage signals serve as position feedback information to be output to a welding robot control system; and the movement track of the welding robot is adjusted in real time according to the position feedback information, and welding seam tracking and path deviation correction are achieved.

The invention relates to a motor bench test safety management method and device, equipment and a medium, and relates to the field of motors. The method comprises the following steps: acquiring three-phase current ripple data of an energy flow in a feedback path; performing feature analysis based on the three-phase current ripple data, and determining abnormal heat source information; calculating an impedance value and an impedance change rate of each feedback path based on the monitoring data of the feedback paths, and determining a risk path; wherein the feedback path is a path through which the energy flow flows from the motor to the power grid and / or the energy storage unit; updating a first feedback path based on the abnormal heat source information and the risk path; and performing path switching based on the first feedback path, and triggering an early warning signal. By adopting the method, the test safety can be ensured.

The invention, which relates to the technical field of distributed power generation, discloses a modularized distributed photovoltaic inverter cluster intelligent regulation and control system comprising an impedance identification module, an impedance control module, a state sensing module, a fault diagnosis and isolation module, a power distribution module and a cluster fault control module. The power grid impedance monitoring module is used for monitoring voltage and current signals of a grid-connected point of the photovoltaic inverter, calculating a power grid equivalent impedance value, an impedance change trend and a harmonic component proportion of the current photovoltaic inverter, and generating power grid impedance information. The impedance identification module and the impedance control module are arranged, adjustment is carried out based on the virtual impedance parameters, the resonance problem caused by power grid impedance fluctuation is effectively suppressed, the situation that grid-connected current distortion affects the electric energy quality is avoided, the photovoltaic inverter cluster stably operates in a power grid impedance change scene, and the power grid impedance change efficiency is improved. And the cluster grid-connected power quality and the adaptability to the power grid environment are improved.

A device for detecting the movement of part of a user's body and / or the approach of a portable user device. The device placed on board a motor vehicle. The device includes: a near field communication antenna having a resonance frequency between 3 and 30 MHz, including at least one continuous winding in the form of at least two sets of strips, each having different variable capacitance and different sensitivity, connected in parallel with the antenna. The antenna generating a different variation of impedance on the approach of part of a user's body towards the first or second set; a device measures a variation of impedance of the antenna. The device has a high series resonance frequency and detects the approach of a portable user device or movement of the body part taking place consecutively in front of the first and then in front of the second set of strips.

Method and apparatus for detecting in impedance change in a transmission line, such as a line in a computer bus. A CMOS-compatible time domain reflectometer circuit comprising a comparator is embedded in one or more chips and connected to the transmission line. The circuit measures the impedance inhomogeneity pattern (IIP) of the transmission line prior to use, and then repeatedly measures the HP during operation of the transmission line to detect a change in IIP, without Interfering with data transfer through the transmission line. The present invention can detect and locate wire-tapping magnetic probing or snooping, and Trojan and cold boot attacks on interconnecting buses between computer chips or integrated circuits in a computer system, such as on external memory buses.

The invention relates to a power distribution cable line fault positioning device, and the device comprises a control unit which comprises a system host and is responsible for receiving data of each module and carrying out the comprehensive analysis and processing; the data acquisition unit provides basic data for fault positioning through a cable path instrument, measures the broadband impedance change of the cable through a broadband impedance tester, and assists in judging the fault type and position; the preliminary positioning unit is used for transmitting a high-voltage pulse signal through a pulse current generator, accurately receiving a current pulse waveform generated during discharging or breakdown through a current coupler, and preliminarily positioning a fault point; a time domain reflection measuring instrument of the accurate positioning unit accurately determines the fault position by measuring the propagation time of the high-voltage pulse signal in the cable; and the artificial intelligence processing unit performs intelligent analysis on the data by integrating machine learning and a deep learning algorithm. According to the fault positioning device and the diagnosis method, the fault of the distribution cable line can be quickly and accurately positioned, the operation is convenient, and the implementation is easy.

Technologies directed to an energy efficient technique for Antennas as Sensors (A2S) systems used for detecting user input events are described. One electronic device includes a wireless communication component coupled to an antenna via a radio frequency (RF) path, and an RF switch selectively coupling the A2S system to the RF path. The radio sends RF signals to the antenna via the RF path in a first time window. The RF switch is controlled to selectively couple the A2S system to the RF path in the first time window. A processing device of the electronic device receives receiving an analog voltage signal representing impedance changes of the antenna in the first time window and determines, using the analog voltage signal, a user input event caused by a presence of an object in proximity to the antenna. The processing device performs an action in response to the user input event.

The invention discloses an impedance self-adaptive high-frequency probe, a probe card and a testing method, and belongs to the technical field of semiconductor high-frequency testing. When an existing high-frequency probe is used for a crimping test, a conductive probe body of the existing high-frequency probe generates mechanical deformation due to contact pressure, so that characteristic impedance is deviated, and uneven pressure in an array causes impedance dispersion. The problem is solved by coating the outer side of the conductive needle body with a composite material layer, the composite material layer is composed of an elastic insulating matrix and metal particles dispersed in the elastic insulating matrix, the metal particles have bimodal particle size distribution, and the total integral number is 30%-40%. When the probe is pressed, the composite material layer is subjected to reversible microscopic reconstruction, the effective dielectric constant of the composite material layer is increased along with the increase of the pressure, and the generated impedance change can counteract the impedance drop caused by the deformation of the conductive probe body, so that the self-adaptive stability of the characteristic impedance of the probe under the change of the pressure is realized. The impedance dispersion of the probe array can be remarkably reduced, the consistency and precision of high-frequency testing are improved, and the process compatibility is good.

The invention discloses a strong-coupling phased-array antenna unit loaded with a metasurface structure, belongs to the technical field of antenna engineering, and relates to a strong-coupling phased-array antenna. According to the metasurface structure for improving the wide-angle scanning performance of the strong-coupling phased-array antenna, on the basis of square metal patches which are periodically and uniformly distributed, rectangular patches which are specially distributed and are inconsistent in length and width are introduced, so that a non-uniform metasurface matching layer structure is formed. When the H-plane wide-angle scanning of the strong-coupling phased-array antenna is carried out, the rectangular patch can equivalently play a role of a director, and the impedance change is smoother, so that the H-plane wide-angle scanning performance of the strong-coupling phased-array antenna is remarkably improved. Meanwhile, the metasurface structure has small influence on the wide-angle scanning performance of the E plane, so that the antenna can achieve good wide-angle scanning performance in both the E plane and the H plane. The metasurface is simple in structure and has the advantages of being single-layer, light in weight and easy to process.

The invention provides a liquid leakage detection circuit, a mainboard and a liquid cooling server, and relates to the technical field of liquid cooling server design. The circuit comprises a differential signal generation module, a signal comparison module and a logic judgment module, the differential signal generation module comprises two liquid leakage detection cables, one liquid leakage detection cable is connected to a power supply voltage through a pull-up resistor, the other liquid leakage detection cable is grounded through a pull-down resistor, the two detection cables form a differential wiring pair in a PCB layout, and the signal comparison module is connected with the logic judgment module. The signal generator is used for generating differential detection signal pairs; the input end of the signal comparison module is connected with the detection cables, and the signal comparison module is used for outputting a differential voltage signal corresponding to the impedance change between the two detection cables based on the signal pair; and the logic judgment module is connected with the output end of the signal comparison module and is used for judging whether liquid leakage occurs or not based on the differential voltage signal and a preset threshold voltage signal. By adopting the differential signal design, noise interference can be reduced, and the problem of liquid leakage false alarm caused by noise interference is remarkably improved.

The invention belongs to the technical field of electromagnetic detection, and relates to an electromagnetic detection multi-level current emission system for a plateau environment and a control method. The control method comprises the steps of calculating load model impedance; analyzing an MFPWM control process, and determining an optimal control parameter by using an optimization target of transmitting spectrum intensity maximization; and MFPWM optimization control: realizing directional power distribution and independent regulation and control of each frequency component by adjusting the frequency and amplitude of each modulation signal component. A multi-level topological structure is adopted, high output voltage is achieved while switching voltage stress is reduced, and the problems that cost rises and system complexity is too high due to the fact that a traditional H-bridge inverter depends on high power supply voltage are solved; by matching with multi-frequency pulse width modulation optimization control, spectrum energy can be flexibly configured, high-frequency components of transmitted signals are enhanced, and the spectrum energy utilization rate and the signal-to-noise ratio are improved; grounding impedance changes in a high dynamic range can be accurately tracked, and the requirements of deep geological electromagnetic detection in an extreme environment are met.

The invention provides an electrostatic chuck internal defect detection method and device, a terminal and a medium, the electrostatic chuck comprises a ceramic layer and a metal layer, the method comprises the following steps: carrying out point-by-point contact scanning on the surface of the ceramic layer through an eddy current probe, and collecting an impedance change value corresponding to each scanning point to obtain impedance change data; inputting impedance change data into the impedance thickness model, and calculating the ceramic layer thickness of each scanning point to obtain ceramic layer thickness data; and processing the thickness data of the ceramic layer, and determining an internal defect area of the electrostatic chuck. According to the method, eddy current is induced in the conductive material by utilizing the alternating magnetic field, efficient and contact type defect detection is realized by analyzing impedance change, online nondestructive detection of the internal defect and the film thickness of the electrostatic chuck is realized, and the bump defect is accurately identified.

The invention discloses a method for automatically measuring resistivity in a crystal pulling process. The method comprises the following steps: arranging an exciting coil in a water cooling screen of a crystal pulling furnace, introducing alternating current to generate a magnetic field, cutting the magnetic field by utilizing rotation and lifting motion of a crystal bar to generate eddy current, measuring impedance change of the coil, and calculating the resistivity in combination with a formula. According to different pulling speeds of seeding, shouldering, shoulder rotating and equal-diameter stages in the crystal pulling process, the alternating current frequency and the sampling rate are dynamically adjusted, and the eddy current signal sensitivity is optimized. The surface temperature of the crystal bar is obtained in real time by adopting a temperature monitoring device, and the error of the temperature to the resistivity is corrected by combining first principle calculation or molecular dynamics simulation. A machine learning algorithm predicts shoulder resistivity based on a historical doping database. According to the method, real-time and accurate resistivity measurement in the crystal pulling process is achieved, the product yield is remarkably improved, resistance reverse cutting is reduced, the method is suitable for photovoltaic and semiconductor monocrystalline silicon production, and an efficient and reliable solution is provided for process optimization.

The invention relates to a turn-to-turn fault positioning algorithm based on a transformer network model, and belongs to the technical field of power equipment fault diagnosis. According to the algorithm, a transformer equivalent trapezoidal network model is constructed, a winding time domain state space equation is established and converted into a frequency domain equation, and a positioning factor is defined in combination with resonant frequency deviation and impedance change characteristics to quantify fault influence. The method specifically comprises the steps of establishing an inductance and capacitance matrix based on discrete distribution parameters, and deducing an impedance change relation before and after a fault; extracting reference impedance by taking the resonant frequency as reference frequency, and constructing an objective function by combining the positioning factor with the impedance residual error and the frequency residual error; a temperature compensation mechanism is introduced to correct a structure constant, high-frequency interference is suppressed by using a nonlinear function, and the number of fault segments is globally optimized in combination with a simulated annealing algorithm. According to the method, the problem that a traditional method is sensitive to parameter drift and noise is solved, the inter-turn fault positioning precision and the robustness under the complex working condition are remarkably improved through time domain-frequency domain joint analysis and a dynamic correction mechanism, and an efficient and reliable technical means is provided for early fault diagnosis of the transformer.

The invention provides a circuit board high-frequency characteristic detection analysis method and system based on a stub test platform, and the method comprises the steps: obtaining an S parameter of a PCB signal network based on a vector network analyzer (VNA), judging whether the signal transmission loss caused by a stub meets a detection requirement or not, and outputting the length of the stub and carrying out the TDR detection when a VNA detection result is unqualified; the size of a reflected signal of the PCB signal network is obtained based on a time domain reflectometer TDR, whether impedance change caused by a stub in a TDR curve is qualified or not is judged, and when a TDR detection result is not qualified, the specific position of the stub is output, and backdrill capacitance characteristic detection is carried out; capacitance characteristic parameters of the abnormal back drilling via hole are obtained based on back drilling capacitance characteristic detection, and the specific form of the stub is determined. The method and the system are specially used for detecting the stubs in the PCB high-density multilayer board, not only have the remarkable advantages of high precision, high speed and high reliability, but also provide solid technical support for accurate evaluation and strict quality control of product performance.

The invention discloses a coagulation and bipolar coagulation integrated control system for a surgical operating instrument, and relates to the field of medical equipment. The system comprises an interface module, an energy detection module, a storage module, a load model matching module and an energy output control module. According to the system, an energy detection signal is output to a surgical instrument before energy output, and a real-time biological impedance spectrum of a target object is obtained; determining a target model from pre-stored electrical load models according to the impedance spectrum, and calling a corresponding adaptive energy output strategy; and in the energy output process, the impedance change of the target object is monitored, and the energy parameters are dynamically adjusted, so that the energy output is automatically stopped after the impedance change conforms to the preset stable target state. The self-adaptive precise energy control based on the real-time state of the tissue is realized, the problems of tissue carbonization, adhesion or incomplete coagulation and the like are effectively avoided, and the operation safety and effect are improved.

The invention provides a magnetic field sensor based on an amorphous wire giant magneto-impedance effect, which relates to the technical field of magnetic field testing and comprises a sensitive element module, an excitation module, a signal processing module and an anti-interference module. The sensitive element module adopts a CoFeSiB amorphous wire as a core sensitive material, an enameled wire is uniformly wound on the periphery of the amorphous wire to form an inductance coil, and the giant magneto-impedance effect of the amorphous wire is converted into a voltage signal through the inductance coil; and the excitation module is used for generating and outputting a high-frequency alternating excitation signal and loading the excitation signal to two ends of the inductance coil, so that the amorphous wire generates impedance change related to the to-be-measured magnetic field intensity under the action of high-frequency current. Through modular design and multi-technology cooperation of an amorphous wire giant magneto-impedance effect, Wheatstone bridge anti-interference, a temperature compensation algorithm, a multi-layer close winding and impedance matching technology, the performance bottlenecks of a traditional magnetic field sensor in the aspects of sensitivity, anti-interference, temperature drift control and signal transmission efficiency are broken through. And high-precision and high-reliability wide-temperature-range magnetic field detection is realized.