9 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.

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 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 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 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.

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.