671 results about "Pulsed power" patented technology

The invention relates to the technical field of vacuum induction heating temperature control, and discloses a vacuum induction heating temperature closed-loop control system integrated with SCADA (supervisory control and data acquisition), which is characterized in that a functional material layer with preset Curie temperature is compounded on the surface of an induction coil, and the absolute value of phase difference is analyzed by collecting voltage and current signals of the coil in real time; according to the invention, through the synergistic effect of the electromagnetic impedance sudden change characteristic of the functional material layer and the phase difference detection mechanism, non-contact accurate control of the phase change critical temperature of the workpiece is realized; and meanwhile, due to the coupling application of the asymmetric micro-pulse waveform design and the dynamic adjustment strategy, the contradiction between thermodynamic response and electromagnetic interference in a vacuum environment is effectively balanced, and the control precision and stability of the system are remarkably improved.

The utility model discloses a mandarin fish domestication feeding device which comprises a feeding pipeline and a bait temporary storage tank arranged at the upper end of the feeding pipeline, a feeding hopper is arranged at the upper end of the bait temporary storage tank, and the feeding pipeline comprises a vertical pipe with the upper end in butt joint with the bait temporary storage tank and a horizontal discharging pipe in butt joint with the bottom of the vertical pipe. One end of the horizontal discharge pipe is connected with a high-pressure water source or air source; the vertical pipe is of a multi-section telescopic rod structure. A cathode ring piece and an anode ring piece are arranged at the two ends of the vertical pipe, and the cathode ring piece and the anode ring piece are connected with a pulse generator used for outputting pulse signals and a pulse power amplifier used for controlling output voltage through wires. The fish feeding device can achieve feeding at different depths, can feed live fish, dead fish and feed according to different proportions, is simple and convenient to operate, greatly reduces the workload of manual feeding, and can be widely applied to the field of bait feeding.

The invention provides a low-altitude logistics distribution method and system based on an electromagnetic launching unmanned aerial vehicle technology, and the method comprises the steps: installing a modular electromagnetic launching system in a designated region of a first logistics park; the unmanned aerial vehicle is connected with the modular electromagnetic emission system, and cargo loading and parameter calibration are carried out; dynamically planning a flight route of the unmanned aerial vehicle from the first logistics park to the second logistics park; the electromagnetic emission system is started to accelerate the unmanned aerial vehicle, and the pulse power modulation technology is utilized to control the output of specific pulse power in different stages, so that the unmanned aerial vehicle reaches a specified take-off speed within a preset distance range; the unmanned aerial vehicle autonomously flies along the flight route and autonomously performs obstacle avoidance and path correction, and the flight route or task sequence of the unmanned aerial vehicle is dynamically adjusted; and deploying a modular catapult stopping system in the second logistics park to complete stopping of the unmanned aerial vehicle. According to the invention, the acceleration efficiency can be improved to ensure that the unmanned aerial vehicle keeps a safe distance from the obstacle while keeping the distribution efficiency.

The invention discloses a high-entropy relaxation type lead-free perovskite ceramic and a preparation method thereof. The high-entropy relaxation type lead-free perovskite ceramic is a solid solution of Na < 0.2 > Bi < 0.2 > Ba < 0.2 > Sr < 0.2 > Ca < 0.2 >) TiO3 and (K < 0.5 > Na < 0.5 >) NbO3; the content of the (K0. 5Na0. 5) NbO3 accounts for 5 to 15 mol percent of the high-entropy relaxation type lead-free perovskite ceramic. By introducing (K0. 5Na0. 5) NbO3, energy band regulation and relaxation behavior adjustment are effectively realized, the breakdown electric field intensity is remarkably improved, the energy storage performance is improved, good stability is kept under the conditions of temperature, frequency and a circulating electric field, and the actual requirements of a pulse power capacitor on a high-performance and long-life energy storage dielectric material are met.

A pulse generating system includes a primary capacitor positioned along a primary side of a pulse generating circuit, and configured to store electrical energy, and a primary switch positioned along the primary side. The pulse generating system also includes a pulse transformer configured to step up voltage from the primary side to a secondary side of the pulse generating circuit; an output capacitor; and a secondary switch positioned in the secondary side, wherein the output capacitor is electrically coupled to the pulse transformer through the secondary switch.

The invention belongs to the technical field of machine manufacturing, and particularly relates to a metal part discharge machining precision control method and system.The method comprises the steps that discharge gap multi-dimensional physical parameters are sensed in real time in a multi-modal mode, high-dimensional feature extraction and data fusion are carried out, an intelligent discharge state prediction model is constructed, and on the basis of a prediction result, a metal part discharge machining precision control system is obtained. And processing parameters such as a pulse power supply, servo feeding and dielectric liquid are adjusted in an ultra-fast and self-adaptive mode, and iterative optimization of the processing process is achieved. By the adoption of the technical scheme, the machining precision, the surface quality and the consistency of the metal part can be remarkably improved, electrode loss is reduced, and the machining efficiency is improved.

The invention belongs to the pulse power semiconductor technology, and provides a drift step recovery diode with an anode short circuit structure, a cell of the drift step recovery diode comprises an anode structure, a voltage-withstanding layer structure and a cathode structure from top to bottom, and the anode structure is a mixed anode structure comprising a diode anode part, an NPN transistor part and an isolation and insulation part; the diode anode part, the NPN transistor part and the isolation and insulation part are jointly positioned on the voltage-withstanding layer structure; the anode part of the diode comprises a P-type low-doped layer, a P-type anode region and anode metal from bottom to top; the NPN transistor part comprises a P-type base region and an N-type anode region from bottom to top, and then the P-type base region and the N-type anode region form an NPN transistor together with an N-type drift region; the anode metal is located on the upper surfaces of the P-type anode region of the anode part of the diode, the NPN transistor part and the isolation and insulation part and makes contact with the P-type anode region and the N-type anode region at the same time to form a short circuit point, namely, anode short circuit, and better pulse output characteristics and lower process difficulty are achieved.

Disclosed is a method and standard module for amplifying pulsed power. The key point of the technical solution is as follows: a method for amplifying pulsed power is formed by means of the joint action of a LASER mode of a crystal medium, a carrier multiplication amplification mode of a semiconductor medium, and a plasma breakdown amplification mode of a gas medium. Electric power which is amplified is converted into optical power first, the optical power is amplified again, and the amplified optical power is converted into electric power again by a photoelectric conversion and amplification device. A gas switch is triggered based on a photoconductive switch to generate a timing-synchronized high-power electric pulse. The high-power electric pulse may be directly outputted or distributed in multiple channels to obtain multiple timing-synchronized trigger signals. In combination with pulse charge of a capacitor, multiple timing-synchronized high-power electric pulses are outputted.

The invention provides a low-temperature heat pump liquid impact prevention and supercooling degree strengthening control method based on dual-mode self-adaptive regulation and control, which comprises the following steps: monitoring the bottom temperature of a gas-liquid separator and the change rate of the temperature, and controlling the supercooling degree of the gas-liquid separator on the basis of the difference value between the temperature and a preset safety critical temperature and the difference value between the change rate and a preset minimum temperature rise rate, constructing a liquid impact risk index; based on the liquid impact risk index, the pulse power excitation intensity is calculated, the number of opened spraying channels is selected according to the pulse power excitation intensity, the pulse duty ratio of each channel is adjusted, the high-temperature gas-state refrigerant is controlled to be injected into the bottom of the gas-liquid separator, and the liquid-state refrigerant is driven to evaporate; generating a mode switching score, and generating a mode switching signal when the mode switching score exceeds a mode switching threshold value and the temperature of the gas-liquid separator reaches a safety lower limit; and according to the mode switching signal, a supercooling degree strengthening mode is switched, and the opening degree of an economizer branch electronic expansion valve is adjusted according to the deviation between the current supercooling degree and the target supercooling degree.

The invention belongs to the field of advanced metal plastic processing, and particularly relates to a difficult-to-deform metal ultra-thin strip rolling device and method.The device comprises an uncoiler, a high-strength rolling mill and a coiler which are sequentially arranged, and the inlet side and the outlet side of the high-strength rolling mill are each provided with a pair of equal-diameter rollers; the equal-diameter roller is composed of a copper conductive roller and a ceramic insulating roller, the copper conductive roller on the inlet side and the copper conductive roller on the outlet side are electrically connected to the positive electrode and the negative electrode of the pulse power source respectively, and a strip blank on the uncoiling machine sequentially penetrates through the equal-diameter roller on the inlet side, the high-strength rolling mill and the equal-diameter roller on the outlet side and then is wound on the coiling machine. And a working roll, which is in contact with the strip blank, on the high-strength rolling mill is an insulating ceramic working roll. The pulse current in the method can induce dynamic recrystallization, an ultra-fine grain or nanocrystalline structure is obtained, and the strength and plasticity matching of the product is superior to those of a traditional process. Meanwhile, long-time high-temperature oxidation can be avoided by adopting pulse current to heat the strip blank, and the surface is bright.

An electric drive system includes an electric machine having a stator assembly and a rotor assembly. The stator assembly has a plurality of multi-phase stator windings, including a first stator winding and a second stator winding. A first inverter is adapted to feed the first stator winding. A second inverter is adapted to feed the second stator winding. The rotor assembly includes rotor windings having a single phase. A controller is configured to selectively command excitation of the rotor windings with a pulsed field current such that a direct-axis (d-axis) stator flux linkage is generated. A d-axis stator voltage is induced in the first stator winding and the second stator winding by the d-axis stator flux linkage. Pulsed power transfer is enabled through interaction of the d-axis stator voltage and respective d-axis winding currents in the first stator winding and the second stator winding.

An enhanced lighting control system is provided that utilizes updated communications technology to provide a cost and resource efficient lighting control system that allows for a retrofit installation into existing lighting systems. The lighting control system utilizes single pair ethernet connection protocols, as well as a pulsed power source, to enable the efficiencies.

The invention belongs to the technical field of pulse power, and relates to a solid-state repetition-frequency pulse generator driven by multiple paths of synchronous optical fibers and a control method, the solid-state repetition-frequency pulse generator comprises a drive control circuit, the drive control circuit is connected with a Marx generator, and an AC-DC converter and a plurality of groups of IGBT switching circuits connected in series are arranged in the Marx generator; and the AC-DC converter is electrically connected with the group of IGBT switching circuits. In the topological structure, a plurality of IGBTs connected in series only need a gate driving voltage signal to drive the lowermost IGBT switching circuit, and other IGBT switching circuits are connected in series with one another, so that the IGBT switching circuits are sequentially conducted in an extremely short time, and synchronous driving is realized. Based on the circuit structure, a plurality of IGBT devices are modularly designed, and each module only needs one driving signal, so that the number of driving circuits is reduced, and the circuit structure is more compact.

The invention discloses a battery parameter identification method and system, belongs to the technical field of battery management, and solves the problems of high model dependency, weak anti-noise capability, difficulty in balancing real-time performance and precision, lack of aging adaptability and limited generalization capability of an existing method. The method comprises the steps of exciting a battery based on a mixed pulse power characteristic test or a dynamic working condition test, collecting dynamic test data of the battery, pre-constructing a dual-polarization model, identifying and analyzing the dynamic test data by the dual-polarization model, and outputting a parameter identification result. In the invention, the dual-polarization model comprises the ohmic internal resistance and the two RC parallel networks for representing electrochemical polarization and concentration polarization respectively, and the voltage change of the battery in the charging and discharging process can be reflected more accurately, so that the electrochemical process of the battery is described more accurately; the precision, robustness and full-life-cycle applicability of battery parameter identification are remarkably improved, and key technical support is provided for a high-safety and high-reliability battery management system.

The invention relates to the technical field of water electrolysis hydrogen production, and discloses a pulse current regulation and control method for water electrolysis hydrogen production, which comprises the following steps: S1, inputting parameter information acquired in real time and basic parameters acquired by initialization into a preset control algorithm model; s2, the control algorithm model calculates the frequency, the duty ratio and the peak current of the pulse current according to the input data; s3, the pulse power supply controller generates a corresponding pulse current signal according to the received parameters and outputs the pulse current signal to an electrode of the electrolytic bath; s4, the operation state of the water electrolysis hydrogen production process is evaluated every certain time interval, deviation data is fed back to the control algorithm model, and the calculation rule of pulse current parameters is optimized and adjusted; the hydrogen generation rate is remarkably increased, so that the hydrogen production efficiency is improved, the energy consumption in the water electrolysis hydrogen production process is effectively reduced, and the hydrogen production cost is reduced.

A system for pulsed power drilling a wellbore into a subsurface formation comprises a drill bit that includes at least one electrode coupled to a power source, the at least one electrode to periodically emit an electrical discharge based on electrical pulses received from the power source. The system comprises a first port to output a first type of drilling fluid having a different composition than a second type of drilling fluid to flow downhole for removal of cuttings, wherein the electrical discharge is to be transmitted through the first type of drilling fluid and through a rock of the subsurface formation, wherein an additive or a property of at least one of the first type of drilling fluid or the second type of drilling fluid reduces mixability between the first type of drilling fluid and the second type of drilling fluid.

A method to improve performance of a pulsed power drilling tool includes determining energy transferred to a bit of a pulsed power drilling tool. In response to a determination that the energy transferred to the bit is not greater than an energy threshold within a threshold period of time, the method also includes monitoring voltage of a primary capacitor of the pulsed power drilling tool during a subsequent resonance cycle. In response to a determination that the voltage of the primary capacitor is above a voltage threshold, the method further includes toggling a primary switch that is electrically connected to the primary capacitor to maintain energy captured by the primary capacitor, charging the primary capacitor from a stored voltage to an operating voltage during a subsequent cycle.

The invention discloses a power modulation method and system for an all-solid-state power supply, and belongs to the technical field of pulse power. The method comprises the following steps: converting a target waveform into a multi-level discrete waveform, and segmenting the multi-level discrete waveform into a plurality of continuous sub-waveforms according to polarity; for each sub-waveform, identifying all level switching moments, obtaining a time-level number corresponding relation, and generating a corresponding switching action time sequence matrix; the row index of the switching action time sequence matrix corresponds to the level number, the odd-numbered columns store the turn-on time parameters of the switching devices under the corresponding level number, and the even-numbered columns store the turn-off time parameters of the corresponding switching devices; and converting the switching action time sequence matrix into period counting based on an FPGA main clock, and generating a corresponding driving pulse signal by the FPGA according to time sequence data so as to control a switching device in the all-solid-state power supply and carry out power modulation. High-real-time and high-precision control on the switch of the solid-state power supply is realized, and the effect of arbitrary waveform power modulation is realized.

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 relates to a multi-level pulse power supply and semiconductor process equipment. The multi-level pulse power supply comprises a high-frequency isolation conversion module and a switch module, wherein the high-frequency isolation conversion module is electrically connected with the switch module; the high-frequency isolation conversion module is used for accessing a direct-current bus voltage and performing voltage conversion processing on the direct-current bus voltage to generate a plurality of pre-processing voltages; and the switch module is used for responding to an externally input control signal and switching the state of the switch module so as to perform voltage amplitude modulation based on the plurality of pre-processing voltages and output a target voltage. The multi-level pulse power supply can output multi-level pulses.

Methods and devices for pressurization of a pulsed-power driver are presented. According to one aspect, independent pressurization of gas switches for each stage of the pulsed-power driver is provided. Independent pressurization is provided via an air delivery system comprising a plurality of separate stage-specific air delivery subsystems. Each air delivery subsystem is further segmented according to a plurality of sectors, each sector configured to pressurize a group of gas switches. Gas switches of a group of axially adjacent stages are pressurized according to a pressurization profile that increases or decreases the pressure in a downstream direction of the driver. Gas switches of another group of axially adjacent stages are pressurized according to a constant / fixed pressure. The increasing pressurization profile to self-triggered stages reduces misfiring of the stages. The increasing / decreasing pressurization profile to self-triggered stages and the constant pressurization to externally triggered stages control a pulse shape output by the driver.

The invention discloses a gas spark switch coating electrode and a preparation method and application thereof, and belongs to the technical field of high-power pulse. The gas spark switch coating electrode comprises a gas spark switch metal electrode substrate and a surface composite graphite coating, the preparation method comprises the following steps: (1) performing injection on the surface of the gas spark switch metal electrode substrate to form the superficial nanometer strengthening layer; and (2) sequentially depositing an intermediate transition layer, an in-situ gradient growth composite layer and a titanium-doped graphite-like layer on the surface of the superficial nanometer strengthening layer, and periodically and repeatedly depositing to obtain the titanium-doped graphite-like composite layer. The gas spark switch coating electrode has excellent conductivity, ablation resistance and strong interface bonding performance, and can obtain an effective thickness of 10-20 [mu] m by regulating and controlling cycle repetition times, so that the gas spark switch coating electrode can show uniform ablation morphology and relatively low ablation loss under high-power, high-voltage and large-current breakdown test conditions; and a long-service-life electrode solution is provided for a high-pulse power device.

The invention belongs to the technical field of semiconductor devices, and discloses a microchannel flow guide structure based on impact jet, a radiator and a semiconductor device.The microchannel flow guide structure based on impact jet comprises a first flow guide channel and a second flow guide channel, and a first fin and a second fin are arranged in the first flow guide channel; third fins are arranged in the second flow guide channel, located between the first fins and the second fins and used for enabling the cooling fluid to impact the third fins to form impact jet flow. The method is particularly suitable for the semiconductor device which emits large heat under the short-time pulse power working condition, high-strength impact jet flow can be formed, the local peak heat dissipation capacity is remarkably improved, and key technical support is provided for stable and reliable operation of the semiconductor device.

The invention provides an under-water discharge machining system and method for a radiation environment. The under-water discharge machining system comprises a pulse power supply control system, an electric spark machining head device and a servo control system. The pulse power supply control system comprises a power supply control box, a rectifier and a power amplifier which are electrically connected in sequence. And the power amplifier is electrically connected with the servo control system and the electric spark machining head device. The electric spark machining head device is provided with a feedback signal wiring connected to the servo control system. The pulse power supply control system is matched with the servo control system to drive the electric discharge machining head device to guarantee the process of the workpiece to be machined, so that the problem that conventional electric discharge machining equipment cannot be used in the high-radiation and boron-containing water environment is solved.

According to the megawatt-level half-cycle power generator based on the magnetic pulse compression system, by designing the constant-current magnetic switch reset circuit and the PID voltage stabilization charging technology, the pulse jitter characteristic within 10 ns can be achieved on the premise that megawatt-level power is output, the control precision is greatly improved, and stable output of high-power pulses is achieved. The problem that pulse generated by a traditional magnetic pulse compression amplifier is large in delay jitter is solved, high-precision output of megawatt-level pulses can be achieved, the high-precision magnetic pulse compression amplifier can be applied to a high-power transmitter needing to accurately control pulse output time, the high switching frequency and high switching efficiency of an MOS tube and the pulse compression characteristic of a magnetic switch are combined, and the high-precision magnetic pulse compression amplifier is achieved. The magnetic pulse power source has the advantages of high output power and high efficiency, improves the amplitude and phase stability of the output pulse compared with the traditional magnetic pulse power source, and expands the application scene and platform.

The utility model belongs to the technical field of pulse power supplies, and particularly discloses a pulse power supply circuit, which comprises a power supply input module, a PWM (Pulse Width Modulation) signal input module, a feedback control module, a control chip and an output module, the power input module provides working power for the control chip and the whole circuit. The PWM signal input module is used for transmitting an external PWM signal to a signal input pin of the control chip; the feedback control module collects an electric signal in the circuit and transmits a processed feedback signal to the control chip; the control chip drives the output module to output a pulse power supply to provide electric energy for a load based on an input PWM signal and a feedback signal. According to the utility model, the feedback signal acquired by the feedback control module is compared with the reference voltage, the difference value is amplified, the control chip adjusts the duty ratio of the PWM signal according to the amplified error signal, the pulse waveform is effectively optimized, and the output stability and reliability of the pulse power supply are improved.

The invention discloses a non-linear frequency conversion regenerative amplification device and a method thereof, and belongs to the technical field of laser non-linear frequency conversion. The device comprises a signal light injection unit, a regeneration amplification cavity unit and a pump light synchronization unit. The regenerative amplification cavity unit comprises an optical resonant cavity structure module, a polarization control module and a nonlinear action module. A time domain switch is formed through the polarization control module under the driving of the time schedule controller, and the preset number of times of circulation of signal light in the cavity is accurately controlled. And meanwhile, the pump light synchronization unit generates pump pulse string laser which is synchronous with the circulation process and has sub-pulse power increasing in sequence, so that the signal light and one corresponding pump sub-pulse are subjected to optical parametric amplification in the nonlinear crystal in each circulation. The space complexity of multi-stage amplification is converted into time domain controllability, high-efficiency and high-gain nonlinear frequency conversion is realized by using a single-stage compact structure, and the integration level and the stability of the system are remarkably improved.

The invention discloses an aluminum alloy hard oxidation process, and relates to the technical field of aluminum alloy part surface treatment, the aluminum alloy hard oxidation process comprises the following steps: S1, pretreatment: oil removal, alkali corrosion treatment and acid pickling neutralization; s2, hard oxidation is conducted, specifically, the pretreated workpiece is put into an oxidation tank with electrolyte and a stirring system to be subjected to stirring and oxidation treatment; and S3, post-treatment: cleaning with hot water, sealing with nickel acetate and drying in a drying oven. The process mainly comprises the following steps: carrying out pretreatment of oil removal by an organic solvent, alkali etching and acid pickling, combining sulfuric acid-citric acid-monopotassium phosphate composite electrolyte, pulsed power supply and gradient boosting oxidation, carrying out ultrasonic stirring and precise temperature control hard oxidation, and finally carrying out nickel acetate sealing aftertreatment. The four industrial problems of poor batch consistency of oxidation films of aluminum alloy workpieces, non-uniformity of complex workpieces, high energy consumption and poor compatibility to high alloy materials are thoroughly solved, and the oxidation film which is high in hardness, uniformity and corrosion resistance and saves energy is obtained.

The invention relates to the technical field of all-condition equivalent testing of flexible direct current capacitors, and discloses an all-condition equivalent testing method and system for a flexible direct current capacitor. The preset working condition voltage is adjusted according to the waveform consistency judgment result of the sample so as to equivalently simulate the alternating-current and direct-current superposed voltage and pulse power characteristics in actual operation; and collecting the surface temperature and leakage current of the sample, and finally generating an electric heating performance parameter curve through comparison and judgment with a preset threshold value. By dynamically adjusting the working condition voltage and strictly monitoring the waveform consistency, the pulse power intensity of large-current charging and discharging of the capacitor in each working period in actual operation is effectively reproduced, and the performance change under the real operation working condition is comprehensively reflected by combining environmental parameter simulation and real-time monitoring of temperature and current. The technical problems that in the prior art, the pulse power intensity of the capacitor in the continuous charging and discharging process along with large current in each work period during operation is difficult to reflect, and the real operation condition cannot be comprehensively reflected are solved.

An integrated triggering system for a pulsed-power driver is presented. The triggering system includes a pulse distribution circuit that couples externally generated trigger pulses to midplanes of a limited number of stages of the pulsed-power driver. The pulse distribution circuit includes common midplane nodes, each coupled to a group of midplanes of a same stage via respective isolating inductors. Isolating elements are coupled between the common midplane nodes of a same stage. The triggering system further includes a protection circuit configured to reduce coupling of high voltages triggered at the midplanes to external circuits while allowing the trigger pulses to couple to the midplanes. The protection circuit includes a high pass filter comprising a capacitor. The triggering system further includes a midplane biasing circuit configured to provide a reference ground to the midplanes of all stages. The midplane biasing circuit includes a resistive ladder with nodes coupled to the midplanes.