205 results about "Initial current" patented technology

The invention discloses a simulation method of a full-system coupled railway traction power supply system, which comprises the following steps: taking a traction power supply system and a train group as integrated simulation objects, and respectively constructing traction power supply network models including equivalent models of traction transformer, traction network, AT station and public power grid parameters; a multi-train operation simulator is constructed, and the multi-train operation simulator comprises various parameters such as trains, lines, signal systems, operation organizations and the like. Traversing all on-line trains through a multi-train operation simulator, substituting the on-line trains into a traction power supply network model, and dynamically calculating operation parameters and traction loads of a train group, including calculating locomotive initial current according to train initialization voltage, solving a traction power supply network node voltage equation and updating locomotive terminal voltage; and correcting the traction and braking characteristics of the train based on the updated locomotive terminal voltage. The method overcomes the defects of a traditional calculation method using a traction power supply system as an isolated network, reveals the dynamic state of train operation and the distribution characteristics of the traction network, and finally can obtain various parameters of each train.

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 a current measurement method and device, computer equipment, a storage medium and a program product. The method comprises the following steps: acquiring the magnetic field intensity of the two sides of a monitoring point at the current moment through a first magnetoresistive sensor and a second magnetoresistive sensor which are deployed on the two sides of the same monitoring point of a power transmission line to obtain first magnetic induction intensity and second magnetic induction intensity; wherein the first magnetoresistive sensor and the second magnetoresistive sensor are located in the same electromagnetic environment; according to the first magnetic induction intensity, the second magnetic induction intensity and the error coefficient of the first magnetoresistive sensor and the second magnetoresistive sensor, the initial current value of the monitoring point at the current moment is determined, and the influence of the hysteresis effect on the current value is eliminated; and Kalman filtering processing is carried out on the initial current value of the monitoring point at the current moment to obtain the target current value of the monitoring point at the current moment, so that the accuracy of the measured current value is further improved.

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.

The invention provides an ultrasonic transducer suitability judgment system based on transient monitoring, and belongs to the technical field of ultrasonic waves. The system comprises a data acquisition module used for acquiring key transient parameters and steady-state parameters of operation of the ultrasonic transducer; the dynamic threshold value calculation module is used for calculating an initial current threshold value based on the collected key transient parameters and steady state parameters in combination with preset weight coefficients corresponding to the parameters and a preset basic current threshold value; and the intelligent judgment and feedback module is used for comparing the collected working current with an initial current threshold value and determining the ultrasonic adaptation condition. According to the method, the energy consumption state of the transducer is directly reflected in real time through transient parameter judgment and the collected working current value, sudden load change can immediately cause current fluctuation, temperature accumulation does not need to be waited, millisecond-level response can be achieved, load abnormity can be early warned in advance, and equipment damage or machining failure caused by lagging judgment is avoided.

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.

The invention relates to the technical field of inverter control, and discloses a control method, device and equipment for improving the stability of a grid-connected inverter, and the method comprises the steps: obtaining a common coupling point voltage and an inversion inductive current of a power grid and the grid-connected inverter; obtaining an initial current closed-loop regulating variable according to the common coupling point voltage and the inversion inductive current; performing phase lead compensation on the initial current closed-loop regulation quantity and the partial power grid voltage feed-forward quantity to obtain a final current closed-loop regulation quantity; adding the final current closed-loop regulating quantity and the full feed-forward quantity of the power grid voltage to obtain a modulated wave signal; the grid-connected inverter is controlled to operate based on the modulated wave signal, the grid-connected inverter can stably operate under the condition of wider-range weak power grid impedance, and the stability of a grid-connected inverter system is improved.

The present invention discloses a control method, system, medical equipment and storage medium for light-emitting diodes, wherein a first temperature value and a first pressure difference value of a light-emitting diode are obtained, and a pre-stored first calibration data table is called for a first comparison based on the first temperature value and the first pressure difference value. After the first pressure difference value is calibrated based on the result of the first comparison, a second pressure difference value is obtained, and the first calibration data table is a statistical table of the initial temperature value and the initial voltage value of the light-emitting diode; a current value of the light-emitting diode is obtained, and a second comparison is called for a pre-stored second calibration data table based on the second pressure difference value and the current value. The second calibration data table is a statistical table of the initial pressure difference value and the initial current value of the light-emitting diode. If the result of the second comparison does not meet a preset threshold, an alarm message is sent, thereby solving the problem that the service life of a single LED lamp cannot be accurately predicted and realizing accurate prediction and alarm of the service life of a single LED lamp.

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.

The present invention relates to a method for producing a gas-tight plug connection between a terminal with at least one contact tab and a blade, in particular with a predetermined current carrying capacity greater than or equal to 100 A. The method comprises the steps of: pressing the blade into the terminal, wherein the contact tab digs into a surface of the blade to create a preliminary plug connection, and initial current supply to the preliminary plug connection to enlarge the contact area between the contact tab and the blade, wherein the electrical current of the initial current supply is greater than or equal to the predetermined current carrying capacity of the plug connection.

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 welding power supply system that automates the initial operation of submerged arc welding and suppresses the introduction of impurities into the weld bead after welding. The welding system (A1) for submerged arc welding includes: a welding power supply device (2) having an inverter circuit (25) and providing power; a wire feed device (5) for feeding welding wire; and a control device (1) for controlling the welding power supply device (2) and the wire feed device (5). The control device (1) feeds the welding wire in the forward direction via the wire feed device (5) at the start of welding. When the tip of the welding wire contacts the workpiece (W), the welding power supply device (2) outputs an initial current. From the contact of the welding wire until the start of forward feeding at a first welding speed, a second forward feeding speed slower than the first speed is provided as the initial current.

The present invention provides a chip operating current measurement system, comprising: a sampling resistor circuit including multiple sampling resistor branches; a voltage and current sampling module pre-configured with a sampling current threshold and having multiple amplifier gears; a current measurement module comprising: a storage unit for storing multiple sampling gears and a derivation array associated with each sampling gear; a gear optimization unit for selecting a sampling gear as an initial gear, controlling the voltage and current sampling module to collect an initial current at the initial gear, and selecting a sampling gear as an adaptive sampling gear; and a first control unit for controlling the voltage and current sampling module to collect an operating current at the adaptive sampling gear as an operating current measurement result. The beneficial effect is that the system selects an adaptive sampling gear based on the initial current collected at the sampling gear corresponding to the maximum current range and the derivation array, and calibrates the system through a calibration current coefficient, thereby making the operating current measurement result more accurate.

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.

The application discloses a kind of energy storage battery system parallel branch current estimation method, storage medium and equipment, belong to lithium ion battery technical field, including obtaining energy storage battery system actual operation condition under parallel battery pack each branch current value, total current value and voltage value;Establish the parallel branch state model of energy storage battery system;Calculate the initial bias of each branch;Build the current estimation model based on Kalman filtering;According to initial measurement value and initial current bias, Kalman filtering iteration estimation is carried out, and prediction and updating steps are executed at each time step, to realize the online real-time estimation of each branch current.The application can correct current measurement bias in real time without increasing hardware, filter out random noise, improve estimation accuracy and system reliability.

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 invention provides a charging pile load radiation disturbance background noise monitoring method, which comprises the steps of obtaining real-time current data and a magnetic flux density value in a magnetic core during operation of a charging pile, determining an initial current threshold value of the saturation degree of the magnetic core, and calculating a deviation value between the magnetic flux density and a preset saturation threshold value to obtain a saturation deviation value; according to the saturation deviation value, identifying the magnetic field distribution intensity of the magnetic core under the current load by adopting a finite element analysis method, and judging the radiation suppression weakening degree to obtain a radiation weakening multiple; processing real-time waveform data of a ground noise signal generated by an internal circuit of the charging pile and detected and received by a magnetic core according to the radiation weakening multiple, and determining a trigger point of an electromagnetic unstable cycle; and adjusting a magnetic core configuration value according to the offset amplitude prediction value to recover radiation intensity control, identifying a real-time calibration bottom noise fluctuation level, and monitoring an attenuation effect of an electromagnetic unstable cycle in a calibration process to obtain an optimized compatibility performance value.

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.