284 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.

This application relates to the field of biomedical technologies, and provides a data processing method and related devices. The method includes: collecting first data and second data from a patch clamp electrophysiological system, where the first data is data generated after a configured carbon fiber electrode applies multiple scanning voltages to a cell, and the second data is data generated after a configured stimulating electrode applies an electrical stimulation to the cell and then the configured carbon fiber electrode applies multiple scanning voltages to the cell; extracting target current data from the first data, and generating a first curve based on the target current data and the second data; sampling a single scanning voltage to obtain target sampling points, and generating a corresponding second curve based on the initial current data and the sampling time of the multiple target sampling points in the sampled first data or the sampled second data, so as to be able to obtain the original current and voltage data and convert the original data into an intuitive and effective curve.

The utility model provides power supply equipment and load equipment with leakage current compensation, each of which comprises a leakage current compensation circuit, the leakage current compensation circuit is arranged at an output port of the power supply equipment or an input port of the load equipment, and the leakage current compensation circuit comprises a current acquisition module, a voltage acquisition module, a current compensation module and a current acquisition processing module, wherein the current acquisition module and the voltage acquisition module are respectively used for acquiring an initial current signal and an initial voltage signal of an output port of a power supply device or an input port of a load device, the current compensation module is used for receiving and compensating an initial current value according to the initial current signal and the initial voltage signal, generating a compensated current acquisition signal, and outputting the compensated current acquisition signal to the power supply device. And the current collection processing module generates a current control signal for controlling the magnitude of the output current of the power supply equipment or the input current of the load equipment according to the preset current value of the power supply equipment or the load equipment and the compensated current collection signal, so that accurate compensation, collection and control of the current value output by the power supply equipment or the input current of the load equipment are realized.

The invention discloses a dual three-phase permanent magnet synchronous motor maximum torque current ratio control method and system based on virtual signal injection, and the method comprises the steps: injecting a bipolar square wave signal into a current vector angle, and calculating the d-q axis current after the bipolar square wave signal is injected through the current vector angle of the bipolar square wave signal; the d-q axis current after the bipolar square wave signal is injected is substituted into the corrected torque equation, the positive polarity torque Tup and the negative polarity torque Tdown of the dual three-phase permanent magnet synchronous motor are calculated and are expanded according to the Taylor series, when the difference between the Tup and the Tdown expanded according to the Taylor series is equal to 0, the difference between the Tup and the Tdown passes through a PI controller and then is superposed with an initial current vector angle beta, and the initial current vector angle beta is obtained. And obtaining a current optimal current vector angle, and calculating a d-q axis reference current required by the dual three-phase permanent magnet synchronous motor. According to the invention, accurate control of the maximum torque current ratio is realized.

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 driving method and system for an adjustable light source LED, and the method comprises the steps: collecting the input voltage and target brightness of a light source in real time, and calculating an initial current set value of the light source; dynamically switching a constant-current dimming strategy and a linear dimming strategy according to the dimming threshold frequency of the light source; feeding back the real-time temperature of the light source through a temperature sensor, and performing temperature compensation on the driving current of the light source to obtain compensation current; determining the driving voltage of the light source by combining the light source forward voltage and the compensation current; and the duty ratio is adjusted in real time based on PID closed-loop control to obtain a real-time duty ratio, and the light source matching target brightness is adjusted based on the real-time duty ratio and the driving voltage. According to the invention, the accuracy and reliability of LED light source adjustment can be improved.

The invention relates to the field of intelligent medical treatment, in particular to an electrical impedance imaging method and device based on mixed excitation and a program product. Comprising the steps that an initial current vector and an initial boundary voltage vector of mixed excitation are obtained, the mixed excitation comprises L kinds of excitation, and L is a natural number larger than 1; performing weighted fusion on the L excitation initial current vectors to obtain a mixed excitation current vector, and performing weighted fusion on the L excitation initial boundary voltages to obtain a mixed excitation voltage; performing electrical impedance imaging optimization function calculation based on the mixed excitation current vector and the mixed excitation voltage to obtain conductivity change; the optimization function is used for carrying out regularization calculation on regional potential distribution and conductivity variation based on the mixed excitation current vector and the mixed excitation voltage; an electrical impedance distribution image is generated based on the conductivity change. According to the invention, the resolution of EIT imaging is improved, and the method has good clinical value.

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 silencer machining, in particular to a production and machining control system and method for an air conditioner silencer, and the method comprises the steps: obtaining an equivalent gap of a joint region, and determining whether the joint gap of a welding region is in a standard interval or not; when the joint gap is in the standard interval, the critical stress of the joint area is estimated according to the joint gap of the welding area and the linear expansion coefficient of the assembly material, and the risk level of the copper pipe in the joint area during high-frequency brazing is determined; when the copper pipe in the joint area is at the first risk level, the welding mode of high-frequency brazing is determined according to the critical stress; after the welding mode of brazing is determined, the welding stage where a weld joint is located is determined according to the temperature rising speed, and a corresponding brazing strategy is adopted; the current fluctuation of the induction coil is detected in the high-frequency brazing process, and the initial current frequency is adjusted back according to the fluctuation duration. The dissimilar metal welding defect rate is reduced by adjusting the welding mode and the brazing strategy of high-frequency brazing.

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 relates to a magnetic attraction state detection method and device, computer equipment, a computer readable storage medium and a computer program product. The method comprises the steps that under the condition that a power-on signal for an electromagnet in a magnetic attraction device is obtained, the initial current of the electromagnet when the electromagnet is not powered on is determined; electrifying the electromagnet according to the electrifying signal; if the power-on duration of the electromagnet reaches the preset duration, electromagnet current of the electromagnet is acquired; and determining that the magnetic attraction device is in an attraction state under the condition that the current of the electromagnet meets the attraction condition. By adopting the method, the detection cost can be reduced.

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 invention discloses a design method and system of an array antenna, and relates to the technical field of computer aided design. According to the design method of the array antenna, a test angle, the number of antenna units in the array antenna, an initial current intensity value and an initial phase value of each antenna unit, and an antenna spacing value and an antenna working frequency value of each group of adjacent antenna units are acquired, array analysis and gain analysis are performed, and whether gain is in a preset interval is judged; and if the gain of all the test angles does not meet the preset interval requirement, adjusting the current intensity and the phase value, and repeatedly analyzing and judging until the gains of all the test angles meet the preset interval requirement. According to the method, the gain is ensured to meet the preset interval requirement in all test angles, so that the consistency of the multi-angle gain is improved, the calculation complexity of the optimization process is effectively reduced, and the design efficiency is remarkably improved.

The invention belongs to the technical field of converter fault diagnosis, and particularly relates to a converter power device open circuit fault diagnosis method based on fundamental frequency current characteristics. Converter operation state information needing to be collected is preset; under a rated working condition, testing to obtain an initial value of a converter operation state, and calculating to obtain an initial current component characteristic value; when the converter is in a running state, testing to obtain the running state of the converter, and calculating to obtain a current component characteristic value in the running state as a fault characteristic value; based on the initial current component characteristic value and the fault characteristic value, the variable quantity of the current fundamental frequency amplitude is obtained through calculation; performing steady-state processing on the variable quantity of the current fundamental frequency amplitude to obtain a current parameter abnormal degree; based on the variable quantity of the current fundamental frequency amplitude and the abnormal degree of the current parameter, the specific position of the open circuit fault of the converter is judged, and field troubleshooting and intelligent monitoring are assisted.

The present invention belongs to the technical field of network-forming converters, and particularly relates to a method, system, device, and medium for determining the overcurrent capacity of network-forming converters. Aiming at the deficiencies of the existing method for calculating the current limit value corresponding to the critical clearing time of network-forming converters, which has a large amount of calculation, long time consumption, or cannot obtain the calculation result, the present invention adopts the following technical solutions: A method for determining the overcurrent capacity of network-forming converters considering transient synchronous stability, including: establishing a reduced-order simplified model of the network-forming converter under short-circuit faults; obtaining the electromagnetic power curves under steady state, during transient faults, and after fault clearing; obtaining the mechanical power curve considering damping power consumption; calculating the fault critical clearing angle and critical clearing time under the initial current limit and determining whether the requirements are met; increasing the current limit value until the calculated fault critical clearing time is greater than the actual fault clearing time. The beneficial effect of the present invention is: quickly and accurately obtaining the required minimum current limit value.

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 embodiment of the utility model provides a reference signal generating circuit, a chip and electronic equipment, the reference signal generating circuit comprises an operational amplifier module, a mirror image module and a reference signal adjusting module, a current adjusting unit is connected with a voltage feedback unit in parallel, so that the voltage at the two ends of the current adjusting unit is equal to the voltage at the two ends of the voltage feedback unit; therefore, under the condition that the feedback voltage and the reference voltage output by the voltage feedback unit are not changed, the initial current can be adjusted through the current adjusting unit, and then all the reference currents can be synchronously calibrated, so that the reference voltage or the reference current can be independently adjusted; and the calibration efficiency of the reference current is improved.

The present application relates to a compressor control method, apparatus and device, and a storage medium. In the present application, a rotational speed error of a compressor during operation and a torque error corresponding to the rotational speed error are obtained, then a current compensation amount corresponding to the torque error is calculated by means of a preset current compensation model, and a current loop of the compressor is compensated on the basis of the current compensation amount and an initial current corresponding to a preset velocity loop instruction.

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 discloses an electric parameter calculation method of an electric meter, a control device and a computer readable storage medium, and the method comprises the steps: filtering an initial voltage sampling sequence through employing a low-pass filter before calculating a zero crossing point of a cyclic wave sampling point number, filtering the interference of harmonic waves and noise on the zero crossing point, and calculating the zero crossing point of the cyclic wave sampling point number; finding a zero crossing point according to the filtered intermediate voltage sequence so as to determine the number of cycle sampling points; continuously taking data from zero crossing points of the initial voltage sampling sequence and the initial current sampling sequence according to the number of cycle sampling points so as to calculate a voltage effective value and a current effective value; and performing interpolation resampling processing on the initial voltage sampling sequence and the initial current sampling sequence according to the number of cyclic wave sampling points and a second resampling frequency, and calculating harmonic electric parameters of the voltage signal and the current signal according to the obtained voltage resampling sequence and the current resampling sequence. The electric parameter calculation accuracy of the measured signal when the higher harmonic content is relatively high can be effectively improved.

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.