776 results about "Phase control" patented technology

A reconfigurable intelligent surface. The reconfigurable intelligent surface comprises a three-layer structure, comprising an artificial microstructure array capable of reflection and transmission within a specific frequency band range. By applying an external voltage to control the on / off of a semiconductor switch, an original phase shift structure is changed, ultimately achieving phase control of reflection and transmission. In addition, the structure is simple, can be realized by a microfabrication means, involves a mature process, and is easy to implement in high-frequency bands such as millimeter-wave and terahertz bands.

The invention provides an acoustic coalescence elimination method for hydrogen bubbles in molten aluminum, and belongs to the technical field of molten aluminum bubble elimination. According to the method, sound field collaborative focusing is achieved by arranging a phase control array transducer set in a molten aluminum smelting furnace, primary gathered sound waves and efficient coalescence sound waves are applied in stages according to bubble size evolution in a double-frequency scanning mode, and the hydrogen bubbles in the molten aluminum are eliminated. A target frequency is dynamically adjusted in combination with a bubble resonance frequency optimization model to match the inherent frequency of a bubble, a sound-bubble coupling dynamic tracking system is used for monitoring bubble evolution triggering stage switching in real time, and a sound field focus point dynamically scans and covers a three-dimensional space area through phase delay control. A delay detection method is adopted to eliminate cavitation bubble interference and accurately measure the hydrogen content, sound intensity and frequency parameters are optimized according to a sound field parameter self-adaptive regulation and control model, and the technical problem that hydrogen bubbles in a molten aluminum deep area are difficult to be effectively driven by sound waves and cannot be fully coalesced and eliminated is solved.

The invention discloses a phase-adjustable large-current generator, and the generator comprises a main circuit module, and a topological structure of the main circuit module employs a multi-stage IGBT inverter; the phase control module inputs a power grid voltage signal through a voltage transformer, adopts an SOGI-PLL structure to improve signal tracking precision, and combines a virtual synchronous machine technology to enhance system balance and a self-adaptive control strategy to dynamically adjust an output signal so as to realize phase control and synchronization; the electromagnetic compatibility optimization module adopts a layered shielding design and is combined with an optical fiber to transmit a control signal, so that the electromagnetic compatibility of equipment is improved; a relay protection test integration module, wherein the relay protection test integration module comprises a differential protection test mode and a distance protection test mode; according to the invention, the problems of low phase adjustment precision, poor synchronization stability and insufficient electromagnetic compatibility of a large current generator in a new energy grid-connected environment are solved.

The invention discloses a converter grid following-grid construction control mode smooth switching method suitable for wide-range source-grid state change. The method comprises the following steps: constructing a phase-locked loop control loop, a power outer loop control loop and a current inner loop control loop of a grid following type converter based on constant power control; constructing a voltage control loop, a phase control loop and a voltage and current double-closed-loop control loop of the network construction type converter based on the virtual synchronous generator VSG; calculating real-time output active power P and reactive power Q of the converter; constructing a voltage phase synchronization loop switching control loop and a current instruction tracking loop, and realizing smooth switching of dq-axis current instruction values output by a power outer loop of a following network type and a voltage outer loop of a construction network type; and the output dq-axis current instruction value is transmitted to a current inner loop to generate a final voltage signal, and a PWM wave is output to the converter through a modulation link. According to the method, a voltage phase synchronous switching compensation mechanism is adopted, a voltage amplitude and a phase signal are synchronously corrected in the mode switching process, and smooth change of an inner ring current reference signal is achieved.

The invention relates to a transient enhanced multi-phase Buck converter and a control method thereof, and the method comprises the steps: continuously monitoring and outputting a voltage reduction signal through a capacitance current sampling module, calculating a to-be-judged voltage signal, and outputting a high-level judgment signal when the to-be-judged voltage signal is greater than a reference voltage VTH1; after receiving the signal, the phase control module forcibly outputs logic control signals which are all high levels to the self-adaptive conduction time generation module; the multi-phase current conversion module synchronously conducts all single-phase Buck conversion circuits in the multi-phase current conversion module accordingly, so that the single-phase Buck conversion circuits simultaneously work to output the maximum current, and severe fluctuation of the output voltage is rapidly inhibited; and when the full-phase forced working mode is maintained until the voltage signal to be judged corresponding to the new voltage reduction signal is smaller than the reference voltage VTH2 again, the transient is relieved, and the system is automatically switched back to the conventional minimum current phase interleaving control mode. According to the scheme, the problem of response lag of a traditional multi-phase Buck under extreme load transient can be effectively solved.

A multi-phase switching converter provided according to an aspect of the present disclosure includes a power stage and a phase controller, and provides a regulated supply voltage from an input voltage in a light load condition. The power stage receives a phase control signal and drives an inductor to cause flow of an inductor-current according to the phase control signal, wherein a load-current of the multi-phase switching converter is formed from the inductor-current. The phase controller receives a current signal from the power stage at a pin, the current signal being in an analog continuous form to represent the inductor-current in the power stage. The phase controller integrates the current signal in the analog continuous form to generate a voltage-output representing a magnitude of the load-current, and determines the magnitude of load-current based on the voltage-output.

A circuit for slew rate detection and phase control in a multi-phase converter is provided. The circuit includes a first comparator configured to trigger when an output voltage of the multi-phase converter falls to a first output voltage level threshold value. The circuit further includes a second comparator configured to trigger when the output voltage falls to a second output voltage level threshold value which is lower than the first output voltage level threshold value. The circuit further includes a timer configured to start to run for a predefined time window, when the output voltage of the multi-phase converter falls below first output voltage level threshold value. The circuit further includes phase control logic configured to distinguish the ramp rate of the output voltage of the multi-phase converter as corresponding to a slow-rate ramp, a mid-rate ramp or a fast-rate ramp based on the outputs of the first comparator, the second comparator and the timer and enable phases synchronously or asynchronously based on the distinguishing of the ramp rate of the output voltage of the multi-phase converter as corresponding to the mid-rate ramp or the fast-rate ramp.

Integrated circuit transceivers having digital timing recovery loops with phase interpolation may incorporate dynamic loop gains to compensate for nonlinearities of the phase interpolation. An illustrative receiver circuit includes: a phase interpolator, a sampling element, a timing error estimator, and a feedback circuit. The phase interpolator provides a sampling signal by applying a phase shift to a clock signal in response to a phase control signal. The sampling element produces a digital receive signal by sampling an analog receive signal in accordance with the sampling signal. The timing error estimator produces a timing error signal indicating an estimated timing error of the sampling signal relative to the analog receive signal. The feedback circuit derives the phase control signal from the timing error signal using a scaling element configured to scale the estimated timing error by a scale factor that depends on the phase control signal.

The utility model provides a phase shifter based on a waveguide transmission line, comprising a waveguide transmission line, a dielectric substrate and a metal structure, and a waveguide cavity is arranged in the waveguide transmission line; the dielectric substrate is arranged in the waveguide cavity, and the dielectric substrate is perpendicular to the signal transmission direction of the waveguide transmission line; the metal structure is attached to the dielectric substrate to form an LC resonance circuit, and an electric adjusting element is arranged on the metal structure and used for adjusting the electric conduction shape of the metal structure so as to control the electromagnetic wave phase in the waveguide transmission line. According to the phase shifter of the scheme, the dielectric substrate is arranged in the waveguide transmission line, extra space is not needed, and the conductive metal shape of the metal structure is controlled by controlling the electrically tunable element, so that the phase change of electromagnetic waves after passing through the waveguide transmission line is controlled. According to the scheme, the dielectric substrate does not need to occupy extra space, the metal structure and the electric adjusting element are small in size, phase adjustment of electromagnetic waves can be achieved in an electric adjusting mode, and the method can be applied to scenes such as a high-power radar phased array.

Light-emitting diode (LED) devices and, more particularly, LED packages with individually adjustable pulse width modulation (PWM) signals and related methods are disclosed. LED devices, such as LED packages, with variable PWM signals include the ability to provide one or more of PWM phase control, PWM period count control, controllable blanking times, and intra-blanking signaling. LED packages are configured for receiving and transmitting digital communication signals. An integrated active electrical element within each LED package is configured to drive the LED chip by PWM while providing such variable PWM relative to other LED packages to more evenly distribute power draws and capacitance requirements in corresponding systems.

The embodiment of the invention provides a method and device for stably controlling an airplane in the auxiliary landing process, computer equipment and a medium, and the method comprises the following steps: judging whether the airplane is in a gliding stage, if so, activating a gliding stage control law, and if not, controlling the airplane to stably control the airplane through the gliding stage control law. The aircraft is controlled through the elevator centering instruction and the horizontal stabilizer automatic trimming instruction until the aircraft quits the gliding stage, and the gliding stage control law is quitted; if the aircraft enters the pull-up stage from the glide stage, activating the leveling stage control law, generating an elevator control instruction based on the steering column displacement and the steering column displacement nonlinear gain through the leveling stage control law, generating a rudder control instruction based on the pedal displacement signal and the pedal displacement nonlinear gain, and controlling the elevator control instruction and the rudder control instruction according to the pedal displacement signal and the pedal displacement nonlinear gain. And controlling the aircraft through the elevator control instruction and the rudder control instruction until the aircraft is grounded. According to the scheme, the landing quality and safety are improved through the staged aircraft auxiliary landing control law.

The invention discloses a low-sidelobe antenna based on double-metasurface amplitude and phase independent regulation and control. The antenna structure comprises a metasurface 1 and a metasurface 2. The metasurface 1 and the metasurface 2 comprise a plurality of metasurface units; the metasurface 1 is a phase modulation plane, comprises a phase regulation and control unit and is decoupled with the amplitude control function of the amplitude filtering plane; the metasurface 2 is an amplitude filtering plane and comprises an amplitude regulation and control unit, and the modulation process is decoupled from phase regulation and control of the metasurface 1; the phase regulation and control unit and the amplitude regulation and control unit comprise three metal layers and two dielectric layers; the first layer, the third layer and the fifth layer from bottom to top are metal layers, and the second layer and the fourth layer are dielectric layers. Through the design of the double-layer metasurface structure, completely independent operation of the phase regulation and control layer and the amplitude modulation layer is achieved, the technical contradiction that amplitude and phase parameters in a traditional single-layer metasurface are mutually restrained is avoided, and the core technical problem that the side lobe level of a transmission antenna is too high is solved cooperatively.

The invention belongs to the technical field of antennas, and particularly relates to an ultrathin full-space metasurface unit with dual-band amplitude-phase regulation and control and a multi-beam generator. In order to solve the problems that component design cost is high, unit amplitude is low, and incident wave energy cannot be efficiently regulated and controlled, the full-space metasurface unit comprises a first metal layer and a second metal layer, the first metal layer is located above the second metal layer, a dielectric plate is arranged between the first metal layer and the second metal layer, and the dielectric plate is located between the first metal layer and the second metal layer. A first C-shaped groove and a double split ring resonator are etched on the first metal layer from outside to inside in a hollowed-out manner, a second C-shaped groove and an elliptical groove are etched on the second metal layer from outside to inside in a hollowed-out manner, and the opening directions of the first C-shaped groove and the second C-shaped groove are perpendicular to each other. And the multi-beam generator is designed based on the total space metasurface unit.

The invention relates to a high-speed serial interface circuit, and discloses a linearity calibration and precision expansion method of a numerical control phase interpolator. According to the method, a digital delay converter (DDC) is cascaded behind a digital control phase interpolator (DPI), and delay compensation is carried out on an interpolated clock signal; sampling the compensated clock signal by using an analog-to-digital converter (ADC) to obtain a phase sampling value; the calibration control module calculates a phase error and generates a delay control word; when the numerical control phase interpolator DPI works, phase control words and delay control words are synchronously provided for corresponding modules, and linearity calibration and precision expansion are achieved. According to the method, a special detection circuit does not need to be added, hardware resources existing in a high-speed serial interface are utilized, the method can be achieved through simple digital control logic, the phase integral linearity is improved to be within 25 fs from 250 fs, meanwhile, the precision of an 8-bit phase interpolator is improved to be close to the 11-bit level, and the method is suitable for large-scale popularization and application. And the clock recovery performance and the data transmission reliability of the high-speed communication system are obviously improved.

The invention relates to a control method of a foam pipe foaming process in the technical field of production of new material foam pipes, which comprises the following steps: acquiring physical characteristic data of foam raw materials, including viscosity, density and foaming agent content, and establishing a raw material characteristic database; adjusting the phase difference between adjacent vibrators through a phase control algorithm according to density data in the raw material characteristic database, so that ultrasonic energy forms a uniform energy distribution field in the foam raw material; an optical sensor is used for monitoring the dispersion state of the foaming agent in real time, the frequency and power of an ultrasonic vibrator are dynamically adjusted according to the monitoring result, and if it is detected that local foaming is not uniform, power output of the vibrator in the corresponding area is increased; the bubble forming process is captured through a high-speed camera, bubble size distribution is analyzed through an image processing algorithm, and whether the bubble structure reaches preset standards including the average pore size, the pore size distribution range and the pore wall thickness or not is judged.

The invention discloses a terahertz phase shifter chip based on a magnetic coupling line fine adjustment technology, the magnetic coupling line fine adjustment technology is applied to a magnetic coupling line distributed attenuator, and a magnetic coupling line is added below a transmission line of the magnetic coupling line distributed attenuator. And a switching transistor array and a capacitive compensation transistor are respectively added at two ends of the magnetic coupling line. A vector synthesis type structure is adopted, the magnetic coupling line fine adjustment technology is innovatively provided and applied to the magnetic coupling line distributed attenuator, compared with a traditional distributed attenuator, the magnetic coupling line distributed attenuator has the advantages of being higher in precision and smaller in attenuation stepping, the occupied area is the same, the phase shifting control function of the phase shifter is achieved based on the attenuator, and the application range is wide. Finally, the phase of an output signal is controlled to realize a phase control function of 5.625-degree phase shift stepping in a full 360-degree range, and an amplitude control function in a 3dB range can be realized.

The invention relates to a reconfigurable intelligent metasurface which comprises a three-layer structure and comprises an artificial microstructure array with reflection and transmission in a specific frequency band range, an original phase shift structure is changed by controlling on-off of a semiconductor switch through external voltage, and finally phase control over reflection and transmission is achieved. Moreover, the structure is simple, can be realized through a micro-machining means, is mature in technology, and is easy to realize in high-frequency bands such as millimeter waves and terahertz.

The present application relates to the technical field of data processing. Disclosed are a multi-nuclear imaging radio frequency power amplifier and a multi-nuclear magnetic resonance imaging hardware system. The multi-nuclear imaging radio frequency power amplifier comprises: a radio frequency signal input end, a radio frequency switch, a pre-compensation circuit, a voltage-controlled attenuator, a voltage-controlled phase shifter, a broadband radio frequency power amplifier, a broadband directional coupler and a radio frequency signal output end; a first output abnormality protection control circuit; a second output abnormality protection control circuit; an amplitude control circuit; and a phase control circuit. By means of the multi-nuclear imaging radio frequency power amplifier in the present invention, nonlinear correction can be performed on the amplitude and phase of a broadband radio frequency power amplifier, such that the broadband radio frequency power amplifier keeps meeting the requirements for high linearity and high power at an operating frequency point of a corresponding nuclide, so as to ensure the linear relationship between input and output signals of a radio frequency power amplifier and adequate signal strength, thereby avoiding the generation of artifacts due to signal distortion, and ensuring the accuracy and clarity of magnetic resonance imaging.

A phase distributor in a phase controller of a multi-phase switching converter detects and corrects errors in the generation of phase control signals used for activating multiple phases. The phase distributor receives a common control signal having a transition type indicating time instances at which generated timing signals are to be asserted, with the assertions timing the state change of corresponding phase control signals. A first error condition is when multiple of the timing signals are asserted in a cycle of the common control signal. A first corrective action entails avoiding the first error condition in a first future duration following the error detection. A second error condition is when none of the timing signals is asserted when the transition type occurs on the common control signal. A second corrective action entails avoiding the second error condition in a second future duration following the error detection.

The invention discloses a terahertz metasurface capable of realizing independent control of amplitude and phase. The terahertz metasurface comprises a terahertz transparent substrate; the metasurface unit array is periodically arranged in a first direction, and each metasurface unit comprises a first structural layer which is of a dielectric resonance structure and is used for providing a phase regulation and control function; the second structural layer is a thin film formed by an adjustable absorption material and is used for providing an amplitude regulation and control function; the second structure layer is provided with an independent electrode for adjusting the transmission amplitude; a first dielectric isolation layer is arranged between the terahertz transparent substrate and the first structure layer and is used for reducing an electromagnetic coupling effect; the first structural layer and the second structural layer are stacked in the vertical direction through a three-dimensional processing technology, a second dielectric isolation layer is arranged between the first structural layer and the second structural layer, and the second dielectric isolation layer is a silicon dioxide SiO2 or silicon nitride Si3N4 film with the thickness D ranging from 100nm to 1000nm.

The present invention belongs to the field of electromagnetic functional devices, and specifically relates to a fin-line terahertz multi-phase shifter based on a gallium arsenide diode, comprising: a rectangular waveguide input port, a substrate, a rectangular waveguide-fin-line transition structure, a fin-line structure, a probe-type microstructure phase shifter unit, its feeding opening portion, a fin-line-rectangular waveguide transition structure, and a rectangular waveguide output port. The present invention addresses the problems of the existing terahertz wave phase modulator having few phase shifting technical solutions, large insertion loss during phase shifting, a small phase shift range, a large device size, and low integrability. By controlling the on-off of the diode on the probe-type microstructure phase shifter unit by voltage, the perturbation intensity of the probe on the fin line is changed, so that the equivalent dielectric constant of the fin line changes, thereby achieving the phase shift of the terahertz wave; then, by superimposing the phase shifters in a centrally symmetrical and parallel arrangement, a low-insertion-loss multi-bit terahertz wave phase shift is finally achieved, ensuring a good working state and promoting the development of terahertz phase control technology.

The invention discloses a digital measurement and control circuit of a resonant accelerometer based on an orthogonal phase-locked loop. Comprising an FPGA core board, an ADC / DAC board card and a gauge outfit analog interface board, and the high-precision resonant accelerometer is driven and detected through digital closed-loop control. The implementation method comprises the following steps: after capacitance / voltage conversion, modulation and demodulation and filtering, a resonator displacement signal is acquired by a high-precision ADC and input into an FPGA, a driving signal generated by the FPGA through an orthogonal phase-locked loop and an automatic gain control module is output through a DAC, and the driving signal is applied to a resonator driving end after shunt superposition of a direct current quantity. The digital quadrature phase-locked loop is adopted to replace a traditional phase-locked loop, the contradiction between dynamic response and noise suppression is solved, and the digital quadrature phase-locked loop has the advantages of being high in phase control precision, wide in capture bandwidth, high in anti-interference performance and excellent in compatibility.

A clock generator includes a phase controller configured to generate phase control information in response to comparing a phase of an input clock signal against a phase of a division clock signal, and an oscillator configured to generate a plurality of oscillation signals at an equivalent output frequency but different phases, in response to the phase control information and duty control information. A duty cycle converter is provided, which is configured to generate a plurality of output clock signals at the output frequency by adjusting duty cycles of the plurality of oscillation signals, such that the plurality of output clock signals have duty cycles smaller than the duty cycles of the plurality of oscillation signals. A clock divider is provided, which is configured to generate the division clock signal by dividing the output frequency of one of the plurality of output clock signals, such that the division clock signal has a division frequency smaller than the output frequency. A duty cycle calibrator is provided, which is configured to generate the duty control information for adjusting a duty cycle difference of the plurality of output clock signals, in response to detecting duty cycle differences between the plurality of output clock signals.

The invention discloses a current self-adaptive control system and device for electric vehicle charging, and relates to the technical field of electric vehicle charging control. According to the system, through a charging gun and a negative temperature coefficient thermistor array on a cable, temperature data of a preset weak part in an electric vehicle charging loop are collected; preliminarily estimating local resistance of each node based on local voltage drop and loop current data acquired by the paired differential voltage sampling points; the local resistance is corrected according to the temperature data to obtain a corrected resistance value, and after controlled current excitation of a preset time window is applied, the corrected resistance value is verified and corrected in combination with temperature response to obtain a corrected resistance value; and determining the maximum allowable current-carrying value of each sampling node based on the corrected resistance value, taking the minimum value as the maximum safe current-carrying limit of the charging loop, and adopting phase control and / or periodic on-off control within the maximum safe current-carrying limit to realize current-limiting management and control of the charging loop, thereby improving the safety and reliability of the charging process of the electric vehicle.

The invention discloses a fractional frequency division frequency synthesizer with output signal phase synchronization and frequency modulation continuous wave functions, and the basic structure is a charge pump phase-locked loop. Comprising a phase frequency detector, a first charge pump, a second charge pump, a low-pass filter, a voltage-controlled oscillator, a first buffer, a second buffer, a two-frequency divider chain, an IQ undersampling circuit, a local oscillator generator, a programmable multimode frequency divider, a Delta-Sigma modulator (DSM), a first selector, a second selector, a third selector, a tracking phase accumulator, a numerical control oscillator, an accumulation phase difference register and an atan2 logic circuit. The device comprises a main phase control circuit, a phase adjusting circuit, an enabling control circuit, a waveform generator and a serial peripheral interface. The decimal frequency-division frequency synthesizer can be applied to a general-inductance integrated system, ensures that output signals provided by a plurality of decimal frequency-division frequency synthesizers are consistent in phase in a multi-channel radio frequency transceiving system adopting a multi-chip splicing mode, and can also be applied to the general-inductance integrated system as a sensing signal source; and the speed and the distance of an object can be quickly sensed by the high linearity and the quick chirp capability of an output signal. The decimal frequency division frequency synthesizer is applied to a linear frequency modulation continuous wave radar system, initial phase synchronization can be carried out firstly, then frequency continuous modulation is carried out, and measurement errors can be eliminated. In view of functional similarity of partial modules of the synchronous loop and the FMCW loop, such as a phase frequency detector, a charge pump, a voltage-controlled oscillator and the like, the modules can be shared, so that the power consumption and area cost of the system are remarkably reduced.

The invention belongs to the technical field of power application, and aims to solve the problems that arc energy of an existing three-phase switch is difficult to accurately control and potential safety hazards exist when an electronic scheme is adopted. A split-phase independent control three-phase switch provided by the present invention comprises a switch body and three switch mechanisms, each switch mechanism comprises a shell, a handle, a linkage assembly, a moving contact assembly, a static contact, an arc extinguish chamber, a microswitch and a tripping assembly, the moving contact assembly and the arc extinguish chamber are both arranged in the closed shell, and the static contact assembly is arranged in the shell. The handle is connected with the moving contact assembly through the linkage assembly, the joint position of the moving contact assembly and the static contact is located in the arc extinguish chamber, and the linkage assembly is arranged to be capable of being connected with the microswitch when the moving contact assembly is connected with the static contact. The tripping assembly is set to enable the linkage assembly to drive the moving contact assembly to be separated from the static contact when the current reaches a set threshold value. The three-phase switch can accurately control arc energy, adopts a mechanical tripping mechanism to optimize a protection structure, and has no potential safety hazard.

The invention provides an industrial and commercial energy storage PCS power control method in the technical field of energy storage converters. The industrial and commercial energy storage PCS power control method comprises the steps that S1, an active power instruction PRef, a reactive power instruction QRef, a three-phase load current ILabc, a three-phase control current ILabc, a three-phase power grid voltage Ugabc and a direct-current bus voltage Udc are obtained; s2, calculating a d-axis component Ugd of the power grid voltage, a q-axis component Ugq of the power grid voltage and a power grid angle theta g; calculating a control current positive sequence d-axis component ICPd, a control current positive sequence q-axis component ICPq, a control current negative sequence d-axis component ICNd, a control current negative sequence q-axis component ICNq and a control current zero sequence component IC0; a step S3 of calculating ILNd, ILNq, IL0, IRRefPd, IRRefPq, IRRefNd, IRRefNq and IRRef0; a step S3 of calculating ILNd, ILNq, IL0, IRRefPd, IRRefPq, IRRefNd, IRRefNq and IRRef0; and S4, carrying out closed-loop control on the IRFPd, the IRFPq, the IRFNd, the IRFNq and the IRF0 to obtain SPWM (sinusoidal pulse width modulation), and controlling a three-phase bridge arm of the PCS based on the SPWM. The method has the advantages that the influence of load imbalance on a distribution transformer and a power grid is greatly reduced while conventional power scheduling is met.

The invention relates to a high-precision amplitude-phase control method and system for a multi-channel millimeter wave array power amplifier. The method comprises the steps that a first detection signal is sent to a coverage area, a first feedback signal based on the first detection signal is obtained, and a moving track of a tracking target is generated based on the first feedback signal; when the moving tracks of the two tracking targets coincide, a plurality of scanning position points are determined according to the relative positions of the two tracking targets; a second detection signal is sent to the overlapping area of the two tracking targets at the scanning position points, a second feedback signal based on the second detection signal is obtained, the second feedback signal obtained at each scanning position point is separated, and moving tracks of the two tracking targets are obtained. According to the high-precision amplitude-phase control method and system for the multi-channel millimeter wave array power amplifier disclosed by the invention, continuous tracking of two close-range targets is realized in a multi-position synchronous tracking and regional tracking mode.

The invention provides a welding and ultrasonic flaw detection synchronous operation device and method, and relates to the technical field of welding. The welding and ultrasonic flaw detection synchronous operation device comprises an electromagnetic eddy current generation module, a sound field regulation and control module, a magnetic-sound composite suspension unit, a distributed edge decision network and a defect in-situ repair module, and the electromagnetic eddy current generation module is composed of an annular array superconducting coil, a high-frequency power source with the output frequency of 1 kHz to 1 MHz and a programmable phase controller. And the phase controller can adjust the current phase difference between the adjacent coils to be 15-90 degrees. According to the technology, welding and nondestructive testing can be synchronized, the integration degree is high, the efficiency is greatly improved, real-time monitoring and in-situ accurate repairing of defects can be achieved, traditional reworking defects are avoided, technological parameters are adjusted in a self-adaptive mode through intelligent cooperative control, the state of a molten pool is optimized, non-contact machining is adopted, energy consumption and material waste are reduced, no toxic waste is discharged, and the method is suitable for industrial production. And the green manufacturing concept is met.

The invention discloses a split-phase anti-countercurrent control method and system for a three-phase inverter. The method comprises the following steps: acquiring output power, load power and grid-connected power of each phase of the three-phase inverter in real time; for each phase, calculating the difference between the load power and the output power, if the difference is less than or equal to 0, judging that the phase has countercurrent, and performing corresponding split-phase control; and if the difference is greater than 0, judging that the phase has a countercurrent trend, and carrying out corresponding split-phase control.