28 results about "Displacement current" patented technology

The invention relates to a method for calculating the power-on and power-off delay time performance of an electromagnetic valve, and the method comprises the following steps: obtaining the mass of a valve element of the electromagnetic valve, the spring stiffness and coil resistance data; establishing an electromagnetic valve equivalent circuit model, and listing a current equation; establishing an electromagnetic valve magnetic circuit mathematical model, and listing a magnetic field equation set; establishing an electromagnetic valve flow field mathematical model, and listing a flow field equation set; establishing a kinematic model of the electromagnetic valve, and listing a kinematic equation; using a finite element method to obtain a valve core electromagnetic force-displacement-current data table and a coil inductance-displacement-current data table; a finite element method is used for obtaining a valve element aerodynamic force-displacement data table; and obtaining the power-on and power-off delay time through data analysis processing and solving of the partial differential equation set. According to the method, prediction of the opening and closing delay response time of the electromagnetic valve is more accurate, visual adjustment in the simulation process is achieved, and the time for obtaining the response time of the electromagnetic valve and the test cost are greatly reduced while the preset precision requirement is met.

The invention discloses a shielded cable electricity testing method based on ground loop impedance potential lifting, and relates to the technical field of measurement. The electroscope comprises an electricity testing step, an induction electrode on the cambered surface of the electroscope is used for obtaining induced electricity, a broadband direct sampling framework is formed on the physical level, and broadband direct sampling of millivolt-level power frequency displacement current characteristics is achieved. Based on a variational mode decomposition-Duffing oscillator fusion weak signal extraction algorithm, a variational mode decomposition algorithm is utilized to adaptively strip broadband noise and higher harmonics, a reconstructed signal is subjected to scale normalization and then introduced into a critical chaotic state Duffing oscillator algorithm, phase transition of a phase track from a chaotic attractor to a large-scale limit cycle is monitored, and a weak signal is extracted. A non-linear dynamic weak signal extraction algorithm is formed on the algorithm level, and weak power frequency features masked by strong noise are accurately recognized; a broadband direct acquisition framework and a weak signal extraction algorithm form a dual detection framework, and a quasi-induction electric signal is detected and judged in the live part verification process of the shielded cable.

This invention provides a method and system for three-dimensional high-frequency controllable source electromagnetic numerical simulation with dual-source excitation. The method constructs a single-source electromagnetic field grid model and a three-dimensional spatial domain total field equation, converting it into a quadratic field control equation by separating the primary and secondary fields. Fourier transform is used to transform the equations to the wavenumber domain, and shape function interpolation is performed iteratively to obtain the wavenumber domain numerical solution. A single-source forward excitation solution is obtained through inverse Fourier transform. A single-source reverse excitation solution is obtained by reversing the current direction. Finally, the forward and reverse solutions are vector-superimposed to obtain the dual-source excitation simulation result. This invention solves the technical problems of existing technologies, such as simulation distortion caused by neglecting displacement current in the 100kHz-10MHz frequency band, numerical calculation interference from field source singularities, and low spatial resolution of complex underground anomalies under single-source excitation. By simulating gradient field response characteristics through dual-source reverse superposition, the sensitivity and exploration resolution of underground target boundaries are significantly improved.

The invention discloses a non-contact voltage high-precision inversion optimization algorithm, and belongs to the technical field of distribution network voltage measurement, and the algorithm comprises the following steps: designing a non-contact voltage sensor probe of a double-coupling mechanism based on a displacement current method, obtaining the voltage of a to-be-measured line through measuring the value of displacement current, and obtaining the voltage of the to-be-measured line based on the voltage sensor probe. The method comprises the following steps: acquiring response voltage signals in different periods through an MOSFET gating measurement loop, establishing a voltage measurement model considering frequency deviation of a power system, and correcting phase angle deviation caused by frequency deviation and estimating voltage by adding a response equation and a Newton iteration algorithm; the method can optimize the performance of the sensor probe, and has the advantages of prominent deployment safety and convenience, high environment and system adaptability, remarkably improved measurement precision, efficient and reliable algorithm and the like.

This application discloses a transformer, a switching power supply, and an air conditioning device. By setting a first shielding layer between the magnetic core and the primary winding, and electrically connecting the first shielding layer to the primary ground, the magnetic core potential is clamped to the primary ground potential, thereby eliminating the displacement current of the magnetic core to ground. An auxiliary winding is set between the primary winding and the secondary winding. The corresponding terminals of the auxiliary winding are opposite to those of the primary winding. The auxiliary winding is connected to the primary ground. The auxiliary winding includes Nb turns of coil, the primary winding includes Np turns of coil, and the secondary winding includes Ns turns of coil, where 2Nb≤3Ns-Np. In this way, a reverse displacement current can be actively created inside the transformer to offset the original interference current, thereby significantly reducing the net current flowing to ground.

The invention relates to the technical field of air sterilization and discloses a distributed multi-stage plasma air sterilization system and method applied to a large space, and the distributed multi-stage plasma air sterilization system comprises an air flow channel, multi-stage plasma generation modules distributed in the air flow channel, and a pulse driving circuit, each stage of plasma generation module comprises a dielectric barrier discharge electrode, the pulse driving circuit detects a charge composite waveform in an electrode gap in a pulse fallback stage so as to obtain a displacement current recovery time constant, and the secondary ozone concentration and the space charge characterization quantity in a flow channel are determined according to the deviation between the constant and a recovery reference. According to the invention, the self-limiting feedback of the product is realized by utilizing a discharge physical process, the contradiction between the disinfection yield demand and the ozone safety threshold value in a large-space environment is effectively reconciled, and the energy self-limiting performance is improved. And the operation safety of the distributed system in a complex environment is ensured.

This application relates to a high-precision non-invasive voltage measurement method, apparatus, computer device, and storage medium based on dual-frequency injection. The method includes: injecting a first detection signal and a second detection signal into a measurement circuit; acquiring a displacement current signal in the measurement circuit; performing signal separation on the displacement current signal based on the signal frequency to obtain a first detection current, a second detection current, and a rated current; and determining the voltage to be measured based on the rated current, the detection voltage, the first detection current, and the second detection current. By injecting the first and second detection signals into the measurement circuit, and obtaining the first detection current, the second detection current, and the rated current based on the obtained displacement current signal, the voltage to be measured is finally determined using the rated current, the detection voltage, the first detection current, and the second detection current. By injecting two reference signals of different frequencies, the influence of resistance and inductance in the measurement circuit can be effectively offset, thereby improving the accuracy of voltage detection.

According to the 4H-SiC MOSFET chip and the main junction region structure and the manufacturing method thereof, the main junction region structure of the 4H-SiC MOSFET chip is characterized in that an N-drift layer is formed on a substrate, a P well is embedded in the N-drift layer, a field oxide layer is arranged on the surface of the P well, the field oxide layer is divided into a plurality of field oxide blocks within the range of the P well, electric field distribution of a transition region is optimized, and the field effect of the N-drift layer is improved; electric field peak intensity is weakened, electric field concentration is avoided, dynamic avalanche breakdown probability is reduced, chip breakdown voltage performance is guaranteed, capacitance distribution of a transition area is adjusted, coupling effect of parasitic gate-drain capacitance is reduced, displacement current is reduced, gate misconduction is avoided, and local temperature rise and stress of the transition area are relieved. The stress transition layer is arranged between the field oxide layer and the P well, thermal expansion and cold contraction differences are reduced, the interface matching performance is improved, the stress transition layer is matched with the field oxide layer, thermal stress concentration can be reduced, the interface crack and stripping risk is remarkably reduced, and the structural stability of the main junction region is improved.

This invention discloses an adaptive compensation voltage divider device based on self-powered bushing end screen. It includes an energy acquisition module that obtains displacement current from the bushing end screen side as power for the voltage monitoring device, and uses a clamping network to protect the circuit from overvoltage damage, converting the AC signal into DC energy. A modulation output module adjusts the equivalent impedance according to the characteristics of the downstream load to optimize power conditions, stores electrical energy, and outputs a measurement signal corresponding to the bushing operating voltage in a timely manner. An adaptive compensation module calculates the operating voltage based on the voltage sampling signal, dynamically updates the compensation coefficient to ensure the accuracy and stability of the voltage divider ratio, and monitors system status feedback information to update the compensation parameters. Implementing this device ensures the accuracy and stability of voltage monitoring, eliminates interference from external leads, and significantly improves the system's anti-interference capability and long-term operational reliability.

By forming a gate lead-out part (232) so as to cover a position (P3) that is at the furthest distance within an inner end portion (241a) of a field insulation film (24) from a contact region (20), electrical field concentration when generating a displacement current is reduced, and dV / dt capability is increased.

The application provides a transient voltage suppressor based on path decoupling and electric field coupling triggering and a manufacturing method thereof. The transient voltage suppressor comprises at least one device unit. The device unit comprises a first electrode and a second electrode, a triggering unit, a main turn-on unit and a coupling unit. The triggering unit comprises a second-conductivity high-doped region and a first-conductivity high-doped region. A local PN junction region is formed between the second-conductivity high-doped region and a first-conductivity low-doped drift region, and the first-conductivity high-doped region is arranged on a coupling dielectric layer. When the local PN junction region is subjected to avalanche breakdown, displacement current is formed through the coupling dielectric layer and coupled to the main turn-on unit, thereby triggering the main turn-on unit to form a longitudinal low-resistance main turn-on path. The main turn-on unit is in a high-resistance state under a static bias condition, so that the static equivalent junction capacitance of the device is mainly determined by the local PN junction region, thereby balancing low junction capacitance, low dynamic resistance and high surge current bearing capacity.

The invention discloses a heat dissipation shielding device packaging structure and a process thereof. The process comprises the following steps: mounting a film block on a substrate, stacking a metal block on the film block, integrally packaging and grinding to expose the metal block, etching a packaging material to form a groove, and exposing the surface of the substrate at the bottom of the groove; an adhesive layer is coated on the etched covering surface, and an adhesive layer is also coated in the groove; electroplating a circuit: electroplating a circuit layer on the surface of the adhesive layer along the adhesive layer coating path, and continuing to encapsulate the adhesive layer and the circuit layer; turning over the whole packaging body up and down, exposing the adhesive layer at the position of the film block and the groove, removing the film block, horizontally grinding the surface until the circuit layer at the groove is exposed, and exposing the metal block at the same time; according to the invention, the circuit layer is used as an internal shielding structure, the displacement current is absorbed and guided to the ground, the near-field intensity is reduced, the internal parasitic coupling is inhibited, the distribution of a local electric field is controlled, and a first barrier is formed.

The invention discloses an electric field energy taking device and method, and the device comprises an energy taking pole plate which comprises an inner pole plate and an outer pole plate, the inner pole plate is arranged adjacent to a power transmission line, the outer pole plate is arranged at the periphery of the inner pole plate in a grid-shaped structure, and a rectification circuit which is connected with the inner pole plate and the outer pole plate and is used for converting a space displacement current Id into a conduction current Ic, the energy storage capacitor is connected to the output end of the rectifying circuit; wherein the outer polar plate is physically cut to form at least two independent grid-shaped units, and equivalent distributed capacitance Ch is increased by utilizing an edge effect, so that the energy taking efficiency per unit area is improved under the condition that the total area of the polar plate is reduced. The grid-shaped electric field energy taking pole plate and the energy taking method thereof have the beneficial effects that the equivalent distributed capacitance is increased by actively utilizing the fringe effect through three specific grid-shaped structure designs of a beam-shaped structure, a ring-shaped structure and a beam ring composite structure, so that the original energy taking efficiency is still kept when the area of the pole plate is reduced by 10%, and the energy taking efficiency per unit area is improved by more than 10%.

The application discloses a kind of self-driven polarization detectors based on metasurface, belongs to polarization detection technical field.Self-driven polarization detector based on metasurface, including substrate, the upper surface of substrate is provided with several metasurface structure units, metasurface structure unit includes metal patch and bottom patch, metal patch is located above bottom patch, metal patch has non-centrosymmetric structure.Metal patch is Y type metal patch, the material of Y type metal patch is gold, the material of bottom patch is graphene.The self-driven polarization detector based on metasurface and application described in the application, when polarized light is irradiated to the surface of detector, gold-graphene metasurface will produce similar vector photoelectric current with displacement current, according to the difference of photoelectric current size and direction, realize the detection to polarized light, with the advantages of small volume, high degree of integration.

The application provides a full current wave impedance apparent resistivity detection method and system, and belongs to the technical field of survey geophysics. The method realizes apparent resistivity detection of a target area by using a radio frequency magnetotelluric method (RMT). The method mainly comprises the following steps: collecting detection data, using a sensor with a frequency range covering 1 MHz to obtain orthogonal electric field components and magnetic field components at measuring points in a detection area; obtaining dielectric constants and magnetic permeabilities of a shallow surface layer; and using the detection data to calculate full current wave impedance apparent resistivities at the measuring points by using a full current wave impedance apparent resistivity model which is not limited by quasi-static conditions. In the application, the full current wave impedance apparent resistivity model considering displacement current is derived from Maxwell equations, so that the model is not limited by quasi-static conditions and will not cause distortion of apparent resistivity at high frequencies due to non-compliance with quasi-static assumptions. The model can measure both artificial source excited electromagnetic fields and natural electromagnetic fields.

The invention discloses a method for predicting Se vacancy infrared nonlinear optical response in few-layer PtSe2, and the method comprises the following steps: S1, constructing a few-layer PtSe2 model, and carrying out the in-plane expansion; s2, introducing Se vacancy into the model after cell expansion; s3, performing structural relaxation on the Se-containing vacancy structure until atomic force and energy converge; s4, calculating an electron energy band structure of the relaxed structure based on a density functional theory; s5, constructing a maximum localization Wannier function, and fitting the electron energy band structure obtained in the step S4; s6, calculating an in-plane nonlinear displacement current component of the few-layer PtSe2 in an infrared band; and S7, analyzing the change of the nonlinear displacement current component obtained in the step S6 in the infrared band, and predicting the influence of Se vacancy on the infrared nonlinear optical property. The infrared nonlinear optical property prediction method provided by the invention is low in cost and high in precision.

A substrate shielding structure and a method for forming the same, wherein the structure comprises: a substrate; a shielding layer on the substrate, the shielding layer comprising a plurality of mutually separated unit regions arranged along a first direction, each of the unit regions comprising a plurality of coil regions arranged along a second direction, adjacent coil regions being electrically connected to each other, each of the coil regions comprising a first coil, the first coil comprising at least one coil structure, a projection of the coil structure on a surface of the substrate being in an "S" shape; and a guard ring outside the shielding layer and surrounding the shielding layer, the guard ring being grounded and being electrically connected to the shielding layer, so as to reduce an induced magnetic field in the substrate shielding structure, inhibit the formation of a displacement current and a substrate eddy current, and further improve a quality factor Q of the inductor.

The application discloses a method for testing and extracting carrier injection barrier in dielectric, which is based on the relationship between the injection current density and the electric field intensity obtained by the injection charge quantity change rate and the electric field change, and the testing and extraction of the dielectric carrier injection barrier, and comprises the following steps: preparing a dielectric sample; performing electrode unipolar carrier injection test; calculating the conductive current of the carrier migration in the dielectric and the displacement current at the electrode and dielectric interface; calculating the carrier injection current density at the electrode and dielectric interface; correlating the current density and the electric field intensity at the electrode to obtain the carrier injection current density-electric field intensity relationship curve at the electrode interface in the dielectric; performing analysis and fitting to extract the carrier injection barrier. The testing and extraction method can truly reflect the electrical performance parameters of the dielectric under different electric field intensity working states, provides parameters for the charge transport simulation in the dielectric, and has significant scientific and economic benefits.

The application discloses a quality detection method and system of a high-voltage chip under dynamic working conditions. The method comprises the following steps: after ending a preposed dynamic stress working condition, controlling a load loop to discharge residual charge of the chip to be detected to an electrical zero state; acquiring transient characteristics of the preposed working condition to calculate diagnostic pulse parameters; injecting a diagnostic pulse, establishing equipotential shielding between a test cable core and a protective layer, and collecting total leakage current data; calculating a thermal background leakage current estimation value, and performing differential operation on the total leakage current data to separate an electric field degradation leakage current sequence; extracting characteristic parameters of the sequence and comparing the characteristic parameters with a preset reference matrix, and outputting a quality detection result. The system comprises a main control module, an excitation source, a load board and a measurement module. The application effectively decouples thermal effects and insulation degradation, blocks displacement current interference caused by cable parasitic capacitance, and improves the detection accuracy of early insulation defects of high-voltage chips.

This application discloses a power device. The power device includes a silicon layer, an insulating dielectric layer, and an emitter metal layer. The silicon layer includes a floating P-region, a first trench, and a second trench. The first trench and the second trench are spaced parallel to each other along a second direction. The floating P-region is located between the first trenches or between the first trench and the second trench. The insulating dielectric layer is stacked on the silicon layer, and multiple first contact holes communicating with the floating P-region are etched into the insulating dielectric layer. The multiple first contact holes are spaced apart along a first direction. The emitter metal layer is stacked on the insulating dielectric layer, and the emitter metal layer at least partially passes through the first contact holes and connects to the silicon layer. The power device of this application reduces displacement current and enhances the gate's control over EMI and turn-on losses by spaced-apart first contact holes communicating with the floating P-region. At the same time, in areas where first contact holes are not provided, the floating P-region retains the effect of carrier injection, resulting in a lower on-state voltage drop.

The invention discloses a residual magnetism type operating mechanism control system and method, and relates to the field of electrical equipment, and the system is characterized in that a first power tube to a fourth power tube in a controller form a bridge circuit, the output end of the bridge circuit is connected with an opening and closing coil of a residual magnetism type operating mechanism, and an opening and closing capacitor is connected with the bridge circuit in parallel; the main control chip is used for controlling the second power tube and the third power tube to be switched on according to the first residual magnetism amount advance compensation value from opening to closing until the residual magnetism amount feedback value of the magnetic conductive rod is equal to the first residual magnetism amount advance compensation value; in the upward movement process of the movable alloy magnetic core, according to a first residual magnetism quantity given value, a displacement value of the movable alloy magnetic core and a current value of the opening and closing coil, a displacement-current double-closed-loop algorithm is used for controlling on-off of a second power tube and a third power tube; and when the movable alloy magnetic core moves to a switching-on position, the second power tube and the third power tube are controlled to be switched off, and the fifth power tube is controlled to be switched on. The accuracy of operation control of the operating mechanism is improved, and stable regulation and control of the operating mechanism are realized.

The application discloses an integrated LLC resonant converter structure realizing displacement current balance and suppression, and belongs to the field of power electronic conversion. The resonant inductance is divided into two independent resonant inductances Lr1 and Lr2, and the two inductance values are equal. The two resonant inductances are arranged on the upper bridge arm and the lower bridge arm of the LLC converter respectively, the magnetic coupling characteristics of the circuit are optimized, the resonant network is completely symmetrical, and thus the resonant current imbalance degree is theoretically eliminated. In the case of ensuring the consistency of the resonant current symmetry degree, the capacitance value of the resonant capacitor is halved, and the number of the resonant capacitor is reduced by half, so that the primary side ZVS is ensured. Meanwhile, the resonant capacitor Cr is placed in series between the primary sides of the second and third matrix transformers. The resonant capacitor Cr is combined with the first, second, third and fourth matrix transformers through integration, the position of the resonant capacitor determines that the resonant capacitor has a natural integrated advantage, so that the overall stability and response speed of the system are enhanced.

The invention provides a metal oxide arrester state monitoring method and system, and relates to the technical field of arresters. The method comprises the following steps: acquiring leakage current waveform data in the operation process of a lightning arrester, and decomposing by adopting a db2 wavelet filtering and displacement current method to obtain a resistance current waveform and a capacitance current waveform; performing multi-feature extraction and fusion based on the two types of waveforms, constructing a first feature vector set, and expanding the first feature vector set into a high-dimensional second feature vector set; and inputting the classification result into a classification system based on a decision tree-support vector machine for training and diagnosis, and outputting a classification result. According to the method, a combined strategy of wavelet filtering and displacement current decomposition is utilized to remarkably improve the denoising and separation precision of a leakage current signal, and high-sensitivity identification of the state of the lightning arrester is realized; the robustness and the diagnosis intelligence level under complex working conditions are enhanced through multi-feature fusion and a joint classification mechanism, and the method has high practicability and popularization value.

This invention discloses a method and system for extracting discharge pulses from power electronic devices based on deep learning. The method includes: acquiring and preprocessing multiple cycles of current signals and square wave voltage signals to form a dataset; extracting physical prior features based on the square wave voltage signals, including region partitioning probability, theoretical displacement current, and voltage derivative features; constructing a deep neural network integrating a global-local attention mechanism; building an adaptive partitioned physical constraint loss function, including region-weighted reconstruction loss, monotonicity / flatness / energy conservation constraint loss, frequency domain consistency loss, and smoothing regularization loss; training the neural network to reconstruct the displacement current and calculating the residual to obtain the discharge pulse. This invention achieves end-to-end automated discharge pulse extraction without manual parameter setting, exhibits excellent generalization performance under small sample conditions, and significantly improves the efficiency and accuracy of power electronic device quality inspection.

An example apparatus includes a displacement current sensor configured to measure for a subject one or more sensed electrical signals, wherein the displacement current sensor comprises at least one electrode. The apparatus also includes circuitry configured to process the one or more sensed electrical signals from the displacement current sensor to obtain an electrocardiogram (ECG) signal and a variable impedance signal caused by an arterial pulse wave, wherein the circuitry configured to process the one or more sensed electrical signals to obtain the electrocardiogram signal and the variable impedance signal caused by the arterial pulse wave is configured to measure the variable impedance signal caused by the arterial pulse wave as a modulation of an applied electrical reference signal.

This invention relates to the field of discharge tubes and discloses an impedance adjustment method and system based on a radio frequency (RF) power supply. The method includes: acquiring the displacement current signal at the electrode of the discharge tube; calculating the second-order time-domain derivative of the displacement current signal to characterize the gas ionization evolution trend; locking the ionization initiation prediction point when the second-order time-domain derivative reaches a preset inflection point threshold; determining the RF frequency correction amount based on the gas pressure and driving voltage within a feedforward window period of 15μs to 25μs before the ionization initiation prediction point is reached; and driving the RF power supply frequency to jump to a preset matching frequency point. This invention utilizes the leading physical characteristics of the ionization physical latency to achieve preset matching, eliminates the reflected power impact of the plasma generation transient, and ensures that the RF energy field and load impedance achieve physical-level spatiotemporal alignment and conjugate matching.

A switching component configured to switch an electrical signal, the switching component includes a substrate bearing several elementary components each ensuring the switching of the electrical signal, a baseplate onto which the substrate is fixed, the baseplate being configured to discharge heat emitted in the switchings of the switching component, two electrical conductors each connected to one of the elementary components and respectively ensuring the input and the output of the elementary component concerned for the signal (IC) to be switched, a magnetic core produced in a ferromagnetic material, the magnetic core surrounding the elementary component concerned without surrounding others of the elementary components and being disposed in the component in such a way that a displacement current between the surrounded elementary component and the baseplate induces a magnetic induction in the magnetic core, and in such a way that the path followed by a conduction current of the electrical signal switched by the component does not form a turn around the magnetic core.

The embodiment of the invention provides a reactance and capacitor fused voltage measurement dual-measurement method and device, and the method comprises the steps: carrying out the fast Fourier transform of a preprocessed induced electromotive force signal and a preprocessed capacitive displacement current signal, and generating a frequency domain characteristic decomposition result, the inherent difference of the reactance channel and the capacitance channel in amplitude-frequency and phase-frequency characteristics is analyzed, and a frequency-variable transfer function matrix is constructed; performing amplitude and phase compensation on fundamental components and harmonic components of subsequently input induced electromotive force signals and capacitive displacement current signals according to the frequency-dependent transfer function matrix; performing complex plane vector synthesis on the compensated reactance signal and the compensated capacitance signal, and calculating a confidence index; and the weight factors of the two paths of signals in fusion are adjusted according to the confidence index, and a fusion voltage measurement value is output, so that the overall precision, reliability and anti-interference capability of the high-voltage measurement system are effectively improved, and the broadband measurement requirement in a complex power grid environment can be met.