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30results about How to "Reduce high frequency components" patented technology
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'V' type builti-in rotor of permanent megnet dynamo
InactiveCN1835340AIncrease the maximum safe operating speedReduce weightMagnetic circuit rotating partsStress pointWave shape
The invention converts built-in type rotor structure in conventional 'I'type to built-in type rotor structure in 'V'type, as well as sets up reinforced ribs between magnetic poles and sets up accessory pores above the said reinforced ribs. Changing distribution of deformation on surface of rotor diameter, the rotor structure in 'V'type makes maximal centrifugal stress point shift to reinforced ribs of rotor. The maximal centrifugal stress point is tensile stress restricted by tensile strength of material of rotor core. Since tensile strength of material of rotor core is larger than yield strength, thus, operating mechanical property of rotor at high speed is enhanced remarkably. Moreover, the said accessory pores can control waveform of air gap field, lightens weight of rotor, reduces centrifugal force, vibration and noise as well as improves operating mechanical property and other performances of motor.
Owner:SHANGHAI UNIV
Non-isolated modularization three-level parallel inverter and control method thereof and control system thereof
InactiveCN109302094AReduce high frequency componentsAchieving Resonance SuppressionAc-dc conversionSingle network parallel feeding arrangementsControl systemControl engineering
The present invention discloses a non-isolated modularization three-level parallel inverter and a control method thereof and a control system thereof so as to achieve inhibition of a common mode resonance current, a ring current and a leak current. According to the non-isolated modularization three-level parallel inverter, a main control is arranged to I-shaped three-level inverter modularizationparallel, a filter is an improved LCL filter which changes a common mode loop structure to achieve inhibition of the high-frequency ring current and the leakage current. In order to inhibit the commonmode resonance caused by the improved LCL filter, the common mode loop is provided with an active controller to achieve inhibition of the common mode resonance current. The non-isolated modularization three-level parallel inverter further achieve the low-frequency ring current inhibition, the balance control of a neutral-point voltage at a direct current side and current tracking and the resonance inhibition of a difference module loop.
Owner:SHANDONG UNIV
High resolution satellite attitude fluttering detection method based on intensive control points
ActiveCN104864852ADetect attitude flutterRestore the real statePicture interpretationExternal referenceReference image
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.
Owner:TONGJI UNIV
Video image processing method and device, electronic device and storage medium
ActiveCN110149554AReduce the uneven distribution of data volumeReduce mosaicTelevision system detailsColor television detailsBlock effectHigh frequency
Owner:GUANGDONG OPPO MOBILE TELECOMM CORP LTD
Corner smooth transition method based on track mode
ActiveCN111913441AAvoid resonanceImprove the efficiency of smoothingNumerical controlResonanceEngineering
The invention discloses a corner smooth transition method based on a track mode, which belongs to the technical field of numerical control processing and comprises the following steps of: constructinga track mode only containing three low harmonic components by utilizing a trigonometric function; initializing parameters; establishing equation constraint conditions related to boundary limitation,inequality constraint conditions related to motion contour limitation and a target function related to contour error limitation on a coordinate axis, and calculating trajectory parameters through linear programming and substituting thetrajectory parameters into a trajectory mode to obtain an axis motion trajectory; and adjusting the axis motion trails, and synthesizing the axis motion trails to obtain a corner transition curve. According to the method, a trajectory mode is utilized, corner transition curve construction and axial velocity planning are completed at the same time, the smoothing efficiency is effectively improved, and mechanical structure resonance is avoided; the shaft motion trail is smooth and only comprises three low-frequency components, the high-frequency components contained in the driving force / torque can be remarkably reduced, excitation to the vibration mode of the system is avoided, and high-speed and high-quality machining is achieved.
Owner:淮安欧特科技有限公司
Continuous-time oversampled converter having passive filter
ActiveCN103329442AReduce high frequency componentsReduce voltage fluctuationsAnalogue conversionCapacitanceConverters
A continuous-time sigma-delta analog-to-digital converter includes a first integrator stage to integrate a difference between a first differential signal derived from a differential analog input signal and a second differential signal derived from a quantized output signal, 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 first and second input nodes of the converter. The first and third input resistors are coupled in series between the first input node and a first input of the operational amplifier. The second and fourth input resistors are coupled in series between the second input node and a second input of the operational amplifier. The first and second input resistors are coupled to the third and fourth input resistors, respectively.
Owner:MEDIATEK SINGAPORE PTE LTD SINGAPORE
Method for solving interlace by using error correction and motion compensation as well as its equipment
InactiveCN1447598AImprovement effectSmall amount of calculationStandards conversionUser ErrorIt equipment
A method includes following steps. The difference between the original pixel measured in spatial neighborhood of the pixel to be interpolated and the corresponding motion compensation pixel. The saiddifference value is utilized to estimate the compensation error. The estimated error is used to correct the motion compensation. The devices for executing the method includes the error detector utilized to detect and measure the differences between several original pixels and the corresponding motion compensation pixels, and the correcting compensator utilized to estimate the said differences andcorrect the motion compensation. The invention possesses the advantages of less operation quantity and good compensation effect.
Owner:HANGZHOU NATCHIP SCI & TECH
Coordinating and smoothing control method for wind turbine generator and energy storing device
ActiveCN105201741AReduce high frequency componentsOutput Power Smooth ControlWind motor controlMachines/enginesElectricityPower 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.
Owner:海南电网有限责任公司 +2
Ultrasonic scalpel handle with ultrasonic generator function, ultrasonic scalpel system and using method of ultrasonic scalpel system
InactiveCN112237465AReduce usageReduce volumeMagnetic/electric field screeningSurgeryEngineeringEnergy converter
The invention discloses an ultrasonic scalpel handle with an ultrasonic generator function. The ultrasonic scalpel handle comprises a handle outer shell, a handle connecting mechanism integrated witha torque wrench is arranged at the head of the handle outer shell, and the handle connecting mechanism is used for being connected with a cutter; a cavity is arranged in the handle outer shell, and atransformer, an energy converter, a first PCB plate, a second PCB plate, gear keys and a handle are arranged in the cavity; the PCB power plate is arranged at the top of the cavity; the transformer isarranged at the tail end of the cavity; the PCB control panel is arranged at the position of a handle of the cavity; the first PCB plate and the second PCB plate can be set to be control panels or power panels; the gear key is arranged at the front part of the handle outer shell and is used for switching high and low power gears; and the handle is arranged at the front part of the handle outer shell and is used for controlling the opening and closing of the cutter. The invention further discloses an ultrasonic scalpel system with the ultrasonic generator function.
Owner:ENSURGE MEDICAL (SUZHOU) CO LTD
Fuel gas calorie control equipment and gas turbine system
InactiveCN1828029ASmall fluctuationReduce volatilityGas turbine plantsTurbine/propulsion fuel controlEngineeringProcess engineering
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.
Owner:MITSUBISHI HEAVY IND LTD
Improved virtual flux linkage orientation-based harmonic detection method
InactiveCN110146742ASolve the problem of large errors in the phase-locked resultsAchieving frequency adaptationSpectral/fourier analysisDesign optimisation/simulationIntegratorVirtual power
The invention discloses an improved virtual flux linkage orientation-based harmonic detection method. According to the method, a virtual power grid flux linkage is adopted as an improvement link of aphase-locked loop; the extraction of a positive sequence flux linkage is realized by means of a compound third-order generalized integrator and a positive and negative sequence component calculation module; on the basis that the phase angle and frequency of a power grid are accurately locked, the detection errors of a traditional ip-iq harmonic detection algorithm, which are caused by reasons suchas power grid voltage asymmetry, waveform distortion, direct-current offset component injection and even frequency change, are avoided, so that fundamental wave positive sequence current finally obtained by a system is basically free of distortion.
Owner:XUZHOU NORMAL UNIVERSITY
A High Resolution Satellite Attitude Flutter Detection Method Based on Dense Control Points
ActiveCN104864852BDetect attitude flutterRestore the real statePicture interpretationExternal referenceReference image
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.
Owner:TONGJI UNIV
Medical radio frequency output power adjusting method and system
PendingCN113225031AQuick responseImprove output waveformHigh frequency amplifiersPower amplifiersControl signalRadio frequency
The invention discloses a medical radio frequency output power adjusting method and system, and the method comprises the steps: S1, obtaining a radio frequency power signal outputted by a power amplification module; S2, judging whether the power of the output radio frequency power signal is smaller than a preset threshold value or not, and if not, adjusting the power of the radio frequency power signal through a power switch control signal adjusting method; if yes, adjusting the power of the radio frequency power signal through a voltage adjusting method; and S3, inputting the radio frequency power signal corresponding to the adjusted power into a power amplifier for processing, and outputting the processed radio frequency power signal by the power amplifier. According to the invention, quick response under high power and good output waveform (closer to sine wave) during low-power output are maintained. When the output waveform is close to a sine wave, high-frequency components are few, and an accurate sampling result can be obtained by using relatively low sampling frequency.
Owner:杭州象量医疗技术有限公司
Double-frequency transformer-free type single-phase photovoltaic grid-connected inverter
InactiveCN111864794AReduce high frequency componentsReduce switching frequencySingle network parallel feeding arrangementsPhotovoltaic energy generationCapacitanceTransformer
The invention relates to the technical field of inverters, in particular to a double-frequency transformer-free single-phase photovoltaic grid-connected inverter which comprises an inverter shell, a circuit board is arranged in the inverter shell, and a control unit and a main loop unit are arranged on the circuit board, the main loop unit is divided into a power unit and a resonance elimination unit, and the resonance elimination unit and the power unit are connected to two sides of a single-phase power grid in parallel; the bus cathode of the resonance elimination unit is connected with thebus cathode of the power unit through a connecting capacitor; the LA terminal and the LB terminal of the power unit are connected to the L terminal and the N terminal of a power grid through a power filter. The HA terminal and the HB terminal of the resonance elimination unit are connected to the L terminal and the N terminal of the power grid through a resonance elimination filter to form the main loop unit; through a novel topological structure and a control algorithm, the ground leakage current of the transformerless grid-connected inverter is effectively suppressed, and meanwhile, the overall efficiency and the power density of the inverter are improved.
Owner:NORTH CHINA UNIVERSITY OF TECHNOLOGY
Method and equipment for solving interlace by using error correction and motion compensation
InactiveCN1208960CSmooth changeRich in low frequency componentsStandards conversionAlgorithmMotion error
Owner:HANGZHOU NATCHIP SCI & TECH
Coordinated smooth control method for wind turbines and energy storage devices
ActiveCN105201741BReduce high frequency componentsOutput Power Smooth ControlWind motor controlMachines/enginesLow pass filteringEnergy analysis
Owner:海南电网有限责任公司 +2
Continuous Time Integral Delta Analog-to-Digital Converter
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.
Owner:MEDIATEK SINGAPORE PTE LTD SINGAPORE
Method and circuit device for reducing reception interferences, for receiving radio broadcasting signal
InactiveCN1159855CGain balanceReduce high frequency componentsGain controlCombination control in untuned/frequency-selective amplifying stagesLower limitControl signal
The invention relates to a method for detecting and reducing reception interferences, especially multiway reception interferences, in an input signal (E) of a radio receiver. According to said method, a reception interference of this type is detected in a detector device (10) and a corresponding detector signal (MWS, AMS, MKS) is transmitted to a processing device (20) which then evaluates this detector signal (MWS, AMS, MKS). A corresponding control signal (S) is then generated by the processing device (20) and transmitted to an audio unit (30), which generates an audio signal lying in a frequency interval delimited by a lower limit frequency (GO") and an upper limit frequency (GO'). The audio unit (30) lowers the level of the audio signal (A) generated by the same using the input signal (E) within the frequency range above a lowered upper limit frequency (G1', G2') below the aforementioned upper limit frequency (GO') of the audio signal (A). According to the invention, the level of the audio signal (A) is lowered in the range below a lower limit frequency that has been raised above the aforementioned lower limit frequency (GO") at the same time as the level of the audio signal (A) is lowered in the frequency range above the lowered upper limit frequency (G1', G2').
Owner:VOLKSWAGEN AG
Capacitive touch system and driving device thereof
ActiveCN103970380AReduce high frequency componentsReduce distractionsInput/output processes for data processingEngineeringElectrical and Electronics engineering
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.
Owner:ILI TECHNOLOGY CORPORATION
Method for denoising and filtering flat area
PendingCN113628118AReduce concentrationReduce high frequency componentsImage enhancementImage analysisDot pitchAlgorithm
The invention provides a method for denoising and filtering a flat area, which comprises the following steps of: S1, determining a block to be filtered which meets the following two conditions: 1) the number of gray values is 2, and the difference between the two gray values is 1; 2) the number of one gray value is larger than a set threshold value, and the number of the other gray value is smaller than the set threshold value, and the gray values are called a large probability gray value b and a small probability gray value s respectively; S2, denoising and filtering: 2.1, when the pixel point spacing is set to be 1, calculating the gray level co-occurrence matrix of the to-be-filtered block, judging the distribution condition of small-probability gray levels, wherein the smaller the number of the adjacent small-probability gray levels is, the larger the sum of diagonal lines is, and the more discrete the small-probability points are; on the contrary, the textures of the small probability points are thicker; reducing the filtering intensity of the small-probability gray block of the coarse texture; increasing the filtering intensity of discrete small-probability gray blocks; and S2.2, reducing blurring of the coarse texture or eliminating of the coarse texture. According to the method, the strong noise in the flat area is filtered, the residual error information amount is reduced, and the noise consumption of the code stream is further reduced.
Owner:北京君正集成电路股份有限公司
Driving method and system of voice coil motor, camera module and mobile phone
ActiveCN111510603BReduce high frequency componentsReduce the overshoot valueTelevision system detailsColor television detailsVoice coilDigital-to-analog converter
Owner:SHANGHAI AWINIC TECH CO LTD
Isolated voltage compensation circuit
InactiveCN102208874BReduce high frequency componentsReduce processing requirementsAc-ac conversionHarmonic reduction arrangementCapacitanceVoltage spike
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.
Owner:ZHEJIANG UNIV
Capacitive touch system and its driving device
ActiveCN103970380BReduce high frequency componentsReduce distractionsInput/output processes for data processingElectrical and Electronics engineeringHigh frequency
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.
Owner:ILI TECHNOLOGY CORPORATION
Intelligent positioning method and device for impact load
InactiveCN114200398AHigh sensitivityReduce high frequency componentsNavigational calculation instrumentsPosition fixationSensor arrayGrating
The invention provides an intelligent positioning method and device for an impact load, and belongs to the technical field of impact positioning. The problem of impact positioning in the prior art is solved. According to the intelligent positioning method and device for the impact load, sensor arrays arranged in four directions around an impact area are included, each direction sensor array comprises two sensors arranged in the outward radiation direction relative to the center of the impact area, and the four sensor arrays are located in the same plane. The shock wave velocities of the two sensors of the sensor array can be approximately the same, so that the number of unknown numbers can be reduced, and the equation set can be solved. The included angle between the axial direction of the sensor and the shock wave propagation direction is larger than or equal to 45 degrees, at the moment, the sensitivity of the fiber bragg grating sensor is high, meanwhile, high-frequency components in amplitude-frequency characteristics are few, and detection of the sensor is facilitated. The detection precision is improved by eliminating the sensor array with the largest included angle with the impact source.
Owner:CHINA JILIANG UNIV
Motorcycle
ActiveCN101619667BPrevent flow noiseReduce high frequency componentsSilencing apparatusMachines/enginesEngineeringExpansion chamber
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.
Owner:YAMAHA MOTOR CO LTD
A Smooth Corner Transition Method Based on Trajectory Mode
ActiveCN111913441BAvoid resonanceImprove the efficiency of smoothingNumerical controlClassical mechanicsContour error
The invention discloses a corner smooth transition method based on a trajectory mode, which belongs to the technical field of numerical control processing and comprises the following steps: using trigonometric functions to construct a trajectory mode containing only three low harmonic components; initializing parameters; On the above, establish the equality constraints on the boundary limit, the inequality constraints on the motion contour limit and the objective function on the contour error limit, use linear programming to calculate the trajectory parameters and substitute them into the trajectory mode to obtain the axis motion trajectory; adjust the axis motion trajectory, Synthesize the axis motion trajectory to obtain the corner transition curve. The invention utilizes the trajectory mode to complete the corner transition curve construction and shaft speed planning at the same time, effectively improving the efficiency of smoothing and avoiding mechanical structure resonance; the shaft motion trajectory is smooth and only contains three low-frequency components, which can significantly reduce the driving force / moment The high-frequency components contained in it avoid the excitation of the vibration mode of the system and realize high-speed and high-quality processing.
Owner:淮安欧特科技有限公司
Video image processing method, device, electronic device and storage medium
ActiveCN110149554BReduce high frequency componentsReduce the problem of uneven distribution of data volumeTelevision system detailsColor television detailsPattern recognitionComputer graphics (images)
The embodiment of the present application discloses a video image processing method, device, electronic equipment and storage medium. The method includes acquiring a video image to be processed collected by an image acquisition component; performing blurring processing on the video image to be processed by using a target low-pass filter, and the blurring processing is used to reduce high frequency component; encoding and compressing the video image to be processed after the fuzzy processing to obtain a target video image; transmitting the target video image. This method reduces the high-frequency components in the video image by blurring the video image data before being input to the encoder, and can reduce the problem of uneven data distribution when the processed video image is encoded by the encoder. In turn, after the overall encoding of the video, the mosaic and block effects are reduced during playback, and the fluency of playback is improved.
Owner:GUANGDONG OPPO MOBILE TELECOMM CORP LTD
Image compression processing method and device, electronic equipment and storage medium
PendingCN114189689ANo change in resolutionEliminate dependenciesImage codingDigital video signal modificationComputer graphics (images)Imaging quality
The invention provides an image compression processing method and apparatus, an electronic device and a storage medium. The method comprises the steps of obtaining a to-be-processed Bayer image; wherein the Bayer image to be processed adopts GRBG * color arrangement; the GRBG * color arrangement in the Bayer image to be processed is converted into YUVY * color arrangement; performing format conversion on the data of the YUVY * color arrangement to obtain target color array data; filtering the target color array data; and carrying out compression processing on the filtered target color array data. According to the image compression processing method and device, the electronic equipment and the storage medium provided by the invention, the resolution ratio of the image before and after compression processing can be ensured to be unchanged, meanwhile, the correlation of RGB color space is eliminated, the high-frequency component between pixels is reduced, and the image quality is improved.
Owner:广州思德医疗科技有限公司
Performance warning method and device
ActiveCN104468206AReduce high frequency componentsReduce low frequency componentsData switching networksReal-time computingHigh frequency
The embodiment of the invention provides a performance warning method and device. The method includes the steps of obtaining a first performance data set, wherein the first performance data set comprises M performance data corresponding to first performance; conducting smooth filtering on the first performance data set so as to determine the first performance data set where filtering is conducted; determining whether to trigger the performance warning corresponding to the first performance or not according to the performance data in the first performance data set where filtering is conducted. By means of the technical scheme, high-frequency components and low-frequency components in the performance data can be reduced, and the shock of the performance data can be reduced. Thus, the frequency performance warning and warning recovery caused by the shock of the performance data can be reduced.
Owner:HUAWEI TECH SERVICE
PLL circuit
ActiveCN106209082BHigh frequencyReduce high frequency componentsPulse automatic controlVoltage converterPhase detector
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.
Owner:IPGOAL MICROELECTRONICS (SICHUAN) CO LTD
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