75 results about "Pulse forming network" patented technology

Capacitor based pulse forming networks and related methods are provided which require fewer inductors are that pulsed more frequently to provide a smaller, lower mass, and lower inductance pulse forming network having better pulse shaping characteristics than conventional pulse forming networks. In one implementation, the invention can be characterized as a capacitor based pulse forming network comprising a plurality of inductors adapted to be coupled to a load, a plurality of capacitor units, and a plurality of switches. Each switch couples a respective capacitor unit to a respective inductor, wherein multiple capacitor units are coupled to each inductor by separate switches. The plurality of switches are adapted to non-simultaneously discharge the multiple capacitor units to provide non-simultaneous pulses through a given inductor to the load and not through other inductors. The non-simultaneous pulses form at least a portion of an output pulse waveform to the load.

Capacitor based pulse forming networks and methods are provided which require fewer inductors are that pulsed more frequently to provide a smaller, lower mass, and lower inductance pulse forming network having better pulse shaping characteristics than conventional pulse forming networks. In one implementation, the invention can be characterized as a capacitor based pulse forming network comprising a plurality of inductors adapted to be coupled to a load, a plurality of capacitor units, and a plurality of switches. Each switch couples a respective capacitor unit to a respective inductor, wherein multiple capacitor units are coupled to each inductor by separate switches. The plurality of switches are adapted to non-simultaneously discharge at least some of the multiple capacitor units to provide non-simultaneous pulses through a given inductor to the load and not through other inductors. The non-simultaneous pulses form at least a portion of an output pulse waveform to the load.

Circuitry is provided to drive a step recovery diode (SRD) (8) in a sampler based vector network analyzer (VNA) that allows harmonic samplers (10, 11) to operate over many octaves. The circuit includes a digital pulse generator (FIG. 5) for providing a LO signal. The LO signal is provided over an octave frequency range as in previous SRD driver circuits, but pulse forming circuitry is provided to decrease the pulse rate to a sub multiple of the LO generating oscillator signal. The pulse forming circuitry includes a programmable frequency divider (50) to vary the pulse rate. The pulse forming network further includes registers (50, 52) connected to the programmable frequency divider (50) to limit the pulse width resulting in reduced heating of the SRDs. With an effectively wider frequency operation range using the SRD (8), only one downconversion is required in the VNA, eliminating the need for additional mixers (30, 31) and a second LO signal generator (24) to provide a second downconversion.

A fault-tolerant control system facilitates the closed loop control of a magnetron. The control system includes a transformer assembly for applying peak current to a magnetron, a pulse-forming network that conditions a transmit pulse, and a control circuit for adjusting the peak current applied to the magnetron. The control circuit includes a sample and hold circuit for comparing a signal representative of a detected peak current to a desired peak current level. The sample and hold circuit is coupled to a digital up / down counter circuit, and the output of the counter circuit is utilized to adjust the charge voltage of the pulse-forming network.

A magnetic field generator includes a power source and a coil connected to the power source to generate a time-varying magnetic field. Energy is applied to the coil so that the coil generates a time-varying magnetic field gradient with a magnitude of at least 1 milliTesla per meter and a rise-time of less than 10 microseconds. One or more of a capacitor, a multi-stage high-voltage switch, and / or a pulse-forming network may assist with the generation of the magnetic field gradient.

The invention discloses a pulse forming network based on a double-capacitor structure and belongs to the technical field of pulse power. The pulse forming network is mainly used for generating high-voltage pulse square waves. A base circuit of the pulse forming network comprises a capacitor C1 and a capacitor C2, a self-inductor LC1 and a self-inductor LC2 of the capacitor C1 and the capacitor C2 and four wired inductors L11, L12, L21 and L22, wherein the capacitance of two capacitors is non-uniform; and a capacitance value of the capacitor C2 is greater than that of the capacitor C1. By adopting high-voltage pulse capacitors as energy storage units, the pulse forming network disclosed by the invention has the advantages of high energy-storing density; and by adopting a double-capacitor pulse forming system, the series of the pulse forming network is reduced, the defect that pulse square waves cannot be formed by a single-capacitor system is overcome and fast leading edge and quasi-pulse square wave output can be realized. The pulse forming network has the advantages of compact structure, small size, high voltage resistance, great energy-storing density and high reliability. The pulse forming system can be applied to pulse power systems with hundred-nanosecond grades.

A pulse forming network is disclosed. The device comprising two pulse forming networks (40), a first pulse forming network comprising n sections, n being an integer, and a second pulse forming network comprising m sections, m being an integer, each of the sections of the first and the second pulse forming networks comprising at least one capacitor and at least one inductor, and each pulse forming network having one output port for connecting a load, the two pulse forming networks electrically connected and magnetically coupled back to back. A method and device for extinguishing an electrical pulse generated by a pulse generator is also disclosed (SWo).

A spark gap switch for controlling the output of a high voltage pulse from a high voltage source, for example, a capacitor bank or a pulse forming network, to an external load such as a high gradient electron gun, laser, pulsed power accelerator or wide band radar. The combination of a UV laser and a high vacuum quartz cell, in which a photocathode and an anode are installed, is utilized as triggering devices to switch the spark gap from a non-conducting state to a conducting state with low delay and low jitter.

The invention relates to a pulsed plasma thruster based on electrothermal-electromagnetic hybrid accelerating. The pulsed plasma thruster based on electrothermal-electromagnetic hybrid accelerating comprises a power processing unit, a micro pulse forming network, a trigger, a trigger circuit, a main discharge circuit, a capillary discharge cavity, a cathode nozzle, an anode base, a rodlike anode and a backflow shell. Owing to the ingenious structural design, the pulsed plasma thruster can achieve electrothermal and electromagnetic accelerating effects simultaneously, and can play a good accelerating effect on neutral elements and charged elements produced by ablation. In a small energy state, the problem of low thruster efficiency can be improved significantly, and the pulsed plasma thruster is suitable for low power micro satellite applications.

The invention discloses a combined pulse formation network and a method. The combined pulse formation network mainly comprises a pulse formation line, an energy-storage capacitor, a switch and a pulse transmission line, wherein the connecting relationship thereof is as follows: the output end of the pulse formation line is respectively connected with the high voltage end of the energy-storage capacitor and the anode of the switch; the low voltage of the energy-storage capacitor is grounded; and the cathode of the switch is connected with the input end of the pulse transmission line. The combined pulse formation network can be matched with a variable resistance load, supplies a short pulse high voltage for the load impendence to puncture when the load impedance is high, and supplies a subsequent long pulse for finishing the specific physical machining or chemical reaction on the load when the impedance becomes low. Compared with the conventional high voltage pulse power supply used in the variable impedance load, the combined pulse formation network greatly increases the utilization rate of energy and prolongs the service life of the power supply.

Circuitry is provided to drive a step recovery diode (SRD) (8) in a sampler based vector network analyzer (VNA) that allows harmonic samplers (10, 11) to operate over many octaves. The circuit includes a digital pulse generator (FIG. 5) for providing a LO signal. The LO signal is provided over an octave frequency range as in previous SRD driver circuits, but pulse forming circuitry is provided to decrease the pulse rate to a sub multiple of the LO generating oscillator signal. The pulse forming circuitry includes a programmable frequency divider (50) to vary the pulse rate. The pulse forming network further includes registers (50, 52) connected to the programmable frequency divider (50) to limit the pulse width resulting in reduced heating of the SRDs. With an effectively wider frequency operation range using the SRD (8), only one downconversion is required in the VNA, eliminating the need for additional mixers (30, 31) and a second LO signal generator (24) to provide a second downconversion.

An inductive pulse forming network stores electrical energy delivered from an outside prime power supply in the electric field of a low-voltage, high-energy density network capacitor. Through timed actuation of a series of one or more switches, the energy stored in the electric field of the network capacitor is subsequently converted to electrical energy stored in the magnetic field of a network inductor. The energy stored in the network inductor supplies high-current, high-power electrical energy to drive an electromagnetic launcher such as a railgun.

A high-frequency VNA system is provided using non-linear transmission line (NLTL or shockline) based samplers configured to provide scalable operation characteristics. Scaling to adjust noise performance vs. frequency is accomplished as follows: (1) increasing or decreasing the fall time of a shockline's output voltage waveform. This is accomplished by changing the number of Schottky varactors in a shockline, as well as changing the shockline's Bragg cutoff frequency by setting the spacing between Schottky varactors; (2) changing the structure of the pulse-forming network connected with the sampler by changing the length of the differentiator arms in the sampler pulse-forming network; and (3) changing the LO signal frequency applied to the shockline. Multiple NLTL based samplers are multiplexed to form a broadband reflectometer with the multiplexing circuitry selectively connecting one of the NLTL based sampler segments at a time to allow user selection of a desired performance vs. frequency response for each segment.

The invention relates to a pulse width switching circuit structure, comprising a Blumlein pulse forming network (PFN), wherein the Blumlein PFN is provided with a second high-voltage relay K2 which is used for dividing the Blumlein PFN into a first PFN and a second PFN; the first PFN and the second PFN are distributed uniformly and symmetrically; the first PFN is internally provided with at leastone first high-voltage relay K1; the second PFN is internally provided with at least one third high-voltage relay K3; the third high-voltage relay K3 is arranged corresponding to the first high-voltage relay K1, thus a pulse network structure which is divided by the third high-voltage relay K3 in the second PFN corresponds to a pulse network structure which is divided by a first relay in the first PFN; and coils of the first high-voltage relay K1, the second high-voltage relay K2 and the third high-voltage relay K3 are connected with a relay drive circuit. The pulse width switching circuit structure is convenient to install and use and wide in applicable scope, reduces the reformation cost of digital weather radars, and is safe and reliable.

The invention discloses a high-voltage pulse deburring device which is composed of a pulse ignition and DC detection power supply, a low-voltage pulse enabling power supply and an adjustment, control and protection display system. The pulse ignition and DC detection power supply comprises a high-voltage small-energy pulse ignition circuit. The low-voltage output end of the pulse ignition and DC detection power supply is electrically connected with one end of a vacuum pipe. A pulse ignition terminal or a DC detection terminal of the pulse ignition and DC detection power supply is electrically connected with the other end of the vacuum pipe. The low-voltage pulse enabling power supply comprises a low-voltage pulse charging power supply and a pulse forming network. The adjustment, control and protection display system is electrically connected with the pulse ignition and DC detection power supply and the low-voltage pulse charging power supply through wires. By means of the high-voltage pulse deburring device, burrs in a device are found through small-energy high-voltage pulses, ignition points are formed, then preset low-voltage large-current pulses are automatically output to fuse the burrs, and the aim of removing burrs in a low-energy-consumption and high-efficiency mode is effectively achieved.

The invention discloses a novel pulse formation network, belongs to the technical field of pulse power, and is mainly used for generating a high-voltage pulse square wave. The novel pulse formation network is formed by sequentially connecting three stages of pulse capacitors in parallel, wherein an inductor is respectively connected between first output electrodes of each stage of pulse capacitor and the subsequent stage of pulse capacitor and between second output electrodes of each stage of pulse capacitor and the subsequent stage of pulse capacitor. According to the novel pulse formation network, a high-voltage pulse capacitor serves as an energy storage unit which has the advantage of high stored energy density; by the adoption of the non-uniform pulse formation network of a three-capacitor structure, the number of stages of the pulse formation network is decreased, pulse waveform regulation is facilitated, and fast-front quasi-pulse square wave output can be realized. The novel pulse formation network is compact in structure, small in size, high in voltage resistance, high in stored energy density and high in reliability, and can be applied to a hundred-nanosecond pulse power system.

The invention belongs to the field of the power electronics, and specifically a pulse forming network based on a cathode short-circuit grid-controlled thyristor (CS-MCT). The pulse forming network mainly comprises a charging loop composed of a DC power supply and a charging resistor, N-step pulse forming network part, a discharging loop composed of a one-way conducting diode, a CS-MCT, a freewheeldiode, a two-way clamping diode and a load, and a device grid control part, wherein the CS-MCT adopts the four-end connection, and a grid cathode (kevin cathode) is added in comparison with the normal three-end device. The pulse forming network disclosed by the invention has the advantages that the influence on the grid cathode loop by instantaneous high voltage induced by a cathode inductor canbe effectively inhibited, and the breakdown invalid of the grid caused by the overvoltage is avoided; the grid only has the effect of triggering the conduction, when a device enters a thyristor work mode after the latch is conducted, the electric-conducting modulation effect is further reinforced, the conductivity is free from the control of the grid and the limitation of the saturation current, and the greater pulse current can be realized under small area.

A magnetic field generator includes a power source and a coil connected to the power source to generate a time-varying magnetic field. Energy is applied to the coil so that the coil generates a time- varying magnetic field gradient with a magnitude of at least 1 milliTesla per meter and a rise-time of less than 10 microseconds. One or more of a capacitor, a multi-stage high-voltage switch, and / or a pulse-forming network may assist with the generation of the magnetic field gradient.

The invention relates to a generator for generating exponential rise pulse current. The generator for generating exponential rise pulse current is characterized in that a first high voltage charging power supply is connected with a first pulse to form a network and the first pulse forming network controls a first gas switch through a silicon stack, a second high voltage charging power supply is connected with a second pulse to form a network and the second pulse forming network controls a second gas switch, the first gas switch and the second gas switch control an electro-explosive wire opening switch and a gas sharpening switch, the gas sharpening switch controls the load and a high-voltage dividing test meter, and a delay controller controls the first gas switch through a first trigger pulse and controls the second gas switch through a second trigger pulse. According to the generator for generating exponential rise pulse current, current outputted by the analog pulse magnetic flux compression generator in ordinary laboratory can be achieved. The generator for generating exponential rise pulse current has the advantages of low use cost, reusability, versatility, easy usage and security.

The invention discloses a Blumlein-type pulse forming system with thin-film capacitors triggered by square waves. The pulse forming system comprises a Blumlein-type pulse forming network, a square wave trigger, a main switch and a load, wherein the main switch is used for connecting the Blumlein-type pulse forming network with the square wave trigger; the load is connected to the output terminal of the Blumlein-type pulse forming network; the thin-film capacitor with the capacitance value of 0.8 to 2nF is adopted in each stage in the Blumlein-type pulse forming network; the output terminal of each thin-film capacitor is output fixedly by connecting a wide electrode with three screws; and the square wave trigger comprises an energy-stored pulse forming line, a voltage equalizing circuit and a low shaking switch. By utilizing the thin-film capacitors with the low capacitance values, the pulse forming system has the advantages of being good in impact resistance, excellent in electrical performance, wide in working temperature range, very small in influence on self-performance caused by the environment, long in service life and the like.

A modulator is provided that comprises a nonlinear transmission line (NLTL) that is bias modulated by a baseband signal. A given logic state of the baseband signal determines a delay amount of a first carrier signal through the NLTL. The modulator further comprises an impulse forming network (IFN) that includes a first NLTL that receives the first carrier signal delayed by the determined delay amount and a second NLTL that receives a second carrier signal having a fixed delay amount. The first NLTL and second NLTL within the IFN have opposite diode polarity configurations. The modulator further comprises a power combiner that converts a delta delay of the first carrier signal relative to the second carrier signal to a sharp impulse that represents the given logic state of the baseband signal.

A method for generating high power pulsed RF waveforms comprises the steps of charging a transmission line in a pulse forming network with a high-voltage and discharging the voltage on the transmission line to ground utilizing a gallium nitride photoconductive switch.

The invention discloses a high-voltage pulse generator based on a pulse forming network and a varistor, and aims to solve the problems that the flatness of a pulse later-period waveform generated by an existing high-voltage pulse generator is lowered, and the energy waste is serious and the like. The high-voltage pulse generator is composed of a Marx generator, an MOV (Metal-Oxide Varistor) component, an inductor L1, a load Z, a discharge switch S1, and an LC filter branch; the LC filter branch is formed by connecting an inductor L2 and a capacitor C2 in parallel; the Marx generator, the L1 and the LC filter branch form two sections of pulses to form a network; the LC filter branch is connected between the Marx generator and the L1 in series; the L1 is connected between the LC filter branch and the MOV component in series; the S1 is connected between the Marx generator and the LC filter branch; and the Z, the MOV component and the Marx generator are connected in parallel. According tothe high-voltage pulse generator based on the pulse forming network and the varistor provided by the invention, a pulse forming line is not needed, a high-voltage pulse square wave with stable waveform flatness can be generated, and the energy utilization efficiency can be effectively improved.