1307 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.

A medical device with an implantable blood pump and a control and sensing unit configured to determine the flow rate generated by the blood pump when driven by an electric motor, wherein the flow rate is determined using peak-to-peak current data generated by the electric motor and, in some cases, associated heart rate data. In some embodiments, the validity of pulsatility of the resulting blood flow is determined and, if out of predetermined limits, an alarm may be actuated.

The invention discloses a power supply circuit, a server and a time sequence control method, relates to the field of server power supply, and solves the problem that the demand of loads such as a GPU (Graphics Processing Unit) and a CPU (Central Processing Unit) on short-time peak power is increasingly increased at present. According to the power supply circuit, the long-time power supply module and the peak value compensation module are introduced to work cooperatively, the long-time power supply module provides stable energy conversion, and the long-term stable power supply requirement of a load is met; and the peak compensation module dynamically adjusts power supply according to the load demand and the working state of the long-time power supply module, provides or recovers energy, and meets the instantaneous peak power demand, thereby avoiding the defect that the peak current cannot meet the requirement or needs a large-scale redundancy and high-cost capacitor row in the traditional scheme, and improving the reliability of the system. According to the design, power supply stability can be guaranteed, system cost and size are reduced, and overall power supply efficiency and response capability are improved.

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 method for treating a patient via high-frequency (HF) electrostimulation therapy at an external target body location comprises generating a tonic motor activation (TOMAC) electrostimulation waveform using a power source supplying less than 100 volts zero-to-peak voltage amplitude per phase. The waveform has a frequency of 1,000 Hz to 5,000 Hz, a zero-to-peak current amplitude of 10-50 mA, and a duty cycle greater than 25%. The waveform is configured to overcome skin capacitance, induce proprioceptive afferent activity, and induce sustained tonic motor activation of a muscle. The method involves delivering the waveform to the external target body location over a specified duration during the patient's sleep period and receiving at least one TOMAC efficacy indication. The efficacy indication may relate to sleep efficiency, sleep stage, sleep onset latency, daytime sleepiness, CPAP compliance, or patient physiological response indicating TOMAC.

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 discloses a power device driver and a parameter correction method thereof, which are applied to the technical field of power device driving, and are characterized in that a data acquisition module acquires grid voltage and peak current of an IGBT (Insulated Gate Bipolar Translator) in the working process of the IGBT to obtain sampling data; the digital isolation chip realizes electrical isolation among the data acquisition module, the MCU and the grid voltage regulation module; the MCU calibrates the real-time junction temperature data based on the sampling data by using a preset junction temperature calibration formula and outputs calibrated junction temperature data; the gate driving chip outputs a gate voltage capable of driving the IGBT according to the control signal; the second-order short-circuit protection module sends an abnormal signal to the MCU when the IGBT is short-circuited, so that the MCU sends a grid voltage regulation trigger signal to the grid voltage regulation module; the grid voltage adjusting module responds to the grid voltage adjusting trigger signal and controls itself to reduce the grid voltage. Based on the power device driver and the parameter correction method thereof provided by the invention, the junction temperature monitoring precision and reliability are improved.

The invention discloses an IGBT junction temperature on-line monitoring circuit system based on grid peak current, and the system comprises an IGBT grid driver which is used for controlling a to-be-detected IGBT to charge and discharge; the grid signal processing circuit is used for converting the grid peak current of the IGBT to be detected into a narrow pulse voltage signal, performing amplitude processing on the narrow pulse voltage signal, and outputting the narrow pulse voltage signal after the amplitude processing; the two-stage narrow pulse peak holding circuit is used for holding the narrow pulse voltage signal after amplitude processing; and the acquisition and processing circuit is used for acquiring the signal output by the two-stage narrow pulse peak holding circuit to obtain an acquisition voltage, acquiring the frequency of the driving input signal, selecting a junction temperature calibration formula according to the acquired frequency, and calculating the junction temperature of the IGBT to be measured according to the acquisition voltage and the selected junction temperature calibration formula. The junction temperature monitoring circuit is high in monitoring precision, simple in circuit structure and few in influence factors during junction temperature monitoring.

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 provides an electric energy meter comprehensive performance evaluation method and system, and relates to the technical field of electric energy meters, and the method comprises the steps: carrying out the application load analysis through obtaining the basic specification information of a to-be-evaluated electric energy meter, and generating a non-standard load set; carrying out introduction analysis and fusion on a harmonic component, a peak current, a nonlinear power factor and a dynamic load for a non-standard load set to generate a plurality of groups of fused nonlinear introduction variables; determining a test circuit for testing the to-be-evaluated electric energy meter; inputting the multiple groups of fused nonlinear introduced variables into a dynamic load simulator to carry out load simulation on the test circuit, and recording multiple groups of precision test results of the electric energy meter; and performing comprehensive performance evaluation according to the multiple groups of electric energy meter precision test results to generate a comprehensive evaluation result. According to the invention, the technical problem of insufficient accuracy of the evaluation result caused by lack of performance evaluation means for the electric energy meter under the dynamic change load in the electric energy meter test in the prior art is solved, and the accuracy and practicability of the performance evaluation of the electric energy meter are improved.

The invention discloses a method for detecting cadmium ions and lead ions in a water body by utilizing a screen-printed electrode electrochemical sensor, which comprises the following steps of: constructing the screen-printed electrode electrochemical sensor by taking a screen-printed electrode of which the surface of a reaction end is modified with a ZIF-8 / MWCNT nano composite material as a working electrode; the method comprises the following steps: detecting the peak current change of a to-be-detected cadmium / lead ion solution by using a screen-printed electrode electrochemical sensor, and calculating the concentrations of cadmium ions and lead ions in the to-be-detected cadmium / lead ion solution by using a linear regression equation of the cadmium ion concentration, the lead ion concentration and the peak current change. The method provided by the invention has the advantages of simple operation, low cost, high detection efficiency, high detection accuracy and the like, can realize on-site detection of cadmium ions and lead ions in a water body, and has the advantages of convenient operation, high accuracy, strong anti-interference capability to interference factors, and good application prospect. The method is of great significance to efficient detection of heavy metal cadmium ions and lead ions in the water environment.

A switching power supply control method includes the following: after the high-voltage startup of the switching power supply, the secondary control module adjusts the cut-off current of the second switching transistor according to a voltage waveform at a second connection point until a voltage waveform at a first connection point just reaches zero, the primary control module controls the first switching transistor to be turned on; the primary control module adjusts the peak current of the first switching transistor until the peak current of the first switching transistor reaches a preset value, the primary control module controls the first switching transistor to be turned off; the secondary control module controls the second switching transistor to be turned on; and in case where the switching current of the second switching transistor is at a current zero-crossing point, the secondary control module controls the second switching transistor to be turned off.

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.

The present invention relates to the technical field of lithium ion battery testing, and discloses a lithium ion battery peak current estimation and testing method, comprising the following steps: respectively estimating the initial value of the charge / discharge test current; S2: performing response voltage determination processing on the initial value of the charge / discharge test current, and judging whether the response voltage of the initial value of the charge / discharge test current meets the charge / discharge test requirements; S3: if the charge / discharge test requirements are met, the initial value of the charge / discharge test current is the maximum charge / discharge current value of the tested lithium ion battery; if the charge / discharge test requirements are not met, the initial value of the charge / discharge test current is subjected to current test value iteration processing to obtain the charge / discharge test current iteration value; S4: performing response voltage determination processing on the charge / discharge test current iteration value to obtain the maximum charge / discharge current value of the tested lithium ion battery. The present invention estimates the initial value and iteratively adjusts the test current, reduces human intervention, and improves test accuracy.

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 discloses a peak current and valley current controlled three-mode buck-boost converter, which comprises a power level circuit, an error amplifier, a slope compensation module, a current sampling module, a PWM (Pulse Width Modulation) comparator, a mode control module and a switching control module, and is characterized in that the power level circuit obtains an output voltage according to an input voltage and outputs a sampling voltage; the error amplifier outputs a control signal according to a comparison result of the sampling voltage and the reference voltage; the mode control module outputs different enable signals according to the states of the input voltage and the output voltage; the slope compensation module outputs different compensation voltages when the converter is in different modes; the current sampling module collects the voltage of peak current or valley current according to different modes; the PWM comparator generates a PWM control signal; the switching control module generates a driving signal according to the PWM control signal and different enable signals so as to switch different modes. The mode switching efficiency can be improved, the duty ratio can be reduced, and then output voltage ripples are reduced.

The invention relates to the technical field of water electrolysis hydrogen production, and discloses a pulse current regulation and control method for water electrolysis hydrogen production, which comprises the following steps: S1, inputting parameter information acquired in real time and basic parameters acquired by initialization into a preset control algorithm model; s2, the control algorithm model calculates the frequency, the duty ratio and the peak current of the pulse current according to the input data; s3, the pulse power supply controller generates a corresponding pulse current signal according to the received parameters and outputs the pulse current signal to an electrode of the electrolytic bath; s4, the operation state of the water electrolysis hydrogen production process is evaluated every certain time interval, deviation data is fed back to the control algorithm model, and the calculation rule of pulse current parameters is optimized and adjusted; the hydrogen generation rate is remarkably increased, so that the hydrogen production efficiency is improved, the energy consumption in the water electrolysis hydrogen production process is effectively reduced, and the hydrogen production cost is reduced.

The invention discloses a peak current sampling circuit suitable for a DC / DC converter with a wide load range, and belongs to the field of switching power supply DC / DC converter control. The circuit comprises a power PMOS switch tube P1, a power NMOS tube N1, an inductor L1, a sensing resistor RS, a sensing capacitor CS, an output capacitor COUT, divider resistors RFB1 and RFB2, a sampling circuit, a low-pass filter, a differential amplifier, an adder / subtractor, a transconductance amplifier, a compensation resistor RC, a compensation capacitor CC, a PWM comparator, a slope compensation circuit, an oscillator, an RS trigger and a logic and driving circuit. An equivalent series resistor DCR of an inductor is utilized, and a low-pass RC sensing network is connected to two ends of the inductor in parallel to sense an inductive current, so that power consumption caused by a traditional sampling resistor RSENSE is eliminated, and the efficiency of the DC / DC converter is improved; through reasonable arrangement of the values of the sensing resistor RS and the sensing capacitor CS and an internal signal processing circuit, an inductance ripple current signal is amplified on the basis of retaining the inductance average current, the sampling signal-to-noise ratio is improved, and noise interference is reduced.

The invention provides an infrared oil measuring instrument for driving an infrared LED lamp through a pulse signal, relates to the technical field of detection, and comprises the steps of generating a pulse width modulation signal, generating a constant peak current based on the pulse width modulation signal, and driving the infrared LED lamp with a preset characteristic absorption wave number to emit pulse infrared light. After passing through the measuring tube containing the solution to be measured, the pulse infrared light receives transmission light and converts the transmission light into electric signals, all the electric signals are processed to generate absorbance values, and the oil concentration is calculated based on the absorbance values and a preset calculation model. The LED light source intensity is improved through pulse driving, multi-wavelength characteristic detection and constant current control are combined, the measurement precision and the system stability are remarkably improved, the manufacturing cost is reduced, and the device is suitable for online or portable oil product monitoring scenes.

The invention provides a PTC heater power control method, device and equipment and a medium, the method is applied to a controller of a PTC heater power control system, and the method comprises the following steps: calculating according to an obtained target power value and a current power value to obtain a power difference value; comparing the power difference value with a preset difference value to obtain a comparison result, and adjusting the current duty ratio to obtain a target duty ratio; and for the vehicle battery pack, the IGBT assembly performs continuous power supply control processing on the LC circuit according to the target duty ratio, so that the LC circuit performs real-time adjustment on the average voltage value of the PTC heater in each first preset period, and the current value of the PTC heater in each first preset period forms a preset waveform, thereby realizing power control on the PTC heater. According to the embodiment of the invention, peak current and noise are not generated in the control process, so that the safety is improved.

The invention relates to the technical field of LED illumination, and provides a constant current detection control circuit and device for a DC-DC LED dimming power supply. Comprising an MOS driving module; the driving module is used for receiving dimming control signals and generating driving voltage; a BUCK voltage reduction module; the voltage reduction module is used for reducing the driving voltage to generate an equivalent voltage signal; the peak current acquisition module is used for transmitting the LED output current to the MCU processor and determining a driving pulse width correction signal; and the current compensation calculation module is used for determining a compensation control signal according to the driving pulse width correction signal. The MCU is adopted as a control chip, an independent programming mode is adopted, and a corresponding peripheral acquisition circuit is matched to replace a drive control circuit with a BUCK drive IC as a core, so that the flexibility of BUCK drive application design is improved, and the BUCK drive circuit is not limited by the defects of a drive chip.

The invention belongs to the technical field of DC-DC converters, and particularly relates to a buck-boost single-inductor three-output DC-DC converter. The converter comprises a power tube, a divider resistor, a comparator, a control logic module, a turn-on time generation module, a self-adaptive turn-off time module and a current detection module. The power tube is used for a buck-boost topological structure of a traditional DC-DC converter; each path of output voltage of the converter is fed back to the comparator after passing through the divider resistor, and a duty ratio signal of the energy distribution switch is generated in the control logic, so that the power tubes are conducted in sequence; the turn-on time generation module is used for controlling the turn-on time of the system and generating a duty ratio signal of an energy generation switch in control logic, and the turn-on time generation module comprises peak current control and self-adaptive phase control; the steady-state switching frequency of the system is controlled by the self-adaptive turn-off time module; the current detection module detects inductive current information. The method has good key indexes such as cross modulation, response speed, conversion efficiency and the like.

The invention provides a permanent magnet motor short-circuit fault protection strategy determination method and system considering load characteristics. The method comprises the following steps: constructing a finite element model of a permanent magnet motor; determining a critical torque of the finite element model considering the potential constant torque load under a single-phase short circuit; determining a short-circuit peak current ratio of the finite element model under the potential constant torque load as a first short-circuit peak current ratio; determining a short-circuit peak current ratio of the finite element model under a reactive constant torque load as a second short-circuit peak current ratio; and according to the first short-circuit peak current ratio and the second short-circuit peak current ratio, short-circuit fault protection strategies of the permanent magnet motor in different load torque and inertia intervals are determined. The influence of the load characteristics on the short-circuit current is considered, the change characteristics of the single-phase short circuit and the three-phase short circuit of the permanent magnet motor under different load characteristics are obtained, the protection strategy is selected according to the ratio of the peak current and the short-circuit characteristics, and the situation that the protection strategy is mistakenly selected is avoided.

The present application discloses a control method, apparatus, device, and system for a charging and discharging circuit, and a storage medium. A neutral wire of a motor in the charging and discharging circuit is connected to a charging and discharging switching bridge arm group, the method including: acquiring a first current value in the neutral wire in real time during charging and discharging of a power battery by the charging and discharging circuit; and regulating the magnitude of the first current value according to the first current value, first peak current, and second peak current, where the first peak current is known peak current of the charging and discharging switching bridge arm group, and the second peak current is known peak current in the neutral wire. The control method for a charging and discharging circuit of the present application regulates the magnitude of the first current value according to the first current value in the neutral wire, the known peak current of the charging and discharging switching bridge arm group, and the known peak current of the neutral wire, and can thus timely adjust the current when an abnormality in the current value occurs during charging and discharging of the power battery, thereby avoiding damage to the circuit.