221 results about "Current generator" patented technology

A circuit includes a supply node receiving a supply voltage; an output node providing a regulated voltage; startup circuitry coupled to the supply node; current generator circuitry coupled to the startup circuitry and producing a current; a bandgap node coupled to bandgap circuitry to receive a bandgap voltage; multiplier circuitry coupled to the bandgap node and the current generator circuitry to receive and apply scaling to the current; a first transistor providing a threshold voltage drop across the first and second transistor nodes; a first resistive element interposed between the first transistor and the bandgap node; a second resistive element coupled between ground and the second node of the first transistor; and an operational amplifier receiving a pre-regulated voltage as a function of the bandgap voltage, the threshold voltage across the first transistor, and a voltage drop across the first and second resistive elements.

The invention relates to the field of power system equipment detection, in particular to a residual magnetism measuring device and method for a large power transformer. The residual magnetism measuring device for the large-scale power transformer comprises the large-scale power transformer, a high-voltage bushing, a high-voltage neutral point bushing, a low-voltage bushing, an iron core outgoing line bushing, a first capacitor, a second capacitor, a detection impedor, a partial discharge instrument and a large-current generator, the capacitance of the first capacitor is 30pf-40pf and is matched with the capacitance of a transformer iron core, and the capacitance of the second capacitor is 300pf-400pf and is 10 times proportional to the capacitance of the first capacitor; the method comprises the following steps: carrying out a long-time induction withstand voltage and partial discharge test after a conventional test, measuring discharge amounts Q1, Q2 and Q3 at 0.5, 1 and 1.5 times of rated voltages, judging residual magnetism according to the difference value of the discharge amounts and an iron core grounding current, and if the residual magnetism exceeds the standard, magnetizing and demagnetizing by using a large current generator at the frequency of 150Hz. The method has the advantages that the residual magnetism is measured and evaluated in time, equipment faults are avoided, operation is easy and convenient, and adaptability is high.

The invention discloses a test method for a strain clamp, and the method comprises the steps: carrying out the crimping and drainage plate assembly of the strain clamp, and fastening a bolt on a drainage plate to a preset initial torque value through a digital display torque wrench; measuring the contact resistance of a drainage plate of the strain clamp; arranging a T-shaped thermocouple at a monitoring point position of the strain clamp; sequentially applying currents with different percent calculated current-carrying capacities to the strain clamp through a large current generator, and recording transient temperature rise data corresponding to each monitoring point position; and measuring the contact resistance and transient temperature rise data under different bolt torques under the current of each percentage calculation current-carrying capacity. According to the invention, the actual working state of the strain clamp under different drainage plate assembly conditions can be simulated, the bolt torque of the strain clamp is taken as an independent variable, the contact resistance between the drainage plates under different torques is measured, and the overall temperature distribution of the clamp is measured through the temperature measurement probe, so that the test accuracy is improved. Therefore, real-time measurement of three kinds of data of bolt torque, contact resistance and wire clamp temperature rise is realized.

A system for efficiently generating or originating a tailored electromagnetic (EM) wave having a lower velocity than the speed of electromagnetic waves in free space includes a coaxial waveguide which extends linearly and a sinewave current generator. The coaxial waveguide includes a tubular outer body and a tailored emitting antenna disposed coaxially within the tubular outer body. The tubular outer body is formed of a first conductive material and defines a space therein which may be maintained as vacuum. The tailored emitting antenna is constructed physically and electrically by at least three phase-shifted sub-antennas connected in series, each of the sub-antennas being formed of a second conductive material which is less conductive than the first conductive material. The sinewave current generator generates multiple phase-shifted sinewave currents which are respectively input to the sub-antennas.

The application provides a real-time monitoring device and method for air supplement amount of a Francis turbine unit of a hydropower plant, and relates to the field of Francis turbine units of hydropower plants.The device comprises a thermistor, an air supplement pipe, a current generator, a thermistor temperature sensor, a current regulator and a wind speed regulator, wherein the thermistor is fixed in the middle of the air supplement pipe, and the current generator generates rated voltage to heat the thermistor; the current regulator is used for real-time measurement of output current of the thermistor and records the change frequency of the output current; the wind speed regulator is used for measurement of wind speed at the air supplement pipe opening; and the thermistor temperature sensor is used for measurement of the temperature of the thermistor. The application fixes the thermistor in the air supplement pipe, determines the relationship curve between the air supplement amount and the output current, solves the problem that the air supplement amount of the Francis turbine unit cannot be monitored, and uses the thermistor principle to realize accurate measurement, is durable and not easy to be damaged, is convenient to install, can be introduced into a monitoring system, and can be monitored in real time on a host computer.

The application discloses an elevator braking energy collecting device and relates to the technical field of elevator kinetic energy recovery. The device comprises a braking module installed on the top or bottom of an elevator car; the braking module is in transmission connection with a direct-current generator A arranged on the top or bottom of the elevator car; the end of the direct-current generator A is connected with a CVT gearbox; the braking module comprises a vertically arranged rectangular frame, the opposite two side walls of the rectangular frame are provided with convex columns, the convex columns are rotatably connected with swing arms, the end of the swing arm is rotatably assembled with a mounting shaft through a bearing, the mounting shaft is fitted with a friction roller rolling along the elevator guide rail and a transmission wheel A; a transmission shaft is rotatably arranged between the two convex columns through a bearing, and the transmission shaft is provided with a transmission wheel B in transmission connection with the transmission wheel A. The braking module is arranged on the top and / or bottom of the elevator car to drive the rotation of the direct-current generator A, so that the device can generate electricity in the whole process of the elevator descending.

A current generated cleaning device in accordance with the present invention comprises: a power source, a conductor, a signal generator controller, a current output head, a current generator module, an inlet module, an outlet module, a self-erected water container, and a vertical support frame, the current generated cleaning device use current generated from the current generator module to perform the cleaning and washing of clothes or objects.

The application relates to the technical field of intelligent control of the power generation industry, in particular to a generator set operation index optimization method, device, equipment and medium, which comprises the following steps: inputting multi-source operation data of a current generator set into a preset time sequence prediction model to perform operation parameter prediction, comparing the prediction result with historical optimal operation parameters under corresponding working conditions, generating an operation deviation report, and performing attribution analysis on the operation deviation report based on a preset SHAP algorithm; generating operation index optimization suggestions according to the attribution analysis result, optimizing the operation index of the current generator set, and obtaining the optimized operation index. Thus, the problem that the operation economy and safety of the generator set are poor due to the lack of dynamic prediction, interpretable strategy generation, safety boundary evaluation and experience closed-loop mechanism in the existing power generation technology is solved, dynamic intelligent optimization and safety regulation and control of the operation index of the generator set are realized, and the operation economy and safety are significantly improved.

An activated clotting time measurement apparatus comprising a catheter having first and second lumens inserted into a vascular vessel of a patient and a sensor module. The first and second lumens are connected to a peristaltic pump whereby aliquots of blood is collected from the patient's vascular vessel and delivered to a sensor cartridge in the sensing module by the first lumen via a control valve and uncollected blood is returned to the patient's vascular vessel in the second lumen. The sensor cartridge has a sensing channel, a pair of electrodes, and a clotting activator whereby the aliquots of blood are clotted. A current generator generates current to the electrodes through the clotted blook aliquots where an impedance measurement device measures the electrical impedance caused by the clotted blood and delivers impedance signals to a processor and display device for processing and display.

An anti-fuse circuit includes a current generator and an anti-fuse sensing unit. The current generator has at least one replica electronic element. The anti-fuse sensing unit is electrically connected to the current generator, and the anti-fuse sensing unit has at least one electronic element. The electronic element specification of the at least one electronic element of the anti-fuse sensing unit is the same as the electronic element specification of the at least one replica electronic element of the current generator. The current generator supplies current to the anti-fuse sensing unit to sense the anti-fuse. By means of the technical solution of the present application, the anti-fuse circuit can improve the accuracy of sensing the anti-fuse.

Charging circuitry for charging a bootstrap capacitor that provides a gate drive voltage to a high-side switch of switching circuitry, wherein a first terminal of the bootstrap capacitor receives a variable voltage, the charging circuitry comprising: current source circuitry configured to supply a charging current to the bootstrap capacitor; a charging switch for selectively coupling the current generator circuitry to the bootstrap capacitor to permit charging of the bootstrap capacitor by the current generator circuitry; and control circuitry configured to control operation of the charging switch to charge the bootstrap capacitor to at least a predefined target voltage, wherein the predefined target voltage is referenced to the variable voltage.

The application discloses a kind of fully closed sodium alginate capsule forming device, including fixed body, fixed body is connected with positioning body by screwing or welding mode on it, the front end surface of the fixed body is connected with forming cavity by screwing or welding mode, the bottom of the forming cavity is fixedly connected with processing cavity, the forming cavity is communicated with processing cavity, the bottom of the processing cavity is fixedly provided with magnetic stirrer;High-voltage direct-current generator is fixedly provided on the forming cavity, the fixed cavity is connected with the inner wall of the forming cavity by screwing or welding mode, the fixed cavity is provided with communication pipe, and the communication pipe is communicated with the liquid guide device;Flow guide plate is fixedly provided in the processing cavity, the flow guide plate is connected with the inner wall of the processing cavity by sliding mode, and positioning plate is fixedly provided below the two sides of the flow guide plate, hydraulic lifting cylinder is fixedly provided between the positioning plate and the flow guide plate, and flow guide hole is formed in the flow guide plate.

The invention belongs to the field of fault protection of a high-voltage direct-current generator controller, and particularly relates to a software design method for excitation positive short circuit of a generator controller, which comprises the following steps of: setting excitation protection conditions, and when the frequency of a permanent magnet machine is greater than or equal to a network casting rotating speed, a voting unloading signal is network casting permission and a control command of a main contactor is switched on; when the excitation protection condition is met, an excitation over-ground short circuit fault protection mark is set, excitation is removed, and the main contactor is switched off; when it is detected that the excitation positive voltage is normal for a first continuous number of times, eliminating the excitation positive voltage abnormal count and the excitation over-ground short circuit fault mark; and if the frequency of one beat of the permanent magnet machine is smaller than the network casting rotating speed or the voting unloading signal is unloading or the main contactor control command is disconnection, clearing the excitation positive voltage abnormal count, the excitation positive voltage jump count and the excitation over-ground short circuit fault mark. And the continuous short circuit or intermittent short circuit fault of the excitation positive voltage can be accurately identified.

The invention discloses an electric power system control method and system based on adversarial training and terminal equipment thereof, and belongs to the field of electric power systems. Updating the discriminator based on the generated track set; obtaining a current state-action value function; updating the generator based on the approximate expert strategy probability and the current state-action value function; when the preset training target is not met, repeatedly executing an interaction action based on the current generator and the current discriminator, and obtaining a correction generator and a correction discriminator which meet the preset training target; obtaining a Markov agent based on the correction generator and the correction discriminator; actual operation data of the power system are obtained in real time, and a prevention and control strategy of the power system is obtained based on the Markov agent and the actual operation data. According to the adversarial training-based power system control method and system and the terminal equipment thereof disclosed by the invention, efficient and stable acquisition of a prevention and control strategy in dynamic operation of the power system is realized.

The utility model relates to the technical field of alternating-current generator structures, in particular to an alternating-current generator structure which comprises a machine core, a front end cover and a rear end cover, the front end cover and the rear end cover are spliced in a front-back mode and arranged on the periphery of the machine core in a wrapping and sleeving mode, and a front protective cover close to the front side of the front end cover is installed and connected on the peripheral side face, close to the outer side, of the front end cover. A rear protective cover close to the rear side of the rear end cover is installed and connected to the peripheral side face of the rear end cover, and the front protective cover comprises a fan-shaped front plane protective plate perpendicular to the axial direction of the generator and an arc-shaped front curved surface protective plate integrally connected to the rear side edge of the front plane protective plate. The rear protective cover comprises a fan-ring-shaped rear plane protective plate perpendicular to the axial direction of the generator and an arc-shaped rear curved surface protective plate integrally connected to the front side edge of the rear plane protective plate, the bending direction of the front curved surface protective plate and the bending direction of the rear curved surface protective plate are consistent with the circumferential direction of the generator, heat dissipation is good, and use is flexible.

A contactless power feeding facility includes a coupling unit electromagnetically coupling a target feeder line and an adjacent feeder line. A target power supply apparatus includes: a phase detector detecting the induced current phase which is the phase of an induced current flowing through the target feeder line by the electromagnetic induction via the coupling unit while an alternating current is supplied to the adjacent feeder line by an adjacent power supply apparatus; an alternating-current generator generating the alternating current to be supplied to the target feeder line; and a phase controller controlling the alternating-current generator such that the phase of the alternating current to be supplied to the target feeder approaches the induced current phase detected by the phase detector.

The application provides a control method and device of a vehicle range extender system, a storage medium and an electronic device. The method comprises: obtaining a motor speed regulation capability of a generator corresponding to a current working condition, the motor speed regulation capability representing a time for regulating a current generator speed to a target speed; determining a maximum range extender power generation power as an optimization target and the motor speed regulation capability as a constraint condition, the maximum range extender power generation power being a maximum value of power generation power of the vehicle range extender system; determining corresponding target engine efficiency and target generator efficiency according to the maximum range extender power generation power, and controlling the engine to work according to the target engine efficiency and the generator to work according to the target generator efficiency, so that fuel consumption of the vehicle is less than a preset fuel consumption. The method improves the economy of the range extension system based on the engine target torque at different speeds when the PTO is powered off-line, and improves the economy of the range extension system within the allowable range of the motor speed regulation capability.

The application discloses a short-circuit recovery voltage limiting method for a three-stage direct-current generator, which detects output voltage U0 of the three-stage direct-current generator and load current i L to determine the state of the load, adjusts the output state of the three-stage direct-current generator according to the state of the load by using an asymmetric half-bridge excitation topology, detects the generation output voltage and the load current to determine characteristic states such as a short-circuit state, a short-circuit recovery state and a first voltage peak falling edge after short-circuit recovery, and closes upper and lower excitation power tubes in combination with the asymmetric half-bridge during short-circuit recovery, so that the two power tubes are opened only when the first voltage peak falls to a voltage undervoltage value after short-circuit recovery, and voltage overshoot during short-circuit recovery of the three-stage direct-current generator is limited to the maximum extent, and the safety of a power supply system is ensured.

A control circuit for a current source converter having a current generator comprising an inductance and having two or more half bridges, each half bridge having an upper leg provided with upper switching devices and a lower leg provided with lower switching devices, the upper leg switching devices and the lower leg switching devices being controlled by a controller to provide overlap between upper leg off switching devices and upper leg on switching devices and to provide overlap between lower leg on switching devices and lower leg off switching devices by gate pull-up and pull-down pulse signals input to gate driver buffers of the switching devices, characterized in that the gate driver circuit comprises: - a gate current mirror circuit for each upper leg switching device and each lower leg switching device, the gate current mirror circuit providing a gate pull-down signal on a source branch of the gate driver buffer of the switching device when the switching device is off, the gate pull-down signal being connected to a control line of a gate buffer of a respective other upper leg switching device or other lower leg switching device, - a positive gate command connection path from a positive gate command output of a pre-driver for each upper leg switching device and each lower leg switching device, the positive gate command connection path providing a reset signal for the gate pull-down signal of the respective other upper leg switching device or respective other lower leg switching device.

High-swing push-pull assisted Voltage Mode Logic (VML) driver circuits can enhance output voltage amplitude to improve efficiency and performance in electronic applications. For example, this is accomplished by utilizing a primary current generator circuit that is powered by a supply voltage to generate a primary current. The primary current is provided, through a switching circuit, to an output node that, in response to an input signal, generates a first output voltage. Further, a supplementary current generator circuit is coupled to the switching circuit to generate a secondary current. The combination of the primary and secondary currents increases the amplitude of the first output voltage, thereby enabling the VML driver circuit to deliver enhanced performance, particularly in applications requiring precise voltage control and high efficiency.

The invention discloses an integrated impedance measurement system adaptive to a biological signal acquisition front end. The integrated impedance measurement system comprises a sine wave current generator, a band-pass filter, an amplifier module BPFA, a multiplexer and an analog-to-digital converter ADC which are communicated in sequence, the sine wave current generator is used for generating low-amplitude alternating current for measuring tissue-electrode impedance, and the alternating current acts on a measured electrode to generate corresponding alternating voltage; the band-pass filter and amplifier module BPFA is used for amplifying and filtering the AC voltage; an analog-to-digital converter (ADC) receives the amplified and filtered alternating voltage through a multiplexer to perform digital signal conversion, and tissue-electrode impedance measurement of the measured electrode acting on the tissue is completed; according to the invention, the amplitude of the AC voltage is controlled to accurately adapt to the + / -5mV input range of the existing acquisition front end, and the amplification and filtering modules are directly multiplexed to complete impedance signal processing without additionally configuring a special analog front end for impedance measurement, so that the integration level and the stability of a chip are improved.

A display apparatus includes a display panel including pixels, a timing controller configured to generate current mirror control information, based on an amount of transition of image data to be written in the pixels, and an output circuit configured to output a target data voltage, corresponding to the image data, to a data output channel connected to one of the pixels, wherein the output circuit includes a mirroring current generator configured to generate a mirroring current and an amplifier circuit including a pull-up transistor including a gate electrode connected to a first control node, a first current mirror configured to supply the mirroring current to the first control node according to the current mirror control information, a pull-down transistor including a gate electrode connected to a second control node, and a second current mirror configured to supply the mirroring current to the second control node.

The invention discloses a pipeline cathode protection detection device. Comprising a square wave current generator, a differential voltage sensor, a band-pass filter and a controller, the square wave current generator is electrically connected with the pipeline and is used for outputting square wave current to the pipeline; the differential voltage sensor is arranged in the pipeline and is used for acquiring a real-time pipe wall axial voltage difference of the pipeline; the band-pass filter is electrically connected with the differential voltage sensor and is used for filtering the real-time axial voltage difference of the pipe wall; and the controller is electrically connected with the band-pass filter and is used for acquiring the real-time pipe wall axial voltage difference filtered by the band-pass filter and determining the current information of the pipeline according to the acquired real-time pipe wall axial voltage difference. According to the pipeline cathode protection detection device, detection of pipeline cathode protection is achieved, and the influence of noise and strong interference current on pipeline cathode protection detection can be reduced.

The application provides an omnidirectional water wave energy collection and generation device and an array generator set, and belongs to the field of water power generation. The omnidirectional water wave energy collection and generation device and the array generator set comprise a collecting end, a power generation end and a bottom plate, the collecting end comprises a floating ball, a connecting rod and a first universal joint mechanism fixedly arranged on the bottom plate, a transmission assembly, a longitudinal water pump unit and a transverse water pump unit, and the power generation end is a water current generator. The omnidirectional water wave energy collection and generation device and the array generator set provided by the embodiment of the application can collect transverse and longitudinal water wave energy through the floating ball, the universal joint mechanism, the transmission assembly, the longitudinal water pump unit and the transverse water pump unit, thereby driving the water current generator to generate power, and the collection and utilization of transverse water wave energy and longitudinal water wave energy can be realized. The utilization rate of water wave energy by the water wave energy collection and generation system is improved, and the problem of low water wave energy collection efficiency in the prior art can be effectively solved.

The utility model belongs to the field of meteorological measurement, and relates to a micro-current calibration device of an air negative ion observation instrument, which comprises a standard micro-current generating device used for generating standard micro-current signals with different intensity grades (the standard micro-current signals can be traced to the international unit system); the device comprises a standard micro-current generating device, a probe which is connected with the standard micro-current generating device into a whole and is used for being connected with a negative ion observation instrument to be calibrated so as to input standard micro-current with different intensity grades output by the standard micro-current generating device into an acquisition board of the negative ion observation instrument, and a calculation unit which is used for calculating the standard micro-current with different intensity grades output by the standard micro-current generating device. And the standard micro-current generator is arranged in the standard micro-current generator and outputs a correction parameter for calibrating the output value of the negative ion observation instrument. Therefore, calibration of the negative ion observation instrument is realized. According to the utility model, a unified and traceable calibration method is provided for the negative ion observation instrument, the accuracy and comparability of observation data are improved, and the accuracy and reliability of observation results are ensured.

An apparatus, including: a current generating circuit configured to generate a first current; a first current mirror including a first field effect transistor (FET) and a second FET, wherein the first FET is coupled to the current generating circuit such that the first current flows through the first FET; a first switching device coupled between a gate of the first FET and a gate of the second FET; and a capacitor coupled between a first voltage rail and the gate of the second FET.

An optical scanning device includes: a scanner that includes multiple light-emitting element sets, the multiple light-emitting element sets being arranged in a main scanning direction so as to face a subject to be scanned and being each constituted by multiple light-emitting elements arranged in the main scanning direction, and that scans the subject by causing each of the multiple light-emitting element sets to emit light based on image information; a driver that drives each of the multiple light-emitting element sets for each scanning period; and a discard-current generator that generates a discard current which is to flow from the driver during a non-scanning period which is set between the scanning periods, the discard current being different from a current to flow to each of the multiple light-emitting element sets, and that also controls the generated discard current.

A control circuit for a feed-forward equalizer (FFE) includes an FFE controller and an impedance control loop. The FFE has a plurality of tap drivers commonly coupled to an output terminal. The FFE controller, which receives a basic current from a current generator, includes a current digital-to-analog converter (DAC) and a current mirror. The current DAC generates a reference current according to the basic current. The current mirror mirrors the reference current to generate at least one first reference voltage, and outputs the at least one first reference voltage to at least one first tap driver among the plurality of tap drivers. The impedance control loop, coupled to the FFE controller, generates a second reference voltage according to the at least one first reference voltage, and outputs the second reference voltage to at least one second tap driver among the plurality of tap drivers.

The invention discloses an electric power system static voltage stability prevention and control method and device, terminal equipment and a storage medium, and belongs to the technical field of electric power system stability control, and the method comprises the steps: obtaining the current generator active output, terminal voltage, reactive compensation, line load, node voltage and node power of an electric power system; inputting the active output, the terminal voltage, the reactive compensation and the line load of the generator into a preset load margin prediction model constructed based on a convex neural network to obtain a first load margin prediction value; inputting the first load margin predicted value, the node voltage and the node power into a preset voltage stability control model to obtain a current control decision parameter of the power system; and finally performing voltage stability control on the power system according to the control decision parameter. By implementing the method, the problems of complex calculation and low solving efficiency of a method for formulating a control strategy by iteratively solving non-convex nonlinear constraints in the prior art can be solved.

The invention discloses a direct-current charging pile based on a novel direct-current generator and a control method, and relates to the technical field of direct-current charging piles, the direct-current charging pile comprises a direct-current generator set, a direct-current power generation controller, a direct-current charging controller, a direct-current charging gun, a touch screen and a 12VDC power supply, comprising an engine, an integrated starting generator, a generator control unit and a power distribution unit, the direct-current power generation controller achieves the functions of charging starting and stopping, output parameter adjustment, protection control and the like, and the direct-current charging controller achieves the functions of communication interaction with a vehicle BMS and charging guide control. The direct-current generator set is used for replacing a traditional alternating-current generator set, a direct-current charging gun is reserved, the generator control unit is used for replacing an AC-DC module to be integrated into the direct-current generator set, a direct-current power source is directly output, and under the same output power, the advantages of being small in size and light in weight are achieved; the goals of stable voltage, accurate power matching and in-place safety protection are achieved.