135 results about "Switched filters" patented technology

The invention discloses a low-cost broadband direct synthesis type frequency source, belongs to the technical field of radar communication, and mainly solves the problem that a traditional direct synthesis type frequency source cannot simultaneously realize low phase noise, short frequency hopping time and low cost. The frequency source comprises a harmonic generation circuit, a power division circuit connected with the harmonic generation circuit, a switch matrix connected with the power division circuit, and a frequency mixing synthesis circuit connected with the switch matrix. Wherein the harmonic generation circuit is used for generating a harmonic signal, the power division circuit is used for dividing the harmonic signal into six paths, and the switch matrix is used for outputting two paths of 12-17GHz signals from the power-divided signals. Compared with the traditional direct synthesis type frequency source, the direct synthesis type frequency source disclosed by the invention has the advantages that one harmonic generator and one switch filter group are omitted, so that the direct synthesis type frequency source disclosed by the invention realizes a low-cost broadband direct synthesis type frequency source.

The invention discloses a flow-choking impact-resistant defoaming type return oil filter, and relates to the technical field of hydraulic filters, the flow-choking impact-resistant defoaming type return oil filter comprises a filter shell, an oil inlet and an oil outlet, the oil inlet and the oil outlet are formed in the two ends of the filter shell, and a cavity communicated with the oil inlet and the oil outlet is formed in the filter shell; and the connecting column is fixedly connected to the interior of the cavity, the outer wall of the connecting column is fixedly connected with a spiral track, and the spiral track is arranged on one side of the oil inlet. By arranging the switching filtering mechanism, impurities in backflow hydraulic oil are filtered out through the filtering plate, a filtering channel can be switched through the switching filtering mechanism after a period of time, then the backflow hydraulic oil can be intermittently filtered through the filtering box, and the situation that the filtering plate is blocked due to the fact that the impurities are accumulated on the filtering plate is avoided; therefore, the hydraulic oil filtering efficiency is improved, and the overall practicability of the device is improved.

The utility model discloses a multi-stage filtering device for directional extraction of plants, and belongs to the technical field of plant extraction. The device mainly comprises a centrifugal separator and a filtering mechanism, a water inlet pipe is mounted at the top of the centrifugal separator, a conveying mechanism is arranged between the centrifugal separator and the filtering mechanism, and the filtering mechanism comprises a supporting seat, a top cover and a turntable. According to the multi-stage filtering device for directional extraction of the plants, the driving assembly is used for controlling the rotating disc to rotate by 180 degrees discontinuously, so that the positions of the two filtering nets are exchanged, the switched filtering nets can continue to intercept plant residues, the downtime of the device is shortened, in the rotating process of the rotating disc, a series of transmission structures are used, and the device is convenient to operate. The filter screen is driven to turn over by 180 degrees, plant residues intercepted on the surface of the filter screen automatically fall into the sewage tank under the action of gravity, meanwhile, the filter screen is flushed through cooperation with the high-pressure spray head, the self-cleaning purpose of the filter screen is achieved, and the labor intensity of manual cleaning of operators is remarkably relieved.

The invention discloses a sewer sewage filter valve with a self-switching filter screen, and belongs to the technical field of sewer sewage filtration, the sewer sewage filter valve comprises a valve body, a water inlet pipe is fixed on one side of the valve body, a support shaft is rotatably arranged in the valve body, and a self-switching mechanism is arranged on the side of the filter screen; the movable shaft rotationally penetrates through the interior of the water inlet pipe, fixing blocks are arranged on the outer side of the movable shaft at equal angles, and the cleaning assembly is arranged at the top of the valve body; and the adjusting mechanism is arranged between the cleaning assembly and the valve body, and the adjusting mechanism is used for adjusting communication and plugging between the cleaning assembly and the valve body and between the water outlet pipe and the valve body. The filter screen self-switching type sewer sewage filter valve is provided with a filter screen self-switching structure, and the filter screen does not need to be manually detached for replacement, so that the phenomenon of poor sewage discharge effect caused by untimely replacement can be avoided, intercepted garbage can be conveniently cleaned out, and the influence of a large amount of residual garbage on subsequent sewage discharge smoothness is prevented.

The invention discloses a low-power-consumption phase-locked loop circuit with an automatic frequency calibration function. Comprising a voltage-controlled oscillator, an automatic frequency calibration module, a programmable frequency divider, a phase frequency detector, a plurality of charge pump arrays and a switch filter, wherein the automatic frequency calibration module and the programmable frequency divider are in signal connection with the voltage-controlled oscillator; the phase frequency detector is in signal connection with the programmable frequency divider; the charge pump arrays are in signal connection with the phase frequency detector; the switch filter is in signal connection with the voltage-controlled oscillator; the voltage-controlled oscillator comprises a plurality of delay units, and the voltage-controlled oscillator is an annular oscillator formed by cascading a plurality of delay unit rings. The delay unit is a cross-coupled structure based on an inverter and comprises a plurality of transistors, and the plurality of transistors comprise a plurality of PMOS (P-channel Metal Oxide Semiconductor) transistors and a plurality of NMOS (N-channel Metal Oxide Semiconductor) transistors. According to the invention, under the low power supply voltage, four-phase intermediate frequency signals are output with extremely low power consumption, and the application requirements of rapid locking and low noise are met.

The invention discloses a 3D printing alloy powder filtering device and a filtering assembly, and relates to the technical field of powder treatment for metal additive materials, the 3D printing alloy powder filtering device comprises a self-treatment assembly, the self-treatment assembly comprises a box body, two material pipes are symmetrically and fixedly connected to the box body, a rotating disc is rotatably connected to the inner side wall of the box body, and four first through holes are formed in the rotating disc in an annular array mode; a second through hole is formed in the circle center position of the rotating disc, a filter screen is arranged in each of the four first through holes of the rotating disc, a first servo motor is fixedly connected to the bottom of the inner wall of the box body, and the first servo motor is sleeved with a protective pipe; the operation of the self-processing assembly breaks through the efficiency bottleneck of a traditional filtering device from the two aspects of blockage prevention and quick blockage removal through dynamic switching of a filter screen and an active screen cleaning mechanism, the filtering quality of the alloy powder is guaranteed, the production efficiency is remarkably improved through continuous operation and automatic screen cleaning, and the self-processing assembly has both practicability and innovativeness.

A tracker module is provided with a reduced size. The exemplary tracker module includes a module laminate, an IC chip, and a filter circuit. The IC chip is disposed on the module laminate. The IC chip includes at least one switch included in a supply modulator. The filter circuit includes variable reactance elements whose reactance is varied. The variable reactance elements include at least one reactance element and at least one switch. The at least one switch of the variable reactance elements in the filter circuit is integrated in the IC chip.

Provided in the present invention are a radio-frequency front-end anti-interference filtering segmentation method, and an electronic device and a radio-frequency front-end module. Operating bandwidths, the number and center frequencies of radio-frequency filters required by a switch filter circuit are determined on the basis of radio-frequency operating frequency bands, and the principle of minimizing the number of radio-frequency filters or the principle of maximizing an anti-interference capability; as such, operating parameters of the required radio-frequency filters can be flexibly designed on the basis of radio-frequency operating frequency bands to be covered, thereby achieving customized filtering performance optimization, and providing reverse guidance for the design of the radio-frequency filters; moreover, when there is an overlapping region between the operating bandwidths of two radio-frequency filters having adjacent bandwidths in the switch filter circuit, for radio-frequency operating frequency points in the overlapping region, one of the two radio-frequency filters corresponding to the overlapping region is selected on the basis of different filtering requirements to perform anti-interference filtering processing on the radio-frequency operating frequency points, thereby effectively taking into consideration other performance requirements while achieving high-precision filtering and directional accurate filtering.

The application discloses a detector filter device capable of automatically switching filters and belongs to the technical field of pesticide residue detection. The detector filter device capable of automatically switching filters comprises a filter shell, the filter shell is a hollow structure, circular through holes are formed in the upper side and the lower side of the filter shell in a corresponding manner, a lens is mounted in the circular through hole in the lower side, an adjusting rotating shaft is vertically arranged at the center of the inside of the filter shell, bearings are fixed at the centers of the upper side and the lower side of the filter shell, and the outer wall of the filter shell is fixed with symmetrically arranged first filter structure and second filter structure. The first filter structure and the second filter structure can realize quick switching of two filters, and the surface can be automatically cleaned during the switching process, so that the filter effect is guaranteed. The detector contains two filters, the two filters can be switched according to needs in one detector, the cost is reduced, the detection items of a single detector are increased, the difficulty of not leaking light is overcome, and the utilization rate of the detector is improved.

The invention discloses an efficient cleaning device for target material machining, and belongs to the technical field of target material machining. The efficient cleaning device comprises a cleaning shell, and clamps are arranged on the two sides of the cleaning shell; the washing mechanism comprises a spraying box and a cross frame, the cross frame is fixedly installed in the cleaning shell, the top of the spraying box communicates with a plurality of nozzles, the bottom of the spraying box communicates with a connecting pipe, and the connecting pipe is rotationally connected into the cross frame; the switching filtering mechanism comprises a rotating ring and a plurality of filter elements, the rotating ring is rotatably mounted at the bottom of the cleaning shell, and the filter elements are detachably mounted at the outer edge of the bottom of the cleaning shell; and the pressurizing mechanism comprises a pressurizing disc and a driving plate. According to the cleaning device, the cleaning degree of the target material can be judged by testing the filtering resistance of cleaning wastewater in the cleaning process through the arranged pressurizing mechanism and the arranged switching filtering mechanism, so that thorough cleaning work on the target material is guaranteed.

Provided is a multiplexer capable of transmitting signals of two frequency bands having a small frequency gap at the same time in a wave-divisible manner. A multiplexer (1) is provided with filters (10, 20) connected to a common terminal (100). The filter (10) is provided with: series arm resonators (s11-s15) disposed in a first series arm path; and a first variable capacitance circuit connected in parallel to the series arm resonator (s11) closest to the common terminal (100), the first variable capacitance circuit having a capacitor (31) and a switch (41) connected in series with each other, the filter (20) being provided with: parallel arm resonators (p21 and p22) connected between the second series arm path and ground; and a second variable capacitance circuit connected in series to the parallel arm resonator (p21) closest to the common terminal (100), the second variable capacitance circuit having a capacitor (32) and a switch (42) connected in parallel to each other.

The application discloses a multi-octave wideband frequency conversion assembly, which comprises a frequency conversion circuit, an amplitude control circuit and a switch filter set, wherein the frequency conversion circuit expands the input radio frequency to an intermediate frequency signal through two local oscillator frequency points for the input radio frequency signal and outputs the intermediate frequency signal to the amplitude control circuit; the amplitude control circuit adjusts the amplitude of the intermediate frequency signal output by the frequency conversion circuit; the switch filter set filters the signal output by the amplitude control circuit through a multi-path filter set, filters out harmonics and stray signals, and performs amplitude correction to obtain a multi-octave intermediate frequency output signal. The 3-4GHz signal is expanded to a ten-octave signal of 0.2-2GHz which can be directly processed by a digital circuit through the two local oscillator frequency points of 4 / 5GHz, the output power reaches 10dBm, the harmonic suppression reaches more than 48dBc, the power flatness reaches ±1dB, the dynamic range reaches more than 60dB, and the step is only 0.25dB.

A distributed ice melting device topological structure suitable for an ultra-high voltage power transmission line comprises a plurality of ice melting sub-modules arranged in a distributed mode, and each ice melting sub-module comprises a single-turn coupling transformer, a metal oxide voltage limiter, a bypass switch, a filter, an H-bridge current converter and a direct-current capacitor. A primary winding of the single-turn coupling transformer is directly formed by split sub-conductors of the ultra-high voltage power transmission line, and a secondary winding of the single-turn coupling transformer is electrically connected with other parts of the ice melting sub-modules, so that the ice melting sub-modules are connected in series on the split sub-conductors of the power transmission line in a distributed manner; the H-bridge current converter is electrically connected with the direct-current capacitor, and the direct-current capacitor provides smooth direct-current voltage for the H-bridge current converter; the filter is connected in series with the H-bridge current converter, the bypass switch is connected in parallel with the H-bridge current converter, and the metal oxide voltage limiter is connected in parallel with the line side output end of the ice melting sub-module; and the ice melting sub-modules adjust the current of the corresponding split sub-conductors by changing the equivalent impedance of the ice melting sub-modules, so that accurate ice melting of the ice-coated split sub-conductors is realized, and the overall current and the transmission power of the power transmission line are kept unchanged. The technical problem to be solved by the invention is to provide the distributed ice melting device topological structure suitable for the ultra-high voltage power transmission line, and the technical problem that the existing ice melting technology cannot realize accurate ice melting and non-power-cut operation on an ice coating section on the ultra-high voltage power transmission line is solved. And normal transmission of the line is affected due to overlarge capacity demand, line overcurrent or incapability of three-phase synchronous ice melting.

The application discloses a kind of semi-integrated miniaturized LC filter, preparation method and switch filter group, the LC filter includes ceramic substrate, ceramic substrate is made of top layer, middle layer and bottom layer, wherein multiple capacitors are integrated in ceramic substrate middle layer by LTCC process, pad is provided on the surface of ceramic substrate top layer, multiple inductors are welded on pad;All inductors form the required circuit connection by pad and capacitor, rectangular pad is respectively provided at the left and right ends of ceramic substrate bottom layer, used as the input, output port of LC filter signal, ground pad is provided between the two rectangular pads of ceramic substrate bottom layer, to ensure that LC filter is well grounded.The capacitor is integrated in ceramic substrate in the application, the space occupied by the separated capacitor is saved, and the process is simpler than the process of semi-integrated LC filter and IPD process designed chip LC filter;Small volume separated inductor is used instead of integrated inductor, which can improve the Q value of the filter and reduce the loss.

The utility model relates to the technical field of chocolate production and processing, in particular to a filter sieve for chocolate production, which comprises a barrel body, the top and the periphery of the barrel body are respectively provided with a feed hopper and an open slot which are communicated with an internal cavity, and a turntable and a vibrating piece are arranged in the cavity of the barrel body. A plurality of filter screens with different mesh numbers are arranged on the turntable; wherein the rotating disc can switch the filter screen through a positioning structure, the filter screen and the feeding hopper are correspondingly arranged, the filter screen and the rotating disc are detachably connected, and through the arrangement of the positioning structure, on one hand, a connecting rod connected with the rotating disc can be limited and fixed, and on the other hand, the connecting rod can be detachably connected with the rotating disc; and on the other hand, the rotating disc can be driven to switch the filter screens by adjusting the rotating mode of the connecting rod, so that the filter screens with different mesh numbers correspond to the feeding hopper, and the rotating disc can be disassembled by pressing the telescopic column ends of the positioning glass beads after long-time use.

The invention discloses an ultra-wideband step-frequency radio-frequency front end with high-order harmonic suppression, which comprises a transmitter and a receiver, a high-frequency local oscillator enters a power divider after passing through a driving amplifier and a band-pass filter, one path of output signal is used as an intermediate-frequency signal of a down-conversion mixer and is mixed with a step-frequency signal, and the step-frequency signal is output to the receiver; taking a sideband signal through a low-pass filter, and transmitting the sideband signal to a transmitting antenna through a power amplifier; in a receiver, a signal of a receiving antenna sequentially passes through a low-noise amplifier and a band-pass filter, enters a frequency mixer and is mixed with a coupled stepping frequency signal, an upper sideband signal in an output signal is taken, passes through a driving amplifier and the band-pass filter and then is subjected to IQ frequency mixing with the other path of signal output by a power divider, and a signal output by a power divider is obtained. And respectively carrying out AD sampling on the I channel and the Q channel. According to the invention, the high-order harmonic of the transmitted signal can be effectively suppressed without switching a filter bank, and the cost is effectively reduced while the complexity of the system is reduced.

The utility model discloses a one key presses and switches filter material's water outlet device, including the body that is equipped with the water passing cavity and the water outlet, and the water passing cavity is connected with the water outlet, is equipped with the ejection assembly in the body, and it can axial movement and has the cavity of placing filter material. Ejection assembly realizes the cavity switching in the body through the cooperation of the guide column and the undulating guide groove, and in combination with spring reset and one -way valve check structure ensures that the operation is convenient and safe. The utility model discloses through pressing quick replacement filter material, simplifies the operation step, prevents water flow splashing, optimizes water flow path to fully flush filter material, is applicable to carbonic acid spring wash head and a variety of scenes, has remarkable technical advantage and market application prospect.

The utility model discloses a double-filter-screen circulating sewage pump which comprises a main body mechanism. The main body mechanism comprises a sewage pump main body, a water outlet pipe installed on one side of the sewage pump main body, a water inlet pipe installed on the other side of the sewage pump main body, a four-way shell symmetrically fixed to the top end of the sewage pump main body, a control base rotationally arranged in an inner cavity of the four-way shell, and a servo motor installed at the top end of the four-way shell and connected with the control base through a shaft. The four-way shells are symmetrically arranged on the two sides of the sewage pump body, the filtering pieces are symmetrically arranged between the opposite four-way shells and communicate with the four-way shells on the two sides, the sewage discharge pipe is installed on the four-way shell on one side, and the water diversion piece is installed on the four-way shell on the other side and communicates with the water outlet pipe. The double-filter-screen circulating sewage pump has the advantages that the double-filter-screen circulating switching filtering is achieved, and the filter screens are automatically cleaned.

The utility model discloses a power line conduction emission environment noise testing device. The device comprises a metal box, a passive load module and a fan heat dissipation module. The passive load module is arranged on the upper portion in the metal box, the fan heat dissipation module is arranged on the lower portion in the metal box, and the passive load module and the fan heat dissipation module are separated through a metal partition plate. The passive load module comprises a first connector, an air switch, a plurality of mechanical voltmeters and a plurality of RLC circuits. The fan heat dissipation module comprises a second connector, a switch, a filter and an electric fan. The load has resistance characteristics, capacitive reactance and inductive reactance effects, the impedance of the load can be adjusted, environmental noise under different load impedances can be detected, whether the environmental noise of a laboratory meets the standard test requirement or not can be effectively detected, the test mode is closer to the test mode of a tested product, the test result is more accurate, and the test efficiency is improved. And the interference of environmental noise on the test of the tested product can be eliminated.

The present application relates to river filtering technical field, especially a kind of rotating filter screen with electric control translation mechanism, including the top beam of being installed in the upper end opening of river and the bottom limit frame of being fixed in river bottom, top beam lower end is fixedly equipped with the upper translation guide rail.The rotating filter screen with electric control translation mechanism of the present application can be switched according to the scene needs by adopting double-section structure design, so that its applicable scene greatly improves;By using electric control translation and overturning adjustment mode, the angle and position of rotating filter screen can be controlled, and the operation is more convenient;By using the design of top beam and bottom limit frame, the impact resistance of the entire rotating filter screen can be enhanced, and the structure is more stable;Rotating filter screen can be quickly attached on both sides of river by splitting, not only can switch filtering mode, but also can change the barrier inside main river, facilitate internal ecology, improve different application scenarios.

The invention discloses a single-pole double-throw switch filtering assembly based on an LTCC (Low Temperature Co-Fired Ceramic) technology. A switching circuit and an LTCC resonator are integrated, and the on-off state of a switching diode in the working process is controlled by an externally applied direct current bias voltage. When the diode is in a conducting state, the parasitic inductor and the capacitor form series resonance, and the equivalent coupling admittance converter passing through the resonator can be inverted and equivalent to an open circuit, so that a branch signal is cut off, and channel isolation is realized; and when the diode is in a closed state, the electromagnetic field distribution of the substrate integrated waveguide resonator is not obviously influenced, the filter keeps normal work, and signal passband transmission is realized. According to the structure, on one hand, the SIW waveguide integration form is used for achieving the low insertion loss characteristic; and on the other hand, the stop-band suppression degree is effectively improved by introducing the cross coupling topology. The whole circuit has the advantages of being compact in structure, low in loss, high in isolation degree, excellent in out-of-band rejection performance and the like, and the requirements of 5G and future high-speed wireless communication systems can be met.

The utility model relates to the technical field of switch filters, in particular to a switch filter assembly, which comprises a plurality of filters, a controller, a channel switching module and a monitoring module. The monitoring module monitors the working condition of each channel switching module in real time, and if a certain channel switching module breaks down and all channels are switched on, the monitoring module immediately controls all the channel switching modules to be in a switched-off state; according to the utility model, the filters are divided into the first-stage filter and the second-stage filter, and the channel switching module is arranged between the first-stage filter and the second-stage filter, so that the filter can receive various types of frequency signals, and can output different types of frequency signals. According to the utility model, the problem of the filter channel switching module in the aspect of stable control of channel connection and disconnection is solved.

The utility model relates to the technical field of water mist fire extinguishing devices, and discloses a high-pressure water mist fire extinguishing device which comprises a rack, a high-pressure pump set is fixedly mounted on the rack, and a control cabinet is fixedly mounted at the top of the rack; and the switching filtering mechanism is arranged at the water inlet end of the high-pressure pump set, and the switching filtering mechanism is used for automatically switching the filtering structure. Through the design of the ultrasonic flow meter, the flow of water entering the high-pressure pump set can be monitored, when the flow of the water is low, it is indicated that too many impurities are attached to the barrel-shaped filtering piece, and then the first electric valve pipelines corresponding to the barrel-shaped filtering piece are controlled to be closed completely; and then all second electric valve pipelines are opened, water used by the high-pressure pump set is filtered with the help of the other barrel-shaped filtering piece, the water filtering efficiency is guaranteed, the problem that fire extinguishing work is greatly affected due to the fact that the water flow is reduced is solved, and the safety of the structure in use is improved.

A wind power grid impact damping suppression method based on branch and bound and knapsack optimization control can realize efficient and rapid suppression of wind power fluctuation. The device is characterized by combining the advantages of thyristor switched filter (TSF) and active power filter (APF), and developing active damping generator technology based on knapsack optimization control for wind power grid impact suppression. The developed ADG technology has the following advantages: ① It has the characteristics of TSF harmonic impact suppression, voltage mutation and high cost performance; ② It has the characteristics of APF output damping continuous adjustable and high precision; ③ Based on branch and bound, the wind power impact is classified as the reference of the maximum damping of ADG output, which effectively improves the rapidity and stability of ADG response; ④ The knapsack problem (UKP) is used to realize the optimal switching control of ADG, which meets the minimum cost and efficient wind power disturbance impact suppression.

The utility model discloses a filter box for defoaming agent production, which comprises a base, one side of the top of the base is fixedly connected with a feed liquid box, one end of the feed liquid box is connected with a switching filter mechanism, the switching filter mechanism comprises a liquid delivery pump, the output end of the liquid delivery pump is connected with a switching seat, the end part of the switching seat is connected with two connecting pipes, and the two connecting pipes are connected with the switching seat. The end parts of the two connecting pipes are fixedly connected with box bodies, and top covers are arranged at the tops of the two box bodies. According to the filter box for defoaming agent production, the hand wheel is rotated to drive the two valve plates to block the original working connecting pipe and open the other idle connecting pipe, the flow direction of feed liquid is switched and changed, the feed liquid is fed into the idle box body from the original working box body through the liquid feeding pump, the filter plate is taken out from the original working box body through the lifting handle, and the filter plate is taken out through the lifting handle. The filter plate is cleaned and replaced without shutdown, and the feed liquid can be continuously filtered, so that the production efficiency can be effectively improved.

The invention discloses an anti-interference receiver and a radar system thereof. The anti-interference receiver comprises a numerical control attenuator module, a pre-amplifier module, a switch, a filter and a post-amplifier module which are connected in sequence, wherein the numerical control attenuator module is used for automatic gain control; the post-stage amplifier module comprises at least one post-stage amplifier, and the post-stage amplifier is a GaAs HBT (Heterojunction Bipolar Transistor) amplifier. According to the invention, the anti-interference capability of the receiver to in-band interference can be fundamentally improved, the linear working state can be rapidly recovered, and stable operation of a radar system is ensured. Meanwhile, the dynamic range of the receiver is expanded, so that the receiver can adapt to various interference conditions in a complex electromagnetic environment.

The invention discloses a method for fusing a microwave and millimeter wave monolithic integrated switch and a filter, which is characterized in that when the method is used for fusing a single-pole double-throw switch and a band-pass filter, two parallel channels are connected between a signal input end and a signal output end; the first channel comprises a switching circuit, a first capacitance-inductance tuning unit, a first filter and a second capacitance-inductance tuning unit which are connected in series; the second channel comprises a switching circuit, a third capacitance-inductance tuning unit, a second filter and a fourth capacitance-inductance tuning unit which are connected in series, and the four capacitance-inductance tuning units have the same structure; the capacitance-inductance tuning unit is cascaded between the switch and the band-pass filter, and the capacitance is integrated into the design of the switch, so that the frequency band of the switch is widened; a parasitic capacitor and a capacitance and inductance tuning unit existing in the switch are integrated into the design of the band-pass filter, so that the insertion loss, the return loss and the out-of-band rejection of the switch filter bank after integral cascade connection are improved.

This invention relates to the field of power system technology and discloses a method, system, equipment, and medium for line power flow regulation in power systems. The method involves collecting operational data of the power system after the integration of renewable energy equipment to predict the target value of reactive power demand. When this value falls within the regulation capacity range of reactive power flow regulation equipment, including bypass switches, LC filters, H-bridge converters, and DC capacitors, multiple target devices are determined based on the capacity margin of the equipment and its electrical distance from the renewable energy equipment. A quadratic programming model is constructed and solved based on the target value of reactive power demand to obtain the output strategy of the target devices, which is then sent to the corresponding target devices to control the line power flow through decoupling control technology. The regulation results are verified; if the verification fails, the target value of reactive power demand is incrementally corrected, and the strategy is re-solved until the final verification is successful, thereby achieving effective regulation of line power flow in the power system.

The utility model discloses a kind of double filter element devices of three valve control positive and negative washing, it is related to filter relevant technical field.The utility model includes two groups of symmetrically arranged shell;The inside of shell is provided with filter element, and the both ends of filter element pass through towards the two port positions of shell, and the both end surfaces of shell are provided with the sealing cover of sleeve joint in the both end positions of filter element, and three-way valve one is set between the sealing cover above shell, and the both port of three-way valve one is connected with the sealing cover port of similarity by spiral pipe and is screwed, and three-way valve two is set between the both sealing cover below shell, and the lower part of position between two groups of shell is provided with backflush pipe, and the port position of backflush pipe is connected with on-off valve.The utility model is used in cooperation with three-way valve one, three-way valve two and on-off valve, cooperates three-way valve control, so that backwash liquid enters two groups of filter element simultaneously, significantly improves cleaning efficiency, simultaneously realizes switching filter / backflush mode, and simplifies operation.