125 results about "Initial current" patented technology

The invention relates to the technical field of semiconductors, in particular to a high-temperature reverse bias test method, an electrostatic discharge protection structure and electronic equipment, and the method comprises the steps: providing the electrostatic discharge protection structure; determining an initial leakage current at the initial voltage, and determining an initial breakdown voltage at the initial current; heating the electrostatic discharge protection structure for a preset time at a preset temperature and a preset voltage, and determining a target leakage current of the heated electrostatic discharge protection structure under the initial voltage and a target breakdown voltage of the heated electrostatic discharge protection structure under the initial current; performing current change analysis on the initial leakage current and the target leakage current to obtain a current change result, and performing voltage change analysis on the initial breakdown voltage and the target breakdown voltage to obtain a voltage change result; and according to the current change result and the voltage change result, generating a high-temperature reverse bias test result of the electrostatic discharge protection structure. According to the invention, the reliability of the electrostatic discharge protection structure can be accurately evaluated.

The invention relates to the technical field of photoelectric detection, in particular to a global self-defined sampling method based on a germanium-silicon photoelectric detector array, which comprises the following steps of: S1, constructing the germanium-silicon photoelectric detector array with an n * t specification, receiving a target optical signal by using each detector unit as a pixel point, converting the target optical signal into an initial current signal, the signal is linearly amplified into a voltage signal through an external transimpedance amplifier; s2, digitalizing the voltage signal into a binary discrete digital signal through a high-speed analog-to-digital converter at the output end of the trans-impedance amplifier; and S3, performing global synchronous sampling to obtain a first group of data, performing repeated sampling in the same mode to obtain multiple groups of data, performing pixel-by-pixel superposition to generate fused data, and performing user-defined setting on the repeated sampling frequency within 1-1024 times. By customizing the number of repeated sampling times and data superposition, adapting to different light intensities and expanding the detection dynamic range, the problems of strong light overexposure and weak light underexposure are solved, the data consistency is guaranteed in combination with global synchronous sampling, and the detection precision and the environmental adaptability are improved.

The embodiment of the invention provides a transformer no-load closing angle control method, electronic equipment, a storage medium and a program product. The method comprises the following steps: periodically sampling three-phase voltages at a power supply side of a transformer, and determining a zero crossing moment when the phase voltage is changed from a negative value to a positive value according to respective sampling data for each phase in the three phases; based on the zero point moment of each phase, a preset switching-on angle and the total delay required from the switching-on instruction sending to the actual conduction of the main circuit, the target moments at which the switching-on instructions of the three phases should be sent out are calculated respectively, and corresponding switching-on trigger signals are output at the target moments of the phases respectively; and in response to the closing trigger signal of each phase, combined switch circuits arranged in the three-phase line are respectively driven, and each group of combined switch circuit comprises an MOS (Metal Oxide Semiconductor) tube and a dry reed relay which are connected in parallel, so that the MOS tube is conducted to establish an initial current path.

The invention provides an alternating-current weak current high-precision detection system and method, and the system comprises a copper-nickel alloy shielding cover which is used for inhibiting space power frequency radiation interference and power system broadband noise, and a magnetic sensitive element which is used for converting the detected magnetic field change into a corresponding initial current signal, the trans-impedance amplifier is used for converting the initial current signal into a voltage signal; the adaptive noise suppression module collects a power frequency fundamental wave reference signal and a harmonic wave reference signal, generates a harmonic wave anti-phase counteracting signal, and performs anti-phase counteracting on real noise of the initial current signal; the analog-to-digital converter is used for converting the voltage signal into a discretized digital signal, and the discretized digital signal comprises a target signal and a random noise signal; and the FPGA coherent demodulation module is used for carrying out cross-correlation operation and narrow-band filtering on the target signal and the random noise signal to separate out a micro-current signal. The technical problems that in the prior art, composite noise covering is limited, the frequency fluctuation adaptability is poor, and microvolt-level signals are difficult to capture are solved.

A circuit device includes a charging circuit configured to charge a battery and a control circuit configured to control the charging circuit. The battery is provided with a protection circuit of the battery that comes into a shutdown state when the battery is in an over-discharge state. The control circuit causes the charging circuit to increase the charging current from an initial current value larger than zero to start constant-current charging of the battery when the shutdown state of the protection circuit is released.

The invention relates to the technical field of electrical measurement, in particular to a current measurement method and device, computer equipment, a storage medium and a product. The method comprises the following steps: carrying out output current measurement on to-be-measured equipment based on at least one range channel to obtain an initial current value corresponding to each range channel at the current moment; fusing the initial current values to obtain a comprehensive current value at the current moment; and performing current correction on each initial current value according to the comprehensive current value to obtain a target current output by the to-be-tested device. The method can realize long-term high-precision measurement while ensuring real-time performance, reduces manual calibration cost, has a wide application prospect, and is suitable for various scenes such as power distribution networks, factory power monitoring, energy efficiency analysis and protection systems and the like.

This application provides a dimming circuit and adjustment method for a light-emitting element. The dimming circuit includes a signal receiving terminal, a signal enabling terminal, a signal conditioning circuit, and a signal detection circuit. The signal conditioning circuit is electrically connected to the signal receiving terminal, the signal enabling terminal, and the light-emitting element. The signal conditioning circuit controls the light-emitting element to be energized when the enabling signal is active. The signal detection circuit is electrically connected to the signal receiving terminal, the signal enabling terminal, and the signal conditioning circuit. The signal detection circuit outputs a detection signal with a first state to the signal conditioning circuit when both the enabling signal and the driving signal are active. This allows the signal conditioning circuit to control the output current of the light-emitting element to rise from an initial current value based on the driving signal, thereby performing dimming. The initial current value is greater than zero. This application can shorten the current stabilization time, achieve rapid start-up, and improve the dimming speed.

The application discloses a signal equalization device, system and method, and belongs to the electronic information technical field. The signal equalization device comprises an adder and a controller. The first input end of the adder is connected with a signal source. The output end of the adder is connected with the input end of the controller. The output end of the controller is connected with the second input end of the adder. The adder receives a target signal generated by the signal source and a control signal output by the controller. The target current is determined according to the control signal. The target signal is equalized according to the target current, and an equalized signal is obtained. The control signal is determined by the controller according to characteristic information. The characteristic information indicates the signal rate of a first signal output by the adder to the controller. The first signal is obtained by equalizing a previous signal of the target signal by the adder according to an initial current. The application determines the current according to the signal rate, so that the adder can generate stable gain to the signal in the equalization process according to the current.

Automated operation methods and systems for a power machine are provided. A system includes implementing travel control for an electric power machine (600). The system may include an electronic processor (700) configured to determine a target lift position and an initial current for maintaining a load at the target lift position. The electronic processor (700) may also be configured to determine an update current for returning the load to the target lift position based on a positional deviation of the load from the target lift position. The electronic processor (700) may also be configured to control the electrical lift actuator (675) using the update current to return the load to the target lift position.

A band-gap reference voltage source with high-precision segmented compensation comprises three core circuit units, namely a starting circuit, a core band-gap circuit and a segmented temperature compensation circuit. The three core units are controlled by the following circuits: when a power supply is powered on, a starting circuit is conducted, an initial current is injected, and a core band gap circuit is started and outputs a basic voltage; the segmented compensation circuit synchronously extracts PTAT current and generates temperature coefficient compensation voltage Vcomp, and the temperature coefficient compensation voltage Vcomp and the Vbg are subjected to weighted superposition to offset nonlinear drift so as to stably output reference voltage. Compared with the prior art, multi-dimensional performance jump is realized through a temperature coefficient complementation-dynamic curvature compensation-power supply suppression enhancement collaborative architecture.

The invention discloses a method and a device for calculating short-circuit current of an electric power system, a medium and a terminal, relates to the technical field of short-circuit current calculation of the electric power system, and mainly aims to solve the problem that the short-circuit current of a multi-source heterogeneous electric power system cannot be accurately calculated in the prior art. Comprising the following steps: simulating a short-circuit fault in a simulation environment of a target power system, and constructing a non-fault node admittance matrix; calculating an initial current value of each power supply node to obtain an initial system-wide node injection current vector of the target power system, calculating a quotient between the initial system-wide node injection current vector and a non-fault node admittance matrix to obtain a first iteration system-wide node voltage vector of the target power system, and constructing an iteration solution equation; and performing iterative solution on the basis of the iterative solution equation until a preset convergence condition is met, obtaining a full-system node voltage vector after iteration is completed, and calculating the short-circuit current of the target power system according to the full-system node voltage vector after iteration is completed.

The invention provides a test screening method and system for enhancing electrical interference resistance of a chip, and belongs to the technical field of integrated circuit testing, and the method comprises the steps: building a topological network interference model which comprises a topological connection relation among a chip power pin, a grounding pin and a signal pin, the interference source parameters are set according to the rated voltage range and the interference distance of the chip; constructing an interference path to form three groups of test structures; obtaining current distribution parameters, including determining an initial current value, calculating a voltage drop value and determining a test current value; executing an interference simulation test; when the simulation result meets a preset condition, dynamically adjusting the distance between the test structures in the topological network interference model to form an optimized test model; and performing chip batch screening according to the optimized test model, constructing an accurate interference model according to a topology network theory, optimizing current distribution parameters, dynamically adjusting a test structure, and realizing high-precision test and efficient screening of the anti-electrical interference capability of the chip.

The invention provides a multi-resonant switched capacitor efficient cooperative operation method suitable for battery active equalization, and the method comprises the steps: building a zero-voltage soft switching realization condition model of a single-module resonant unit, and determining the amplitude constraint and direction constraint of a soft switching current needed by a switching tube for realizing zero-voltage switching; based on topology, identifying current paths of the half bridges located at the top layer, the middle layer and the bottom layer in the soft switching transient process, and determining a mathematical relationship between the soft switching current of each layer of half bridge and the current of each resonant cavity; respectively establishing equivalent circuit models at switching moments for the top-layer half-bridge, the middle-layer half-bridge and the bottom-layer half-bridge, and solving to obtain each initial current value of the corresponding junction capacitor voltage at the switching moments; and substituting each initial current value obtained by solving into the established constraint condition, and drawing an operation parameter boundary of the topology capable of realizing soft switching in all working modes. According to the invention, by determining the operation boundaries of all half-bridge soft switches of the multi-resonant switched capacitor structure, the switching loss is reduced, and the operation efficiency is improved.

This invention provides a method for implementing complementary logic based on magnetic random access memory (MRM). The method includes: applying an initial voltage and an initial current to the control terminal of a first MLM and a common control terminal of a second MLM, causing the first and second units to be in a logically complementary initial magnetization state; applying a logic input voltage to the common control terminal and a logic input current to the first and second units, causing the first and second units to obtain corresponding first magnetization states based on their respective initial magnetization states, enabling the first unit to perform an AND logic operation; applying a logic inverse signal of the initial voltage to the control terminal of the first unit, applying a logic inverse signal of the logic input voltage to the common control terminal, and applying a logic inverse signal of the logic input current to the second unit, causing the second unit to obtain a second magnetization state based on its corresponding first magnetization state, enabling it to perform an XOR logic operation. This achieves integrated storage and computation.

The invention provides a control circuit and a control method for a pulse load power supply system, and the control circuit is used for being connected to a power supply main circuit comprising a pulse load, and specifically comprises a phase acquisition module, a signal conversion module, a linear expansion state observer, a voltage control loop, a current control loop, a signal inverse transformation module and a pulse width modulation module. The linear expansion state observer is used for observing load disturbance in real time and generating a load current feed-forward signal, the load current feed-forward signal and an initial current instruction output by the voltage control loop are synthesized in the first summator to form a compensated current instruction, and the compensated current instruction is transmitted to the current control loop; and finally converting into a switching signal for driving a converter in the power supply main circuit. The low-cost, high-performance and high-reliability suppression of the pulse load disturbance is realized.

The invention discloses a motor heating method and device, and a frequency converter. The method comprises the steps of determining an initial current instruction, and performing adjustment amplitude limiting and current compensation processing on the initial current instruction based on a voltage utilization rate to obtain a rotation current angular frequency and a compensation current instruction; a target axis given current instruction is determined based on the given heating power, and a target axis current instruction is obtained based on the target axis given current instruction and the compensation current instruction; acquiring a voltage vector compensation angle and a current vector angle based on the rotating current angular frequency, and acquiring a voltage vector angle based on the voltage vector compensation angle and the current vector angle; and inputting the target shaft current instruction and the voltage vector angle to a preset current controller, so that an inverter outputs high-frequency alternating current to a motor to heat the motor. The power control precision and the control robustness are improved, the dynamic control with a wider heating power range can be realized, and excessive computing resources are not needed.

This invention relates to an optimized charging method for rural power grid energy storage batteries based on their State of Charge (SOC), belonging to the field of battery optimization. Before charging the rural power grid energy storage batteries, the SOC estimation result of the battery is detected, and a suitable charging scheme is selected according to different battery states. The charging scheme includes: when SOC ≤ 10%, constant current charging is performed based on the acceptable initial current rate of the battery; when 10% < SOC ≤ 75%, a constant charging current is maintained, and a negative pulse charging method is used, specifically: charging is stopped before the negative pulse, discharging occurs during the negative pulse, and charging is stopped after the negative pulse; when 75% < SOC ≤ 90%, a MAS-pulse charging method is used; when SOC > 90%, a constant voltage trickle charging method with adaptive current adjustment is used. This method ensures charging efficiency, improves safety, extends battery life, and reduces costs.

A power circuit contains one or more power supplies controlled by a controller, a sensor, and a filter. Each power supply has an electrical component designed to store energy. The sensor detects an initial current with a first bandwidth through the electrical component. The filter filters a signal based on the initial current to obtain a filtered current with a second bandwidth smaller than the first. The controller is configured to process the filtered current to produce an estimated current with a third bandwidth larger than the second.

The application relates to a kind of detection method, device, system and storage medium of LED lamp bead, comprising the following steps, the electrode of the LED lamp bead is tested, and the initial current value of the LED lamp bead is obtained;Based on the initial current value, the LED lamp bead is applied to step voltage, and voltage-current curve is obtained;The LED lamp bead corresponding to the rated operating point in the voltage-current curve is detected by optical detector, and the light spot image is obtained;Based on the light spot image, the LED lamp bead is tested by reverse voltage, and the reverse leakage current value is obtained;Based on the voltage-current curve, light spot image and reverse leakage current value, the quality of the LED lamp bead is evaluated, and the quality evaluation result of the LED lamp bead is obtained, which solves the technical problem that the traditional detection method is mainly concentrated on simple on-off test or single parameter measurement, and it is difficult to comprehensively reflect the comprehensive performance of LED lamp bead.

A method for monitoring an electric vehicle charging apparatus is provided. A charging pile that includes a power meter and a processor is used to provide a charging current to an electric vehicle through a charging connector. The power meter detects the charging current to generate an initial current value and an initial power value that correspond to an initial charging time, and a present current value and a present power value that correspond to a present time, so that the processor calculates an initial resistance value and a present resistance value of the charging connector accordingly, and then calculates an estimated present temperature value of the charging connector based on the initial resistance value and the present resistance value. The estimated present temperature value is compared with an over-temperature threshold to determine whether to reduce the charging current.

The application relates to the field of optical communication power control, and discloses a multi-channel coupling light source power control method, equipment and a storage medium. The method comprises the following steps: a power control system sends an initial current signal to a current output source; the current output source outputs a current to a laser diode cluster based on the initial current signal; the laser diode cluster generates a light source electrical signal; an operational amplifier generates an amplified electrical signal; the power control system converts the amplified electrical signal into optical power; a target power is dynamically corrected to obtain a power dynamic threshold; it is judged whether the optical power is less than the power dynamic threshold; when the optical power is less than the power dynamic threshold, the initial current signal is increased to obtain an enhanced current signal; and the current output source adjusts the current output to the laser diode cluster based on the enhanced current signal. In the embodiment of the application, the dynamic threshold analyzes the optical power to adjust the output current, and the equipment can maintain high control precision and avoid crosstalk in different working states.

The application discloses a kind of resistance spot welding process parameter determination methods, comprising the following steps: S1, steel plate is cut into several samples, and sample is overlapped and placed in the middle of two electrode heads of resistance spot welding machine;S2, the determination of minimum initial welding current I vmin : under the condition that welding time and electrode pressure are certain, from initial welding current, gradually increase welding current and weld sample, measure the nugget diameter of sample;When nugget diameter first reaches minimum nugget size, the welding current corresponding to this time is minimum initial current I vmin ; The determination of maximum splash-free current I max : the current when splash is generated is used as initial welding current, and welding current is gradually increased or decreased, until at least 3 samples continuously without splash are generated under the same welding current, the welding current corresponding to this time is maximum splash-free current I max . The method is reasonable in parameter determination, reliable in welding quality, strong in operability and high in production efficiency.

A device includes a comparator circuit and a current generator circuit. The comparator circuit, responsive to a current, receives an input signal and a reference signal, compares the input signal with the reference signal, and generates an output signal that indicates the result of comparison. The current generator circuit includes a current mirror circuit and a current booster circuit. The current mirror circuit generates the current. The current booster circuit amplifies the current from an initial current value to a higher current value and maintains the current at the higher current value over a predetermined duration of time. A method for reducing a settling time of an output of the device is also disclosed.

The application discloses a motor testing method and a motor. The method comprises the following steps: in the process of operating a current loop of the motor based on an initial current control signal, if a current loop test instruction of the motor is received, the motor is controlled to be in a static state; after the motor is in the static state, the initial current control signal is adjusted based on a preset bias parameter to obtain a target current control signal; the current loop is operated based on the target current control signal, and a feedback signal of the current loop to the target current control signal is collected; and the current loop is tested based on the feedback signal to obtain a test result. The application solves the technical problem of low current loop test accuracy of the motor in the related art.

The invention discloses a motor control method and device, a motor, a storage medium and a computer program product, and the method comprises the steps: building a multi-type loss model of a driving system of the motor, and the multi-type loss model at least comprises copper loss, iron loss, switching loss and conduction loss; determining an initial current reference value of the motor based on a multi-type loss model; injecting a preset signal into the current loop, and performing online optimization on a current angle corresponding to the initial current reference value; and adopting a preset current prediction control strategy to adjust the optimized current so as to control the operation of the motor. According to the scheme, the global loss of the permanent magnet synchronous motor system is minimized, the high dynamic response capability of a current loop is improved, and the problem that high efficiency and high performance are difficult to consider in a complex working condition is solved.

The invention relates to the technical field of charging protection, and discloses a charging protection system based on a TypeC data line, comprising an interface connection and initialization module used for collecting an initial current reference value and loading a basic linear transformation matrix when user equipment is connected with host equipment, and an interface current monitoring module used for monitoring the initial current reference value and loading the basic linear transformation matrix when the user equipment is connected with the host equipment. The system comprises a charging current acquisition module for acquiring charging current in real time and calculating current fluctuation characteristics, a dynamic matrix disturbance encryption module for generating a disturbance matrix based on the current fluctuation characteristics and performing data encryption, and a security level evaluation and adaptive adjustment module for evaluating security risks of connection and dynamically adjusting encryption parameters. By monitoring the current fluctuation in real time and dynamically adjusting the encryption strategy, dual protection of charging and data transmission is achieved, compared with the prior art, the method does not depend on a fixed encryption mode, the encryption matrix is optimized according to the current change, the data transmission safety is improved, and risks caused by the current fluctuation are avoided.

The invention discloses an LED large screen power supply overload test method and device and a medium, and relates to the technical field. The method comprises the following steps: presetting a rated voltage, a rated current and an overload protection threshold value of a tested power supply; gradually increasing the initial current value at a preset rate until the initial current value exceeds an overload protection threshold value, collecting current and voltage data in real time in the rising process of the current value, recording the moment when the current reaches the overload protection threshold value as an overload triggering moment, and recording the moment when the voltage suddenly drops to zero as a protection starting moment; calculating the time difference between the overload triggering moment and the protection starting moment as the overload protection response time of the power supply system; and changing the temperature value of the test environment, obtaining overload protection response time, and evaluating the protection performance of the power supply system according to the overload protection response time. According to the method, various test scenes such as normal temperature, high and low temperature and dynamic jump are integrated, and comprehensive and systematic qualification judgment is made on the overload protection performance of the power supply system.

This invention relates to the field of transcranial alternating current waveform control technology, and discloses a method and system for controlling current waveforms based on transcranial alternating current stimulation. The method includes: performing time-frequency analysis of electroencephalogram (EEG) signals using short-time Fourier transform; generating an initial current waveform based on individual neural oscillation characteristics; selecting different stimulation modes to adjust the current waveform according to task requirements; and calculating and dynamically compensating for frequency and phase shifts through real-time feedback. Compared to existing stimulation methods that typically use fixed frequencies and amplitudes, especially under conditions of significant individual differences, it is difficult to achieve precise individualized current waveform control, leading to unstable and poor stimulation effects. This application, through real-time feedback and dynamic frequency, can precisely adjust the frequency and phase of the current waveform according to the actual neural oscillation state of the brain, improving the synchronization between stimulation and brain neural oscillations.

The invention relates to the technical field of electroslag remelting, in particular to a stable arcing method in an electroslag remelting process, which sequentially comprises the following stages: a) a pretreatment stage: preparing an arc striking slag agent; uniformly adding an arc striking slag agent into the bottom of the crystallizer; b) a pre-arcing stage: applying an initial current% to keep the distance between the lower end of the consumable electrode and the surface of the arc striking slag agent at 5-10mm, adding body slag into the crystallizer in batches, and meanwhile, lifting the consumable electrode to enable the temperature of the surface layer of a slag bath to reach 1200-1300 DEG C; c) a stable arcing stage: increasing the current to 70-80% of the rated remelting current in a stepped manner, and stabilizing the voltage of the slag bath at 80-150V; the length of the electric arc is maintained to be 15-20 mm; and d) a transition stage: increasing the current to a rated remelting current, slightly stirring, controlling the temperature of the slag bath to 1600-1800 DEG C, and converting into a normal electroslag remelting mode when the melting rate is greater than or equal to 95%. The method has the advantages of stable arcing, small thermal shock, shortening of the arcing time and improvement of the production efficiency.

The invention discloses a grid-connected inverter electric energy quality optimization control method for power grid voltage sag, which comprises the following steps: performing parameter preprocessing on a pre-established mathematical model of a grid-connected inverter to obtain preprocessing parameters under a two-phase static coordinate system; calculating a positive sequence voltage component and a negative sequence voltage component, and calculating an initial current reference instruction under various electric energy quality optimization modes according to an instantaneous power theory; performing dynamic correction and amplitude limiting on the initial current reference instruction based on the voltage drop depth and the low voltage ride through requirement, and generating a final current reference instruction for model prediction control; predicting a system state of a next sampling period based on the mathematical model and the preprocessing parameters, and constructing a value function by taking tracking of a final current reference instruction as a control target based on the system state; and solving an optimal inverter valve side voltage control quantity through the value function, and applying the control quantity to space vector modulation so as to drive the grid-connected inverter.