30results about How to "Reduce high frequency components" patented technology

The CFG is mixed with BFG by providing different delayed time when it is supplied into air reservoir (2), and thus the fluctuation ratio of CFG calorie is inhibited. The air current rate of BFG is controlled by feedback control according to gas calorie of mixed gas, and so the gas calorie of mixed gas is controlled.

The invention relates to a high resolution satellite attitude fluttering detection method based on intensive control points, comprising the following steps of: 1, pre-processing a reference image; 2, intensively matching the pre-processed reference image with a satellite image obtained in real time; 3, resolving the satellite attitude fluttering. Compared with the prior art, the high resolution satellite attitude fluttering detection method can accurately detect the attitude fluttering phenomenon of the satellite platform by using the support of external reference data (DOM (Digital Orthoimage) and DEM (Digital Elevation Model)), and thereby restoring the actual state of the satellite on-orbit motion, and has the advantages of being high in accuracy and detection precision.

The invention discloses a de-interleaving method for correcting motion compensation by using errors and a device for realizing the method. The method steps of the present invention include detecting the difference between the original pixel and its corresponding motion compensation pixel in a spatial neighborhood of the pixel to be interpolated; using the difference to estimate the motion compensation error; using the estimated error to correct the motion compensate. The device for performing the method includes: an error detector for detecting the difference between several original pixels and their corresponding motion-compensated pixels; Modified compensator for motion compensation. The invention has less calculation amount, lower implementation cost, and greatly improves the effect of motion compensation.

The invention relates to a coordinating and smoothing control method for a wind turbine generator and an energy storing device and belongs to the technical field of safe and economical operation and control of a grid-connected wind power field. The method comprises the following steps: calculating the low-pass filtering cut-off frequency of the wind turbine generator, performing low-pass filtering on the output power of the wind turbine generator, calculating the high-pass filtering cut-off frequency of the energy storing device, performing high-pass filtering on power instruct of the energy storing device by adopting the cut-off frequency, outputting active power for power compensation of the wind turbine generator, and restraining the high frequency part of the output power of the wind turbine generator by the active power. The method not only is free of relatively largely modifying on a control strategy of the wind turbine generator, convenient in practical application, relatively slight in influence on the wind turbine generator stability and the wind energy utilization rate and capable of simultaneously effectively reducing the capacity and cost of the energy storing device, prolonging the service life of the energy storing device, and has a relatively good economic benefit.

A continuous time integrating triangular analog-to-digital converter includes a first integral for integrating the difference between a first differential signal derived from the differential analog input signal and a second differential signal derived from the quantized output signal. stage, a quantizer, and a low-pass filter. The first integrator stage has a differential operational amplifier, first, second, third and fourth input resistors and a first pair of integrating capacitors. The differential analog input signal is received at the first and second input nodes of the converter, and the first and third input resistors are connected in series between the first input node and the first input terminal of the operational amplifier. The second and fourth input resistors are connected in series between the second input node and the second input terminal of the operational amplifier. The first and second input resistors are respectively connected in series with the third and fourth input resistors.

The application provides a driving method and system of a voice coil motor, a camera module and a mobile phone. The controller receives configuration parameters through a communication interface, and generates control commands according to the configuration parameters. The waveform generation unit can then receive and generate a sinusoidal current waveform in response to the control command. The digital-to-analog converter receives and converts the sinusoidal current waveform in response to the control command, obtains a driving current corresponding to the sinusoidal current waveform, and outputs the driving current to drive the voice coil motor. In this way, by using the sine wave current waveform to output the corresponding driving current, thereby reducing the high-frequency component in the current waveform, the overshoot value of the VCM can be effectively reduced, and therefore, the serious overshoot phenomenon in the prior art when driving the VCM can be solved. , leading to the problem of long VCM harmonic oscillation time.

The invention discloses an isolated voltage compensation circuit, comprising a primary side circuit and a secondary side circuit, wherein the primary side circuit comprises four power switching tubes with antiparallel diodes and two clamping capacitors only; a secondary output voltage is directly coupled to enter into a power grid by an isolation transformer so as to compensate a power grid voltage; in the isolated voltage compensation circuit, combination of every two power switching tubes can be realized by an IGBT (insulated gate bipolar transistor) half bridge module; the two clamping capacitors are utilized to clamp voltage spikes on the power switching tubes; and a built-in LC filter is used to reduce the high-frequency ripple component of the transformer. For the isolated voltage compensation circuit, a traditional PWM (pulse width modulation) method is applied, parts of power is utilized to convert, and a high-capacity DC (direct current) energy-storing link does not exist, thus the isolated voltage compensation circuit can compensate a harmonic voltage output by a diesel engine generator and solves the problems of voltage sag, voltage surge, continuous low voltage and other electric energy quality problems.

The invention provides a driving device matched with an electrode in a capacitive touch system. The driving device comprises a signal generation module and an adjustment module, wherein the signal generation module is used for generating a driving signal; the adjustment module is connected between the electrode and the signal generation module, and is used for generating a post-adjustment signal according to the driving signal to replace the driving signal and controlling the waveform of the ascending edge or the descending edge of the post-adjustment signal to guarantee that fewer high-frequency components are in the post-adjustment signal relative to the driving signal.

An exhaust pipe into which an exhaust gas from a single cylinder engine flows is provided with a three way catalyst. The exhaust pipe includes a first pipe inserted into a muffler and a second pipe extending toward the downstream side from the first pipe within the muffler. A narrowed portion having an inner diameter smaller than that of a cylindrical portion of the first pipe is provided in a downstream-end opening of the first pipe. The narrowed portion is inserted into an upstream-end opening of the second pipe. A first expansion chamber that integrally encloses the outer periphery and thedownstream-end opening of the second pipe is formed within the muffler. A plurality of holes are formed in a distributed manner in a region, except a downstream region, of a peripheral surface of thesecond pipe. The length in the axial direction of the downstream region is not less than 1 / 3 times the inner diameter of the second pipe.

The invention discloses a phase-locked loop circuit. The circuit comprises a phase discriminator, a low-pass filter and a voltage-controlled oscillator, wherein an external reference clock is input to one input end of the phase discriminator; the output end of the phase discriminator is connected with the input end of the low-pass filter; the output end of the low-pass filter is connected with the input end of the voltage-controlled oscillator; and the output end of the voltage-controlled oscillator is connected with the other input end of the phase discriminator. The circuit further comprises an access selector, a voltage / pulse width converter, a pulse width / voltage converter and a local oscillator, wherein the input end of the access selector is connected with the output end of the phase discriminator; the output end of the access selector is optionally connected with the input end of the low-pass filter or the input end of the pulse width / voltage converter; the output end of the pulse width / voltage converter is connected with the input end of the voltage / pulse width converter; and the output end of the voltage / pulse width converter is connected with the input end of the low-pass filter. According to the phase-locked loop circuit, high-frequency components of a control signal at the input end of the voltage-controlled oscillator are reduced, reference spurs of an output signal of the phase-locked loop circuit are reduced, and the frequency of the output signal is more stable and reliable.