122 results about "Power modulation" patented technology

The invention relates to the technical field of power system planning, and discloses a new energy grid-connectable capacity margin evaluation method based on spatio-temporal distribution characteristics, which comprises the following steps: constructing a joint probability distribution model based on nonparametric kernel density estimation and a Copula function by using historical and meteorological data of a wind and light station, and generating a random output scene reflecting the spatio-temporal complementarity of wind and light resources; constructing a multi-dimensional stability constraint set containing a generalized short circuit ratio and broadband oscillation as a safety boundary of a random output scene; establishing a grid source interaction control strategy considering energy storage adjustment and direct current power modulation by taking grid-connected capacity maximization as a target, solving an optimal installed capacity scheme, and activating the grid source interaction control strategy to perform dynamic correction when a scene is out of limit; the maximum grid-connected capacity distribution meeting the constraint is counted, and the shadow price of the constraint is calculated to identify the bottleneck. According to the method, the wind and light resource complementary benefit and the system regulation potential can be quantified, and the new energy grid-connected capacity evaluation margin is improved on the premise of guaranteeing the safety.

The invention discloses a high-power and frequency-adjustable gyrotron loading test system for nuclear fusion, which relates to the technical field of nuclear fusion and comprises a 2-megawatt coaxial gyrotron with adjustable frequency of 170 / 240GHz and a loading test platform. The loading test platform comprises a gyrotron part loading system, a strong magnet system, a vacuumizing system, a power supply system, a load system, a cooling system, a monitoring and diagnosing system and a control system. The component loading system is used for precise assembly; the strong magnet system provides an adjustable strong magnetic field; the vacuumizing system maintains ultrahigh vacuum; the power supply system comprises a cathode power supply and a body power supply, and the body power supply is used as a high-voltage amplifier to realize 10kHz rapid power modulation; the cooling system provides independent active cooling; the load system simulates a real load; comprehensive detection of the monitoring and diagnosis system; and the control system realizes coordinated control and rapid protection. According to the invention, a complete solution is provided for development, test, operation and maintenance of the 2-megawatt-level and frequency-adjustable gyrotron.

The invention discloses a power modulation method and system for an all-solid-state power supply, and belongs to the technical field of pulse power. The method comprises the following steps: converting a target waveform into a multi-level discrete waveform, and segmenting the multi-level discrete waveform into a plurality of continuous sub-waveforms according to polarity; for each sub-waveform, identifying all level switching moments, obtaining a time-level number corresponding relation, and generating a corresponding switching action time sequence matrix; the row index of the switching action time sequence matrix corresponds to the level number, the odd-numbered columns store the turn-on time parameters of the switching devices under the corresponding level number, and the even-numbered columns store the turn-off time parameters of the corresponding switching devices; and converting the switching action time sequence matrix into period counting based on an FPGA main clock, and generating a corresponding driving pulse signal by the FPGA according to time sequence data so as to control a switching device in the all-solid-state power supply and carry out power modulation. High-real-time and high-precision control on the switch of the solid-state power supply is realized, and the effect of arbitrary waveform power modulation is realized.

The utility model discloses a multipath output protection control power supply device, which comprises a power supply modulation module, a plurality of output modules and a plurality of over-current self-locking protection modules, the plurality of output modules are connected in parallel, each output module at least comprises a switch unit, and the over-current self-locking protection modules are connected in parallel. The head end of each switch unit is connected with the output end of the power supply modulation module, the tail end of each switch unit is used for being connected with a corresponding load, the controlled end of each switch unit is used for being connected with a control module, and each overcurrent self-locking protection module is connected with the output module in a one-to-one correspondence mode. The sampling end of the overcurrent self-locking protection module is connected with the corresponding output module to sample the working current, the control end of the overcurrent self-locking protection module is connected with the controlled end of the corresponding switch unit to drive the switch unit to be disconnected when the working current exceeds a current threshold value, and the design is convenient to use, safe and reliable.

The invention discloses a cutting machine motor intelligent temperature management method and system based on load prediction, relates to the technical field of cutting machine motor temperature management, and is used for solving the problems of temperature response lag and local overheating under the conditions of complex tracks and load fluctuation. In the operation process of the cutting machine, three-phase stator side current signals of the motor are continuously captured, a current vector input quantity is obtained through coordinate transformation and input into the sliding mode observer to estimate the rotor position and the motor rotating speed, a load trend quantity is generated, combined compensation modulation is carried out, and a compensation value is output to a power output link to dynamically adjust the duty ratio. According to path analysis, marking a hot stacking sensitive path section, calculating a power output change rate and shielding wind flow disturbance intensity, screening out a thermal response to-be-detected section, collecting data through a thermosensitive channel to construct a regional thermal risk index, executing differential air cooling adjustment and power modulation path adjustment, and recording state data in real time; and fine management of the full-working-condition temperature of the motor of the cutting machine is realized.

The invention discloses a power modulation method, system and device for an isolated single-phase DC-AC converter and a medium, and the method comprises the steps: firstly, carrying out the sampling of input and output voltage and current, and obtaining the size of transmission power; then determining the soft switching current of the primary and secondary side switching tubes; determining inner and outer phase shift angles according to the soft switching threshold current; calculating a switching frequency based on the transmission power; determining dead zone time of a primary side bridge arm and a secondary side bridge arm according to the phase shift angle, the switching frequency and a soft switching constraint condition; and finally generating a PWM driving signal. According to the invention, ZVS soft switching of all switching tubes on the DC side and the AC side can be realized, loss caused by operation of the switching tubes in the fourth quadrant in the dead zone time is optimized, the working operation efficiency of the converter is improved, the power control strategy is simple, and the method has high practical application value.

The invention relates to a thermoacoustic machine (1) comprising a control device (14) configured to modulate the acoustic power generated by one or more acoustic sources (6-9) so that the temperature of an external source (2) connected to one or more thermoacoustic cells (10-13) of the machine (1) reaches or remains substantially the same as a setpoint temperature. Figure for the abstract: Fig. 1

The application provides a pulse current generation circuit, a low-noise frequency reducer and a satellite receiver. The circuit comprises a pulse generation module, a current generation module and a current mirror module, the current generation module is electrically connected with the pulse generation module and the current mirror module, and the current mirror module is used for being electrically connected with an output end of an LDO in the low-noise frequency reducer. The pulse generation module receives a square wave signal and outputs a first pulse voltage at a falling edge of the square wave signal, and the current generation module generates a first current according to the first pulse voltage; the current mirror module outputs a pulse current according to the first current, and the pulse current is a pull-down current connected to the output end of the LDO. The pulse current generation circuit of the application generates and outputs the pull-down pulse current only in the period when the modulation wave needs to drop, effectively reduces the invalid current loss in the period when no demand is required, greatly reduces the average power consumption in the LNB power modulation process, and greatly improves the power conversion efficiency during the LNB power modulation.

The invention relates to the field of laser welding quality detection, in particular to a multi-modal fusion identification method and system for laser welding defects of copper-aluminum heterogeneous materials. Molten pool images, temperature fields and acoustic emission signals are synchronously collected through a visible light high-speed camera, a thermal infrared imager and an acoustic emission sensor which are coaxially integrated; the width oscillation amplitude, the trailing edge solidification angle, the interface temperature gradient, the acoustic emission characteristic frequency band energy ratio and the burst signal counting rate of the molten pool are extracted; constructing a fusion vector input adaptive weighted deep neural network model, and identifying four types of defects of pores, cracks, incomplete fusion and interface brittle compound layer standard exceeding in real time; and the identification result triggers laser power modulation or protective gas proportion adjustment. The problems that in the prior art, multi-physical field perception is insufficient, the feature adaptability of heterogeneous materials is poor, and real-time control is lack are solved, the defect detection rate reaches 98.2%, and control response delay lt is achieved; and 50ms.

The application relates to the technical field of electronic information security, and discloses a medium-frequency processing module cooperative detection system based on power modulation, which comprises a signal acquisition layer, a network transmission layer and an analysis processing layer. The signal acquisition layer realizes full-band electromagnetic signal acquisition, power spectrum reconstruction and interference suppression; the network transmission layer realizes multi-node data synchronization and cross-space cooperative interaction; and the analysis processing layer is based on a multi-dimensional mapping electromagnetic signal feature model and an integrated learning algorithm to complete abnormal signal positioning, multi-source interference suppression and wireless transmission behavior discrimination. Through the cooperation of multiple layers of technology, the system solves the problems of low detection precision and insufficient anti-interference capability of the medium-frequency processing module in a complex electromagnetic environment, has the advantages of full-band coverage, real-time cooperative processing, intelligent analysis and decision-making, and can be widely applied to the field of information security protection to improve the detection and suppression capability of radio frequency transmission and reception behavior.

The application discloses a power modulation method and system of a full solid-state power supply, and belongs to the technical field of pulse power. The method comprises the following steps: converting a target waveform into a multi-level discrete waveform, and dividing the multi-level discrete waveform into a plurality of continuous sub-waveforms according to polarity; for each sub-waveform, identifying all level switching moments to obtain a time-level number corresponding relationship, and generating a corresponding switch action time sequence matrix; the row index of the switch action time sequence matrix corresponds to the level number, and the odd columns store the turn-on time parameters of the corresponding switch devices under the corresponding level number, and the even columns store the turn-off time parameters of the corresponding switch devices; the switch action time sequence matrix is converted into period counting based on the main clock of the FPGA, and the FPGA generates corresponding driving pulse signals according to the time sequence data, so as to control the switch devices in the full solid-state power supply and perform power modulation. The switch of the solid-state power supply is controlled with high real-time performance and high precision, and the effect of arbitrary waveform power modulation is realized.

The invention relates to a heating device (100) with a heating power (L) that is variable within a power modulation range, wherein the power modulation range includes values ​​from a predefinable minimum power (L). MIN ) up to a rated power (L MAXThe method comprises the steps of providing a burner (200) for generating the heating power (L) by burning a fuel-air mixture flow (AB) while producing at least one flame (F), and providing an optical monitoring device (300) for generating a measured value (M) corresponding to the optical radiation (S) of the flame (F). During heating operation of the heating device (100), the measured value (M) of the optical monitoring device (300) is compared with a limit value (G) in a first comparison, in particular by means of a control device (400), and the presence of a flame (F) is determined based on the result of this first comparison. It is proposed to define a value for the minimum power (L). MIN ), in particular by means of the control unit (400), to adjust if no flame (F) is detected in the heating operation or if the measured value (M) is detected to be in a tolerance range just above the limit value (G).

The application provides a joint coding image transmission method, device and equipment and a storage medium. By increasing the sending of original bit information and reducing the sending of check bit information, lossless transmission of images is realized by using double LDPC joint coding without increasing redundancy. Meanwhile, low-frequency information is considered as the increased original bit information, unequal power modulation is used by taking the non-equivalent characteristics of the low-frequency information into account, and unequal protection is realized by using corresponding redundancy information at the decoding end, so that performance gain is realized.

The invention discloses a single-stage bidirectional DC-AC converter minimum current stress optimization method, system and device and a medium, and belongs to the technical field of power electronic converter control, and the method comprises the steps: building an operation mechanism comprising four effective working modes based on the single-stage bidirectional DC-AC converter through a frequency conversion phase shift control strategy and aiming at bidirectional energy transmission demands, the inverter and the rectifier respectively correspond to inversion and rectification modes under different relations of input and output voltages. Taking the minimum current stress as a target function, solving the optimal shift ratio by combining the transmission power constraint and the soft switching condition, and calculating the real-time switching frequency by adopting equal power modulation. Frequency conversion control is introduced on the basis of phase shift control, power factor correction and soft switching constraint can be achieved at the same time, the optimal phase shift ratio and the switching frequency are directly solved through an analytical expression, and the calculation complexity of a traditional iterative algorithm is avoided.

The present invention relates to the field of additive manufacturing, and more specifically to an SLA and DLP hybrid process additive manufacturing splicing method, comprising the following steps: S1: reading a test slice image and performing power modulation on a DLP optical projection system and an SLA galvanometer scanning system; S2: judging whether the curing depths of the DLP optical projection system and the SLA galvanometer scanning system are consistent, and adjusting the powers of the DLP optical projection system and the SLA galvanometer scanning system; S3: dividing a DLP projection working area and an SLA scanning working area; S4: calculating, based on the DLP projection working area and the SLA scanning working area, a DLP projection splicing overlap area and a DLP and SLA curing boundary splicing overlap area; S5: planning a DLP and SLA hybrid process forming path based on the DLP projection working area, the SLA scanning working area, the DLP projection splicing overlap area, and the DLP and SLA curing boundary splicing overlap area; and S6: the DLP optical projection system projects according to the process forming path, and the SLA galvanometer scanning system scans according to the process forming path.

The invention discloses a self-adaptive power control method for a multi-working-condition resistance type heating device, and relates to the technical field of automatic control, and the method comprises the steps: 1, collecting a three-phase instantaneous voltage sampling value sequence and an instantaneous current sampling value sequence through a high-frequency synchronous sampling array, therefore, a dynamic impedance topological distortion model of the three-phase unbalanced load is constructed; 2, importing a load distortion guide vector and a total power demand radius into a vector orthogonal projection interception algorithm based on a virtual rotating coordinate system to realize generation of an active and reactive power separation control instruction; and step 3, generating a dynamically optimized asymmetric trigger phase sequence and implementing active modulation and reactive correction to enable the resistance-type heating device to realize adaptive power control under multiple working conditions. Accurate power output and current balance can be continuously kept in the load changing and working condition switching process, and the response speed, the energy efficiency level and the power grid side operation stability of the resistance type heating device are remarkably improved.

This invention proposes a power modulation system, comprising: a rectifier unit having a first input terminal, a second input terminal, a first output terminal, and a second output terminal, wherein the first input terminal and the second input terminal are connected to an AC power grid, and the rectifier unit is used to convert AC power into DC power; a power factor correction unit connected in parallel between the first output terminal and the second output terminal; the power modulation system further includes a filter unit having a third capacitor element and a switching element, and connected in parallel between the first output terminal and the second output terminal. The power modulation system proposed in this invention effectively improves the power factor when the brushless motor is running at high speed, and ensures output torque and reduces motor copper losses when the brushless motor is running at low speed.

A power supply modulator circuit includes a multi-output power supply that generates multiple power output signals; at least one power modulator circuit generates a modulated power output signal from the multiple power output signals of the multi-output power supply; at least one pulse shaping network (PSN) having at least one passive element, the PSN configured to shape the modulated power output signal; at least one power amplifier coupled to receive the modulated power signal; and a switching network having a plurality of switches to create or modify power signal paths from the at least one power modulator circuit to the at least one power amplifier.

The invention relates to the field of photovoltaic grid-connected management and control, in particular to an intelligent grid-connected management and control method and platform for a photovoltaic power station, and the method comprises the following steps: collecting the operation information of a target photovoltaic power station, carrying out the transient analysis, and constructing a transient operation state set; performing continuous time tracking on the transient operation state set to generate a photovoltaic evolution track; performing comprehensive change frequency analysis on the photovoltaic evolution track to obtain a change frequency matrix; synchronously acquiring operation parameters of a power grid side; performing grid-connected risk assessment on a change frequency matrix according to the power grid side operation parameters, and generating a grid-connected risk assessment value; grid-connected risk assessment is carried out based on the grid-connected risk assessment value, and when it is judged that the target photovoltaic power station meets the direct grid-connected condition, synchronous grid-connected processing is executed; when it is judged that the target photovoltaic power station does not meet the direct grid connection condition, grid connection power modulation is carried out, and intelligent grid connection management and control processing is completed. According to the invention, the safety and stability of photovoltaic power station grid connection are effectively improved.

The invention discloses an atomic optical frequency standard rapid self-locking system, which comprises a clock laser, and the output of the clock laser is divided into a first path of modulation laser and a second path of modulation laser after sequentially passing through an ultra-stable cavity system, a frequency power modulation optical system and a first spectroscope. The spectral data acquisition system acquires spectral data generated when a first path of modulation laser enters the atomic system physical system, the spectral data acquisition system is respectively connected with the servo feedback system and the integrated automatic control system, and the servo feedback system is connected with the frequency power modulation optical system; the output of the femtosecond optical comb and three paths of modulation laser divided from the second path of modulation laser are subjected to beat frequency to generate beat frequency signals which enter the photoelectric detector; and the laser, the ultra-stable cavity system, the frequency power modulation optical system, the laser frequency scanning system, the atomic system physical system and the femtosecond optical comb are respectively connected with the integrated automatic control system. The invention further discloses a rapid self-locking method for the atomic optical frequency standard, and rapid locking of the optical frequency standard is achieved.

The application provides a radar large target simulation system and method based on real-time dynamic convolution, wherein the system is controlled by a master control unit; the master control unit is used for completing the control of a work flow and a mode, the configuration and issuing of parameters, the receiving and display of a work state, the display and analysis of waveform data, the issuing and management of a playback file, and has the ability of receiving remote control; a medium frequency unit is used for completing the analog-digital conversion of a channel signal and the modulation of a target echo signal; a micro wave unit is connected with the medium frequency unit and is used for completing the up-conversion and down-conversion of a radio frequency signal, power modulation and detection output functions. The application can complete the echo simulation of a large body target by only performing real-time dynamic convolution on the target characteristics in the radial distance dimension, and can be completed by consuming a small amount of FPGA multiplier resources. The strong scattering points are divided according to the radial distance dimension, and the convolution position is flexibly adjusted, so as to reduce the actual convolution point number and save the multiplier resources.

The invention discloses a laser power modulation method based on a flying light path of 2D galvanometer synchronous processing equipment, and the method comprises the following steps: placing cloth, testing the actual laser power of a machine table at different coordinate positions in an XY stroke range, and setting a power coefficient corresponding to each coordinate position; the material distribution workpiece is placed again and flatly laid on the machine table, and it is guaranteed that the workpiece is accurately positioned; a machining program is started, the machine table drives the galvanometer to cut the outline of the scarf according to a preset track, and power is modulated according to a set power coefficient; after machining is completed, XY axial movement is conducted to a preset safety position; and the machined workpiece is taken down from the machine table, and the machining process is completed. According to the invention, the problem of weak processing energy of the far end of the flight light path is solved.

A frequency and power modulation radio frequency (RF) generator includes a first frequency and power modulation RF generator including a signal generator configured to generate an RF signal, an amplifier configured to amplify power of the RF signal from the signal generator, and a phase controlled power correction (PCPC) circuit configured to control a phase of the RF signal amplified by the amplifier. The signal generator, the amplifier, and the PCPC circuit are controlled to perform multi-level pulsing and frequency modulation on the RF signal, thereby supplying RF power of the RF signal to a chamber. The multi-level pulsing has pulse forms with different power levels.

A power supply device and its power modulation method are disclosed. The power supply device includes multiple parallel power channels. According to the power modulation method, the duty cycle of each pulse width modulation (PWM) signal is reset to zero near the zero-crossing point of the input voltage, and after a set period, the duty cycle of each power channel is restored based on the changed PWM signals of each power channel. The power supply device and its power modulation method provided by this invention perform channel switching near the zero-crossing point of the input voltage, which can ensure the stability of the input current after switching, improve the overall power factor of the power supply device, and increase the utilization rate of the power grid.

The application discloses an automatic gear shifting stroke self-adaptive adjusting device and an automatic transmission, and relates to the technical field of vehicle automatic transmission. The device comprises a power modulation component and a motion execution component, and the motion execution component is arranged on one side of the outer wall of the power modulation component. The power modulation component comprises a brushless direct current motor, a sun gear, three planetary gears, a planet carrier and a ring gear. The brushless direct current motor is used for providing constant basic torque required for driving the synchronizer to engage and separate. The sun gear, the three planetary gears, the planet carrier and the ring gear form a complete planetary differential assembly. Through the cooperative linkage of the power modulation component and the motion execution component, the core defects of the traditional automatic gear shifting adjusting device, such as discontinuous grading control, power regulation function coupling, poor anti-vibration stability, complicated assembly and maintenance, and weak working condition adaptability, are accurately solved, and the core requirements of high-precision stepless regulation, high smoothness and low impact, strong working condition adaptability and long service life and low operation and maintenance in the field of vehicle automatic transmission are fully met.

This invention provides a method for fast laser wavelength locking and power modulation based on feedforward compensation, relating to the technical field of laser wavelength modulation technology. The method includes: parallel monitoring of laser state information; generating a compensation signal based on the state information; fusing and allocating the compensation signal to obtain a composite control signal; and adjusting the laser wavelength based on the composite control signal. This invention solves the problem of low laser modulation accuracy, thereby improving laser modulation accuracy.

A frequency and power modulation radio frequency (RF) generator includes a first frequency and power modulation RF generator including a signal generator configured to generate an RF signal, an amplifier configured to amplify power of the RF signal from the signal generator, and a phase controlled power correction (PCPC) circuit configured to control a phase of the RF signal amplified by the amplifier. The signal generator, the amplifier, and the PCPC circuit are controlled to perform multi-level pulsing and frequency modulation on the RF signal, thereby supplying RF power of the RF signal to a chamber. The multi-level pulsing has pulse forms with different power levels.

An interferometer system includes an optics system configured to allow a first light beam to travel along a measurement path including a target, and a second light beam to travel along a fixed reference path excluding the target; and a signal generator configured to introduce a power-modulated optical signal in the measurement path or the reference path to determine jitter caused by components of the interferometer system downstream of the signal generator.

The application relates to the technical field of power modulation circuits, in particular to a high-voltage pre-modulation circuit applied to a wide LDO input, which comprises a main switch tube, a first transient response circuit and a second transient response circuit; when the modulation power voltage jumps from low to high, the first transient response circuit is turned on to reduce the modulation power voltage; when the modulation power voltage jumps from high to low, the second transient response circuit outputs a bias current to a main switch tube control module of the main switch tube to increase the current flowing through the main switch tube of the power supply circuit. The beneficial effect is that the first transient response circuit and the second transient response circuit are configured, and different trigger conditions are set. When the voltage of the power supply circuit in the front stage jumps to high voltage or low voltage, the current flowing through the main switch tube and the output node can be discharged or increased in time through the first transient response circuit or the second transient response circuit, so that the output voltage approaches the target value, and a faster response speed is realized.