43 results about "Pulse power systems" patented technology

The invention particularly relates to a discharge machining simulation control system for a nuclear power plant in a high-radiation boron-containing water environment, which belongs to the technical field of special maintenance in the high-radiation environment of the nuclear power plant and comprises a man-machine interaction system, a discharge machining control system and subsystems. Each subsystem comprises a pulse power supply system, a servo power system, a washing system, a purification system, a grounding system and a tool system; the man-machine interaction system is used for man-machine interaction and displaying the discharge machining implementation data fed back by the subsystems; the electric discharge machining control system is used for generating an electric discharge machining instruction according to the man-machine interaction information and controlling the subsystems to cooperate to perform electric discharge machining work; and each subsystem is used for implementing electric discharge machining work according to the electric discharge machining instruction and feeding back electric discharge machining implementation data. According to the invention, simulation control of discharge processing in the high-radiation boron-containing water environment of the nuclear power plant is realized.

The invention belongs to the technical field of photoconductive switches, and particularly relates to a phonon auxiliary absorption photoconductive switch and a pulse power system. According to the invention, the main excitation path of electrons is changed, that is, the main path of electron excitation in a photoconductive switch (PCSS) is changed into phonon-assisted inter-band transition from impurity energy level-assisted transition, so that bulk excitation with high photon-generated carrier concentration on the PCSS is realized, a large number of photon-generated carriers are relatively uniformly distributed in a conducting channel of the PCSS, and the photoelectric conversion efficiency of the PCSS is improved. And the voltage conversion efficiency of the PCSS can be obviously improved. In addition, the method can be widely and universally used for the PCSS based on the semiconductor material, and the voltage conversion efficiency of the PCSS based on various semiconductor materials is improved.

The invention belongs to the field of electromagnetic emission, and discloses an electromagnetic track emission system and method for friction coefficient full-period measurement. The electromagnetic track launching system comprises an electromagnetic track launching device, a pulse power system, a diagnosis system and a control system. According to the electromagnetic track launching system, full-launching-period measurement of the friction coefficient in an extreme electromagnetic environment can be achieved, and the system is used for monitoring the contact state between central tracks in each launching process and predicting the service life of a device; the full-emission period measurement of the local temperature of the guide rail can be realized; and full emission period measurement of contact pressure and contact resistance between the pivot rails is realized. According to the contact state between the guide rails in the launching process, the pretightening force of the guide rails or the size of the armature is adjusted, so that the service life of the guide rails is prolonged. The local temperature of the guide rail and the contact pressure between the pivot rails are monitored by utilizing the intrinsic physical characteristics of the Bragg grating, the reliability is high, the wavelength self-reference characteristic is realized, the absolute measurement can be realized, the temporal-spatial resolution is high, and the structure is compact.

The present invention discloses a gate-controlled avalanche fast closure IGBT, which comprises, from bottom to top, a collector metal, a substrate, a first epitaxial layer, a second epitaxial layer, a third epitaxial layer, an emitter metal, and a gate metal. The third epitaxial layer comprises a first doped region, a second doped region, and a third doped region. The first doped region originates from the upper surface of the third epitaxial layer and extends downward to the lower surface of the third epitaxial layer. The second doped region originates from the upper left corner of the third epitaxial layer and extends downward to the lower right into the third epitaxial layer, with a certain distance from the first doped region. The third doped region is located within the second doped region and has a certain distance from the left and right sides of the second doped region. The emitter metal is located above a portion of the second doped region and a portion of the third doped region. The gate metal is located above the third epitaxial layer between the second doped region and the first doped region. In a pulsed power system, the avalanche closure IGBT provided by the present invention can significantly shorten the pulse front compared to traditional IGBTs, thereby improving pulse source performance.

The invention provides a control device and method of a pulse power supply system, electronic equipment and a medium. The control device comprises a load coil (1), a loop inductor (2), a switch assembly (3), a follow current assembly (4), a loop resistor (5), a capacitor bank protection assembly (9), a charging protection assembly (10), a charging control switch (11), a direct current charging power supply (12) and a plurality of capacitor banks. A load coil (1), a loop inductor (2), a switch assembly (3), a follow current assembly (4) and a loop resistor (5) are sequentially connected, a plurality of capacitor banks are respectively connected with a capacitor bank protection assembly (9), a charging protection assembly (10) and a charging control switch (11) which are in one-to-one correspondence, and a direct current charging power supply (12) is respectively connected with the load coil (1), the loop resistor (5), the plurality of capacitor banks and the charging control switch (11). Wherein the load coil (1) comprises a positive wave load coil and a negative wave load coil.

A high voltage pulsing power system is disclosed that include a DC power supply, a switch circuit electrically coupled with the DC power supply, a droop control circuit coupled with the switch circuit, and / or an output. The switch circuit includes a plurality of switch modules and produces a plurality of pulses. The droop control circuit includes a droop diode, a droop inductor, and a droop element. The droop diode may be electrically coupled in series between the switch circuit and the transformer primary that allows the negative pulse portion of the pulses to pass from the switching circuit to the transformer primary. The droop inductor and he droop element may be arranged in series across the droop diode to allow the negative pulse portion of the pulses to pass from the switching circuit to the transformer primary and / or store energy from the negative pulse portion of the pulses.

The invention discloses a green synthesis method and application of a doped single crystal material based on a rapid Joule thermal method, and the green synthesis method comprises the following steps: S1, pretreating an initial single crystal to obtain a pretreated initial single crystal, the initial single crystal being selected from a lithium niobate single crystal or a lithium tantalate single crystal; s2, performing all-directional coating on the initial single crystal pretreated in the step S1 by using a metal foil to obtain the initial single crystal coated with the metal foil; and S3, placing the initial single crystal coated with the metal foil obtained in the step S2 on a clamp connected with a pulse power supply system, placing the clamp in a vacuum environment or an oxygen environment, applying current and voltage to the clamp through the pulse power supply system to enable the metal foil to generate Joule heat, keeping the temperature for a certain time, and cooling to prepare the metal-doped single crystal material. According to the technical scheme, the limitation of a traditional synthesis method in the aspects of energy consumption and doping uniformity is broken through, and high-efficiency and low-energy-consumption synthesis of the single crystal material with a controllable doping effect is realized.

A resonant charging supply for a pulsed power supply system for a discharge laser, the configurable resonant charging circuit having one or more of a variable inductor, a programmable energy calculation circuit, a programmable voltage scaling and control circuit, a programmable current scaling and control circuit, and a programmable repetition rate limiter so that the resonant charging circuit is configurable to be able to work with any one of a number of laser platforms having differing operational parameters.

The invention relates to the technical field of plasma nitriding, in particular to laboratory silicon steel plasma nitriding equipment and a control method thereof. Through reasonable arrangement of the vacuumizing system, the gas input system, the nitriding chamber, the pulse power supply system, the control system and matched components, the whole structure is compact, parameter regulation and control are accurate, operation is convenient and fast, fine control over the silicon steel nitriding process can be achieved, complex manual intervention is not needed, and the experiment efficiency can be greatly improved; the electric sliding rail drives the discharge electrode to move so as to adjust the distance between the discharge electrode and a silicon steel sample, multi-parameter cooperative regulation and control in the silicon steel nitriding process can be achieved in combination with a nitriding parameter closed-loop control algorithm and high-precision gas proportion control, and then the uniformity and stability of a nitriding layer are effectively improved; the device can meet the nitriding requirements of silicon steel of different specifications, is suitable for multi-working-condition research of silicon steel surface modification in a laboratory, and is wide in application prospect and easy to popularize.

The application belongs to the technical field of special processing, and discloses a high-radiation underwater non-contact discharge processing method and device. The method sets a processing workpiece and configures a processing electrode system in a high-radiation underwater environment, establishes a discharge channel, carries out etching processing on the processing workpiece, collects physical signals in the etching processing process and generates intermediate data, introduces a water medium suspension containing nanoparticles, dynamically controls the gap of the discharge channel to maintain constant, transmits the intermediate data to a remote monitoring platform through a high-radiation shielding communication link, and the remote monitoring platform evaluates the stability of the discharge channel based on the intermediate data and generates a correction instruction. The device comprises a processing electrode system, a pulse power supply system, an integrated sensing system, a nano-suspension system, a feedback controller and a remote monitoring platform. The application provides real-time monitoring and data support for the processing process and improves the processing quality and efficiency.

The invention belongs to the technical field of non-traditional machining, and discloses a high-radiation underwater non-contact electric discharge machining method and device.According to the method, in a high-radiation underwater environment, a machined workpiece is arranged, a machining electrode system is configured, an electric discharge channel is established, and the machined workpiece is subjected to corrosion removal machining; the method comprises the following steps: collecting a physical signal in an etching processing process, generating middleware data, introducing an aqueous medium suspension containing nanoparticles, dynamically regulating and controlling a gap of a discharge channel to maintain constant, and transmitting the middleware data to a remote monitoring platform through a high-radiation shielding communication link, the remote monitoring platform performs quality evaluation on the stability of the discharge channel based on the middleware data and generates a correction instruction, and the device comprises a processing electrode system, a pulse power supply system, an integrated sensing system, a nano suspension system, a feedback controller and the remote monitoring platform. Real-time monitoring and data support are provided for the machining process, and the machining quality and efficiency are improved.

This invention discloses a modular pulse-magnetized double-sided high-temperature superconducting linear synchronous motor. The motor uses high-temperature superconducting bulk material as the excitation magnet for the mover and utilizes a pulse magnetization device integrated into the magnetization section of the linear motor to achieve in-situ high remanence magnetization of the mover. The system consists of a pulse power supply system, a modular superconducting mover system, and a double-sided stator system. The pulse power supply system uses a large-capacity capacitor bank and, in conjunction with the split magnet coils in the motor's magnetization section, generates a millisecond-level strong pulsed magnetic field to achieve rapid high remanence magnetization of the high-temperature superconducting bulk material. The modular superconducting mover maintains the required low temperature for superconductivity through a Dewar structure, and the number of superconducting mover modules can be increased or decreased as needed to meet different thrust requirements. Simultaneously, the impact of local quenching is limited to a single module, preventing quenching from affecting other movers and improving system reliability. The double-sided stator structure reduces normal electromagnetic force, improves high-speed operation stability, and fully utilizes the double-sided high magnetic field advantage of the high-temperature superconducting mover to enhance the motor's thrust performance. This structure achieves a high degree of integration between the magnetization device and the motor stator, significantly improving the power density, operational stability, and maintenance convenience of the linear motor. It is suitable for applications with high requirements for the thrust performance and reliability of linear motors, such as electromagnetic launch and ultra-high-speed rail transit.

The invention discloses a high-performance pulse energy storage dielectric ceramic material and a preparation method thereof, and belongs to the technical field of electronic materials. The chemical general formula of the material is Sr (0.7-x + 1.5) CdxBi (0.2-y) TiO3, x is more than or equal to 0.05 and less than or equal to 0.2, and y is more than or equal to 0 and less than or equal to 0.1. According to the invention, Cd2O3 is innovatively introduced as an A-site dopant, so that the grain boundary resistivity is remarkably improved, grains are refined, the dielectric strength reaches 285-530 kV / cm, the energy storage density can reach 4.549 J / cm < 3 > under an electric field of 430 kV / cm, and the energy storage efficiency is kept at 88-93%. The material is particularly suitable for manufacturing a pulse capacitor dielectric layer, and can meet the strict requirements of a modern pulse power system on energy storage elements. Compared with a traditional preparation technology, the method has the advantages that technological parameters are easy to control, the production process is environmentally friendly, the production cost is remarkably reduced and the like, and has a good industrial application prospect.

This invention relates to the field of relaxor ferroelectric ceramic dielectric energy storage materials, specifically to a sodium bismuth titanate-based relaxor ferroelectric ceramic and its preparation method, wherein the chemical composition of the sodium bismuth titanate-based relaxor ferroelectric ceramic is (1-x)BNLT. ‑x BAN, of which BNLT is 0.9Bi 0.5 Na 0.5 TiO3-0.1Bi 0.5 Li 0.5 TiO3, BAN is BaAl 0.5 Nb 0.5 The value of O3 and x ranges from 0.06 to 0.18. When x = 0.15, the ceramic exhibits excellent performance with a recoverable energy storage density (Wrec) of not less than 14.0 J / cm³ and an energy storage efficiency (η) of not less than 84% under an electric field of 775 kV / cm. This invention employs a solid-state reaction sintering process, which is simple to prepare and low in cost, making it suitable for high-performance energy storage capacitors in pulsed power systems.

The invention belongs to the technical field of dielectric energy storage ceramic materials, and particularly relates to a lead-free energy storage ceramic material with a core-shell structure as well as a preparation method and application of the lead-free energy storage ceramic material. The core-shell structure exists in the lead-free energy storage ceramic material with the core-shell structure, so that internal stress and local electric field concentration of crystal grains can be relieved, dielectric distribution and polarization response are optimized, and breakdown resistance, energy storage density, energy storage efficiency and charge and discharge characteristics are improved; the lead-free energy storage ceramic material with the core-shell structure has high energy storage density and high energy storage efficiency, the effective energy storage density Wrec reaches up to 11.1 J / cm < 3 > and the energy storage efficiency eta reaches up to 89.1% under a breakdown electric field of 860 kV / cm, meanwhile, the lead-free energy storage ceramic material with the core-shell structure has the rapid charging and discharging characteristic, and the discharging time t0.9 is only 26.6 ns. The lead-free energy storage ceramic material with the core-shell structure provided by the invention has the performance, so that the lead-free energy storage ceramic material has extremely high application value in a pulse power system or an electronic and electric power system.

The invention relates to the technical field of plasma physics and magnetic field compression, in particular to a low-temperature high-density plasma target preparation device and method. According to the technical scheme, the device comprises a pulse magnetization plasma generation assembly, a magnetic field compression transmission cavity, a reversible superconducting cooling type magnet assembly and a multi-window diagnosis observation cavity which are sequentially connected in the plasma transmission direction. Through a two-stage compression mechanism combining eddy current preliminary compression and gradient magnetic field deep compression, on the premise that a complex transient pulse power system is not needed, the plasma density is successfully increased by three orders of magnitude to 1023m <-3 > order of magnitude, and efficient conversion from kinetic energy to internal energy is synchronously achieved; the device adopts a steady-state superconducting magnet and a compact integrated design, the structure is simplified, the operation is stable, the whole-process real-time diagnosis capability is realized, and an efficient and reliable scheme is provided for magnetization target pulse fusion and high-energy density physical research.

The invention relates to the technical field of high-power pulse power supplies, in particular to a high repetition frequency pulse power supply system based on MCT parallel composite current sharing control. According to the technical scheme, the device comprises a direct-current voltage source, a charging relay, an energy storage capacitor bank, an MCT parallel module and a pulse output module which are connected in sequence to form a main power pulse generation and release loop. According to the invention, the resistance-inductance network is connected in series in each MCT parallel branch, so that the transient equilibrium of a current rising edge in a single pulse and the steady-state distribution of a platform period are effectively improved; meanwhile, through FPGA closed-loop control based on current detection, driving time delay of each branch is dynamically adjusted in real time, and conduction moment deviation is corrected pulse by pulse, so that accumulation and aggravation of current unbalance under multi-pulse continuous operation are inhibited; and a software and hardware collaborative composite current sharing mechanism enables the system to stably operate under high repetition frequency working conditions of hundreds of kiloamperes, microseconds and tens of hertz, thereby reducing the overheating risk of the device and improving the overall reliability.

Systems and Methods for providing power to downhole to a pulsed drilling scheme. For example, methods and systems herein may comprise a pulsed power drill bit comprising one or more electrodes, and a pulse-generating (PG) circuit configured to provide an electric potential across the one or more electrodes. In addition. a boost charger configured to charge an energy storage component in the PG circuit and a power supply configured to provide voltage to the PG circuit.

The application relates to the technical field of ceramic material preparation, in particular to a sodium bismuth titanate-based lead-free ceramic material, a preparation method and application. 0.5 Na 0.5 Ti03‑xSr 1 / 2 Nd 1 / 3 (Mg 1 / 3Nb 2 / 3 )O3, Sr 1 / 2 Nd 1 / 3 (Mg 1 / 3 Nb 2 / 3 )O3 is doped and substituted, or Nd 0.5 / (Mg 0.5 Nb 3+ ) 2 / 3 is doped and substituted in (1-x)(0.7Bi 1 / 3 Na 3+ Ti03-0.3SrTiO3), long-range ordered ferroelectricity is destroyed, the relaxation behavior of the ceramic is enhanced, and the dielectric temperature stability of the ceramic material is improved. Under the conditions of high dielectric constant and extremely low dielectric loss, the sodium bismuth titanate-based lead-free ceramic material with wide dielectric temperature region and high frequency stability is obtained, the prepared ceramic material has the characteristics of high breakdown voltage, high energy storage density and excellent dielectric temperature stability, can stably work in a harsh environment such as high temperature and high electric field, and is suitable for application in a high pulse power system. The problems of high dielectric loss, low energy storage density, low energy storage efficiency and narrow working temperature region of the sodium bismuth titanate-based ceramic material in the prior art are solved.

The present invention relates to a monitoring system and method for a pulse power system, and more specifically, to a system and method for monitoring the self-discharge of a gas switch in a FLTD module. The system addresses the technical issues in the prior art where manual observation of the self-discharge of a FLTD module's gas switch results in errors in interpretation, a high workload, and difficulty in determining the specific location of the self-discharging gas switch in the FLTD module during experiments. The system for monitoring the self-discharge of a gas switch in a FLTD module includes an isolation rectifier unit, a counter, a latch, a single-chip microcomputer, an industrial computer, and a capacitive voltage divider. When the monitored gas switch discharges, the capacitive voltage divider generates a pulse signal. The single-chip microcomputer is configured to control the counter to start timing when the monitored gas switch begins charging, and after charging is complete, compares the recorded time sent by the latch with a time threshold, outputting the comparison result.

The invention belongs to the technical field of photoconductive switches, and particularly relates to an ultrahigh-voltage-resistant subnanosecond aluminum nitride (AlN) photoconductive switch (PCSS) and a pulse power system. The photoconductive switch device with the different-surface staggered electrode structure is manufactured on the basis of the high-quality aluminum nitride single crystal. Ultraviolet pulse laser is used as a trigger light source, and a pulse power system is manufactured to test the dynamic response characteristic and the output performance of the aluminum nitride photoconductive switch. The result shows that the device has an ultra-short rise time of less than 0.5 ns, which shows that the device has outstanding potential in the field of wide-spectrum signal generation. The peak value output voltage standard deviation of the aluminum nitride photoconductive switch is relatively low, which indicates that the signal output is high in stability. Besides, the device can work at the maximum bias electric field intensity of 120kV / cm, and the output peak voltage and power are increased along with the increase of the bias electric field intensity and the pulse laser energy, so that the device has huge application potential in a high-power pulse system.

The invention relates to the technical field of ceramics, in particular to an anti-reduction two-phase ferroelectric energy storage ceramic as well as a preparation method and application thereof. The general structural formula of the ceramic is PbaLabZrcTidOe + xwt% Y2O3, wherein a is equal to 0.5 to 1.5, b is equal to 0.01 to 0.1, c is equal to 0.5 to 1.5, d is equal to 0.005 to 0.05, and e is equal to 1.6 to 4.7; 0 lt; xlt; 8. Y2O3 with a specific content is added, so that the stability of a ceramic antiferroelectric phase is improved, the dispersion relaxation of a ceramic material is promoted, the breakdown electric field of the antiferroelectric ceramic is improved, and the reduction resistance of the ceramic is also improved; by matching with a specific tape casting process, the energy storage density of the prepared ceramic is 10-12J / cm < 3 >, and the energy storage efficiency is greater than 80%; the material can be used for an energy storage capacitor and has a good application prospect in a pulse power system.

The invention belongs to the field of wind tunnel tests, and discloses a test device for relieving ablation of a high-enthalpy pulse wind tunnel nozzle throat and a test method thereof. According to the test device, an electromagnetic deceleration channel is arranged on a contraction section of a nozzle body, an electromagnetic acceleration channel is arranged on an expansion section, the electromagnetic deceleration channel and the electromagnetic acceleration channel are respectively connected with a pulse power supply system, and the pulse power supply system is connected with a control system. The test method comprises the steps of setting test parameters; and opening and closing the electromagnetic deceleration channel and the electromagnetic acceleration channel. According to the test device and the test method, high-enthalpy airflow energy generated at the tail end of the low-pressure section of the wind tunnel is extracted through the electromagnetic deceleration channel, the airflow temperature is reduced, nozzle throat ablation is relieved, and the design difficulty of a nozzle throat heat-proof structure is reduced. Kinetic energy is directly added to gas through the electromagnetic acceleration channel, the gas flow speed is increased, and different gas flow Mach numbers are obtained through different electric field and magnetic field control parameters. The test device and the test method thereof are high in test efficiency and convenient to use, and have engineering practical value.

The present invention provides a preparation method and application of a flexible hydroxy-modified BNT-CBZ-OH ceramic particle / polymer composite film, relating to the technical field of flexible energy storage capacitors. The preparation process of the composite film is as follows: First, a sodium bismuth titanate (BNT) seed template is textured; a highly oriented lead-free BNT-CBZ textured ceramic is prepared by using a solid-phase sintering and template grain growth technology; the surface of the ceramic particles is hydroxylated; a P(VDF-TrFE) transparent slurry is prepared and mixed and ball-milled with the hydroxylated ceramic powder; finally, the composite film is prepared by a casting film method. The energy storage capacitor prepared by using the composite film prepared by the present invention has good ductility and high output performance, and can be widely applied to fields such as electronic circuits, energy harvesting, smart grids, and pulsed power systems.

The application provides an isolated pulse power supply system and a control method thereof, comprising a control module, an isolated power supply module, a high-voltage DC power supply module and a high-voltage switch; the isolated power supply module is connected with the high-voltage DC power supply module and an external DC power supply, and is used for isolating the input and output of the power supply system; the high-voltage DC power supply module and the high-voltage switch are both connected with the control module through an optocoupler switch unit; the control module is used for controlling the DC high-voltage source output by the high-voltage DC power supply module and the high-voltage pulse signal output by the high-voltage switch through the optocoupler switch unit. In the application, the control instruction of the control module passes through the optocoupler switch unit, and the DC high-voltage source or the high-voltage pulse signal can be output only when the control instruction reaches the high-voltage DC power supply module or the high-voltage switch; in combination with the isolated power supply module, there is no high-voltage loop in the circuit, and no high-voltage power supply flows through the optocoupler switch unit, so that the selection requirement of the optocoupler switch unit can be reduced, and the cost can be saved.

The invention relates to the technical field of pulse power supplies, in particular to a variable-resistance voltage-regulating low-noise pulse power supply system. Comprising a power supply module, a main control module, a negative voltage generation module, a reference voltage generation module and a pulse generation and boosting module, the power supply module is respectively connected with the main control module, the negative voltage generation module, the reference voltage generation module and the pulse generation and boosting module; the main control module, the negative voltage generation module, the reference voltage generation module and the pulse generation and boosting module are connected in sequence; the main control module is connected with the pulse generation and boosting module; the inductance characteristic of a coil on the primary side of the transformer, namely the characteristic that inductive current cannot suddenly change, is utilized, and a resistor in a circuit is matched to generate pulse high voltage. The pulse power supply system provided by the invention is low in baseline noise, and compared with an existing pulse power supply, the baseline noise is lower, the sensitivity is higher, and unnecessary ionization of helium cannot be caused.

A pulsed power generator includes a first plurality of capacitive stages coupled together. Each capacitive stage of the first plurality of capacitive stages includes a plurality of capacitors, one or more switches for erecting the plurality of capacitors, and a conductive band forming a loop around the plurality of capacitors. The conductive band is to carry a current between the plurality of capacitors and to couple adjacent capacitive stages of the first plurality of capacitive stages. The pulsed power generator includes a pulse shaping circuit at an output of the first plurality of capacitive stages.

The utility model belongs to the field of flywheel energy storage equipment, and particularly relates to an electro-magnetic flywheel energy storage pulse power supply system. Three-phase commercial power is connected with a frequency converter, and the frequency converter is connected with a change-over switch; the change-over switch is further connected with the rectifier bridge and the electro-magnetic flywheel energy storage motor, and the change-over switch achieves communication switching between the electro-magnetic flywheel energy storage motor and the frequency converter and between the electro-magnetic flywheel energy storage motor and the rectifier bridge. The rectifier bridge is also connected with a discharge switch; the discharge switch is also connected with a load; the freewheeling branch is inversely connected with the load in parallel; the feedback loop is communicated with the load and the excitation adjusting module; the excitation adjusting module is further connected with a three-phase mains supply, and the excitation adjusting module adjusts the excitation voltage in the electro-magnetic flywheel energy storage motor. The energy storage and discharge functions are integrated, the energy storage density is high, the service life is long, the pulse energy is large, safety and reliability are achieved, and the pulse response speed is high. In addition, the power supply system adopts feedback topology, the discharge voltage and current are controllable, the flexibility is good, the portability is strong, and the application range is wide.

The invention discloses an organic electron repellent molecule grafted polyetherimide composite film as well as a preparation method and application thereof, and belongs to the technical field of dielectric energy storage materials. The film takes 4-cyanopyrazole as an organic electron repelling molecule, the lowest unoccupied molecular orbital energy level of the film is higher than that of polyetherimide, the film is grafted to a polyetherimide main chain through an amido bond, and the mass ratio of 4-cyanopyrazole to polyetherimide is (5: 9995)-(15: 9985). The preparation is completed through polyetherimide dissolution, grafting reaction, defoaming coating and gradient drying, and the process is simple and convenient. The film effectively solves the problems of insufficient breakdown field strength and high loss of the traditional polyetherimide under high temperature and high field, remarkably improves the insulating property and the charge-discharge efficiency, can be used for high-temperature film capacitors, adaptive high-voltage flexible direct-current transmission converter valves, new energy vehicle motor drivers, pulse power systems and other scenes, and has important engineering application value.

The invention provides a coaxial spark switch for a high-power pulse power system, which consists of three parts, namely a coaxial inner conductor, a coaxial outer conductor and a concave dielectric block, and realizes the function of efficiently transmitting microwave signals by reasonably designing the sizes of a transition section of the coaxial inner conductor and the concave dielectric block. Compared with a commonly used coaxial spark switch structure in which the medium is convex and the radius of the inner conductor is not changed, the inner concave medium block and the coaxial inner conductor transition section are adopted at the air-medium interface as a transition structure, and the impedance mutation of the air-medium interface in the coaxial waveguide is reduced, so that the coaxial spark switch structure is improved. Therefore, the signal reflection of the device is reduced. The device is suitable for a high-power pulse power system, and has the advantages of being easy to process and convenient to install.