4723 results about "Driving current" patented technology

The invention relates to the technical field of intelligent control, provides a flow regulating valve servo force control method and system based on a force sensor, and aims to solve the technical problems of response delay, weak overshoot suppression capability and poor long-term operation stability. The method comprises the following steps: acquiring a servo driving current data set and a valve displacement track data set of a target regulating valve; performing pressure feature mapping processing on the servo driving current data set to generate a pressure fluctuation feature set corresponding to the driving current waveform data; the pressure fluctuation characteristic set and the valve displacement track data set are input into a preset force control decision model for dynamic matching processing, and a servo control instruction set is generated; executing multi-stage dynamic adjustment operation on a servo driving unit of the target adjusting valve according to the servo control instruction set, and generating real-time pressure balance state data; and iteratively updating the dynamic matching processing parameters of the force control decision model based on the deviation value of the real-time pressure balance state data and the preset pressure reference value.

An electric power assisted steering assembly comprises a steering mechanism which operatively connects a steering wheel to the roadwheels of a vehicle, a torque sensing means adapted to produce a first output signal indicative of the torque carried by a portion of the steering mechanism, a means for producing a second output signal indicative from a signal indicative of the angular velocity of the portion of the steering mechanism, an electric motor operatively connected to the steering mechanism, a signal processing unit adapted to receive the two output signals and to produce therefrom an overall torque demand signal representative of a torque to be applied to the steering mechanism by the motor, and a motor drive stage adapted to provide a drive current to the motor responsive to the torque demand signal. The overall torque demand signal includes a damping component that is dependent upon the second output signal. The means for producing the yaw damping component includes a filter having one pole and one zero, and in use the second signal is passed through the filter to produce the damping component, the frequency of the pole and zero being selected such that the filter provides a band between the pole and zero within which the phase of the filtered second signal and the velocity signal are further out of phase or in phase than within the band.

The invention relates to the technical field of flexible screens, and discloses a flexible screen brightness control method and device based on region segmentation, and the method comprises the steps: carrying out the multi-view image collection of a plurality of bending regions of a flexible display screen, obtaining target image data, and calculating the deformation compensation partition data of the flexible display screen; gridding brightness sampling is carried out on the deformation compensation partition data to generate brightness uniformity characteristic data, LED driving parameter calculation is carried out based on the brightness uniformity characteristic data, and a driving compensation matrix is output; inputting the driving compensation matrix into a second-order state observer for real-time current estimation and temperature feedback, and generating a partition driving control signal; and performing multi-region collaborative optimization on the partition driving control signal to realize brightness uniformity control of the flexible display screen in different bending states. According to the method, the influence of temperature drift on the display uniformity is eliminated, the stability of the driving current is improved, and the display deviation caused by temperature change is remarkably reduced.

The embodiment of the invention provides a pixel circuit and a display module, and relates to the field of display panels. The pixel circuit comprises a driving module which is electrically connected with a first electrode of a light-emitting element and is used for driving the light-emitting element to emit light; the first end of the shunt branch is electrically connected with the first electrode of the light-emitting element, the second end of the shunt branch is electrically connected with a first reference voltage signal line, and the shunt branch is used for transmitting part of driving current provided by the driving module to the first reference voltage signal line. According to the pixel circuit and the display module provided by the embodiment of the invention, the problem that the display brightness of a display panel is not uniform can be fully improved, so that the display effect and the use performance of the display panel are effectively improved.

The invention provides a wavelength adjustment method, device and equipment for an LED detection light source and a storage medium, and the method comprises the steps: transmitting multiband incident light through an LED light source array, and receiving reflected light or transmission light of a detection object through a photoelectric detector array, thereby obtaining the spectral feature data of the detection object. And according to the spectral feature data, calculating a signal-to-noise ratio value and a feature response difference value of each wavelength interval, and performing multi-target parameter optimization in combination with a background noise coefficient of the detection object to obtain an optimal detection wavelength parameter group. And then, through linkage control of the driving current and the chip temperature of the LED light source array, matching output signals of multiple groups of wavelengths are obtained. And adjusting the wavelength of the LED light source array according to the compensated optimal detection wavelength parameter group. According to the method, adaptive wavelength adjustment can be carried out according to the spectral characteristics of the detected object, light source output is optimized, the signal-to-noise ratio is improved, the detection precision is further improved, and the method has remarkable advantages in optical detection application in a complex environment.

A display device and its driving method are provided. The display device includes a display panel. The display panel includes pixel circuits arranged in multiple rows. Each pixel circuit includes a light-emitting control transistor and a driving transistor. The light-emitting control transistor is used to control a corresponding light-emitting element to enter a light-emitting stage; and the driving transistor is used to provide a driving current for the corresponding light-emitting element. A driving process of the display panel includes a first stage and a display stage. The first stage is located at least before or after the display stage. In the first stage, at least one of light-emitting control transistors and driving transistors in each row of pixel circuits is turned off. A duration of the first stage is t, and a data refresh frequency of the pixel circuits in the display stage is f, t≤1 / f.

The present application provides a display panel and a display device. Pulse width modulation modules of a plurality of sub-pixels included in the same sub-pixel group receive the same frequency sweep signal, and pulse width modulation modules and the pulse amplitude modulation modules of the plurality of sub-pixels included in the same sub-pixel group receive the same light emission control signal. The start time when pixel driving circuits of at least two of the sub-pixel groups provide flow paths for corresponding driving currents according to corresponding light emission control signals is different.

The embodiment of the invention discloses an abnormity monitoring system applied to a plasma etching machine. The abnormity monitoring system comprises constant current source equipment, a coil, a coil detection circuit and a controller, and the constant current source equipment is configured to output driving current according to preset etching process parameters; the coil is configured to generate a magnetic field in the etching cavity in response to the input of the driving current to guide the plasma to move towards the direction of the substrate so as to etch the substrate; the coil detection circuit is configured to detect coil state data of the coil; the controller is configured to generate device service information based on the coil state data. According to the embodiment of the invention, the working state of the coil is monitored through the coil state data, and the actual condition of the coil is reflected through the equipment maintenance information, so that a user can quickly know whether the coil is in an abnormal state, the user is helped to quickly position the maintenance direction, the user is prevented from detaching and maintaining the coil from the etching cavity, and the user experience is improved. And various resource investments wasted due to the fact that the coil is abnormal do not exist.

The invention relates to the technical field of display screen control, and discloses an LED display screen intelligent control system and method, and the system comprises a module M1 which is an environment perception and collection module; the module M2 is a dynamic display optimization module; the module M3 is a multi-mode cooperative control module; the module M4 is an intelligent fault tolerance module; the module M5 is an energy management module; the method comprises the following steps: S1, collecting data in real time through an environment sensing and collecting module; s2, according to environmental parameters; s3, designing a redundant drive circuit; s4, realizing partition management of the display content through a multi-mode cooperative control module; s5, the intelligent fault tolerance module automatically switches a standby communication link; s6, the driving current is dynamically adjusted according to the environment temperature and the display load; according to the invention, the adjustment parameters can be preloaded to the display driving main control unit, so that rapid and accurate adaptive adjustment of the brightness, color temperature and color gamut of the display screen is realized.

A method includes: providing a modulation circuit including a first resistive element, a second resistive element and a third resistive element; providing a memory array and a regulator connecting the modulation circuit to the memory array, wherein the regulator includes a transistor; determining an operation mode of the memory array; generating a first voltage at a drain terminal of the transistor, wherein the first voltage corresponds to a positive, negative zero temperature coefficient according to a first resistance ratio and a second resistance ratio; during a read operation, providing a first driving current to the memory array in response to the first voltage corresponding to the positive temperature coefficient; and during a write operation, providing a second driving current to the memory array in response to the first voltage corresponding to the negative temperature coefficient.

Provided are a display substrate, a driving method thereof, and a display apparatus. The display substrate includes multiple sub-pixels, a sub-pixel includes a pixel drive circuit and a light emitting device, the pixel drive circuit includes an initial signal line (INIT), a reset signal line (Reset) and multiple transistors, the initial signal line includes a first branch (INIT-1). Multiple transistors include a drive transistor, a first reset transistor and a second reset transistor, the drive transistor provides a drive current to the light emitting device, the first reset transistor resets a gate of the drive transistor through the INIT-1 under control of the reset signal line. The second reset transistor resets a first terminal of the light emitting device through the INIT-1 under control of the reset signal line. The first reset transistor and the second reset transistor in a same sub-pixel are controlled by a same reset signal line.

An electric vehicle battery control system including a first electric motor configured to propel a vehicle in a drive mode in response to a drive current, a second electric motor operative to generate a back electromotive force voltage in a fault mode, a battery, having an open circuit battery discharge voltage, for generating the drive current for coupling to the first electric motor, and a vehicle controller for limiting the drive current in response to a difference between the back electromotive force voltage and the open circuit battery discharge voltage being less than a threshold voltage difference.

The invention provides a focus-adjustable liquid double telecentric lens and intelligent production equipment, and relates to the technical field of optical lenses. The focus-adjustable liquid double telecentric lens comprises a first lens, a second lens, a third lens, a liquid lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object space to an image space along an optical axis; the first lens is a biconvex lens with positive focal power, the second lens is a biconvex lens with positive focal power, the third lens is a biconcave lens with negative focal power, the fourth lens is a biconcave lens with negative focal power, the fifth lens is a biconvex lens with positive focal power, and the sixth lens is a biconvex lens with positive focal power. Wherein the focusing position of the focusable liquid double telecentric lens is changed by adjusting the driving voltage or the driving current of the liquid lens, and rapid focusing under different working distances is completed. According to the embodiment of the invention, the system is small in size, and is excellent in imaging quality in a large depth-of-field range.

A brake apparatus includes a first motor associated with a first brake for braking a first wheel, a first drive controlling a driving current of the first motor to brake the first wheel, a second motor associated with a second brake for braking a second wheel, a second drive controlling a driving current of the second motor to brake the second wheel, a first processor integrated with the first drive and receiving an output of a first pedal sensor detecting movement of a brake pedal, and a second processor integrated with the second drive and receiving an output of a second pedal sensor detecting the movement of the brake pedal. The first processor transmits a brake signal to the first drive based on the output of the first pedal sensor. The second processor transmits a brake signal to the second drive based on the output of the second pedal sensor.

A display device according to one or more embodiments of the present disclosure includes: a display panel including a plurality of pixels; and a panel driver configured to drive the display panel, wherein each of the pixels includes: a first light emitting element having a first viewing angle; a second light emitting element having a second viewing angle; a pixel circuit configured to generate a driving current; a first transistor configured to provide the driving current to the first light emitting element in response to a first select signal; and a second transistor configured to provide the driving current to the second light emitting element in response to a second select signal, and wherein, in a mode switching frame period between a first mode and a second mode, the panel driver is configured to sequentially provide the first and second select signals to the pixels on a row-by-row basis.

A lighting apparatus includes a light source plate, multiple types of LED modules, a switch connector, a manual switch, a controller and a main housing. The multiple types of LED modules respectively emit lights of different parameters. The switch module is used for holding a state among multiple candidate states. The switch connector is disposed at least partially on a back side of the light source plate. The manual switch is coupled to the switch module via the switch connector to change the state. The controller is coupled to the switch module for determining a set of driving currents supplied to the multiple types of LED modules to emit a mixed light of a required parameter corresponding to the state of the switch module. a main housing for holding the light source plate. The main housing has a lateral wall.

The invention relates to a system and method for rapidly establishing steady state vacuum chamber pressure. According to the system, the set value of the vacuum valve is fixed, and the driving current of the MFC electromagnetic valve is used for adjusting the pressure of the cavity, so that the pressure is stabilized more quickly. The system can operate in a training mode and an inference mode. In the training mode, a PID controller is used for determining set values of an MFC and a vacuum valve; in an inference mode during substrate processing, these settings are quickly invoked and executed, thereby achieving efficient and stable pressure control.

The invention relates to a COB LED self-adaptive thermal management system, and aims to improve the heat dissipation performance and prolong the service life of a COB LED through an intelligent temperature monitoring and adjusting means. The system comprises an infrared thermal imaging module which is used for obtaining real-time thermal images of a COB LED packaging substrate and an LED unit; the image processing module is used for analyzing the acquired thermal image and identifying a hot spot area; and the current adjusting module is used for dynamically adjusting the driving current of the corresponding LED unit according to the identified hot spot area so as to slow down the generation of hot spots. If the current adjustment cannot sufficiently reduce the hot spot temperature, the cooling mechanism control module starts a cooling mechanism, including adjusting the fan speed, prompting a user to optimize external environment heat dissipation conditions, or partially shutting down the LED unit in extreme cases to reduce heat generation. According to the system, by combining real-time thermal imaging, intelligent current regulation and cooling mechanisms, the COB LED system is ensured to maintain a stable temperature in a high-efficiency working state, so that the overall light output efficiency is improved, and the service life of the LED is prolonged.

The invention relates to an LED light source brightness homogenization control method, device and equipment. The method comprises the following steps: acquiring driving current, PWM duty ratio and light intensity signals of each LED unit in an LED array, and establishing an LED characteristic data set; carrying out working state feature extraction to obtain LED working state data, and inputting the LED working state data into an LED brightness prediction model to carry out light intensity value prediction to obtain a predicted light intensity value; performing spectral analysis and resampling calculation on the predicted light intensity value and the actually measured light intensity value to obtain a state judgment result of the LED unit; dividing the LED array into a plurality of driving groups, and performing current sharing control on each driving group through energy adjustment of an energy storage capacitor to obtain an LED driving current parameter; and performing compensation region division on the LED array to obtain a plurality of compensation regions, and performing calculation through a BSA algorithm to obtain a brightness homogenization compensation parameter of each compensation region. According to the invention, the overall display quality and operation reliability of the LED array are improved.

Provided are a pixel driving circuit (110) and a driving method, a display panel (610) and a display device (900). The pixel driving circuit (110) includes: a driving sub-circuit (111) connected to a light-emitting element (120); a data writing sub-circuit (112) configured to write a data signal from the data signal terminal (Vdata) into the driving sub-circuit (111) and apply the data signal to a leakage current compensation point (M), under control of the scanning signal terminal (Vscan); and a light-emitting control sub-circuit (113) configured to control the driving sub-circuit (111) to output a driving current related to the data signal to the light-emitting element (120) under control of the light-emitting control signal terminal (EM). In a process of emitting light by the light-emitting element (120), a voltage of a control electrode of the driving sub-circuit (113) is compensated by a voltage of the leakage current compensation point (M).

A display substrate and a display panel are provided. The display substrate includes: a base substrate; and a plurality of sub-pixels. Each sub-pixel includes a light-emitting element and a pixel circuit; the pixel circuit includes a driving circuit, a data writing circuit, a first control circuit, a second control circuit, and a light-emitting control circuit; the driving circuit is configured to control the driving current flowing through the light-emitting element; the light-emitting control circuit is configured to apply the driving current to the light-emitting element; the first control circuit is configured to write a reference voltage into the driving circuit; the second control circuit is configured to write an initial voltage into the first electrode of the light-emitting element; and orthographic projections of at least part of pixel circuits of every two adjacent sub-pixels in a same row of sub-pixels on the base substrate are mirror-symmetrical.

The invention discloses a temperature measurement chip circuit compatible with platinum thermal resistance, NTC and digital semiconductor temperature measurement. According to the circuit, three temperature measurement principles are fused, a single-chip implementation scheme of temperature measurement and acquisition of PT100 / PT1000 / NTC thermistors outside a multi-channel chip and temperature measurement of PN nodes inside the chip is fused, and a time division multiplexing mode is adopted, so that the measurement matching performance among channels is improved, and the power consumption is reduced. During calibration, the internal PN node array temperature measurement channel is calibrated firstly, error correction is performed on the analog front-end circuit, and then the external temperature measurement channel is calibrated by using the precision of the PN node array, so that the calibration efficiency is improved. Reasonable reference voltage is adopted for different internal and external temperature measurement circuits, and for an external temperature measurement channel, differential voltage between two pins is selected, so that the influence caused by driving current deviation is counteracted in calculation. For an internal PN node temperature measurement channel, an internal low-temperature-drift reference voltage VREF is selected, and the influence caused by the reference voltage deviation is counteracted from calculation.

The invention provides a three-loop on-chip integrated low-dropout linear voltage regulator, which comprises a three-port source follower type voltage follower, which comprises a first anti-phase end, a normal phase end, a second anti-phase end and a first output end; the error amplifier is used for comparing a reference voltage with an output voltage so as to provide a first control signal for the first anti-phase end; the self-feedback bias module is used for receiving an internal voltage signal of the three-port source follower type voltage follower so as to provide a second control signal for the second anti-phase end; the grid electrode of the power tube is connected with the output end, the source electrode is connected with the power supply voltage, and the drain electrode serves as a second output end and is used for receiving the adjusting signal output by the first output end; the output driving current of the power tube is adjusted based on the adjusting signal; and the bias module is used for providing bias voltage for the three-port source follower type voltage follower and the error amplifier. The transient response performance of the voltage stabilizer can be improved under the condition of no off-chip large capacitance.

The invention discloses a large-height overhead working truck leveling system and a control method.The system comprises a platform leveling subsystem, a hydraulic compensation subsystem and a PLC control subsystem, and the platform leveling subsystem comprises a crank arm, a leveling oil cylinder, a first connecting rod, a second connecting rod and a platform bracket; the hydraulic compensation subsystem comprises a balance valve, a leveling proportional valve, a one-way valve, a compensation proportional valve, an overflow valve and a compensation pump. The PLC control subsystem comprises a CAN communication module, a CPLD logic control module, a PWM driving module, a digital driving module, an angle sensor and a pressure sensor. A digital driving module is used for controlling a compensation pump, a PWM driving module is used for controlling a compensation proportional valve, and pressure adjustment is carried out; a PWM driving module is used for controlling a leveling proportional valve and a leveling platform; and the PWM driving module is used for adjusting the driving current of the proportional electromagnet of the leveling proportional valve. According to the invention, the pressure loss in the leveling pipeline can be compensated in real time, the pressure in the leveling pipeline is kept constant, and the response speed of the leveling system is improved.

The invention provides a power conversion device and a control method thereof, and a switch driving chip, and relates to the technical field of switch control, the power conversion device comprises a controller, a first switch tube and a second switch tube, the controller provides a first driving current for a grid electrode of the first switch tube when a turn-off moment of the first switch tube arrives, and the controller provides a second driving current for a grid electrode of the second switch tube when the turn-off moment of the second switch tube arrives; when the voltage difference of the first switch tube is greater than or equal to a first threshold value, a second driving current is provided for the grid of the first switch tube so as to control the voltage of the grid of the first switch tube to rise; and when the voltage difference of the first switching tube is greater than or equal to a second threshold value, or the time duration for providing the second driving current is greater than or equal to a time threshold value, providing a third driving current for the grid electrode of the first switching tube to control the voltage of the grid electrode of the first switching tube to drop to turn off. According to the invention, the generation of voltage stress and EMI can be reduced, the turn-off speed of the first switching tube is improved, the turn-off loss is reduced, and the applicability is high.

The invention discloses an electronic lock control device and method, a storage medium and computer equipment. The device comprises a controller used for responding to a locking instruction or an unlocking instruction of an electronic lock and outputting a motor control signal; the motor driving module is connected with the controller and is used for receiving the motor control signal and outputting a motor driving signal; the motor is connected with the motor driving module and is used for operating based on the motor driving signal so as to drive a locking mechanism of the electronic lock to move; the current sampling module is connected between the motor driving module and the motor and is used for collecting motor driving current generated when the motor driving signal drives the motor; and the current detection module is connected with the current sampling module and the controller and is used for detecting the motor driving current and sending a detection signal of the motor driving current to the controller, so that the controller judges whether the electronic lock is locked in place or unlocked in place according to the detection signal of the motor driving current. The device can improve the state recognition accuracy of the electronic lock.

The invention relates to the technical field of laser control, in particular to a laser power correction method and system. The laser power correction method comprises the following steps: acquiring an actual power value corresponding to an actual current value of a laser; fitting based on the actual current value and the actual power value to obtain a fitting broken line; wherein the fitting broken line comprises a plurality of fitting straight lines, and the fitting straight lines correspond to different power intervals of the laser; calculating a proportionality coefficient according to the fitting straight line and a proportionality coefficient calculation formula; according to the proportionality coefficient, a current correction value calculation formula and a power set value of the laser, a current correction value corresponding to the power set value is obtained through calculation, and the current correction value is stored. The current correction value is used as the driving current of the laser, so that the actual output power of the laser is the power set value of the laser, and the accuracy of the laser output power is improved.

A lighting apparatus includes a driver module, multiple light source modules and a unified fastener. The driver module includes a driver circuit and a driver housing. The driver circuit converts an external power source to multiple driving currents. Each light source module has a light source and a light housing. The light housing encloses the light source and provides a light opening for a light of the light source to pass through. Each light source has a power wire. The power wires of the light sources have multiple wire ends coupled to the unified fastener to receive the driving currents of the driver circuit.

According to an aspect of the present disclosure, an organic light emitting display apparatus includes an organic light emitting diode; a driving transistor which supplies a driving current to the organic light emitting diode; and a plurality of switching transistors to transmit a reference voltage and a data voltage to a gate electrode of the driving transistor, respectively. According to the present disclosure, one frame is divided into a refresh period in which a data voltage is written and a hold period in which the data voltage written in the refresh period is held. The refresh period includes an initialization period, a sampling period, a programming period, and an emission period, and the sampling period and the programming period may be separate from each other.

The invention provides a Mini LED backlight module system for improving the color gamut range of display equipment, which is characterized in that firstly, high-precision electronic control and an intelligent feedback mechanism are integrated, a distributed driving framework is adopted, and refined light source adjustment is realized; secondly, the light source ratio is adjusted in real time by dynamically analyzing the image content, and the color expression range is widened; then, continuously monitoring the driving current through a closed-loop feedback system, and adopting a self-adaptive correction driving strategy to effectively inhibit the interference of environment and device aging on color stability; finally, through temperature management, power consumption and heat dissipation requirements are dynamically balanced, and stable operation of the system is ensured; in addition, a low-delay processing architecture is adopted, and video signals and backlight response are seamlessly connected. Through deep collaboration of software and hardware, the problems of poor uniformity, thermal color cast and response delay caused by color gamut limitation and aging in the prior art are systematically solved, and the display performance is remarkably improved.