831 results about "Pulse voltage" patented technology

The invention discloses a battery health state estimation method and device, equipment, a storage medium and a product, and relates to the technical field of battery health management, and the method comprises the steps: carrying out the preprocessing of a collected retired lithium ion battery sample, and obtaining pulse voltage response data under different battery charging states; inputting the pulse voltage response data into a physical constraint diffusion model to generate pulse voltage response characteristic data; generating a battery health state estimation model according to the pulse voltage response characteristic data and the regression model; and performing health state estimation on the to-be-evaluated battery according to the estimation model. According to the method, the pulse voltage response data is extracted from the multi-dimensional retired lithium ion battery sample, then the battery health state estimation model is generated through the physical constraint diffusion model and the regression model, and then the battery health state is estimated according to the estimation model. According to the method, the SOH of the retired power batteries in different dimensions can be quickly and accurately estimated, and the energy consumption in the estimation process is low.

A plasma processing system includes a pulsed voltage source configured to generate a pulsed voltage waveform having a first frequency. The plasma processing system includes a radio frequency source configured to generate a radio frequency waveform having a second frequency that is higher than the first frequency. The plasma processing system includes a junction box enclosure electrically coupling the pulsed voltage source to a direct current conductor coupled to a substrate support and further electrically coupling the pulsed voltage source to a radio frequency conductor coupled to a radio frequency baseplate. The junction box enclosure includes a pulsed voltage filter circuit coupled between the radio frequency source and the radio frequency conductor and operable to filter the pulsed voltage waveform. The junction box enclosure further includes a radio frequency filter circuit coupled between the pulsed voltage source and the direct current conductor and operable to filter the radio frequency waveform.

Embodiments of the disclosure include apparatus (e.g., plasma processing systems) and methods for the plasma processing of a substrate in a processing chamber. Some embodiments are directed to a method for waveform generation, which generally includes delivering a radio frequency (RF) waveform at a frequency for a first period of time using a RF generator and then halting the delivery of the RF waveform for a second period of time, and delivering a pulsed voltage waveform at a first voltage for at least a portion of a third period of time using a pulser, wherein the delivery of the pulsed voltage waveform overlaps with the delivery of the RF waveform during a portion of the second period of time.

The invention discloses an insulation resistance and capacitance measuring circuit and method based on monopulse double-edge analysis, and relates to the related field of the electrical insulation online monitoring technology, and the circuit comprises a detected object and an insulation detection circuit. The insulation detection circuit comprises a controlled pulse voltage source, a coupling resistance network, a current sensor, a switch control module, a signal modulation circuit and a processor. The measurement method implemented based on the circuit comprises the following steps: injecting a common-mode voltage pulse into a transmission line of the power transmission system by adopting a pulse transmitter; pulse current response is collected in real time, a current oscillogram is drawn, and a three-point sampling method is introduced to record a current value for insulation impedance parameter calculation; according to a load condition, a double-edge verification method is applied based on a pulse current attenuation characteristic, and insulation impedance parameters including a resistive component and a capacitive component are independently calculated by analyzing a pulse current rising edge and a pulse current falling edge. According to the invention, non-intrusive synchronous monitoring of resistive and capacitive components of line-to-ground impedance is realized, and the detection precision is improved.

Embodiments of the present invention relate to a technology for easily adjusting a level of static electricity required for a substrate according to a semiconductor process by injecting static electricity into the substrate or removing static electricity already formed on the substrate. A static electricity control device for injecting static electricity into a substrate disposed in a vacuum chamber or removing static electricity formed on the substrate in a semiconductor processing system, according to an embodiment, comprises: a charged particle generation unit, disposed on an upper side inside the vacuum chamber, that generates charged particles including positive ions and electrons by generating a vacuum ultraviolet ray (VUV) and reacting the VUV with a process gas inside the vacuum chamber; a grid provided with a plurality of holes, disposed on a lower side of the charged particle generation unit, that selectively pass the type of charged particles downward according to an input voltage; a substrate support, disposed below the grid and having the substrate positioned thereon, that is made of a conductive material and guides the charged particles passing through the grid toward the substrate at a predetermined density according to an input bias voltage; and a static electricity control unit that controls the static electricity of the substrate by supplying a pulsed voltage to at least one of the grid and the substrate support, wherein the grid and the substrate support are arranged so as to have a separation distance that is within four times the mean free path of the process gas according to environmental conditions of the vacuum chamber.

The invention discloses a power supply processing circuit with slow start, combination and high-side eFuse functions, and the circuit comprises a slow start module which is used for the slow start of a power supply, and the slow start time is linearly adjustable; the high-side current-limiting e-Fuse module is used for simulating a single over-current fusing function of a common fuse through two self-reset switches to carry out over-current protection when the total current of the circuit reaches a threshold value, or simulating a self-recovery fuse through a self-locking switch to carry out over-current protection in a hiccup protection mode; the low-power-consumption combination module is used for realizing low-power-consumption multi-path power supply combination through discrete semiconductor devices; and the front protection module is used for providing bypass spike pulse voltage and a reverse connection prevention function for each power supply branch. According to the circuit, the circuit design is simplified, the cost is reduced, a stable and reliable power supply is provided, and meanwhile, the circuit can be integrated into a specific board card.

The invention relates to the technical field of power electronics, and discloses a dielectric barrier discharge high-voltage series resonance system and a control method thereof. The system comprises a high-voltage series resonance circuit, an upper computer and a hardware circuit. The upper computer is electrically connected with the hardware circuit, and the hardware circuit is electrically connected with the high-voltage series resonance circuit; wherein the high-voltage series resonance circuit comprises a PFC circuit, a Buck circuit, an LC series resonance circuit, a high-voltage pulse transformer and a dielectric barrier discharge load which are connected in sequence, the high-voltage series resonance circuit converts alternating current into high-frequency high-voltage pulse voltage and provides the high-frequency high-voltage pulse voltage for the dielectric barrier discharge load, and stable dielectric barrier discharge is generated; the upper computer is used for setting parameters, the hardware circuit controls the on-off state of the Buck circuit and the LC series resonance circuit according to the parameters set by the upper computer, accurate generation and control of high-voltage pulse voltage in the dielectric barrier discharge process are achieved, and the response speed and the control precision of the system are also improved.

The invention discloses a light-sensing external trigger signal output device for laser far-field parameter analysis, comprising: a light signal detector, used for collecting laser signals irradiated on a target plate and outputting a pulse current signal; a signal primary amplification module, used for converting the pulse current signal into a pulse voltage signal and amplifying the pulse voltage signal; a signal superposition amplification module, used for amplifying the pulse voltage amplification signal output by the signal primary amplification module again; a laser pulse signal judgment module, comprising a comparator, used for setting a signal judgment threshold value, the comparator being connected to a monostable trigger, and the monostable trigger sending a trigger signal when the pulse signal is greater than the signal judgment threshold value set by the comparator; an MCU main control module, used for interrupt processing, trigger signal delay and output frequency setting, trigger signal output and transmitting a timing control signal to an imaging camera; a power management module, connected to an external power supply and supplying power to the remaining modules.

The invention discloses an energy consumption management system and method for a data center, and relates to the technical field of data center thermal management, and the method comprises the steps: carrying out the noise reduction of a structured data set through quantum harmonic oscillator coupling wavelet transform, and generating a real-time three-dimensional thermal distribution diagram through a Kriging spatial interpolation algorithm, solving a Navier-Stokes equation by combining the magneto-rheological grid wind resistance value, and extracting a heat flow vector; injecting pulse voltage into the microcapsule phase-change material layer according to the dual-channel execution instruction set to trigger phase-change heat absorption, reducing the viscosity of a target path by using a space gradient magnetic field, and generating a three-dimensional wind speed vector field; the real-time three-dimensional thermal distribution diagram is generated through the Kriging space interpolation algorithm, high-precision monitoring and analysis of the complex thermal environment of the data center are achieved, the accuracy of local hot spot recognition is improved, and therefore the energy utilization efficiency and the cooling effect are remarkably improved, and the purposes of reducing energy consumption and improving the operation stability and energy efficiency of the data center are achieved.

The invention belongs to the technical field of power electronics and semiconductor devices, and provides a transistor on-resistance high-precision comparison method, which comprises the following steps of: generating and outputting a direct-current voltage # imgabs0 # which can quickly adjust a numerical value and has load capacity through a direct-current voltage adjusting module; the grid driving module generates and outputs a pulse signal # imgabs3 # of which the voltage can be quickly adjusted based on the direct-current voltage # imgabs1 # and the pulse voltage # imgabs2 #; applying a pulse signal # imgabs4 # to the transistor to be measured through the power module, and measuring the on-resistance of the transistor to be measured under the gate driving voltage; and switching the gate driving voltage in the microsecond-to-nanosecond magnitude delay, and measuring the on-resistance of the transistor to be measured under the switching gate driving voltage based on the pulse signal # imgabs5 #. According to the method, the on-resistance of the transistor to be tested under different gate driving voltages can be tested in the pulse circuit, the measurement delay is shortened to several nanoseconds from several minutes of a traditional double-pulse circuit, and the performance of the transistor reliability evaluation circuit is effectively improved.

The invention provides a double-phase pulse circuit and a high-frequency pulse therapeutic apparatus, and relates to the technical field of medical instruments, and the double-phase pulse circuit comprises a booster circuit, N groups of pulse modulation isolation transformation circuits, an amplitude-limiting current-limiting circuit, a cascade circuit, a double-phase wave modulation circuit and a main controller, the boost circuit performs pulse modulation and boost processing on the output DC voltage of the target DC power supply to obtain an initial pulse voltage signal; n groups of pulse modulation isolation transformation circuits respectively perform isolation boosting processing on the initial pulse voltage signals to obtain N high-voltage pulse signals; the amplitude-limiting current-limiting circuit performs amplitude-limiting current-limiting processing on the N high-voltage pulse signals to obtain N high-voltage square-wave pulse signals; performing cascade processing on the N high-voltage square-wave pulse signals to obtain a target square-wave pulse signal; and performing dual-phase modulation on the target square wave pulse signal to obtain a target dual-phase pulse signal. According to the technical scheme, the effect of improving the safety of the double-phase pulse circuit is achieved.

Disclosed is a memory array testing system based on FPGA, which is used to test a memory that has not been packaged and has not had peripheral circuits added, comprising: an FPGA, which serves as a control module for the entire testing system; an excitation source, which is used to output an operating voltage for a memory cell; a read circuit, which is used to read the resistance value of a selected memory cell; an array gating module, comprising a row gating circuit and a column gating circuit, and used to select a single memory cell in an array; an upper computer, which is used to, according to a user operation, output a pulse width and amplitude of a pulse voltage, a step time, step voltage and number of scanning points of a scanning voltage, and a control signal of a word line and a bit line of a selected memory cell, and present the resistance data received from FPGA in the form of a chart. The present invention constructs a test circuit on a PCB, effectively reducing testing time and improving testing efficiency compared with traditional probe tests, and performs prototype verification before constructing a peripheral integrated circuit for a memory array.

The invention discloses a carbon dioxide electrolysis system based on pulse voltage regulation and control. The system comprises a pulse voltage source module, an electrolytic reaction module, a parameter regulation and control module, a time sequence optimization module, a reference setting module and a decision execution module. The pulse voltage source module generates an adjustable pulse voltage sequence and sets a parameter interval; the electrolytic reaction module divides reaction units and analyzes current response to generate feature vectors; the parameter regulation and control module extracts key indexes to establish voltage regulation rules; a time sequence optimization module identifies a time correlation mode dynamic calibration index and calculates a voltage offset; the reference setting module deduces an optimal pulse threshold value and generates a deviation sequence; and the decision execution module analyzes the deviation sequence to generate a regulation and control scheme. The system realizes pulse voltage dynamic optimization and reaction unit refined management through multi-module cooperation, improves the selectivity, stability and energy efficiency of carbon dioxide electrolysis, and is suitable for the field of efficient conversion of carbon dioxide.

Embodiments of the present disclosure provide a system for fast impedance tuning. The system includes a radio frequency (RF) generator to generate power, a plasma chamber to receive the power from the RF generator and a RF matching network inserted between the RF generator and the plasma chamber configured to match a plasma load impedance to a RF generator impedance using a solid state based variable capacitor. The RF matching network includes a bias circuit that applies a reverse bias to the solid state based variable capacitor to control a capacitance value of the solid state based variable capacitor. The plasma load impedance is matched with the RF generator impedance when pulsed voltage, multi-level pulsing, or RF match ignition tuning is applied.

The invention discloses a pulse modulation plasma jet generation method and application thereof, and particularly relates to the field of microelectronics, and the method comprises the following steps: I, constructing a multidisciplinary association database, modulating a high-voltage pulse power supply, and optimizing pulse waveform parameters at the same time; iI, pulse voltage is applied through a high-voltage electrode to generate plasma jet, a coupling simulation model is established, and the evolution process of the plasma jet is simulated; according to the method, the requirement of manual operation can be reduced, subjective deviation and information loss are avoided, the robustness of resisting environmental interference is improved, and the method can adapt to the high-speed and high-precision process requirement; the testing of invalid parameter combinations can be avoided, the searching capability is improved, the experiment or simulation frequency is reduced, the anti-interference capability of the jet system on working condition fluctuation is improved, and the maintenance frequency is reduced.

The invention discloses a real-time dynamic monitoring method for a new energy carbon-based material purification process, and relates to the field of material processing monitoring, and the real-time dynamic monitoring method comprises the following steps: collecting pulse voltage signals, stripping current density and electrolyte conductivity data in a graphene powder purification process, and monitoring the change of functional groups on the surface of graphene on line through an infrared spectrometer; obtaining characteristic absorption peak intensity data; according to the method, multi-source data in the purification process is subjected to collaborative analysis and intelligent regulation and control, an electrochemical parameter and material structure evolution correlation model is established, the process stability is improved through parameter self-adaptive adjustment, a closed loop integrating data acquisition, feature analysis and dynamic control is constructed, and the purification efficiency and purity of the graphene powder are effectively improved.

Some embodiments are directed to a tuning circuit. The tuning circuit generally includes: a first impedance coupled between a first terminal and a second terminal of the tuning circuit, wherein the first terminal is coupled to a generator and the second terminal is coupled to a load; a second impedance coupled between the first impedance of the tuning circuit and a reference potential node; and a signal path coupled to the first impedance or the second impedance, the signal path comprising an inductive element and a first switch coupled to the inductive element, wherein a control input of the first switch is coupled to a control input of the tuning circuit configured to receive a control signal associated with a pulsed voltage (PV) waveform.

The invention discloses a pulse generation circuit, a sterilization device and a household electrical appliance, and the circuit comprises a rectification unit which is connected with an AC power supply and is used for converting an AC power into a first DC power; the voltage conversion unit is respectively connected with the rectification unit and the energy storage unit and is used for converting the first direct current into second direct current and charging the energy storage unit; the pulse generation unit is used for generating pulse voltage based on the voltage at the two ends of the energy storage unit and providing the pulse voltage to a load; the first voltage detection unit is used for detecting voltages at two ends of the energy storage unit; and the control unit is used for controlling the voltage conversion unit to charge the energy storage unit and outputting a target pulse control signal to control the pulse generation unit to generate a pulse voltage when the voltage at the two ends of the energy storage unit reaches the target voltage so as to trigger the load to start. The circuit can reduce the power supply cost of the load.

The invention relates to a method for electrically cleaning an anaerobic membrane bioreactor in situ. The anaerobic membrane bioreactor comprises a digestion tank and a membrane tank, the membrane pool comprises a working electrode and a counter electrode; the method comprises the following steps: applying pulse voltage between a working electrode and a counter electrode in a membrane pool, and cleaning the working electrode; and the magnitude of the pulse voltage ranges from 5V to 10V. According to the method, the anaerobic membrane bioreactor is cleaned by adopting pulse high voltage, the damage to enzymes, cell structures and microbial metabolism is relieved by adopting pulse type (intermittent type) instead of direct-current voltage, a strong electrochemical reaction is initiated in the anaerobic membrane bioreactor to realize efficient in-situ cleaning of the membrane, extra dosing or membrane cleaning is not needed in the process, the operation is simple, and the cost is low. And the membrane is not required to be taken out, the system is not required to be independently cleaned, and the system can continuously run and is uninterrupted only by increasing high voltage, so that the working efficiency is improved.

The invention discloses a cutting and polishing combined machining treatment method suitable for polycrystalline silicon. The method comprises the following steps: step 1, silicon ingot pretreatment: loading historical process data of a silicon ingot in combination with a block chain technology, generating a machining parameter packet, and issuing the machining parameter packet to cutting and polishing equipment to form a machining quantization instruction set; a plasma channel is formed through combination of femtosecond laser focusing and high-frequency electromagnetic field constraint for cutting, annular laser is synchronously used for deep micro-area fusion polishing, and the surface roughness of the cut silicon wafer is reduced by means of argon protection and the surface tension self-leveling effect; 3, polishing: immersing the anode of the silicon wafer into TEMPO / [EMIM] [BF] electrolyte, and regulating and controlling by using pulse voltage; 4, cleaning and drying, wherein megasonic assisted nanobubble ultrapure water is adopted for flushing, and Malangori drying is carried out; and 5, quality control: verifying the surface appearance and the subsurface defect density, and carrying out secondary processing flow on the abnormal silicon wafer.

The invention discloses a high-temperature pipeline magnetostrictive guided wave sensor and a monitoring method, and relates to the field of ultrasonic nondestructive testing. According to the sensor, a wrinkled iron-cobalt alloy belt is used as a sensitive element, and the sensor is in dry coupling contact with a to-be-detected pipeline; the high-temperature-resistant static magnetic field coil is wound on the outer side of the aluminum pre-tightening ring in a solenoid mode, and a bias pulse excitation mode is adopted. Alternately winding the bottom end of the wrinkle structure of the wrinkle-type ferrocobalt alloy belt and the back surface of the belt material, controlling the wrinkle-type ferrocobalt alloy belt to excite a guided wave signal in a pulse section, and receiving the guided wave signal in a bias section; the dynamic magnetic field and the static magnetic field generated by the two groups of coils are perpendicular in direction, and torsional mode guided waves are generated in the high-temperature pipeline based on the reverse Weidmann effect. The sensor is easy to install and stable in performance, the whole structure is resistant to high temperature for a long time, and the engineering problem of high-temperature failure is solved. The method provided by the invention comprises the steps of optimizing pre-tightening force, pulse voltage and bias current parameters, so that the transduction efficiency is improved, and the capability of detecting new defects of the pipeline in high-temperature and variable-temperature states is enhanced.

The invention relates to a method for efficiently and deeply removing impurities in a quartz sand inclusion, and belongs to the technical field of efficient preparation of high-purity quartz and fine and deep processing of non-metallic ores. The method comprises the following steps: mixing a quartz sand raw material with insulating liquid to form slurry; the slurry is subjected to N-stage high-voltage electric pulse treatment, and intermediate quartz sand is obtained; n is greater than or equal to 2 and is an integer, and the pulse voltage of the (N-1) th-stage high-voltage electric pulse processing is greater than the pulse voltage of the Nth-stage high-voltage electric pulse processing; the highest pulse voltage of the first-stage high-voltage electric pulse processing is not higher than 500kV, and the lowest pulse voltage of the Nth-stage high-voltage electric pulse processing is not lower than 50kV; and carrying out solid-liquid separation on the intermediate quartz sand, and carrying out acid leaching treatment on solids to obtain the high-purity quartz sand. According to the method disclosed by the invention, selective crushing of high-voltage electric pulses of more than two levels is creatively combined with a mild chemical acid leaching technology to construct an efficient synergistic process system, so that targeted deep removal of inclusion impurities in the quartz sand is realized.

The invention relates to a module power supply and a power supply system, and the module power supply is constructed on a four-layer PCB, and comprises an input filtering module; the power conversion module comprises a primary winding with a tap and a primary main control chip; a power tube is arranged in the primary main control chip, and pulse voltage applied to the primary winding and energy transmitted to the secondary side are adjusted by controlling the on-off state of the power tube; after the power tube is turned off, the tap of the primary winding is used for extracting part of the primary winding to form an auxiliary winding to supply power to the primary main control chip; the secondary rectification and output filtering module comprises a secondary winding, a rectifier tube and a filter capacitor, and is used for rectifying and filtering the alternating current secondarily output by the transformer to generate direct current output; the feedback control module collects and processes the output voltage to generate a correction error signal and is used for feeding back the switching time of the power tube; and the auxiliary power supply module is used for rectifying, filtering and stabilizing the auxiliary power supply voltage output by the auxiliary winding so as to supply power to the primary main control chip.

The invention relates to a starting and power generation integrated control method based on externally distributed bosses of a permanent magnet motor, and the method comprises the following steps: determining the initial position of a rotor of the permanent magnet motor relative to a stator through a pulse voltage injection method, and applying a drive signal to a stator coil, so that the motor reaches the rotating speed at which an ignition trigger can stably detect the signal; an ignition trigger is used for obtaining boss signals and conducting shaping processing, and the specific position of the rotor relative to the stator is determined; the stator coil is electrified by utilizing the relative position of the rotor and the stator, the motor is driven to rotate, and flux-weakening voltage regulation control is carried out; and when the power-assisted condition is met, a stator coil corresponding to the permanent magnet motor is electrified by utilizing the relative position of the rotor and the stator, so that switching control from power generation voltage regulation to power-assisted driving of the motor is realized, and power-assisted driving operation is executed. According to the control method, the boss on the rotor is used for starting and power generation voltage regulation control of the permanent magnet motor, and the method is simple and easy to implement.

Catheter systems and methods for the selective and rapid application of DC voltage to drive irreversible electroporation are disclosed herein. In some embodiments, an apparatus includes a voltage pulse generator and an electrode controller. The voltage pulse generator is configured to produce a pulsed voltage waveform. The electrode controller is configured to be operably coupled to the voltage pulse generator and a medical device including a series of electrodes. The electrode controller includes a selection module and a pulse delivery module. The selection module is configured to select a subset of electrodes from the series of electrodes. The selection module is configured identify at least one electrode as an anode and at least one electrode as a cathode. The pulse delivery module is configured to deliver an output signal associated with the pulsed voltage waveform to the subset of electrodes.

The invention discloses a superconductive phase modifier excitation power unit with adjustable top value voltage and a control method thereof, and the power unit comprises the following modules which are connected in sequence: the input end of a PWM rectifier module is connected with an excitation power supply, and AC / DC conversion is carried out on the input voltage of the excitation power supply; the DC bus support capacitor module realizes output DC voltage support of the PWM rectifier module; the DC chopper module realizes DC / DC chopping output of the DC bus voltage according to the excitation requirement of the generator; the voltage smoothing module is used for smoothing and filtering the chopping pulse voltage output by the direct current chopper module; and the output end of the voltage commutation module is connected with the superconducting rotor and is used for realizing rectification of rotor excitation current and conversion of an inversion loop. According to the technical scheme, the excitation voltage and the excitation current can be adjusted stably in the steady state, the effect of the high excitation multiple can be exerted in the transient state and the dynamic state to improve the quick response capacity of the system, and meanwhile the excitation inversion capacity is achieved to achieve quick reduction of the excitation current.

Disclosed is an operation method of a neural network element using a Hall voltage. The neural network element has a hole pattern portion, and the hole pattern portion has a cross shape. When a pulse current is applied, horizontal magnetic anisotropy is formed in a ferromagnetic layer by means of spin-orbit torque, and when an external magnetic field in a direction perpendicular to the pulse current is applied, the inversion of magnetization occurs by means of additional torque. The movement of a magnetic domain wall is performed by the inversion of magnetization, spin electrons applied thereby are scattered, and a Hall voltage is generated according to the anomalous Hall effect. The generated Hall voltage increases according to the number of applications of the pulse current or pulse voltage.

The invention discloses a method for manufacturing a polyamide-imide high-heat-resistance enameled wire for a new energy automobile, and the method comprises the following steps: 1), carrying out the surface treatment of a conductor, and improving the surface roughness; 2) preparing insulating paint liquid; (3) coating the insulating paint liquid obtained in the step (2) on the surface of the conductor obtained in the step (1) for multiple times; and 4) carrying out sectional stretching treatment to finally obtain the polyamide-imide high-heat-resistance enameled wire. The polyamide-imide resin, the solvent, the epoxy modifier, the nano composite powder, the silane coupling agent and the dicumyl peroxide are compounded to prepare the insulating paint liquid, and the insulating paint liquid is coated on the conductor for multiple times, so that a compact layer can be formed on the conductor, and the insulating paint liquid has the advantages of high heat resistance, high thermal stability, high mechanical property and the like; the extreme requirements of the new energy automobile driving motor on high temperature resistance, high-frequency pulse voltage resistance and refrigerant corrosion resistance of the enameled wire are met, the manufacturing steps are simple, and the enameled wire is suitable for industrial popularization and application.

Provided in the embodiments of the present disclosure are a magnetic latching relay, comprising: a base, a contact structure, a first stationary spring lead-out member, a coil assembly and a magnetic circuit structure, wherein the contact structure is arranged on the base, the contact structure has a first end and a second end in a transverse direction, the first end is provided with a first contact group, and the second end is provided with a second contact group; one end of the first stationary spring lead-out member is connected to the first end, and the other end of the first stationary spring lead-out member extends out of the base from the bottom of the base in a vertical direction; the coil assembly and the magnetic circuit structure are arranged on the base and are located on the side of the contact structure in a longitudinal direction; and when a pulse voltage is applied to the coil assembly, the magnetic circuit structure and the coil assembly can form a constant magnetic field, a first center line of the constant magnetic field in the longitudinal direction deviates from a second center line between the first contact group and the second contact group, and is closer to the second contact group, such that the constant magnetic field is far away from the first stationary spring lead-out member. The magnetic latching relay of the present disclosure has a higher stability.

The invention discloses a method for preparing fine-grain copper and copper alloy through pulsed magnetic field and rare earth adding composite regulation and control, and belongs to the technical field of copper and copper alloy material preparation. Graphite mold casting is adopted in the method, and the method comprises the specific steps that electrolytic copper with the purity larger than or equal to 99.95 wt% or a copper alloy with specific components is prepared as a matrix raw material; after smelting, adding pure lanthanum blocks and uniformly stirring; after the melt is poured into a preheating mold, a pulsed magnetic field is applied immediately for treatment, and the parameters of the magnetic field are as follows: the pulse voltage is 180-250 V, the frequency is 4.5-6.5 Hz, and the duration time is 15-20 minutes. According to the method, the heterogeneous nucleation effect of rare earth lanthanum is combined with the melt forced convection and dendritic crystal crushing effect caused by the pulsed magnetic field to synergistically refine a solidification structure and promote columnar crystal orientation equiaxed crystal transformation, so that a cast ingot with fine crystal grains is directly obtained in the casting stage, and the possibility is provided for simplifying the subsequent processing technology.