60results about How to "Change the size of the current" patented technology

The invention discloses a novel ignition temperature measuring device for experiment, aiming at providing an ignition device which ignites fuel only by using heat generated by an ignition wire. The device disclosed by the invention comprises an ignition wire, an ignition power source and an ignition platform. A first ignition hole, a second ignition hole, a first temperature measuring hole and a second temperature measuring hole are arranged on the ignition platform. An ignition temperature measuring cylinder is arranged on a bracket above the center of the ignition platform and is provided with a small hole and a thermocouple, and the thermocouple is connected with a thermometer through the first temperature measuring hole and the second temperature measuring hole on the ignition platform via a lead wire. The ignition wire is arranged above the ignition temperature measuring cylinder, two ends of the ignition wire are fixed at a first ignition column and a second ignition column which are externally sleeved with a bracket, a pressure spring and a fastening rotary sheet respectively. The first ignition column and the second ignition column are fixed on the ignition platform and are connected with the ignition power source respectively through the first ignition hole and the second ignition hole on the ignition platform, and the ignition power source is formed in such a manner that a plug, a power-off protector and a contact type voltage regulator are connected via the lead wire. The device disclosed by the invention is mainly used for fuel ignition and temperature measurement during fuel combustion in a laboratory.

The invention provides an AMOLED display device based ELVDD power supply method and device and display device, and relates to field of display technology. An ELVDD can provide each frame of picture for the AMOLED display device flexibly. The method comprises that data signals of each row of pixels in a frame of picture are obtained; the data signals of each row of pixels are compared with gray scale values of at least two levels; a gray scale value corresponding to the data signals of the row of pixels is determined, and a target level of the closest gray scale value is used as the gray scale level corresponding to the data signals of the row of pixels, and the gray scale value corresponding to the data signals of the row of pixels is greater than the gray scale value of the target level; and the highest gray scale level corresponding to the data signals of the row of pixels serves as the gray scale level of the frame of picture, and the ELVDD corresponding to the highest gray scale level is used to drive the frame of picture. The method and device are used for manufacture of the AMOLED display device.

The invention relates to the technical field of environmental monitoring, and discloses a self-cleaning type camera for environmental monitoring. The self-cleaning type camera for environmental monitoring comprises a camera shooting main body, wherein the upper end of the camera shooting main body is fixedly connected to a fence; the left side of the fence is fixedly connected to a partition plate; expanding sponge is arranged on the middle part of the inner cavity of the partition plate; the side wall of the inner cavity of the partition plate is provided with a tough block; the right side ofthe expanding sponge is provided with a guide rod which extends into the inner cavity of the touch block; the rear end of the fence is fixedly connected to a regulating box; the inner cavity of the regulating box is provided with a fan; a monitoring disc fixedly sleeves the fan; and the inner cavity of the monitoring disc is provided with a metal ball. According to the self-cleaning type camera for environmental monitoring disclosed by the invention, the expanding sponge absorbs water to drive the guide rod to be in contact with a metal sheet, so that a brush roller is started to work, and the brush roller is matched with a rainwater impact fan for enabling the metal ball to be in contact with different parts of a variable resistor, and therefore, the effects of guaranteeing the camera tobe clear all the time and reasonably controlling output are achieved.

The invention discloses a vanadium dioxide and two-dimensional semiconductor junction type photodetector and a preparation method thereof. According to the photodetector, the method comprises the steps of: growing a layer of uniform vanadium dioxide film on an aluminum oxide substrate through magnetron sputtering; etching the vanadium dioxide film into an array by using a photoetching mask and anargon plasma etching technology; and transferring the two-dimensional semiconductor to a vanadium dioxide material through dry transfer to form a heterojunction with a vertical structure, and preparing a metal electrode on the vanadium dioxide and the two-dimensional semiconductor by using an electron beam lithography method in combination with a stripping process to form the heterojunction type optical detection device with the vertical structure. The device structurally comprises the substrate, vanadium dioxide, the two-dimensional semiconductor and metal source and drain electrodes from bottom to top. By regulating and controlling bias voltage, the device can realize P-N junction and Bolometer conversion, thereby realizing detection from visible light to far infrared band spectrum, being low in power consumption and high in sensitivity, and being capable of working in a high-temperature environment.

The invention discloses a novel damping and cushioning integrating device. The novel damping and cushioning integrating device comprises a cylinder with the variable cross-section, a first piston arranged in the cylinder, a first piston rod connected to the first piston, a second piston rod connected to the first piston, a second piston arranged at the end of the second piston rod, and an upper end cover and a lower end cover arranged at the end of the cylinder, the cylinder comprises a damping section and a buffering section, and a gap is kept between the first piston and the inner wall of the cylinder; and the second piston is arranged in the buffering section, the second piston can move in the axial direction of the cylinder, and the buffering section is filled with ferromagnetic particle small balls. According to the technical scheme of the novel damping and cushioning integrating device, the performance of a magnetorheological damper is used, a variety of external working conditions can be adapted, and the high damping performance is achieved; and during buffering, the particle damper performance is used, the output force value is stable, a magnetic field is changed by adjusting the coil current, the friction coefficient of the second piston and particles is adjusted, a variety of buffering conditions can be adapted, and the novel damping and cushioning integrating deviceis compact in structure and simple in mounting form.

The invention discloses an ink-jet-printing-technology-based preparation method of flexible wireless pressure detection system. The preparation method is characterized in that metal graphical processing of a flexible substrate surface is realized by ion exchange based on an all-wet chemical process; a flexible pressure sensor and a flexible antenna are prepared successively to realize signal transmitting and receiving; and then integration is carried out to form a flexible wireless pressure-sensitive sensor. Mechanical signals can be collected, transmitted and processed. During the metal graphical process, a common ink-jet printer can be used for printing with the low cost; and the obtained silver circuit is continuous and compact and the conductivity is high. The bonding force between a pressure sensing unit, the silver circuit, and the flexible substrate is strengthened; the pressure response frequency reaches 10000 hertz; and the pressure response range is from 10 pascal and 1 megapascal. During the flexible antenna signal collection and transmission, pressure response and transmission can be completed within 0.02 seconds. The flexible equipment has high stability; and the bending fatigue test demonstrates that the stability of the circuit characteristic of the system is kept after repeated 10000-times testing.

The invention belongs to the technical field of constant current driving, and provides a switch power driving circuit and a silicon controlled rectifier dimmer LED drive circuit. A switch power driving chip is connected with an input-level rectification filter circuit and an output-level circuit, The input-level rectification filter circuit is connected with a silicon controlled rectifier dimmer. The switch power driving chip comprises a dimmer control module, a voltage sampling module, a constant current control module, an error amplifier, conduction time control module, a demagnetization control module, a trigger and a switch member. The silicon controlled rectifier dimmer conducts tangential processing on a wire mesh, and the brightness of a lighting lamp is changed accordingly according to the tangential angle. The input referential voltage of an in-phase input end of the error amplifier is changed to change the current passing through the LED lamp and to further change the brightness of the LED lamp and achieving silicon controlled rectifier dimming purpose. The maximal output current does not fluctuate with the wire mesh and output voltage. The dimming scope is wide, and the cost performance is high.

The invention discloses a self-compensation band-gap reference source structure based on a curvature function and application of the self-compensation band-gap reference source structure. The self-compensation band-gap reference source structure comprises a plurality of bipolar transistors, wherein one ends of the bipolar transistors are in common ground connection, the other ends of the bipolar transistors are respectively connected with one end of a resistor R1 through corresponding resistors, the other end of the resistor R1 is connected with an operational amplifier through a field effect transistor, and the temperature coefficient of a reference voltage VREF of the band-gap reference source is reduced by utilizing the nonlinearity of the current gain beta of the bipolar transistor. By using the nonlinearity of the current gain beta of the BJT, the temperature coefficient of the reference voltage is greatly reduced. Meanwhile, the band-gap reference source adopts a self-compensation structure, an additional temperature compensation circuit is not needed, temperature compensation is directly achieved in a core circuit of the band-gap reference source, the structure is simple, and influences caused by process errors are reduced.

The invention provides a vehicle seat. The vehicle seat comprises a seat body, a seat base, a front-back adjusting guide rail, a height adjuster, a plurality of magnetic levitation devices, a first sensor installed on a vehicle, a second sensor installed on the vehicle seat above the magnetic levitation devices, and an electronic controller electrically connected with the first sensor, the secondsensor and the magnetic levitation devices, wherein the electronic controller is configured to provide a control signal according to a first detection signal from the first sensor and a second detection signal from the second sensor to control the plurality of magnetic levitation devices so as to provide active shock absorption. The invention further provides a method for providing active shock absorption for the vehicle seat. By means of the vehicle seat, active shock absorption can be provided for the seat, the vibration of the seat along with the vehicle is weakened, and thus the comfort isimproved.

Provided is an automatic dimming LED constant-current driving circuit. Working voltage is provided for a dimming module by a voltage dividing module to enable the diming module to output a pulse modulation and demodulation signal to a constant-current driving module so as to change the magnitude of current output by the constant-current driving module. Further, the input current of a series LED lamp group connected with the output end of the constant-current driving module can be controlled, and the lighting brightness of the series LED lamp group can be changed. Meanwhile, a light sensing module is used for sensing the brightness of the series LED lamp group, and making the dimming module change the duty ratio of the pulse modulation and demodulation signal when the brightness of the series LED lamp group is lower or higher than the nominal light intensity, so as to change the output current of the constant-current driving module and make the brightness of the series LED lamp group at the nominal light intensity.

The invention discloses an automatic alarm device with a fire smoke detection function, which comprises a fixing device, a gas collection device, a detection device and a guide device, wherein the fixing device comprises a base and a shell, one side of the shell is fixedly connected with one side of the base, the base is provided with a plurality of fixing holes, the gas collection device is connected with the shell, the detection device is connected with the shell, the guiding device is movably connected with the shell, the shell is sequentially provided with an air inlet channel and a mounting groove from bottom to top, the air inlet channel is communicated with the mounting groove, the air collecting device comprises a miniature air pump, a jacking air bag and a sealing block, the sealing block is arranged in the air inlet channel, an airflow inlet is formed in the lower end of the air inlet channel, the jacking air bag is arranged at the airflow inlet, and an airflow channel is formed in the jacking air bag and is communicated with the air inlet channel. The bottom side of the sealing block is connected with the outer side of the jacking air bag, the diameter of the sealing block is gradually changed, the sealing block is in a drop shape, a micro air pump is arranged in the mounting groove, and the air inlet end of the micro air pump faces the upper end of the air inlet channel.

The invention discloses a medium-voltage and low-voltage arc light busbar protection device set. The medium-voltage and low-voltage arc light busbar protection device set comprises a protection device and a busbar. The protection device is connected with a communication system. A single chip microcomputer is arranged inside the protection device. An over-current detection unit, an arc light detection auxiliary unit and a temperature sensor are connected to the single chip microcomputer. The over-current detection unit is connected to the busbar. An arc light sensor is connected to the arc light detection auxiliary unit and connected to the busbar. Meanwhile, a self-adjusting component is added, and the corresponding adjusting action can be made under the control of the single chip microcomputer on the certain specified condition, so that the busbar works continuously, and the probability of the arc light occurrence is remarkably lowered; in addition, the single chip microcomputer is connected with the communication system and finally connected to a mobile terminal, a mobile phone can monitor the protection device set, a worker can more conveniently master the running condition of the protection device set in real time, and damage caused by faults to the protection device set is remarkably reduced.

The invention discloses a device for producing metal powder for 3D printing by gas atomization. The device comprises an atomizing spray tray fixing top plate, an atomizing spray tray, an electromagnetic shielding ring and radio-frequency induction coils from top to bottom. The atomizing spray tray comprises a main atomizing airflow nozzle and an auxiliary protection airflow nozzle. The radio-frequency induction coils include the first coil and the second coil which are disposed coaxially, and the first coil and the second coil are separately controlled by wires. The first coil is located abovethe second coil, and the second coil is a frustum-shaped coil with a cone angle between 30-60 degrees. A melting center is located in the second coil, alpha is less than beta, alpha is 30-50 degrees,and beta is 20-40 degrees. The device for producing the metal powder for 3D printing by gas atomization can effectively narrow the particle size range of the metal powder.

The invention provides a ferroelectric thin film transistor, an organic light emitting array substrate driving circuit and a display device. The ferroelectric thin film transistor comprises a substrate; a bottom electrode layer arranged on the substrate; a ferroelectric layer disposed on one side of the bottom electrode layer back to the substrate, the ferroelectric layer being made of a materialhaving nonvolatile ferroelectric polarization; a semiconductor channel layer disposed on one side of the ferroelectric layer back to the substrate; and a source electrode and a drain electrode arranged on one side of the semiconductor channel layer back to the substrate. The drain electrode is used for being connected with an input end of a light emitting element; the source electrode is used forbeing connected with a power supply signal line; the bottom electrode layer is used for being connected with a control signal line; and a driving circuit is simple. The polarization state of the ferroelectric layer is regulated by applying voltage to the bottom electrode layer, and then the concentration and resistance of carriers in the semiconductor channel layer are regulated through the polarization state of the ferroelectric layer to change the magnitude of the current flowing through an OLED, so that the continuous modulation of the OLED series voltage division and the OLED display withdifferent gray scales are realized, and a control mode is simple.

The invention is applicable to the field of LED lighting, and provides a driving device, a lamp and a driving method. The driving device comprises a regulating and controlling module and a plurality of constant-current output modules, wherein the regulating and controlling module is used for receiving electric signals, used for adjusting driving signals output to the constant-current output modules according to opening frequency that opening actions are detected from the electric signals every time, and used for selectively powering on one or more constant-current output modules according to the driving signals; the opening frequency is the frequency that the opening actions are already detected from the electric signals; the constant-current output modules are used for outputting constant direct current to the LED lamp when being selectively powered on by the driving signals. Thereof, when the opening action is executed each time, the regulating and controlling module reselects that constant direct current is output to the LED lamp from which constant-current output modules, so that the magnitude of the direct current flowing into the LED lamp is changed, and the brightness of the LED is adjusted.

The invention discloses a high-transparency LED reflector lamp. The high-transparency LED reflector lamp comprises a reflector lamp main body, wherein the upper end of the reflector lamp main body isequipped with a lamp post; the side surface inside the lamp post is fixedly equipped with a radiator; one end of the radiator is fixedly equipped with a lamp bulb; a heat dissipation hole is formed inthe center inside the radiator; the side surface of the radiator is equipped with a gas exchange hole; folding plates are fixedly mounted on the outer surfaces of the two sides of the gas exchange hole; the outer surface of one end, close to the lamp bulb, of the lamp post is fixedly equipped with a lampshade; and a convex mirror is arranged between the lampshade and a lamp bulb. According to thehigh-transparency LED reflector lamp disclosed by the invention, the radiator, the convex mirror and a potentiometer are arranged, so that separation and gas exchange are performed on heat generatedinside the reflector lamp main body and outside air, and therefore, a heat dissipation process is convenient; and light can be focused, so that light transparency is improved; and finally, illumination intensity can be regulated according to a using condition, so that a better using prospect is brought.

The invention belongs to the field of quick inspection instruments. The invention relates to an electric energy meter incoming and outgoing line reverse connection quick inspection instrument. In thecase of power connection, reverse connection often occurs due to large workload of power workers. Influence on electricity consumption of residents or enterprises, the problem that the use requirementcannot be met is solved; proposed now is the following scheme, the inspection instrument comprises an inspection instrument body, wherein the inspection instrument body is of a hollow structure; a mounting base is arranged at the bottom end of the inner wall of the inspection instrument body; a rotating motor is arranged on the mounting base; the rotating motor is connected with a driven shaft through an output shaft; a movable through hole is formed in the inspection instrument body; the device is reasonable in structure, drives the indication ball to rotate through the rotating motor, can quickly judge whether the incoming and outgoing lines of the electric energy meter are reversely connected or not according to the rotating direction of the indication ball, and can avoid a condition that the rotating direction of the indication ball cannot be judged because the rotating motor rotates too fast because of convenient use through the movement of the conductive part on the conductive coil.

The invention relates to the technical field of metal machining, and discloses a perforating machine for metal workpiece machining. A supporting column is included, the top of the supporting column is fixedly connected with a top cover, the middle of the supporting column is movably in cup joint with a supporting base, one side of the supporting base is fixedly connected with a workbench, the lower portion of one side of the top cover is movably connected with a motor, the bottom of the supporting base is movably connected with a spring, and the bottom of the spring is fixedly connected with a base. According to the perforating machine, workpieces are placed on the workbench for clamping connection, due to the workpieces made of different metal materials, the supporting base compresses the spring to drive the base to descend, so that the air pressure in an air pressure chamber rises from an air pressure channel, an electrified piston drives a sliding pointer to move up and down to change the resistance value of a slide rheostat, and the current obtained by the motor is changed; and corresponding perforating force is adopted for workpieces made of different metal materials, and the problems that due to the single perforating force, time consumed by some metal materials is long, and functions are lost are solved.

The invention relates to a glue squeezing technology, in particular to an electromagnetic drive type glue squeezing machine. By adopting the electromagnetic drive type glue squeezing machine, the problem that the traditional glue squeezing technology is time consuming and labor consuming and is unstable in glue outlet cam be solved. The electromagnetic drive type glue squeezing machine comprises a glue silo and a pistol type housing, wherein a glue outlet is formed at the front end of the glue silo, an external thread is arranged on the outer surface at the back end of the glue silo, a connecting hole is formed at the side part of the pistol type housing, an internal thread is arranged on the inner wall of the connecting hole, and the back end of the glue silo is in threaded connection with the connecting hole; a squeezed glue body is placed in an inner cavity of the glue silo, a magnetic piston is arranged at the back end of the squeezed glue body, a guide wheel is mounted on the side wall of the magnetic piston, and the magnetic piston is in sliding contact with the inner wall at the back end of the squeezed glue body through the guide wheel; and a magnetic coil wound with an electromagnetic coil is arranged in the inner cavity of the pistol type housing. By adopting the brand new glue squeezing driving structure, the problems that the traditional glue squeezing technology is time consuming, labor consuming and is unstable in glue outlet are effectively solved, and the electromagnetic drive type glue squeezing machine is applicable to glue squeezing construction in construction and decoration industry.

The invention relates to a method for replacing blades of an aircraft engine. The method comprises the following steps: cutting off the blades on a low-pressure turbine guider welding assembly; modifying the shape of the replacement blades according to the shape of the welding assembly; assembling the modified replacement blades into the cut low-pressure turbine guider welding assembly to performwelding and positioning; after the replacement blades are completely welded and fixed on the low-pressure turbine guider welding assembly, performing a turn-milling on the end face of the boss of thereplacement blades, and performing a location hole finish machining on the replaced blades; after the location hole finish machining is completed, polishing the parts of the replacement blades which are welded with the front piece and the tail piece of an upper edge plate and a flow deflector until the metal luster is exposed; welding the flow deflector, the front piece, and the tail piece to theupper edge plate of the replacement blades by using a point welding machine. According to the method for replacing blades of the aircraft engine, targeted replacement can be performed on the guide blades of an aero-engine, and the maintenance cost of the engine is reduced.

The invention discloses a mobile transformer substation. The mobile transformer substation is connected with a commercial power terminal and a user terminal. The mobile transformer substation comprises a mobile vehicle and a transformer, the interior of a carriage of the mobile vehicle is divided into a low-voltage chamber, a transformer chamber and a high-voltage chamber, the transformer is arranged in the transformer chamber, the mains supply end is arranged in the high-voltage chamber, the user terminal is arranged in the low-voltage chamber, the transformer comprises a primary end and a secondary end, the primary end is connected with the mains supply end, and the secondary end is connected with the user terminal. The mobile transformer substation further comprises a reactive phase angle detection module and a reactive compensation module. The reactive compensation module comprises a capacitor module and an adjustable inductor. The capacitor module and the adjustable inductor are respectively connected to the secondary end in parallel, the reactive phase angle detection module is installed on a main circuit of the secondary end, the reactive phase angle detection module detectsa main circuit power factor value and transmits a signal to the adjustable inductor, and the adjustable inductor adjusts the inductance value of the adjustable inductor to enable the main circuit power factor of the secondary end to tend to 1.

The invention belongs to the technical field of automobile accessory machining, and particularly discloses an automobile accessory heat treatment device. The automobile accessory heat treatment devicecomprises a rack, a first cooling box, a second cooling box, a positive temperature coefficient thermistor, rotation shafts, ice leaking boxes and X-shaped brackets; the first cooling box is locatedin the second cooling box and provided with a plurality of first through holes, the brackets are located in the second cooling box, the centers of the brackets are fixedly connected with the rotationshafts, and the rotation shafts are rotatably connected to the interior of the second cooling box; the ice leaking boxes are located over the second cooling box, the bottom face of each ice leaking box is provided with a first opening, the first openings directly face the brackets, a magnetic baffle is arranged at each first opening, an electromagnet and a magnet are arranged on the two sides of each magnetic baffle correspondingly, and a limiting block is arranged on each ice leaking box; and the positive temperature coefficient thermistor is arranged in the first cooling box and electricallyconnected with the electromagnets. The heat treatment device with the structure is good in cooling effect and high in cooling speed.

The invention relates to a super-capacitor self-adaptive charging and discharging control system, which comprises a single-chip microcomputer, a charging and discharging circuit, and the super capacitor which are electrically connected in sequence, wherein a control module is arranged in the single-chip microcomputer, the control module is used for controlling the charging and discharging circuit to charge the super capacitor according to the change of the voltage, or controlling the charging and discharging circuit to enable the super capacitor to discharge to the load; when the voltage of the super capacitor is lower than a set value, the control module controls the charging and discharging circuit to charge the super capacitor; or, when the input voltage is lower than the set value, the control module controls the charging and discharging circuit to enable the super capacitor to discharge to the load. The invention further relates to a super-capacitor self-adaptive charging and discharging control method. According to the super-capacitor self-adaptive charging and discharging control system and the super-capacitor self-adaptive charging and discharging control method, intelligent control of different charging speeds is realized, and multistage conversion of the charging speeds can be realized; the single-chip microcomputer is connected into the circuit to monitor the voltage in real time; the current of each branch circuit can be controlled; and a super-capacitor charging mode, a maintaining mode and a discharging mode are freely switched.

The invention discloses a multifunctional electric power meter with a liquid level detection function, which comprises a connecting plate, a displayer is fixedly connected to the upper portion of the front end of the connecting plate, a protection frame is fixedly connected to the lower portion of the front end of the connecting plate, and a transmission mechanism is movably connected into an inner cavity of the protection frame; the front portion of the transmission mechanism is fixedly connected with a display mechanism in a sleeved mode, the rear end of the connecting plate is fixedly connected with a shell, the rear end of the shell is movably connected with a quick-mounting mechanism in a clamped mode, and the middle of the front end of the protection frame is fixedly connected with a cover plate in a clamped mode. According to the invention, by arranging a float bowl, a first connecting rod, a second connecting rod, a transmission mechanism, a display mechanism and a displayer, the electric power instrument has a liquid level detection function and is convenient to use, and by arranging a rotating column and a quick mounting mechanism, when the electric power instrument is mounted, the electric power instrument is preliminarily fixed together with the mounting frame or the mounting box; and the fixing screws are convenient to install and fix.

The invention belongs to the technical field of plane grinding, particularly relates to plane grinding equipment with a rotating mechanism. The plane grinding equipment aims at solving the problems that in the using process of an existing plane grinding device, due to the fact that a workpiece at the upper end of a circular workbench cannot rotate, consequently, the workpiece cannot be effectivelyground, and the workpiece is inconvenient to fix. Based on the following scheme, the plane grinding equipment comprises a workbench and a top vertical plate of the workbench, a vertical cavity is formed in the vertical plate, a lifting structure is arranged in the vertical cavity, a sliding block is connected to the lifting structure, a transverse plate is fixedly installed on the sliding block,a grinding motor is installed at the bottom of the transverse plate in a sliding mode, a grinding head is connected to the grinding motor, an adjusting mechanism is connected to the transverse plate,the adjusting mechanism is connected with the grinding motor, a metal pipe is rotationally connected to the workbench, and a disc box is fixedly installed at the top of the metal pipe. The plane grinding equipment is convenient to operate, a workpiece is conveniently fixed, meanwhile, the workpiece can be driven to rotate, grinding is convenient, and therefore, the grinding efficiency is improved.

The invention provides a driving circuit capable of selecting an LED output current by jacks. The driving circuit comprises an input power supply, an EMI circuit, a rectifying circuit and a control output regulation circuit connected in sequence; the control output regulation circuit comprises a dimming driving chip; the dimming driving chip is connected with an MOS transistor Q1 and a sampling resistor R6; the output end of the MOS transistor Q1 and the output end of the rectifying circuit are jointly connected with multiple output terminals; an MOS transistor Q2 and an MOS transistor Q3 are connected between the dimming driving chip and the sampling resistor R6; the MOS transistor Q2 is connected with a resistor R4; the MOS transistor Q3 is connected with a resistor R5; a first comparator is connected between the MOS transistor Q2 and a resistor R2; and a second comparator is connected between the MOS transistor Q3 and a resistor R1. According to the driving circuit, the LED output current can be selected by selection of the jacks, so that the applicable range of the power supply drive can be expanded.

A dimming LED constant-current driving circuitis used for providing working voltage for a dimming module through a voltage dividing module so as to enable the dimming module to output a pulse modulation and demodulation signal to a constant-current driving module to change the magnitude of current output by the constant-current driving module. Further, the input current of a series LED lamp group connected with the output end of the constant-current driving module can be controlled, and the lighting brightness of the series LED lamp group can be changed. A sampling module is used for sampling the current of the series LED lamp group. The constant-current driving module no longer increases the current of the series LED lamp group when the current of the series LED lamp group reaches a rated current value, so that over-current of the series LED lamp group is avoided.

A ferroelectric thin film transistor, an organic light emitting array substrate driving circuit and a display device. The ferroelectric thin film transistor comprises: a substrate; a bottom electrode layer arranged on the substrate; a ferroelectric layer arranged on the side of the bottom electrode layer facing away from the substrate, and the material of the ferroelectric layer is a material with nonvolatile ferroelectric polarization; A semiconductor channel layer arranged on the side of the ferroelectric layer facing away from the substrate; a source electrode and a drain electrode arranged on the side of the semiconductor channel layer facing away from the substrate; the drain electrode is used to connect to the input end of the light-emitting element; the source electrode It is used for connecting with the power signal line; the bottom electrode layer is used for connecting with the control signal line; the driving circuit is simple. The polarization state of the ferroelectric layer is adjusted by applying a voltage to the bottom electrode layer, and then the concentration and resistance of carriers in the semiconductor channel layer are regulated through the polarization state of the ferroelectric layer, and the current flowing through the OLED is changed to realize OLED. Continuous modulation of serial voltage division and OLED display with different gray scales, the control method is simple.

The invention discloses a multifunctional lens with collimation and coupling functions. The collimating lens and the coupling lens are both arranged between two stand columns. Second connecting platesare arranged on the side walls of the collimating lens and the coupling lens; the two second connecting plates are both rotationally connected with the left stand column. The connecting block is an iron-nickel alloy block; the connecting block is magnetically connected with the electromagnet; six color-changing LED shadowless lamps are arranged on the upper surface of a mounting plate at equal angle and correspond to positions of a placing plate, an adjustable resistor is arranged on the upper surface of the mounting plate, the output end of the adjustable resistor is electrically connected with the input end of the color-changing LED shadowless lamps, light can be collimated and coupled, the imaging effect is good, the distance between a specimen and a lens can be adjusted, the color ofa light source can also be adjusted, and the optimal imaging quality is guaranteed.