227results about How to "Quick compensation" patented technology

A slump retaining polycarboxylic acid superplasticizer. A weight average molecular weight of the superplasticizer is 20,000-80,000. The slump retaining polycarboxylic acid superplasticizer is prepared by performing polymerization reaction on a monomer A, a monomer B, a monomer C and a monomer D in an aqueous solution in the presence of a redox initiator, wherein a molar ratio of (the monomer A+the monomer B):the monomer C:the monomer D is 1:(3-8):(4-12), and a molar ratio of the monomer A to the monomer B is 1:(1-4).

A feed-forward correction circuit in a PWM controller adjusts an error signal inversely with respect to a supply voltage for a switching voltage regulator to quickly compensate for changes or transients in the supply voltage. The adjusted error signal is provided to a PWM comparator to control a duty cycle of an output signal. The switching voltage regulator can be a DC-to-DC converter or a DC-to-AC converter, and the output signal is used to generate one or more driving signals to control semiconductor switches in the switching voltage regulator. The feed-forward correction circuit uses an offset compensation technique or a translinear circuit to maintain a substantially inverse product relationship between the supply voltage and the duty cycle of the output signal, thereby reducing overshoots and undershoots in a regulated output voltage of the switching voltage regulator.

A voltage regulator includes an undervoltage detector having a charge transistor smaller than an output transistor of the voltage regulator, providing a detection path for fast response, compensating undervoltage without large control current when loading changes from light to heavy.

Embodiments of the present invention provide a system and method for continuous flow production of mixed fluids. The mixed fluids can comprise a mixture of different fluids or a mixture of the same fluid having different input properties such as temperature. In general, two streams of fluid of varying temperature are supplied to a mixer. The flow rate of each of the input fluids can be regulated to produce a mixed fluid at a desired flow rate and temperature. As an example, mass flow controllers can regulate the flow rates of a hot and cold stream of de-ionized water to produce a stream of de-ionized water at a desired flow rate and temperature.

In a method and a device for setting the focal spot position of an X-ray tube the focal spot position is regulated as a controlled variable by a closed loop regulation circuit. A deflector deflects the electron beam of the X-ray tube depending on a deflection signal, a deflection closed loop regulator generates the deflection signal depending on a focal spot position signal. A measurement arrangement measures a focal spot position signal. The deflector, the deflection closed loop regulator and the measurement arrangement form a closed loop regulation circuit with the focal spot position as the controlled variable and with the deflection signal as the control parameter.

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.

In an imaging apparatus such as a digital still camera, a scene is judged with using an image data outputted from an area sensor in a preparation state in which an image displayed on a monitor display serves as a viewfinder, and another image data to be recorded in a recording medium in an image recording mode is compensated corresponding to a result of judgment of the scene. By such the compensation, an image using the image data recorded in the recording medium can properly be reproduced by an image outputting apparatus such as a printer.

The invention is an enossal implant with a coating that accelerates the healing-in process and counteracts demineralization of the bone when the cavities that are necessary for insertion of the implant are made. The invention elevates the osmotic pressure in the immediate vicinity of a freshly inserted implant so as to compensate quickly for the loss of salts and minerals of the chemical compounds and minerals contained in the bone and the bone fluid when the cavity is made. The surface of the implant may be, for example, coated with a dry crust of soluble NaCl crystals, which dissolves gradually after the insertion.

A system for controlling the excitation of an alternator field coil. The system comprises a capacitor forming a charge reservoir, a first and a second selectively operable switch connected to opposing ends of a field coil of the alternator, a first catch diode, and a second catch diode. At least one of the first and second switches are operated at a variable duty cycle and the capacitor both absorbs energy from the field coil and supplies energy to the field coil to regulate the magnetic field of the field coil, effective to regulate the output voltage of the alternator and rapidly compensate for changes in at least one load connected to the alternator.

The invention provides a camera anti-shake structure and belongs to the technical field of machinery. The structure solves the serious problem of shake of two axes of the existing camera. According tothe camera anti-shake structure, a camera comprises a framework and a limiting frame; the limiting frame is arranged in the framework; a prism and a lens are arranged in the limiting frame; a focusing magnet is arranged in the framework; an outer cover is arranged on the framework in a covering manner; the anti-shake structure comprises an anti-shake coil I arranged on a circuit board, an anti-shake coil II arranged on the outer cover, an anti-shake magnet I arranged in the framework and an anti-shake magnet II arranged on a side wall of the limiting frame; the anti-shake coil I and the anti-shake magnet I are arranged oppositely; the anti-shake coil II and the anti-shake magnet II are arranged oppositely; and length directions of the anti-shake coil I and the anti-shake coil II are perpendicular to a length direction of the focusing coil. The anti-shake magnet II and the anti-shake coil II of the structure can vertically compensate a deviation of camera shake in a shooting process ofa person, and the anti-shake adjustment of the two axes of the camera is achieved.

The invention provides a quick dynamic reactive-power compensating method of combined electrical load. The method is characterized in that a power electronic power converter (12) is controlled by an intelligent controller (7) to change the current and the impedance of a secondary winding of a variable reactor (11), so as to change the current and the impedance of a primary winding of the variable reactor (11); the fundamental current is changed by changing the admittance of the variable reactor when the input voltage is unchanged, so that the change of the variable reactor absorbing reactive power is caused; when an adjustable capacitor bank (5) is controlled by the intelligent controller and the target power factor is compensated, an inductive reactance convertor (6) can slide to adjust the reactive power in cooperation with the adjustable capacitor bank; therefore, the dynamic reactive-power compensation of the combined electrical load is realized. The method can realize real-time analysis and extraction of reactive power and reactive current under different load conditions, so as to realize intelligent control of the optimal quick reactive-power compensation; and the method can be used for quick reactive-power compensation of the combined high-voltage electrical load in the industries such as metallurgy, building materials, petrifaction and the like.

The invention provides a voltage drop compensation method, a voltage drop compensation device and a display device. The voltage drop compensation method includes the following steps that: voltage drop of power source signals corresponding to a sub pixel set is determined; a first equivalent brightness drop value corresponding to the voltage drop is determined; the initial brightness value of each sub pixel in the sub pixel set is calculated; the target brightness of each sub pixel in the sub pixel set is calculated, wherein the target brightness of each sub pixel in the sub pixel set is the sum value of the first equivalent brightness drop value corresponding to the sub pixel set and the initial brightness value; and the driving signals of each sub pixel are generated according to the target brightness of each sub pixel in the sub pixel set, and are outputted. With the voltage drop compensation method, the voltage drop compensation device and the display device of the invention adopted, the calculation amount of voltage drop compensation can be reduced, and accurate and fast voltage drop compensation can be realized.

The invention discloses a hybrid compensation circuit and method for OLED pixel, by using a pixel internal driver circuit (100) of 4T1C structure to compensate threshold voltage of driving TFT using the source follow approach to achieve fast compensation; and in driving light-emitting phase, using an external compensation circuit (200) to detect the current flowing through the OLED (D1), comparing, computing and storing the difference between the current flowing through the OLED (D1) and a pre-defined current; when the corresponding row of pixel internal driver circuits (100) entering the threshold voltage programming design phase again, performing compensation on the data signal (Data), correcting compensation result so that the current flowing through the OLED (D1) is closer to the pre-defined current to achieve large compensation range.

ABSTRACT Frames are divided into a plurality of sections on the basis of input images of the frames (S8). One representative image that represents the image of each frame is set in each of the sections (S10). One representative image to be referred to is selected so as to encode an image of a frame of interest from the representative images set for respective sections, and the image of the frame of interest is encoded by motion compensation using the images of the frames in the section that includes the selected representative image (S13, S14, S15).

A gain compensation technique for a fractional-N phase lock loop includes locking a reference signal with the N divider feedback signal in a phase lock loop including a phase detector, charge pump, loop filter and voltage control oscillator with an N divider in its feedback loop; driving the N divider with a sigma delta modulator including at least one integrator to obtain a predetermined fractional-N feedback signal; and commanding a scaling in phase lock loop gain by a predetermined factor and synchronously inversely scaling by that factor the contents of at least one of the integrators.