757 results about "Peak current" patented technology

The invention provides a single-tube boost PFC circuit control method and system for single-cycle control, and relates to the technical field of data processing, and the method comprises the steps: generating a self-adaptive PWM control signal according to a duty ratio adjustment amount and a frequency compensation factor, and dynamically limiting the pulse current amplitude of a power switch tube through a peak current prediction algorithm, a load current change rate is generated based on the real-time relevance between the pulse current amplitude and the load current; setting a first monitoring point in a dynamic duty ratio change path of the PWM control signal, and extracting a duty ratio change rate and a switching frequency fluctuation parameter in real time; setting a second monitoring point in a feedback path of a load current change rate, and extracting a load current slope characteristic and a transient change amplitude in real time; and based on the parameters of the first monitoring point and the second monitoring point, generating a correction factor through a dynamic response correlation model. According to the invention, a high power factor can be realized under wide input voltage and load fluctuation.

An electronic device may be provided with peripheral conductive housing structures, a rear wall, a first antenna, and a second antenna. The first antenna may have a resonating element formed from the peripheral conductive housing structures. The second antenna may have a folded antenna element overlapping the first antenna. The folded element may be disposed on at least three sides of a substrate. The folded element may follow a meandering path along at least two of the sides. A first end of the folded element may be coupled to a positive feed terminal. A second end of the folded element may be shorted to a conductive chassis. The folded element may exhibit minimum peak current magnitude at a surface of the substrate facing the rear wall, minimizing electromagnetic coupling between the first and second antennas and optimizing a radiation pattern of the second antenna through the rear wall.

The invention relates to a high-adaptability fused salt heat storage system in-situ monitoring method, which is characterized in that current and potential signals correspond to the concentration of impurity ions in fused salt through an electrochemical analysis method, and the current value of a characteristic peak corresponds to the concentration of impurities in the fused salt, so that sampling and chemical analysis are not needed; according to the method, the real-time concentration of the impurities can be obtained only by acquiring the characteristic peak current value through electrochemical scanning, the fused salt component analysis process is greatly simplified, the real-time monitoring of the ion concentration through the square wave voltammetry is an automatic and continuous process, and compared with a traditional analysis method, the method has the advantages of being high in sensitivity and analysis speed and suitable for popularization and application. And analyzable response can be generated to tiny concentration change. According to the invention, in-situ and continuous measurement of the concentration of the marker impurities in the molten salt can be realized, and timely and accurate feedback can be provided for changes of components and heat storage performance of the molten salt.

A control unit for operating a power converter in a buck-boost mode is provided. The control unit is configured to, within a switching cycle, operate the power converter in an IN state starting from the beginning of the switching cycle until a timer signal of a timer occurs. The control unit is further configured to subsequently operate the power converter in a THROUGH state stating from the timer signal until a peak current event occurs. The control unit is further configured to subsequently operate the power converter in an OUT state starting from the peak current event until a clock signal occurs, which indicates an end of the switching cycle.

The invention relates to the technical field of electric tool control, in particular to a motor control method of a target electric tool and a motor control circuit executing the motor control method, and the method comprises the steps: obtaining peak current at a detection resistor and a current PWM signal duty ratio, calculating real-time average current according to the peak current and the current PWM signal duty ratio, and comparing the real-time average current with an average current threshold value; and adjusting the duty ratio of the PWM signal according to the result, and outputting the PWM signal to drive the motor according to the adjusted duty ratio. By dynamically adjusting the duty ratio, the stability and safety of the electric tool under high load are effectively improved, the operation experience is optimized, the hardware upgrading requirement can be met, and the use bottleneck is broken through.

The invention relates to the technical field of energy storage battery management, and discloses a lithium battery SOP estimation optimization method, and the method comprises the steps: building a dual-polarization second-order RC equivalent circuit model of a lithium battery, and carrying out the online identification of resistance and capacitance parameters in the model through employing a least square method with a forgetting factor; based on the identified model parameters, estimating the SOC in real time by using an H-infinity filtering algorithm; then, under the SOC constraint, the OCV constraint and the battery allowable current constraint, continuous peak current is calculated respectively, the minimum value of the three is used as effective continuous peak current, and then an SOP preliminary estimation value under multiple constraints is obtained; and finally, inputting the parameters influencing the SOP estimation precision and a model method estimation result into a neural network model, and outputting a final SOP estimation value through training optimization. According to the method, the precision and robustness of lithium battery SOP estimation can be remarkably improved under the multi-parameter constraint condition, and the method is suitable for lithium ion battery power state real-time estimation in the fields of new energy automobiles, energy storage systems and the like.

The invention discloses a full-range drop-out fuse which comprises a base, the upper end and the lower end of the base are fixedly connected with an upper contact seat and a lower contact seat respectively, and a fuse carrier is installed between the upper contact seat and the lower contact seat. The fuse carrier is of a split type and comprises a current limiting part and a spraying part which are connected with each other in a detachable mode, and a first fuse wire in the current limiting part and a second fuse wire in the spraying part are connected between the upper contact seat and the lower contact seat in series. The fuse carrier comprises a current limiting part and an injection part which are connected in series, and has the advantages that a current limiting type fuse limits peak current under large fault current and does not inject combustible materials, and an injection type fuse is reliably switched on and off under the condition of small fault current, so that full-range fault current protection is realized; and meanwhile, the system has the advantages of good compatibility, low improvement cost and the like.

The invention discloses a SiC MOSFET junction temperature on-line monitoring circuit system based on a grid peak current method, which is connected with a SiC MOSFET to be detected for junction temperature monitoring, and comprises an FPGA, a digital driving circuit, a di / dt detection circuit, a peak current acquisition circuit and a sampling resistor, and the FPGA is connected with an output end of a PWM input signal; the FPGA dynamically adjusts the driving logic of the digital driving circuit by receiving a trigger signal of the di / dt detection circuit and a PWM input signal, and after effective output data of the peak acquisition circuit is obtained, a junction temperature data processing module in the FPGA analyzes and processes the data in real time, and finally outputs junction temperature information of the SiC MOSFET device. The junction temperature monitoring circuit has the advantages of high junction temperature monitoring sensitivity, strong anti-interference capability, simple circuit structure and the like.

The invention relates to an unbalanced data-oriented electric power system lightning disaster risk detection method, which comprises the following steps of: S1, gridding a target detection land parcel to obtain a plurality of grid units; S2, based on latitude and longitude coordinates of each grid unit, obtaining line parameters and environment characteristics of each grid unit in combination with a line database and a geographic information base, wherein the line parameters comprise tower height, span, grounding resistance, loop number, lightning arrester number and transformer capacity, and the environment characteristics comprise soil conductivity, building height and land utilization type; and S3, inputting the line parameters and the environment characteristics of each grid unit into a trained first detection model to obtain the thunder and lightning probability and the maximum peak current of each grid unit. Compared with the prior art, the multi-source data such as the tower height, the span, the grounding resistance and the soil conductivity are comprehensively considered, and the risk assessment result has higher regional adaptability and accuracy.

The invention relates to the technical field of electrical equipment state monitoring, in particular to an intelligent circuit breaker electrical life detection method and system based on data analysis. The method comprises the following steps: synchronously acquiring opening coil voltage and current sequences, a main loop current sequence and environment temperature data when a circuit breaker acts, extracting actually measured action time based on the coil data, and calculating a mechanical health degree factor by combining the environment temperature and the actually measured action time; after decoupling correction is carried out on an electrodynamic force interference factor derived by a peak current of a main loop, a mechanism wear state index is obtained; a nonlinear damage model containing basic electric heat loss and mechanical degradation acceleration factors is constructed, a single-time electric life loss value is calculated, historical loss values are accumulated, a dynamic threshold value is combined to realize full-life-cycle prediction, and evaluation interference of environmental factors and large-current electrodynamic force is eliminated through deep data analysis. The nonlinear acceleration effect of mechanism hysteresis on contact ablation is quantified, and the detection precision is remarkably improved.

A tool is provided including a motor, a power switch circuit disposed between a power source and the motor, and a control unit that controls the power switch circuit to drive the motor. The control unit is configured to apply a current clip threshold to a current passing through a bus line located between the power source and the power switch circuit to maintain a peak current of the bus line at approximately the current clip threshold. The control unit is further configured to variably control the current clip threshold based on the current passing through the bus line.

A method, apparatus and device for determining matching of a vehicle fuse and a wire, and a computer readable storage medium, the method comprising: receiving an input instruction of a user on a database matching interface, and obtaining a load current value, a peak current and duration, an ambient temperature and a loop length carried by the input instruction; when a one-key generation instruction is detected, determining a target fuse model according to the load current value and the environment temperature; determining a wire type selection value according to the load current value and the environment temperature; and when the DV verification instruction is detected, performing short-circuit verification and overload verification, and determining whether the wire type selection value is matched with the target fuse type, thereby solving the technical problems of low accuracy and low efficiency of the fuse and wire diameter type selection mode depending on manual calculation and experience table lookup in the prior art, and improving the accuracy and the efficiency of the fuse and wire diameter type selection mode. The matching accuracy and efficiency of the fuse and the wire are improved.

The invention relates to the technical field of backlight control, in particular to an LED display-oriented adaptive PWM backlight control method and a backlight driving system, which are suitable for the backlight driving system comprising a boost converter, a brightness controller and an LED channel, and the method comprises the following steps: the brightness controller outputs a control voltage, a peak current control word and a duty ratio signal, and receives a state signal. Receiving brightness data, determining a nominal peak current and a duty ratio, and initializing the nominal peak current and the duty ratio; adjusting the control voltage to change the boost output, monitoring the state, locking the working point when all states are converted from the first state to the second state, and taking the final switching channel as a reference; a peak current word is increased for the non-reference channel under the working point, and when the state returns to the first state from the second state, an optimized peak current is taken back; and adjusting the duty ratio according to the ratio of the nominal peak current to the optimized peak current to enable the average current of each channel to be consistent. According to the invention, the problem that excessive voltage drop of a linear current regulator causes extra power consumption and heating and influences the brightness consistency between channels is solved.

To suppress a welding quality from deteriorating even if an arc-interruption occurs due to arc blow, in consumable electrode pulse arc welding.SOLUTION: In a consumable electrode pulse arc welding control method, in which a welding wire is fed at regular feeding speed and rising transition currents that rise from base currents to peak currents are distributed during a rising period of time, the peak currents are distributed during a peak period of time, falling transition currents that fall from the peak currents to the base currents are distributed during a falling period of time, the base currents are distributed during the base period of time, and welding currents Iw described above are repeatedly distributed in a first pulse period to perform welding, feeding speed Fw in an arc-interruption period of time at times of T13-t2 is set to be higher than the regular feeding speed at times of t1-t13.SELECTED DRAWING: Figure 2

The invention provides an output peak current capability identification method, system and device and a medium, and relates to the technical field of motor controllers, and the method comprises the steps: obtaining a power loss function of a power unit in a power module; constructing an initial junction temperature observer according to thermal resistance network nodes of the power module; acquiring peak current of the power module under different preset boundary conditions through a power module test, wherein each preset boundary condition comprises a preset value of each peak current output capability influence factor of the power module; performing test correction on the initial junction temperature observer based on the power loss function and the peak current of the power module under different preset boundary conditions to obtain a target junction temperature observer; the peak current of the power module under the real boundary condition is obtained based on the power loss function and the target junction temperature observer, the current output capacity of the motor controller can be maximized on the premise that the junction temperature of the power unit does not exceed the safety threshold value, and the performance potential of the motor controller is brought into full play.

The invention relates to the field of electronic power, particularly discloses a bridge resonant converter based on forward and reverse shock coordination of double transformers, and belongs to the technical field of power electronic conversion. Aiming at the problems of over-high peak current, high magnetic core saturation risk, remarkable switching loss and the like of a traditional LLC resonant converter under the requirements of a wide load range and high power density, the invention provides the following innovative schemes: a dual-transformer forward and reverse excitation collaborative structure, a zero voltage switching (ZVS) driving technology and resonant network parameter optimization.

The invention discloses a method for testing the peak current of a power battery. The method comprises the following steps: S1, determining the actual capacity of a to-be-tested battery; s2, determining test conditions of the to-be-tested battery; s3, testing peak current; under the test condition, based on a plurality of preset reference current values, carrying out peak current test with the maximum value of the target pulse duration to obtain a plurality of actually measured pulse currents, sampling and recording a pulse whole-process voltage value, and intercepting to obtain an actually measured cut-off voltage corresponding to each pulse duration node; s4, calculating theoretical peak current; outputting measured data obtained by performing peak current testing on the same pulse time length node under different reference current values as a group of theoretical data, and calculating theoretical peak current under each pulse time length node based on the theoretical data of each pulse time length node; the actually measured data comprises actually measured cut-off voltage and actually measured pulse current; and S5, performing pulse actual measurement verification on the theoretical peak current.

The invention provides a water environment heavy metal pollution measuring method based on electrochemical analysis. The method comprises the following steps: constructing a linear coefficient comparison set and a constant term comparison set of peak current and concentration of heavy metal ions on a certain stripping volt-ampere peak potential by aiming at different samples in a water environment detected sample set of a certain heavy metal; and then, by constructing a water environment similar sample set of the to-be-measured sample for heavy metal pollution measurement, the measurement concentration of the to-be-measured sample about the heavy metal ions is given. According to the technical scheme provided by the invention, the to-be-detected water environment sample is matched according to the data of a certain heavy metal ion of the detected water environment sample in the past, so that the adaptability of rapidly detecting the heavy metal ions of different water environment samples through the electrochemical detection device is enhanced.

A control circuit for a switching converter has a valley current limiting circuit, a peak current limiting circuit, an ON time control circuit, and a switching control circuit. The valley current limiting circuit provides a valley current comparison signal by comparing a current sense signal with a first current threshold. The current sense signal is representative of a current flowing through a switching circuit of the switching converter. The peak current limiting circuit provides a peak current comparison signal based on the valley current comparison signal, a switching control signal, and a second current threshold. The ON time control circuit provides an ON time control signal based on the switching control signal. The switching control circuit provides the switching control signal based on the voltage comparison signal, the valley current comparison signal, the peak current comparison signal, and the ON time control signal to control the switching circuit.

Aspects disclosed in the detailed description include a processor-based system configured to dynamically mitigate peak current demand of a shared power rail powering a memory system. The processor-based system includes a plurality of processing units which utilize the memory system. The memory system is powered by the shared power rail. The processor-based system monitors a current demand of the shared power rail from the plurality of processing units, determines whether the current demand for the shared power rail exceeds a peak threshold, and, in response to the current demand exceeding the peak threshold, throttle one or more operating parameters of at least one of the plurality of processing units to reduce or slow access to the memory system and, thus, the current demand over the shared power rail.

The invention provides a flyback voltage conversion circuit and a control circuit and a start control method thereof. The control circuit comprises a conduction control circuit which provides a conduction control signal for conducting the primary side switch, and the conduction control circuit is used for controlling the frequency of the primary side switch; the turn-off control circuit comprises a soft start circuit and a peak current control circuit, and the turn-off control circuit provides a turn-off control signal for turning off the primary side switch; the trigger circuit is coupled with the turn-on control circuit and the turn-off control circuit, and the output end of the trigger circuit is coupled with the control end of the primary side switch; wherein the conduction control circuit controls the primary side switch to perform switching action at a first frequency in a first stage of the starting process of the flyback voltage conversion circuit and perform switching action at a second frequency in a second stage of the starting process of the flyback voltage conversion circuit, and the first stage is before the second stage; the maximum value of the first frequency is lower than the maximum value of the second frequency. According to the flyback voltage conversion circuit, the control circuit thereof and the start control method, the problem of start abnormity caused by valley bottom detection abnormity in the soft start process of the quasi-resonance flyback voltage conversion circuit can be solved.

The invention belongs to the technical field of new energy power, and particularly relates to an unmanned aerial vehicle hydrogen fuel cell hybrid power system and a control method thereof. The system comprises a fuel cell stack which is used for providing a reference power supply and has adjustable power output; the super capacitor bank is used for outputting peak current when transient high power is needed, and has the characteristics of high power density and quick response; the lithium iron phosphate battery pack is used for providing an emergency power supply when the fuel cell fails; the dynamic bus controller integrates the voltage hysteresis comparator and the CAN bus communication module and is used for controlling energy output of the fuel cell stack, the super capacitor bank and the lithium iron phosphate battery pack; the LSTM neural network prediction module is used for predicting a future power demand according to the flight attitude, the meteorological data and a historical load curve and triggering power climbing of the fuel cell in advance; and the Buck-Boost circuit is used for the fuel cell to directly charge the super capacitor bank, so that the dynamic response speed and the system stability of the unmanned aerial vehicle in a violent maneuvering state are remarkably improved.

The invention belongs to the technical field of lightning current monitoring, and particularly discloses an intelligent lightning arrester capable of monitoring lightning current and a monitoring method, which have the beneficial effects that localized operation calculation is performed through a rule engine, the diagnosis time consumption can be reduced, sampling can be quickly triggered through a dynamic threshold value, communication is performed through a dual-mode communication module, and the intelligent lightning arrester capable of monitoring the lightning current can be used for monitoring the lightning current. Therefore, timely data detection and real-time alarm can be realized, the characteristic extraction unit is used for extracting peak current Ip, wavefront time Tf, wave tail time Tt and oscillation index Oi to realize full coverage of waveform characteristics, and the life evaluation unit is used for calculating accumulated damage and residual life percentage of the equipment to realize full coverage of the waveform characteristics. The trigger threshold value of the current is calculated through the threshold value calculation formula according to the environment temperature and the relative humidity detected by the temperature and humidity sensor, accurate monitoring is achieved, and the situation of false alarm is avoided.

The invention discloses a multi-parameter collaborative optimization design method for a modular multilevel converter, and belongs to the technical field of modular multilevel converter design. In order to solve the problem of reasonable design of main parameters of the modular multilevel converter, a mathematical model of the modular multilevel converter is constructed; designing a capacitor voltage fluctuation model, a sub-module capacitor capacitance value model and a fluctuation quantity model, and analyzing the relationship between the capacitor voltage fluctuation and the operation condition and the relationship between the sub-module capacitor capacitance value and the operation condition; determining an upper limit value of the bridge arm inductance based on consideration of a system power operation range, determining a design initial value of the bridge arm inductance based on consideration of ring current suppression, determining a lower limit value of the bridge arm inductance based on consideration of resonance avoidance and fault current rise rate limitation, and obtaining a design range of the bridge arm inductance; adjusting the bridge arm inductance to obtain a design value of the designed bridge arm inductance; and according to the capacitance value of the sub-module capacitor and the design value of the designed bridge arm inductor, analyzing the peak voltage and the peak current of the power device IGBT to determine the parameter selection of the power device.

The invention relates to the field of electrochemical energy storage systems, in particular to a multi-energy complementary electrochemical energy storage system adaptive to load power abrupt change, which comprises a multi-source energy supply component, a power conversion module, an instantaneous power compensation unit (supercapacitor), a direct current bus, an energy storage converter and a central controller. The multi-source energy supply assembly is connected to the direct-current bus through the corresponding power conversion module, the super capacitor is directly connected with the direct-current bus, the energy storage converter is connected with the direct-current bus and the load, and the central controller is connected with all the assemblies. And when the load instantaneous power abrupt change exceeds a threshold value and the bus voltage deviates from an allowable range, the supercapacitor automatically triggers charging and discharging response, releases or absorbs peak current, and fills a power gap. According to the system, instantaneous load compensation is undertaken through the supercapacitor, a low-rate lithium battery and multi-energy priority power supply and dynamic power distribution are matched, an impact load is quickly responded, meanwhile, the system cost is reduced, the power supply stability and safety are improved, and the energy utilization efficiency is optimized.

A control unit for transitioning a power converter between a buck mode and a buck-boost mode is provided. The control unit is configured to, detect a peak current event within a switching cycle while the power converter is operated in the buck mode, and upon detecting the peak current event, start a timer for generating a timer signal. Furthermore, the control unit is configured to determine whether or not the clock signal for starting a subsequent switching cycle occurs prior to the timer signal, and to operate the power converter in the buck-boost mode within the subsequent switching cycle, if the clock signal occurs prior to the timer signal.

The invention discloses a resonant converter output overload and short circuit protection system and method without output current detection, and belongs to the technical field of power electronic converters. When a resonance tank current peak detection signal is equal to a ramp signal to trigger a comparator to output a high-level pulse, the edge triggers the microcontroller to interrupt, and the register value of the current ramp signal is captured immediately after interruption, so that a resonance current peak can be obtained. After an output overload and short circuit fault mark based on the value and the output voltage is triggered, the switching frequency is adjusted through the slope parameter self-adaptive controller to achieve output overload protection, and when the output overload is serious or short circuit occurs, rapid wave sealing protection can be achieved through a software code and a hardware comparator. And meanwhile, the soft start function of the resonant converter can be realized by gradually decreasing the initial value of the set slope descent rate cycle by cycle during starting. The control performance of the resonant converter is improved under the control of the peak current, and the output overload and short circuit protection function can be realized without adding an output current detection circuit.

The invention provides a current stress optimization method and system for an isolated bidirectional three-phase energy storage converter, and relates to the technical field of power conversion. Firstly, Fourier series analysis is carried out on primary and secondary side voltages of a high-frequency transformer, and leakage inductance current and active power are calculated accordingly; carrying out per-unit processing on the active power and the square of the primary side current, and obtaining the active power and the square of the peak current under the fundamental component based on a per-unit processing result; then, with the minimum square of the peak current as an optimization target and the transmission power under the fundamental component as a constraint, constructing and solving a current stress optimization model so as to obtain an optimal matrix converter parameter; and finally, performing current stress optimization control based on the optimal parameters to reduce the current stress. According to the method, the current stress is remarkably reduced while the set transmission power requirement is met, the direct current side dynamic response is improved, and the converter performance is improved.

Technologies and implementations for a wake-up circuit. The wake-up circuit may be configured to reduce a peak value of current draw during waking up of an electronic device. The reduction of the peak value of current draw facilitates a reduction of electrical burden on various components of related circuit. Managing wake-up of circuits may include managing wake up of memory.

The invention discloses a SiC MOSFET junction temperature on-line acquisition circuit which is connected with a to-be-measured SiC MOSFET for junction temperature acquisition, an independent grid peak current acquisition circuit is additionally arranged, and a low-frequency intermittent sampling strategy is adopted, so that a sampling resistor is in a non-working state in most of time, temperature rise is inhibited, the stability of the resistance value of the sampling resistor is ensured, and the reliability of the sampling resistor is improved. Accuracy of grid peak current acquisition and junction temperature prediction precision are substantially improved. The invention also discloses a SiC MOSFET junction temperature on-line acquisition method. According to the SiC MOSFET junction temperature on-line acquisition circuit and method provided by the invention, the grid resistance network and the grid peak current acquisition circuit are constructed, so that the self-heating problem of the sampling resistor under a high-frequency switch is solved.