217 results about "Skin effect" patented technology

The invention relates to a metal surface defect identification method and device based on artificial intelligence, equipment and a medium. The identification method comprises the following steps: synchronously acquiring an electromagnetic impedance signal and an optical image of a metal surface based on an eddy current sensor and an industrial camera; generating a spatially positioned interference area mask by quantifying cross-physics field interference intensity of the electromagnetic gradient and the optical edge feature; performing skin effect compensation on an electromagnetic signal by using the mask, and simultaneously performing shadow suppression on an optical image to realize physical field decoupling; a double-branch neural network is called to fuse the decoupled electromagnetic impedance features and optical texture features, and cross-modal associated joint feature expression is established; and analyzing the defect probability heat map based on the fused features, and outputting defect types and coordinates in combination with geometric feature matching. According to the method, the problem of defect feature mixing caused by mutual interference of electromagnetic-optical signals is solved, and the recognition precision and the positioning reliability of the micro defects are remarkably improved.

The invention provides a current sensor. The current sensor adopts a magnetic-core-free design, and adopts a diversion row group with a special structure to guide a target current so as to enhance the electrifying capability of the current sensor and reduce the adverse effect of a high-frequency current skin effect on measurement. Based on the structural characteristics of the diversion row group, the magnetic sensitive component for measuring the target current and the corresponding sensing signal processing method are arranged in a matched manner, so that the measurement precision of high-frequency large current is improved, the suppression capability of an interference magnetic field is improved, and the signal-to-noise ratio of an effective measurement signal is increased. The current sensor provided by the invention is compact in structure, simple in manufacturing process, strong in electrifying capability and high in signal-to-noise ratio of a sensing signal, not only widens the measuring range of the current sensor, but also effectively improves the measurement precision of high-frequency large current, and expands the application range of the magnetic-core-free current sensor.

The invention provides an optimized winding method and system for a high-frequency transformer winding. A comprehensive parameter database based on current density distribution data of a high-frequency switching power supply is established, the axial temperature of a winding layer is collected in real time in combination with a self-calibration multi-axis winding device, and tension and interlayer gap compensation parameters are generated through temperature gradient feedback. The tension parameter drives the machine to adjust the winding tightness, and the gap parameter optimizes the heat dissipation channel. And synchronously fusing the current distortion data of the LLC resonant topology and an electromagnetic field simulation result, and generating a resonant frequency adjustment signal to suppress abnormal high-frequency current distribution. And dynamic matching of winding tightness, current distribution and heat dissipation requirements is realized through cooperative control. According to the system, electromagnetic, mechanical and thermal field multi-dimensional linkage is adopted, the skin effect and hot spot concentration are reduced, the temperature rise gradient is balanced, and the high-frequency working condition stability is enhanced. According to the technical scheme, through electromagnetic, mechanical and thermal field cooperative regulation and control, the temperature rise peak value of the high-frequency winding is greatly reduced, and the efficiency is greatly improved.

The invention relates to the technical field of electromechanical hydraulic systems, and particularly discloses a low-temperature cold start control method based on high-frequency injection, which comprises the following steps: analyzing a motor state, and carrying out observation and feed-forward compensation on disturbance caused by the motor state to a load torque and a viscosity coefficient through a sliding mode observer algorithm; according to the motor state, obtaining a state equation, constructing an extended sliding mode observer equation, deriving to obtain an observer error equation, and observing the load torque; analyzing the obtained load torque, wherein the motor load torque reflects the oil viscosity; high-frequency current injection, injection frequency control, skin effect enhancement and current amplitude control are carried out in a low-temperature state according to an oil viscosity result, copper loss and a high-frequency magnetic field eddy current effect are used for assisting heat generation, and according to a final oil viscosity result, when electromagnetic heat generation viscosity is reduced and a load is reduced, an injection voltage amplitude is gradually reduced. And after a normal starting condition is reached, switching to normal id = 0 control.

The invention discloses a coil structure-based length self-sensing method for high polymer twisted artificial muscle, which comprises the following steps of: firstly, enabling the artificial muscle to be equivalent to N equidistant circular current loops, establishing an inductance calculation formula by combining a Biot-Savart law and a magnetic field superposition principle, and breaking through the limitation of a traditional solenoid model on a helical angle; then through MATLAB numerical simulation and iterative computation, fitting to obtain a power function describing the relation between inductance and length; and finally, proposing a parameter dynamic correction mode based on single-time initial inductance measurement according to complex factors such as actual magnetic flux leakage and skin effect, and realizing rapid adaptive calibration by adjusting a parameter b. In a word, the method creatively combines theoretical modeling with experimental correction, the sensing precision in a dynamic stretching scene is remarkably improved while the inductance-length macroscopic trend prediction capability is ensured, dependence on a large amount of experimental data is not needed, and the method has good engineering applicability and is worthy of popularization.

The invention discloses a low-alternating-current-loss motor stator and a stator winding conductor design method thereof. The method comprises the following steps of S1, determining structural parameters of a stator winding conductor; and S2, on the basis of a preset rapid estimation model of alternating current loss, temperature rise and motor output power based on the structural parameters, searching an optimal solution of a structural parameter combination by taking the minimum overall alternating current loss of the stator winding conductor as a target in a value range of the structural parameters of the stator winding conductor so as to obtain an optimal structural parameter combination of the stator winding conductor. When the optimal structural parameters of the stator winding are applied to the motor, the skin effect and the neighbor effect of the conductor of the stator winding under the high-frequency working condition can be effectively inhibited, so that the alternating-current loss and the temperature rise of the conductor of the stator winding are reduced.

The invention discloses a super-magnetostrictive transducer electromagnetic energy loss optimization method based on SCReg-PGNN, and the method comprises the steps: building a super-magnetostrictive bar magnetic energy loss test platform to test the magnetic energy loss under different working conditions, then carrying out the precise calculation of the electromagnetic loss of an excitation coil through considering the skin effect, proximity effect and fringe effect, and carrying out the optimization of the electromagnetic energy loss of the excitation coil. And finally, establishing an electromagnetic energy loss model of the high-power giant magnetostrictive transducer based on SCReg-PGNN, carrying out rapid calculation on electromagnetic loss characteristics of the giant magnetostrictive transducer, and finally, searching for optimal electromagnetic structure parameters of the high-power giant magnetostrictive transducer by means of a particle swarm optimization algorithm of non-dominated sorting. According to the method, high-precision modeling and response prediction of the electromagnetic loss of the transducer can be realized under the conditions of multiple working conditions and multivariable input, and collaborative optimization of structural parameters under multiple targets is further realized, so that the overall energy efficiency and the working reliability of a transducer system are improved.

The invention discloses a metamaterial RFID (Radio Frequency Identification) anti-interference antenna structure for a severe environment and a manufacturing method of the metamaterial RFID anti-interference antenna structure. The middle layer of a substrate of the antenna structure is made of corrosion-resistant polyether-ether-ketone resin doped carbon nanotubes; the upper-layer metal patch of the electromagnetic band gap unit array and the lower-layer metal layer of the annular gap are respectively attached to the upper surface and the lower surface of the middle layer of the substrate; and a self-adaptive impedance matching module is arranged at the joint of the equipment antenna and the feeder line. And each unit in the electromagnetic band gap unit array vertically penetrates through the substrate through a metalized via hole and is connected with the upper-layer metal patch and the lower-layer metal grounding layer of the substrate to form an LC resonance unit. The skin effect of eddy current on the metal surface can be counteracted through the reverse induction current, the loss of energy on the metal surface is greatly reduced, and the radiation efficiency of the metal surface is remarkably improved. In a complex electromagnetic environment, signals can be radiated and received more efficiently, the communication stability and reliability of an RFID system are effectively enhanced, and the probability of signal loss and error codes is reduced.

The invention belongs to the technical field of non-magnetic material nondestructive testing, and discloses a non-ferromagnetic material thickness and conductivity synchronous measurement method based on eddy current phase characteristics, and the method comprises the specific steps: S1, estimating the conductivity and thickness range of a to-be-tested piece based on data such as a product specification or an industrial standard; s2, determining excitation frequency according to a frequency selection criterion (high frequency enables the skin effect depth to be smaller than 1 / 3 of the thickness, and low frequency enables the skin effect depth to be larger than two times of the thickness of the sample); s3, an eddy current method is adopted to obtain the impedance variable quantity phase of the to-be-measured non-ferromagnetic material; and S4, substituting the phases into corresponding simplified model formulas respectively, and obtaining the conductivity and the thickness at the same time. Aiming at the problems of multiple calibration, blindness in excitation frequency selection, low single-parameter measurement efficiency and the like in conductivity or thickness measurement by an existing eddy current method, double-parameter output of single measurement is realized, multiple calibration and inversion calculation are not needed, the calculation is simple, rapid and accurate, the hardware cost is low, and the applicability is wide.

The application provides a hetero-composite wave-absorbing material based on attapulgite, a preparation method and application thereof. The wave-absorbing material is prepared by acid activation and high-frequency ultrasonic stirring to disperse attapulgite in a deionized water system to form an attapulgite emulsion, and the well-dispersed attapulgite fibers are uniformly coated with a carbon layer on the surface through hydrothermal stirring and high-temperature carbonization; then, a flower-like NiCo2O4 is grown in situ on the carbon-coated attapulgite to construct a hetero-interface, the carbon-coated attapulgite is used as a dielectric loss material, the flower-like NiCo2O4 is used as a magnetic loss material, through hetero-structure design, the carbon layer can inhibit the skin effect caused by the cross-linked flower-like NiCo2O4, so as to amplify the magnetic response behavior of the NiCo2O4; the hetero-interface formed between the two can significantly enhance the interface polarization, realize impedance matching, significantly improve the microwave absorption performance, and overcome the defects of impedance mismatch and structure design existing in the prior art magnetic-dielectric synergistic wave-absorbing material.

A thermal measurement system includes a temperature-controlled chamber configured to house a Device Under Test (DUT) and a first temperature sensor to measure an external temperature of the DUT inside the temperature-controlled chamber. The thermal measurement system further includes a heating device for heating a test material outside the temperature-controlled chamber and a controller configured to control the heating device to heat the test material to the external temperature measured by the first temperature sensor of the DUT inside the temperature-controlled chamber. In one aspect, a thermethesiometer indicates a skin effect of a surface temperature of the test material outside the temperature-controlled chamber.

The application discloses a kind of conductor operation risk assessment method, system and its terminal equipment, belong to conductor state assessment technical field, this method is: based on real-time operating tension and conductor structure parameter acquisition interlayer comprehensive contact thermal resistance set;Based on real-time line current, conductor structure parameter and preset skin effect coefficient calculation unit length heat generation rate, based on unit length heat generation rate and interlayer comprehensive contact thermal resistance set constructs radial temperature distribution thermal circuit model;Conductor surface layer temperature and ambient temperature are input in radial temperature distribution thermal circuit model to obtain real-time temperature;Based on real-time temperature and temperature-mechanical property degradation model obtains tensile strength, to based on tensile strength and conductor structure parameter calculation limit bearing capacity;Based on real-time operating tension to obtain actual share load and calculate safety margin, to based on safety margin and preset safety threshold value output the risk assessment result of to-be-measured conductor, realize to the precise dynamic evaluation of each layer failure risk in conductor internal.

This invention relates to the application of electromagnetic shielding composite materials, specifically to an electromagnetic shielding composite film with a gradient structure and its preparation method. Using a polymer film as the core layer, electromagnetic functional layers are sequentially deposited on both sides of the polymer core layer, and a carbon fiber felt is composited on at least one side, resulting in an electromagnetic shielding composite film with excellent electromagnetic shielding performance. The gradient multilayer structure design of this invention utilizes the principles of impedance mismatch at different interfaces and the skin effect to effectively improve the multiple reflections of electromagnetic waves between different functional layers. Furthermore, the type of polymer core layer can be changed according to different needs; using a polymer-based high-barrier film as the core layer can yield a high-barrier electromagnetic shielding packaging film that combines high barrier properties with high electromagnetic shielding.

This invention provides a leadframe packaging method and structure, relating to the field of chip packaging technology. First, a leadframe is provided. Then, wire bonding is applied to the front side of each first pseudo-pin to form a first connecting arc, achieving electrical connection between multiple first pseudo-pins and / or multiple connecting pins. Next, an adhesive layer is formed on the back side of the connecting frame, and the chip is mounted on the leadframe. Then, a molding compound is formed on the front side of the connecting frame. The adhesive layer is removed, a stepped groove is formed, and finally, a back gold layer is formed. Compared to existing technologies, this invention improves the adhesive bonding strength of the adhesive layer, effectively reducing the risk of adhesive layer detachment during molding, thereby reducing the risk of back adhesive overflow contamination during molding. Furthermore, it mitigates the skin effect during electroplating, improving electroplating quality and process efficiency, resulting in better electroplating quality and higher process efficiency.

The present application relates to the technical field of magnetron sputtering target recovery, and discloses a method for efficient recovery of a diffusion welding target using an electromagnetic induction heating technology. For the diffusion welding target using pure aluminum or an aluminum alloy as an intermediate layer, an electromagnetic induction alternating current is applied to the aluminum intermediate layer, and on the basis of the skin effect of the alternating current, a target blank and the aluminum intermediate layer are rapidly heated in the form of an eddy current. Due to the relatively low melting point, the aluminum intermediate layer can be rapidly heated above the melting point and melted, such that the target blank is separated from the aluminum intermediate layer. Finally, aluminum residues on the surface of the target blank are removed by means of machining turning, and cleaning and drying are carried out, to obtain a high-purity target blank that can be recycled. By employing rapid electromagnetic induction heating, the present application can effectively improve recovery efficiency and economic benefits while ensuring the purity of the target surface, and is environmentally friendly and pollution-free during the recovery process, and can be widely applied to 8-inch and 12-inch targets containing an aluminum intermediate layer.

To provide a power conversion device capable of suppressing local heat generation even when a skin effect occurs in an AC bus bar.SOLUTION: A power conversion device that converts DC power into AC power includes a plurality of semiconductor modules, and an AC busbar that is commonly connected to output terminals of the plurality of semiconductor modules, in which the AC busbar has a multilayer structure divided into a plurality of parts in a thickness direction, and includes an insulating layer that is partially provided between an upper plate that is an upper side and a lower plate that is a lower side.SELECTED DRAWING: Figure 5

The present application relates to a kind of heat treatment processes for improving H13 mandrel impact energy, comprising the following steps: after forging ultrafine treatment, medium frequency quenching, first tempering, second tempering, after forging heat treatment adopts ultrafine treatment process, eliminates reticular structure, obtains good spheroidizing structure, prepares good organizational condition for subsequent quenching and tempering, performance heat treatment adopts medium frequency quenching and tempering, because medium frequency induction coil heating is carried out by skin effect, heating speed is fast, grain is more fine, product heating and cooling stress is small, product straightness is good, using the heat treatment mode of after forging ultrafine treatment+medium frequency quenching and tempering can make the refining steel diameter≤φ200mm specification mandrel obtain higher strength and good impact energy, better solve the problem of low impact energy of H13 mandrel forgings below specification ≤φ200mm of vacuum refining steel production using conventional heat treatment process, meet product design and use requirement, under the premise of strength satisfying design requirement, room temperature average impact energy KV2≥20J.

The utility model relates to the technical field of cables, in particular to a feed cable for a maglev train, which comprises a conductor. The outer wall of the conductor is coated with the semi-conductive wrapping layer; the insulating layer is extruded on the outer wall of the semi-conductive wrapping layer; the semi-conductive shielding layer is coated on the outer wall of the insulating layer; and the braided shielding layer is coated on the outer wall of the semi-conductive shielding layer. According to the utility model, the inner layer of the conductor is a circular stranded conductor, the outer layer is a fan-shaped stranded conductor, impedance rise caused by skin effect can be reduced, the insulating layer is a double-layer insulating layer, the inner layer adopts a high-density polyethylene structure, and the outer layer adopts a gradient foaming structure, so that the skin depth of high-frequency current can be effectively reduced, and the service life of the cable is prolonged. In addition, the low dielectric constant foaming layer also reduces the eddy current loss of the shielding layer, the overall thermal stability of the cable is improved, and higher current-carrying capacity can be realized.

The application provides a kind of flat wire motor full slot technology of hairpin multi-wire motor stator, which adopts the topology process of end edge greater than effective edge section, realizes "full slot" (refers to equivalent resistance), and the coil resistance is 30% lower than that of X-pin and Hair-pin process motor.In the two-layer flat wire structure, the same specification of 8 turns of special-shaped wire is filled in the slot hole in self-adaptive sliding fit with trapezoidal slot, and the bundle with central cooling hole is formed. One hairpin element occupies a position to realize 16 layers of wire layout to reduce skin effect and improve motor power density and efficiency. The two ends of the hairpin center hole are connected by sealed pipeline, and cooling medium is injected for heat dissipation. The ineffective edges of the hairpin element with multiple enlarged sections are connected to phase lines by the effective edges and the end edges with multiple enlarged sections respectively to realize equivalent resistance as full slot to meet the market demand of electric motorcycle, E-bike, electric motorcycle, new energy and electric vehicle.

This application belongs to the technical field of hysteresis modeling of ferromagnetic materials, and discloses a method, system, device, and medium for simulating the hysteresis and loss characteristics of magnetic powder cores. The method includes: solving the eddy current field expression inside the metal spherical particles based on Maxwell's equations; multiplying the calculation result of the eddy current field expression by the total number of magnetic powder core particles to obtain the total eddy current loss inside the particles; dividing the surface of the magnetic powder core into equally spaced segments and setting the height of each segment. h Based on the eddy current path conduction coefficient, parameter optimization is performed using the nonlinear least squares method, combined with the skin effect, to determine the expression for the interparticle eddy current field. Based on the total eddy current loss within the particles and the interparticle loss of the metal sphere calculated according to the interparticle eddy current field expression, combined with the Preisach static hysteresis model, a simulation model of the hysteresis and loss characteristics of magnetic powder cores is constructed. This application can simulate the hysteresis and loss characteristics of granular magnetic powder core materials under high-frequency sinusoidal and non-sinusoidal excitation.

The utility model relates to a power module, a control system and a vehicle. The power module comprises a conductive part and a plurality of power chips arranged on the conductive part. Wherein the conductive part is provided with a first side and a second side, the extension direction of the first side is the same as the arrangement direction of the plurality of power chips, an included angle is formed between the extension direction of the first side and the extension direction of the second side, and the included angle is larger than 0 degree and smaller than 90 degrees. The included angle is formed between the extension directions of the first side and the second side, so that the width of the conductive part is in a gradual change state to adapt to current in different areas, and the width change of the conductive part is obtained by extending the included angle formed by the first side and the second side, so that the width of the conductive part does not suddenly change in the width change process of the conductive part; and the first edge and the second edge do not have corner angle structures caused by width change, so that the skin effect of the first edge and the second edge is effectively avoided, the current path is smoother, and the current is prevented from being locally gathered to cause local overheating.

The invention discloses a boron carbide composite ceramic tool bit and a preparation method thereof. The boron carbide composite ceramic tool bit comprises a tool bit body and a welding transition body, the tool bit body is internally provided with a boron carbide ceramic framework with a three-period minimal curved surface topological structure, three-dimensional communicating holes of the framework are filled with a metallic bond and diamond abrasive particles, and the welding transition body is a pure metallic bond transition layer. A hard wear-resistant phase is arranged on the outer surface of the combination body. The method comprises the following steps: constructing a boron carbide ceramic skeleton with a pore surface micro-nano diversion trench through additive manufacturing, and depositing an electromagnetic sensitive phase; injecting the powder into the three-dimensional communicated pores and assembling a green body; applying mechanical oscillation pressure and a high-frequency alternating electromagnetic field at the sintering temperature, and inducing an in-situ metallurgical reaction by utilizing local joule heat generated by a skin effect to finish densification sintering; and a surface hard wear-resistant phase is generated through chemical heat treatment or component in-situ reaction. Compact interlocking of the internal structure is achieved, the service life of the tool bit is prolonged, and the welding strength of the tool bit is improved.

The present application provides a kind of method for extracting the frequency domain impedance characteristics of grounding grid under the impact of intermediate frequency oscillation, belongs to the technical field of grounding grid operation and maintenance, the present application establishes the three-dimensional geometric model of grounding grid and uses the fractal dimension adaptive grid generation algorithm to divide the grid in the conductor area, establishes the multi-layer soil complex permittivity model to characterize the frequency variation characteristics of soil electromagnetic parameters, decomposes the intermediate frequency impact excitation signal into multiple narrowband components and inputs the artificial intelligence impedance characteristic extraction model based on neural tangent kernel theory, calculates the current density distribution and electromagnetic field distribution under different frequency points, extracts the skin effect depth and adjacent effect coupling coefficient, constructs the frequency response function of grounding grid and identifies the distribution position of resonance frequency point, adaptively adjusts the grid density parameters and iterative convergence precision parameters according to the ionization degree of soil, solves the problem that the frequency domain impedance characteristics of grounding grid under the condition of intermediate frequency impact are difficult to accurately extract.

A non-invasive biosignal measurement device based on skin effect removal, includes: a signal measurement instrument measuring a PPG signal of a measurement subject in contact with the skin on one side of a specific body part of the measurement subject; a signal reception unit receiving the PPG signal from the signal measurement instrument; and a ratio value calculation unit removing noise due to a skin effect from the PPG signal, and then calculating ratio values at different wavelengths for measuring a biosignal including blood sugar and glycated hemoglobin of the measurement subject. The signal measurement instrument includes a first sensor module including an optical barrier and a second sensor module for removing the skin effect.

The application discloses a MOFs-derived high-entropy alloy / carbon composite wave-absorbing material, which has a structure of a plurality of connected cluster structures; the cluster structures are composed of a plurality of connected porous hollow spherical structures; the porous hollow spherical structures are formed by accumulation of nanometer spherical particles; and the nanometer spherical particles are composed of amorphous carbon and FeCoNiCuCr high-entropy alloy nanoparticles uniformly distributed therein. The application also provides a preparation method of the MOFs-derived high-entropy alloy / carbon composite wave-absorbing material. Through component design of a MOFs precursor and carbonization process regulation, the high-entropy alloy is uniformly distributed in the carbon skeleton of the MOFs derivative, the skin effect caused by large-particle magnetic particles is effectively avoided, the electromagnetic wave loss capacity is improved, and the wave-absorbing performance is effectively improved. Meanwhile, the prepared wave-absorbing material has relatively small density, and the preparation process is simple.

The utility model provides a kind of polygonal core wire and high-speed cable, polygonal core wire includes single-core conductor and the insulating layer being arranged in single-core conductor outside, the cross section of single-core conductor is polygonal.High-speed cable, including several side-by-side arranged core wire, and the shielding layer being covered in the core wire outside, the core wire is polygonal core wire.In the case where equivalent consumables, increase the cross section perimeter of conductor, weaken skin effect, reduce power loss, reduce the impedance of cable.

The invention discloses an underground magnetic distance measurement detection method, system and device and a storage medium, and the method comprises the steps: applying excitation to a transmitting antenna, generating an induced magnetic field in a stratum space, and generating an eddy current on the surface of a metal medium of a metal part in a target well; receiving a secondary induced magnetic field generated by eddy current of the metal part in the target well through a receiving antenna and a compensation antenna which are formed by forward and reverse winding of a wire; and the distance and the orientation of the target well are obtained through the received induced magnetic field intensity in combination with spatial magnetic field response feature inversion. Due to the skin effect, attenuation of propagation of electromagnetic waves in a high-resistance stratum environment is slow, the underground magnetic distance measurement detection method based on electromagnetic induction can still detect strong magnetic field response information, and good distance measurement performance is guaranteed. According to the magnetic distance measurement detection method, the diversity and complexity of the geological environment to be detected can be improved, higher flexibility and adaptability are achieved for different mining environments, and the distance measurement precision of the area nearby the target well is improved.

The invention belongs to the technical field of microwave communication, and particularly discloses a low-loss differential transmission line structure based on a common dielectric layer. According to the invention, the technical means of alternately laminating multiple transmission layers and dielectric layers and arranging through holes for vertical interconnection is adopted, so that an electromagnetic field is distributed in the air above and below the conductor as much as possible, and the side surface of the signal transmission conductor is grooved, so that the dielectric loss of the substrate is directly reduced; signal transmission conductors are connected through high-density metalized through holes, so that signal current can flow in parallel in a plurality of metal layers through the through holes, the equivalent cross sectional area of current circulation is remarkably increased under the high-frequency skin effect, the equivalent resistivity is reduced, and the conductor loss is reduced; meanwhile, the grounding conductors are connected in parallel through the through holes, an electromagnetic field is bound around the signal transmission conductor, and radiation loss and mutual interference are restrained to the maximum extent. Compared with the prior art, the effects of greatly reducing high-frequency loss and improving signal integrity on a common dielectric layer are achieved.

This suppresses the decrease in current measurement accuracy caused by the skin effect. [Solution] The current sensor comprises a shield having an opening for taking in a magnetic field generated by a current flowing through a conductor, a magnetic field sensor disposed inside the shield and outputting a sensor voltage corresponding to the magnetic field at that location, and a detection circuit disposed outside the shield and detecting a current based on the sensor voltage of the magnetic field sensor, wherein the magnetic field sensor includes a first magnetic field sensor for detecting low-frequency magnetic fields and a second magnetic field sensor for detecting high-frequency magnetic fields, the first magnetic field sensor being disposed closer to the opening than the second magnetic field sensor, and the second magnetic field sensor being disposed further from the opening than the first magnetic field sensor.

The utility model provides a high-frequency transformer winding and a high-frequency transformer. The high-frequency transformer winding comprises a winding wound on the surface of a magnetic core, a pin connected with the winding and an isolation adhesive tape, the winding is made of copper foil, and the effective sectional area of the winding is larger than or equal to the effective sectional area of the winding under the condition that multiple strands of wires are wound in parallel. The pin comprises a plurality of groups of sheet-shaped copper foils, each group of sheet-shaped copper foils comprises a plurality of sheet-shaped copper foils, and the plurality of groups of sheet-shaped copper foils are welded and fixed with the two ends of the winding; the isolation adhesive tape is wound on the surfaces of the pins. According to the high-frequency transformer winding and the high-frequency transformer provided by the embodiment of the utility model, the copper foils are isolated by welding the plurality of copper foils and winding the isolating adhesive tapes on the pins, so that the influence of skin effect at the pins is greatly reduced, the heating of the high-frequency transformer is reduced, and the service life of the high-frequency transformer is prolonged. The temperature rise of the transformer adopting the high-frequency transformer winding can be effectively reduced in actual measurement.