17 results about "Pulsed power system" patented technology

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 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.

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.

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.

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.

The invention provides an anti-interference multichannel optoelectronic isolation trigger for a pulse power system, and relates to the technical field of pulse power. The invention provides an anti-interference multi-channel photoelectric isolation trigger for a pulse power system. The anti-interference multi-channel photoelectric isolation trigger comprises a multi-channel electricity-to-light device and a plurality of light-to-electricity devices, wherein the multi-channel electricity-to-light device and the plurality of light-to-electricity devices are placed in two independent cavities; the multi-channel electricity-to-light conversion device comprises an electricity-to-light conversion module. The light-to-electricity device comprises a totally-enclosed light-to-electricity shielding shell, and a light-to-electricity module is arranged in an inner cavity of the light-to-electricity shielding shell; the electricity-to-light module is used for converting an electric signal of external equipment into a light signal, and the light signal is transmitted to the light-to-electricity circuit through an optical fiber; the light-to-electricity circuit is used for converting light signals into electric signals, and the electric signals converted by the light-to-electricity circuit are used for triggering external diagnostic equipment. The device is suitable for photoelectric conversion triggering application in a strong electromagnetic environment, and the characteristics of low jitter and high precision of multiple paths of triggering signals are realized.

The application relates to the technical field of ceramics, in particular to an anti-reduction two-phase anti-ferroelectric energy storage ceramic as well as a preparation method and application thereof. The structure general formula of the ceramic is Pb a La b Zr c Ti d O e +xwt%Y2O3, wherein a=0.5-1.5, b=0.01-0.1, c=0.5-1.5, d=0.005-0.05, e=1.6-4.7; 0<x<8. By adding Y2O3 with a specific content, the stability of the anti-ferroelectric phase of the ceramic is improved, the dispersion relaxation of the ceramic material is promoted, the breakdown electric field of the anti-ferroelectric ceramic is improved, and the anti-reduction performance of the ceramic is also improved; in combination with a specific flow casting process, the prepared ceramic has an energy storage density of 10-12 J / cm 3 , an energy storage efficiency of >80%, and can be used in energy storage capacitors and has a good application prospect in pulse power systems.

The application relates to an electromagnetic emission pulse power module and a pulse power system, and belongs to the technical field of electromagnetic emission, which solves the problem that the existing pulse power module is not conducive to use and maintenance. The electromagnetic emission pulse power module comprises a pulse capacitor, an electrical module and a busbar device, the pulse capacitor is charged to a set voltage through constant current, is used for storing the required electric energy for electromagnetic emission, and can perform rapid pulse discharge on an electromagnetic emission device through the electrical module and the busbar device. The pulse power module is compact in structure, small in occupied space, the power module can be inserted into a cabinet for use, and is suitable for different electromagnetic emission systems.

The invention discloses a solid-state pulse power supply system of a field anti-configuration device and a time sequence control method of the solid-state pulse power supply system. The solid-state pulse power supply system comprises a multiplex load coil, and a bias branch, an ionization branch, an anti-field branch and a steady-state branch which are connected to the two ends of the coil in parallel. A main switch of each branch circuit adopts a solid-state switch element, natural follow current is realized by using a diode or a bidirectional structure in the branch circuit, and an independent follow current branch circuit is thoroughly canceled. Meanwhile, in cooperation with a microsecond time sequence control method, a steady-state branch circuit is conducted in advance to excite the reactor to form virtual impedance, and pure physical series voltage division protection is achieved. According to the invention, full time sequence multiplexing of the coil function is realized, the stray inductance, the size and the cost of the system are reduced, kHz-level repetition frequency operation can be supported, and the reliability and the stability of the field inversion configuration device are obviously improved.

The invention discloses a directional crystallization recovery device and method by coupling a dynamic pulsed electric field with local pH oscillation, and relates to the technical field of environmental engineering. The device comprises an electrochemical reactor, a pulse power supply system and a control system, an anode region and a cathode region which are separated by a microporous diaphragm are arranged in the reactor, the anode is a titanium-based IrO2-Ta2O5 coating electrode, and the cathode is a porous carbon felt loaded calcium silicate composite electrode. According to the method, high-frequency square waves are applied through a pulsed power supply, organic phosphorus is degraded in an anode region, local pH oscillation is induced in a cathode region, calcium silicate is promoted to be dissolved to release Ca < 2 + >, and the Ca < 2 + > and phosphate are directionally crystallized on the surface of a carbon felt to form high-purity hydroxyapatite. The method can realize the phosphorus recovery rate of more than 99%, the product purity of more than 95%, effectively inhibits electrode passivation, adapts to complex wastewater treatment, and has the advantages of high efficiency, energy conservation and high additional value of recovered products.

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.