155 results about "Continuous current" patented technology

A DC / DC converter has a coil connected to a connection point between a main switch and a subordinate switch connected in series; and alternately turns on / off the main switch and the subordinate switch, thereby converting a direct current input voltage into a predetermined direct current output voltage. The DC / DC converter includes a current mode detection unit for detecting either a continuous current mode in which a current flowing through the coil does not pass through a zero point, or a discontinuous current mode in which the current flowing through the coil passes through the zero point, when the subordinate switch is ON; and a subordinate switch control unit for controlling the ON time of the subordinate switch in a next or later cycle, based on a time from turning-off of the subordinate switch until a voltage at the connection point reaches a predetermined threshold value.

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 present invention proposes a method for implementing continuous current soft switching of a switched inductor battery balancer. The method is divided into three cases according to the voltage of the battery cells being balanced, namely, no balancing is required between the battery cells, battery cell B1 transfers energy to battery cell B2, and battery cell B2 transfers energy to battery cell B1. The signal is modulated according to the modulation ratio to obtain a PWM signal for controlling the first switch tube S1 and the second switch tube S2. The method of the present invention can realize soft switching of all the switch tubes in the balancer, reduce the loss of the balancer, and improve the efficiency. In addition, the control of the balancer does not require the participation of the current feedback signal, eliminates the current sensor, saves the cost of the balancer, and thus greatly improves the market competitiveness of the switched inductor lithium-ion battery balancer.

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.

A test system for high-voltage and high-current testing of power semiconductor devices comprised in a wafer which has a test machine, a needle probe card and a contacting system is provided. The contacting system has a wafer housing conductive portion and a test electrical circuit closing contact conductive portion. The test electrical circuit closing contact conductive portion has a shape and an extension to determine respective straight and continuous current conduction paths from each power semiconductor device to at least one test electrical circuit closing terminal arranged along a predetermined non-variable direction. Each current conduction path extends along a direction parallel to or coincident with the predetermined non-variable direction. A contacting system is also provided.

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 invention provides a method and a device for judging the health state of a switch type power supply protector by monitoring the discharge spectrum state of a gas discharge tube. The method comprises the following steps: judging the working state of the gas discharge tube according to the cavity color of the gas discharge tube; and when the current state of the gas discharge tube is power frequency follow current, recording a frequency parameter and a duration parameter, and when any parameter exceeds a threshold value, determining that the performance of the switch surge protection device is reduced. The method has the advantages that the problem that the health state monitoring accuracy of the switch type surge protection device is not high is solved, the engineering technology of the monitoring method is very economical, and the health state monitoring accuracy of the switch type surge protection device can be improved to 96% from the highest 60% of the traditional technology.

The invention discloses a half-bridge quick charging circuit of a power type energy storage system and a charger. The circuit comprises an inversion half-bridge module, a transformer module, a first rectification half-bridge module, a second rectification half-bridge module, a first energy storage control module and a second energy storage control module. The output end of the inversion half-bridge module is connected with the input end of the transformer module. The output end of the transformer module is connected with the input ends of the first and second rectification half-bridge modules and the cathode of the power-type energy storage system. The output end of the first rectification half-bridge module is connected with the first ends of the first and second energy storage control modules. The output end of the second rectification half-bridge module is connected with the third end of the second energy storage control module. The second end of the first energy storage control module is connected with the fourth end of the second energy storage control module, and the third end is connected with the power-type energy storage system anode. The second end of the second energy storage control module is connected with the cathode of the power-type energy storage system. According to the circuit, the rising edge and the falling edge of the pulse current are adjusted through the energy storage capacitor, and rapid conversion between a continuous current charging mode and a pulse current charging mode is achieved.

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.

Vehicle charging system comprising: a conductive element configured to couple a charger (38) to a traction battery (24) and having a continuous current carrying capacity below a maximum charging current; characterized by a controller (76) programmed to control a current flow through the conductive element such that a current greater than the continuous current rating is conducted for less than a predetermined time based on an expected temperature increase of the conductive element caused by the current, wherein the current (200) and the predetermined time (206) are selected from a charging current profile, the charging current profile including a plurality of charging currents (200) and associated time values (206) configured to limit a temperature of the conductive element to less than a predetermined temperature.

The invention belongs to the technical field of microwave antennas, and particularly provides a tight coupling phased-array antenna based on a broadband efficient electromagnetic structure. The antenna comprises a broadband matching structure (I) which is an electromagnetic metasurface structure loaded on a broadband efficient electromagnetic structure; the radiation structure (II) is a broadband efficient electromagnetic structure; the feed structure (III) comprises a coaxial line, a gradient microstrip feeder line and a double-Y balun; and a floor (III). According to the invention, the broadband efficient electromagnetic structure is applied to the tightly-coupled antenna, which is equivalent to introduction of three currents in one unit aperture, so that the defect electromagnetic environment that only one current exists in one aperture when a traditional dipole antenna is cut off as an array element is made up, an infinite continuous current sheet model can be better simulated, and the antenna performance is improved. And therefore, a larger bandwidth and a lower profile can be realized. And meanwhile, the wide-angle scanning capability of the array is further improved by introducing the metasurface wide-angle matching.

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 present invention discloses a self-blowing arc-extinguishing graphite gap surge protection device and a surge protector. The surge protection device includes a first electrode, a second electrode, and a self-blowing arc-extinguishing graphite gap structure located between the first and second electrodes; wherein the first electrode and the second electrode are arranged opposite each other and connected to an external circuit; the self-blowing arc-extinguishing graphite gap structure includes two insulating columns arranged oppositely to form an accommodating cavity, a plurality of insulating rings located within the accommodating cavity, and a plurality of graphite electrodes located on the insulating rings; wherein the two insulating columns and the plurality of insulating rings are each provided with an arc-extinguishing cavity, and the arc-extinguishing cavities are connected to form a gas channel to extinguish the arc generated between the graphite electrodes. The present invention provides arc-extinguishing cavities on both the insulating columns and the insulating rings, thereby forming a gas channel through which gas can flow, thereby extinguishing the arc generated by the graphite electrodes. The high continuous current interruption capability of the surge protection device is greatly improved, thereby optimizing the performance of the surge protection device.

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.

The present invention proposes a digital synchronous differential mode conducted electromagnetic interference suppression circuit that can be applied to Boost converters. By means of a half-bridge circuit driven by a synchronous PWM signal of the Boost converter, a circuit is constructed that is in line with the drain-source voltage v DS The waveform shape is the same as that of the compensation voltage v, and the amplitude is proportional to comp , a compensation current is injected through the impedance-matched injection branch to reversely offset the differential-mode conducted electromagnetic interference inside the converter. The present invention can provide a certain amplitude attenuation for the Boost converter in the low-frequency range of 150kHz-2MHz, up to 20dB. The present invention has a simple structure and low cost. When applied to a Boost converter in continuous current mode, the devices used are all small current devices with a very small size and easy integration. When applied to a Boost converter in discontinuous current mode or critical current mode, it is necessary to select a device with appropriate current flow according to the ripple current of the converter power inductor.

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.

The present invention discloses a continuous current monitoring method and system, which relates to the technical field of photovoltaic module performance testing, and includes: S1, modeling, which includes: establishing at least a three-dimensional model of a test cabinet of a photovoltaic current continuity test system; defining the wiring parts of the three-dimensional model based on the real object in a computer, and calculating the real space coordinate parameters of each wiring part to establish a one-to-one correspondence; S2, establishing a test process verification basis, which includes: using a number of smart wearable devices worn on the hands as an operation point calibration mechanism; recording the properties of multiple categories of photovoltaic modules in the computer and assigning identification codes respectively; assigning a test plan to any identification code in the computer and recording it; establishing a communication connection between the computer, which serves as the point calibration mechanism, and the photovoltaic current continuity test system; S3, test execution under monitoring. This application has the effect of making the photovoltaic current continuity test process simpler and the system more convenient to use.

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.