356 results about "Initial current" patented technology

A system includes a catheter including an elongated carrier, a balloon about the carrier in sealed relation thereto, the balloon being arranged to receive a fluid therein that inflates the balloon, and first and second electrodes within the balloon arranged to carry a voltage there-across including an initial high electrical voltage at an initial low current. The initial high electrical voltage causes an electrical arc to form across the first and second electrodes within the balloon. The electrical arc causes a gas bubble within the liquid, a high current to flow through the first and second electrodes, a decrease in the initial high electrical voltage, and a mechanical shock wave within the balloon. The system further includes a power source that provides the first and second electrodes with a drive voltage that creates the initial high electrical voltage at the initial current and that terminates the drive voltage in response to the decrease in the initial high electrical voltage.

The invention relates to the technical field of electrical performance detection, in particular to a household appliance wire harness electrical performance detection method and system. The method comprises the following steps: acquiring initial current and voltage data of a wire harness by using a sensor to obtain original electrical parameter matrix data; performing resistance modeling according to the original electrical parameter matrix data to obtain a resistance dynamic model; performing resistance characteristic analysis according to the resistance dynamic model to obtain resistance characteristic analysis data; and according to the resistance characteristic analysis data, carrying out resistance compliance determination to obtain compliance matrix data so as to carry out household appliance wire harness electrical performance detection auxiliary operation. The electrical performance of the household appliance wire harness is comprehensively detected and accurately evaluated, high technical innovation and practical application value are shown, and the crossing from simple static detection to intelligent dynamic analysis is achieved.

The invention discloses a traveling wave fault positioning method and system for a full parallel AT power supply traction network, and belongs to the field of railway traction power supply system relay protection. The method specifically comprises the following steps: after the full parallel AT power supply traction network has a fault, firstly, analyzing the characteristics of an AT station fault initial current traveling wave, and determining a fault line by using the amplitude of the AT station fault initial current traveling wave; then, the polarity of the fault initial current traveling wave and the fault initial voltage traveling wave of the AT station fault line is used for judging the fault direction; and finally, calculating the fault distance by selecting a positive direction or negative direction distance measurement formula according to the moment when the fault initial voltage traveling wave arrives at the outlet of the traction substation, the AT station and the subarea station and the fault direction information. According to the method, only fault initial traveling wave information is utilized, wave head identification is not needed, wave velocity parameters are not needed, and simulation results show that the positioning method not only can provide fault distance, but also can provide fault line information, is convenient for maintainers to quickly find fault points, and has extremely high robustness and accuracy.

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 a lithium ion battery charge state estimation method and system. The method comprises the following steps: acquiring initial current, initial voltage and temperature data of a battery under different working conditions; inputting the initial voltage and the initial current data into a mechanism model to obtain voltage simulation data and current simulation data; inputting the voltage simulation data, the current simulation data and the temperature data into a neural network for training, constructing an SOC estimation model, and obtaining an SOC output result; and according to the SOC output result and the SOC true value, respectively calculating a root mean square error RMSE and a mean absolute error MAE for verification and testing so as to evaluate the estimation performance of the SOC estimation model. According to the method, the calculation speed of the SOC estimation process of the battery is high, the relative precision is high, a solid foundation is provided for a battery management system to guarantee safe and reliable operation of a battery power supply system, and the applicability of the SOC estimation model under different operation conditions and temperatures is improved.

Automated operation methods and systems are provided for power machines. One system includes implementing ride control for an electric power machine. The system may include an electronic processor configured to determine a target lift position and an initial electric current for holding a load at the target lift position. The electronic processor may also be configured to determine, based on a positional deviation of the load from the target lift position, an updated electric current for returning the load to the target lift position. The electronic processor may also be configured to control an electric lift actuator to return the load to the target lift position using the updated electric current.

The invention provides a multi-wavelength frequency comb laser working point screening method. The method comprises the following steps: S1, setting a starting current, a current interval, a termination current, a starting voltage, a voltage interval and a termination voltage according to threshold current performance parameters and use requirements of a to-be-screened multi-wavelength frequency comb laser; and S2, according to the initial current, the current interval, the termination current, the initial voltage, the voltage interval and the termination voltage set in the step S1, controlling a current source and a voltage source to output current and voltage to the multi-wavelength frequency comb laser to be screened for multiple times according to the current interval and the voltage interval, acquiring output spectral information of the multi-wavelength frequency comb laser under each current and voltage condition by adopting a spectrograph; s3, automatically analyzing the number of the optical frequency combs in each piece of spectral information through a computer by adopting a preset spectral analysis method, and summarizing the numbers of the optical frequency combs of all the spectral information to make a working point diagram; and S4, current and voltage corresponding to the point with the maximum number of optical frequency combs in the working point diagram are selected as working points.

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 invention relates to a current automatic balance control method, a fault control method and a system, and the method comprises the steps: obtaining the maximum output power of each power supply and the maximum voltage allowed by a load, and setting an initial current given value of each power supply; calculating a threshold voltage and a voltage regulation width of each power supply; electrifying the equipment, and obtaining the real-time voltage of each power supply; establishing a current automatic equalization model for each power supply, and obtaining a current given value of each power supply; and adjusting the current output of each power supply to the respective obtained current given value and outputting the current given value. According to the invention, each power supply is of an independent working structure, a balance control algorithm is arranged in each power supply, the current and voltage data of each power supply are acquired, the current given value is calculated to realize the current balance effect among the power supplies, a master-slave mode does not need to be set, a third-party detection circuit does not need to be used for coordinated control, the use cost is effectively reduced, and the working efficiency is improved. The method can be applied to any load, is wide in application range, and improves the use compatibility.

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.

A method of controlling a secondary drivetrain of an electrically powered vehicle includes receiving a connect request for a disconnect mechanism, which includes a first and second clutch member. The second clutch member is biased to a disconnected state from the first clutch member and axially moveable into a connected state to transfer torque from an electric motor to the wheels. An initial current is applied to an actuator of the second clutch member, but the initial current does not overcome the bias on the second clutch member. The electric motor rotates the first clutch member such that a speed difference relative to the second clutch member is reduced below a threshold level. The method applies an additional current to the actuator, which overcomes the bias and connects the clutch members to transfer torque. The time to connect the clutch members is reduced because the initial current was already applied.

The invention discloses a motor temperature control method, system and device, and relates to the technical field of digital signal processing, and the method comprises the steps: receiving a cooling liquid request signal; the current temperature of the motor, the working state of the motor, the outflow temperature of cooling liquid and the target temperature of the motor are obtained, the flow of the cooling liquid is obtained based on the first calculation model, and the target valve opening degree is obtained based on the second calculation model; obtaining an initial current conversion coefficient, and obtaining first power driving operation time based on the prediction model; driving the operation time according to the first power to generate current for controlling opening of a plurality of electromagnetic valves, and acquiring actual valve opening degrees of the electromagnetic valves; obtaining an opening difference value, obtaining a correction index, correcting the initial current conversion coefficient according to the correction index, and generating a corrected current conversion coefficient; second power driving operation time is obtained based on the prediction model, and current for controlling the electromagnetic valve to be opened is generated according to the second power driving operation time. The method has the advantages of accurate control, stability, reliability and continuous correction and optimization.

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 discloses a configuration method and device of a water pipe insulation joint, a medium and terminal equipment. The method comprises the following steps: calculating axial resistance between adjacent insulating joints; constructing an equivalent T-shaped circuit based on the resistor and a human body contact water pipe circuit; calculating an initial contact current through the circuit; verifying the initial current by using a ground screen model to obtain a final contact current value; optimizing the configuration of the insulated joints according to the final current value, and determining the number and positions of the insulated joints; and finally, installing an insulating joint at a corresponding position on the water pipe. According to the method, the safety of water pipe electric shock in an electric power system is improved, meanwhile, cost and construction efficiency are optimized, and the problem that in the prior art, it is difficult to configure water pipe insulation joints at proper positions and in proper number is solved.

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 invention discloses a battery full charge judgment method and device, electronic equipment and a storage medium, and belongs to the technical field of external energy supply of an energy storage system.The method comprises the steps that the real-time temperature of a battery in the charging process is obtained; if the real-time temperature is larger than or equal to the first temperature threshold value, the full charge current of the battery is adjusted from the initial current to the first current, full charge judgment is carried out on the battery based on the first current, and the first current is larger than the initial current; and if the real-time temperature is less than the first temperature threshold, performing full charge judgment on the battery based on the initial current. According to the invention, the full charge judgment method of the battery can be improved, so that the overall charge capacity of the battery is reduced in a high-temperature scene, and the battery is prevented from being charged too much.

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 invention discloses a transformer current rising experiment method, which comprises the following steps of forming an experiment transformer through parallel compensation of a capacitor and a transformer, and providing capacitor current response for the experiment transformer by using the capacitor; constructing an equivalent inductance model and an equivalent capacitance model; applying an initial current response according to a rated current response of the transformer, calculating a capacitor current response, and adding a nonlinear element to obtain a nonlinear voltage response; updating the capacitor current response based on the nonlinear voltage response to obtain an updated capacitor current response; under the condition of considering the temperature effect, updating the updated capacitor current response again based on an equivalent inductance model to obtain a final capacitor current response; performing asynchronous frequency modulation, and updating the voltage response to obtain an updated voltage response; and calculating an experiment result based on the updated voltage response. The device is suitable for the transformer current rising experiment.