707results about How to "High compensation accuracy" patented technology

An exemplary active matrix organic light emitting diode (OLED) display includes a data line, a current sensing line, a power line and a plurality of pixels all electrically coupled to the data line, the current sensing line and the power line. During a data current is writing to a selected one of the pixels, the selected pixel draws a current from the current sensing line, and the data line supplies a particular data voltage to the selected pixel according to the drawn current from the current sensing line until the drawn current matched with the data current; the other non-selected pixels draw currents from the power line for light-emission. Moreover, a pixel circuit and a data current writing method adapted for the above-mentioned active matrix OLED display also are provided.

A digital predistorter compensates for nonlinear distortion of a power amplifier using a power series model. The digital predistorter includes a distortion generating unit configured to introduce a nonlinear distortion component of a prescribed order into a digital input signal supplied to the digital predistorter. The distortion generating unit has a multiplier configured to raise the digital input signal to a power consistent with the prescribed order of the nonlinear distortion component, and a finite impulse response filter connected in series with the multiplier. The digital predistorter also includes an adaptive controller configured to receive a reference signal and adaptively adjust the tap coefficient of the finite impulse response filter so as to bring the reference signal to a desired level.

An unbalance identification and vibration suppression control system for a magnetic suspension rotating machinery comprises an unbalance identification module, an unbalanced force compensation module, a magnetic bearing power amplifier, an electromagnet rotor and a displacement sensor. Based on stable control of a magnetic suspension rotor, the unbalance of a magnetic bearing is identified in an online manner by a novel wave trap based on coordinate transformation, on one hand, the identification amount is used for compensating common-frequency current stiffness force, on the other hand, proper common-frequency current stiffness force is generated according to the identification amount to compensate common-frequency displacement stiffness force, and the influence of the low-pass characteristic of the power amplifier on compensation precision of the common-frequency displacement stiffness force is eliminated by leading a simplified inverse model of the magnetic bearing power amplifier into a feed-forward channel. When the magnetic suspension rotor rotates at a high speed, common-frequency bearing force is greatly reduced, and unbalanced vibration of the magnetic suspension rotor is remarkably suppressed. The unbalance identification and vibration suppression control system is simple, convenient, easy and particularly suitable for an actual high-speed magnetic suspension rotor system.

The present invention relates to a device and a method for extracting physiological information from remotely detected electromagnetic radiation emitted or reflected by a subject. A data stream derivable from electromagnetic radiation emitted or reflected by a subject is received. The data stream comprises a sequence of signal samples indicative of desired subject motion and of disturbing motion. The signal samples represent at least one region of interest exhibiting an at least partially periodic indicative motion pattern attributable to at least one physiological parameter, and a non-indicative motion region. The sequence of signal samples is processed, comprising deriving a sequence of derivative motion compensated samples at least partially compensated for undesired overall motion; detecting an evaluation parameter representative of motion compensation accuracy; and deriving at least one characteristic signal at least partially indicative of the at least partially periodic indicative motion pattern from the sequence of motion compensated samples, wherein deriving the characteristic signal is performed depending on the detected evaluation parameter.

The invention discloses a quadrature error closed-loop compensating circuit for a vibrating type silicon micromechanical gyroscope. A gyroscope detection signal enters a synchronous demodulation circuit by diving into two parts after being amplified and filtered: one part of gyroscope detection signal is demodulated through reference signals generated by a phase-locked loop, and after low-pass filtering is performed, an angular velocity signal is obtained; the other part of the gyroscope detection signal is demodulated through the reference signals, which is subjected to phase displacement for 90 degrees, and generated by the phase-locked loop, after low-pass filtering is performed, the voltage amplitude of quadrature error signals in the detection signal is extracted out, and a feedback control voltage is obtained through an integrating circuit; the feedback control voltage passes through a single-double switching circuit and is modulated to the driving frequency through a driving detection capacitance so as to generate a feedback current to compensate quadrature displacement current in the detection shaft direction, and then quadrature error amount in the detection signal is eliminated and finally, the pure angular velocity is obtained. According to the invention, the quadrature error amount in an angular velocity detection loop is eliminated by using the feedback current to compensate the quadrature displacement current in the detection shaft direction of the micromechanical gyroscope, and high-precision closed-loop compensating for the quadrature error of the vibrating type silicon micromechanical gyroscope is achieved.

The invention discloses a display method of a liquid crystal display, a liquid crystal display and a display device. Since the image data of the frame to be displayed can be compensated according to the relationship table between the pre-established gray scale value and the corresponding compensation amount, the image data of the frame to be displayed can be compensated by The grayscale value of the image data is compensated, so that the influence of the coupling voltage between the data line and the common electrode on the display screen of the liquid crystal display can be avoided. Because in the prior art, compensation is performed for the common electrode signal on the common electrode, and the above-mentioned liquid crystal display display method, liquid crystal display and display device provided in the embodiment of the present application compensate the grayscale value of the image, Therefore, compensation can be performed for the gray scale value of each pixel, thereby improving the compensation accuracy.

The invention discloses a mismatch calibration method for a streamline ADC (Analog-to-Digital Converter) multi-bit sub DAC (Digital-to-Analog Converter) capacitor. The mismatch calibration method comprises the following steps of: firstly, initializing a streamline-stage analogue input signal to be calibrated and enabling the outputs of voltage comparators in a sub ADC to be 0 respectively; secondly, measuring an output voltage value of an MDAC (Multiplexing Analog-to-Digital Converter) in the streamline stage; thirdly, setting the output of the ith voltage comparator in the sub ADC to be 1, setting outputs of other voltage comparators to be 0 and then measuring the output voltage value of the MDAC again; fourthly, calculating to obtain a mismatch error value of paired capacitors; fifthly, calculating an output voltage error value of the MDAC in the streamline stage to be calibrated according to the mismatch error value of the paired capacitors; sixthly, connecting a compensation circuit to next streamline stage of the streamline stage to be calibrated in the fifth step and calibrating compensation voltage; and seventhly, compensating the mismatch error of the sub DAC capacitor in the streamline stage to be calibrated according to the obtained compensation voltage. The calibration method can be used for calibrating nonlinear error and simultaneously has higher calibration precision.

The invention provides a current full compensation method and a system based on single-phase earth fault. When zero sequence voltage is not in a preset voltage value range, namely, the happened single-phase earth fault is instant ground connection, an arc extinction coil device with high flexibility in high-resistance ground connection can compensate ground connection capacitive current. When thezero sequence voltage is in the preset voltage value range, namely, the happened single-phase earth fault is not instant ground connection, a breaker in a fault phase transfer ground connection deviceconnected with a fault phase is turned off, fault current is converted into earth current, and a compensable compensation device is further utilized to output full compensation fault residual current. The fault current is converted into the earth current, the earth current can serve as tracking compensation signals of the compensable compensation device, and judgment reference is provided for a compensation effect of the compensable compensation device. In addition, the earth current can be determined by measurement; furthermore, measurement is convenient, and complex calculation is avoided;thus, compensation quickness and accuracy are ensured, compensation precision is improved, and fault points are shielded.

A grid-connected inverter grid-connection point voltage dynamic compensation control method, namely, a dynamic voltage amplitude wattless current IQ (U) voltage compensation control method is provided. When the voltage of a grid-connection point of a grid-connected inverter rises and exceeds the limitation on voltage deviation posed by power grid standards, the grid-connected inverter is controlled and is made to absorb a certain wattless power, such that the voltage of the grid-connection point can be restored to be in a voltage deviation range; and when the voltage of the grid-connection point voltage drops, the grid-connected inverter is controlled and is made to generate a certain wattless power, such that the voltage of the grid-connection point can be restored to be in a normal voltage range.

The invention discloses a method for locating Mark points on a PCB (printed circuit board) by utilizing an outline gravity center method. The method is characterized by comprising the following steps: on the basis of taking a Mark point extracted in initial programming as a datum point, taking the outline gravity center of the Mark point of the board to be detected, comparing the outline gravity center of the Mark point with the gravity center of the datum point, and performing PCB compensation by virtue of offset between the two gravity centers. The method is used for performing the PCB compensation by extracting the outline gravity center of the Mark point on the PCB and utilizing the offset between the gravity centers of the datum Mark point and the Mark point to be detected. The gravity centers are obtained by binary images and are easy and feasible to obtain. The algorithm is independent from the shapes of the Mark points, is not influenced by the intensity of illumination, achieves sub-pixel-level precision, and is high in compensation precision.

The invention discloses a ground fault current compensation system and method for a self-produced power supply phase power supply. The system comprises a phase power supply generator, a phase power supply phase compensator, a fling-cut switch, a controller and a voltage transformation device. An output end of a phase compensator of a power supply is connected to a system neutral point through thefling-cut switch. The system can passively generate power distribution network power supply phase power supply and harmonic phase power supply and input anti-phase power supply phase power supply andthe harmonic phase power supply into the system according to fault logic. The complete compensation of power distribution network grounding fault reactive current, harmonic current and active currentis achieved, the defect that compensation is incomplete by adopting a power electronic device inversion injection method after electricity is taken from a bus system is overcome, and the problems thatan active inversion method has a poor metallic grounding compensation effect and a traditional arc suppression coil cannot achieve full compensation are solved. The system is efficient and accurate and can completely compensate overvoltage and overcurrent generated by a grounding fault, the safety of a power grid and equipment is guaranteed, and the risk of electric shock of a human body is completely avoided.

The invention discloses a method for friction compensation of a ball screw feeding system. On the basis that the actual friction phenomenon of the system is analyzed, segmented models of friction torque in speed sections are provided, friction in the low-speed section is modeled through a Steck Berry model, and friction in the high-speed section is modeled through a logarithmic model. Unknown parameters of the friction models are recognized through a hybrid genetic algorithm, the friction compensation amount at the real-time speed is estimated based on the recognized friction models, and friction compensation of the system is achieved in a compensation amount feedforward mode. Through the segmented friction model, friction in the ball screw feeding system is accurately described, the parameters of the friction models are accurately recognized through the designed hybrid genetic algorithm, motion accuracy of the ball screw feeding system is improved based on the feedforward compensation mode of the friction models, and the method can be widely applied to various systems which comprise ball screw feeding mechanisms.

The invention discloses a device and method for positioning a workpiece on a linear conveyor belt through a visual system. The workpiece is placed in a photographing area to be fixed. A visual system photographs and records the position information of the workpiece in the photographing area, the linear conveyor belt conducts linear conveying on the workpiece from the upstream direction to the downstream direction, and the conveyor belt is stopped after conducting conveying for a distance. A pulse encoder detects linear distance data which are generated after the linear conveyor belt moves and transmits the data to a robot. The robot analyzes the data and works out the needed compensation amount for a work track, accurate positioning is achieved, and finally the robot acts on the workpiece. By means of the device and method for positioning the workpiece on the linear conveyor belt through the visual system, far-end visual positioning is used for near-end work track compensation, and compared with a dynamic linear tracking technology, compensation precision is high, and in addition the speed of the conveyor belt can be higher.

The invention discloses a gray-scale value compensation method and system for a display panel, and the display panel. The method comprises the steps: obtaining an image of at least one gray scale of the display panel, and obtaining the gray-scale value compensation values of a plurality of pixels on the display panel and the corresponding position data of the pixels; judging whether the whether there is one or more pixel groups which consist of pixels with the same gray-scale compensation value, or whether there is one or more pixel groups which consist of pixels with the same gray-scale compensation value and the pixels with the gray-scale compensation value difference with the pixels with the same gray-scale compensation value being within a first threshold range: recording at least one gray-scale compensation value of each pixel group and the corresponding position data of each pixel in the pixel groups if there is one or more pixel groups above, so as to achieve the compensation for the display panel. The method can effectively improve the brightness uniformity of the display panel in the above mode.

An apparatus includes a positioning system and a patient reference sensor (PRS). The positioning system acquires a plurality of raw PRS readings over time, which can indicate the position and orientation of the PRS. A filter is configured to process the raw PRS readings and output filtered PRS readings. The filter outputs filtered PRS readings as a baseline value while the raw PRS readings stay within a predetermined range and output filtered PRS readings as unchanged raw PRS readings when the raw PRS readings reach or vary outside of the predetermined range. A motion compensation function generated based on at least the filtered PRS readings can be used to correct a subject position and orientation (P&O) to compensate for the motion of the moving region of interest over time.

The invention discloses a method capable of automatically eliminating a motion accumulated error of a robot. The problems that the robot is required to be stopped working in the process of eliminating an operating error of the robot, the processing continuity is blocked and the high efficiency and accuracy during the processing and production of the robot are reduced in the prior art are solved. The method comprises the following steps of: (1) obtaining an actual position relationship of joints of the robot and actual information of an actual rotating angle through a visual detection algorithm; (2) obtaining a theoretical position relationship of joints of the robot and theoretical rotating angle information through a path planning algorithm by taking the original motion path as reference; (3) comparing the actual information obtained in the step (1) with the theoretical information obtained in the step (2) to obtain an accumulated error value of the robot; and (4) automatically loading the accumulated error value into a motion control program, and performing position compensation on each joint according to the accumulated error value so as to finish online zero calibration.

The invention relates to an inverse synthetic aperture radar imaging signal processing technology, in particular to a sparse aperture ISAR imaging phase self-focusing method based on image quality guidance. The method comprises the following steps of: S1, constructing a sparse aperture phase self-focusing model based on compressed sensing; S2, selecting a target distance unit that participates inphase estimation parameter estimation; S3, setting an initial parameter value of an iterative algorithm; S4, estimating and compensating a single wheel phase error; S5, determining an iteration termination condition; and S6, updating the phase self-focusing, and reconstructing an ISAR image. According to the sparse aperture ISAR imaging phase self-focusing method based on the image quality guidance, the ISAR imaging phase self-focusing, the ISAR image reconstruction, and the image quality evaluation under the sparse aperture are combined, and four steps of phase error estimation, compensation,reconstruction, and evaluation are realized, the robustness of the algorithm and the accuracy of the phase compensation are improved , and a target ISAR image with higher compensation accuracy and better focusing performance is obtained by reducing the iterative phase error, estimating offset, improving compensation accuracy step by step.

The invention discloses a grounding fault current compensation system and method for a self-generated power supply phase power supply. The grounding fault current compensation system comprises a phasepower supply converter, a fling-cut switch, a voltage transformation device and a controller, wherein the input end of the phase power supply converter is connected with a bus, the output end of thephase power supply converter is connected with the input end of the fling-cut switch, the voltage transformation device is connected between the phase power supply converter and a system neutral pointin series, the controller is connected with a voltage transformer of the bus, and the output end of the controller is connected with the input end of the fling-cut switch. The system can passively generate a power distribution network power supply phase power supply and a harmonic phase power supply, and the reversed-phase power supply phase power supply and the harmonic phase power supply are put into the system according to fault logic, so that complete compensation of reactive current and harmonic current of the grounding fault of the power distribution network is achieved, the defect thatthe compensation is incomplete by adopting a power electronic device inversion injection method after electricity is taken from a bus system is overcome, and the problems that an active inversion method is poor in metallic grounding compensation effect and a traditional arc suppression coil cannot achieve full compensation are solved.