3477 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.

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 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 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.

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.

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.

The invention relates to the technical field of motors, and discloses a high-temperature-resistant direct-current coreless gear motor and a test system, and the system comprises a temperature monitoring module, a current regulation and control module, a heat dissipation optimization module, a load response module, a cloud analysis module and a virtual verification module. By arranging the temperature monitoring module, multi-dimensional temperature data during operation of the motor can be acquired in real time, and a temperature distribution diagram can be generated, so that the system can comprehensively sense the internal thermal state of the motor and accurately identify local overheating risk points, thereby improving the operation reliability and safety of the motor under a high-temperature working condition; through cooperative operation and closed-loop control of the current regulation and control module, the heat dissipation optimization module and the load response module, according to real-time temperature and load changes, driving current parameters and heat dissipation resource distribution can be dynamically adjusted, and the heat dissipation efficiency is improved. And the output performance and the torque stability of the motor under high-temperature and high-load conditions are ensured.

A display driving circuit includes a pixel circuit array including a plurality of pixel circuits arranged in a matrix, each of the plurality of pixel circuits storing received pixel data and providing a driving current corresponding to the pixel data to an emission device, an interface circuit configured to receive a partial update command and partial update data from a host, a row driving circuit configured to provide write clock signals to first pixel circuits included in one or more update row of the pixel circuit array, based on a update area signal generated based on update area information included in the partial update command, and a data driving circuit configured to provide update pixel data to each of the update pixel circuits among the first pixel circuits, based on the partial update data.

The invention discloses an LED display screen brightness uniformity correction method and system based on current feedback, and relates to the technical field of brightness correction.The method comprises the steps that firstly, a vertical blanking period time sequence empty window is utilized, high-low double-amplitude detection current is injected into LED pixels, and voltage responses in different excitation states are obtained on the premise that normal display is not interfered; then, constructing a state decoupling model based on a reference I-V-T characteristic spectrum, and deeply analyzing coupled electrical signals into independent real-time junction temperature and aging factors by using differential sensitivity characteristics of voltage to temperature and aging; and then, on the basis of the physical state parameters, reverse compensation operation is performed in combination with an original gray instruction and a reference L-I brightness model, and target driving current capable of counteracting thermal quenching and aging attenuation is dynamically deduced. In this way, the correction problem caused by deep coupling of temperature drift and device aging can be effectively solved, and therefore self-adaptive high-precision brightness uniformity correction in the full life cycle of the display screen is achieved.

The invention provides an electric tool and a control method thereof, and when a driving current is greater than a preset current value, a control circuit starts timing of a temperature protection timing value, and obtains a heat accumulation value. In the timing process, the control circuit updates the heat accumulated value according to the obtained driving current. And when the temperature protection timing value reaches the preset time length or the heat accumulation value reaches the heat threshold value, it shows that the temperature of the motor is too high, and the control circuit controls the motor to stop running. Therefore, the motor can be protected in time when the motor is overheated. And the control circuit determines whether the temperature of the motor is too high according to the driving current, so that the situation that the control circuit cannot respond to overheat of the motor in time for temperature protection due to the fact that the heat dissipation performance of the control circuit and the heat dissipation performance of the motor are different, and then the motor is damaged can be prevented, and effective temperature protection is achieved for the electric tool.

A pixel circuit and a display module, and relate to the field of display panels. The pixel circuit includes: a driving module electrically connected to a first electrode of a light-emitting element and configured to drive the light-emitting element to emit light; and a shunt branch. A first terminal of the shunt branch is electrically connected to the first electrode of the light-emitting element, a second terminal of the shunt branch is electrically connected to a first reference voltage signal line, and the shunt branch is configured to transmit part of a driving current provided by the driving module to the first reference voltage signal line.

Disclosed are a backlight device for a display that provides a backlight for displaying an image and a current control integrated circuit thereof. According to the backlight device and the current control integrated circuit thereof, a driving current can be controlled so as to allow light emitting blocks to maintain light emission for one frame or more, and the luminance of a backlight can be uniformly and precisely controlled in an entire luminance change area.

The invention relates to the field of digital power supply control, and provides a parameterized digital control method and system suitable for a wide power range charging module, and the method comprises the steps: collecting an original sensor signal, constructing a slow working condition feature vector through adaptive-temperature drift compensation, and driving a physical constraint reference prediction model to generate a second baseline behavior parameter vector; monitoring a gate driving current by using a gate-drain capacitor, extracting a transient characteristic value, and quantifying the transient characteristic value into a ZVS quality factor; the slow working condition feature vector and the ZVS quality factor are fused, a correction vector is generated through an adaptive prediction model, a control parameter vector is generated in combination with a second baseline behavior parameter vector, and online updating is carried out according to feedback; executing hardware physical limit constraint according to the security constraint set, generating security parameters and abnormal flag bits, and writing the security parameters and the abnormal flag bits into a hardware register in a fixed-point manner after cooperating with ZVS quality factor arbitration. According to the method, physical constraint prediction and transient perception correction are fused, and a digital control system considering dynamic response, drift compensation and safety redundancy is constructed.

A pixel includes a light-emitting element including a first electrode and a second electrode connected to a low power line which transmits a low power voltage, a pulse width modulator which controls an emission time duration of the light-emitting element based on a data voltage and a sweep signal, and a constant current generator which supplies a driving current having a constant level to the light-emitting element based on a constant current generation voltage. The sweep signal has a first high voltage level in a non-emission period, and is boosted to a second high voltage level, which is higher than the first high voltage level, before decreasing to a low voltage level lower than the first high voltage level in an emission period.

The present application relates to a semiconductor temperature control device and a control method thereof. The device includes: a temperature detection module, which is used to perform multi-point detection on the temperature field of a semiconductor laser to obtain multiple temperature measurement values, so as to perform thermal field simulation calculation on the temperature distribution of the semiconductor laser to obtain a temperature field distribution matrix; a heat flow analysis module, which is used to perform heat flux density calculation on the semiconductor laser according to the temperature field distribution matrix to obtain the heat flux density distribution, so as to perform multi-channel pulse width modulation processing on the thermoelectric refrigeration component to obtain a temperature regulation drive signal; a closed-loop control module, which is used to perform adaptive regulation processing on the thermoelectric refrigeration component according to the temperature regulation drive signal to generate a temperature regulation feedback signal, so as to perform closed-loop adjustment on the drive current of the thermoelectric refrigeration component until the thermoelectric refrigeration component maintains the temperature of the semiconductor laser within the target temperature range based on the adjusted drive current. The use of the device can ensure the dynamic balance of temperature regulation.

The invention provides a temperature control system and method, electronic equipment and a storage medium, and relates to the technical field of semiconductor laser temperature control. The temperature control system is used for the vertical-cavity surface-emitting laser, and comprises a temperature measurement assembly which is used for measuring the real-time temperature of the vertical-cavity surface-emitting laser and providing a feedback signal; the digital PID algorithm assembly is connected with the temperature measuring assembly and is used for determining a control signal according to the feedback signal and a set temperature; and the power driving assembly is connected with the digital PID algorithm assembly and is used for providing driving current according to the control signal so as to adjust the temperature of the vertical cavity surface emitting laser. According to the invention, a four-wire system wiring method is adopted to eliminate lead resistance errors, and a high-precision element is matched, so that the temperature detection precision reaches 2mK, and the accuracy is remarkably improved.

The invention relates to the technical field of screen driving chips, and discloses a mobile phone screen driving chip system which comprises a parameter fusion module, a current field modeling module, a cooperative driving module, a dynamic compensation module and a self-consistency verification module. The method comprises the steps of generating a dynamic quantum efficiency field through fusion of a sensor and a deep neural network, solving a nonlinear current field equation to output a driving current gradient, constructing a weight matrix to optimize multi-screen cooperative data transmission, monitoring a brightness decay reverse correction boundary and a coupling coefficient in real time, and performing online iteration optimization parameter feedback modeling to realize a closed loop. Full-link closed-loop driving control is constructed through dynamic quantum efficiency field fusion, nonlinear discrete current field modeling, weight matrix compression transmission, time-varying attenuation factor reverse correction and self-consistent parameter optimization, and screen display uniformity enhancement, multi-screen cooperation efficiency improvement, aging effect real-time compensation and system long-term stability guarantee are achieved.

The invention relates to the technical field of motor fault diagnosis, and discloses a multi-degree-of-freedom resonant excitation motor dynamic vibration test system and a test method, the system injects a specific harmonic current into a motor through closed-loop control and calculation and a high-bandwidth harmonic injection driver, so that the actual vibration of the tested motor tracks a preset target vibration profile in real time. In the testing process, the cross-spectral density of multi-point vibration signals is analyzed, and a transmission path and a collection area of vibration energy in a motor structure are calculated; and meanwhile, the electromagnetic impedance and the mechanical impedance of the motor are identified and decoupled on line by superposing a broadband disturbance signal in the driving current. In combination with energy flow analysis and an impedance decoupling result, the method can accurately position a vibration abnormal position, clearly causes whether a fault source is from mechanical structure characteristic change or electromagnetic part performance change from a physical level, and realizes deep and accurate diagnosis of the dynamic characteristics of the motor.