56 results about "Total current" patented technology

This invention proposes a simulation method and system for the current response of distribution networks based on multi-frequency coupling effects, belonging to the field of power system modeling and simulation technology. The method includes: obtaining the frequency domain admittance matrix of the distribution network; extracting the same-frequency admittance vector and coupled admittance vector; converting each admittance vector into a transfer function, and then converting the transfer function into a discrete state-space model; preprocessing the voltage input signal using dq transform to reconstruct components at specified frequencies; substituting the preprocessed voltage signal into the discrete state-space model to obtain the current response of each frequency component; solving for the optimal weighting coefficients using an adaptive weighting strategy, and linearly superimposing the current responses to obtain the real-time simulated total current response.

Methods and electric circuit arrangements for protecting metallic components in an electrolytic medium from corrosion due to direct-current (DC) stray current (Is) from a power supply system. The DC stray current may be jointly registered as a total sum current across all active conductors together with the protective conductor of the power supply system by a DC total differential-current sensor. Alternatively, a combined DC differential-current sensor is switchable by a switching device, a differential current being registered across all active conductors or the DC stray current being registered as a total differential current across all active conductors and the protective conductor. Alternatively, a differential current may be registered across all active conductors by a DC current sensor at the protective conductor and the DC stray current computed by forming differences of the differential current registered by the differential-current transformer and of the protective conductor registered by the DC current sensor.

This invention relates to the field of power management and anomaly detection technology, specifically to a method and system for detecting anomalies in multi-port charging power supplies based on current analysis. It is applied to a charging system containing multiple load power supply buses and several branch switching transistors. The method includes: extracting and sampling AC ripple current from the total current signal of the multiple load power supply buses and each branch; performing delay mapping on the AC ripple current to construct a multi-dimensional phase space matrix and calculate a Poincaré cross-section scatter plot; calculating the current topological information entropy based on the scatter distribution probability and comparing it with the baseline information entropy to generate an information entropy residual; comparing the information entropy residual with a safety manifold boundary threshold range, determining a charging anomaly when it exceeds the threshold, outputting a hardware interrupt signal to control the state of the corresponding branch switching transistor, and generating a diagnostic report containing physical feature parameters extracted based on the multi-dimensional phase space matrix. This invention enables early identification of anomalies in multi-port charging systems and rapid hardware-level response.

The invention discloses a virtual synchronous generator control method for improving power transmission capability, which is characterized in that the traditional virtual synchronous generator control is composed of a power outer loop and an inner loop formed by voltage and current double closed loops. A reference voltage generated by a power outer loop subtracts a grid-connected point voltage and then is input into a current feed-forward compensation calculation module to generate a current feed-forward compensation value, the current feed-forward compensation value is superposed on a current given value output by a voltage controller, and the superposed value is used as a total current given value of a current controller. Compared with traditional virtual synchronous generator control, the method has the wide-range adaptive capacity of power grid impedance, and the limit power transmission capacity of active power of a grid-connected inverter can be remarkably improved.

The utility model discloses a large-current inverter inductor which comprises a circuit board, a first protective cover and a second protective cover are fixed to the top end of the circuit board, and a first magnetic core assembly and a second magnetic core assembly are installed in the first protective cover and the second protective cover respectively. The surface of the first magnetic core assembly is respectively connected with a first pin and a second pin, the surface of the second magnetic core assembly is respectively connected with a third pin and a fourth pin, and windings are wound on the surfaces of the first magnetic core assembly and the second magnetic core assembly. According to the utility model, the two groups of inductors are connected in parallel to share current, the total current bearing capacity is improved, and the temperature rise of a single inductor is reduced, so that a photovoltaic energy storage system or an industrial large-current scene can be met, the system reliability can be improved, and partial power transmission can still be maintained when a single inductor fails.

The utility model discloses a series power supply formula low -power consumption television receiving antenna signal amplifier circuit, including UHF signal input terminal anti -static and strong pulse circuit (1), UHF channel filter circuit (2), first -stage UHF channel amplification unit (3), second -stage UHF channel amplification unit (4). Further including amplifier UHF and VHF channel hybrid output circuit (11), VHF signal input terminal anti -static and strong pulse circuit (8), VHF channel filter circuit (9), power supply input rectifier filter circuit (6), voltage stabilizing and decoupling circuit (5), decoupling voltage division's front -stage series power supply circuit (7) and VHF amplification unit (10). Or including RF signal input channel filter circuit (13), first -stage RF channel amplification unit (14), second -stage RF amplification unit (15) and decoupling voltage division's front -stage series power supply circuit (7). The utility model discloses through series power supply mode, make the total current of amplifier equal the current of second -stage amplification unit, relative parallel type circuit saves nearly 50% power consumption, reduces the requirement to transformer power, thereby reduces the cost.

A non-intrusive load identification method employs a non-intrusive detection device to detect a total current on the main power line (i.e., power entrance) of a power system to identify the types of primary loads. The non-intrusive load identification method obtains a turned-on time interval when the present load of the primary loads is turned on or a turned-off time interval when the present load of the primary loads is turned off, obtains a transient turned-on current or a transient turned-off current based on the turned-on time interval or the turned-off time interval, and converts the transient turned-on current or the transient turned-off current into the present power feature of the present load, thereby identifying the type of the present load.

This invention relates to the field of power equipment insulation condition monitoring technology, and discloses a multi-source intelligent fault judgment method for compact ring main units (ECT) and electronic current transformers (EVTs). The method includes: simultaneously acquiring transient voltage and current data of the electronic current transformer in response to a voltage step event triggered by the closing action of the grounding switch; selecting short-time window data at the moment of the step, calculating the ratio of accumulated charge to voltage drop amplitude based on the principle of charge conservation, and calibrating the parasitic capacitance parameters of the equipment; constructing a capacitive displacement component using the parasitic capacitance parameters and voltage change rate, and decoupling it from the total current to reconstruct the dielectric response current reflecting the polarization process of the insulation material; performing multi-timescale decay trend analysis on the dielectric response current to identify the mechanism switching moment, and generating diagnostic results for insulation dampness or interface degradation accordingly. This invention can effectively suppress structural capacitance interference and achieve low-cost, high-precision insulation condition assessment.

The application discloses a line ice melting method, device, apparatus and nonvolatile storage medium. The method comprises the following steps: acquiring three-phase voltages and a line total current on both sides of an access point in a power distribution network, wherein the access point is an access point of a line ice melting device and a two-phase operation line in the power distribution network; calculating inter-phase loop voltages based on the three-phase voltages; calculating an initial impedance module value corresponding to an adjustable RC load device in the line ice melting device based on a preset target ice melting current value, the line total current and the inter-phase loop voltages; and generating a loop current based on the initial impedance module value, wherein the loop current is used for ice melting of the two-phase operation line in the power distribution network. The application solves the technical problem that the power distribution network cannot autonomously generate a large current sufficient for ice melting in an operation state, current thermal ice melting needs to interrupt power transmission, and an additional AC-DC power supply is needed for thermal ice melting, thereby affecting normal operation of the power distribution network and response lag.

A conductor arrangement for a motor vehicle (10) for conducting electrical energy from a primary power distributor (14a, 14b) to a remote secondary power distributor (18), to which at least one electrical consumer (16, 17) can be connected, is characterized in that a splitter unit (19) is arranged on the primary power distributor (14a, 14b), and this is connected to the secondary power distributor (18) via at least two spatially separated conductor strands (20a, 20b, 20c) for dividing the total current, wherein a maximum strand current (IMax1, IMax2, IMax3) is stored for each conductor strand (20a, 20b, 20c) at which the limits of electromagnetic compatibility with the environment (EMC limits) are complied with, wherein furthermore the splitter unit (19) for each conductor strand (20a, 20b, 20c) a current measuring device (24a, 24b, 24c) and a series resistor adjusting device (26a, 26b,26c) includes the setting of a series resistor, and the series resistor in each conductor string (20a, 20b, 20c) is adjustable so that the respective maximum string current (IMax1, IMax2, IMax3) is not exceeded. This reduces the electromagnetic fields. By adjusting the conductor resistance in each conductor string, the EMC limits can be met without restricting passenger comfort functions.

The application relates to a flat wire stator with multi-parallel winding, comprising a stator core and a flat wire winding, the stator core has a plurality of stator slots, the number of layers of the flat wire winding in the stator slots is ten, and the flat wire winding comprises a three-phase winding; the three-phase winding is three groups of parallel winding lines, each group of winding lines is five parallel branches, and each branch comprises a plurality of PIN wire conductors arranged in the stator slots and connected in series with each other. After the winding is divided into ten layers, the thickness direction size of each layer of conductors is relatively small, the increase of high-frequency alternating current resistance can be obviously inhibited, and the design of five parallel branches per phase makes the total current be uniformly shunted to the five branches, and the current borne by each branch is only 1 / 5 of the total current. This reduces the current stress of each PIN wire conductor, allows the use of a smaller cross-sectional area of the conductor, reduces the Joule heat concentration in the branch, and improves the motor temperature rise.

A precharge device for DC loads comprising a switching element, a magnetic core with negatively coupled coils being switchably connected by the switching element. Moreover, the precharge device comprises capacitors with parallel diodes between the coils and ground with the forward directions pointing away from ground. In addition, the precharge device comprises a control for turning the switching element on if a total current through the coils or the absolute value of the total current drops below a first threshold value and for turning it off if it rises above a higher second threshold value. The invention also relates to an arrangement with such a precharge device a DC-grid connected to the precharge device and a load capacitor connected to the precharge device.

The application discloses a sensor multiplexing current tracking control method and device and related equipment, and the method comprises the following steps: acquiring a reference current output by a measured transformer, and collecting total inductance currents of n-phase interleaved transformers; the total inductance current is the sum of all inductance currents corresponding to n parallel half-bridge circuits; calculating a total current error between the total inductance current and the reference current; for each phase in the n phases, based on the total current error and the actual sampling value of the inductance current, a coupling reference value corresponding to the inductance current of each phase is generated; according to the coupling reference value, the duty cycle of the lower switch in each phase half-bridge circuit is calculated; based on the duty cycle calculated for each phase, the on-off state of the upper switch and the lower switch of the corresponding phase half-bridge circuit is controlled respectively, so that the total inductance current tracks the reference current. By introducing the coupling reference value based on the total current error, the current tracking speed and accuracy of the multi-phase interleaved transformer are improved.

The application relates to a battery model parameter identification method and device and an engineering vehicle, and relates to the technical field of batteries. The battery model parameter identification method comprises the following steps: obtaining a corresponding relationship between a state of charge of a battery and an open-circuit voltage of the battery under a preset working condition; obtaining a target relationship formula according to a preset battery equivalent circuit model; obtaining total current and terminal voltage in the preset battery equivalent circuit model in different test periods by running the preset battery equivalent circuit model; and obtaining target parameters in the preset battery equivalent circuit model under different states of charge according to the corresponding relationship between the state of charge and the open-circuit voltage, the target relationship formula, the total current in the multiple test periods and the terminal voltage in the multiple test periods. The battery model parameter identification method, device and engineering vehicle can obtain more accurate parameters, thereby improving the accuracy of the battery equivalent circuit model.

This invention discloses a current sharing control method, system, and power supply device for a power module. The method includes: acquiring the total current parameters of the power module and the branch current parameters of the voltage conversion branches; determining a first proportional adjustment parameter for the total current loop and a second proportional adjustment parameter for the branch current loop based on the total current parameters and the branch current parameters; determining the switching control parameters of any voltage conversion branch based on the first and second proportional adjustment parameters, wherein the sum of the fluctuations of the switching control parameters is equal to zero; and adjusting the branch current of the voltage conversion branch according to the switching control parameters. This invention achieves bidirectional current regulation by setting up a total current loop and branch current loops, thereby decoupling multiple parallel voltage conversion branches, improving the fault tolerance performance of current sharing control and the dynamic response speed of the system, and enhancing the current sharing effect.

The invention belongs to the technical field of iron core grounding current monitoring of transformers, and particularly relates to an iron core grounding current recording method based on precise time synchronization. Comprising the following steps: collecting a current signal through an iron core and a clamp grounding current sensor; time deviation caused by RTC is calibrated continuously in the collection process; performing cyclic sampling and calculation on an output signal of the sensor, sending total current and multiple harmonic waves obtained by Fourier calculation to a display end of an upper computer, and starting fault recording when the value of the total current meets a fault judgment threshold value; when it is judged that a fault occurs, an accurate time mark is provided through an accurate time synchronization function, reserved historical data and collected real-time data are spliced into a wave recording graph during the fault period, and the wave recording graph is backed up and transmitted to a display end of an upper computer to be stored and displayed. According to the invention, some fault phenomena which are short in duration and rapid in generation and disappearance can be effectively monitored, and the change trend of iron core and clamp current when faults occur can be effectively monitored.

This invention provides a DC-DC control method for new energy locomotives, comprising: acquiring the input current signals of each DC-DC converter unit, the SOC value of each power battery, and the output bus voltage acquisition value; constructing a dual closed-loop control structure of voltage outer loop and current inner loop; wherein, the voltage outer loop takes the deviation between the preset target value of the bus voltage and the acquisition value as input, and generates a total current command through an active disturbance rejection controller (ADRC); determines the target value of each current inner loop based on each SOC value and the total current command, so that the SOC of each battery tends to be consistent; the current inner loop takes the deviation between the target value of the current inner loop and the corresponding input current acquisition value as input, and generates a modulation wave signal through a PI regulator; performs amplitude limiting processing on the modulation wave signal; compares the amplitude-limited modulation wave signal with a triangular carrier wave to generate a drive pulse, and controls the operation of the power switch.

The embodiment of the present specification provides a power amplifier load impedance dynamic estimation method and system, the method comprises: determining the load estimation of at least one channel based on the channel signals of multiple channels at multiple sampling times, the load estimation of the channel and the load relationship of the total current of multiple channels. The system comprises: a processing module for processing the input audio signal, determining the channel signals of multiple channels and outputting to the amplification module; the amplification module is used for amplifying the channel signals of multiple channels and outputting to the load, and the amplification module comprises a current sensing unit, the current sensing unit is used for detecting the total current of multiple channels, and the total current is provided to the processing module; the processing module is also used for determining the load estimation of at least one channel based on the channel signals of multiple channels at multiple sampling times, the load estimation of the channel and the load relationship of the total current of multiple channels.

This application relates to a method for diagnosing internal short-circuit faults in batteries, a computer device, a computer-readable storage medium, and a computer program product. Applied to a battery management system, the system operates on an equivalent circuit model of the target battery. The system includes a data acquisition module and an active balancing circuit. The data acquisition module monitors the individual cell voltages and total currents of multiple cells in the target battery in real time. The method includes: repeatedly switching the operating mode of the target battery and acquiring the individual cell voltages and total currents of multiple cells at the moment of mode switching; correcting the ohmic internal resistance parameter of the target battery in the equivalent circuit model based on the individual cell voltages and total currents; after correcting the ohmic internal resistance parameter, if the active balancing circuit is activated, continuously acquiring the cumulative balancing time of multiple cells; and determining whether a faulty individual cell exists in the target battery based on the cumulative balancing time. This method can diagnose internal short-circuit faults while continuously performing balancing.

This invention discloses a method and device for classifying, attributing, and diagnosing abnormal temperature data collected by an energy storage battery management system (BMS). The method obtains an aligned multi-source time-series dataset by spatiotemporally aligning the battery cluster temperature time-series data, total current data, and individual cell voltage data. It then performs anomaly diagnosis on the underlying communication data link; if anomalies are found, the result is output and the process terminates. Otherwise, it performs transient temperature rise slope anomaly detection based on thermodynamic inertia; if a sudden hardware failure of the NTC sensor is detected, the result is output and the process terminates. If not, it performs thermal runaway risk cell location based on temperature-electric spatial mapping; if located, the result is output and the process ends. If not, it performs frequency domain sawtooth feature identification under coupled high-current conditions; if identified, the result is output and the process ends. If no feature is identified and the temperature continues to exceed the threshold, it is determined to be an external thermal management failure, and a cooling system fault alarm is output. This invention solves the problems of difficulty in detecting abnormal temperature in existing BMS technologies and significant safety hazards.

A semiconductor device and inverter circuit, belonging to the semiconductor field, includes a MOS power device and a freewheeling diode connected in anti-parallel to the MOS power device. The MOS power device is a silicon-based MOS power device and has a MOS transistor and a parasitic PN junction body diode. The MOS transistor and the parasitic PN junction body diode are integrally formed in an anti-parallel manner. The MOS power device includes a substrate, a drift layer, a well layer, a contact region, a source region, a gate insulating layer, a gate electrode, an interlayer insulating film, a source electrode, and a drain electrode. By configuring the overlap area of ​​the source electrode and the contact region in the MOS power device, the current carrying capacity of the parasitic PN junction body diode is less than or equal to half of the current carrying capacity of the MOS transistor, and the current carrying capacity of the freewheeling diode is greater than or equal to the current carrying capacity of the parasitic PN junction body diode. The total current carrying capacity of the freewheeling diode and the parasitic PN junction body diode is less than or equal to the current carrying capacity of the MOS power device, thus improving the reverse recovery characteristics.

This application discloses a multi-circuit common-zero leakage current monitoring method and system. This application can acquire the current signal of each feeder circuit in a feeder circuit set; perform Fourier transform processing on the current signal of each feeder circuit in the feeder circuit set to obtain the current vector corresponding to the current signal of each feeder circuit, the current vector including a real part and an imaginary part; perform vector superposition on the current vectors corresponding to all feeder circuits in the feeder circuit set to obtain a total current vector; calculate the amplitude corresponding to the total current vector; when the amplitude is greater than a preset leakage current threshold, it is determined that there is a leakage current fault in the feeder circuit set corresponding to the electrical equipment, and a leakage current alarm is triggered. Therefore, this application can effectively distinguish between normal unbalanced current and actual leakage current, significantly reduce the false alarm rate, and improve the accuracy and reliability of leakage current monitoring.

The present disclosure relates to a sensor temperature compensation device and method, and relates to the field of sensors, comprising: a current acquisition module and a temperature compensation module, the current acquisition module comprising a sensor and a follower, the sensor comprising a first transistor and a second transistor; the first end of the first transistor is connected with the first end of the follower and a measured load respectively, and the second end of the first transistor is grounded; the current acquisition module is used for transient current detection of the measured load; the temperature compensation module comprises a compensation power supply and a compensation circuit; the compensation power supply is used for driving the sensor temperature compensation device, and the compensation circuit is used for controlling the second transistor to output corresponding compensation current according to the transient current of the first transistor output by the second end of the follower, so that the junction temperature of the sensor is in a constant state; wherein the sum of the transient current and the compensation current is a constant current value. The total current output by the sensor can be controlled to be constant, thereby stabilizing the sensor junction temperature and improving the real-time performance and measurement accuracy of the sensor.

This invention relates to a method and system for identifying reverse recovery conduction paths and predicting dynamic characteristics of SiC MOSFETs, belonging to the field of power semiconductor device testing and reliability analysis. The method includes: Step 1: Constructing a dual-pulse test circuit and acquiring waveform data; Step 2: Preprocessing the data; Step 3: Extracting feature parameters and constructing feature vectors; Step 4: Outputting the conduction path type and device degradation state; Step 5: Based on the conduction path type, combined with the total current decomposition relationship and the dynamic response characteristics of the device under different test conditions, establishing a conduction path decomposition model, and calculating the current proportions of the MOS channel conduction path, body diode conduction path, and Schottky diode conduction path; Step 6: Predicting reverse recovery parameters; Step 7: Assessing device status, predicting remaining lifetime, and assessing failure risk. This invention automates the processing of dual-pulse test data and, for the first time, achieves quantitative identification of conduction paths.

The application provides a solid-state transformer and a load-side self-current-sharing control method and system thereof, and relates to the field of power electronic converters.The method steps are as follows: step S1 signal acquisition, step S2 average value calculation, step S3 voltage outer loop control, step S4 current inner loop control, step S5 each module feedforward compensation and control quantity generation, and step S6 dynamic self-current-sharing adjustment.Through a three-layer composite control architecture of "voltage outer loop for output voltage, current inner loop for total current, and DC voltage feedforward for current sharing", the DC voltage inside each module is used as a current sharing proxy variable, and under the premise of no high-speed communication between modules, high-precision, fast-response, and strong-robust self-current-sharing control of the solid-state transformer output side multi-module parallel connection is realized, the system reliability is significantly improved, the hardware cost is reduced, and the method is widely applicable to key scenes such as AI data center DC power supply, intelligent microgrid, and new energy grid connection.

The application provides a voltage source type high-speed train four-quadrant rectifier control method with introduced frequency additional damping. The application provides an improved voltage source type control scheme for the high-speed train four-quadrant rectifier, the traction transformer collects the voltage of the connection point of the vehicle and the traction network, the line total current effective value and the DC bus voltage of the DC side; first, the instantaneous reactive power Q and the active power P of the network side are calculated according to the collected data, the potential amplitude signal in the converter is obtained through the reactive loop; the V q FF additional damping is introduced in the active loop to calculate the synchronous phase angle; the control inner loop in the controller generates the PWM modulation signal for driving the four-quadrant rectifier according to the potential amplitude reference signal and the synchronous phase. The voltage source type control mode scheme is adopted to autonomously construct the voltage and the frequency, and the steady-state operation problem under the constant power characteristic under the weak railway power network can be solved.

This application proposes a voltage control method and device for a display screen, belonging to the field of display screen technology. The method collects the total current at the output terminal of the power module at a preset frequency, and calculates the target output voltage based on the total current, the preset equivalent impedance of the line, and the conduction voltage of the lamp board. This accurately matches the actual voltage drop loss of the current power supply line, achieving dynamic compensation for the line voltage drop. By directly adjusting the output voltage of the power module to the target output voltage, the power supply voltage at the lamp board can always be maintained within a reasonable range suitable for the load. Regardless of changes in the operating current of the display screen due to factors such as brightness adjustment, changes in screen content, or component aging, the power supply voltage can adaptively follow in real time. This effectively avoids undervoltage abnormalities or voltage redundancy losses at the lamp board, significantly reducing power consumption and improving energy efficiency while enhancing power supply stability and system robustness, ensuring long-term efficient and reliable operation of the display screen.

A MOV partial valve piece performance degradation early warning system and method, comprising: the voltage reduction function of the capacitor voltage divider arranged in the spark gap trigger auxiliary loop of the series compensation complete device converts the high voltage of the primary side MOV into low voltage of the secondary side, the low voltage signal of the secondary side is processed through the MOV voltage acquisition channel to obtain the MOV voltage; the current transformer CT in the MOV current loop converts the total circuit current of the primary side MOV and the MOV branch current into small current of the secondary side, the small current of the secondary side is processed through the MOV current acquisition channel arranged in the platform measurement box to obtain the total current of the MOV and the MOV branch current; the early warning analysis processing module takes the total current of the MOV, the MOV branch current and the MOV voltage as the criterion to early warn the performance degradation of the MOV partial valve piece based on the consistency of the volt-ampere characteristic. The present application realizes the prevention of MOV damage and guarantees the safety of the MOV.

A power load management device and method of operating thereof includes a plurality of outputs configured to connect to external loads; a current sensor; and a controller. The controller is configured to perform an output test sequence comprising sequentially measuring a current of each of the outputs by the current sensor; and perform an operating loop comprising switching off the outputs when a total current exceeds a current limit.