94 results about "Rise time" patented technology

The invention relates to the technical field of transformer substation monitoring, and discloses a partial discharge real-time monitoring system and method for a transformer substation switch cabinet. The method comprises the following steps: capturing an original signal data set which is generated by partial discharge in the switch cabinet and comprises a timestamp sequence and spectrum distribution; processing the set to segment the discharge pulses and background noise components, calculating the rise time, the energy integral value and the frequency bandwidth of each discharge pulse, and forming a set of discharge characteristic parameters; identifying a potential discharge risk mode based on the parameter set, and generating a dynamic configuration instruction containing monitoring priority ranking and parameter adaptive requirements; calling the instruction to modify the sampling interval and the detection sensitivity of the monitoring unit in real time, and executing the optimized signal acquisition process; and integrating and optimizing the real-time data flow in the acquisition process, updating the discharge characteristic parameter set, and iteratively generating a new dynamic configuration instruction. The method can improve the comprehensiveness, accuracy and real-time performance of partial discharge monitoring, and is suitable for the complex operation environment of the switch cabinet.

A method for driving a transistor is described herein. In accordance with one embodiment, method includes modulating an output voltage by cyclically switching a transistor on and off, wherein, in each switching cycle, a gate current having a first current level is supplied to the transistor to switch the transistor on. The method further includes determining a characteristic time parameter of the output voltage (e.g. a rise or a delay time) and determining an error representing the difference between the determined time parameter and a target time in each switching cycle; adjusting the first current level based on the error; and detecting an oscillation of the error. When an oscillation is detected, the adjustment of the first current level is paused until the magnitude of the error exceeds a threshold value in a second number of consecutive switching cycles.

This invention relates to an electrical device for defibrillation and a method for generating a defibrillation signal. The electrical device for defibrillation is controlled to generate a defibrillation signal from the nth R-wave (E) event inferred as an electrocardiogram waveform (50). n From the event inferred to be the (n+1)th R wave (E) n+1 The time interval up to the n+1th R wave (E) is the first time interval (T1) that exceeds the first predetermined time, and the time interval from the event (E) that is inferred to be the (n+1)th R wave is... n+1 When the rise time from the height of the waveform exceeding the first predetermined value (C1) to reaching the second predetermined value (C2) is less than the third predetermined time, the event (E) inferred to be the (n+1)th R wave is generated by the permit signal generation unit. n+1 A permit signal is generated when the first time interval (T1) is less than the first predetermined time, or when the event is inferred to be the (n+1)th R wave (E). n+1 When the rise time of the R wave exceeds the third specified time, the event (E) from the nth R wave of the inferred ECG waveform (50) is considered. n The event that is inferred to be the (n+2)th R wave (E) n+2 The time interval up to the second time interval (T2) exceeds the second specified time, and the event (E) that is inferred to be the (n+2)th R wave... n+2 When the rise time of the waveform from the height of the first predetermined value (C1) to the second predetermined value (C2) is less than or equal to the third predetermined time, the event (E) inferred to be the (n+2)th R wave is generated by the permit signal generation unit. n+2 Generate a permission signal.

The invention discloses an anomaly detection method based on time-domain joint features, which comprises the following steps: sampling different types of signals, extracting time-domain features including extreme values, rise time, fall time and pulse width, forming a comparison set for abnormal signal detection, then identifying a to-be-detected signal, and determining whether the to-be-detected signal is abnormal or not. The abnormal signal detection method based on the time domain joint features is realized.

Disclosed are a method and apparatus for controlling power supply output power, relating to the technique for controlling power supply output power. In the method, an initial output power is determined depending on a target output power, and an initial PID control parameter corresponding to the initial output power is acquired; the startup of the power supply is controlled using the initial PID control parameter such that the power output by the power supply at startup reaches the initial output power; the PID control parameter is adjusted until the output power of the power supply reaches the target output power, wherein the target output power satisfies an operating power requirement of a load, and wherein the difference between the initial output power and the target output power is within a preset error range.Thus, the problem in the prior art that the direct use of PID control to control the power output of a high frequency / DC power supply causes a long rise time of the power supply output power is solved.

The boost circuit is arranged to reduce the rise time and fall time of the pulse power for the pulse control operation of the motor. The boost circuit extracts the magnetic energy present in the motor at the end of the pulse to reduce the pulse fall time. The energy is stored by the boost circuit and then applied at the start of the subsequent pulse to reduce the rise time. By reducing the rise time and fall time compared to not using such a boost circuit, the motor efficiency is improved.

The application relates to the technical field of substation monitoring, and discloses a partial discharge real-time monitoring system and method for a switch cabinet of a substation. The method captures original signal data sets containing time stamp sequences and spectrum distributions generated by partial discharge in the switch cabinet; processes the sets to segment discharge pulses and background noise components, calculates the rise time, energy integral value and frequency bandwidth of each discharge pulse, and forms a discharge characteristic parameter set; identifies potential discharge risk modes based on the parameter set, generates dynamic configuration instructions containing monitoring priority sequencing and parameter adaptive requirements; calls the instructions to modify the sampling interval and detection sensitivity of a monitoring unit in real time, executes an optimized signal acquisition process; integrates real-time data streams in the optimized acquisition process, updates the discharge characteristic parameter set, and iteratively generates new dynamic configuration instructions. The method can improve the comprehensiveness, accuracy and real-time performance of partial discharge monitoring, and adapts to the complex operating environment of the switch cabinet.

The embodiment of the present application provides a table lookup circuit based on in-memory decoding of AES, a memory and a method, the circuit comprises: a voltage / time difference conversion circuit, a data output circuit and a decoding circuit; the voltage / time difference conversion circuit is used for applying different voltages to word lines connected with two storage units to make the two storage units discharge in turn, and forming an enabling signal with different voltage rising times according to different resistance states of the two storage units and different discharge speeds of bit lines; the data output circuit is used for making the two in-memory decoding units output logic signals respectively according to the rising time of the enabling signal; and the decoding circuit is used for generating a table lookup address according to the logic signals output by the two in-memory decoding units respectively, so that the time and power consumption of the table lookup circuit can be effectively reduced without limiting the bandwidth of data transmission.

This invention relates to a soft-start control method, apparatus, medium, processor, and switching power supply. The soft-start control method includes: a slope compensation step, which compensates for the rise slope of the open-loop soft-start voltage of the controller to ensure consistent output voltage rise time under different input voltages and loads; an output gain adjustment step, which increases the output gain when the output voltage of the switching power supply increases to a value greater than a first set value to prevent the output voltage from failing to rise monotonically or dropping under increased load when operating in BUCK DCM mode during startup; a slope adjustment step, which slows down the rise slope of the open-loop soft-start voltage when the output voltage of the switching power supply further increases to a value greater than a second set value, enabling closed-loop control; and a closed-loop control takeover step, where the controller switches the control loop from open-loop soft-start voltage control to closed-loop control based on the relationship between the open-loop soft-start voltage and the output voltage feedback signal. This invention improves the consistency of output voltage rise time.

The invention relates to the technical field of remote monitoring, in particular to a building electrical safety detection method and system based on the Internet of Things, and the method comprises the following steps: collecting the current and voltage power factor power cumulant and temperature of a power distribution loop through a unified period, verifying the time consistency, calculating a mean value, and describing a loop operation result; based on a power-current ratio and power factor correlation, an operation condition is discriminated, electrical characteristic discrete changes are analyzed under the same condition, current grades are divided, temperature rise time is correspondingly compared, electrical and thermal characteristic consistency verification is realized, and an electrical safety detection result is output. According to the method, through unified period multi-parameter cooperative acquisition and time consistency verification, current, voltage, power and temperature are enabled to be under the same operation reference, operation conditions are described by combining power accumulation amount with current and power factor association, electrical discrete changes are analyzed under the same conditions, and temperature rise sequence comparison is linked; the abnormal evolution trend is recognized in advance, and the distribution safety detection accuracy and stability are improved.

A time-discriminated scintillator light output measurement method is disclosed: The scintillator light generated by the sample under test under radiation source excitation is converted into an electrical signal; the electrical signal is amplified, and the rise time and pulse height of the digitized waveform are discriminated, acquired, and stored, or the long-gate integral value Qlong and the short-gate integral value Qshort are obtained. The pulse discrimination value PSD is obtained based on the long-gate integral value Qlong and the short-gate integral value Qshort; a two-dimensional distribution histogram of the low-light-output scintillator is generated with Qlong as the abscissa and PSD as the ordinate; the obtained two-dimensional distribution histogram is processed accordingly and projected onto the X-axis to obtain the scintillator energy spectrum; the full-energy peak in the energy spectrum is Gaussian fitted to obtain the center value and half-peak width, and then the light output and energy resolution of the scintillator are calculated. This invention can accurately detect and calibrate scintillator signals with low light output, with fast data acquisition speed and high output accuracy.

The application discloses a method for inhibiting thermionic emission based on TTM-MD simulation, which adjusts the energy distribution and delay time of double pulses to regulate the electron temperature, and obtains the maximum delay time introduced under the condition of meeting the processing requirements according to the relationship between the temperature rising time and the delay. The method can obtain the maximum delay introduced under the condition of meeting the processing requirements, reduces the electron temperature, and inhibits the thermionic emission.

The application discloses a transistor selection method, device and computer equipment for balancing current. The method comprises the following steps: acquiring a plurality of rise times corresponding to a plurality of transistors respectively and a target number of transistors for a parallel circuit, wherein the rise time is a time required for a drain-source voltage of the transistor to rise to a corresponding preset voltage measurement point during turn-off; selecting the target number of transistors from the plurality of transistors, traversing all selected combinations to obtain a plurality of parallel groups of the plurality of transistors; determining an average difference coefficient corresponding to each of the plurality of parallel groups of the plurality of transistors based on the plurality of rise times corresponding to the plurality of transistors respectively; and taking the plurality of transistors in a parallel group of transistors with the average difference coefficient less than a preset threshold as a plurality of target transistors, wherein the plurality of target transistors are used for the parallel circuit. The application solves the technical problems of high complexity and poor dynamic response of the current balancing control technology for the transistors of the parallel circuit.

An electronic circuit includes the following: a first circuit configured to generate a first output having a first voltage-rise time; a second circuit configured to vary, in accordance with data included in challenge data, the first output to a second output having a second voltage-rise time different from the first voltage-rise time; and a third circuit in which an initial value is inconstant, and in which an output value varies in accordance with the second voltage-rise time.

The present application belongs to the technical field of single-point damage of coil, and specifically discloses a single-point damage electrical detection method for flat wire stator coil, which synchronously collects partial discharge characteristic parameters such as discharge quantity and signal rising time during the process of applying test voltage to the flat wire stator coil to be measured, directly reflects the physical characteristics of the discharge channel, and compared with the single criterion method which only relies on voltage decay time, the present application realizes mechanism level recognition of discharge mode through multi-parameter fusion, can significantly reduce missed detection and false positives, and at the same time, when the multi-parameter characteristic recognition based on the stator coil is suspected to have single-point damage, the same test voltage is sequentially applied to the remaining phase and the partial discharge signal is collected, a cross-phase retest verification mechanism of the discharge mode is constructed, the authenticity of the defect signal is identified, the accuracy and reliability of the detection result are improved, and the fault tracing direction is clear, which provides traceable judgment basis for subsequent maintenance.

The invention discloses a multipath forming nuclear pulse processing method, which comprises the following steps of: performing filtering forming on an original pulse signal according to a trapezoidal forming method, dividing trapezoidal forming into n paths, sequentially increasing the rising time of the first path to the nth path, setting the flattop time of the first path as a minimum unit, and setting the flattop time of other paths as a fixed value L; taking the first path of filtering shaping waveform as a fast channel waveform, and taking the other paths of filtering shaping waveforms as to-be-selected shaping channel waveforms; when the rising edge of the fast channel waveform triggers an amplitude trigger threshold, taking the rising edge as a pulse and recording a trigger moment; calculating the time difference between each pulse and front and back pulses; and taking the time difference as a reference, and taking the to-be-selected forming channel waveform as a final forming channel waveform. According to the invention, a plurality of slow channels with different forming time are arranged, the channel with proper forming time is dynamically selected, and signals do not need to be discarded, so that more useful signals are obtained, and the accuracy of the signals is greatly improved.

The invention discloses a composite aging characteristic characterization method and device of a silicon carbide MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor), gate-oxide aging evaluation is carried out through static and dynamic characteristic fusion of threshold voltage drift and current rise time, and body diode bipolar degradation evaluation is carried out based on the change percentage of the on resistance of the silicon carbide MOSFET. And whether packaging aging occurs or not is judged through comparison between the change percentage of the on-resistance under the body diode voltage drop or different gate voltages and the offset of the on-resistance curve, so that precise decoupling of bipolar degradation and packaging aging of the body diode is realized, precise separation of gate-oxide aging, bipolar degradation and packaging aging of the body diode is realized, and the reliability of the device is improved. The technical problem that the existing aging characteristic decoupling characterization does not consider the influence of the bipolar degradation of the body diode, when the bipolar degradation of the body diode occurs in the device, whether the packaging degradation occurs at the same time is difficult to judge, and the accuracy of the aging characteristic characterization of the silicon carbide MOSFET is influenced is solved.

The present invention discloses a position sensorless control method for a switched reluctance motor based on phase current monitoring. When the motor is stationary, a small current is injected into each phase winding simultaneously, the current rise time or chopping frequency is detected, and the relationship between the time or frequency of each phase is compared to perform initial position partitioning; during the startup and normal operation of the motor, the current rise time or chopping frequency under different rotor positions is continuously collected, the time or frequency at the characteristic point is found and the threshold is updated; the current information of the non-conducting phase is monitored in real time and compared with the threshold. When the monitored value reaches the threshold, it is considered that the rotor passes the characteristic point position. The average speed of an interval is calculated with the help of characteristic point detection, and the rotor position at any time in the next interval is reconstructed using the average speed. The present invention can overcome the serious limitations of traditional position sensorless technology, such as high dependence on the motor inductance model, complex control process, and low universality of the solution, and can improve the simplicity and practicality of positionless control technology.

The present invention discloses a method and system for predictive current control of a permanent magnet synchronous motor, belonging to the technical field of permanent magnet synchronous motor control. When the torque instruction changes drastically in the medium and high speed range, the zero-beat predictive current control is very likely to cause output voltage saturation, resulting in the q-axis current being difficult to be excited to its instruction value by the saturated output voltage within one sampling cycle, thereby seriously reducing the dynamic performance of torque increase at medium and high speeds. To this end, the present invention first increases the rising rate of the q-axis current through a weak magnetic operation under the above circumstances, and then performs a torque increase operation at a greater q-axis current rising rate. An optimal weak magnetic current is determined based on the q-axis current rise time prediction algorithm, so that the total time required for the weak magnetic operation and the torque increase operation is minimized, which can effectively improve the torque dynamic performance of the zero-beat predictive current control at medium and high speeds.

The invention provides a life prediction method for time-dependent breakdown of an ultrathin high-k dielectric layer, and the method employs an improved ramp voltage test method, and specifically comprises the steps: applying an initial voltage to any to-be-predicted device, carrying out step-by-step boost at a set boost rate and rise time, and carrying out the residence of a preset time at each voltage step; the voltage is dropped back to the rated voltage after each time of boosting n times, and the boosting-dropping-back process is repeated until the voltage applied to the to-be-predicted device after the last time of boosting reaches 5 times of the rated voltage; and detecting and recording the leakage current of the to-be-predicted device after the voltage is boosted, dropped back and exceeds 5 times of the rated voltage each time, so as to obtain a ramp voltage test result. The leakage current data obtained by the method is subjected to stress tests for many times, and better fits the long-term aging trend of the device compared with a single direct high voltage test or a long-time standing test. The stepped rhythm balances the test efficiency and accuracy, so that the life prediction is stabilized in a credible interval.

The disclosure introduces a level-shifter including a boost circuit that provides a “one-shot” pulse (a self-annihilating pulse) with the transitioning edge of the output signal. The pulse can be used to produce a faster output rise time and reduce the overall footprint of a level-shifter compared to conventional level-shifters. In one example the level-shifter includes: (1) input circuitry configured to receive one or more input signals from one or more input voltage domains, (2) output circuitry configured to provide an output signal, based on at least one of the one or more input signals, for an output voltage domain, wherein an operating voltage of the output voltage domain is greater than an operating voltage of the one or more input voltage domains, and (3) a boost circuit connected to the output circuitry and configured to provide a current pulse for a transition edge of the output signal.

An apparatus and method are provided for estimating junction temperature in a metal-oxide-semiconductor field-effect transistor (MOSFET), such as a silicon carbide (SiC) MOSFET, by capturing switching transients in a source path. A measurement circuit detects a voltage across a stray inductive element during a turn-on or turn-off phase and converts the transient into a pulse having a width proportional to a rise time or fall time. A processor determines junction temperature based on the pulse width and stored correlations between transient durations and temperature. An auxiliary switch circuit may temporarily insert a gate resistance to facilitate transient capture. Aging effects are compensated by analyzing temperature-dependent variations in rise and fall times to adjust temperature estimation over the device lifetime. The system can be integrated into gate driver circuitry for real-time monitoring without substantial disruption to normal converter operation.

The invention discloses a SiC MOSFET extended SOA measurement method considering the crosstalk influence of a half-bridge structure, and belongs to the technical field of power semiconductors. The method comprises the following steps: giving a maximum forward crosstalk current value, and testing and establishing a mapping relation between maximum allowable bus voltage and bus voltage rise time under different grid resistance conditions; giving a maximum negative crosstalk voltage value, and testing and establishing a mapping relation between the maximum allowable bus voltage and the bus voltage drop time under different grid resistance conditions; and based on the mapping relation, establishing a positive crosstalk safe working area and a negative crosstalk safe working area, and forming a comprehensive crosstalk safe working area by taking the intersection of the two. According to the invention, the coverage of the dynamic overstress risk under the cooperative work of multiple devices is realized, the application stability and reliability of the SiC MOSFET in the half-bridge circuit are improved, and the technical problem that the traditional SOA evaluation is disjointed with the actual working condition is solved.

The invention relates to a self-adaptive dynamic performance optimization method and system for a source measurement unit, and the method specifically comprises the following steps: Step 1: signal collection and performance index extraction: controlling the source measurement unit to output a step signal, and collecting and outputting response waveform data; calculating rise time, stable time and overshoot of the current output waveform according to the output response waveform data; step 2, intelligent parameter recommendation: inputting the rise time, the stabilization time and the overshoot obtained in the step 1 into a pre-constructed intelligent recommendation algorithm model in real time to obtain an adjusted PID control parameter; 3, parameter boundary constraint and safety protection are carried out; step 4, updating the parameters of the controller and carrying out online iteration; according to the invention, multi-dimensional intelligent balance and optimization of dynamic performance are realized; and the method has high adaptivity and intelligent level.

The present invention discloses a nanosecond high-voltage pulse generator and a method for tracing the rise time of a high-voltage probe. The method comprises a system power supply, an auxiliary power supply, a single-chip microcomputer, a display control module, a direct current high-voltage drive circuit, a direct current high-voltage switch circuit, a discharge protection circuit, and a feedback protection circuit. The method can generate an adjustable high-voltage pulse with a rise time tr=1.4ns and an amplitude of up to 3kV. The high-voltage probe is attenuated and then connected to an oscilloscope with a bandwidth greater than twice that of the high-voltage probe to acquire a complete waveform. The rise time t is measured using the measurement function of the oscilloscope. If t=tr×(1±10%)ns, it is considered that the measurement system composed of the oscilloscope and the high-voltage probe can accurately acquire pulse signals with a rise time t≥tr (ns), thereby proving that the bandwidth B of the high-voltage probe is ≥350 / tr, thereby achieving traceability of the bandwidth of the high-voltage probe.

The invention relates to the technical field of program control systems, in particular to an illumination control method and system based on centralized constant-voltage power supply. Comprising the following steps: S1, collecting a control turn-on signal and a control turn-off signal of the lighting equipment, and obtaining the turn-on rise time, the turn-off fall time and the total response period of the lighting equipment; based on the start-up time, the turn-off fall time and the total response period, dividing the lighting equipment into start response delay equipment, turn-off response delay equipment and overall response delay equipment; and S2, obtaining a power supply radius over-limit group and a power supply radius normal group based on the start response delay equipment, the turn-off response delay equipment and the overall response delay equipment, and extracting an ambient light interference parameter and an equipment aging attenuation parameter. Synchronous response and energy-saving stable operation of a lighting system are realized by dynamically identifying and responding slow equipment, accurately positioning a power supply group, generating a control signal in combination with environment and aging parameters and adopting a jump grouping and step strategy.

The present invention discloses a method for generating a pulse signal, a pulse generating device, and a partial discharge measurement system, which relates to the technical field of signal generating devices, and solves the problems of relatively low pulse peak values of existing pulse generators and relatively large rise times of output pulses. The main technical solution is as follows: An AC signal source is obtained; the AC signal source is subjected to two-stage in-phase signal amplification processing to obtain an AC electrical signal; the AC electrical signal is successively subjected to rectification, voltage reduction, and delay processing to generate a pulse signal. The present invention performs signal amplification processing on the AC signal source to reduce the relative influence of external interference, obtains an AC electrical signal, and based on the subsequent rectification, voltage reduction, and delay processing, which play the roles of edge sharpening of the AC electrical signal, allowing the generation of narrow pulses to maximize the signal bandwidth, and reducing ringing, so that when the rise time of the pulse front decreases, the overshoot pulse peak value increases.

The application relates to a PID parameter setting method, system, device and medium based on phase analysis, which comprises the following steps: acquiring historical trend values and PID initial parameters of PV parameters, SV parameters and MV parameters in a control loop; performing phase analysis processing on each parameter according to a trend graph constructed by the historical trend values, so as to obtain phase feature points corresponding to each parameter and step change information of the SV parameters; when the SV parameters have step changes, adjusting the proportionality and integral time of the PID initial parameters according to the overshoot and the rise time obtained from the phase feature points of the PV parameters and the SV parameters; and when the SV parameters do not have step changes, adjusting the proportionality and integral time of the PID initial parameters according to the integral judgment index and the proportional judgment index obtained from the phase feature points of the PV parameters and the MV parameters. The application improves the setting speed and accuracy of the PID parameters and improves the application range of the PID setting software.

The application belongs to the technical field of inverter switch control, and specifically discloses a three-level inverter switch frequency control method, device, medium and equipment. The method comprises the following steps: collecting the actual output current of the output end of the three-level inverter in real time; calculating the instantaneous error of the actual output current and the preset reference current; calculating the rising time and the falling time of the instantaneous error within the hysteresis width to obtain a natural switch period; comparing the actual output current of the output end of the three-level inverter with a set threshold to determine whether the three-level inverter enters an active frequency conversion adjustment mode; and when the active frequency conversion adjustment mode is entered, taking the natural switch period as a reference, dynamically setting the turn-on time and the turn-off time to generate a controlled switch period, so that the active adjustment of the switch frequency of the three-level inverter is realized. By adopting the segmented frequency conversion hysteresis control, the application can improve the operation reliability of the three-level inverter and prolong the service life of the power device.

This invention discloses an artificial intelligence-based intelligent management system and method for remote monitoring of power grids, relating to the field of transmission line fault location technology. The method includes: acquiring fault traveling wave waveform data; extracting the first rise time, second rise time, and time difference between the traveling wave and the measurement points at both ends of the line; establishing a first relationship based on the principle of double-ended traveling wave ranging, describing the relationship between the time difference and the fault distance and the equivalent propagation velocity; establishing a second and third relationship based on the line's frequency variation characteristics, describing the relationship between the first rise time, second rise time, and the fault distance, the equivalent propagation velocity, and the line characteristic constant; and solving the three relationships simultaneously to obtain the equivalent propagation velocity, the fault distance, and the line characteristic constant corresponding to the current fault. This invention, by simultaneously solving the double-ended time difference and the rise time at both ends, achieves the synchronous completion of fault ranging and online calibration of the line's frequency variation characteristics, improving ranging accuracy.