71 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 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 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.

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 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.

The invention belongs to the technical field of inverter switching control, and particularly discloses a three-level inverter switching frequency control method and device, a medium and equipment, and the method comprises the steps: collecting the actual output current of the output end of a three-level inverter in real time; calculating an instantaneous error between the actual output current and a preset reference current; calculating rising time and falling time of the instantaneous error in the hysteresis width to obtain a natural switching period; the actual output current of the output end of the three-level inverter is compared with a set threshold value so as to judge whether the three-level inverter enters an active frequency conversion adjusting mode or not; and when the three-level inverter enters the active frequency conversion adjusting mode, the natural switching period is taken as a reference, and the turn-on time and the turn-off time are dynamically set, so that a controlled switching period is generated, and active adjustment of the switching frequency of the three-level inverter is realized. According to the three-level inverter, the operation reliability of the three-level inverter can be improved and the service life of a power device can be prolonged by adopting segmented variable-frequency hysteresis control.

The application is suitable for the technical field of electric power, and provides a battery residual capacity estimation method, device and terminal equipment, the method comprising: obtaining the isobaric rise time of a target battery under the current charging and discharging times; wherein the isobaric rise time is the time required for charging the output voltage of the target battery from a first voltage to a second voltage at a constant current; inputting the isobaric rise time and the size of the constant current into a pre-trained capacity estimation model to obtain the residual capacity of the target battery under the current charging and discharging times. The application can conveniently and accurately estimate the residual capacity of the battery.

Power conversion system, comprehensive: - a large number of interconnected power modules (1, 2); - a multitude of control circuits (7, 8) which each control the multitude of power modules (1, 2) based on input signals; - a multitude of correction sections (9, 10) which each correct the input signals fed into the multitude of control circuits (7, 8) based on a multitude of correction values; - a temperature detection section (3) that detects the operating temperatures of the plurality of power modules (1, 2); and - a calculation section (12), - estimates the current switching characteristics of the plurality of power modules (1, 2) based on the measured operating temperatures and a temperature dependence of the switching characteristics of the plurality of power modules (1, 2) and - the multitude of correction values ​​calculated based on the estimated current switching characteristics to reduce fluctuations in currents flowing through the multitude of power modules (1, 2), wherein the switching characteristic is at least a rise time, a fall time, a time period required to switch on, a time period required to switch off, a switch-on delay time, a switch-off delay time, a total value of a switch-on delay time and a rise time, and a total value of a switch-off delay time and a fall time.

A method and apparatus for transmitting a signal used for positioning. A first signal is generated, a first rising edge duration of the first signal being less than a first falling edge duration, the first rising edge duration being a duration of a rising edge of a main lobe waveform of the first signal, and the first falling edge duration being a duration of a falling edge of the main lobe waveform of the first signal; and the first signal is transmitted. The main lobe waveform of the signal generated by the embodiment of the application has a short rising time, and the shorter the rising time of the main lobe waveform is, the more conducive it is to distinguishing between two adjacent paths or more conducive to identifying the first-arrival path of the received signal. Therefore, if the first signal provided by the embodiment of the application is used for ranging, the receiving device can distinguish between multiple paths with smaller time delay intervals or more accurately determine the arrival time of the first-arrival path, thereby improving the ranging / positioning accuracy.

This invention discloses a method, apparatus, equipment, and medium for analyzing the breaking risk of high-voltage circuit breakers, used to assess the breaking failure risk of high-voltage circuit breakers and reduce the probability of breaking failure. The invention includes: obtaining the zero-crossing current change rate of the high-voltage circuit breaker under the influence of current harmonic components when a near-zone fault occurs; calculating the overall recovery voltage rise time of the high-voltage circuit breaker based on the zero-crossing current change rate; calculating the first peak voltage reached by the transient recovery voltage across the high-voltage circuit breaker before the disappearance of the line-side oscillation voltage based on the overall recovery voltage rise time; calculating the initial recovery voltage rise rate of the high-voltage circuit breaker using the overall recovery voltage rise time and the first peak voltage; determining whether the initial recovery voltage rise rate is greater than a preset threshold; if so, determining that the high-voltage circuit breaker has a breaking failure risk.

The application discloses a high-voltage isolating switch temperature rise abnormality early warning method, and belongs to the technical field of high-voltage electrical equipment state monitoring. The method synchronously collects multi-source data such as contact temperature, load current, environmental parameters and three-phase unbalance degree, introduces an oxide layer mapping factor to construct a dynamic contact resistance correction model after normalization preprocessing, and completes multi-field coupling temperature rise prediction in combination with a temperature and humidity dynamic heat dissipation coefficient. The method distinguishes transient fluctuations from long-term abnormalities through temperature rise time sequence trend entropy value, weightedly calculates a comprehensive abnormality risk coefficient, realizes graded early warning, and completes model parameter closed-loop self-correction and threshold iteration based on the early warning result. The application solves the problems of high false alarm and missed alarm rates of traditional fixed threshold early warning, and cannot adapt to working condition changes. The application can accurately identify hidden faults such as contact oxidation and poor contact, has high early warning precision and strong adaptability, and is suitable for online monitoring and fault early warning of high-voltage isolating switches of various voltage grades.

The invention discloses a multi-branch area protection method for a direct-current power supply system in an extreme scene, and the method comprises the steps: S1, determining a main branch unit from each branch unit in a submarine direct-current power supply network, deploying a measurement device on the main branch unit, and enabling an area between every two adjacent main branch units to be called as a protection area; s2, after it is judged that a fault occurs, initial fault currents IFC: imn and imn between trunk branch units m and n in Tw after the fault are collected, imn represents the initial fault current flowing from m to n, imn represents the initial fault current flowing from n to m, and imn represents the initial fault current flowing from n to m, average values of derivatives of imn and imn are calculated respectively, and a protection area where the fault is located is determined according to a preset average value threshold value; and S3, calculating the change trend of the imn and imn derivatives, calculating the fault probability according to the initial rise time and rise amplitude of the imn and imn derivatives, and determining the line where the fault is located according to the change trend and the fault probability.

Examples of fault location in a power transmission line connecting a first and a second terminal is described. In an example, arrival times of a first peak, a second peak, and a third peak of a travelling wave detected from measurements carried out at the first and second terminals is detected. A rise time associated with the first peak of the travelling wave is calculated. One of a first half and a second half of the power transmission line is identified, as having a fault, based on a comparison of the rise time. One of a first segment, a second segment, a third segment, and a fourth segment of the power transmission line is identified as having the fault. Length of the power transmission line is estimated. The fault location is estimated based on identification of one of the first, second, third, and fourth segments as having the fault.