41 results about "Type frequency" patented technology

The utility model discloses a kind of internal electronic device partition installation type frequency converters, its shell is separated into left side chamber, middle air duct and right side chamber by left, right partition, left side chamber sets up rectifier module group and direct current contactor, right side chamber sets up drive board and IGBT module group, air duct installs radiator, capacitor group transversely penetrates air duct and is fixed between left, right side partition, realize that rectifier module group and IGBT module group share radiator;Shell top is equipped with protective piece and receives control panel, inlet group external fan group brings in airflow and carries away heat.The utility model concentrates high heating element in air duct both sides by partition installation, utilizes shared radiator and fan group to realize high-efficiency heat dissipation, avoid heat interference;Control panel is independently laid in top protective piece, and optimization space utilization rate;The utility model is in guaranteeing heat dissipation performance, through structure optimization makes overall layout compact, reduce the volume of frequency converter, it is favorable to reduce cost.

The utility model discloses a modularized dislocation type frequency conversion cabinet, the back side of a cabinet body is provided with a back plate which can fully seal an opening at the back side of the cabinet body, the cabinet body is internally provided with a vertical partition plate which divides the cabinet body into a front cavity and a rear cavity, and the vertical partition plate and the cabinet body are integrally formed. The cavity close to one side of the cabinet door is a switch cavity, and the cavity close to one side of the back plate is a staggered mounting cavity; the staggered quick-release assembly is detachably arranged in the staggered mounting cavity, the quick-release assembly comprises staggered transverse partition plates and staggered longitudinal partition plates, the staggered transverse partition plates are detachably connected with the cabinet body, and the staggered longitudinal partition plates are detachably arranged between the two staggered transverse partition plates; the corresponding frequency converters can be arranged on different mounting plates through the detachable staggered transverse partition plates and the staggered longitudinal partition plates, and when the frequency converters are used for the second time, the corresponding connecting lines of the frequency converters can be directly disassembled, and then the staggered longitudinal partition plates can be directly disassembled, so that complete disassembly can be realized; and the traditional method that the fixing bolts can be taken out after being completely detached is avoided.

The invention belongs to the technical field of power system control, and the method comprises the following steps: improving a manual failure area unit of primary frequency modulation, when a frequency deviation delta F'exceeds a frequency dead zone Ef, increasing a superposition amount for the calculated frequency deviation delta F, and when primary frequency modulation action is carried out, adding a delay filtering link; optimization is carried out on the superposition amount and the delay link for adaptive adjustment, and prediction and multi-stage frequency modulation are carried out during a primary frequency modulation action; and when the primary frequency is reset, a return difference link is added. According to the method, the algorithm of the manual failure area is improved, a step-type frequency superposition amount is added to the calculated frequency difference, and the adjustment amount of frequency modulation is increased, so that the problem of insufficient integration of frequency modulation is overcome; when the frequency deviation is weak, a step type is added to form a larger output signal, the signal output form is a sudden change form, and the dead zone of each link is overcome; time delay and return difference are increased, and frequent jitter which is useless for primary frequency modulation and is caused by frequency crossing of a frequency dead zone edge of a power grid system is prevented.

The invention discloses a cascade frequency selective surface with a steep transition band and a wide passband. The cascade frequency selective surface sequentially comprises a frequency selective surface with a steep sideband, a honeycomb core layer and a frequency selective surface with a wide passband from top to bottom along a Z-axis direction, the frequency selective surface with the steep sideband is used for providing a frequency response characteristic of rapid roll-off at the edge of a passband to form a steep transition band; the frequency selective surface with the wide passband is used for providing a broadband wave-transparent characteristic and a broadband stop-band suppression characteristic; the honeycomb core layer is used for cascading a frequency selective surface with a steep sideband and a frequency selective surface with a wide passband; and electromagnetic coupling between the upper and lower layers of frequency selection surfaces is reduced, so that the frequency selection surface with a steep sideband and the frequency selection surface with a wide passband maintain relatively independent resonance characteristics. According to the invention, the square annular patch with central symmetry is used, and the four branches are added, so that the symmetry enables the angle to be stable, and the processing complexity is simplified.

The utility model discloses a three-axis drive frequency converter, an air conditioner electric control box and air conditioning equipment, relates to the technical field of power electronics, is used for providing a frequency conversion control function, and provides the three-axis drive frequency converter aiming at the problems caused by the scheme that three split-type frequency converters are adopted for a compressor, a fan and a water pump at present. Three original split-type frequency converters corresponding to a compressor, a fan and a water pump in the air conditioning equipment are achieved through a one-to-one single-shaft frequency conversion module and a one-to-two double-shaft frequency conversion module, and the single-shaft frequency conversion module and the double-shaft frequency conversion module are integrated on the same mainboard. Three motor devices can be simultaneously controlled to operate through one circuit board. According to the scheme, the problem that the overall size is increased due to a split-type frequency converter is solved, connecting wire harnesses between the frequency converters are reduced, the material cost of air conditioning equipment can be controlled, and the overall production efficiency can be improved.

The utility model discloses a cabinet type frequency converter replacement tool, which relates to the technical field of tools, and comprises a plane steel plate, one side of the plane steel plate is provided with an inclined plane steel plate, four corners of the bottom of the plane steel plate are provided with mounting cylinders, the inner parts of the mounting cylinders are provided with adjusting seats in an inserting manner, the inner walls of the mounting cylinders are provided with internal threads, and the adjusting seats are provided with external threads. And external threads are arranged on the outer walls of the adjusting seats. The beneficial effects are that the plane steel plate and the inclined surface steel plate form a complete slideway steel plate, and the surfaces of the plane steel plate and the inclined surface steel plate are not provided with any groove, so that the frequency converter can smoothly move to the plane steel plate from the cabinet body, then move to the inclined surface steel plate from the plane steel plate, and finally move to the ground from the inclined surface steel plate; according to the utility model, the whole process is free from jamming, the time for replacing the frequency converter is shortened, the working efficiency is improved, the time-saving and labor-saving effects are realized, and the practical applicability is better.

The application provides a driving fault feedback method and a feedback system. The method first determines frequency segments corresponding to different fault types; then feedbacks a detected fault level signal for logical processing; evaluates fault priority, changes the fault level signal to a low level according to the priority, changes the low level to a high level after a plurality of counting points, takes the high level as an initial value, and continuously outputs frequency signals corresponding to different fault types; finally collects the frequency signals, counts values between two rising edges, and determines a fault type according to the obtained counting values and the fault type frequency segments. The method uses a single channel to feedback fault information, transfers fault information according to feedback pulse frequency, and different frequency bands represent different faults, so that different fault types can be distinguished. By setting a wide fault frequency band and a frequency interval zone, the influence of interference can be greatly reduced.

The invention discloses a frequency mixing regulation and control method and device based on a four-bridge-arm type frequency mixing solid-state transformer. The method comprises the following steps: respectively calculating modulation signals of four sub-bridge arms in the solid-state transformer; performing quantization processing on the modulation signals of the four sub-bridge arms by using nearest level approximation modulation to generate step waves, and determining the number of basic sub-modules put into use in each sub-bridge arm according to the voltage amplitude of the step waves; in the control period, if the step waves change, the corresponding sub-bridge arms are controlled; in the control period, if the voltage imbalance value is larger than the corresponding threshold value, the N sub-modules in the sub-bridge arm are put into use, and N is the number of the basic sub-modules. According to the technical scheme, control is performed only when step waves change, so that the switching action times of the sub-modules are remarkably reduced, and the switching frequency is reduced; only when the voltage imbalance value is too high, forced sequencing control is carried out on sub-module switches in the sub-bridge arms, the switching frequency is reduced, and the switching loss is reduced.

A communication method comprises: determining, by a first communication device, whether to transmit a first measurement report based on a first condition in response to a first-type frequency point meeting a first reporting condition.

The utility model relates to the field of frequency converters, in particular to a high-sealing vector type frequency converter. The frequency converter comprises: a housing; the positive pressure ventilation structure comprises an air supply structure mounted at the bottom of the shell and heat dissipation holes formed in the top of the shell; the air supply structure comprises an air pipe joint mounted at the bottom of the shell, an external air source communicated with the air pipe joint, and filter cotton mounted at the end part of the air pipe joint; blocking pieces capable of being turned over upwards are arranged at the heat dissipation holes, and the blocking pieces are configured to be turned over when air flow penetrates through the heat dissipation holes to flow upwards and seal the heat dissipation holes when the air flow stops flowing upwards. The high-sealing vector-type frequency converter has two effects of heat dissipation and dust prevention, external dust can be prevented from entering the frequency converter along with airflow, the heat dissipation effect of the frequency converter is ensured, and the service life of the frequency converter is prolonged.

A communication method, a communication device, an apparatus, and a storage medium are provided. The communication method comprises: a terminal device receives configuration information of a network device, the configuration information being used for configuring a first-type frequency unit and / or one or more second-type frequency units.

A frequency converter and a container-type frequency conversion skid. The frequency converter comprises a container body (10), wherein a first mounting area (110) and a second mounting area (120) are formed inside the container body (10), the first mounting area (110) is located below the second mounting area (120), a first opening (130) is formed at a first end side of the container body (10), and the first opening (130) is communicated with the first mounting area (110); a frequency conversion module (300) arranged in the first mounting area (110); a fan module (200) arranged in the second mounting area (120); a mounting frame (700) arranged at a first end side of the first mounting area (110), wherein a second opening (710) is formed in the mounting frame (700), and the first opening (130) is communicated with the second opening (710); a cold conduction module (400) comprising a cold conduction plate (410), wherein the cold conduction plate (410) is arranged on the side of the mounting frame (700) facing away from the first mounting area (110). The cold conduction plate (410) is arranged at an end side of the frequency converter (20), thereby preventing the cold conduction plate (410) from occupying the space in the container, and facilitating maintenance of electrical components.

The application discloses a Ku / Ka dual-frequency shared automatic portable communication antenna and belongs to the technical field of antennas, which comprises a feed source, an antenna reflecting surface, a microwave network, an antenna seat frame, a supporting leg and the like. The application adopts a Ku / Ka integrated feed source, a microwave network and an antenna reflecting surface, and frequency band switching is realized through a dial lever type frequency band switching switch, so that the operation is simple and efficient. The high-precision split antenna surface is adopted, the split surface panels have high consistency, the panel interchanging can be realized, the positioning is realized through a pressing plate, the lock catch is locked, and the rapid assembly can be realized. The antenna seat frame adopts a novel integrated transmission mechanism, the transmission mechanism has the characteristics of small size and light weight, space is left out to realize the integrated design of the antenna seat frame and a terminal, and the antenna appearance design implements the industrial design concept and the hidden cable design, and the modeling is beautiful.

The application discloses a kind of multi-objective mathematical calculation model construction method and application system, it is related to mathematical modeling technical field, including the following steps: S1, real-time data acquisition;S2, data preprocessing;S3, dynamic weight adjustment;S4, model construction and solution.The multi-objective mathematical calculation model construction method and application system, through the dynamic frequency mechanism of basic frequency and trigger type frequency increase, according to the parameter fluctuation characteristics flexible adjustment acquisition strategy, avoid the key fluctuation information missing caused by fixed low-frequency acquisition, reduce the resource waste caused by fixed high-frequency acquisition, different change characteristics parameters can be realized efficient data capture, and rely on the linkage mechanism of real-time data acquisition and dynamic weight adjustment, can quickly respond to parameter change, combined with efficient model solution architecture, substantially shorten the period from parameter change to output optimal decision scheme, effectively avoid the decision lag problem of traditional fixed weight model.

The invention discloses a method and device for calculating the maximum output voltage of a two-level voltage type frequency converter, and the method comprises the steps: forming an equilateral triangle according to the straight lines where two basic voltage vectors are located and the vertexes in a sector where a space electrical angle is located, calculating the length of a vertical line perpendicular to the third side of the equilateral triangle from the central point of the space voltage vector distribution diagram; mapping the difference between the working durations of the two basic voltage vectors to the third edge; taking the vertical line as a right-angle side, taking the difference between the working durations of the two basic voltage vectors on the third side as the other right-angle side, calculating the lengths of bevel edges corresponding to the two right-angle sides by adopting a preset optimal gradient method, and taking the lengths of the bevel edges as the maximum output voltage of the frequency converter; according to the optimal gradient method, the hypotenuse of the triangle is calculated by using two right-angle sides through a dichotomy and an error feedback updating mode. The maximum output voltage of the two-level voltage type frequency converter can be quickly and accurately calculated, and the calculation efficiency is improved.

This invention discloses an intelligent control method and system for the construction quality of UHPC wet joints, specifically relating to the field of automatic control technology for construction processes. It addresses the problem of inaccurate control caused by environmental vibration interference in existing wet joint construction. The method involves collecting vibration signals from multiple preset locations on the wet joint structure, extracting first-type frequency domain features related to construction operations and second-type frequency domain features related to environmental disturbances, identifying vibration types based on feature energy distribution and transient characteristics, analyzing the attenuation gradient of energy values ​​with distance when identified as construction vibration to assess structural coupling, evaluating the concentration of the first-type frequency domain features based on structural coupling to assess construction vibration stability, adjusting the control parameters of the vibration equipment, and finally executing the adjusted control parameters to control the vibration operation, thereby achieving intelligent control of the construction quality of wet joints.

The invention discloses a frequency conversion control system based on load optimization, which belongs to the technical field of motor control, and comprises a frequency converter, the output end of the frequency converter is connected with an output cable, the length of the output cable is not more than 100 meters, the frequency converter is a three-phase voltage type frequency converter, an insulated gate bipolar transistor is adopted as a power switch device, and the power switch device is connected with the output cable. The output end is connected with the motor through an output cable. And the filtering assembly is connected to an output cable of the frequency converter and comprises a plurality of filtering bands, and each filtering band is used for suppressing harmonic waves with specific frequencies. According to the invention, the length of the output cable does not exceed 100 meters, and the cable is connected with the filtering assembly, so that harmonic waves in pulse width modulation waves output by the frequency converter are effectively suppressed, and the problems of peak voltage and peak current caused by long cable transmission are avoided, thereby protecting motor insulation and bearings from being damaged, and prolonging the service life of the motor. The problems of harmonic superposition, peak voltage and peak current caused by an overlong cable are effectively solved.

The application discloses a multi-scene power system frequency safety index adaptive partition reconstruction method, comprising the following steps: acquiring system multi-type frequency modulation resource parameters, and establishing an analytical expression of a nonlinear frequency safety index constraint based on a system multi-machine frequency response dynamic model considering the multi-type frequency modulation resources; acquiring a system frequency modulation parameter original feasible range, sampling to generate an original frequency modulation parameter region in the system frequency modulation parameter feasible range and a frequency safety index sample surface set; acquiring all sample point subsets on the inertia boundary in the frequency modulation parameter region by traversing sample points satisfying a system specific equivalent inertia value, acquiring intersection points of sample point corresponding frequency safety indexes and constraint limits on the original frequency modulation parameter region boundary, and re-partitioning the original frequency modulation parameter region into multiple sub-regions; linearizing linear sub-regions needing linearization, outputting linearization parameters satisfying a linear error threshold requirement, and reconstructing a frequency safety index constraint after partition linearization.

The invention provides a transmission / reflection mode reconfigurable frequency selection wave absorber applied to a C / X wave band, which is composed of units arranged periodically, and each unit comprises a loss type frequency selection surface layer, an air layer and a reconfigurable lossless frequency selection surface layer from top to bottom, the loss-type frequency selection surface layer is used for generating two broadband absorption bands in a C wave band and an X wave band, a narrow-band low-loss transmission window is formed between the two broadband absorption bands, a 2.5-dimensional integrated design that an upper layer metal pattern and a lower layer metal pattern are orthogonally arranged and share a central capacitor element is adopted, and the loss-type frequency selection surface layer is of an up-down symmetrical and left-right symmetrical structure; the reconfigurable lossless frequency selection surface layer is used for achieving electric control switching of working modes and comprises a second dielectric substrate, a third dielectric substrate, a top layer metal pattern, a middle layer metal pattern and a bottom layer metal pattern, and the bottom layer metal pattern is located on the lower surface of the third dielectric substrate and is a reconfigurable metal pattern loaded with a PIN diode.

The invention discloses a Ku / Ka dual-frequency shared automatic portable communication antenna, which belongs to the technical field of antennas and comprises a feed source, an antenna reflecting surface, a microwave network, an antenna seat frame, supporting legs and the like. According to the invention, the Ku / Ka integrated feed source, the microwave network and the antenna reflecting surface are adopted, frequency band switching is carried out through the deflector rod type frequency band switching switch, and the operation is simple and efficient; a high-precision split antenna surface is adopted, split panels are high in consistency, the panels can be exchanged, and quick assembly can be realized through positioning of a pressing plate and locking of a lock catch; the antenna seat frame adopts a novel integrated transmission mechanism, and the transmission mechanism has the characteristics of small size and light weight, so that space is reserved to realize the integrated design of the antenna seat frame and the terminal; the antenna appearance design implements the industrial design concept, the cable design is hidden, and the appearance is attractive.

The utility model provides a sealing type frequency converter structure with heat radiation applied to the frequency converter field, comprising a frequency converter housing and a heat conduction substrate, one side of the heat conduction substrate is provided with a longitudinal plate, one side of the heat conduction substrate is also provided with an installation substrate, one side of the installation substrate is fixedly provided with heat radiation sleeve plates, and an installation cavity is arranged among the bottoms of the plurality of heat radiation sleeve plates. A guide groove is formed in the heat dissipation sleeve plate, and one end of the longitudinal plate extends to penetrate through the guide groove into the mounting cavity and is fixedly provided with a horizontal pressing plate; a buffering bag is clamped between the horizontal pressing plate and the mounting base plate, buffering pads are fixed to the upper side and the lower side of the buffering bag, and a plurality of buffering springs are fixed between the two sets of buffering pads at equal intervals. Through the combination of the longitudinal plates, the heat dissipation sleeve plates, the side heat dissipation plates and the heat dissipation fins, a multi-path heat dissipation structure is formed, the heat dissipation area is increased, the heat dissipation efficiency is remarkably improved in combination with the circular flow of the heat dissipation liquid in the buffer bag, and the problem of difficult heat dissipation of the sealed type frequency converter is solved.

The application relates to an ultrathin flexible frequency coding metasurface and a design method thereof, and relates to the field of artificial electromagnetic metamaterials.The frequency coding metasurface designed by the application is composed of optimized reflection type frequency coding supercell structures, the units have different phase-frequency sensitivities, and the coding sequence is designed by utilizing the difference in the phase-frequency sensitivities of the units, so that the continuous regulation of electromagnetic waves is realized.By using a 1-bit coding mode, a two-way beam splitter and a four-way beam splitter can be realized, and by using a 2-bit coding mode, the regulation of a single beam in different directions can be realized.The application has the characteristics of simple structure, easy design, ultrathinness, flexibility, high symmetry, passivity and low cost, and has great application potential and good engineering application prospect in the fields of wireless communication, radar, imaging and signal processing.

The invention provides an acceleration and displacement cooperative control method for an earthquake simulation vibration table, which can ensure high-precision control of acceleration and displacement while keeping residual displacement, and belongs to the field of structure test technology and electro-hydraulic servo control. According to the method, an acceleration and displacement double-closed-loop control system is constructed, an inner loop adopts PID control to achieve displacement accurate tracking, and an improved three-parameter controller is introduced into an outer loop to achieve high-precision response of acceleration; and in combination with a three-parameter power exponent type frequency division iterative algorithm, performing off-line optimization on the feedforward control signal. Efficient communication between an MATLAB / Simulink control model and a hardware system is achieved through a multifunctional PCI data acquisition card, and residual displacement is accurately kept by means of model parameter configuration. According to the invention, high-precision reproduction of complex seismic waveforms by the seismic simulation vibration table is realized, the problem of residual displacement maintenance is solved, and the simulation capability of near-fault earthquakes and complex working conditions containing residual displacement characteristics is improved.

1. The name of the design product: split frequency converter. 2. The use of the design product: the design product is used as a frequency converter for the control of household elevators, intelligent manufacturing, industrial automation and other equipment. 3. The design points of the design product: the combination of shape and pattern. 4. The picture or photo that best indicates the design points: perspective view 1.

This invention proposes a compacted field reflector with a frequency selective surface (FSS) around its edge to address the severe low-frequency edge scattering problem of existing reflectors. The reflector comprises a parabolic compacted field reflector body and a frequency selective surface (FSS) loaded along its edge. The parabolic compacted field reflector body has a sawtooth edge. The frequency selective surface (FSS) includes a dielectric substrate and a resistor patch printed thereon. The dielectric substrate and the parabolic compacted field reflector body form a nested structure, with periodically arranged triangular sawtooths around its perimeter. The resistor patch is etched with a plurality of periodically arranged first cross-shaped slits and a plurality of second cross-shaped slits. This invention loads a resistor-type frequency selective surface structure at the edge of the reflector, reducing reflection abrupt changes and edge currents, improving edge scattering, and enhancing quiet zone performance, making it suitable for compacted field measurement systems.

The utility model discloses a dust screen quick detachable frequency converter shell structure, the utility model relates to frequency converter dustproof technical field. A dust screen quick detachable frequency converter shell structure includes, including shell and dust screen, still include: a plurality of buckle assembly no.

The invention discloses a frequency mixing interpolation type frequency source and an implementation method thereof, and relates to the technical field of radar communication. The device comprises a reference clock, a DDS, a VCO, a frequency mixer, an active N frequency multiplier, a voltage-controlled filter, a / N frequency divider and an FPGA controller. In the initial stage of frequency switching, an FPGA controller controls a radio frequency switch to be connected to an active N frequency multiplier link, N frequency multiplication is carried out on a target frequency fo and an image frequency fy + fx at the same time, after the image frequency is suppressed by a voltage-controlled filter, fo is recovered through / N frequency division, and error-lock-free capture is completed; and after locking, switching to a straight-through path and disconnecting the power supply of the frequency multiplier. According to the invention, wrong locking is effectively prevented, extra phase noise and stray are not introduced during steady-state work, and high-performance frequency synthesis is realized.

The application provides a kind of space-time modulation type frequency adjustable non-magnetic non-reciprocal band-pass filter, the filter includes: the radio frequency input port is connected with the one end of the transmission line in the first coupling line, and the other end is connected with the first short-circuit stub;The one end of the other transmission line of the first coupling line is connected with the anode of the first variable capacitor, and the other end is connected with the first short-circuit stub;The one end of the transmission line in the open circuit coupling line is simultaneously connected with the cathode of the first variable capacitor and the first modulation port, and the other end is open;The one end of the other transmission line is simultaneously connected with the cathode of the second variable capacitor and the second modulation port, and the other end is open;The radio frequency output port is connected with the one end of the transmission line in the second coupling line, and the other end is connected with the second short-circuit stub;The one end of the other transmission line of the second coupling line is connected with the anode of the second variable capacitor, and the other end is connected with the second short-circuit stub.

The present application relates to the resonant cavity for power input coupler exercise. One end of the resonant cavity for power input coupler exercise is connected with one coupler, input microwave power, the other end of the resonant cavity for power input coupler exercise is connected with another coupler, output microwave power. The resonant cavity for power input coupler exercise includes resonant cavity cavity, tuner and coupling port transition adapter. The resonant cavity cross type frequency tuning unit is used to adjust the resonant cavity operating frequency; the coupling port transition adapter is used to match the inconsistency of the resonant cavity coupling port size and the high power input coupler power output port size; the tuner is used to ensure that the cavity frequency is consistent with the high power coupler frequency; the resonant cavity for power input coupler exercise has the advantages of adjustable frequency and adjustable coupling port size, etc. not only reduces the offline high power exercise cost, but also saves the resonant cavity storage space.

The application discloses a V-type frequency modulation signal generation method and system, comprising: obtaining a discrete model of the V-type frequency modulation signal, obtaining a frequency increment and a frequency initial parameter through a first-order difference relationship between a frequency and a phase of the discrete signal; taking the frequency increment, the frequency initial parameter and a constant term as positive frequency modulation digital control parameters, constructing a linear increasing sequence based on the frequency increment, obtaining an instantaneous frequency value at different moments by sequentially superimposing the frequency initial parameter, superimposing the constant term on the instantaneous frequency value at different moments to obtain a phase sequence of a positive frequency modulation slope; performing a negation processing on the positive frequency modulation digital control parameters to obtain a phase sequence of a negative frequency modulation slope; and converting the phase sequence into amplitude data according to a sine waveform to generate the V-type frequency modulation signal. The application can greatly reduce the operation amount of control parameters and the data transmission amount in the signal generation process by optimizing parameter configuration logic and simplifying operation, significantly improves the calculation efficiency and reduces the consumption of calculation resources.