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34results about How to "Work status impact" patented technology
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High efficiency energy saving electromechanical hybrid stepless gear
InactiveCN1563743AAvoid disadvantagesWork status impactGas pressure propulsion mountingToothed gearingsEngineeringClutch
The variable shift gear is composed of three coaxial planetary system, two motors, one controller, two power transmitting shaft and at least two clutches, each planetary system is comprised of at least three coaxial rotary components. The three planetary systems coupled into the five-branch system. The first branch is connected with the motor, the fifth branch is connected with the second motor, the third branch is connected with the first power transmitting shaft. The second shaft is selectively connected with the second or fourth branches. The two motors are conected electrically by controller and can transmit electric energy with each other.
Owner:SHANDONG LIANCHENG GREENMAX TECH
Power transformer running state real-time monitoring method based on power consumption detection
InactiveCN107132437AReal response to running statusOperational state responseElectrical testingPower measurement by current/voltagePower flowTransformer
The invention discloses a power transformer running state real-time monitoring method based on power consumption detection, and belongs to the technical field of power transformer safety running. The method of the invention is characterized by comprising a monitoring system and including a step 1001 of obtaining current and voltage signals of a power transformer; a step 1002 of obtaining input end active power and output end output power; a step 1003 of obtaining a normal power consumption value; a step 1004 of obtaining a power deviation percentage; a step 1005 of executing a step 1006 if being in a serious state, and executing a step 1007 otherwise; the step 1006 of sending out a tripping command; the step 1007 of executing a step 1009 if being in an abnormal state, and executing a step 1008 otherwise; the step 1008 of executing the step 1009 if running in a critical state, and executing a step 1010 otherwise; the step 1009 of sending out an alarm signal; and the step 1010 of continuing running. The power transformer can be evaluated in the actual running, and the reliability is substantially improved.
Owner:山东汇能电气有限公司
High-frequency power amplifier
InactiveCN1744430ANo loss of functionHigh performance workHigh frequency amplifiersAmplifier combinationsHigh frequency powerAudio power amplifier
Owner:PANASONIC CORP
Method of controlling power-on of multi-node server system
InactiveCN106774763AWork status impactImprove usabilityVolume/mass flow measurementPower supply for data processingElectricityControl power
The invention discloses a method of controlling power-on of a multi-node server system and relates to the field of universal server power supply; the method comprises: setting a logic 'AND' processing unit on a system medium plate of the multi-node server system, subjecting power-on EN signals of a plurality of server nodes to logic 'AND' operation, outputting a system power-on EN signal SYS_EN, using the signal SYS_EN to enable the control of P12V output of a PSU (power supply unit) so as to control power-on of the server nodes. Power-on or power-off action is done for any one or more server nodes in a four-component server system according to the method, working state of other server nodes may not be affected, and high availability and reliability of the system are guaranteed.
Owner:ZHENGZHOU YUNHAI INFORMATION TECH CO LTD
FPGA (field programmable gate array)-based method for implementing ship-navigation radar transmitting and receiving system
InactiveCN104215940ASimple designImprove work performanceWave based measurement systemsSystems designIntermediate frequency
The invention discloses a method for implementing a ship-navigation radar transmitting and receiving system. The method includes a transmitting aspect and a receiving aspect. An FPGA (field programmable gate array)-based process for controlling a ship-navigation radar transmitter is provided in the transmitting aspect, trigger pulses are generated via an FPGA, are transmitted through a buffer-stage circuit and a driving circuit and then are boosted to obtain pulsed high voltages by a pulse transformer, the pulsed high voltages are supplied for a magnetron, and radar electromagnetic waves are transmitted by the magnetron at corresponding frequencies. A ship-navigation radar intermediate-frequency digital module which can be directly connected with the FPGA is implemented in the receiving aspect, circuits of a logarithm amplifier, the buffer-stage circuit, an analog-to-digital conversion circuit and the like are integrated via reasonable circuit layout and shielding structures to obtain the module, analog intermediate-frequency signals of a radar radiofrequency receiver can be converted into digital signals by the module, and the digital signals can be outputted to the FPGA by the module. The method has the advantages of large dynamic range, high sensitivity, compact circuits, simplicity in debugging and the like. Besides, owing to the method for implementing the transmitting and receiving system, the ship-navigation radar transmitting and receiving system is compact in design and easy to implement, and the radar cost performance can be improved.
Owner:南京信大电子科技有限公司
Annular temperature sensor
ActiveCN109341880AAccurate temperature measurement accuracyEliminate crosstalkThermometers using electric/magnetic elementsSolid-state devicesPhysicsAnode
The invention discloses an annular temperature sensor which is used for measuring temperature of a transistor. The temperature sensor comprises: an annular P-type heavily doped region, an annular N-type heavily doped region, an annular anode, an annular N well region and an annular P well region which are sequentially arranged in the active region of the transistor in an inside-out order; and an annular cathode arranged in the annular N-type heavily doped region; wherein the annular cathode is shorted to source of the transistor.
Owner:INST OF MICROELECTRONICS CHINESE ACAD OF SCI
Dowty retarder real time monitoring system and method based electromagnetic induction
InactiveCN108426608ARealize real-time online monitoringDiscovered in timeMeasurement devicesWireless transmissionMonitoring system
The invention discloses a dowty retarder real time monitoring system and a method based electromagnetic induction. The device comprises an electromagnetic induction module. The electromagnetic induction module is used for detecting an electromotive force generated by the sliding oil cylinder of the dowty retarder when a train passes; the voltage data output by the electromagnetic induction moduleis sequentially transmitted to a voltage amplification filter module and an analog-to-digital conversion module for processing. The analog-to-digital conversion module converts the data into a digitalsignal and then transmits the data to a monitoring platform through a wireless transmission module. A monitoring platform judges the working state of the dowty retarder according to the electromotiveforce generated by the electromagnetic induction module. The real-time and on-line monitoring of the dowty retarder in the hump speed regulation system of the railway marshalling station can be realized. The dowty retarder with problem can be found in time. The occurrence of accidents can be reduced and the efficiency is improved.
Owner:SHANDONG UNIV
Automatic plate rolling device for corrugated carton printing machine
ActiveCN111016426AWork status impactRotary lithographic machinesPrinting press partsGear driveGear wheel
The invention discloses an automatic plate rolling device for a corrugated carton printing machine. The device comprises a printing roller, a limiting sleeve and a driving box, a shaft groove is formed in the printing roller, a plate hanging shaft is rotationally connected into the shaft groove, the surface of the printing roller is coated with an offset plate, a center shaft is fixedly inserted into the printing roller in a penetrating mode, a plate hanging gear is fixedly inserted into one end of the plate hanging shaft in a penetrating manner, the limiting sleeve is rotationally arranged ona printing machine frame, the driving box is fixed to the printing machine frame, a driving motor is fixedly installed in the driving box, an output end of the driving motor is fixedly connected withan output shaft, a driving gear is fixedly inserted into the output shaft in a penetrating mode, and first threaded shafts are symmetrically and rotationally connected to the inner wall of the driving box. The printing roller is rotated by 90 degrees through the printing machine, the plate hanging gear revolves around a plate rolling gear, and due to the meshing effect of the printing roller andthe plate rolling gear, the plate hanging gear drives the plate hanging shaft to rotate, so that the offset plate is automatically rolled and locked.
Owner:珠海市科立包装制品有限公司
Method for measuring Bohr resonance phase difference and modifying data through continuous photographing or camera shooting
InactiveCN104019801AAvoid influenceImprove thinking skillsSubsonic/sonic/ultrasonic wave measurementPicture taking arrangementsElectronic circuitTime difference
The invention discloses a method for measuring Bohr resonance phase difference and modifying data through continuous photographing or camera shooting, relates to the field of physical experiment parameter measurement, and discloses an experiment method which takes the place of a method for measuring phase difference by stroboflash. According to the technical scheme, a scale ruler is suspended between a balance wheel and a rocker, wherein the scale ruler takes the shape of an arc with angle scales; a balance wheel pointer is fixed on the balance wheel; when Bohr resonance forced vibration is in a stable state, the relationship between the balance wheel and the rocker in Bohr resonance forced vibration is recorded through continuous photographing or camera shooting; the time difference delta T generated when the balance wheel pointer and a rocker pointer point to one same scale on the scale ruler, and the swinging period T are confirmed through a computer according to the photographing time of a picture or the time interval of frames of camera shooting, and the phase difference is 360o*delta T / T; linear interpolation is adopted for modifying data when the balance wheel pointer and the rocker pointer cannot point to one same scale. The method has the beneficial effects that the influence of large current on the working state of an electronic circuit is avoided, and the method is an improvement of the prior art.
Owner:SICHUAN UNIV
An automatic plate rolling device for a corrugated box printing machine
ActiveCN111016426BWork status impactRotary lithographic machinesPrinting press partsGear wheelCarton
The invention discloses an automatic plate rolling device for a corrugated box printing machine, which comprises a printing roller, a limit sleeve and a driving box. A shaft groove is opened on the printing roller, and a plate hanging shaft is rotatably connected in the shaft groove. The surface of the printing roller is covered with an offset plate, the printing roller is fixedly interspersed with a central shaft, and one end of the hanging shaft is fixedly interspersed with a hanging gear, and the limiting sleeve rotates on the frame of the printing machine. The box is fixed on the frame of the printing machine. A drive motor is fixedly installed in the drive box. The output end of the drive motor is fixedly connected with an output shaft, and a driving gear is fixedly interspersed on the output shaft. The inner wall of the drive box The symmetrical rotational connection has a first threaded shaft. In the present invention, the printing roller is rotated by 90 degrees through the printing machine, and the plate-hanging gear revolves around the roll-up gear. Due to the meshing effect of the two, the plate-hanging gear drives the plate-hanging shaft to rotate, thereby automatically locking the offset plate. .
Owner:珠海市科立包装制品有限公司
Optical sliding mouse possessing rolling ball
InactiveCN1475965AWork status impactGraph readingMechanical pattern convertionLight beamComputational physics
An optical slide mouse with rolling ball is composed of a shell with a planar bottom having the first opening, a ball in said shell, and a light source in the shell for generating light beam to irradiate said ball, and a control circuit in the shell and having an optical recognizing unit for recognizing the change in reflected light of ball.
Owner:PRIMAX ELECTRONICS LTD
Method of Measuring Bohr Resonance Phase Difference Using Photogate
The invention provides a method for measuring a Pohl resonance phase difference by using photogates and relates to the field of physical experiment parameter measurement. The method replaces a stroboscopic method for measuring the Pohl resonance phase difference. According to the technical scheme, a rocker light blocking piece is fixed to the top of a rocker of a Pohl resonance instrument, a swing wheel light blocking piece is fixed to the upper end of a swing wheel, the swing wheel light blocking piece and the rocker light blocking piece can both pass through the interval photogate in the swing process, and the interval photogate is made to start timing or stop timing. The swing wheel light blocking piece or the rocker light blocking piece passes through the cyclic photogate in the swing process. After forced vibration is stabilized, the time difference delta T of the swing wheel light blocking piece and the rocker light blocking piece arriving at the same position is measured through the interval photogate, the swing cycle T is measured through the cyclic photogate, and the phase difference is 360-degree*delta T / T. The method for measuring the Pohl resonance phase difference by using the photogates has the advantages that a flash lamp is not used, and thus the influences of large currents on the working state of an electronic circuit are avoided; the method for replacing the stroboscopic method for measuring the phase difference is proposed, and the prior art is enriched.
Owner:SICHUAN UNIV
Electronic execution unit working state self-holding protection circuit and system
The invention discloses an electronic execution unit working state self-holding protection circuit and system. The self-holding protection circuit comprises an electronic execution unit working statesignal end, at least two logic signal input ends of the self-holding protection circuit, a logic operation circuit used for carrying out logic operation output on at least two logic input signals anda trigger circuit. By means of the logic operation circuit and the trigger circuit, the working state of the electronic execution unit working state signal end is not influenced when a microcontrolleris subjected to multiple transient anomalies. Even if an output signal of the microcontroller is abnormal, the working state of an execution unit is not influenced. When the microcontroller returns to normal, the working state of the current execution unit can be identified, and a correct control instruction is continuously given.
Owner:智新控制系统有限公司
Temperature-controlled type range hood
InactiveCN107957084AImprove smoke absorption abilityImprove smoke absorption rateDomestic stoves or rangesLighting and heating apparatusEngineeringSurface plate
The invention discloses a temperature-controlled type range hood, and belongs to the technical field of household appliances. The temperature-controlled type range hood comprises a front panel 1, a smoke guiding plate 2, a filter screen 3, an oil guiding plate 4, a first fan 5, a second fan 6, a smoke exhaust port 7, an oil groove 8 and a control box 13; and the front panel 1 is arranged at the front end of the temperature-controlled type range hood, the smoke guiding plate 2 is embedded on the front panel 1, the inner side of the smoke guiding plate 2 is provided with a filter screen 9 and alighting device 10, the inner side of the front panel 1 is provided with the filter screen 3 and the oil guiding plate 4, the upper side of the filter screen 3 is provided with the first fan 5, the rear side of the first fan 5 is provided with the second fan 6, the lower end of the second fan 6 is provided with the control box 13, and the oil groove 8 is formed in the lower portion of the controlbox 13. The temperature-controlled type range hood is characterized in that the inner side of the smoke guiding plate 2 is provided with the filter screen 9 and the lighting device 10, the oil groove8 is internally provided with a temperature-sensitive device 11, the upper end of the temperature-sensitive device 11 is provided with a control switch 17, the smoke exhaust port 7 is provided with asmoke exhaust fan 12, and shock-absorbing and sound-absorbing materials 16 are arranged around the first fan 5 and the second fan 6. The temperature-controlled type range hood has the excellent oil smoke absorbing effect.
Owner:闫博文
Stepless adjustable great current generating circuit for driving electromagnetic performer
InactiveCN101231905BImprove reliabilityWork status impactElectromagnets with armaturesCircuit reliabilityIndustrial Accident
The invention discloses a stepless adjustable heavy current generation circuit used for driving an electromagnetic actuator, which comprises a processor, a digital-analog converter, a voltage comparator, an isolated-form power tube driver, an isolated-form operational amplifier, a current sample module and an insulated gate bipolar transistor. The processor is connected with the digital-analog converter; the digital-analog converter is connected with the voltage comparator; the voltage comparator is connected with the isolated-form power tube driver; the isolated-form power tube driver is connected with the insulated gate bipolar transistor; the isolated operational amplifier is connected with the voltage comparator; the current sample module is connected with the isolated operational amplifier, and is connected with the positive input end of the electromagnetic actuator; the collector input end of the isolated gate bipolar transistor is connected with the reverse input end of the electromagnetic actuator. The invention has the advantages of high circuit reliability to prevent industrial accident, convenient set of the driving current value and accurate and reliable stepless adjustment.
Owner:SOUTHEAST UNIV
Method for measuring Pohl resonance phase difference by using digital oscilloscope
The invention provides a method for measuring a Pohl resonance phase difference by using a digital oscilloscope and relates to the field of physical experiment parameter measurement. The method for replacing a stroboscopic method for measuring the phase difference is proposed. According to the technical scheme, a swing wheel and a rocker are respectively and fixedly provided with a touch jaw which is in a 7 shape; soft conductor wires are suspended above the swing wheel and the rocker respectively; the swing wheel swings to the position where the touch jaw touches the corresponding soft conductor wire, a circuit is made to be connected to a power source, a pulse voltage is output at an open circuit end, and open circuit voltages generated due to connection at the upper end of the swing wheel and the upper end of the rocker are connected to the an X input port and a Y input port of the double-tracking digital oscilloscope respectively; an input signal is obtained through a time measurement tool of the digital oscilloscope, a vibration cycle T is measured on an oscilloscope display screen, the time interval delta T between the high levels of two signals is measured, and when the delta T is smaller than T / 2, the phase difference is 360 degrees*delta T / T. The method for measuring the Pohl resonance phase difference by using the digital oscilloscope has the advantages that the influences on the working state of an electronic circuit of a large current instrument are avoided, and the prior art is expanded.
Owner:SICHUAN UNIV
Slag removing method for cast-welding machine
InactiveCN106541111AWork status impactIncrease the lengthCasting cleaning apparatusSlagPulp and paper industry
The invention relates to the field of cast-welding machines and particularly relates to a slag removing and driving assembly for a cast-welding machine. The slag removing and driving assembly is composed of a slag removing part and a driving plate assembly mounted on the slag removing part; the driving plate assembly is composed of a driving plate and two groups of driving plate supporting columns mounted at the end parts of the driving plate; and the other ends of the driving plate supporting columns are also provided with heat insulation plates arranged at the upper side of the driving plate. Due to the arrangement of the heat insulation plates and the driving plate supporting columns, heat in a framework can be prevented from being conducted towards an air cylinder and the outside, and the working state of the air cylinder cannot be affected; in addition, the condition that the service life of a sealing ring of the air cylinder is shortened by the heating of the air cylinder can be effectively avoided because the lengths of a slag removing guide post and a slag removing air cylinder connecting rod are increased.
Owner:WUXI QIZE MACHINERY TECH
Angle-adjustable heat dissipation dustproof monitor
PendingCN114338982AWork status impactGuaranteed uptimeTelevision system detailsDispersed particle filtrationControl engineeringSurveillance camera
Owner:JINCHUAN GROUP LIMITED
Indoor dust suppression device for construction site
PendingCN110394009AWork status impactIncrease the areaUsing liquid separation agentSuction nozzlesWater storageEngineering
The invention belongs to the technical field of building equipment and particularly relates to an indoor dust suppression device for a construction site. In view of the problem that the existing devices are not comprehensive enough during indoor dust suppression, a scheme as follows is proposed at present: the indoor dust suppression device comprises a shell, wherein a partition plate is fixedly connected to a bottom end, between internal walls of two sides, of the shell, the shell is divided into a water storage chamber located at the top end of the partition plate and a dust suction chamberlocated at the bottom end of the partition plate by the partition plate, the bottom end of the partition plate is fixedly connected with a negative-pressure blower, a framework is fixedly connected tothe shell between internal walls of two sides of the dust suction chamber and is located below the negative-pressure blower, and an opening is formed in the middle part of the framework. According tothe indoor dust suppression device for the construction site, through arranging the negative-pressure blower and an isolating pad, negative pressure can be generated through the negative-pressure blower, so that dust on the ground can be sucked into the dust suction chamber from a dust suction port; and meanwhile, the isolating pad is required to be bedewed with water before using the device, sothat the dust will be blocked by the isolating pad when the dust enters the dust suction chamber, and an operating state of the negative-pressure blower cannot be affected by the dust.
Owner:中建河图建设有限公司
Emergency stop devices with securely mounted switch assemblies
ActiveCN111640609BWork status impactProtect personal safetyOperation facilitationElectric switchesEngineeringStructural engineering
Owner:FUJIAN SANXING ELECTRIC
Deepwater drilling riser
InactiveCN110242226AThere will be no loosenessImprove the safety of useDrilling rodsDrilling casingsWell drillingDeepwater drilling
The invention belongs to the technical field of drilling risers, and discloses a deepwater drilling riser. The deepwater drilling riser comprises a first pipe body and a second pipe body, the first pipe body is provided with a connecting device, the connecting device comprises a first joint and a second joint, the first pipe body and the second pipe body are both provided with stress blocks, a groove ring block is mounted at the bottom of the first pipe body, the second pipe body is connected with the groove ring block in a clamping mode, the first joint is provided with a bolt, and the first joint is fixedly connected with the second joint through the bolt. According to the deepwater drilling riser, a drilling riser connecting structure is arranged, the structure is simple, the sealing performance is high, environments inside and outside the pipe body can be effectively isolated, thus the work state in the pipe body cannot be influenced, the fastness of the structure is high, stability and reliability are achieved, connection of the risers cannot loose, the using safety of the riser is improved, mounting of the connecting structure is simple, and large amount of labor can be saved.
Owner:重庆诺登液压机械制造有限公司
Real-time monitoring system and method for decelerator based on electromagnetic induction
InactiveCN108426608BRealize real-time online monitoringDiscovered in timeMeasurement devicesWireless transmissionMonitoring system
The invention discloses a dowty retarder real time monitoring system and a method based electromagnetic induction. The device comprises an electromagnetic induction module. The electromagnetic induction module is used for detecting an electromotive force generated by the sliding oil cylinder of the dowty retarder when a train passes; the voltage data output by the electromagnetic induction moduleis sequentially transmitted to a voltage amplification filter module and an analog-to-digital conversion module for processing. The analog-to-digital conversion module converts the data into a digitalsignal and then transmits the data to a monitoring platform through a wireless transmission module. A monitoring platform judges the working state of the dowty retarder according to the electromotiveforce generated by the electromagnetic induction module. The real-time and on-line monitoring of the dowty retarder in the hump speed regulation system of the railway marshalling station can be realized. The dowty retarder with problem can be found in time. The occurrence of accidents can be reduced and the efficiency is improved.
Owner:SHANDONG UNIV
Motor capable of automatically adding and replacing lubricant
InactiveCN112696604AGuaranteed lubrication effectExtended service lifeLubricant transferGear lubrication/coolingGear wheelDrive shaft
The invention relates to the field of motors, and discloses a motor capable of automatically adding and replacing a lubricant. A main box body is included, the left end surface of the main box body is fixedly connected with an external connection block, and the tail end of the left side of the lower end surface of the external connection block is fixedly connected with a jet extension block. The lower end surface of the jet extension block is fixedly connected with a jet block extending downwards, a switch plate cavity is formed in the main box body, the number of rotating turns of a driving shaft is sensed through a magnetic induction block, after the driving shaft rotates by a certain number of turns, lubricant adding and replacing are automatically finished on an output source output gear and a motor bearing in the motor, the lubricity of the motor under high-load work can be guaranteed, friction force is reduced, the transmission ratio is improved, the service life of the motor is prolonged, noise of the motor in the working process is reduced, meanwhile, the lubricating timeliness is improved, the working state of the motor cannot be affected in the lubricating process, and the working efficiency of the motor is improved.
Owner:广州浩恙科技有限公司
A ring temperature sensor
ActiveCN109341880BAccurate temperature measurement accuracyEliminate crosstalkThermometers using electric/magnetic elementsSolid-state devicesEngineeringMechanical engineering
The invention discloses a ring-shaped temperature sensor for measuring the temperature of a transistor, which comprises: a ring-shaped P-type heavily doped region, a ring-shaped N-type heavily doped region sequentially arranged in the active region of the transistor from inside to outside. Region, ring anode, ring N well region and ring P well region; and ring cathode, the ring cathode is arranged in the ring N-type heavily doped region; wherein, the ring cathode is short-circuited with the source of the transistor .
Owner:INST OF MICROELECTRONICS CHINESE ACAD OF SCI
Odometer device for laying rails work-vehicle
The utility model relates to a trip meter device for a track-laying operation vehicle, which comprises a detection part and a fixed part; the detection part includes a trip wheel in contact with the surface of a steel rail and an encoder for feedback signals; The structure of the components is as follows: the guide sleeve is vertically installed under the installation beam fixed under the body of the work vehicle, the upper end of the guide column is sleeved in the guide sleeve, the lower end is equipped with a detection device, the lifting cylinder is installed in parallel with the guide column, and the upper end of the lifting cylinder is fixed. Outside the guide sleeve, the free end and the guide post are detachably connected, the two are fixedly connected in the hanging state, and the two are disengaged in the working state. The guide column is controlled by the lifting cylinder to move up and down, and can be retracted and released to change the working state. When the invention works, the trip wheel is depressed by its own weight on the rail surface, and the guide post and the guide sleeve form a kinematic pair, which can move flexibly vertically along the guide post, effectively eliminate the impact of the frame and the vehicle-mounted gantry crane on the trip accuracy, and ensure the accuracy of the trip. Accurate travel, prolong the service life of the travel meter.
Owner:株洲新通铁路装备有限公司
Patrol robot control terminal and control method thereof
PendingCN114750188ASolve the problem of one-to-one controlWork status impactManipulatorControl systemRemote control
The invention discloses a patrol robot control terminal and a control method thereof. The control terminal comprises a terminal panel, a right control handle, a left control handle and a control system. The right control handle and the left control handle are respectively connected to the right side and the left side of the terminal panel; the terminal panel, the right control handle and the left control handle are all in communication connection with the control system, and the control system is further in wireless communication connection with the background system and the robot. By means of the system, remote control over the robot can be achieved, work tasks of the multiple robots can be distributed or switched in real time, cluster deployment and control of the multiple robots are achieved, the patrol robot and actual combat application are more closely combined, and application and popularization of the patrol robot are accelerated.
Owner:THE FIRST RES INST OF MIN OF PUBLIC SECURITY +1
Automatic elimination circuit for input offset voltage of operational amplifier
ActiveCN111669130AWork status impactAmplifier modifications to reduce temperature/voltage variationControl signalSoftware engineering
The invention relates to an automatic elimination circuit for input offset voltage of an operational amplifier, which comprises a first control module, a second control module, a first current sourcemodule, a second current source module and an operational amplifier module, wherein the first control module generates a first control signal according to an output signal of the operational amplifiermodule; the second control module generates a second control signal according to the output signal of the operational amplifier module; the first current source module and the second current source module generate current signals according to the second control signal; the operational amplifier module achieves elimination of input offset voltage according to the current signal and achieves switching between an offset elimination mode and a working mode according to the first control signal. The automatic elimination circuit provided by the invention does not influence the working state of theoperational amplifier while eliminating the offset voltage.
Owner:XIDIAN UNIV
Method and device for fault diagnosis and treatment of hydrogen fuel cell
ActiveCN113571745BWork status impactHigh content of impurity gasesFinal product manufactureFuel cellsHydrogen concentrationControl engineering
Owner:广东省武理工氢能产业技术研究院
Gallium nitride power device with grid high voltage resistance and low electric leakage
PendingCN113782588AImprove practicalityImprove securitySemiconductor devicesOhmic contactEngineering
A gallium nitride power device with a high-voltage-resistance grid and low electric leakage comprises a P-type silicon substrate, an aluminum nitride buffer layer arranged on the P-type silicon substrate, an aluminum-gallium-nitrogen buffer layer arranged on the aluminum nitride buffer layer, a gallium nitride buffer layer arranged on the aluminum-gallium-nitrogen buffer layer, an aluminum-gallium-nitrogen barrier layer arranged on the gallium nitride buffer layer, a source electrode and a drain electrode, metal is arranged above the source electrode and the drain electrode to be used as the source electrode and the drain electrode to be connected with input and output from the two ends of the aluminum-gallium-nitrogen barrier layer to the periphery, ohmic contact is formed between the source electrode metal and the left end of the aluminum-gallium-nitrogen barrier layer, ohmic contact is formed between the drain electrode and the right end of the aluminum-gallium-nitrogen barrier layer, three P-type gallium nitride layers with different doping concentrations are stacked above the aluminum-gallium-nitrogen barrier layer, gate metal is arranged above the P-type gallium nitride layer to connect the P-type gallium nitride layer to input and output at the periphery of the structure, the gate metal and the P-type gallium nitride layer form Schottky contact, the P-type gallium nitride layer and the gate are relatively close to the source electrode and relatively far away from the drain electrode between the source electrode and the drain electrode, a nitride passivation layer is arranged between the drain electrode and the P-type gallium nitride above the aluminum gallium nitride barrier layer, and a nitride passivation layer is arranged between the source electrode and the P-type gallium nitride.
Owner:SOUTHEAST UNIV +1
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