210 results about "Electric current pulse" patented technology

The invention relates to the technical field of power batteries, in particular to a power battery pack health state detection method and system. The power battery pack health state detection method comprises the following steps: acquiring open-circuit voltage change data and terminal voltage fluctuation data of a battery under micro current pulse excitation, recording a change curve of voltage along with time through high-precision time sequence acquisition equipment, and obtaining an initial data set of voltage dynamic response; acquiring magnetic field intensity distribution and magnetic field gradient change data of the surface of the battery in a weak alternating magnetic field, and acquiring spatial magnetic field information through a magnetic sensor array to obtain a three-dimensional distribution diagram reflecting magnetic field nonuniformity; through a three-dimensional distribution diagram of magnetic field intensity distribution and magnetic field gradient change, a defect detection algorithm is adopted to analyze a mapping relation between magnetic field non-uniformity and internal micro cracks, and correlation distribution of defect positions and internal resistance growth rates is determined.

The invention discloses an LED chip service life rapid estimation method and device and a medium, and relates to the technical field of electrical digital data processing, and the method comprises the steps: designing a current pulse stress sequence for a calibration sample based on photoelectric thermal characteristic data, synchronously collecting photoelectric thermal response data before and after a pulse, and carrying out verification completion and mapping storage; generating a photoelectric thermal pulse response data set; according to the photoelectric thermal pulse response data set, photoelectric thermal change characteristics of the LED chip sensitive to the service life are extracted, and a photoelectric thermal pulse service life fingerprint of the LED chip is constructed; constructing a service life rapid estimation model, and predicting the service life of the LED chip according to the photoelectric thermal pulse service life fingerprint and the working condition information to generate the predicted service life of the LED chip; according to the method, the photoelectric thermal pulse life fingerprint of the LED chip is constructed, the photoelectric thermal evolution process under the pulse stress is compressed into a unified life characterization carrier, and a degradation feature basis capable of being directly called is provided for life modeling.

The invention relates to the technical field of battery pack charging control, and particularly discloses a sectional pulse charging control method and system, and the method comprises the steps: dividing a charging process into a plurality of charging intervals; a buffer zone is arranged between every two adjacent intervals; constructing a pulse control objective function; optimizing the initial parameters in combination with a particle swarm algorithm; performing transition control on the pulse amplitude and the duty ratio in the buffer zone, and fusing the optimization signal and the buffer signal to generate a final charging control instruction; compared with the prior art that a fixed current pulse or a simple segmented threshold hopping strategy is mostly adopted, voltage sudden change and severe temperature rise are likely to occur, and particularly under a nonlinear charging working condition, flexible transition of control parameters and service life-friendly charging adjustment are difficult to achieve, the method has the advantages that due to a buffer transition mechanism, the service life of the battery is prolonged, and the service life of the battery is prolonged. And pulse parameters are dynamically adjusted in combination with multi-objective optimization, so that the stability of charging control is improved and the cycle life of the battery pack is prolonged.

The invention relates to the technical field of energy storage battery module health monitoring, in particular to an energy storage battery module health monitoring method, which comprises the following steps: S1, applying a preset micro-current pulse sequence to each single battery in an echelon utilization energy storage battery module; s2, collecting voltage response data of each single battery under the excitation of the micro-current pulse sequence, and recording current temperature data of each single battery; s3, extracting a first characteristic parameter set and a second characteristic parameter set from the voltage response data; s4, a pre-established reference model is used, the model combines the characteristic parameters, the battery aging state and the temperature corresponding relation, and the real-time influence of historical damage and the current temperature is separated and quantified; and S5, based on the historical damage contribution and the current temperature instant influence contribution, evaluating the inconsistency of each single battery in the echelon utilization battery module. The method has the advantage of improving the accuracy of health state and inconsistency evaluation.

Implementations described herein are related to a diode driver that recirculates residual current from an operating current pulse in an inductor. Such recirculation produces a diagnostic current pulse to a diode array for measuring a voltage drop across a portion of the array. For example, after a controller charges an inductor of a diode driver to deliver operating current pulses to a portion of a diode array for illumination, the controller causes a residual current to remain and recirculate in the inductor. In some implementations, in response to the recirculating current reaching a monitoring threshold, the controller delivers a monitoring pulse to the portion of the diode array to measure a voltage drop across the portion of the diode array. In some implementations, the controller may infer defectivity in the portion of the array from such voltage drop measurements over time.

The invention discloses an abnormity identification method and device of a battery management system and a nonvolatile storage medium. The method comprises the steps that current pulses corresponding to a target battery are acquired, and the current pulses comprise a charging pulse and a discharging pulse; based on the current pulse and an equivalent circuit model, battery model parameters are determined, the equivalent circuit model is used for simulating the operation state of the target battery, and the battery model parameters comprise ohmic internal resistance, polarization internal resistance and polarization capacitance; estimating the state of charge of the target battery based on the battery model parameters to obtain a first state of charge estimation value; acquiring a second charge state estimation value of the target battery recorded in the target battery management system; and comparing the first state-of-charge estimation value with the second state-of-charge estimation value, and determining an abnormal identification result of the target battery management system. The technical problem that the failure of the BMS battery management system cannot be found in time in the charging process at present is solved.

The invention discloses an insulation discharge defect detection method and system based on solar-blind ultraviolet and UVA dual wavebands, and belongs to the technical field of electrical equipment insulation state detection.The method comprises the steps that a solar-blind ultraviolet waveband optical signal, a UVA ultraviolet waveband optical signal, a discharge current pulse signal, a solar-blind ultraviolet waveband image and a UVA waveband image of detected equipment are synchronously collected; carrying out lock-in amplification noise suppression on the UVA ultraviolet light signal, and extracting a photon event rate feature; extracting a light intensity peak value characteristic from the solar blind ultraviolet light signal, and calibrating a discharge quantity value through a nonlinear regression model in combination with a photon event rate; carrying out dynamic range expansion on the UVA ultraviolet image, and carrying out wavelet fusion on the UVA ultraviolet image and a solar blind ultraviolet image; fractal dimension features of the discharge channel are extracted from the fused image; and inputting the photon event rate, the light intensity peak value, the discharge capacity value and the fractal dimension features into a deep learning model, and outputting defect types and severity.

Radio-frequency (RE) microneedling skin resurfacing systems are described including an electrode with an array of partially insulated needles, where the needles' exposed tips conduct bipolar RF electric current into a patient's skin, thus enhancing collagen production that stretches the skin. The electrode is carried by an application handle, which connects to an RF current generator. The applied treatment cycles utilize vacuum to pull the skin against the needles and dielectric coolant to cool the epidermis. The needles' array penetrates the skin to a pre-determined depth inside the dermis layer, followed by a sequential delivery of RF bipolar current pulses. The treatment cycle is controlled by an algorithm, designed to raise the dermis layer temperature for a certain duration. The treatment cycle and algorithm rely on dynamic impedance measurements and temperature measurements by thermistors to assure optimized controlled heating of the dermis layer to a target temperature between 45 and 69°C.

The invention discloses a solid-state battery bidirectional DCDC multi-target optimization control system integrated with a BMS, and belongs to the technical field of battery management systems, and the system comprises an acoustic library building module which is used for applying current pulses of different amplitudes and rates, and collecting a high-frequency broadband sound wave response spectrum; analyzing the propagation speed, attenuation characteristics and frequency spectrum change of sound waves in the multilayer structure, and establishing an acoustic characteristic base library; the risk identification module is used for applying a micro-current detection pulse in a predetermined mode and capturing a transient acoustic response; accurate sensing of the microscopic physical state of the solid-state battery under the dynamic load working condition can be achieved, high-power charging and discharging and working condition abrupt change scenes can be rapidly adapted, the power response timeliness and the control precision are improved, meanwhile, global optimal balance of efficiency, service life and power stability is achieved, uneven deposition of lithium ions is restrained, and the service life of the solid-state battery is prolonged. Interface impedance and failure risks are reduced, and safe and reliable operation of the system is guaranteed.

The present invention belongs to the technical field of magnetic storage. Specifically, the present invention relates to a method and apparatus for generating Skyrmions on the basis of current pulses, and a magnetic field control method and apparatus therefor. The magnetic field control method comprises: acquiring a target sample, wherein the target sample comprises electrodes and a material layer; placing the target sample in a controllable magnetic field, and applying preset current pulses to the electrodes, so as to generate Skyrmions on the material layer on the basis of the controllable magnetic field and the preset current pulses; and controlling the erasure and writing of the Skyrmions by means of the controllable magnetic field. Therefore, the present invention solves the problems in the prior art of techniques being complex and the cost being high.

A liquid level sensor can include a circuit board and a thermistor bridge supported by the circuit board comprising a first pair of thermistors and a second pair of thermistors. A heat sink can be coupled to the circuit board proximate the first pair of thermistors and not the second pair of thermistors. A power supply can be configured to provide pulses of electrical current through the thermistor bridge. A controller in communication with the thermistor bridge can be configured to receive a measurement signal from the thermistor bridge output a low product indication when the measurement signal satisfies a predetermined condition.

The invention relates to a method for monitoring the state of a locking device of a spinning station of a rotor spinning machine, comprising the following steps: generating two current pulses in a time sequence, the second current pulse having an amplitude opposite the sign of the first current pulse, the time sequence being controlled by a switching unit of a control device of the spinning station; a measured value of each current pulse is determined on the basis of a switching process of the switching unit, a difference between the measured values is ascertained, the difference is evaluated on the basis of a comparison with a reference value range, the reference value range being specific to whether the locking device is in the closed state or the open state, and the locking device is in the closed state or the open state. -determining the state of the locking device on the basis of the result of the evaluation. The invention further relates to a rotor spinning machine and a computer program.

The application provides a fast charging circuit of a power energy storage device and a charging method and a charger thereof, which comprises a forward conversion module, the forward conversion module outputs a first stable current or a second stable current to the energy storage device through a transformer, wherein the first stable current is smaller than the second stable current; a pulse rising energy storage capacitor, which is electrically connected to the transformer, the pulse rising energy storage capacitor is electrically connected to the energy storage device through a control switch, when the output of the charging circuit is switched from the first stable current to the second stable current, the control switch is closed, and the pulse rising energy storage capacitor charges the energy storage device; and a pulse falling energy storage capacitor, which is electrically connected to the output end of the forward conversion module and the pulse rising energy storage capacitor when the charging circuit is switched from outputting the second stable current to the first stable current. The application can generate continuous current and high-quality pulse current, and has high charging efficiency.

The invention relates to a multi-stage electric field auxiliary forming device and method for a high-temperature titanium alloy thin-wall corrugated board structure. A high-temperature titanium alloy foil is placed on a feeding table, a motor power source is switched on to enable a lower forming roller to rotate, the foil enters the position between an upper forming roller and the lower forming roller, the motor power source is switched off after the foil is gripped, and a low-voltage large-current pulse direct-current power source is switched on; and the foil is heated. When the temperature of the foil reaches the target temperature, the motor is powered on, the lower forming roller rotates to drive the upper forming roller and the foil to move, and the corrugated board characteristics are preformed. And then, the pre-formed corrugation enters a second-stage forming process, and the specific forming process is kept consistent with the previous-stage forming process. And finally, the corrugated board is formed through multi-stage electric assistance. Compared with the prior art, through multi-stage forming, the current needed by single-stage forming is reduced, the service life of the device is prolonged, the requirement for the measuring range of a pulse direct-current power source is reduced, and accurate forming of the small fillet characteristic of the high-temperature titanium alloy corrugated board is ensured through the current directional flowing characteristic.

The application discloses an electrostatic protection device simulation device and simulation method, comprising: establishing an electrostatic protection device model; setting a plurality of parameter values corresponding to parameters, setting a plurality of current pulse signals input into the electrostatic protection device based on different parameter values, the parameters including working temperature; inputting the parameter values into the electrostatic protection device model, applying a plurality of different current pulse signals corresponding to the parameter values to the electrostatic protection device model, respectively simulating the electrostatic protection device, and outputting voltage pulse signals; generating I-V characteristic curves corresponding to the parameter values based on the plurality of current pulse signals and the plurality of voltage pulse signals corresponding to the parameter values. The electrostatic protection effect can be verified before chip manufacturing, the simulation precision is high, the design cost of the electrostatic protection device is greatly reduced, the influence effect of the working temperature on the electrostatic protection device can be obtained, and thus the optimal working temperature of the electrostatic protection device can be obtained.

This invention discloses a method for preparing a Pd-BiOI / ordered mesoporous carbon electrode, comprising: step S1, preparing an ordered mesoporous carbon electrode material using a soft template method under low-temperature hydrothermal conditions; step S2, using a three-electrode system, with the ordered mesoporous carbon electrode material as the working electrode, a platinum sheet as the counter electrode, and a saturated calomel electrode as the reference electrode, using a hydrochloric acid solution containing PdCl2 as the electrolyte, and depositing a Pd / OMCs electrode using a multi-step current pulse method; step S3, adding KI to ethylene glycol and dissolving it by magnetic stirring; then adding Bi(NO3)3•5H2O and stirring magnetically to obtain a mixture a; placing the mixture a and the Pd / OMCs electrode prepared in step S2 in a high-pressure reactor lined with polytetrafluoroethylene, and performing a hydrothermal reaction under high-temperature conditions, followed by rapid cooling after the reaction, removing the electrode and rinsing it with distilled water to obtain the Pd-BiOI / OMCs electrode. The Pd-BiOI / ordered mesoporous carbon electrode prepared by this invention has both excellent electroadsorption and visible light photocatalytic performance, and is expected to become an ideal electrode material integrating electroadsorption and photocatalysis.

Method for determining the charge of battery cells of an energy storage device of a motor vehicle; wherein the method comprises: applying a current pulse to each battery cell; recording a voltage response of each battery cell to the current pulse; determining charge information relating to the charge of the battery cells, taking into account the respective voltage responses of the battery cells; and outputting the charge information.

The invention discloses a porefilling copper plating method, which comprises an electrolytic tank body, a power supply module, a partition flow control module and a temperature control module, the electrolytic tank body is divided into a pretreatment area, a porefilling area and a post-treatment area, the power supply module comprises three groups of independent adjustable electrodes which are respectively arranged in the porefilling area, the partition flow control module is arranged in the porefilling area, and the temperature control module is arranged in the porefilling area. Sequentially carrying out oil removal, micro-etching, activation and pre-plating treatment on the PCB to be plated in the pretreatment area; fixing the pretreated PCB in a hole filling area, injecting a hole filling plating solution, starting a power supply module and a partition flow control module, performing hole filling and copper plating by adopting parameters of gradient current, pulse frequency of 500800Hz and plating solution temperature of 28-32 DEG C, and performing hole filling and copper plating by adopting a spraying flow rate of 1.0-1.2 m / s and a circulating flow rate; according to the method, hole-filling copper plating combining the solution and the device is adopted, hole-filling copper plating of micro holes with the hole diameter smaller than or equal to 0.2 mm is met, the filling rate of copper layers in the holes can reach 95% or above, the thickness difference between hole openings and plate surface plating layers is smaller than or equal to 5 micrometers, the overall process stability is high, and operation is easy.

The application discloses a kind of LED chip life quick estimation method, equipment and medium, it is related to electric digital data processing technical field, including, based on photoelectric thermal characteristic data, for calibration sample design current pulse stress sequence, photoelectric thermal response data is synchronously collected before and after pulse, and is checked and is completed with mapping storage, generates photoelectric thermal pulse response dataset;According to photoelectric thermal pulse response dataset, extract the photoelectric thermal change characteristic sensitive to the life of LED chip, and construct the photoelectric thermal pulse life fingerprint of LED chip;Build life quick estimation model, and according to photoelectric thermal pulse life fingerprint and working condition information, the life of LED chip is predicted, generates the predicted life of LED chip;The application is compressed into unified life representation carrier by constructing the photoelectric thermal pulse life fingerprint of LED chip, photoelectric thermal evolution process under pulse stress is as life modeling provides directly callable degradation feature basis.

FIELD: protective coatings.SUBSTANCE: method for forming a protective oxide-ceramic coating on the surface of products made of valve metals and alloys by the plasma electrolytic oxidation method involves immersing the product as an electrode together with a counter electrode in a bath filled with an aqueous alkaline electrolyte, and supplying rectangular pulses of anodic and cathodic voltage to the electrodes using a pulsed power source. Anode and cathode voltage pulses are supplied with a current-free pause between them, the value of which is 4.8 times the duration of the anode pulse. The amplitude values of the cathode voltage pulses range from 85 to 149 V with a pulse repetition frequency from 1000 Hz to 4000 Hz, while the current pulse repetition frequency is additionally regulated.EFFECT: obtaining oxide-ceramic coatings with specified properties under reduced energy conditions, with lower values of cathode voltage.1 cl, 2 ex

The invention belongs to the field of electronic devices and manufacturing thereof, and particularly relates to a non-volatile magnetic holding switch with a temperature compensation function. A first magnetic core and a second magnetic core which are magnetized and saturated firstly, removed from an external magnetic field and completely identical are arranged, a winding is wound on the second magnetic core, and two windings are wound on the first magnetic core; one winding of the first magnetic core is completely the same as the winding on the second magnetic core, so that the temperature change of the first magnetic core is compensated through the second magnetic core, the sensing values and the impedance values of the two magnetic cores are enabled to have the same change, and the level amplitude of a point D does not change along with the temperature; the first magnetic core is controlled to be switched between a non-volatile remanence state II and a non-volatile demagnetization state IV through forward and reverse current pulses under the assistance of a comparator switching circuit, so that switching of a switch MOS (Metal Oxide Semiconductor) tube is realized; therefore, mechanical motion switch switching of an armature in an existing magnetic latching switch is replaced. The device is simple in structure, low in cost, nonvolatile, low in power consumption, high in response speed and resistant to mechanical shock; the magnetic latching switch is especially suitable for application scenarios of the magnetic latching switch with reliability and high integration, and has very important value.

The application discloses an axial flux motor and a stepping control method thereof, and adopts a stepping control mode to realize accurate control of the motor. By acquiring operation parameters of the axial flux motor, initial angle and stepping angle of the axial flux motor are determined, and then the energization period of the axial flux motor is determined, a stator excitation waveform image is drawn, three-phase current for controlling the axial flux motor is generated, and the PWL function is used to realize stepping rotation of the axial flux motor. The technical scheme has the advantages of high precision, the rotation angle and speed of the axial flux motor are accurately controlled by controlling the number and frequency of current pulses, high-precision position positioning and motion control are realized, and the axial flux motor is suitable for application occasions such as communication and data transmission gimbals as a driving motor.

This invention relates to the technical field of energy storage control in transportation, and provides a method and system for energy storage control in transportation. The method includes: acquiring real-time status information of an electric vehicle; when the real-time status information indicates a low-load operating state or a charging state, applying a current pulse to the battery cell and measuring the voltage response; calculating the internal resistance and available power based on the voltage response and storing it as a performance record; acquiring future operating plans and analyzing the charge and discharge load of the battery cell in future operating cycles based on the future operating plans; obtaining risk analysis results based on the performance record and charge and discharge load; setting personalized balancing targets for the battery cell based on the risk analysis results; and pre-allocating energy to the battery cell according to the personalized balancing targets when the real-time status information indicates a low-load operating state or a charging state. This invention improves the overall performance of energy storage control in transportation.

The invention belongs to the technical field of metal material surface treatment, and discloses a production process of a weldable electroplated chromium plate. According to the process, cluster-shaped peak morphology is transferred on the surface of a cold-rolled steel coil through a laser texturing roller, and staged double-layer chromium electroplating is combined, specifically, a discontinuous chromium layer is formed on the top of a micro convex peak through first-time high-current pulse electroplating, and local iron leakage points are reserved; the second low current direct current plating covers an ultrathin continuous chromium film to maintain macro passivation. According to the invention, a composite functional structure with both macroscopic passivation integrity and microcosmic conductive selectivity is constructed on the surface of chromium-plated iron by accurately controlling the microstructure of the surface of a base material and double-layer chromium plating process parameters, so that the technical bottleneck of the chromium-plated plate in resistance welding application is effectively solved, collaborative optimization of weldability and corrosion resistance is realized, and the application range of the chromium-plated plate in resistance welding is widened. And a reliable technical path is provided for comprehensive replacement of chromium-plated iron in the field of metal packaging.

A system for determining an operational state of an atmospheric pressure plasma. The system has a transformer for coupling power into the atmospheric pressure plasma, a current sampling circuit configured to sample at least one current pulse flowing through a primary winding of the transformer, and a programmed microprocessor configured to determine, from a waveform of the current pulse, the operational state of the atmospheric pressure plasma. The operational state is one of: a no plasma state, a plasma origination state indicative of an ignited arc expanding into a plasma by gas flow thereinto, and a plasma maintenance state indicative of the plasma being expanded.

This invention discloses a control method and control system for pulses in a physiotherapy device. The method includes: acquiring detection data collected by the patch during its operation; wherein the detection data includes: electromyography (EMG) data, skin impedance, skin temperature, and pressure distribution; identifying the patch's fit degree based on the skin impedance and pressure distribution; after the fit degree meets the standard, determining the current operating state category of the physiotherapy device based on the EMG data and skin temperature; obtaining electrode current compensation and heating power compensation for the patch based on the operating state category; and controlling the patch to adjust the current pulse and temperature based on the electrode current compensation and heating power compensation. This invention solves the technical problem in the prior art where physiotherapy devices cannot adaptively adjust different pulse controls for output, and can automatically adjust the current pulse and temperature parameters to suit the user when using the physiotherapy device, improving the user experience and ease of use.

Welding power supplies, wire feeders, and systems to measure a weld circuit resistance via communications over the weld circuit are disclosed. An example welding-type power supply includes: a power converter configured to: convert input power to output a current pulse via a weld circuit; and convert the input power to output welding-type power via the weld circuit; a voltage monitor configured to measure a power supply output voltage of the current pulse; a receiver circuit configured to receive, via the weld circuit, a communication comprising a second voltage measurement; and a controller configured to: determine a resistance of a portion of the weld circuit based on the power supply output voltage measurement, the second voltage measurement, and a weld circuit current measurement; and control the power converter to convert the input power to output the welding-type power based on a weld voltage setpoint and the impedance.

The utility model provides a battery impedance measuring device which comprises N pulse excitation switches which are controlled to be switched on and switched off by pulse excitation signals and can generate pulse excitation current which serves as current excitation of a battery unit; the N series resistors and the N pulse excitation switches form N series circuits in a one-to-one correspondence mode, and the two ends of the N series circuits are connected to the positive electrode output ends and the negative electrode output ends of the N battery units in a one-to-one correspondence mode; and the impedance acquisition circuit can be connected with the positive electrode end and the negative electrode end of each battery unit, and is used for acquiring voltage response signals of the corresponding battery units when current excitation is carried out on the N battery units.

A magnetoresistive component (100) is provided, comprising at least one magnetoresistive element (110) comprising a layer stack of ferromagnetic layers (112; 114; 116; 118) and non-magnetic layers (113; 115) stacked in a first direction. The layer stack comprises a ferromagnetic layer (112; 118) with a magnetic orientation to be switched. Adjacent to the ferromagnetic layer (112; 118), a first conductor (120-1) extends in a second direction, and a second conductor (120-2) extends in a third direction. The first and second conductors are configured to induce spin-orbit torque (SOT) in the ferromagnetic layer (112; 118). A control circuit (130) is configured to apply a first current pulse to the first conductor (120-1) and a second current pulse to the second conductor (120-2) in a temporally overlapping manner and with different time characteristics.For example, the control circuit (130) may be configured to switch off the second current pulse before the first current pulse is switched off in order to switch the magnetic orientation of the ferromagnetic layer (112; 118).

A technique of charging a capacitive load is presented in which the load is charged by current pulses in a sequence of stages. The amplitude of the current pulses in each stage increases from one stage to the next. Transition between stages is triggered by the voltage across the load meeting a threshold requirement, until a target voltage is reached. The slew rate of a rising edge of each current pulse is lower than the sew rate of the falling edge.