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34results about How to "Small current change" patented technology
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OLED (Organic light-emitting diode) display panel, driving method thereof and display device
ActiveCN107622752AImprove pressure drop inconsistenciesSmall current changeStatic indicating devicesSolid-state devicesDisplay deviceVoltage drop
The invention discloses an OLED (Organic light-emitting diode) display panel, a driving method thereof and a display device. The pixel row number N2 in a second display area is set to be close to an integer multiple of a light and shade fringe period (A / nt-row pixels), that is, (k-0.1)A / n< / =N2t< / =(k+0.1) A / n, N2t>0, and k is an integer no smaller than 0. Although alternately light and shade stripes move constantly, the number of pixels with the maximum light pixels and the number of pixels with the minimum light pixels have little difference, the current changes are few, inconsistent PVDD voltage drop generated by large difference of the numbers of light pixels of the display panel in different times caused by the second display area can be improved, and the problem of uneven display is further solved.
Owner:SHANGHAI TIANMA MICRO ELECTRONICS CO LTD
Driving power supply of ballast type LED (Light-Emitting Diode) lamp
InactiveCN102523647AExtended service lifeImprove performanceElectric light circuit arrangementLED lampLight-emitting diode
The invention discloses a driving power supply of a ballast type LED (Light-Emitting Diode) lamp, comprising a capacitor (C) and a low-consumption inductive ballast (L). The driving power supply is characterized in that a rectifying element (D) is connected between the A end and an input N end of the low-consumption inductive ballast (L); and the LED lamp is connected between rectifying output ends (B and C). The driving power supply has the advantages of less self power consumption, low temperature rise, long service life, fewer elements, high working reliability and less harmonic content. The driving power supply is an ideal driving power supply of the LED lamp.
Owner:李顺华
Rail-to-rail differential input circuit
InactiveCN103973247AIncrease load carrying capacitySmall current changeAmplifier modifications to reduce temperature/voltage variationDifferential amplifiersTransconductanceCurrent source
The invention discloses a rail-to-rail differential input circuit which comprises a PMOS differential pair, an NMOS differential pair, a PMOS switch tube, an NMOS switch tube, a PMOS current source, an NMOS current source, a PMOS current mirror and an NMOS current mirror. The currents output by the PMOS current source and the NMOS current source are equal, and the PMOS current source comprises a first PMOS transistor and a second PMOS transistor, wherein the first PMOS transistor and the second PMOS transistor form a cascade structure. The NMOS current source comprises a first NMOS transistor and a second NMOS transistor, wherein the first NMOS transistor and the second NMOS transistor form a cascade structure. According to the rail-to-rail differential input circuit, the tail current precision can be improved, and the better constant transconductance effect can be achieved.
Owner:SHANGHAI HUALI MICROELECTRONICS CORP
Variable transconductance circuit
InactiveCN1893262ASmall current changeReduce power consumptionDifferential amplifiersDisposition/mounting of headsLow voltageEngineering
The invention provides a variable transconductance circuit. The variable transconductance device includes a voltage-current conversion circuit that outputs a current signal that is linear relative to the input voltage signal (Vi); the first MOS transistor and the second MOS transistor (M1, M2) input the above-mentioned current signal and convert it into The voltage signal subjected to square root compression; and the 3rd MOS transistor and the 4th MOS transistor (M3, M4), which convert the voltage signal subjected to square root compression into a linear current signal, by making the 1st MOS transistor and the 2nd MOS transistor (M1, M4) respectively The bias current (Ia) of M2) and the bias current (Ib) of the third MOS transistor and the fourth MOS transistor (M3, M4) are changed to control gm, which can be realized with a low power supply voltage of about 3V in one circuit The variable gm is about 20 times, and can solve the problem of power consumption and increase of the installation circuit area.
Owner:PANASONIC CORP
Rail-to-rail operational amplifier
InactiveCN101841309AStable bias stateGuaranteed to workDifferential amplifiersDc-amplifiers with dc-coupled stagesAudio power amplifierEngineering
The invention discloses a rail-rail operational amplifier, which comprises a Miller compensation circuit respectively connected with a first-stage circuit and a second-stage circuit, wherein the first-stage circuit comprises an N-pipe input circuit, a P-pipe input circuit, a current injection circuit, a current extraction circuit, a first-stage output branch circuit and a biasing circuit, and thecurrent extraction circuit compensates the current injected into the first-stage output branch circuit by the P-pipe input circuit, so that the current in the first-stage output branch circuit is notaffected by the current in the P-pipe input circuit; similarly, the current injection circuit compensates the circuit injected into the first-stage output branch circuit by the N-pipe input circuit, so that the current in the first-stage output branch circuit is not affected by the current in the N-pipe input circuit; and the second-stage circuit is of a common-source amplifier taking a current source as a load. The operational amplifier not only has simple structure, but also ensures higher gain in a range of rail-to-rail voltage, stabilizes the DC level of the first-stage output end, and improves the bandwidth of the operational amplifier.
Owner:XI AN JIAOTONG UNIV
Control method of photovoltaic LCL type grid-connected inverter
ActiveCN105955033AGuaranteed certaintyNo distortionAdaptive controlSystems designGrid connected inverter
The invention relates to a control method of a photovoltaic LCL type grid-connected inverter. The control method is characterized by comprising the steps of: considering that a photovoltaic LCL type grid-connected inverter system has input uncertainty faults and actuator faults, establishing a fault mathematical model, and setting a fixed control distributive law; establishing a system state high-order sliding-mode observer and state estimation errors thereof according to the fault mathematical model, and adopting the high-order sliding-mode observer for realizing accurate estimation of system fault information; and constructing a continuous integral sliding-mode fault-tolerant controller mathematical model according to the fault mathematical model, the fixed control distributive law, the high-order sliding-mode observer and the state estimation errors thereof, wherein the continuous integral sliding-mode fault-tolerant controller mathematical model is used for processing the actuator faults directly. The control method is reasonable in design, can realize stable control under parameter uncertainty faults and actuator faults, and exhibits good tracking performance and fault tolerance. The control method provides a new idea for the design of a large-scale photovoltaic LCL type grid-connected inverter control system, and has a good engineering application prospect.
Owner:TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
Transmitting end driving circuit and method
ActiveCN109729295ASmall current changeEasy to meet the requirements of output voltage amplitude changeTelevision system detailsColor television detailsVoltage amplitudeControl signal
The invention provides a transmitting end driving circuit and method. The transmitting end driving circuit comprises a calibration control unit, wherein the calibration control unit generates a calibration control signal changing along with process, power voltage or temperature; A current calibration unit that generates a calibration current based on the calibration control signal; A bias voltagegeneration unit that generates a bias voltage on the basis of the calibration current; The output stage driving unit which is used for amplifying the to-be-output signal based on the bias voltage andoutputting the amplified to-be-output signal; And an impedance matching unit that adjusts the output impedance based on the calibration control signal. the method includes: Generating a calibration control signal; Generating a calibration current based on the calibration control signal to obtain a bias voltage; Under the action of the bias voltage, amplifying a signal to be output, and obtaining astable output signal through impedance matching. According to the invention, current and resistance change caused by process, power supply voltage and temperature change is effectively reduced, the requirement of an HDMI 2.0 protocol on the amplitude change of the output voltage of the transmitting end is met, a better impedance matching effect is achieved, and the signal transmission quality iseffectively improved.
Owner:VERISILICON MICROELECTRONICS SHANGHAI +1
Driving power device of ballast type LED lamp
PendingCN103582232AConstant currentSmall current changeElectric light circuit arrangementVoltage rangeCapacitance
The invention discloses a driving power device of a ballast type LED lamp. The driving power device comprises a capacitor (C) and a low-consumption inductive ballast (L). The driving power device of the ballast type LED lamp is characterized in that the two ends (the L end and a node 1) of the capacitor (C) are at least connected with a series circuit which is composed of a routing capacitor (Ca) and a switch (Ka), the power input ends (the L end and the N end) of the driving power device of the ballast type LED lamp are further in parallel connection with a circuit device (DJ) which drives the state of the switch (Ka) to be converted when input voltages change. The driving power device of the ballast type LED lamp has the advantages that the purpose that a driving power source of the ballast type LED lamp is within a wide input voltage range (like 160V-250V) is achieved, the currents of the LED lamp are kept basically constant, and the driving power source of the ballast type LED lamp is made to be an ideal driving power source of the LED lamp.
Owner:李顺华
Multichannel value of resistance automation measuring system
InactiveCN103134988AWon't hurtIncrease speedResistance/reactance/impedenceCurrent limitingElectronic switch
The invention discloses a multichannel value of resistance automation measuring system. The multichannel value of resistance automation measuring system comprises a burn-in power source, a multichannel electronic switch array, a data collector, a current-limiting resistance, a circuit protection unit and a computer, wherein the multichannel electronic switch array is a multichannel single-pole double-bladed switch array, according to a test requirement of arbitrary one-channel component in multichannel infrared devices, the channel component is disconnected with the burn-in power source and is connected with the data collector to finish automatic switch between a try state and a test state of the component; simultaneously, the data collector is used for measuring value of resistance of the switched component to achieve the aim that the value of the resistance is automatically measured. By the adoption of a method that the computer sends command to a RS232 interface means of the data collector, the measured data are transferred to the computer to be stored; by the adoption of the system, the facts that the value of the resistance of the multichannel component is automatically measured and the data of the multichannel component is automatically stored are achieved, the rate, the accuracy and the data size of collecting component burn-in data are improved.
Owner:SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
Metal detector for belt conveyer
ActiveCN101988971AOscillating current decreasesOscillating current increasesElectric/magnetic detectionAcoustic wave reradiationElectricityAudio power amplifier
A metal detector for a belt conveyer applied to the fields of coal, metallurgy, electricity, mine and the like comprises sensors, an oscillator, a high amplification circuit, a detection circuit, a low amplification circuit and an actuator. Two sensors L1 and L2 are arranged. The sensor L1 is sleeved on a belt, and the sensor L2 is placed below a conveying belt. A signal of the sensor L1 passes through an amplification channel and then enters a positive and negative phase detection circuit consisting of diodes D21 and D22. The detected signal is divided into two paths and then respectively enters amplifiers IC8 and IC9. The amplifier IC8 outputs the signal to an amplifier IC10 to drive the actuator. The amplifier IC9 outputs the signal to control the grid of a field effect tube V9. The field effect tube V9 and a resistor R30 which divide the voltage output the voltage to control the input voltage of the amplifier IC10. A signal of the sensor L2 passes through an amplification channel and then is outputted through an amplifier IC11 to drive a field effect tube V10. The field effect tube V10 and the resistor R30, which divide the voltage, control the input voltage of the amplifier IC10. The metal detector avoids the interference caused by reinforcing a wire connector in the conveying belt and the interference due to variation of magnetic inductivity in the process of conveying ore materials.
Owner:LONGI MAGNET CO LTD
Novel energy storage system experiment platform and working method
InactiveCN109301850AImprove stabilityImprove cycle lifeAc network load balancingCapacitanceThermal energy storage
The invention discloses a novel energy storage system experiment platform and a working method, and the experiment platform comprises an array simulation module, an energy storage element and a management module thereof, a charging and discharging control module, a main power module, an intelligent control module, a DC load module, a serial port management module, an LAN management module and an upper computer. The array simulation module is used for providing an energy source for the energy storage element. The energy storage element and the management module include a lead-acid battery packand its management module, a lithium battery pack and its management module, a supercapacitor module and its management module. The charging and discharging control module includes a lead-acid batterypack charging and discharging control module, a lithium battery pack charging and discharging control module, and a super capacitor module charging and discharging control module. The main power module is used for providing working power for the experiment platform. The intelligent control module is used for controlling the charging and discharging strategy of the energy storage element. The DC load module is used for stimulating electrical equipment. The upper computer receives and displays the operating data and the operating state of the energy storage element through the serial port management module and the LAN management module.
Owner:NANJING KANGNI ELECTRIC TECH CO LTD
Island multi-inverter parallel sensor fault diagnosis method
PendingCN111953009AGuaranteed stabilityFast startupSingle network parallel feeding arrangementsFault location by conductor typesMicrogridControl engineering
According to the method, a microgrid island multi-inverter parallel system under the influence of sensor faults is researched, and a nonlinear multi-inverter parallel system TS fuzzy model is established. A fuzzy proportional-integral observer is designed to effectively estimate the fault; meanwhile, a fuzzy special observer is adopted, and faults are detected and isolated through a residual reconstruction mechanism. And then, through established fuzzy Taylor series expansion and Lyapunov, sufficient conditions for verifying the stability of the system are proved, and the stability is proved.And finally, simulation is carried out in a Simulink environment, and the effectiveness of the fault diagnosis method is verified. The fault diagnosis method based on the island multi-inverter parallel sensor is reasonable in design, stable control under parameter uncertainty faults and actuator faults can be well achieved, good tracking performance and fault tolerance are shown, a new thought isprovided for design of a fault diagnosis system of the multi-inverter parallel sensor in an island mode, and the fault diagnosis method is suitable for large-scale popularization and application. Goodengineering application prospects are realized.
Owner:TIANJIN UNIV OF SCI & TECH
A half-bridge circuit with ultra-wide range constant current that realizes regulation from 0v
InactiveCN102281684ASimple structureWide constant current rangeEfficient power electronics conversionDc-dc conversionTransformerEngineering
The invention discloses a half-bridge circuit with an ultra-wide range of constant current that can be adjusted from 0V. The half-bridge circuit includes a PFC control circuit, a PFC boost circuit, a half-bridge control circuit, a half-bridge main circuit and a transformer circuit, and an external power supply is input to the PFC. The boost circuit is boosted by the PFC boost circuit and output to the main circuit of the half-bridge, and then output to the transformer circuit after constant current processing by the main circuit of the half-bridge, and then output to supply power to the load after being transformed by the transformer circuit, the PFC control circuit controls the PFC The boost circuit works, and the half-bridge control circuit controls the work of the half-bridge main circuit. The circuit structure of the present invention is simple, without adding additional circuits, it can realize wide constant current range and small current change, and can make the output terminals be connected in any number from one LED lamp to multiple lamps.
Owner:MOSO POWER SUPPLY TECH
Low-dropout shunt voltage stabilizer
ActiveCN110531826ALess energy consumptionAdjust the layout flexiblyElectric variable regulationLow voltageVoltage reference
The invention provides a low-dropout shunt voltage stabilizer. The low-dropout shunt voltage stabilizer comprises a first current mirror module, a second current mirror module and an output module. The first end of the first current mirror module is electrically connected with an input voltage; the first current mirror module has high output impedance; the first end of the second current mirror module is electrically connected with the second end of the first current mirror module; the second end of the second current mirror module is electrically connected with a reference voltage; the outputend of the output module is electrically connected with the third end of the first current mirror module; the output end and the first end of the output module are electrically connected with the second current mirror module; and the second end of the output module is electrically connected with the reference voltage. According to the low-dropout shunt voltage stabilizer, a current mirror circuitwith high output impedance is formed by combining a low-voltage switch assembly and a high-voltage switch assembly, so that the current change caused by the large-amplitude input voltage range can bereduced, and the internal energy consumption of the low-dropout shunt voltage stabilizer can be reduced.
Owner:LITE ON SINGAPORE PTE LTD
Forward-flyback switching power supply circuit and control method thereof
ActiveCN111884514AIncrease the demagnetization timeSmall current changeEfficient power electronics conversionDc-dc conversionReverse converterLow voltage
The invention provides a forward-flyback power supply circuit, and the circuit integrates the advantages of a forward converter and a flyback converter and utilizes the characteristic that an output inductor changes along with the change of an input voltage to reduce the change rate of the current of a forward loop at a high-low voltage current. In addition, by adjusting the number of turns of theforward winding and the inductance value of the output inductor, it can be guaranteed that the current of the forward loop is basically kept unchanged at high voltage and low voltage, and therefore the size of the forward-reverse converter is reduced, and output ripples are reduced through reasonable energy distribution of the forward loop and the flyback loop; the ZVS of the main switching tubeis realized by utilizing the active clamping circuit, so the efficiency of the flyback converter is improved, and the EMI is improved.
Owner:MORNSUN GUANGZHOU SCI & TECH
Shield door obstacle secondary detection device and method for rail traffic
ActiveCN109612508AEliminate the safety hazard of being trappedReduce light intensityConverting sensor output opticallyLight beamEngineering
The invention relates to the technical field of rail traffic equipment, and discloses a shield door obstacle secondary detection device for rail traffic. The shield door obstacle secondary detection device comprises a left door plate and a right door plate; adhesive strips are arranged on the opposite side faces of the left door plate and the right door plate correspondingly; the bottom end of oneside of the left door plate is fixedly connected with a base, and the side, opposite to the left door plate, of the right door plate is provided with a reserved groove; and the width of the reservedgroove is matched with the width of the base. By arranging a light beam generator and a photoresistor, thus when the left door plate and the right door plate operate to a to-be-closed state, obstacledetection is completed through the light beam generator and the photoresistor, traditional small obstacle pressure detection is converted into small obstacle shading detection, thus finding of the equilibrium point between the expected motor current accuracy of a door speed curve and the correction function of a DCU for the voltage in a door speed change detection method is omitted, meanwhile, anobstacle detection effect on soft objects is achieved, and the potential safety hazard that in the operating process of an existing shield door, the soft objects such as clothing are clamped is eliminated.
Owner:南通辰同智能科技有限公司
Flat-topped pulsed magnetic field generation device and method, medium, equipment and terminal
PendingCN114553021AIncrease the strength of the magnetic fieldMutual inductance is ignoredAc-dc conversion without reversalConversion without intermediate conversion to dcDual coilEngineering
The invention belongs to the technical field of high-intensity magnetic field pulse power, and discloses a flat-topped pulsed magnetic field generation device, method, medium, equipment and terminal.The flat-topped pulsed magnetic field generation device comprises a plurality of capacitor type power sources formed by connecting in parallel, and each capacitor type power source is composed of a capacitor set, a protection inductor of the capacitor set, a discharge thyristor and a follow current loop; a pulse rectifier type power supply is composed of a power supply and a rectifier matched with the power supply. A dual-coil magnet; a rectifier output end positive pole of the pulse rectifier type power supply is connected with a positive pole of the magnet inner coil, and a rectifier output end negative pole is connected with a negative pole of the magnet inner coil; and the output end anodes of the capacitor type power supplies are connected with the anode of the magnet outer coil, and the output end cathodes are connected with the cathode of the magnet outer coil. The flat-topped pulsed magnetic field generating device based on the double-coil magnet can generate a flat-topped pulsed magnetic field with high stability, high field intensity and long flat-topped pulse width, and provides a necessary strong magnetic field environment for scientific experiments such as nuclear magnetic resonance and specific heat measurement.
Owner:HUAZHONG UNIV OF SCI & TECH
Method for removing and preventing wax of mechanical recovery well by microorganism
ActiveCN102287167BReduce viscosityReduce pollutionCleaning apparatusDrilling compositionStable stateEconomic benefits
The invention discloses a method for removing and preventing wax of a mechanical recovery well by a microorganism wax removal and prevention composite bactericide. In the method, the microorganism composite bactericide is injected into a well bottom, and the concentration of the composite bactericide in well bottom liquid is not lower than 100mg / L, and is up to 50,000 mg / L; and an agent adding cycle is 10 to 28 days to ensure that the wax content of crude oil is reduced until the standard is met. Through a wax removal and prevention experiment of eight wells on which wax can be precipitated easily, compared with a method for removing and preventing wax by using a chemical wax removal and prevention agent, the method has the advantages that: the using amount of the microorganism wax removal and prevention agent is recued by more than 40 percent, the cost is saved by 20 to 50 percent, the agent adding cycle is more than two times the conventional agent adding cycle, and the economic benefit is obvious; moreover, during experiment, current of the mechanical recovery well changes slightly, and the current is in a stable state basically, and the effect is better or equal to that of the chemical wax removal and prevention agent. Therefore, the method has the advantages of low environmental pollution, low cost, long action period, high economic benefit and wide application range, plays an important role in the wax removal and prevention of the field of oil exploitation, and has wide application prospect.
Owner:PETROCHINA CO LTD +1
Transmitter drive circuit and method
ActiveCN109729295BSmall current changeEasy to meet the requirements of output voltage amplitude changeTelevision system detailsColor television detailsVoltage amplitudeControl signal
Owner:VERISILICON MICROELECTRONICS SHANGHAI +1
Detection machine for identifying mask types by utilizing capacitance change
The invention relates to the technical field of mask detection, and provides a detection machine for identifying mask types by utilizing capacitance change, which comprises a machine body, a pipelineis fixedly connected to the inner wall of the bottom of the machine body, a glass cover is fixedly connected to the top of the pipeline, a rotating shaft is movably connected to the inner wall of theglass cover, and a torque spring is elastically connected to the outer wall of the rotating shaft; and the outer wall of the rotating shaft is fixedly connected with a valve, and the left and right inner walls of the glass cover are fixedly connected with capacitor plates. According to the detection machine for identifying mask types by utilizing capacitance change, the mask is placed at the top of the glass cover through the machine, an outlet in the top of the glass cover is blocked by the mask, the filterability of the mask is different, the variable quantity of particles in unit time is different, the particles enter between the two capacitance plates through the mask, the current is increased, and the current enters the direct-current voltage stabilizer through a wire; the direct-current voltage stabilizer stabilizes the voltage so as to supply the voltage to the driving mechanism, the rotating speed of the driving mechanism is changed accordingly, and the mask type is judged through capacitance change.
Owner:陈奇
A control method for a photovoltaic lcl type grid-connected inverter
ActiveCN105955033BGuaranteed certaintyNo distortionAdaptive controlSystems designGrid connected inverter
The invention relates to a control method of a photovoltaic LCL type grid-connected inverter. The control method is characterized by comprising the steps of: considering that a photovoltaic LCL type grid-connected inverter system has input uncertainty faults and actuator faults, establishing a fault mathematical model, and setting a fixed control distributive law; establishing a system state high-order sliding-mode observer and state estimation errors thereof according to the fault mathematical model, and adopting the high-order sliding-mode observer for realizing accurate estimation of system fault information; and constructing a continuous integral sliding-mode fault-tolerant controller mathematical model according to the fault mathematical model, the fixed control distributive law, the high-order sliding-mode observer and the state estimation errors thereof, wherein the continuous integral sliding-mode fault-tolerant controller mathematical model is used for processing the actuator faults directly. The control method is reasonable in design, can realize stable control under parameter uncertainty faults and actuator faults, and exhibits good tracking performance and fault tolerance. The control method provides a new idea for the design of a large-scale photovoltaic LCL type grid-connected inverter control system, and has a good engineering application prospect.
Owner:TIANJIN UNIV OF SCI & TECH
Self-adapting wire coil to power of induction cooker
ActiveCN101093085AOptimize Electromagnetic CouplingAvoid burnsDomestic stoves or rangesLighting and heating apparatusPower factorInduction motor
This invention relates to a power adaptive wire coil of induction cookers including a bracket, magnetic strips distributed in radiation and a coil fixed on the bracket characterizing that part or whole of the coil passes through at least one ring magnetizer and the near-core end of at least one magnetic strip includes an upward corner higher than the top surface of the ring magnetizer to avoid burning down the upper part of the magnetizer with extra numbers of magnetic lines passing through at sudden unload.
Owner:HONGYANG HOME APPLIANCES
Direct current microgrid fault current controller and control method thereof
PendingCN113949048ASmall current changeReduce sizeEmergency protective arrangements for automatic disconnectionCapacitanceMicrogrid
The invention discloses a direct-current micro-grid fault current controller and a control method thereof. The controller comprises a first switch tube, a second switch tube, an energy storage element and a capacitor; a collector of the first switch tube is connected to a positive electrode of the energy storage element, an emitter of the first switch tube is connected to a collector of the second switch tube, and an emitter of the second switch tube is connected to a negative electrode of the energy storage element; and the first end of the capacitor is connected between the first switch tube and the second switch tube, and the second end is connected to the emitter of the second switch tube. During normal operation, the interelectrode voltage is rated voltage, the current change is small, the control duty ratio is the first duty ratio, and constant voltage control is performed at the moment. When the interelectrode voltage is smaller than a preset threshold value, it is judged that a fault occurs, the duty ratio is switched into a second duty ratio, and constant current control is changed. After the fault is cleared, the interelectrode voltage rises, the duty ratio is switched into the first duty ratio, and the constant voltage control mode is recovered. The technical problems of poor current limiting effect and poor controllability in the prior art are solved.
Owner:GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
Constant current source generation circuit
The invention relates to a constant current source generation circuit, in particular to a constant current source generation circuit which is suitable for controlling current magnitude with direct current voltage, belonging to the technical field of an electronic circuit. The constant current source generation circuit comprises a sample amplifier U1, a summator U2, a triode N1, resistors R1, R2, R3, R4 and R5, a load and a power supply that are in circuit connection, wherein the sample amplifier U1 has sampling action for the power supply and is used for sampling the potential of the load, the summator U2 is an addition operation amplifier, the positive potential of the summator U2 is an intermediate value of the sample potential and the precise normal potential, and through two times of feedback amplification, the positive potential of the summator U2 is the sum of the sample potential and the precise normal potential; the output of the summator U2 is connected with a common base of the triode N1 to control the voltage output of the common base, the change the summator U2 is changed along with the change of the load sample, and then the voltage output is regulated by the triode N1 to reach potential balance. The constant current source generation circuit has the characteristics that the precision and the load power are improved, the circuit structure is simple, the cost is low, the control is easy, etc.
Owner:SHANGHAI YIDIAN SCI INSTR
Overhead line fault positioning monitoring device
ActiveCN106199334APrevent intrusionImprove power extraction capacityFault location by conductor typesElectricityGrid fault
Provided is an overhead line fault positioning monitoring device, belonging to the field of power grid fault detection apparatus. The device includes a base and a fault detection module arranged on the base, the base is provided with an inclined plane, a semi-cylindrical flip cover is arranged corresponding to the inclined plane, the base is connected with the flip cover through a locking slide lock, the fault detection module includes two through type current transformers, one is an electricity obtaining ring and the other is a measuring ring, the winding of the electricity obtaining ring is connected to the input port of the power supply of the fault detection module, the winding of the measuring ring is connected to the monitoring signal input port of the fault detection module, each current transformer is divided into an upper half ring and a lower half ring that are fixed on the base, and the upper half ring is correspondingly arranged on the flip cover. The connection of the base and the flip cover is realized by the locking slide block structure, so that the installation is convenient; the double current transformers effectively solve the contradiction between the induction electricity obtaining and measurement, so that the measurement precision is improved while the normal work of the device is guaranteed, and the device has the characteristic of high fault capturing accuracy.
Owner:鄄城县地方特产发展服务中心
Low Dropout Shunt Regulator
ActiveCN110531826BLess energy consumptionAdjust the layout flexiblyElectric variable regulationHemt circuitsVoltage reference
The invention provides a low-dropout shunt voltage stabilizer. The low-dropout shunt voltage stabilizer comprises a first current mirror module, a second current mirror module and an output module. The first end of the first current mirror module is electrically connected with an input voltage; the first current mirror module has high output impedance; the first end of the second current mirror module is electrically connected with the second end of the first current mirror module; the second end of the second current mirror module is electrically connected with a reference voltage; the outputend of the output module is electrically connected with the third end of the first current mirror module; the output end and the first end of the output module are electrically connected with the second current mirror module; and the second end of the output module is electrically connected with the reference voltage. According to the low-dropout shunt voltage stabilizer, a current mirror circuitwith high output impedance is formed by combining a low-voltage switch assembly and a high-voltage switch assembly, so that the current change caused by the large-amplitude input voltage range can bereduced, and the internal energy consumption of the low-dropout shunt voltage stabilizer can be reduced.
Owner:LITE ON SINGAPORE PTE LTD
State-of-charge estimation method for battery pack of electric vehicle
The embodiment of the invention discloses a state-of-charge estimation method for a battery pack of an electric vehicle, and the method comprises the steps: carrying out the initial correction of the state-of-charge of the battery pack according to the sleep duration of the electric vehicle in a sleep state, and obtaining an initial state-of-charge; switching a corresponding state-of-charge estimation method according to the cell temperature and the current state-of-charge; if the temperature and the state of charge of the battery cell are smaller than the threshold values, calculating the current state of charge of the battery cell in a set time period through an ampere-hour integration method, and if the temperature and the state of charge of the battery cell are larger than the threshold values, estimating the state of charge of the battery cell through a closed-loop algorithm of a battery cell model; and estimating the current state of charge of the battery pack according to the estimated state of charge of each battery cell. According to the method for estimating the state of charge of the battery pack of the electric vehicle, the estimated SOC precision can be effectively improved in the whole working condition and the whole life cycle.
Owner:DONGFENG MOTOR CORP HUBEI
Variable transconductance circuit
InactiveCN100574094CSmall current changeReduce power consumptionDifferential amplifiersDisposition/mounting of headsTransconductanceElectrical current
Owner:PANASONIC CORP
Self-adapting wire coil to power of induction cooker
ActiveCN100485268CHigh electromotive forceReduce air gapDomestic stoves or rangesLighting and heating apparatusPower factorInduction motor
This invention relates to a power adaptive wire coil of induction cookers including a bracket, magnetic strips distributed in radiation and a coil fixed on the bracket characterizing that part or whole of the coil passes through at least one ring magnetizer and the near-core end of at least one magnetic strip includes an upward corner higher than the top surface of the ring magnetizer to avoid burning down the upper part of the magnetizer with extra numbers of magnetic lines passing through at sudden unload.
Owner:HONGYANG HOME APPLIANCES
Metal detector for belt conveyer
ActiveCN101988971BOscillating current decreasesOscillating current increasesElectric/magnetic detectionAcoustic wave reradiationElectrical resistance and conductanceElectricity
Owner:LONGI MAGNET CO LTD
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