21 results about "Fast pulse" patented technology

The invention discloses a pulse stable output control method and system for an ns-level high repetition frequency fast pulse power supply, and relates to the technical field of automatic control, the system is composed of a plurality of functional modules, and the system comprises a self-adaptive absorption module, a control module and an output control module, and the self-adaptive absorption module obtains power supply parameters through real-time sampling, and the power supply parameters comprise load impedance and switch tube parasitic parameters; dynamically optimizing R and C parameters of the RCD absorption circuit and the active clamping circuit based on power supply parameters; the feed-forward prediction module is used for extracting derivative state information according to the power supply parameters, acquiring load current feed-forward and resonant circuit states based on the derivative state information, modeling based on the load current feed-forward and resonant circuit states, and predicting the drain-source voltage valley bottom moment of the switch tube; and the multi-section variable impedance transmission module adopts a three-section variable impedance structure, performs broadband impedance matching based on R and C parameters of the optimized RCD absorption circuit and the active clamping circuit, inhibits pulse leading edge reflection distortion, and outputs undistorted pulse signals.

The invention discloses a short-stroke fast pulse generating device which comprises a shell, a generator module, a rotating shaft, a magnetic coupling module, a plunger pump, a piston body, a reset spring, a pressure balance rubber sleeve and a piston rod, the generator module, the rotating shaft, the piston body and the piston rod are sequentially arranged in the shell in the length direction of the shell, and the generator module comprises a stator and a rotor; the stator is fixedly arranged in the shell, the rotor is rotationally arranged in the stator, and the stator is arranged at one end of the rotating shaft. According to the technical effects, the magnetic coupling module is adopted, conversion from mechanical energy to electric energy is achieved through external slurry pressure, the self-power-generation requirement is met, the stroke of 4.6-5.6 mm is designed, pulse signals are generated in a short period through rapid reciprocating motion of the piston body, the pulse signals can be rapidly generated, and therefore the transmission rate of the pulse signals is increased; the device can be used in a complex drilling process, realizes high transmission rate through fast pulse, and provides support for fast decoding of ground equipment.

The application discloses a kind of based on navigation star bistatic InSAR's fast data preprocessing method, on the premise of guaranteeing the amplitude and phase accuracy of imaging result, every 1ms echo data is truncated into 50 portions 20us data, and the 20us data corresponding to 1ms reference signal is cross-correlated;50 results obtained by calculation are accumulated again, and the sum obtained is the result of pulse compression;Finally, the final image is obtained using the result of the outcome. The 20us data pulse compression method used changes the size of PRT in the imaging process to speed up the pulse compression speed, which can reduce the difficulty of data processing and the physical cost required for storage under the premise of ensuring the accuracy of imaging results.

The application discloses a microwave photon technology-based radio frequency pulse width measuring device and method, belongs to the microwave photon technology field, and solves the problem that the envelope detector is used to measure radio frequency pulse parameters in the prior art, and it is difficult to realize the measurement requirement of the ultra-wideband radio frequency signal; the application utilizes the advantage of the microwave photon technology ultra-wideband signal processing, processes the ultra-wideband radio frequency pulse signal in the optical domain through two kinds of modulation modes, utilizes the beat frequency output of the photoelectric detector to output two low-frequency edge pulse signals, converts the to-be-measured radio frequency pulse signal in the ultra-wideband frequency range into a low-frequency signal range for collection and measurement, and the ultra-wideband, fast pulse width measurement of the ultra-wideband radio frequency signal can be realized without the collection and processing capacity of the high-speed ultra-wideband radio frequency signal.

This invention relates to a high-speed signal acquisition system, specifically a single-channel wide dynamic range single fast pulse signal acquisition system, solving the technical problem of acquiring a large dynamic range of a single fast pulse P1. The single-channel wide dynamic range single fast pulse signal acquisition system provided by this invention includes a composite pulse train shaping circuit S1, a data acquisition unit S2, and an acquisition and restoration unit S3. The composite pulse train shaping circuit S1 includes a power divider circuit U1, N attenuation circuits U2, N analog delay circuits U3, and a composite circuit U4, where N is an integer greater than 1. The input terminal of the composite pulse train shaping circuit S1 receives a fast pulse P1, first splits the input fast pulse P1, then delays each of the split circuits, and finally combines them into a pulse train P2. Multiple samplings of the single fast pulse P1 signal are achieved within a short time using a single recording channel. Furthermore, by configuring different attenuation parameters for each split circuit, a large dynamic range of the single fast pulse P1 signal can be acquired.

The application relates to a high-voltage pulse electric field ablation device and method, and belongs to the technical field of medical instruments, which solves the problem of long pulse edge and pulse width generated by an existing high-voltage fast switch. The device comprises a high-voltage output module, a capacitor and a control unit. The high-voltage output module comprises a first branch, an additional branch and a second branch which are connected in parallel between a direct-current high-voltage power supply and a grounding end in sequence. The first branch comprises first and second power switches which are connected in series. The second branch comprises fifth and sixth power switches which are connected in series. The additional branch comprises third and fourth power switches which are connected in series. The capacitor is connected between a first node between the first and second power switches and a second node between the third and fourth power switches. The first to sixth power switches are opened and closed to generate a bipolar high-voltage pulse with picosecond or nanosecond rising and falling edges and nanosecond pulse width. The amplitude, rising time, falling time, frequency, pulse width, positive and negative pulse time difference and pulse number of the pulse can be adjusted. The device realizes super-fast pulse rising and falling edges and super-short pulse width.

The disclosure provides a method and system for multiple symbol-frames to encode and decode each symbol-frame code value in contrast to current schemes of encoding and decoding the symbol-frame code based on evaluating single symbol-frames code for each bitstream value. By evaluating multiple symbol-frames and their relationship to each other to encode and decode each symbol-frame code value, the relationship between the pulse width and symbol-frame width can be varied. The description of the exemplary embodiment maintains the same symbol-frame width with a much wider pulse and encoding and decoding multiple symbols-frames to achieve higher data rate telemetry while maintaining the integrity of a signal. The method and associated software to code and decode multiple symbol-frames and their relationship to each other has demonstrated multiples of increased speed that significantly increases the capability of telemetry communication.

This invention discloses a high repetition rate (PRR) fast pulse generation circuit and method based on a pre-triggered front-stage. The pulse generation circuit includes a Marx circuit composed of several stages of charging capacitors. Power switches are provided between each stage of charging capacitors. Each stage of charging capacitor has two sets of isolation resistors and isolation ferrite beads in its circuit. The first stage is an external triggering stage. The power switches are controlled by an external input pulse that is steepened by the triggering circuit. The front-stage circuit is a pre-triggered stage, the intermediate stage is a collector overvoltage conduction stage, and the final stage is a load unit. This pulse generation circuit can effectively reduce the heating phenomenon of the front-stage avalanche transistor and increase the upper limit of the pulse source repetition rate.

This invention relates to a feedback-type high-power electromagnetic pulse (HMP) power supply protection circuit and method, belonging to the field of electromagnetic compatibility (EMC) technology. The circuit includes a feedback sampling unit, a delay unit, and a graded protection unit. The feedback sampling unit samples and compares the pulse voltage amplitude and pulse duration; the delay isolation unit isolates fast pulse signals, maintaining the integrity of the pulse in the sampling circuit and protecting the protection circuit and downstream equipment when the pulse is too long; the graded protection unit provides separate protection for fast-edge narrow pulses and long-duration pulses. The feedback sampling unit includes a voltage amplitude sampling circuit and a pulse duration sampling circuit. The graded protection unit includes a first-stage fast-response branch and a second-stage discharge branch. This invention is applied to high-power electromagnetic pulse protection for DC and AC power ports. From the perspective of graded protection, different protection schemes are selected according to the pulse characteristics to maximize the safety of the power supply system and downstream equipment.

The invention belongs to the technical field of instrument application, and provides a multipath synchronous fast rising edge pulse generation device, which comprises an input trigger pulse conditioning circuit, an FPGA (Field Programmable Gate Array) module, a program control pulse delay circuit, a multipath fast pulse signal generation circuit based on an avalanche triode, a multipath clock fan-out buffer and a time-to-digital conversion circuit, the FPGA is combined with the program control pulse signal delay circuit to generate picosecond-level delay trigger pulses, the avalanche triode-based fast pulse signal generation circuit is triggered to generate fast rising edge pulse signals, high-amplitude pulse signal output is generated, and the driving capability is ensured; moreover, the time difference between the output synchronization pulse and the reference pulse is measured through the time-to-digital conversion circuit, and the trigger pulse delay of each avalanche transistor fast pulse signal generation circuit is adjusted through the FPGA and the program control pulse signal delay circuit, thereby achieving the synchronization adjustment of each pulse. The problem that the synchronism of multiple paths of pulses becomes poor due to changes of factors such as temperature and power supply voltage is effectively solved.

The invention provides a modularized, low-inductance and high-reliability composite pulse power supply assembly, so as to solve the problems of complex system, high cost, limited performance, switching disturbance and the like caused by discrete design of a fast pulse power supply and a quasi-steady-state power supply in an existing theta-pinch device. Through standardized and integrated mechanical and electrical design, hardware unification of two power supply topologies is realized, loop parasitic inductance is reduced, seamless transition from pulse to steady-state current is ensured, and finally the core targets of improving plasma experiment performance, simplifying system architecture and reducing full life cycle cost are achieved.

The invention discloses a neutron spectrum and pulse shape discrimination calculation system and method realized by peak detection. The system comprises a neutron detection module, an analog signal processing module, an analog-to-digital conversion module and a logic and signal processing module. The analog signal processing module carries out parallel processing on the electric pulse signal to obtain slow component integral voltage and original fast pulse waveform voltage. The analog-to-digital conversion module synchronously collects the two paths of signals. The logic and signal processing module is realized based on a programmable logic chip, carries out filtering and baseline recovery on an original waveform, carries out peak detection on an integral voltage to obtain energy, and calculates pulse shape discrimination parameters by extracting time characteristics of the recovered waveform under at least two voltage thresholds. Therefore, real-time discrimination of neutrons and gamma photons is realized. According to the invention, energy spectrum measurement and particle discrimination functions are deeply integrated, the problems of high cost, poor synchronism and complex calculation of a traditional scheme are solved, and high-precision and integrated neutron detection is realized.

The application discloses an AC power meter power frequency magnetic field no-load test method, system and storage medium, which saves the time for the AC power meter to perform the power frequency magnetic field no-load test. The method comprises the following steps: when the AC power meter is placed under a preset power frequency magnetic field condition, a test voltage is applied to the AC power meter, so that the AC power meter normally works; the value in a fast pulse counter is read, and the time required for the value in the fast pulse counter to increase by 1 is determined; the value in a pulse frequency register is read; the fast pulse counter and the pulse frequency register both belong to the components of a metering chip of the AC power meter; according to the time and the value in the pulse frequency register, the time tQ required for the AC power meter to generate one pulse is calculated; and if tQ is greater than a preset time, it is determined that the AC power meter power frequency magnetic field no-load test is qualified.

The invention discloses a carbon dioxide laser output control method for preventing electrical fast pulse train interference, and relates to the technical field of anti-electromagnetic interference control of laser equipment, and the method comprises the following steps: S1, collecting complete waveform data of a redundant coding control signal, constructing a multi-cycle dynamic signal trajectory model, and constructing a multi-cycle dynamic signal trajectory model; extracting disturbance boundary characteristics under electrical fast pulse train interference, and generating a disturbance analysis reference; and S2, setting a multi-level interference judgment threshold value with time resolution capability based on a disturbance analysis reference, identifying repeated self-recovery response caused by interference in combination with the continuity of a signal track, and generating an interference identification mark. According to the invention, by dynamically extracting control signal disturbance characteristics, setting a multi-level judgment threshold and introducing a rhythm control mechanism, logic oscillation caused by interference is effectively identified and inhibited, stable output and efficient recovery of the laser in an interference environment are realized, and the reliability and the immunity of the system are improved.

The present disclosure provides a method of an ultrafast-pulsed laser deposition and a device thereof, wherein a single emitted femtosecond pulse is split, and the split pulses are synchronized in the time domain, and then coupled with each other to form a plasma grating or lattice to excite the target material once; then multiple pulsed lasers are sequentially coupled multiple times with the plasma gratings or lattices to excite the target material multiple times, and the excited target material is deposited and reacted on the substrate to form a thin film.

The application discloses a kind of for microwave source driven modular high-voltage power supply and its millisecond level current-limiting pulse modulation method, belong to power electronics and microwave heating technical field.The power supply includes sequentially connected AC input unit, rectification and boost unit, high-voltage filter unit, current-limiting pulse modulation unit and protection unit.Current-limiting pulse modulation unit includes power semiconductor switch tube, drive circuit and series current-limiting inductance, for chopping modulation to anode current when receiving external pulse control signal, make output power switch between peak power and low power in preset pulse period.Protection unit is used to detect fault and send blocking signal.A plurality of power supply modules can be combined by series-parallel connection to expand power.The application realizes millisecond level fast pulse modulation, has modular expansion capacity and multiple fast protection function, suitable for magnetron, klystron and solid-state microwave source driving.

1. The name of the design product: pulse power supply. 2. The use of the design product: the design product is mainly used to provide stable pulse power supply for BRing fast pulse diode magnet. 3. The design points of the design product: the combination of shape and pattern. 4. The picture or photo that best indicates the design points: perspective view. 5. Other circumstances that need to be explained: the parts A, B of the rear view enlarged view and the parts C, D of the perspective view of the design product are made of glass.

The disclosure provides a method and system for multiple symbol-frames to encode and decode each symbol-frame code value in contrast to current schemes of encoding and decoding the symbol-frame code based on evaluating single symbol-frames code for each bitstream value. By evaluating multiple symbol-frames and their relationship to each other to encode and decode each symbol-frame code value, the relationship between the pulse width and symbol-frame width can be varied. The description of the exemplary embodiment maintains the same symbol-frame width with a much wider pulse and encoding and decoding multiple symbols-frames to achieve higher data rate telemetry while maintaining the integrity of a signal. The method and associated software to code and decode multiple symbol-frames and their relationship to each other has demonstrated multiples of increased speed that significantly increases the capability of telemetry communication.

The application provides a kind of five-phase motor fast pulse width modulation method based on multi-vector model prediction current control, to solve the problem that higher control accuracy and lower algorithm complexity cannot be achieved simultaneously in the existing five-phase permanent magnet synchronous motor model prediction current control strategy.The method comprises: establishing motor model and model prediction value evaluation function;combining current error and coordinate transformation theory, updating the expression of value evaluation function;the value evaluation function is subjected to partial differentiation with respect to duty cycle to obtain the minimum value, and the virtual duty cycle is obtained;the virtual duty cycle is reconstructed, and then acts on the inverter to drive the five-phase motor to run.The application adopts model prediction current control theory, combines fast pulse width modulation strategy, can actively and in advance calculate the optimal control duty cycle, so as to obtain faster dynamic response and lower overshoot than traditional model prediction control strategy.

The application discloses a pulse stable output control method and system of an ns-level high-repetition-frequency fast pulse power supply, and relates to the technical field of automatic control. The system is composed of a plurality of function modules, and comprises: an adaptive absorption module which acquires power supply parameters, including load impedance and switch tube parasitic parameters, through real-time sampling, and dynamically optimizes R, C parameters of an RCD absorption circuit and an active clamp circuit based on the power supply parameters; a feedforward prediction module which extracts derived state information according to the power supply parameters, acquires load current feedforward and resonant loop state based on the derived state information, models based on the load current feedforward and the resonant loop state, and predicts a switch tube drain-source voltage valley time; and a multi-section variable impedance transmission module which adopts a three-section variable impedance structure, performs wide-band impedance matching based on the optimized R, C parameters of the RCD absorption circuit and the active clamp circuit, suppresses pulse front edge reflection distortion, and outputs a distortion-free pulse signal.

An ultrafast random laser fast pulse width measuring instrument comprises a beam splitter, a wedge-shaped mirror, a high reflective mirror, a first cylindrical lens, a second cylindrical lens, a first convex lens, a frequency doubling crystal, a second convex lens, a time delay optical fiber array, a photoelectric detector and an oscilloscope. After a to-be-measured light beam is split, one path of light is inclined through a wedge-shaped mirror, then interferes with the other path of light and then is subjected to frequency multiplication, time domain waveforms are converted into spatial intensity distribution, time domain broadening of pulses is achieved through a space division delay optical fiber array, sampling is conducted through a conventional oscilloscope, and therefore rapid measurement of the waveforms and the widths of the ultrafast pulses is achieved. Time switching is realized by adopting a pulse tilt interference method, pulse time broadening is realized through optical fiber array space division delay, high-precision rapid measurement of ultrashort pulses can be obtained by using a common oscilloscope, an unrepeatable optical dynamic process can be rapidly represented, and the method has the advantage of low cost and is suitable for large-scale popularization and application. The method is a novel ultrafast laser pulse measuring technology with high cost performance.