46 results about "Rise time" patented technology

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 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.

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 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.

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.

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.

The invention relates to the technical field of electric power, and discloses a commutation detection method, which comprises the following steps: through collaborative analysis of double-valve current signals, realizing dynamic double-feature extraction and accurate quantitative characterization of an exit valve rebound rate and conduction valve rise time in a commutation process, and utilizing geometric constraint characteristics of a preset parabola criterion equation to obtain a commutation result; according to the method, commutation state judgment is converted into geometrical relationship judgment of a criterion value and a threshold boundary, so that real-time online detection of a commutation process and accurate identification of a fault state are realized, the delay defect of an extinction angle actual measurement method is overcome, the misjudgment risk of an alternating current voltage prediction method is avoided, meanwhile, the robustness of a single current characteristic method is improved, and the method is suitable for popularization and application. And finally, the real-time performance is remarkably improved on the basis of ensuring the detection accuracy, the detection reliability of the commutation process of the high-voltage direct-current power transmission system is effectively improved, and the stability and the safety of system operation are enhanced.

The invention relates to a gate oxide state monitoring method and circuit of a field effect transistor, and belongs to the technical field of power electronics, and the method comprises the steps: obtaining a drain current signal of a to-be-monitored field effect transistor in a switching-on transient process; determining the current rise time of a field effect transistor based on the drain current signal; wherein the current rising time is the time that the drain current rises from the flowing start time to the load current time; and comparing the current rise time with a preset health reference time, and outputting an indication signal reflecting the reliability state of the gate oxide layer based on a comparison result. According to the method provided by the invention, non-intrusive online real-time monitoring is realized by taking the current rise time as a gate oxide degradation specificity monitoring parameter, collecting the drain current signal in the device turn-on transient state and comparing the drain current signal with the health reference time.

The invention discloses a pantograph rising time detection method and device. The pantograph rising time detection method comprises the following steps that S1, whether the current pantograph net voltage value meets the conditions or not is judged, wherein the pantograph net voltage value is larger than a first set voltage value, and the pantograph net voltage value rising speed is larger than a set speed value; if yes, the current moment is determined as the pantograph rising starting moment; s2, when the current pantograph net voltage value is larger than a second set voltage value, the current moment is determined as the pantograph rising completion moment; and S3, subtracting the pantograph rising start time from the pantograph rising completion time to obtain pantograph rising time. Due to the adoption of the technical scheme, compared with the prior art, the pantograph rising time detection method is lower in cost compared with an existing pantograph rising time detection method based on image recognition. And secondly, the pantograph rising time cannot be different due to different heights of the contact network, and a unified standard can be set for the normal pantograph rising time length, so that whether the pantograph rises normally or not can be judged more accurately.

1. The name of the design product: oscilloscope. 2. The use of the design product: measure the key indicators such as peak-to-peak voltage, effective value, frequency, phase difference, rise time, etc. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The invention relates to a high-altitude electromagnetic pulse simulation device, in particular to an all-solid-state high-altitude electromagnetic pulse standard source based on a multi-tube series avalanche tube Marx circuit. The technical problem that due to inherent parasitic inductance existing in a discharge loop of an existing multi-tube series avalanche tube Marx circuit, output pulses cannot meet the requirements of high amplitude, fast leading edge and low jitter at the same time is solved. The standard source comprises a direct current charging power supply, a trigger unit, an avalanche transistor Marx circuit, a coaxial output cable, a radiating antenna and a waveform modulation structure. A multi-tube series avalanche tube Marx circuit topological structure is improved, an additional waveform modulation structure is introduced, the rising time of output pulses is effectively shortened, the technical problem that the pulse leading edge of a multi-tube series circuit is broadened due to parasitic inductance is solved, and the output pulse of the multi-tube series circuit is increased. And the high-altitude electromagnetic pulse waveform which is high in amplitude, fast in leading edge and low in jitter and meets the requirements of the international electrician committee standard can be generated.

The purpose of the present invention is to accurately detect the operating state of a movable element of an electromagnetic actuator. A control device (10) is a device for controlling an electromagnetic actuator (200) having a stator (206), a coil (205), and a movable element (204) that operates on the basis of a current supplied to the coil (205). A control device (10) is provided with: an energizing unit (11) that switches energization to a coil (205) and supplies a switching current to the coil (205); and a switching detection unit (13) that detects the increase and decrease in the switching current. A switching state calculation unit (14) that calculates a ratio (T1 / T2) between the rise time (T1) and the fall time (T2); a switch state change detection unit (15) that detects a change in the calculated ratio; and an operation state detection unit (16) that detects the operation state of the movable element (204) on the basis of the detected change in the ratio.

A low-power clock buffer circuit is disclosed that reduces crowbar current and improves power efficiency across a wide range of supply voltages. The circuit comprises an input stage with current-limited PMOS and NMOS transistors, and an output inverter stage with split-gate drive. The input stage uses current sources to control the rise and fall times of signals driving the output inverter, creating a delay between the activation of the PMOS and NMOS transistors in the output stage. This delay minimizes the duration when both output transistors are simultaneously conducting, significantly reducing crowbar current. An alternative embodiment includes a current-starved latch in the output stage to mitigate floating node situations and enhance signal integrity. The circuit is suitable for clock distribution networks in large digital systems.

The present application belongs to the technical field of health state monitoring of flexible direct current valve sub-modules, and discloses a method, system, device and medium for extracting electromagnetic pulse signals of IGBT switches of flexible direct current valve sub-modules, to solve the problems of loss of pulse rising edge, improper interception length, inability to adapt to variable noise and disorder of probe direction caused by the existing single threshold method. The method comprises: acquiring continuous voltage signals by an electromagnetic pulse probe and performing discrete sampling; generating an energy envelope curve through sliding window absolute value low-pass smoothing; adaptively calculating double thresholds based on background noise statistical characteristics; when the envelope curve exceeds the high threshold, determining the starting point through left backtracking, determining the termination point through right maintenance confirmation window, and extracting complete pulses; using the asymmetric law that IGBT turn-on is faster than turn-off, calibrating the probe polarity through the rising time of the cumulative integral curve of adjacent pulses, and classifying the pulses into turn-on or turn-off signals accordingly.

The invention belongs to the technical field of coil single-point damage, and particularly discloses a flat wire stator coil single-point damage electric detection method, which comprises the following steps of: synchronously acquiring partial discharge characteristic parameters such as discharge capacity and signal rise time in the process of applying test voltage to a flat wire stator coil to be detected, and directly reflecting the physical characteristics of a discharge channel; compared with a single criterion method which only depends on voltage decay time, the mechanism-level identification of the discharge mode is realized through multi-parameter fusion, missing detection and false alarm can be obviously reduced, and meanwhile, when the suspicion of single-point damage of the stator coil is identified based on multi-parameter characteristics, the accuracy of single-point damage of the stator coil is improved. By applying the same test voltage to other phases in sequence and collecting partial discharge signals, a cross-phase retest verification mechanism of a discharge mode is constructed, authenticity discrimination of defect signals is realized, the accuracy and reliability of a detection result are improved, the fault tracing direction is clear, and a traceable judgment basis is provided for subsequent maintenance.

This synchronization device is provided with a control unit, a clock, and a synchronization unit. The synchronization device is characterized in that the synchronization unit directly controls the rising timing of an oscillator included in the synchronization device to achieve frequency and phase synchronization such that the frequency and the phase match those of an oscillator included in another synchronization device.

This invention discloses a transistor selection method, apparatus, and computer device for loss equalization. The method includes: acquiring multiple first rise times, multiple second rise times, and a target number of transistors for parallel circuits for each of multiple transistors; selecting the target number of transistors from the multiple transistors, iterating through all selection combinations to obtain multiple transistor parallel groups; determining an average difference coefficient for each of the multiple transistor parallel groups based on the multiple first rise times and multiple second rise times; and selecting multiple transistors in the parallel groups whose average difference coefficients satisfy a preset condition as multiple target transistors, wherein the multiple target transistors are used in the parallel circuit. This invention solves the technical problems of high complexity and poor dynamic response in current transistor switching loss equalization control techniques for parallel circuits.

This invention discloses a method and circuit for controlling the synchronous rectifier diodes in a dual-clamp converter. The method obtains the total equivalent resonant inductance and clamping capacitor on the primary side by constructing a simplified model of the equivalent circuit during the power transfer stage; it designs the total equivalent damping resistance to be greater than the critical damping resistance, enabling the converter to operate in an overdamped state; it designs the minimum on-time of the synchronous rectifier drive to be greater than the critical damping rise time; and it calculates the turn-off compensation voltage based on the rated output voltage, transformer turns ratio, and magnetizing inductance, and sets the turn-off threshold voltage accordingly. This invention effectively suppresses inductive voltage component interference caused by package parasitic inductance, avoids premature turn-off of the synchronous rectifier diodes, reduces conduction losses, and improves converter efficiency and output voltage control accuracy. It also has advantages such as simple parameter adjustment and strong versatility.

This invention discloses a multi-branch area protection method for a DC power supply system in extreme scenarios, comprising: S1: determining the main branch unit from each branch unit in the submarine DC power supply network, deploying a measuring device on the main branch unit, and defining the area between every two adjacent main branch units as the protection area; S2: after determining that a fault has occurred, collecting data after the fault. T w Internal main branch unit m and n Initial fault current IFC: i mn and i nm ,in i mn express m Flow direction n The initial fault current, i nm express n Flow direction m The initial fault current was calculated separately. i mn and i nm The average value of the derivative is used to determine the protection zone where the fault is located based on a preset average value threshold; S3: Calculation i mn and i nm The trend of the derivative, and according to i mn and i nm The initial rise time and rise amplitude of the derivative are used to calculate the fault probability, and the fault location is determined based on the trend and fault probability.

In a power supply control device 1 according to the present invention, comprising a current sensor 2 with a magnetic sensor 4 which detects magnetism generated when a current to be measured flows through a busbar using a magnetoresistive element, wherein the current sensor 2 is capable of measuring the current to be measured; and a determination unit 7 which determines whether an overcurrent has flowed through the busbar, wherein the determination unit 7 measures a current rise time, which is the time required for an output voltage of the current sensor 2 to rise from 0 to a maximum value, and a current fall time, wherein the current fall time is the time required for the output voltage of the current sensor 2 to fall from the maximum value to 0, obtains a current rise / fall time difference, which is the difference between the current rise time and the current fall time.and determines, based on the current rise / fall time difference, whether the overcurrent has flowed through the busbar. This allows the power supply control device 1 to detect an overcurrent that occurs when the current sensor is not operating, in addition to the case when the current sensor is operating, without reducing the accuracy of the current sensor when measuring a normal output.