385 results about "Current pulse" patented technology

The invention discloses a high-voltage cable operation state on-line monitoring, intelligent early warning and fault positioning system, particularly relates to the technical field of power equipment insulation monitoring, and is used for solving the problems that transient discharge signals generated in the cable insulation degradation process are difficult to effectively capture and accurate fault positioning cannot be realized in the prior art. The method comprises the following steps: collecting transient leakage current signals and traveling wave propagation characteristic parameters, performing phase correlation analysis on leakage current pulses and power frequency voltage to identify discharge types, and performing variational mode decomposition and Hilbert-Huang transform on the signals to respectively extract complexity characteristics and energy distribution characteristics; signal logic conflicts are judged by analyzing similarity and statistical distance among characteristics of a plurality of monitoring points, and collaborative diagnosis is started or traveling wave distance measurement is directly utilized to carry out insulation state evaluation and fault location. And finally, differential early warning levels are generated according to the diagnosis result, and fault line selection and positioning information is output to realize real-time monitoring, intelligent early warning and accurate positioning of the operation state of the high-voltage cable.

The invention discloses an oil-immersed transformer active defense method and system based on pulse current characteristics. The acquisition device is used for acquiring output signals of high-frequency pulse current sensors mounted at a high-voltage bushing end screen grounding position, a high-voltage bushing position and an iron core grounding position to obtain digital pulse current signals; whether active defense is started or not is judged according to whether the instantaneous value of the pulse current signal at the iron core grounding position reaches a protection starting threshold or not; judging whether the current pulse cluster is a discharge pulse cluster with abnormal internal discharge or not based on the three groups of pulse current signal characteristics; and judging whether protection acts or not according to the number of abnormal discharge pulse clusters in a set period. According to the method, serious partial discharge in the large oil-immersed transformer can be identified, protection measures are actively taken, and the situation that serious discharge defects are further developed into arc breakdown faults is effectively avoided.

The invention discloses a direct current B code wave recording alarm analysis device and method based on an FPGA, and relates to the technical field of power system automation and signal analysis, and the device comprises an FPGA collection module which is used for collecting a TTL level signal of a direct current B code in real time at a preset sampling frequency, recording a high-precision timestamp of each sampling point, and carrying out the subsequent pulse parameter calculation; the pulse width measurement module is connected with the FPGA acquisition module, is used for calculating the pulse width of the current pulse based on the rising edge timestamp and the falling edge timestamp of the signal, triggering a wave recording module, and is used for starting wave recording operation when the pulse width is detected to exceed a preset threshold range or abnormity occurs for a plurality of times continuously; collecting complete waveform data before and after the fault; the DC B code wave recording alarm analysis device and method based on the FPGA improve the intelligent level, response speed and fault visualization capability of a B code monitoring system, and are especially suitable for high-reliability monitoring and management scenes of key synchronization signals in a DC system.

The invention relates to the technical field of capacitor charging and discharging control, in particular to a super-capacitor charging and discharging control method and system, and the method comprises the steps: transmitting a preset low-current pulse test signal to a super-capacitor, and recognizing the characteristics of the capacitor; according to the capacitance characteristics, selecting a target charging path from the preset charging paths for staged charging; a charging stage verification model is set for charging stage verification, and whether a charging stage switching condition is met or not is judged by combining real-time monitoring of the internal resistance change rate and the voltage climb rate; a parallel state monitor is designed, and the optimal control parameters of the next charging stage are calculated in parallel based on the target charging path while the control of the current charging stage is executed; when the charging stage switching condition is met, the optimal control parameters are loaded immediately for charging stage switching; monitoring the state of the capacitor in the charging process in real time, and returning to the previous stable charging stage and re-identifying the characteristics of the capacitor when an abnormal state is detected; and when the retry times exceed a preset upper limit, switching to a safety protection mode.

The invention discloses an energy-saving control method for a new-energy high-low-voltage direct-current relay. The energy-saving control method comprises the steps of analyzing a mapping relation between a silicon steel sheet stacking angle and a magnetic flux path deviation, calculating magnetic domain wall moving resistance according to magnetic domain boundary stress, determining a magnetic domain overturning speed by combining a magnetic field change rate, and measuring a hysteresis loop width parameter. Adjusting the width and frequency of the excitation current pulse according to the magnetic domain overturning frequency and the hysteresis loop offset and width to obtain an optimized excitation current pulse sequence, and determining the hysteresis loop expansion speed according to the hysteresis loop area change rate; the local high-temperature area temperature is analyzed through the iron core temperature rise rate, the local high-temperature area distribution and the magnetic domain energy dissipation data, if the local high-temperature area temperature exceeds the preset threshold value, the excitation current pulse is adjusted, stable iron core temperature rise control data is obtained, the coercive force change amplitude is determined, the magnetic hysteresis loss and the temperature rise are reduced, the stability of the relay under high-frequency switching is improved, and the reliability of the relay is improved. And the operation efficiency and reliability of the system are greatly improved.

The invention provides a voltage difference monitoring device and method for a bootstrap switching power supply and the switching power supply. The device comprises a voltage difference detection module which is configured to detect the voltage difference between the two ends of a bootstrap capacitor and generate a lower tube conduction indication signal if the voltage difference does not reach a set threshold value; the lower tube forced conduction module is configured to generate a plurality of continuous pulse signals according to the lower tube conduction indication signal so as to conduct a lower transistor when the pulse signals are in high level, so that the bootstrap capacitor is charged through the first power supply voltage until the voltage difference reaches a set threshold value; and the negative current detection module is configured to send a forced turn-off signal to the lower transistor forced turn-on module and end the turn-on period, corresponding to the current pulse signal, of the lower transistor if a negative current greater than a threshold value is detected during the period of turning on the lower transistor through the pulse signal. According to the invention, high differential pressure detection precision is realized through a simple circuit structure.

The invention relates to the technical field of discharge monitoring, and provides a high-precision monitoring method and system for partial discharge current pulse signals. The method comprises the following steps: activating distributed broadband monitoring equipment to continuously monitor a transformer to obtain distributed monitoring information; extracting first monitoring information, and performing feature collection on the first pulse signal to obtain a pulse feature set; establishing a multi-conductor transmission line model based on the multi-dimensional characteristic parameters of the transformer, and performing simulation to obtain simulation information; and calling a partial discharge positioning strategy to analyze the pulse feature set and the simulation information, and determining the partial discharge source of the transformer. According to the invention, the technical problems that the partial discharge pulse signal in the transformer cannot be accurately extracted and analyzed and the accurate positioning of the partial discharge source is influenced because the detection blind area is easily influenced by electromagnetic interference and the weak signal identification is insufficient in the existing partial discharge monitoring method are solved; the technical effect of high-precision partial discharge source positioning is achieved.

The invention relates to a method for determining the temperature of a transistor, a transistor driver device and a system. A method of determining a temperature of a transistor (11) is provided. The method comprises providing a current pulse having a predefined length and a predefined current magnitude to a control terminal (15) of the transistor (11) and measuring a voltage at the control terminal (15). The temperature of the transistor (11) is determined on the basis of the measured voltage.

The invention discloses a cable joint discharge monitoring system, which comprises a sensing layer, a data fusion layer and an analysis layer, and also discloses a cable joint discharge monitoring method, which comprises the following steps: monitoring the high-frequency current of a cable joint, acquiring a back Raman scattering signal of laser in a distributed optical fiber by an optical time domain reflection demodulation unit, obtaining the temperature of a measuring point, and monitoring the temperature of the cable joint. The analysis layer judges whether the temperature exceeds a temperature warning value or not, judges whether a high-frequency current pulse from the high-frequency current sensor is greater than a high-frequency current pulse warning value or not when the temperature exceeds the temperature warning value, and establishes a three-dimensional temperature field according to the temperature of the measuring point when the high-frequency current pulse is greater than the high-frequency current pulse warning value; the method comprises the following steps: acquiring a three-dimensional temperature field, performing spatio-temporal data alignment on the three-dimensional temperature field and high-frequency current acquired by a high-frequency current sensor, generating an abnormal region thermodynamic diagram, judging whether time and temperature data after alignment have interference or not, and performing three-dimensional positioning on a defective region and evaluating the severity of the defective region by an analysis layer when the interference does not exist.

The invention discloses a grounding resistance regular monitoring system and method, and belongs to the technical field of power equipment state monitoring. The system comprises a pulse generation module, a measurement module, a control module, a protection module and a communication module. The core lies in that a low-amplitude short-time-range direct-current pulse current is adopted to be injected into a grounding system, the pulse amplitude, width and frequency parameters are optimized to be always lower than the action threshold value of a relay protection device, and therefore accurate measurement is achieved on the premise that power is not cut off and misoperation is not caused. Meanwhile, historical data trend analysis and soil environment factors are fused, the deterioration trend of the grounding resistance is intelligently predicted, early warning is performed in advance, and a resistance reduction device can be linked for automatic adjustment. The method effectively solves the problems that a traditional measurement method needs power failure and is poor in interference resistance and an existing online monitoring technology is likely to trigger protection by mistake, and achieves safe, accurate, automatic and intelligent monitoring, operation and maintenance of the grounding resistance.

The invention relates to the technical field of electrical equipment state monitoring, and discloses an electrical equipment partial discharge positioning detection method. The method comprises the following steps: acquiring synchronous current pulse sequences and ultrasonic waveforms through a pulse current sensor and an ultrasonic sensor; calculating a signal delay inequality; establishing a sound wave propagation multi-path database based on the three-dimensional structure of the switch cabinet and the sensor coordinates; matching the ultrasonic shape features with a database to determine an actual propagation path and an equivalent distance; combining the delay inequality, the sensor coordinate and the equivalent distance, and iteratively solving the optimal space coordinate of the discharge point by adopting a particle swarm optimization algorithm; and mapping the coordinates to the topological graph to generate a positioning report. According to the method, the sound wave aliasing effect is decoupled through the pre-established multi-path database, the time delay correction and coordinate solving process is optimized, and the positioning precision and efficiency are remarkably improved.

The invention relates to the technical field of lamp bead active heat dissipation, and discloses an LED lamp bead active heat dissipation system and method, and the method comprises the steps: injecting a micro-current pulse into a PN junction of an LED chip through a constant current source, collecting a forward voltage drop sampling value, and collecting a substrate temperature sampling value; calculating a junction temperature value based on the forward voltage drop sampling value, and calculating a junction-to-case temperature difference value and a substrate temperature rise rate value; setting an early-warning state identifier when the junction-to-case temperature difference value exceeds an early-warning threshold value and the duration meets a preset duration, setting an alarm state identifier when the junction-to-case temperature difference value exceeds an alarm threshold value, and shielding thermal runaway detection when the substrate temperature rise rate value exceeds an environment thermal shock threshold value and the junction-to-case temperature difference value is smaller than an environment exclusion threshold value; when the state identification is the normal state identification, calculating a first compensation current value; and when the state identification is the early warning state identification, a second compensation current value is calculated, and when the state identification is the alarm state identification, an alarm current limiting value is calculated, so that the working stability and long-term reliability of the LED in a wide temperature range are ensured.

The invention discloses a closed-loop vagus nerve stimulation system capable of cooperating with rehabilitation exercise. The closed-loop controller is used for collecting an external signal related to animal movement as a gating signal, processing the signal and generating a control instruction; the vagus nerve stimulator is used for receiving the control instruction of the closed-loop controller, adjusting stimulation parameters and outputting vagus nerve stimulation pulses; the wireless communication module is used for realizing wireless connection between the closed-loop controller and the vagus nerve stimulator and ensuring rapid transmission of a control instruction; the motion signal acquisition device is used for acquiring external signals related to animal motion; according to the invention, the problem of output misalignment of existing small equipment under a high load is obviously improved through a four-stage cascaded constant-current pulse generation architecture; meanwhile, based on a naked pulse infrared direct drive protocol and an MCU highly integrated processing chain, the timing sequence matching precision requirement of vagus nerve stimulation pulses and rat rehabilitation exercise actions is ensured.

Device and method for measuring a junction temperature of a power semiconductor (3) using the resistance Rgint (32) of said semiconductor (3) comprising at least: a current injector circuit (5) injecting current pulses Iinj in the gate path of said power semiconductor (3) through the emitter of said power semiconductor, said current injector circuit (5) being driven by a digital injection control circuit (4, 6) to synchronize said current pulses within a stabilized part of ON states of the power semiconductor driver (1) PWM signal driving said power semiconductor (3), a peak detector circuit (7) to record emitter voltage peaks Ve at the terminals of the current injector circuit and generate a continuous signal Vpks dependent of the junction temperature Tj through integration of said voltage peaks, a signal conditioning circuit (8) to adapt the continuous signal Vpks dependent of the junction temperature into a range of 3V to 5V of a measurement system (9).

The invention relates to the technical field of vehicles, in particular to a vehicle battery heating method and device, a vehicle and a storage medium, and the method comprises the steps that the battery temperature, the current pulse frequency and the current pulse current effective value of the vehicle are acquired; when the battery temperature is lower than a first temperature threshold value, querying a target pulse frequency and a target pulse current effective value from a preset pulse frequency table based on the battery temperature; and according to the current pulse frequency, the current pulse current effective value, the target pulse frequency and the target pulse current effective value, an excitation pulse is determined, the vehicle battery is heated based on the excitation pulse until the battery temperature reaches a second temperature threshold value, and charging is started. Therefore, the problems of low heating efficiency and high popularization cost of the heating technology of the power battery are solved, and the power battery can be heated in a low-temperature environment with high efficiency and low cost.

The invention discloses a lithium ion pool charge state detection method and system based on an electrochemical impedance spectroscopy, by obtaining impedance spectroscopy measurement data in a full charge state range, the data integrity of model construction is ensured, a foundation is laid for later model construction, a fractional order equivalent circuit model is adopted to fit impedance spectroscopy data, and the lithium ion pool charge state detection method and system based on the electrochemical impedance spectroscopy are obtained. According to the method, the actual electrochemical behavior of the battery can be described more accurately, the defects of a traditional integer order model during fitting of a non-ideal semicircular structure are overcome, the parameter identification precision is improved, SEI film resistance RSEI and a battery impedance value are screened out to serve as characteristic parameters to construct a battery SOC estimation model, the state estimation reliability is improved, and the reliability of the state estimation is improved. According to the method, the SOC of the to-be-detected battery is estimated based on the battery SOC estimation model, lossless, rapid and online detection of the battery is realized, and the method disclosed by the invention does not need complex iterative calculation or large-current pulse test and is high in parameter identification precision.

The invention discloses a servo turntable low-temperature friction adaptive compensation method, which belongs to the field of antenna servo control, and comprises the following steps: acquiring environment temperature, air pressure, wind speed and current parameters, and generating feature vectors; generating a working condition diagnosis label through pattern recognition; dynamically constructing an instantaneous friction response model from the physical effect library; executing an asymmetric high-frequency current pulse sequence in an extremely low temperature starting stage to break through static friction; based on model output and encoder micro-motion spectrum characteristics, a compensation mode is decided and activated through multi-mode collaborative logic; and calculating a composite compensation amount and superposing the composite compensation amount to a position loop for output. A multi-source environment perception and physical effect library dynamic combination mechanism is adopted, precise compensation can be achieved for severe working conditions such as plateau low pressure and strong wind disturbance, and the pointing precision and operation stability of the servo rotary table in the extremely cold complex environment are improved.

The application discloses a kind of carbon dioxide laser pulse signal quality detection and anti-interference control method and system, it is related to the field of device using stimulated emission, this method includes: when enabling effective state indication is effective, external pulse width modulation signal is sampled, and the sequence of multiple-point sampling buffer is obtained, the rising edge and the falling edge of external pulse width modulation signal are determined, and the pulse period measurement value and the pulse width measurement value of current pulse are calculated;Determine the preset duty cycle interval to which the duty cycle of current pulse belongs, and generate a duty cycle interval flag;Measure power measurement value, and compare with the proportional threshold value generated based on current pulse width measurement value, to determine power abnormal state;When power abnormal state is abnormal, determine shielding period in preset mapping table according to duty cycle interval flag, generate protection control signal, and perform anti-interference control to laser. By implementing the present application, abnormal detection and anti-interference control of laser output in a larger duty cycle range can be realized.

Circuits and apparatus for delivering a constant-current pulse with stability compensation into low impedance pyrotechnic loads are disclosed. One apparatus includes a power switch circuit including a high side connectable to an external device and for outputting current to the external device, a current sense circuit connected to the power switch circuit and for monitoring and limiting an amount of the current being output by the power switch circuit, a compensation circuit connected between the current sense circuit and the high side of the power switch circuit. The compensation circuit includes circuitry to provide gain and phase margin over a frequency range that provides stability in the current being output by the power switch circuit over a range of temperatures, input voltages, load impedances, and harness lengths. Systems that include the apparatus and / or perform the operations of the apparatus are also disclosed.

The invention relates to a method for generating an electromagnetic field by means of an applicator (5) with low-frequency current pulses (10), the low-frequency current pulses (10) being generated by a generator (3) for generating the electromagnetic field, a plurality of current pulses (10) following a signal profile, a respective current pulse (10) comprising a first signal component in the form of a rectangular pulse, a current pulse interval (16) is provided between the two current pulses (10), and the amplitude of the current pulses (10) is modulated with a modulation frequency in the sinusoidal signal curve. The invention further relates to a device for carrying out the method.

The invention provides an intelligent lamp and a no-disturbance working method thereof, and the method comprises the steps: obtaining a detection signal outputted by an AC power switch disconnection detection circuit, and judging whether a switch of the intelligent lamp is disconnected or not according to the detection signal; if it is determined that the switch is disconnected once, after the alternating current power supply switch disconnection detection circuit detects the alternating current pulse signal again, the switch disconnection count value is increased once; and judging whether the intelligent lamp is provided with the no-disturbance mode and the current time period is within the no-disturbance time period, if so, further judging whether the switch-off count value is greater than or equal to two times, if so, the intelligent lamp emits light according to the state of the last power failure, and if the switch-off count value is less than two times, the intelligent lamp does not emit light. The invention further provides the intelligent lamp for implementing the method. The intelligent lamp can be prevented from being powered on again after power failure at night to affect a user.

One example includes a superconducting data input system. The system includes an inductive coupler that generates first and second bias currents in response to receiving a current pulse. The system also includes a first clocked receiver configured to generate a first superconducting data signal having a first data state in response to the first bias current at a first phase of a clock signal, and a second data state in response to not receiving the first bias current at the first phase of the clock signal. The system further includes a second clocked receiver configured to generate a second superconducting data signal having the first data state in response to the second bias current at a second phase of the clock signal different from the first phase, and having the second data state in response to not receiving the second bias current at the second phase of the clock signal.

The embodiment of the invention discloses a method and related equipment for synchronously analyzing a thermodynamic phase and a dynamic phase in an electrode phase change process, a constant-current intermittent titration sequence is utilized, the dynamic phase and the thermodynamic phase of a to-be-detected electrode can be induced, synchronous acquisition is carried out at a specific moment in combination with in-situ X-ray diffraction, and the analysis result is accurate. Therefore, the kinetic phase and the thermodynamic phase of the to-be-tested electrode are distinguished, captured and defined by experimental means. Specifically, structure information collected in a constant-current pulse stage in a constant-current intermittent titration sequence corresponds to a kinetic phase and reflects transient and unbalanced structures in a phase change process; structural information collected after the open-circuit voltage relaxation stage meets a threshold condition corresponds to a thermodynamic phase and represents a stable structure tending to be balanced under the current composition; therefore, the dynamic phase and the thermodynamic phase of the electrode to be detected can be clearly analyzed. The method is widely applied to the technical field of material characterization.

The present application relates to the technical field of switch fault test, and especially relates to a power switch fault test device and a test method. The method comprises the following steps: deploying a switch multiplexing test fixture; controlling the switch multiplexing test fixture to perform contact current pulse excitation test on a power switch to be tested, and synchronously collecting contact group pulse response data; performing contact abnormal jump event evaluation, contact resistance fluctuation rate analysis and contact magnetic field abnormal mode analysis according to the contact group pulse response data; and then performing single-contact fault type analysis according to the contact magnetic field abnormal mode, the contact resistance fluctuation rate and the contact jump abnormal event evaluation data, so as to obtain power switch fault data. The present application realizes single-contact level fault detection by performing independent current pulse excitation test on each contact of the power switch.

The invention relates to the technical field of geological disaster prevention and control, and discloses an underground rock stratum water-bearing while-drilling nuclear magnetic resonance 3D imaging method which comprises the following steps: arranging a plurality of long lead grounding sources with the length of 500-1000 meters and the interval of 10-20 meters on the ground, and supplying alternating current pulses with the frequency of Ramole frequency to enable hydrogen nuclei in underground water to form macroscopic magnetic moment, after the excitation current pulse is cut off, the same coil is used for picking up nuclear magnetic resonance (NMR) signals generated by excitation of different excitation pulse moments; a receiving coil is installed behind the drill bit and dynamically receives FID signals along with advancing of the drill bit. A long wire grounding source is arranged on the ground to form an excitation magnetic field, and a receiving coil is mounted behind a drill bit to dynamically receive nuclear magnetic resonance signals while drilling, so that high-precision detection of the water-bearing property of an underground rock stratum from two dimensions of the earth surface and the underground is realized. The change of the aquifer and the potential water inrush hidden danger can be monitored in real time, and the detection precision and the resolution ratio are effectively improved.

The application discloses a single-machine electric tool anti-twisting control method, device and controller, belongs to the electric tool control technical field, and aims to solve the problem of the safety damage risk of the reaction force to the operator when the electric tool stops. The method steps are as follows: when the motor operates in a first mode, the load parameter of the motor is acquired; when the load parameter meets a first condition, the electronic commutation direction of the motor is kept unchanged and timing is started, and the first duty cycle of the current pulse width modulation signal is recorded; the duty cycle is reduced to a second duty cycle within a first time; after the third duty cycle is continuously reduced, the motor is controlled to operate in a second mode at the third duty cycle for a preset time period, and finally stops. The application does not need additional components such as gyroscopes, has low cost and compact structure, realizes smooth force unloading, avoids rigid recoil at the moment of stopping, guarantees the safety of the operator, and improves the man-machine experience.

A pulsed laser diode driver includes an inductor having a first terminal to receive a source voltage, and a second terminal, a source capacitor coupled between the first terminal of the inductor and ground, a bypass capacitor having a first terminal connected to the first terminal of the inductor and a second terminal connected to the second terminal of the inductor, a laser diode having a cathode that is connected to the first terminal of the inductor and an anode that is connected to the second terminal of the inductor, and a bypass switch connected between the second terminal of the inductor and ground. The bypass switch is configured to control a current flow through the inductor to produce a high-current pulse through the laser diode, the high-current pulse corresponding to a peak current of a resonant waveform developed at the anode of the laser diode.

The invention discloses a measurement regulation and control method and system of an atomization tester, and aims to solve the problem that a Peltier temperature control system is easy to generate overshoot and low-frequency oscillation at a critical point. The method comprises the following steps: S1, setting a target temperature and a precision tolerance interval; s2, rapidly cooling to a dynamic switching temperature; s3, switching to a precise approaching mode, and driving a Peltier by adopting a frequency self-adaptive micro-current pulse sequence based on the residual heat to realize overshoot-free temperature positioning; and S4, when the temperature meets the steady-state conditions of the mean value, the standard deviation and the trend slope, switching to a steady-state holding mode, performing spectral analysis on the temperature sequence to distinguish high-frequency disturbance and low-frequency drift, and only applying intelligent micro-compensation subjected to nonlinear filtering to the low-frequency drift. According to the invention, through multi-stage strategy matching, pulse control based on energy prediction and intelligent disturbance identification, rapid, accurate and stable control of the temperature of the condensation plate is realized, and the reproducibility of a test result is significantly improved.

The invention discloses a BOPP (Biaxially-oriented Polypropylene) rolling driving safety linkage control method, which relates to the technical field of industrial automation control and comprises the following steps: establishing an electromagnetic disturbance distribution diagram of a driving and rolling signal transmission path, extracting electromagnetic coupling strength distribution on the basis of a current pulse space diffusion track generated by a driving device and a rolling device in a start-stop stage, and calculating a driving speed of the driving and rolling signal transmission path; and dividing a strong coupling region and a weak coupling region according to the coupling strength to form a continuous electromagnetic characteristic band. The delay absorption layer and the reverse phase shift guide chain are arranged in a signal path, so that layered energy absorption and reverse phase counteracting are realized, electromagnetic pulse propagation is weakened, and false triggering is prevented; and meanwhile, a low-amplitude periodic slip signal is injected into the signal input end, so that the channel frequency generates micro-amplitude wandering, a dynamic self-adaptive anti-interference mechanism is formed, and stable and reliable signal transmission is ensured.