131 results about "Electric current pulse" patented technology

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.

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 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 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 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 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.

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.

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.

A method of measuring internal resistance of a battery during a charging process of the battery is provided in the present technology. The method includes applying a charging current to the battery by modulating a charging current limit, monitoring battery operating conditions including a state of charge (SOC) of the battery and a temperature of the battery, applying a first current pulse by adjusting the charging current limit of the battery based on at least one of the battery operating conditions satisfying one or more predefined thresholds, the voltage of the battery is measured during the first time window and the second time window of the first current pulse, and the internal resistance of the battery is estimated from a change in the voltage of the battery and a change in the charging current.

The application provides a mass spectrum interface structure and a mass spectrum analyzer, the mass spectrum interface structure comprises a metal electrode, an electrospray ionization needle, a metal plate and an analyzer, the metal electrode is connected to the tail end of the electrospray ionization needle, the head end of the electrospray ionization needle is provided with a nozzle and faces the metal plate, the metal electrode and the metal plate have a positive voltage difference, so that the ions in the electrospray ionization needle are sprayed from the nozzle and generate a blocking current pulse, the electrospray ionization needle is electrically connected with the analyzer, so that the analyzer analyzes the blocking current pulse and obtains the size of the ions. The mass spectrum interface structure and the mass spectrum analyzer provided by the application, the ions in the electrospray ionization needle are sprayed from the nozzle under the action of the voltage, when the ions with a size corresponding to the size of the nozzle are sprayed, a blocking current pulse is generated, the length and the width of the ions can be calculated through the signal amplitude and the blocking time of the blocking current pulse, so that the specific size of the ions is obtained.

The apparatus comprises an implant 200, which may be a cochlear implant, having a plurality of electrodes, a memory 102 configured to store instructions and a processor 104 configured to execute the instructions. When executed the apparatus transmits to a pulse generator 110 an electrode operation signal 106 configured to generate a current pulse on a first pair of electrodes of the implant (202-208, fig 2), receive a first impedance signal 108a from a first measurement pair of electrodes due to interaction of the current pulse with the electrically conductive volume. Then receive a second impedance signal 108b from a second measurement pair of electrodes due to interaction with the electrically conductive volume. The first measurement pair of electrodes and the second measurement pair of electrodes are different. The processor then uses a predetermined mapping relationship to determine a distance between an electrode contact surface on the implant and a wall of the electrically conductive volume and output the determined distance. A surgical instrument for implant insertion is also disclosed. [Figure 1 to accompany the abstract]

One example of the sensor assembly includes an energy storage capacitor, a waveguide, a pickup, and a memory circuit. The energy storage capacitor is connected between a first supply voltage input / output and an electrical common input and is configured to maintain a supply voltage. The waveguide includes an input end connected to a current pulse input, and a return end connected to the electrical common input. The pickup is configured to output a response signal to a sensor output in response to a magnetostrictive response in the waveguide that is produced in response to a current pulse received at the current pulse input. The memory circuit is configured to store data, transmit the stored data through the first supply voltage input / output, and receive data for storage through the first supply voltage input / output.

A pulsed laser diode driver includes an inductor having a first terminal configured to receive a source voltage. A source capacitor has a first terminal connected to the first terminal of the inductor to provide the source voltage. A bypass switch has a drain node connected to a second terminal of the inductor and a first terminal of a bypass capacitor. A laser diode has an anode connected to the second terminal of the inductor and the drain node of the bypass switch. A laser diode switch has a drain node connected to a cathode of the laser diode. The laser diode switch and the bypass switch control current through the inductor to generate a high current pulse through the laser diode that corresponds to a peak current of a resonant waveform formed at the anode of the laser diode.

This utility model pertains to electrical engineering, specifically to step-up converter devices incorporated into backup power supply devices for high-voltage loads obtained from a low-voltage battery. The converter is designed for highly efficient conversion of energy obtained from a low-voltage source, such as a battery, into a high, stabilized voltage for powering high-voltage loads, such as inverters or loads capable of being supplied with constant voltage. The technical result of this utility model is an increase in the efficiency of the output voltage while minimizing switching losses through soft switching and operation with low currents; increased reliability; and an expansion of the device's scope of application. This technical result is achieved through a combination of essential features.The essence of the utility model is that a two-link converter with galvanic isolation is connected to a primary source (1) and to an unregulated push-pull resonant step-up converter (2) connected to a control circuit (3) configured to form symmetrical current pulses alternately flowing from a common wire to a source through its half-winding of a transformer TR1 with a frequency set by the control circuit (3), wherein the unregulated push-pull resonant step-up converter (2) is connected to a step-up stabilized converter (4) connected to a control circuit (5) configured to convert a low, unstabilized input voltage at the terminals of the primary source (1) into a stabilized high voltage at the load (6).

Various arrangements involving a bidirectional pulse driver circuit are presented herein. The driver circuit can include a forward pulse trigger circuit and a forward pulse loop circuit. The forward pulse loop circuit can include a first silicon-controlled rectifier (SCR) that is activated by the forward pulse trigger circuit. The driver circuit can include a reverse pulse trigger circuit and a reverse pulse loop circuit. The reverse pulse loop circuit can include a second SCR that is activated by the reverse pulse trigger circuit. The driver circuit can also include a controller that activates the forward pulse trigger circuit and the reverse pulse trigger circuit in a first pattern to cause a current pulse to be applied to a load in a forward direction and in a second pattern to cause the current pulse to be applied to the load in a reverse direction.

The application provides an electrothermal analysis method and system for a phase change memory, comprising: proportionally dividing a phase change layer of the phase change memory into a plurality of sub-regions with the same volume; determining a doping proportion of the doping material, and calculating the number of sub-regions occupied by the doping material according to the doping proportion; randomly selecting a corresponding number of sub-regions to fill the doping material according to the calculated number of sub-regions, and filling the remaining sub-regions with a phase change material; determining electrothermal parameters of the doping material, the phase change material, an upper electrode, a lower electrode and an insulating and heat-insulating layer; determining boundary conditions and current parameters of the phase change memory; the boundary conditions are thermal boundary conditions, and the current parameters are RESET / SET current pulses; and combining the above-mentioned electrothermal parameters, current parameters and boundary conditions to perform thermal simulation analysis on the phase change memory, so as to determine the temperature field distribution inside the phase change memory after the phase change memory receives the RESET / SET current pulses, and further analyze the phase change region inside the phase change memory and the RESET / SET power consumption.

A method for evaluating a capacity of a serum to neutralize a virus is disclosed. The method includes preparing a solution comprising at least one cell, a serum and a virus, placing the solution in contact with an organic electrochemical transistor comprising a source, a drain and a gate electrode, wherein the source and drain electrodes are electrically connected by means of a conductive channel, applying a potential difference between the drain and source electrode, applying a plurality of pulses of a potential difference between the gate and source electrode and measuring a respective plurality of values of pulses of current flowing through the channel; calculating a value of an estimation of a response time of the transistor, and comparing the value of the estimated response time with respect to a threshold value and detecting whether the serum has a neutralising capacity against the at least one virus.

The invention discloses a three-phase switched reluctance motor torque control method based on alignment position detection, and relates to the technical field of motor control. Injecting a high-frequency current pulse into a non-conducting phase of which the inductance is monotonically changed along with the position in each position sector taking two adjacent aligned positions as end points, and ensuring that the non-conducting phase has no tail current before injection; estimating the inductance of the non-conducting phase according to the rising slope of the high-frequency current pulse injected into the non-conducting phase or the falling slope of the trailing current; if the inductance is smaller than the preset threshold value, instantaneous torque control based on a torque distribution function is adopted according to the inductance estimation position; otherwise, not estimating the position, neglecting the change of the conduction phase torque along with the position, and determining the conduction phase given current according to the current-torque characteristic at the 60-degree electrical angle position. As only the alignment position needs to be detected and the instantaneous torque control area is expanded, compared with the technology that instantaneous torque control is adopted only in the two-phase conduction area, the cost of the position sensor can be reduced, and torque pulsation can be restrained.

A method for detecting the presence or absence of a magnetic measurement probe at a measurement initiation location within an electromagnetic coil of an ophthalmic instrument includes: applying a transient current pulse to the electromagnetic coil; detecting a back electromotive force voltage spike induced in the electromagnetic coil by the current pulse; evaluating the decay behavior of the back electromotive force voltage spike; and correlating the decay behavior of the back electromotive force voltage spike with the presence or absence of the measurement probe at the measurement initiation location.

This invention relates to the field of lithium-ion battery testing technology, and specifically to a method for testing the peak power of lithium-ion batteries. Based on the qualified peak current value of the lithium-ion battery under a first state of charge, a peak current test value under a second state of charge is determined. Based on the peak current test value, a current pulse test of a preset time is performed on the lithium-ion battery under test to determine the battery terminal voltage and the actual pulse duration at the end of the test. It is then determined whether the battery terminal voltage falls within the qualified voltage range and whether the actual pulse duration reaches the preset time. If both are yes, the peak current test value is determined to be the qualified peak current value under the second state of charge. If either is no, a new peak current test value is determined based on the battery terminal voltage, the actual pulse duration, and the peak current test value, and the above steps are repeated until the peak power is determined. This invention constructs an efficient and stable automated method for testing battery peak power.