197 results about "Continuous current" patented technology

A multi-battery bidirectional charging and discharging system supporting pulse charging and discharging and a control method thereof belong to the field of power electronics, and the bidirectional charging and discharging system comprises a power factor correction (PFC) stage composed of a three-phase bridge type full-control circuit, a direct current-direct current (DC-DC) converter stage and a plurality of switching device groups. The intermittent characteristic of the pulse charging current is utilized, different battery packs are charged and discharged reasonably and alternately by staggering the conduction interval of the pulse current, the current and voltage fluctuation of the alternating current power supply side in the energy flowing process can be reduced, and the influence of the system on the stability of a power grid or other power supplies is reduced. The invention supports pulse charging and discharging, and can reduce the polarization effect of the battery, prolong the service life of the battery, improve the charging efficiency, reduce hardware equipment required by charging and reduce the cost. The system allows bidirectional flow of energy between the alternating current side and the direct current side of the system, is controllable in power, supports V2G application, and can be used for a scene in which a battery is charged or discharged by using pulse current and continuous current.

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.

The invention discloses an online floating electrochemical scanning and electrospray ionization mass spectrometry combined device, relates to the technical field of analytical chemistry, and can improve the electrochemical detection efficiency and detection accuracy. According to the device, a three-electrode probe is arranged in a reaction cavity and is used for containing a target solution to be detected; the floating type electrochemical controller comprises a high-voltage module, a power supply module, a floating electrochemical measurement and control circuit and a three-electrode probe, the high-voltage module raises the first potential of the floating ground end of the power supply module into a second potential; the power supply module is used for converting the voltage of the floating battery into a preset voltage and then supplying power to the floating electrochemical measurement and control circuit; the floating electrochemical measurement and control circuit is used for controlling the three-electrode probe to output a continuous high-voltage signal or a continuous current signal, the continuous high-voltage signal or the continuous current signal acts on a target solution to generate an electrochemical reaction and directly generate spray ions, and the three-electrode probe is used for detecting voltage and current in the electrochemical reaction process of the target solution; and detection voltage and detection current are obtained.

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 relates to the technical field of electronic power transmission, and provides a power conversion circuit and a power supply system, and the power conversion circuit comprises a transformer which comprises a primary coil and a secondary coil; the primary side interface is used for accessing excitation current; the transformer is configured in the mode that when excitation current is connected to the primary side coil, the secondary side coil generates initial induction current; the secondary side interface is used for outputting induced current; the control unit is connected with the primary coil and the primary interface; the control unit is configured to control the primary side coil to access the excitation current from the primary side interface based on the first control signal; the output unit is connected with a secondary interface of the secondary coil; the output unit is configured to output induced current to the secondary side interface according to the initial induced current, and the induced current is continuous current; the embodiment of the invention is used for reducing the ripple of the output current of the power factor correction circuit (PFC).

The invention relates to a power battery core temperature rapid prediction method and device and electronic equipment, and the method comprises the steps: determining a temperature prediction point location in a power battery; establishing a first temperature response convolution integral calculation model according to the change condition of the heat production rate of the power battery along with the time and the change condition of the temperature of the temperature prediction point location along with the time under the action of the pulse heat source; the pulse heat source acts on the power battery through a pulse current signal to cause heat production of the power battery; according to the first temperature response convolution integral calculation model and the initial temperature of the temperature prediction point location at the initial moment, predicting the temperature of the temperature prediction point location under the action of the actual heat source; the actual heat source is a continuous current signal which acts on the power battery to cause the power battery to generate heat; according to the method provided by the invention, the temperature of the position where the temperature measuring point is difficult to arrange and local high temperature is easy to occur in the power battery module can be quickly and accurately predicted, and the computing resources required by temperature prediction can be reduced.

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.

The invention discloses a discontinuous current type variable duty ratio output resonant gate drive circuit, and belongs to the field of power electronics. The resonant gate drive circuit comprises a PMOS (P-channel Metal Oxide Semiconductor) tube, two NMOS (N-channel Metal Oxide Semiconductor) tubes, an inductor L and a voltage stabilizing capacitor, the on-off states of the PMOS tube and the NMOS tubes are controlled by controlling the time sequence of gate drive signals of the PMOS tube and the NMOS tubes, and inductive current flowing through the inductor is in a discontinuous state. The resonant state of the inductor and the gate capacitor of the driven circuit and the duty ratio of the driving output voltage are further controlled. The inductive current of the circuit is discontinuous, the conduction loss of the circuit is greatly reduced, the grid driving energy recovery ratio is improved, and the duty ratio conversion of the driving signal can be realized by controlling the duty ratio of the driving signal. Therefore, the technical problems that the energy recovery rate is low, the number of control signals is large, signal matching is difficult, the occupied area is large, miniaturization is not facilitated, and the duty ratio cannot be adjusted in the driving technology are solved.

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 invention relates to the technical field of particle radiotherapy, and provides a dose distribution detection device for particle radiotherapy, which comprises a multi-channel current and voltage conversion circuit, an analog-to-digital conversion module, a logic control module, a dose distribution detector and an upper computer, each channel of the dose distribution detector is connected with one channel of the multi-channel current and voltage conversion circuit, each channel of the multi-channel current and voltage conversion circuit is a double-integral architecture circuit comprising two integral modules, and the multi-channel current and voltage conversion circuit is connected with the analog-to-digital conversion module and the logic control module. The analog-to-digital conversion module is connected with the logic control module which is connected with the upper computer. According to the dose distribution detection device, due to the fact that a double-integral structure of the two integral modules is adopted, and the two integral modules are controlled by the logic control module to alternately execute the actions of integral, voltage output and discharging, the continuous current pulse signals of each channel are segmented without dead time, and therefore the counting rate of the dose distribution detection device is increased.

The invention discloses a lightning arrester test system and test method, the test system comprises a test chamber and a conveying mechanism, and the conveying mechanism can convey a to-be-detected lightning arrester to the test chamber and transfer the detected lightning arrester from the test chamber to a designated position; the test chamber comprises a test area and a control room. The test area is internally provided with a test power supply, a lifting assembly, a high-voltage contact grading ring, a composite insulator, a binding post contact cylinder, a power frequency test device, a continuous current test device and a partial discharge test device. The test power supply is connected with the high-voltage contact grading ring through the control circuit; the high-voltage contact grading ring is connected with the lifting assembly through a composite insulator; and the binding post contact cylinder is connected with a control circuit. A control assembly is arranged in the control chamber and can generate a test report according to test data, and the conveying mechanism and the lifting assembly are both connected with the control assembly. According to the lightning arrester test system disclosed by the invention, the working efficiency is improved, and the labor intensity of workers is 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 discloses a connection female head current circulation test system, which comprises a test box, a power supply module, a first temperature detection element, a temperature acquisition module, a voltage acquisition module, a shunt and a control host, and is characterized in that the control host can control the operation of the power supply module, the temperature acquisition module, the voltage acquisition module and the shunt; temperature data acquired by the temperature acquisition module, voltage data acquired by the voltage acquisition module and current data acquired by the shunt are acquired, all the data are summarized, and a data file is automatically generated. The device is reasonable in structural design, can carry out a long-time continuous current cycle test on the female connector, can automatically record test data and generate corresponding data files, saves time and labor, and greatly improves the test efficiency.

A test system (100) for high voltage and high current testing, particularly dynamic high voltage and dynamic high current testing, of power semiconductor devices contained in a wafer (W) is described. The test system (100) comprises a tester, a needle probe card (500) and a contact system (200). The contact system (200) comprises a wafer receiving conductive portion (202) and a test electrical circuit closure contact conductive portion (204). The test electrical circuit closure contact conductive portion (204) of the contact system is shaped and extends to determine respective linear and continuous current conduction paths (A) from each power semiconductor device to at least one test electrical circuit closure terminal (T) disposed in a predetermined non-variable direction (504). Each current conduction path (A) extends along a direction parallel to or coincident with the predetermined non-variable direction (504). The contact system (200) is also described.

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.

A buck converter includes a high-side N-FET, a low-side N-FET, a P-FET, a between a gate terminal and a source terminal of the P-FET, aa capacitor, and a FET driver. The FET driver operates in a selectable one of a continuous current mode and a discontinuous current mode. In a first phase of the discontinuous current mode, a gate voltage on the gate terminal the N-FET equalizes to a source voltage on the source terminal of the N-FET to turn on the first N-FET. A high output voltage on a high-side output of the FET driver is high enough to overcome a threshold voltage of a body diode of the first P-FET to provide the high output voltage minus a threshold voltage to the gate terminal of the high-side P-FET to turn on the high-side P-FET.

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.

A method of operating a silicon controlled rectifier (SCR) is provided. The method may include coupling the SCR to receive an AC voltage signal between an anode and a cathode of the SCR. The method may further include applying a gate current between a gate of the SCR and the cathode, when the AC voltage signal has a first phase angle, corresponding to a first voltage polarity, wherein the SCR switches from an OFF state to an ON state. The method may also include, at a second phase angle of the AC voltage signal, corresponding to a zero voltage cross of the AC voltage signal or to a second voltage polarity, turning off the gate current between the gate and the cathode.

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.