72 results about "Phase inversion" patented technology

The invention relates to the technical field of radio frequency signal processing, and discloses a digital filtering repair method and system for signal distortion, and the method comprises the steps: obtaining a frequency domain amplitude-frequency response and a phase response; constructing a phase compensation amount by adopting piecewise polynomial fitting and a phase inversion mechanism; a complex number logarithm domain mapping mechanism is adopted to execute composite frequency response inversion; constructing a switchable hybrid digital filter with an amplitude path and a phase path coupled in parallel; multi-band adaptive scheduling is executed; and outputting the radio frequency baseband signal stream. The technical problems that in the prior art, frequency response nonlinear distortion in a broadband range cannot be dealt with by adopting a fixed template or a single-path filter, and particularly, a high-precision and low-delay dynamic compensation effect cannot be realized in a scene that multi-band coupling interference exists in a radio frequency ADC channel with the bandwidth exceeding 800MHz are solved. Due to the fact that the switchable hybrid digital filter is constructed, accurate modeling and flexible recovery of distortion characteristics in broadband signals are achieved.

The invention discloses a building electrical circuit arc fault multi-dimensional detection and positioning method and system. The method comprises the following steps: injecting a low-amplitude broadband excitation signal into a key node of a power distribution loop through an electromagnetic excitation and sensing device, collecting a line response waveform and establishing a steady-state electromagnetic response baseline; performing self-correlation operation and spectral analysis based on the baseline, extracting formant frequency, energy distribution and bandwidth characteristics, and generating an electromagnetic modal characteristic fingerprint; through constructing a time-frequency coupling resonance matrix, formant frequency shift amount and energy gradient change are monitored in real time, and an abnormal resonance state of a line is identified. After abnormality is detected, establishing a spatial positioning equation according to multi-node phase distribution, and determining the position of an arc or a breakdown source by adopting a phase inversion algorithm; calculating a line stability coefficient by combining a positioning result and time sequence resonance data, and predicting an arc risk level; when the risk level exceeds a threshold value, an electromagnetic compensation module is activated, an opposite-phase suppression signal is generated and injected into an abnormal area, and active protection closed-loop control is achieved.

The invention discloses a method and a system for determining a multi-loop control parameter setting value of a network-constructed converter, and relates to the technical field of network-constructed converters, and the method comprises the following steps: based on the real-time operation state of a voltage outer loop of the network-constructed converter, extracting a time synchronization sequence of a delay compensation amount and a phase offset amount, generating a dynamic response curve of the voltage outer loop after sudden change of the external load is triggered; and according to the dynamic response curve, performing self-constraint processing on the delay compensation amount. According to the invention, through the self-constraint and amplitude limiting control of the delay compensation amount, the virtual impedance keeps inductive response under the sudden change of the load, energy reflux and oscillation caused by phase inversion are prevented, and the voltage stability and the dynamic response performance are improved; meanwhile, multi-loop coordination and energy self-balancing are achieved through energy flow balance regulation and self-adaptive damping adjustment, high-frequency energy fluctuation is effectively restrained, and stable operation and parameter setting precision of the grid-forming type converter under the complex working condition are guaranteed.

The invention provides a gain-reconfigurable active phase shifter with a low phase error, and relates to the technical field of phase shifters, and the phase shifter comprises a quadrature coupler which converts a radio frequency input signal into a shunt radio frequency signal; the input matching Balun converts the shunt radio frequency signal into a shunt differential signal; the digital control signal received by the phase inversion variable gain amplifier is used for controlling the on-off state of a differential pair in each differential group, and determining a differential combination current corresponding to a differential pair combination in a conduction state based on a shunt differential signal corresponding to each differential pair; the differential combination current is used for representing a gain state corresponding to the differential pair combination; the input impedance and the output impedance of the phase inversion variable gain amplifier in different gain states are kept unchanged; the vector synthesis module determines a phase shift differential signal based on the differential combined current; the output matching Balun converts the phase shift differential signal into a radio frequency output signal. The antenna has a wide gain adjustable range and a low phase error.

The utility model discloses an online emulsification phase inversion pump for waterborne polyurethane, and relates to the technical field of raw material processing, the online emulsification phase inversion pump comprises a pump body shell B, the peripheral surface of a driving shaft is fixedly sleeved with a rotor A mounted at a stirring bin B, and a sleeve disc A matched with the bottom of a stator B is fixedly arranged at the position, below the rotor A, of the peripheral surface of the driving shaft; a plurality of cutting columns A matched at the stirring bin C are annularly and fixedly installed at the top of the sleeve disc A at equal intervals, a sleeve disc B matched at the bottom of the stator B is fixedly arranged at the position, located above the sleeve disc A, of the peripheral surface of the driving shaft, and a plurality of cutting columns B matched at the stirring bin C are annularly and fixedly installed at the top of the sleeve disc B at equal intervals. The rotor A, the rotor B, the cutting column A and the cutting column B are driven by the driving shaft to rotate, and in the process that a solution flows through different stirring bins A, B, C and D, the solution is stirred, cut, shunted and scattered for multiple times, so that the solution can be more quickly and fully mixed together.

The invention relates to a method for influence of dislocation dipole defects in an aluminum matrix on acoustic parameters, belongs to the technical field of discrete solution, and provides a novel molecular dynamics simulation method for researching ultrasonic sound velocity, sound attenuation and acoustic nonlinear parameter change on the basis of two dislocation dipole structures. The method specifically comprises the following steps: controlling the type and the number of dislocation dipoles in an aluminum matrix, carrying out atomic scale acoustic simulation on dislocation dipole models of different types and numbers by adopting a phase inversion technology, extracting sound velocity by adopting a cross correlation method, extracting sound attenuation by adopting a Hilbert transformation method and extracting acoustic nonlinear parameters by adopting an FFT method aiming at four-phase signals; and precise extraction of acoustic parameters is realized. And determining the contribution of the dislocation defect to the acoustic parameters based on the relationship fitting of the three acoustic parameters and the dislocation defect, thereby realizing the prediction from the acoustic parameters to defect characteristics.

The invention relates to the field of masks, and discloses a mask and a control method thereof, the mask comprises a mask body, a secondary sound source device and a voice signal acquisition part; the mask body comprises a mouth and nose wrapping structure and a mask shell, and the mouth and nose wrapping structure is connected with the mask shell; the voice signal acquisition part comprises a main microphone, and the main microphone is arranged on the inner side of the mouth and nose wrapping structure; the secondary sound source device is arranged on the outer side of the mask shell and works based on a control instruction. According to the mask, user sound or environmental noise is collected through the voice collecting part, the secondary sound source device sends out corresponding sound according to user requirements or conducts phase reversal processing on sound waves, and sound opposite to the user is sent out to achieve sound wave counteracting near the air outlet so as to achieve the purpose of active noise reduction; or scrambling signals such as white noise, environment sound and scene sound are generated, and user voice is hidden to the maximum extent; or the sound of the user is amplified, so that the sound is clearer and more stable.

The invention discloses electronic equipment, and belongs to the technical field of electronic products. The electronic equipment is provided with a loudspeaker rear cavity. The electronic equipment comprises a heat dissipation piece, the heat dissipation piece is provided with a heat dissipation air channel, an air inlet and an air outlet are formed in the two ends of the heat dissipation air channel respectively, at least part of the heat dissipation air channel forms a first phase inversion channel, and the first phase inversion channel is communicated with at least one of the air inlet and the air outlet and a loudspeaker rear cavity; and / or, the electronic equipment comprises a circuit board support, a part of the circuit board support is overlapped on one side of the loudspeaker rear cavity, a second phase inversion channel is formed in the circuit board support, and the second phase inversion channel is communicated with the loudspeaker rear cavity and the outside.

This invention discloses a level shifting circuit, including a delay signal generation module and a first voltage domain shifting module and a second voltage domain shifting module coupled to each other. The delay signal generation module is electrically connected to an input signal and is used to output different voltage signals after performing different phase inversions and delays on the input signal. The first voltage domain shifting module obtains the output voltage signal of the delay signal generation module by electrically connecting to several ports of the delay signal generation module. The voltage domain shifting module controls the output of a first output voltage based on the output voltage signal of the delay signal generation module. This invention enables individual pull-up and pull-down of the output signal, thereby achieving extremely low transmission delay during signal level shifting, accelerating signal transitions, and maintaining consistent delays, thus protecting the use of MOSFETs.

The utility model relates to the technical field of signal processing, in particular to an audio signal amplification circuit and audio equipment. The circuit comprises a phase switching unit and a signal amplification unit, the first end of the phase switching unit is connected with an external input signal, the second end of the phase switching unit is connected with the first input end of the signal amplification unit, the third end of the phase switching unit is connected with the second input end of the signal amplification unit, and a change-over switch is arranged in the phase switching unit. When the change-over switch is in an open state, the signal amplification unit carries out voltage amplification processing on the external input signal, and when the change-over switch is in a closed state, the external input signal is subjected to phase inversion and then is subjected to voltage amplification processing. By switching the phase state of the switch, reverse or normal amplification of the signal is realized, the requirement of the audio effect is met, and the application scene of the audio equipment is expanded.

This invention discloses a pressure- and collapse-resistant porous nano-mass transfer membrane and its preparation method, belonging to the field of membrane separation technology. The mass transfer membrane comprises a macroscopically rigid substrate layer, a thermosetting polyimide mesoporous support layer formed by crosslinking with aliphatic diamines, and a highly crosslinked polyurea ultrathin active layer formed by the in-situ reaction of diisocyanate and diamine. The preparation method mainly involves forming a polyimide porous membrane on the substrate layer through phase inversion, followed by in-situ crosslinking to construct the support layer, and finally forming the active layer on the surface of the support layer using electro-spraying technology. This composite membrane structure significantly improves overall rigidity and compressive strength, maintaining excellent permeate flux, high desalination rate, and stable pore structure under harsh conditions of ≥250 bar high pressure, high salt, and high temperature for extended periods, making it suitable for high-pressure separation processes such as seawater desalination and high-salt wastewater treatment.

The invention belongs to the technical field of proton conducting membrane preparation, and particularly relates to a preparation method of a polybenzimidazole membrane with flexibility and proton conductivity. The preparation method comprises the following steps: dissolving polybenzimidazole resin in a low-boiling-point high-polarity aprotic solvent, adding a high-boiling-point thermal expansion agent and continuously stirring in a swelling state of the polybenzimidazole resin, blade-coating the surface of a glass plate with the prepared resin solution, carrying out heat treatment at a certain temperature, and evaporating the low-boiling-point solvent to obtain a film; putting the obtained film into a leaching solution to leach the thermal expansion agent; and carrying out heat treatment on the retreated film to obtain the polybenzimidazole membrane with both flexibility and proton conductivity. In the preparation process, the cross-linking effect between molecular chains is weakened by controlling the phase inversion temperature, the boiling point of the solvent and the expansion characteristic of the thermal expansion agent, the rigid structure of the polybenzimidazole membrane is relaxed, meanwhile, more free volume is provided for proton conduction, the problems of poor proton conductivity and flexibility of the polybenzimidazole membrane are solved, the operation is simple, and the preparation method is suitable for industrial production. The method is suitable for large-scale production.

The application is a method for the influence of dislocation dipole defects in aluminum matrix on acoustic parameters, belonging to the technical field of discrete solution, and provides a new molecular dynamics simulation method for researching the changes of ultrasonic velocity, acoustic attenuation and acoustic nonlinear parameters based on two dislocation dipole structures, specifically, the types and quantities of dislocation dipoles in the aluminum matrix are controlled, the atomic scale acoustic simulation is carried out on the dislocation dipole models of different types and quantities by using the phase inversion technology, the cross correlation method is used to extract the sound velocity, the Hilbert transform method is used to extract the sound attenuation, and the FFT method is used to extract the acoustic nonlinear parameters for the four-phase signals, so as to realize the precise extraction of acoustic parameters. Based on the fitting relationship between the three acoustic parameters and the dislocation defects, the contribution of the dislocation defects to the acoustic parameters is determined, and the prediction from the acoustic parameters to the defect characteristics is realized.

The embodiment of the utility model provides a brushless direct current motor driving control circuit, comprising a microcontroller module which integrates a Hall signal input end, a PWM signal output end and a timer unit, generates commutation logic through a Hall sensor feedback signal, and adjusts the PWM duty ratio to control the rotating speed of a motor; the three-phase inversion driving module forms a half-bridge circuit through high-voltage and low-voltage driving tubes and is connected with a three-phase winding of the motor; the power supply management module provides stable power supply voltage through the DC-DC boost / buck unit and the multi-stage filter capacitor group. Through the high-integration design, the reversing precision and the low-speed stability are improved, the power supply noise is suppressed, a multi-dimensional protection mechanism is integrated, and the high-precision driving device is suitable for high-precision driving scenes such as electric vehicles and unmanned aerial vehicles.

The present application relates to a kind of microchannel electrode support and its preparation method and application, the electrode support is relatively provided with dense layer and porous layer along the thickness direction, microchannel is provided between the dense layer and porous layer, the microchannel extends from the dense layer to the porous layer direction;The microchannel is variable-diameter channel, its aperture gradually decreases from the dense layer to the porous layer along the extension direction.Pore size distribution of the electrode support is 0.5~40 μm, the thickness is 600~1500 μm, porosity is 30~70%.The microchannel electrode support is mainly prepared by phase inversion process, is formed by key steps such as solvent replacement, constant temperature drying and high-temperature calcination in turn.Compared with prior art, the microchannel electrode support of the present application maintains high porosity under high temperature conditions, so that fuel gas and oxygen can be quickly absorbed and released, thereby accelerating the chemical reaction rate, improve the working efficiency of SOFC / SOEC.

The present disclosure relates to a spinning beam for producing hollow fiber membranes in a phase inversion process, and to a process using the spinning beam.

The invention discloses a ring oscillator, which comprises a control unit used for responding to an external control voltage and generating a corresponding bias current; the output end of the oscillation unit of the last stage connected in series is connected with the input end of the oscillation unit of the first stage to form an annular structure; the oscillation unit is used for working in a current limited state under the action of the bias current and performing phase inversion and delay processing on an input signal to generate an oscillation signal; by continuously adjusting the external control voltage, the bias current and the time delay of the oscillation unit are changed, and then continuous adjustment of the frequency of the output oscillation signal is achieved. Provided is a ring oscillator capable of linearly and finely tuning an oscillation frequency with low power consumption and high stability.

The invention discloses a PVA-GO-coated UiO-66-coated PMIA photo-thermal composite membrane as well as a preparation method and application thereof. The photo-thermal composite membrane is a composite membrane with a three-stage structure of a support layer, a middle layer and a separation layer. UiO-66 nanoparticles are firmly anchored on the surface of a PMIA primary membrane successfully through a spraying-phase inversion process, an intermediate layer with a uniform structure is formed, and PMIA molecular chains permeate and diffuse into mesopores on the surfaces of the UiO-66 nanoparticles to a certain extent at the initial stage of phase inversion; and finally, further spraying a PVA-GO mixed solution with a photo-thermal response function on the intermediate layer, wherein the separation layer and the intermediate layer form an interpenetrating structure. The composite membrane prepared by the innovative process not only has excellent desalting performance, but also has excellent long-term stability and photo-thermal response reversibility, realizes effective integration of the selective transmission capability of an MOF material and the photo-thermal conversion characteristic of GO, and provides a new way for developing a low-carbon and efficient water treatment technology.

The application discloses a magnetic suspension fan rotor dynamic balance adjusting device and method, and relates to the technical field of self-adaptive adjustment.The method comprises the following steps: collecting suspension bearing displacement signals, magnetic suspension coil current signals, machine body vibration acceleration signals, motor end electromagnetic response signals and rotor angular displacement parameters, and constructing a rotor operation signal set; respectively pre-processing and extracting features of the signals to obtain four types of feature data; inputting the comprehensive feature data into a rotor balance diagnosis model to identify the rotor unbalance state; solving the amplitude and phase adjustment amount of the virtual counterweight based on the amplitude and phase inversion algorithm and injecting the suspension coil to perform adjustment; judging whether dynamic correction is needed according to the real-time comprehensive feature data, generating a dynamic gain coefficient to correct the adjustment parameters when needed, and then injecting the suspension coil again; the application realizes real-time identification and self-adaptive adjustment of the mass unbalance vibration of the magnetic suspension fan rotor, effectively suppresses the rotor operation vibration, and improves the balance stability and reliability of the system.

The application belongs to the field of polymer material repair and relates to a preparation method of a composite preparation for repairing aged asphalt, which comprises the following steps: mixing 15-35 parts by weight of a bio-based ester softening component, 5-12 parts by weight of a polarity inducing component and 3-8 parts by weight of an emulsifying aid to construct an oil phase base material with a polarity gradient; dispersing the oil phase base material in water and a stabilizing component by high shear to obtain an oil-in-water kinetic stable microemulsion with a droplet particle size of 50-150 nm; and adding 1-4 parts by weight of an ionic strength triggering component to obtain the composite preparation. The application utilizes the interface in-situ nonlinear phase inversion mechanism triggered by ionic strength to drive the repair component to actively penetrate into the deep micropores of the matrix to be repaired, realizes the molecular-level eutectic melting of the repair component and the aged matrix, restores the sol-gel balance in the matrix, solves the technical problem that the activation is insufficient due to the limited penetration capacity of the conventional preparation, and improves the viscoelastic properties of the regenerated material.

The application provides an exponential decay-based time-frequency domain phase inversion method for obtaining high-precision velocity modeling of the underground. The method can suppress the phase noise interference caused by the conventional time-frequency domain phase inversion method and improve the precision of velocity modeling. First, the seismic data is transformed into the time-frequency domain, a time-frequency domain phase inversion objective function is constructed, and a decay factor is introduced to achieve the effect of layered multi-scale inversion. Then, the gradient and the accompanying source of the time-frequency domain phase inversion objective function based on the exponential decay are derived. Finally, the local optimization algorithm is used to update the velocity model, and a better initial model is provided for the conventional full waveform inversion. The application uses the Marmousi velocity model for numerical test and verifies that the method can provide a better initial velocity modeling for the conventional FWI and obtain high-precision inversion results.

The application relates to the technical field of smart grids, and discloses a bidirectional current smooth switching control method for single-phase inversion, which comprises the following steps: collecting inductance current and bus voltage to establish a current zero-crossing prediction window; obtaining a nonlinear equivalent junction capacitance function of a power device, and determining a commutation critical charge amount required by bridge arm turnover according to the function; combining the charge amount and a current change rate to determine a pre-excitation pulse width, and inserting an energy pre-excitation pulse before the turn-off edge of a modulation signal to neutralize parasitic charges and establish a transient current increment; detecting an actual turnover time of voltage and comparing the actual turnover time with a reference center point, and correcting the pulse width of a subsequent period in real time according to a deviation; the application establishes an energy hedging mechanism, solves the technical problem of insufficient kinetic energy of bridge arm turnover under low current, eliminates a zero-crossing controlled blind area, and ensures the physical continuity of current waveforms in bidirectional power switching.

A scan driver, a display device, and an electronic device including the display device are provided. The scan driver includes: a plurality of signal pads configured to receive a gate control signal from an external source; a phase inversion circuit unit configured to invert a phase of at least one gate control signal in response to at least one other gate control signal among the gate control signals respectively supplied through the plurality of signal pads, and output the gate control signal having the inverted phase as an output timing signal; and a stage circuit configured to sequentially output a scan signal to a scan signal line of the image display area based on at least one of the output timing signal and the gate control signal.

A balun circuit addresses the bandwidth issue by using symmetric amplitude division and phase delay networks to convert single-ended signals to differential signals. Because the balun circuit's balance characteristics are guaranteed over a very wide bandwidth, other performance characteristics that can limit the operating bandwidth, such as impedance matching and insertion loss, can be carefully addressed without concern for amplitude and phase balance. A balun circuit splits a single-ended signal into four differential paths through symmetric networks and applies phase inversion by inverting the polarity of each differential path, thereby reducing the complexity, size, and loss of the balun circuit's overall configuration.

The application relates to a converted wave shear wave splitting calculation method and system, equipment and a storage medium, and belongs to the technical field of oil and natural gas geophysical exploration. The method comprises the following steps: respectively pre-processing, sorting and dynamic correction of converted wave radial component data and converted wave tangential component data; synchronously dynamic correcting radial component gather data and tangential component gather data; respectively performing azimuthal division on the obtained radial component data and tangential component data after synchronization; based on the azimuthal division obtained common receiver point radial component and tangential component azimuthal division gather, a phase inversion method and a phase-constrained least square method, the shear wave splitting is calculated according to a vertical layer. The application combines the advantages of the phase inversion method and the least square method, has lower requirements on input data, is suitable for the situation of low signal-to-noise ratio data and irregular acquisition data, and improves the shear wave splitting calculation precision.

The application relates to a preparation device and method of a filter membrane, in particular to a device and method for continuously preparing a porous filter membrane. The application aims to provide a device and method for continuously preparing a porous filter membrane, which can effectively control the pollution of a gel tank. The device and method are characterized in that the material naturally falls under the action of gravity and accurately falls into a material receiving disc arranged in water, so as to avoid the material from continuously falling and polluting the filter membrane and the equipment roller shaft in operation, by utilizing the characteristics that the casting membrane liquid spontaneously occurs phase inversion and forms solid particles after dropping into water.

This application relates to an LN phase inversion detection and correction circuit and an energy storage device, comprising: a first relay and a second relay; a comparison and judgment module, configured to compare a first voltage signal and a second voltage signal and output a first phase difference judgment signal when the first relay is closed; or, to compare the first voltage signal and the second voltage signal and output a second phase difference judgment signal when the second relay is closed; and a driving module, configured to drive the first relay to close and the second relay to open when the first phase difference judgment signal indicates that there is no phase difference; drive the second relay to close and the first relay to open when the first phase difference judgment signal indicates that there is a phase difference; or, drive the second relay to close and the first relay to open when the second phase difference judgment signal indicates that there is no phase difference; and drive the first relay to close and the second relay to open when the second phase difference judgment signal indicates that there is a phase difference. This circuit can realize LN phase inversion detection and correction.

The embodiment of the invention provides an operational amplifier phase inversion suppression circuit which comprises a comparison module and a phase control module, the input end of the comparison module is used for being connected with the normal-phase input voltage and the inverted-phase input voltage of an operational amplifier, and when the normal-phase input voltage is smaller than the detection voltage, the phase control module is used for controlling the phase inversion of the operational amplifier. The comparison module outputs a first comparison signal; when the inverted input voltage is smaller than the detection voltage, the comparison module outputs a second comparison signal; the input end of the phase control module is used for being connected with the output end of the comparison module, the output end of the phase control module is connected with a target port of the operational amplifier, and when the phase control module receives the first comparison signal, a first control signal is output to the target port; controlling the output end of the operational amplifier to keep low level; and when the phase control module receives the second comparison signal, a second control signal is output to the target port, and the output end of the operational amplifier is controlled to keep high level. The phase reversal suppression effect of the operational amplifier is achieved.

The application provides an analysis method for ultrasonic harmonic influence on carbon precipitates in an iron matrix based on molecular dynamics, and belongs to the technical field of simulation of acoustic nonlinear effects of carbon precipitates, and comprises the following steps: a model of carbon precipitates in the iron matrix containing different coherence states and different sizes of Fe 23 C6 is constructed; the coherence state is divided into mixed precipitation and completely incoherent precipitation satisfying the N-W relationship; molecular dynamics simulation setting and relaxation treatment are performed on the model to obtain a stable model; an ultrasonic wave is excited by using a phase inversion method, and a second harmonic signal of a receiving area is extracted; a correlation between the second harmonic and the coherence and size of the carbon precipitates is analyzed to obtain an ultrasonic harmonic influence law. The application directly reveals the influence law of the coherence and size change of the carbon precipitates on the ultrasonic second harmonic by using the molecular dynamics simulation, provides a microscopic theoretical basis for nonlinear ultrasonic detection of high-temperature steel thermal damage, reduces experimental cost, and improves detection precision.