104 results about "Continuous current" patented technology

The invention discloses an AI-assisted self-adaptive control method and system for a gas safety valve, and relates to the technical field of gas safety control, and the method comprises the following steps: connecting the output end of an SEPIC circuit containing a continuous current mode and a discontinuous current mode with a coil of the gas safety valve; according to preset electrical and gas safety indexes, asynchronous data acquisition is carried out on the electrical and gas safety indexes, and an electrical and gas safety index sequence is obtained; utilizing an AI fusion analyzer on the edge MCU to perform interactive feature fusion analysis on the two types of sequences, and determining a self-adaptive control scheme of the gas safety valve; circuit modes are switched based on the control scheme, and the safety valve is driven to execute according to the switched SEPIC circuit. The technical problems that in traditional gas safety valve control, electric parameters and gas safety indexes are analyzed in a split mode, the circuit operation mode is single, and control response is inaccurate are solved, and the technical effects that efficient and reliable self-adaptive driving of the gas safety valve is achieved, and gas use safety and control flexibility are improved are achieved.

A method for charging a battery pack via an offboard energy source uses an interleaved boost converter and closed-loop control. The energy source outputs a charging current via a DC charge port during a direct current fast-charging (DCFC) process. A controller detects a voltage disparity condition in which a voltage capability of the battery pack exceeds a voltage capability of the energy source. In response to this condition, a rise of the charging current over time is recorded as a current trajectory and an open-loop equivalent time constant is extracted from the current trajectory. A time constant of the PI control block is set substantially equal to the equivalent time constant. The PIM is controlled in closed-loop using proportional-integral control. The charging current is controlled in a continuous current conduction mode during the DCFC process.

The invention provides a DC-DC forward boost-buck power conversion circuit based on cascaded Cuk topologies, and relates to the technical field of power electronic conversion, the circuit is mainly formed by cascading two Cuk topologies sharing one inductor, and the circuit also comprises a power supply end, a load end and a same-frequency driving signal generator. The same-frequency driving signal generator controls the two power switch tubes in the Cuk topology through a same-frequency signal, and the output voltage is adjusted by adjusting the duty ratio. The circuit not only keeps the advantage of continuous input and output current of a traditional Cuk circuit, but also converts the polarity of the output voltage from the reverse direction to the forward direction, and meanwhile, the voltage gain is remarkably improved, so that forward voltage conversion can be efficiently and smoothly realized. The circuit structure has the characteristics of high gain, forward output, continuous current, simple control and the like, and is suitable for occasions requiring high-efficiency and high-quality electric energy conversion, such as new energy power generation and energy storage, electric automobiles, precision industry and the like.

The invention relates to the technical field of graphene inspection, in particular to a graphene heating film inspection system, which comprises a pulse excitation and anomaly detection unit for applying pulse current excitation to a graphene heating film, synchronously acquiring acoustic emission signals and extracting abnormal coordinate points of which acoustic energy peak values exceed an abnormal threshold value; the fixed-point load and frequency shift monitoring unit is used for applying a continuous current load at the abnormal coordinate point, monitoring the sound emission main frequency migration volume in real time and generating a frequency shift rate curve; and the risk inspection unit is used for calculating a defect expansion risk level according to a critical time value corresponding to an inflection point in the frequency shift rate curve. According to the method, the defect expansion speed and the change trend thereof can be continuously tracked, a continuous quantitative index is provided for judging the defect stability and activation trend, and the interpretability and predictability of the micro evolution process are improved.

A distributed low energy dynamic thermal management system for solid matter prevention and control in oil and gas transportation pipeline includes a pipeline data monitoring terminal, a current and an electric pulse control terminal, a land console, an electric heating terminal, a wiring flange, an oil and gas transportation pipeline, a valve structure. The system monitors the state of the pipeline in real time by the pipeline data monitoring terminal, and transmits the monitoring data to the current and electric pulse control terminal in real time, the current and electric pulse control terminal produces different thermal responses to the electric heating terminal according to the state in the tube, raises the temperature inside the tube by generating a continuous current, unblocks pipeline by generating high power electric pulse, so as to realize real-time monitoring and local temperature dynamic control of oil and gas transportation pipeline.

The invention discloses a bistable electric permanent magnet brake for an integrated joint module, which comprises a brake rotor friction disc assembly, a brake stator assembly and an adsorption assembly, and is characterized in that the brake rotor friction disc assembly comprises an annular friction plate, a rotor annular armature and a rotor disc; the brake stator assembly comprises a stator annular armature and a stator connecting shell, and a guide groove is formed in the stator connecting shell; the adsorption assembly comprises a mounting shell and an electric permanent magnet adsorber, a sliding table is arranged on the mounting shell, and when current in the first direction is applied to the electric permanent magnet adsorber, the electric permanent magnet adsorber magnetically adsorbs the rotor annular armature and compresses the annular friction plate; when current in the second direction is applied to the electro-permanent magnet adsorber, the electro-permanent magnet adsorber magnetically adsorbs the stator annular armature and is separated from the annular friction plate. The magnetic adsorption force can be maintained through the electro-permanent magnet technology under the two steady states of locking and releasing, continuous current maintenance is not needed, magnetization or reverse magnetization can be completed only through instantaneous electrification during state switching, and power consumption is greatly reduced.

The application discloses a power rail and a control method thereof. The power rail comprises a track, the track has an interruption area at a position of a warehouse door, the track comprises two track sections located on two sides of the interruption area, and the track further comprises transition devices, the transition devices comprise two transition assemblies respectively arranged on the outer sides of the two track sections; the transition assembly comprises a transition rail and an expansion mechanism, the transition rail and the expansion mechanism can slide towards or away from the interruption area along a direction parallel to the track section, the transition rail is located between the track section and the expansion mechanism, and the expansion mechanism is used for driving the transition rail to move back and forth in a direction perpendicular to the track section, so that the two transition rails and the two track sections can be connected to form a continuous current collection surface. The power rail is provided with the transition devices, the sliding and expansion of the transition rails are controlled, the current collection surface of the power rail at the interruption area is a continuous surface, the current collection shoe can smoothly pass through, the pulling arc and noise between the shoe rails are effectively reduced, and train vibration can also be reduced.

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 discloses a continuous current pulse generation circuit for power device testing and a control method thereof, and relates to the technical field of power electronics, the continuous current pulse generation circuit comprises a power supply, a control unit, a switch unit, an energy storage unit, an inductive load and a current absorption unit; the switch unit comprises a first relay, a second relay, a third relay, n first switches and one second switch; the energy storage unit comprises n capacitors; the control unit is used for respectively controlling the on-off of the first relay, the second relay, the third relay, the n first switches and the n second switches, carrying out different-stage control on each capacitor, and providing continuous current pulse for the test of the power device; the different stages comprise a capacitor charging stage, a capacitor discharging stage according to a time sequence and a capacitor residual charge releasing stage. According to the invention, more real continuous current pulse can be provided for the power device, and the reliability test requirement of the device under the impact of the continuous current pulse is met.

The invention discloses a current sampling circuit and a current sampling system, and relates to the technical field of signal sampling, and the circuit comprises a sampling module which is connected with a to-be-tested device and a gating module, and a control module which is connected with the to-be-tested device and the gating module; the control module is used for acquiring current information of the to-be-tested equipment and transmitting a gating signal to the gating module according to the current information; and the gating module is used for selecting a target sampling unit from the sampling module to sample the to-be-detected current transmitted by the to-be-detected equipment according to the gating signal. And the sampling module is used for generating a corresponding potential difference signal according to the current to be measured and transmitting the potential difference signal to the control module through the gating module. Compared with the prior art, the continuous current path is formed by the at least two sampling units connected in series, and the target sampling unit is selected based on the gating signal to perform differential sampling, so that the current is kept uninterrupted during range switching, and the system stability and the measurement precision are improved.

This application provides a self-injection-locked narrow-linewidth laser with a quasi-continuous locking region, comprising: a semiconductor laser source for generating an initial linewidth laser and outputting it via end-face coupling; a photonic integrated microcavity chip including a bus waveguide and a microring resonator coupled to it via an evanescent wave, for receiving the initial linewidth laser and providing feedback light to the semiconductor laser through Rayleigh backscattering of the microring resonator to excite a self-injection-locking effect; the microring resonator is a compact folded waveguide microcavity with an ultra-low free spectral range, the free spectral range of which is less than a preset threshold, so that when the driving current of the semiconductor laser is changed for wavelength tuning, the self-injection-locking regions of adjacent resonant modes in the cavity physically overlap or are closely spliced ​​in the current tuning parameter space, so that the semiconductor laser can continuously transition between adjacent modes without experiencing permanent unlocking during continuous current tuning, forming a quasi-continuous locking region.

The utility model discloses a flashing unit, a flash bulb and an LED lamp string with good lighting effect, the flashing unit comprises a rectification circuit formed by a diode D1, a diode D2, a diode D3 and a diode D4, a compensation circuit formed by a capacitor C1, and a flashing circuit formed by a control chip IC and an LED chip LED1, the compensation circuit is connected in parallel with two ends of the flashing circuit, and the LED chip LED1 is connected in parallel with the rectification circuit. Two ends of the flicker circuit are respectively used as a power supply contact L1 and a power supply contact L2, and the rectification circuit is connected between the power supply contact L1 and the power supply contact L2; according to the utility model, the rectification circuit is adopted to convert the lighting effect into direct current power supply, continuous and uninterrupted current supply is provided for the control chip, timing logic interruption is avoided, and the compensation circuit is arranged to stabilize ripple fluctuation of the rectified direct current, so that power supply output is more stable, and the situation that flashes are not bright due to unstable voltage is reduced; and the lighting effect of the flash bulb is improved.

The application provides a battery active equalization device suitable for a lithium battery pack. The device comprises a lithium ion power battery module and a charge-discharge equalization circuit, wherein the lithium ion power battery module can be composed of a single battery monomer or a plurality of battery monomers connected in series or in series-parallel; the charge-discharge equalization circuit is composed of IGBT (containing an anti-parallel continuous current diode) and corresponding wires, the equalization device can realize energy equalization in the charge-discharge process, energy equalization in the idle state and other functions, and has the advantages of low equalization loss, small heat generation, fast equalization speed, flexible equalization mode and the like.

This application discloses an online floating-ground electrochemical scanning electrospray mass spectrometry (FSMS) device, relating to the field of analytical chemistry, which can improve the efficiency and accuracy of electrochemical detection. The device includes: a reaction chamber with a three-electrode probe for holding the target solution to be detected; a floating-ground electrochemical controller, including: a high-voltage module, a power supply module, a floating-ground electrochemical measurement and control circuit, and the three-electrode probe; the high-voltage module raises the first potential of the floating terminal of the power supply module to a second potential; the power supply module converts the voltage of the floating battery into a preset voltage to power the floating-ground electrochemical measurement and control circuit; the floating-ground electrochemical measurement and control circuit controls the output of a continuous high-voltage signal or a continuous current signal from the three-electrode probe, which acts on the target solution to generate an electrochemical reaction and directly produce spray ions; the voltage and current during the electrochemical reaction of the target solution are detected using the three-electrode probe to obtain the detection voltage and detection current.

This invention discloses a constant current control method for a primary-side feedback flyback converter, relating to the field of isolated converter technology. The method includes: when the primary-side feedback flyback converter operates in continuous current mode, determining the transformer demagnetization duration, cycle duration, and primary winding current valley value for the nth switching control cycle; obtaining the switching turn-off duration for the (n+1)th switching control cycle based on the transformer demagnetization duration, cycle duration, primary winding current valley value, a set reference primary current peak value, and the desired target current value; controlling the switching turn-on duration for the (n+1)th switching control cycle based on the reference primary current peak value, and controlling the switching turn-off duration for the (n+1)th switching control cycle to be the calculated turn-off duration. This method avoids low-frequency current ripple by eliminating the need for PID modulation calculations and can eliminate subharmonic oscillations at low input voltages.

The invention discloses a wavelet transform and energy entropy-based cable insulation defect identification method and device, and relates to the field of cable insulation defect identification, and the method comprises the steps: collecting three-phase wire core current signals of a to-be-detected high-voltage cable, and carrying out the discrete wavelet transform to obtain a multi-level high-frequency detail coefficient of each phase current signal; and a high-frequency detail coefficient corresponding to the highest decomposition level is extracted as a target high-frequency energy feature, so that fine high-frequency energy mutation can be accurately captured. A continuous current signal is segmented, the wavelet energy spectrum of each window is calculated, and the multi-window energy spectrum is normalized to eliminate differential interference, so that the defect phase can still be stably positioned even if the cable arrangement mode and the like are changed. The wavelet energy entropy of each phase of current signal is calculated, and insulation defects and external disturbance are effectively distinguished. According to the wavelet energy spectrum, the normalized energy spectrum and the energy entropy, an insulation defect identification result of the to-be-detected high-voltage cable is determined, a decision closed loop is formed through multi-dimensional verification, and the accuracy and robustness of insulation defect identification are greatly improved.

The application discloses a current sampling circuit, comprising a sampling resistor, at least two parallel signal amplification units and an output selection circuit. Each signal amplification unit has different preset voltage gain and preset bias voltage, and the signal amplification unit with higher preset voltage gain has lower preset bias voltage, thereby forming multiple continuous current range intervals corresponding to each signal amplification unit within the range of the current to be measured. The output selection circuit automatically selects the output voltage of the signal amplification unit corresponding to the current range interval where the current to be measured is currently located as the sampling result according to the output voltage of each signal amplification unit. The signal amplification units with multiple levels of gain are cascaded, and the corresponding signal amplification unit is automatically selected for output, so that when the current to be measured is small, voltage conversion is performed through a high-gain channel to ensure conversion resolution, and when the current to be measured is large, the output is automatically switched to a low-gain channel to avoid output saturation, thereby significantly improving the current sampling accuracy and system reliability.

A multi-phase switched capacitor converter is disclosed for converting a first voltage into a second voltage, or vice versa. The converter includes two sub-converters connected in parallel between an input voltage and an output voltage. Each sub-converter comprises a flying capacitor and a plurality of switches. Power conversion is performed by periodically switching the electrical connection between the flying capacitor and the voltage sources, between a first switching phase and a second switching phase. The two sub-converters alternately switch between a first system state and a second system state in a periodic manner. During the transition between the first and second system states, an overlapping system state is inserted, wherein both sub-converters are simultaneously in the first switching phase, thereby ensuring continuous current flow and reducing voltage spikes.

Systems and methods for implementing a continuous current monitor based on a low-side pilot power device is generally described. The semiconductor device includes a first circuit to filter an output signal from a power stage to generate a filtered signal that is coherent with an inductor current through an inductor in the power stage, a second circuit to generate a calibration code, and a third circuit to monitor current from a pilot device integrated in a low-side device of the power stage. The first circuit can calibrate the filtered signal to generate a calibrated signal based on the calibration code and the current from the pilot device. The second circuit can adjust the calibration code based on the calibrated signal. A combination of samples corresponding to the calibrated signal and samples corresponding to the current from the pilot device can recreate the inductor current.

The invention discloses alternating current conversion equipment, and belongs to the technical field of power conversion. In the alternating-current conversion equipment, an alternating-current conversion circuit is connected with an alternating-current source and a primary winding of a transformer, the alternating-current conversion circuit comprises at least one bridge arm, the two ends of the bridge arm are connected with the alternating-current source through bridge arm buses, the bridge arm comprises an upper bridge arm and a lower bridge arm which are connected in series, and each of the upper bridge arm and the lower bridge arm comprises two switching tubes. The two switch tubes of one of the upper bridge arm and the lower bridge arm are connected in series through common source electrodes, and the two switch tubes of the other one of the upper bridge arm and the lower bridge arm are connected in series through common drain electrodes; under the condition that the bridge arm is in the dead zone time period, the follow current module is provided with a follow current path, the alternating current conversion device is provided with a closed follow current loop, and the closed follow current loop comprises the follow current path, part of the switching tubes and the primary winding. According to the invention, a closed follow current loop is provided in a dead zone period, continuous current circulation is realized without interruption, tube pressure stress overshoot of a switching device is reduced, and the risk of damage to the switching device is reduced.

The invention relates to the technical field of batteries, and particularly provides a battery monomer, a battery and an electric device. The battery monomer comprises a shell, an electrode assembly and a pole. The electrode assembly is accommodated in the housing and is provided with a tab. The pole is installed on the first wall of the shell and comprises at least one first connecting part and at least two second connecting parts, the first connecting parts are used for being connected with the electric connecting pieces, the second connecting parts are used for being connected with the tabs, and one first connecting part is connected between every two adjacent second connecting parts. A nick groove is formed in the bottom wall of the second connecting part, and a first area is defined by the nick groove. In the thickness direction of the bottom wall, the orthographic projection of the welding part of the pole and the tab falls into the first area, and the nick groove is configured to disconnect the electrical connection between the tab and the pole when the internal pressure of the shell exceeds a pressure threshold value. The nick grooves are detonated when thermal runaway produced gas reaches a pressure threshold value, it is avoided that continuous current aggravates the reaction, heat is transmitted along a conductive path, and the thermal runaway risk is effectively controlled.

The embodiment of the invention provides a battery device control method, a battery management system, a battery system and electric equipment, and the control method comprises the steps: obtaining a first parameter of a battery device, the first parameter comprising continuous current and / or power, and a required decline rate of allowable current and / or power; a second parameter of the battery device is obtained, the second parameter comprises the rechargeable excess electric quantity, and the rechargeable excess electric quantity comprises the additional rechargeable electric quantity of the battery device exceeding the continuous current and / or power; and according to the first parameter and the second parameter, controlling the adjustment of allowable current and / or power for charging the battery device. According to the battery device control method, the battery management system, the battery system and the electric equipment provided by the embodiment of the invention, the overcharge risk of the battery device can be reduced, and the performance and the service life of the battery device are improved.

To provide a pulsed power supply capable of supplying a large pulsed current to a two-dimensional photonic crystal laser.SOLUTION: A pulse power supply for a two-dimensional photonic crystal laser (10) is a power supply that supplies a pulsed current to a two-dimensional photonic crystal laser (90), and includes a continuous current source (11), a switching element group (12) in which a plurality of switching elements (12-k) are connected in parallel, each switching element switching between a conductive state and a non-conductive state of a current according to a control electrical signal that is input and cut off from the outside, a connection circuit (13) that connects the continuous current source (11), the switching element group (12), and the two-dimensional photonic crystal laser (90) in series, and a control electrical signal source (14) that simultaneously inputs and cuts off the control electrical signal to each of the plurality of switching elements (12-k).SELECTED DRAWING: Figure 1

The present application relates to the technical field of solar cells, and discloses a back-contact cell, a photovoltaic cell structure, and a photovoltaic assembly, used for inhibiting current mismatch between different bus electrodes in a positive electrode, and between different bus electrodes in a negative electrode. The back-contact cell comprises: a cell body, and a positive electrode and a negative electrode that are formed on a backlight surface of the cell body. The positive electrode and the negative electrode each comprise a plurality of current collector electrodes, a plurality of bus electrodes, and at least one connecting electrode. At least one current collector electrode comprised in the positive electrode and at least one current collector electrode comprised in the negative electrode both are continuous current collector electrodes. Each bus electrode comprises a plurality of bus electrode sections that are distributed at intervals in a second direction, and an interval between two adjacent bus electrode sections in the same bus electrode is used for isolating each current collector electrode having polarity opposite to that of the bus electrode from the bus electrode. Each connecting electrode is connected to all the current collector electrodes having the same polarity as that of the connecting electrode, and is mutually insulated from the current collector electrodes having the polarity opposite to that of the connecting electrode.

The application provides a battery maximum power limitation control method and device and a vehicle. The method comprises the following steps: acquiring a current voltage, a current discharge current, a current single battery SOC and a current battery temperature, and determining a current discharge peak current and a current discharge continuous current according to the current single battery SOC, the current battery temperature, a discharge peak current mapping relationship and a discharge continuous current mapping relationship; calculating a peak power by using the current voltage and the current discharge peak current, calculating a continuous power by using the current voltage and the current discharge continuous current, and calculating an actual power by using the current voltage and the current discharge current; and in the case that the actual power is greater than the continuous power, controlling the battery maximum power to be limited to the continuous power within a predetermined time, and in the case that the actual power is less than or equal to the continuous power, controlling the battery maximum power to be limited to the peak power within the predetermined time, thereby solving the problem of the discharge power jumping between the peak power and the continuous power.

The invention discloses an intrinsically safe circuit control method based on software and hardware cooperative current limiting, and particularly relates to the technical field of intrinsically safe circuit control. Collecting transient current, temperature, a load state code and a communication period, and constructing a state vector; performing risk assessment on the state vector through a current limiting judgment model, and identifying whether a potential over-limit working condition exists or not; if the current exceeds the limit, matching an optimal hardware current-limiting path and starting a current-limiting device, dynamically adjusting a power supply period and a communication window according to current-limiting intensity and load characteristics, and generating and issuing a regulation and control instruction; the feedback current is compared with a safety threshold value, and whether the current limiting state is quitted or the regulation and control process is re-entered is judged; if the number of continuous current limiting failures exceeds the preset number of times, early warning is triggered, and a safe locking state is entered; according to the invention, intelligent current-limiting control and closed-loop adjustment of the intrinsically safe circuit are realized, and the intrinsic safety, response sensitivity and operation stability of the system are improved.

The utility model relates to an inner core of a surge protector, which comprises a socket and pins transversely and oppositely arranged on one side below the socket, and is characterized in that mounting seats are oppositely arranged on one side above the socket, one mounting seat is respectively connected with one corresponding pin, each mounting seat is respectively connected with a side plate, a graphite assembly is arranged between the side plates, and the graphite assembly is connected with the socket. The graphite assembly comprises a plurality of graphite flakes which are arranged between the side plates and are transversely arranged, an insulating sheet and a lug plate are arranged between every two adjacent graphite flakes in an abutting mode, the side plates are connected with the corresponding installation bases respectively, the number of the graphite flakes in the small-flow surge protector is increased, the consumption capacity of continuous current is improved, and the service life of the small-flow surge protector is prolonged. And the protection strength of the line is improved.

The invention discloses a preparation method of a superconducting joint for an MgB2 multi-core wire, and the method comprises the steps: 1, corroding a middle section of the MgB2 multi-core wire through concentrated nitric acid, and enabling an internal core wire to be exposed; 2, immersing the core wire into the molten Ti metal liquid to form a Ti protective layer, and cutting off the core wire from the middle part to obtain two wires to be connected; 3, inserting the Ti-plated ends of two wires to be connected into the Mg / B welding agent through the hole, and compacting to form a joint structure; and 4, phase-forming heat treatment. The Ti protection layer is introduced to the surface of the Mg / B / Nb core wire, contact reaction of the metal sheath and an Mg / B welding agent is effectively isolated, the MgB2 superconducting effective area of a joint area is increased, distortion or breakage of the Mg / B / Nb core wire is prevented, the thermal stability of a joint structure is enhanced, the electric-thermal-mechanical comprehensive stability of the superconducting joint for the MgB2 multi-core wire is cooperatively improved, and the superconducting joint has the advantages of being high in reliability, high in reliability and the like. And the MgB2 magnet is assisted to realize continuous current operation.

The embodiment of the invention provides a control method of a battery device, a battery management system, a battery system and electric equipment, and the control method comprises the steps: obtaining a first parameter of the battery device, the first parameter comprising continuous current and / or power, and a required decline rate of allowable current and / or power; a second parameter of the battery device is obtained, the second parameter comprises the dischargeable excess electric quantity, and the dischargeable excess electric quantity comprises the additional dischargeable electric quantity of the battery device exceeding the continuous current and / or power; and according to the first parameter and the second parameter, controlling the adjustment of allowable current and / or power for discharging of the battery device. According to the control method of the battery device, the battery management system, the battery system and the electric equipment, the performance of the battery device can be improved, the service life of the battery device can be prolonged, and the user experience is improved.