99results about How to "Avoid overcompensation" patented technology

A system and method process non-linear image data, still or video, from a digital imager. Noise generated by analog-to-digital converters is filtered from a pixel of digital image data. Moreover, the effects of single pixel defects in the imager are eliminated by clamping a predetermined pixel of image data within the window when the value of the predetermined pixel is greater than a maximum value of the image data of neighboring pixels or less than a minimum value of the image data of neighboring pixels. Ripples in image data are reduced by eliminating the effects of single pixel defects before filtering for crosstalk caused by electrical crosstalk between sensor elements in an imager. Dark current is removed from image data generated by an imager by subtracting a fraction of a determined dark current value from all image data generated by the imager to compensate for nonlinearities in dark current across the imager. The image data is white balanced by creating a set of scalar color adjustments from determined average color values and constraining the set of scalar adjustments to plausible lighting conditions to prevent overcompensation on images having large regions of similar hue. Lastly, utilization of a fixed set of intensity levels is optimized by remapping and restreching the image data to create new luma values for each pixel.

The invention is a method and a device for measuring and compensating transmission error of electric cylinders; a control computer transmits position commands to a position controller for signal conversion via software, and a servo driver drives an alternating current servo motor to rotate so as to drive an ejector rod of the electric cylinder to have a straight line motion; an encoder outputs feedback signals to the position controller, and the position commands are compared with the feedback signals output by the encoder; when the ejector rod of the electric cylinder has a straight line motion, a digital display magnetoscale measures the travel route; a strain gauge force sensor is used for detecting the load supported by the ejector rod of the electric cylinder, and the load value is converted into analog voltage signals that are input to an A/C interface card; the A/C interface card converts the analog voltage signals to digital signals which are input to the control computer. To give full consideration to influence factors of transmission error in inverting and oscillating load when the electric cylinder moves, when the control computer compensates transmission error, over compensation or undercompensation of the electric cylinder is avoided, thereby improving the control precision of electric cylinders.

A method for compensating failed printing nozzles in inkjet printing machines using a control computer, includes printing a test form for a material combination, evaluating the print and creating a look-up table having compensation probabilities for local surface density, detecting a failed nozzle, reading the size of the intended droplet to be compensated at the failed nozzle, calculating local surface density at the failed nozzle, reading a compensation probability from the table with the calculated local surface density, calculating a pseudo-random number for adjacent pixels right and left of the pixel to be compensated, increasing the droplet size for adjacent pixels if the pseudo-random number therefor is lower than the compensation probability from the table, calculating adjacent droplet sizes for all intended droplets at the failed nozzle and using the changed droplet sizes in printing data. The print job is carried out with changed printing data.

An organic light emitting diode display device is disclosed which adjusts brightnesses and color temperatures of RGBW data signals and matches the brightnesses of organic light emitting diodes and the color temperature of a white organic light emitting diode with the target brightness value and the target color temperature of a white pixel. As such, an overcompensation and the reduction of a lifespan can be prevented. Also, relatively high brightness and color temperature can be maintained.

An electric power steering control apparatus can reduce steering torque even in a steering holding state or a slight steering state without providing an unpleasant feeling to a driver. The apparatus includes a torque sensor for detecting steering torque generated by the driver for a vehicle, a motor for generating assist torque to assist the steering torque, a rotational speed detector for detecting the rotational speed of the motor, a torque controller for calculating an assist torque current corresponding to the assist torque based on the steering torque, and a damping control section for calculating a damping current to be added to the assist torque current to suppress vibrations generated in a steering system of the vehicle. The damping controller reduces a damping control gain to calculate the damping current when the rotational speed of the motor is equal to or less than a predetermined speed.

The invention relates to a parallel operation system for reactive power compensation devices and a reactive power compensation control method. Two transformers run in parallel; buses corresponding tothe transformers are connected with the reactive power compensation devices; the buses are connected through a bus tie breaker; and the adopted reactive power compensation control method comprises thesteps of adopting one reactive power compensation device as a host and the other reactive power compensation devices as slaves; and detecting current and reactive power on all buses by the host and determining to-be-compensated reactive current of the host and the slaves according to the operation modes of all reactive power compensation devices. Compared with a single SVG, the system has the advantage that the capacity of the system is increased; and due to parallel arrangement of the transformers, two SVGs are divided into the host and the slave and communicate with each other, and reactivepower compensation current is distributed between the host and the slave.

The invention discloses a voltage optimizing point sorting method for a 10KV overhead line reactive compensation device. The method comprises the following steps: a. obtaining the load rate and the power factor in maximum load according to data of line load curves and reactive and active sampling; b. initially determining the compensation capacity range; c. calculating and drawing a line load and impedance distribution diagram according to the load rate, the power factor and a circuit electric wiring diagram as well as the span and the diameter of an overhead line, and counting the reaction value of a main circuit or branches; d. calculating the voltage drop percentage of each load point relative to an original point or a branch point; e. determining compensation point quantity and capacity according to the conditions of line voltage drop and line reactive capacity in an allowable compensation range, and verifying; and f. determining the position of the compensation point. By adopting the method, the quantity and position of the compensation points can be analyzed and calculated according to actual conditions, the compensation efficiency to the lines can be improved maximally, and meanwhile, the conditions of overcompensation and under-compensation can be avoided.

The invention discloses a device and a method for switching a stepped capacitor group. By the device and the method, the electric energy quality can be monitored in real time and can be subjected to reactive switching control, meanwhile the device has a fault diagnosis function on the capacitor group and a switching switch, and the reliability of a system is increased. The device consists of an electric energy parameter reading single chip system, a switching control single chip system, a fault diagnosis single chip system and a coordinate control single chip system, wherein the electric parameter reading single chip system consists of a first voltage mutual inductor, a first current mutual inductor, an electric energy metering module, a grid fault state indicating system, a grid fault sound-light alarm system and an electric energy parameter reading single chip; and the fault diagnosis single chip system consists of a second voltage mutual inductor, a second current mutual inductor, a fault diagnosis single chip, auxiliary contacts of the switching switch, a capacitor group fault state indicating system and a capacitor group fault sound-light alarm system. The four single chips form a sub-system with host machine-client machine relation, can finish respective task independently and can also work cooperatively.

The invention relates to a method and system for suppressing torque ripple of a brushless DC motor. The method comprises the steps: acquiring Hall signals collected by a Hall sensor in the brushless DC motor and a three-phase phase current in the operation process of the brushless DC motor, judging whether the brushless DC motor is in a phase change state or not according to the Hall signals and the three-phase phase current: if not, controlling a voltage type inverter in a two-two conduction control mode, or else controlling the voltage type inverter in a two-two conduction and three-three conduction switching control mode. At the commutation stage, only one switching tube is changed through the two-two conduction and three-three conduction switching control mode, and the torque ripple generated by the brushless DC motor in commutation is effectively restrained. Due to the fact that the two-two conduction control mode and the three-three conduction control mode are matched with each other, a dead zone does not need to be set, the suppressing effect of torque ripples is better, the detection method and the control algorithm are simpler, the calculation difficulty is lower, the costis lower, and the control efficiency is higher.

An electric power steering device including: a control rotational displacement calculation unit configured to calculate a control rotational displacement when a steering angle of the steering system is in an angular range from a maximum allowable steering angle for the steering system to a predetermined threshold steering angle; a control steering angle shifting unit configured to calculate the control rotational displacement corrected by a correction amount based on one of the steering torque and rack axial force and a sign of one of the control rotational displacement and the steering angle as a shift control steering angle; and a feedforward control unit configured to output a second current command value based on the shift control steering angle and steering velocity. An assist control is controlled with a third current command value calculated by adding the second current command value to the first current command value.

The invention relates to a low-power full-intelligent in-situ reactive power compensation device which comprises a micro-controller unit, a current zero-crossing detection unit, a voltage zero-crossing detection unit, a compensation capacitor switching interface unit and three groups of compensation capacitors, wherein the voltage zero-crossing detection unit is used for carrying out detection on a voltage zero point via a voltage transformer, the current zero-crossing detection unit is used for carrying out detection on a current zero point via a current transformer, zero-crossing signals of voltage and current are connected into a port of the micro-controller unit, the phase difference between the current and the voltage is obtained through the comparison and the calculation in the micro-controller for measuring a power factor, and the compensation capacitors are connected into two ends of a load at the time that the voltage crosses the zero point according to the phase difference between the current and the voltage. The product can be embedded into an electric energy meter or an inductive household electrical appliance as a component part of the electric energy meter or the inductive household electrical appliance, thereby carrying out in-situ reactive compensation on the electrical appliance and achieving the best energy-saving effect.

The invention discloses a shield gate MOSFET device with a uniformly doped channel and a processing technology, which are characterized in that on the basis of the existing shield gate MOSFET device,a heavily doped first conductive type polycrystalline silicon column region is formed in a groove etching heavily doped polycrystalline silicon filling mode, and then a first conductive type body region is formed in a rapid thermal annealing mode; by optimizing the doping concentration of the first conductive type body region, a mutation junction is formed between the first conductive type body region and the drift region, so that the threshold consistency of the device is improved, meanwhile, the problem that the first conductive type body region is excessively compensated by the drift regionis solved, the doping concentration of the body region is improved, and the possibility that a parasitic triode of the device is turned on is reduced; reliability of the device is improved.

The invention discloses a low-voltage distribution network line reactive compensation device, comprising a compensation unit connected in parallel in a low-voltage line in a low-voltage distribution network and a control unit controlling the switching of the compensation unit. The compensation unit comprises phase selection switches and capacitors which are sequentially connected in the low-voltage line. The control unit comprises a wireless communication circuit used for receiving low-voltage distribution network reactive power daily load curve data transmitted from an upper computer; an FPGA central processing circuit used for processing the curve data and transmitting a time switching signal; a storage used for storing the curve data; and a drive circuit used for controlling the switching of the phase selection switches based on the switching signal. A reactive compensation method of the invention comprises the following steps of 1) transmitting the time switching signal and calculating time reactive power needing compensation; 2) transmitting a comparison switching signal and calculating comparison reactive power needing compensation; 3) transmitting a request switching signal and request reactive power; 4) selecting and executing one switching signal; and 5) selecting the number of devoted capacitors.

The invention discloses a pump control system main valve hysteresis compensation method and device, and the method comprises the following steps of collecting the valve front pressure P1 and the valverear pressure P2 of a main valve, and calculating to obtain a pressure difference P3 = P1-P2; comparing the pressure difference P3 with the preset pressure preset values K1 and K2, wherein K2 is greater than K1; A) not carrying out the hysteresis compensation when K1 <=P3<=K2; B) carrying out the hysteresis compensation when P3<K1, and stopping the hysteresis compensation until P3>K1; C) when P3>K2, considering that the hysteresis compensation is excessive, and correcting the compensation. The method of the present invention can compensate the hysteresis of the main valve, and prevents the excessive compensation.

The invention relates to a method for compensating for defective printing nozzles (11) in an inkjet printing machine (7) by way of a computer (6,19). Defective printing nozzles are compensated for byan increased ink drop volume of neighboring printing nozzles (11) and the real positions of the print dots of all printing nozzles (11) are determined and, to compensate for a printing nozzle failure,the required ink drop volumes of the respective neighboring printing nozzles (13,14) are calculated for every printing nozzle as a function of the real positions of the print dots of the respective neighboring printing nozzles. In addition to increased ink drop volumes of the respective neighboring printing nozzles (13), reduced ink drop volumes are calculated for the respective next but one printing nozzles (14) and all ink drop volumes are calculated based on the print dots of the respective printing nozzles.

The invention discloses a novel slope compensation circuit. The novel slope compensation circuit comprises a slope signal generation circuit and an upper tube current sampling circuit. The slope signal generation circuit is connected with the upper tube current sampling circuit. According to the slope signal generation circuit, a source follower structure is adopted to ensure that slope current and input voltage form a linear relationship; and an output current mirror image point potential isolation structure is adopted, so that a mirror point potential is prevented from being interfered during switch conversion. An operational amplifier circuit of the upper tube current sampling circuit adopts a BIP transistor, so that the current detection precision is improved. According to the novel slope compensation circuit of the invention, the current flowing through a sampling upper tube is superposed to a slope signal to realize slope compensation, so that the stability of a system is improved and the response time of the system is reduced; the slope generation circuit adopts the source follower structure, so that the circuit structure is simplified, and the accuracy of the slope signal is improved; and triodes with larger areas are adopted as input geminate transistors of the upper transistor current sampling circuit, so that the offset voltage is reduced, and the current compensation precision is improved.

The invention discloses a reactor switching module. The reactor switching module comprises a reactor, a small resistor, three controllable switches and a controllable switch driving circuit, wherein the reactor is connected in parallel with the small resistor, a first end of the reactor is connected with a zero line LN of a three-phase four-wire system distribution network circuit, a second end of the reactor is connected with phase lines LA, LB and LC of the three-phase four-wire system distribution network circuit separately through the three controllable switches, two input ends of the controllable switch driving circuit are connected with an external master control circuit, and three output ends of the controllable switch driving circuit are connected with control ends of the three controllable switches separately. With the reactor switching module disclosed by the invention, time-division and phase-division compensation on three-phase sensing reactive power can be achieved; the problem of excessive compensation generated by purely employing a capacitor as a reactive power compensation device can be avoided when the reactor switching module and a capacitance compensation module are jointly used; the module is connected in parallel with the small resistor in a reactor branch, voltage impact and voltage oscillation generated during the switching process of the reactor can be reduced; and the module adopts the controllable switches to switch the reactor, the switching time point of the reactor can be accurately controlled, surge current generation is prevented, and thus, the switching process of the whole module is safe and reliable.

The invention discloses an efficient control device for a power factor of a diesel generator set, and belongs to the field of generators. The existing system is poor in operability, prone to make errors, poor in accuracy and low in response speed. The device is characterized in that one end of a voltage and current sampling and amplitude conversion unit is sequentially connected with a rectifyingcircuit unit, a capacitor filtering unit, a resistor gear setting unit, a hysteresis comparison unit, a capacitor switching unit and a capacitor bank unit; the output end of the capacitor bank unit isconnected the power output end of a diesel generator set unit and then connected with the other end of the voltage and current sampling and amplitude conversion unit. According to the invention, theadjustment range of the power factor of the diesel generator set can be expanded, over-compensation or under-compensation can also be avoided, the system is enabled to be simple in structure, lower incost and higher in reliability, and errors and time delay can also be reduced.

The invention discloses a display compensation method and device of a display panel, a display device and a medium. The method comprises the following steps: acquiring a reference compensation parameter corresponding to each gray binding point of the display panel at a reference refresh rate, and an offset coefficient of a target refresh rate relative to the reference refresh rate; and when the display panel displays at the target refresh rate, compensating a displayed picture according to a product of the offset coefficient and the reference compensation parameter. According to the embodiment of the invention, the problem of insufficient compensation or excessive compensation at certain refresh rates can be solved.

The invention relates to a flame ionization detector. The flame ionization detector has a combustion chamber with an electrode arrangement for measuring an electric current from a gas flame to an electrode of the electrode arrangement, a burner nozzle having at least one output-side outlet for ejecting a gas mixture to be ignited between the electrode arrangement and having at least one input-side inlet for feeding a hydrogen-containing combustible gas and a carbon-containing gaseous analyte through a transport channel to the outlet, and a feeder for feeding oxygen-containing combustion air into the combustion chamber, wherein at least one cut-out is provided in the burner nozzle, through which cut-out combustion air can pass from the combustion chamber into the gas mixture flowing out of the outlet. The invention also comprises a corresponding vehicle, a power station, and a corresponding burner nozzle.