120 results about "Rise time" patented technology

The invention discloses an intelligent identification inversion and reproduction method for typical faults of a transformer substation, which comprises the following steps of: calculating a time domain discrete characteristic value by extracting time-frequency domain characteristics of fault recording analog quantity signals; fault recording switching value characteristic parameters including a rising time sequence position coefficient, a falling time sequence position coefficient and an action time proportion coefficient are extracted, and the two types of characteristic values are combined to form an analog-switch fusion characteristic (ASFF); a DC1DCNN-AlexNet model of which the voting weight is optimized by an attention mechanism is constructed; and the two types of ASFF data are respectively input into a DC1DCNN-AlexNet-Attention voting model, and the characteristics of different fault modes are learned and identified by training the DC1DCNN + AlexNet-Attention model. And according to the identified fault type, reproducing a corresponding acousto-optic fault phenomenon.

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.

To provide a test method for a device under test which is a switching element.SOLUTION: A test method for a device under test includes the steps of: applying a gate voltage of a predetermined first pulse to the device under test; measuring a turn-off loss of the device under test on the basis of a collector current during a rise time thereof, the collector current flowing through the device under test according to the first pulse; and measuring a reverse bias safe operation area of the device under test on the basis of the collector current during a fall time of the collector current according to the first pulse.SELECTED DRAWING: Figure 3

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.

The invention provides a standard electronic transformer angular difference traceability device and method based on square waves, and belongs to the technical field of power system measurement. And the delay phase determination module is used for determining a fundamental wave delay phase corresponding to the square wave voltage signal according to the rising time or falling time of the square wave voltage signal. And the standard analog-to-digital conversion mutual inductance module is used for carrying out filtering and analog-to-digital conversion sampling on the square wave voltage signal according to the clock synchronization signal to obtain a digital voltage signal. And the calibration angle difference determination module is used for carrying out discrete Fourier transform on the digital voltage signal to obtain a fundamental wave phase corresponding to the digital voltage signal, and carrying out angle difference tracing on the detected electronic transformer according to a calibration angle difference obtained by calculating the fundamental wave phase and a fundamental wave delay phase. Through the device and the method provided by the invention, the calibration angular difference of the standard analog-to-digital conversion mutual inductance module can be accurately obtained, the tested electronic transformer is traced, the accuracy of angular difference traceability is improved, and the problem of low accuracy is solved.

The invention relates to the technical field of data line detection, and discloses a data line detection method and system and a storage medium, and the method comprises the steps: obtaining a parameter value and a standard value of a data line; calculating the transmission efficiency of the data line according to the length, the diameter and the resistance value; comparing the transmission efficiency with the standard signal transmission efficiency, and outputting a signal detection result; connecting the data line to a tester, and detecting to obtain the voltage, the current and the rise time of the data line; calculating a data loss value according to the data; comparing the data loss value with a standard data loss value, and outputting a data detection result; and summarizing the signal detection result and the data detection result to obtain transmission performance data of the data line. The method has the advantages that parameter values of the data line and working data such as voltage and current of the data line are obtained, a preset algorithm is used for calculating the data and comparing the data with various preset standard values, and therefore transmission performance data of the data line to be tested are obtained.

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 provides an electronic load for simulating the power utilization characteristic of a TR assembly, and belongs to the field of power electronic equipment, and the electronic load comprises a plurality of T / R assembly simulators and a master controller used for controlling the T / R assembly simulators to work. The T / R assembly simulator comprises a plurality of T / R assembly simulation units, a simulator controller used for controlling the T / R assembly simulation units to work, and a simulator communication control module used for communication among the plurality of T / R assembly simulators. The T / R assembly simulation unit further comprises a high-speed MOS tube, a high-speed gate driver, a voltage regulation module, a controller module and a current monitoring module, PWM is generated and controlled by using the high-speed gate driver, the rise time and the switching process of the high-speed MOS tube are both in an ns level and are close to open-loop control, meanwhile, the gate GS peak voltage is dynamically regulated through PID by using the feedback drain current, and the voltage of the high-speed MOS tube is regulated. The drain current is stabilized near a set value, high rise time is obtained, and relatively stable pulse control current is obtained.

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 invention discloses a negative-sequence current control method and system applicable to a grid-following and grid-constructing converter, and relates to the technical field of grid-connected converter control, and the method comprises the steps: obtaining the negative-sequence voltage of an alpha-beta coordinate system of a converter grid-connected point and the negative-sequence voltage of a dq coordinate system of the converter grid-connected point; calculating an alpha-axis component and a beta-axis component of the negative-sequence control voltage of the converter based on the negative-sequence voltage of the alpha-beta coordinate system of the grid-connected point; calculating to obtain a d-axis component and a q-axis component of the negative-sequence control voltage of the converter based on the negative-sequence voltage of the dq coordinate system of the grid-connected point; and calculating the control voltage of the converter based on the negative sequence control voltage of the alpha-beta coordinate system or the negative sequence control voltage of the dq coordinate system. The method does not depend on a current loop, the rising time of the negative sequence current is less than or equal to 100ms, and the method improves the negative sequence reactive power support speed of the converter to the system under the asymmetric fault.

The present invention discloses a timing controller, a display device and a method. By collecting the rise time of a target differential signal received by a source driver and comparing the size relationship between the collected rise time and a preset time, the difference between the target differential signal received by the source driver and the target differential signal output by an output module can be determined. This difference can usually be considered to be caused by the loss generated by wire transmission, so the rise speed of the intermediate differential signal can be adjusted according to the difference to compensate for the difference caused by the loss of wire transmission, increase the signal-to-noise ratio of the target differential signal, so that the target differential signal received by the source driver meets the requirements, thereby improving the signal transmission quality and further improving the display effect.

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.

A switch controller coupled to control a transistor. The switch controller comprising an interface coupled to receive a command signal in response to an event sensed in a control system. The command signal is representative of a first command to control the transistor with a first drive strength or a second command to control the transistor with a second drive strength. The switch controller is coupled to adjust a fall time or a rise time, or to adjust both the fall time and the rise time, of a voltage across the transistor in response to the command signal. The fall time or the rise time, or both the fall time and the rise time in response to the second command is shorter than the fall time or the rise time, or both the fall time and the rise time in response to the first command.

The present invention relates to the field of power system equipment maintenance, and in particular to a partial discharge detection method, device and storage medium. The method is aimed at ultra-short rise time square wave high electric field. After obtaining partial discharge signal data and interference signal data, the corresponding spectrum characteristics are extracted, and the spectrum difference between the partial discharge signal and the interference signal is calculated; the first frequency interval when the spectrum difference is greater than the first threshold is calculated, and the signal outside the corresponding first frequency interval is filtered to obtain the filtered partial discharge signal and the residual interference signal, and the first threshold is determined by the spectrum difference; based on the filtered partial discharge signal, the residual interference signal and the pre-set spectrum difference database, the second frequency interval is predicted, and the second frequency interval is adjusted by a negative feedback mechanism to extract the partial discharge signal under the highest signal-to-noise ratio. Compared with the prior art, the present invention has the advantages of improving the anti-interference ability in the PD detection process, effectively suppressing interference and improving the stability of PD signal extraction.

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.