33results about How to "Solve the problem of high loss" patented technology

The invention relates to a low-power-consumption cloud computing cabinet heat radiation system comprising multiple cabinet bodies which are arranged side by side, and a refrigeration device. The cabinet bodies are internally provided with servers. Each cabinet body comprises a pedestal, a top cover, a front door, a rear door and two side doors. The top cover is provided with an air outlet. The pedestal is provided with an air inlet. The refrigeration device is connected with the air inlet via arrangement of a pipeline. Each cabinet body is internally provided with baffle plates which divide the cabinet body into drainage channels formed through connection with the air inlet and cavities used for placing the servers. The baffle plates are provided with multiple air holes. The low-power-consumption cloud computing cabinet heat radiation system is reasonable in design, high in heat radiation and high in efficiency and solves a problem of high air-conditioning loss.

The invention discloses a current source type double three-phase permanent magnet synchronous motor driving system of SiC device adopting soft switching technology, The system includes two motor stator winding ports on the side of double three-phase permanent magnet synchronous motor, two current source inverters connected in series with each other, two three-phase filter capacitors, DC bus inductance, power chopper, voltage source and zero voltage switching auxiliary circuit. The method comprises the following steps: a control process of the current source inverter 1, a control process of thecurrent source inverter 2, and a control process of the soft switch. The multi-phase winding is fed by two current source power converters in series, The reliability and fault tolerance of the motordrive system are improved, and the soft switching technology and active damping technology are adopted at the same time, which makes the switching of SiC device flexible, suppresses the electromagnetic interference problem caused by the high frequency operation of SiC device, improves the performance of the motor drive system, and has the advantages of small torque ripple and strong fault tolerance.

The invention relates to a substrate integrated gap waveguide coupler design method. A coupler structure is formed by the close connection of an upper dielectric plate (5) and a lower dielectric plate(6). The upper surface of the upper dielectric plate (5) is provided with a grounding metal layer through printing, and the lower surface of the upper dielectric plate (5) is provided with a couplingmicrostrip line (13) through printing. The upper surface of the lower dielectric plate (6) is provided with an H-shaped coupling microstrip line (12) through printing, and the H-shaped coupling microstrip line (12) and a metal via hole (11) form an H-bridge transmission ridge. Two sides of the H-bridge transmission ridge are each provided with a first EBG structure array (9), and the center of the H-bridge transmission ridge is provided with a second EBG structure array (10), wherein the lower surface is printed with a metal layer. The method provided by the invention is improved from the theoretical basis of a microstrip branch line coupler. The waveguide coupler is easy for integration, is small in size, is wide in bandwidth, is small in loss, and is higher in isolation degree.

The invention discloses a slot-coupling directional coupler based on an integrated substrate gap waveguide. The coupler comprises two ISGW coupling waveguides with same structure, and each coupling waveguide comprises a via hole layer dielectric plate and a gap layer dielectric plate. One surface of the via hole layer dielectric plate is printed with a metal ground layer, the other surface of thevia hole layer dielectric plate is printed with a periodic circular metal patch and a coupling microstrip line, and metal via holes are formed in the circular metal patch and the coupling microstrip line; one surface of the gap layer dielectric plate is printed with a coupling microstrip line, and the other surface of the gap layer dielectric plate is printed with a metal ground layer with a coupling gap; the upper surface of each gap layer dielectric plate is tightly connected with the lower surface of the corresponding via hole dielectric plate to form the corresponding coupling waveguide; and the two coupling waveguides are tightly connected after 180-degree relative rotation. The slot-coupling directional coupler can overcome the disadvantages of an existing coupler, realizes broad broadband and relatively high isolation simultaneously, and has the advantages of easy integration, small size, adjustable coupling coefficient, broad broadband, relatively high isolation, applicabilityfor 5G frequency bands and the like.

The invention belongs to the technical field of double-inverter open winding induction motors, in particular to an optimal model predictive control method for a double-inverter open winding inductionmotor. The optimal model predictive control method comprises the following steps: (1) constructing a weightless factor value function; (2) studying and establishing a virtual ideal vector FCS-MPC; (3)and introducing a loss factor to construct a low switching frequency control strategy. The problem of high switching loss of OEWIM in high power applications can be analyzed and solved.

The invention relates to a driving system of a GaN power device, which mainly comprises a control circuit 1, a resonant circuit and a lossless buffer circuit 3, wherein the resonant circuit further comprises a turn-on resonant circuit 2 and a turn-off resonant circuit 4, and the driving circuit is enabled to have an ability of providing asymmetrical output through the upper and lower different charging and discharging circuits. The energy stored in a capacitor C is fed back to a power supply through an inductor L in the turn-off process of a switching tube by using a resonant principle, so that the energy is enabled to be effectively utilized. Meanwhile, the lossless buffer circuit is added to slow down the rising speed of voltage, so that the GaN power device is protected to a certain extent, and a problem of high loss of the GaN power device driving circuit is solved.

The invention discloses a combined landfill leachate treatment process. Landfill leachate is nondegradable sewage with the characteristics of great water quality changes (instable water quality), complex water quality (multiple heavy metal ions and ammonia nitrogen are contained), high organic concentration, low biodegradability and the like. The invention provides an efficient and feasible method for treating the landfill leachate. Pretreated leachate is treated by virtue of a combined MVR+CWPO process, and a deep CWPO degradation reaction is performed to achieve a relatively high COD removal rate by fully utilizing the high-temperature effluent of an MVR system, wherein a heterogeneous catalyst adopted for CWPO is relatively low in cost and easy to separate and recover, and the COD of the effluent can be kept below 50 mg / L after 300 h running under low temperature and normal pressure. The process is favorable for researches on harmless and resourceful treatment of the landfill leachate, and has great scientific and application significance, and the up-to-standard release requirement of the landfill leachate is met.

The invention belongs to the technical field of multi-material and multi-structure mid-infrared optical fiber preparation, and more particularly, relates to a low-cost batch preparation method and system of a mid-infrared optical fiber with an adjustable material and structure. The structure design of a crucible is used to realize control of a fiber shape, a double crucible method is used to makean initial preform, and the initial preform is used as a base structure to prepare a multi-material and multi-structure mid-infrared optical fiber preform by combination with a high-performance polymer film winding method, and a batch of highly-flexible, multi-material, multi-structure, and low-loss mid-infrared optical fibers are prepared by using a hot drawing method, so that the problem of core-cladding interface defects, impurity introduction, and tedious preparation process when chalcogenide glass fibers are prepared by the existing optical fiber hot drawing method is solved, and the problem of single structure, limited materials, uncontrollable core-cladding ratio, and high cost caused by high use amount of chalcogenide glass when chalcogenide glass fibers are prepared by the existing double crucible method is solved.

The invention discloses a tunneling effect of artificial surface plasmon and a working method thereof. The tunneling effect is composed of a rectangular waveguide, a transition waveguide, a plasma waveguide supporting artificial surface plasmon, and a tunneling channel filled with zero equivalent dielectric constants. The rectangular waveguide, the transition waveguide, and the plasma waveguide are connected in sequence and are arranged in a symmetric mode along the tunneling channel. The upper metallic part of the rectangular waveguide is dug out partially and metallic bars are arranged periodically at the dug part to form the transition waveguide and the plasma waveguide. The artificial surface plasmon excited by the plasma waveguide can be extruded into the channel and passes through the channel in a tunneling manner. According to the invention, the tunneling effect is not affected by the geometrical shape of the channel, so that the artificial surface plasmon transmission distance can be increased further and the transmission direction of the artificial surface plasmon can be changed randomly.

The invention relates to a cable structure capable of reducing a cable skin effect during high-frequency power transmission, a flexible direct-current power transmission technology and the field of offshore wind power and electric energy high-frequency transmission. The cable structure is composed of a direct-current positive wire, an insulating layer 1, an alternating-current layer, an insulatinglayer 2, an armored grounding layer and a PP layer, wherein direct-current voltage is applied to the direct-current positive wire layer, alternating-current voltage is applied to the alternating-current layer, and direct current passes through the direct-current positive wire layer and alternating current passes through the alternating-current layer. According to the invention, large loss causedby a skin effect generated during high-frequency power transmission of the alternating-current cable can be adjusted and improved through an electric field created by direct current, so that the purpose of low loss and long distance of high-frequency power transmission is achieved, and the alternating-current and direct-current comprehensive operation complements each other.

The invention relates to a multi-slit coupling directional coupler based on integrated substrate gap waveguides. The multi-slit coupling directional couplercomprises two integrated substrate coupling gap waveguides with the same structure, and is characterized in that each integrated substrate coupling gap waveguide comprises a via hole layer dielectric plate and a gap layer dielectric plate, a first metal ground layer is printed on the upper surface of the via hole layer dielectric plate, a first coupling microstrip line and a first circular metal patch are printed on the lower surface, the first coupling microstrip line comprises a first rectangular section and a first linear section, a second coupling microstrip line is printed on the upper surface of the gap layer dielectric plate, a second metal ground layer is printed on the lower surface, the second metal ground layer is provided with a plurality of coupling gaps, the second coupling microstrip line comprises a second rectangular section and a second straight line section, the coupling gaps are located under the second rectangular section, the lower surface of the via hole layer dielectric plate is tightly attached to the upper surface of the gap layer dielectric plate, and the two integrated substrate coupling gap waveguides of the same structure are oppositely arranged after rotating by 180 degrees. According to the invention, wide bandwidth and high isolation can be realized at the same time.

The invention discloses an efficient petroleum pipeline heat exchange device. The efficient petroleum pipeline heat exchange device comprises a boiler, a petroleum pipeline and a heat dissipation spiral pipe, wherein a liner is mounted in the boiler; an electromagnetic coil is wound at the outer side of the liner; the bottom of the boiler is connected with a circulating pump through a second liquid conveying pipeline; a petroleum pipeline is arranged at one side of the boiler; the heat dissipation spiral pipe is mounted in the petroleum pipeline; a water inlet is formed in one end of the heatdissipation spiral pipe and a water outlet is formed in the other end of the heat dissipation spiral pipe; a condensation coiled pipe is mounted at the outer side of the petroleum pipeline; the condensation coiled pipe is connected with the boiler through a steam pipeline; a temperature sensor is mounted on the surface of the petroleum pipeline; a temperature probe is mounted at an output end of the temperature sensor. According to the efficient petroleum pipeline heat exchange device disclosed by the invention, the boiler, the circulating pump, the heat dissipation spiral pipe, the condensation coiled pipe, the electromagnetic coil and a water returning pipeline are arranged so that the problems of low heat exchange efficiency and high energy loss are solved.

The invention relates to the technical field of vibrating screening, and discloses a vibrating screening machine for refractory material production. The vibrating screening machine comprises a vibrating box, wherein a feeding port is formed in the top end of the vibrating box; a motor is fixedly connected to the outer part of the right side wall of the vibrating box; a second damping spring is fixedly connected to the bottom of the motor; a drainage plate is arranged on the right side wall of the vibrating box; an output shaft is fixedly connected to the left side of the motor; the other end of the output shaft extends into the vibrating box; and a connecting rod is fixedly connected to the left side of the output shaft. According to the vibrating screening machine, a first spring, the connecting rod and a screening plate are arranged in a matched mode, so that the motor directly drives the screening plate to vibrate, and the effects of energy conservation and noise reduction are achieved; and meanwhile, a second spring, an electromagnet and a magnet are arranged in a matched mode, so that a first screening plate shakes left and right in the horizontal direction, the effect that materials accumulated in the middle of the screening plate are uniformly dispersed towards the two sides is achieved, and the problems that in the prior art, the screening efficiency is poor and the loss of the screening plate is high due to the fact that the materials are accumulated in the middle of the screening plate are solved.

The invention provides a relay control circuit. The relay control circuit includes a power supply module, an absorbing module, a reset module, a control module, a first driving module and a second driving module, wherein the power supply module outputs a power signal; the absorbing module absorbs the peak leakage inductance voltage generated when a coil is turned off; the reset module reduces thecurrent passing by the coil and the peak leakage inductance energy generated when the coil is turned off after the relay is started, so as to reset the coil; the control module outputs a first switchcontrol signal and a second switch control signal; the first driving module turns on the coil according to the first switch control signal to control the start of the relay, and is turned off according to the first switch control signal after the relay is started; the second driving module is activated according to the second switch control signal after the relay is started, so as to enable the relay to maintain in a working state; and after the relay is started, the current passing by the coil is controlled to be reduced through the second driving module and the reset module to maintain the startup state, thereby saving the energy being unnecessary to consume after the relay is started.

The invention belongs to the technical field of multi-material and multi-structure mid-infrared optical fiber preparation, and more specifically relates to a low-cost batch preparation method and system for mid-infrared optical fiber with adjustable materials and structures. The shape of the fiber is controlled through the structural design of the crucible, and the initial preform is prepared by the double-crucible method, and the initial preform is used as the basic structure, combined with the high-performance polymer film winding method to prepare a multi-material, multi-structure mid-infrared optical fiber prefabrication Rods, and a batch of highly flexible multi-material, multi-structure, low-loss mid-infrared optical fibers prepared by hot drawing method, thus solving the problems of core-clad interface defects, impurity introduction and The preparation process is cumbersome, and the existing double-crucible chalcogenide glass optical fiber has a single structure, limited materials, uncontrollable core-cladding ratio, and high cost caused by a high amount of chalcogenide glass.

The invention discloses a preparation method of a radio frequency chip type multilayer ceramic capacitor. The preparation method comprises the following steps: S1, carrying out tape casting on high-frequency ceramic slurry to form a ceramic medium; S2, printing copper electrode slurry on the ceramic medium to prepare a laminated body; S3, removing glue from a ceramic medium film in air at the temperature of 450 DEG C or below, grinding the ceramic dielectric film into powder, and sintering the powder to obtain film powder; S4, discharging glue from the laminated body, scattering a layer of uniform film powder to the bottom and the surface of the laminated body during glue discharging, and the glue discharging mode being air glue discharging or nitrogen glue discharging; S5, sequentially sintering and chamfering the laminated body to obtain the radio frequency ceramic chip; and S6, coating the two ends of the radio frequency ceramic chip with Cu external electrode slurry, then burning the end, and carrying out electroplating to manufacture an external electrode, thereby obtaining the radio frequency chip type multilayer ceramic capacitor. According to the invention, the problem thatan existing nickel electrode sheet type multilayer ceramic capacitor cannot meet the performance requirement of working at a higher frequency is solved, and the problem that the cost is high becausethe silver / palladium sheet type multilayer ceramic capacitor adopts noble metal materials as the inner electrode and the end electrode is solved.

One embodiment of the invention discloses a low-loss digital phase shifter, which comprises an input unit, a 180-degree phase shifting unit, a 90-degree phase shifting unit, a 45-degree phase shiftingunit, a 22.5-degree phase shifting unit and an output unit, and is characterized in that the 180-degree phase shifting unit, the 90-degree phase shifting unit, the 45-degree phase shifting unit and the 22.5-degree phase shifting unit are connected in series. According to the low-loss digital phase shifter, the transmission loss is effectively reduced, the isolation degree and the power capacity between branches are improved, the phase shifter can achieve high-precision phase shifting within the whole working frequency range, the problem that a traditional digital phase shifter is high in lossis well solved, and the low-loss digital phase shifter has high reliability and can be used for engineering practice.

The invention discloses a transmission line transformer with a non-integer square transformation ratio, which comprises a winding type transformer T1 with an impedance transformation ratio of 1: N2 and a melon inner pull type transformer T2 with an impedance transformation ratio of 4: 1, and N is an integer greater than or equal to 2; each of the winding type transformer T1 and the melon inner pull type transformer T2 is provided with a low-impedance port and a high-impedance port; a low-impedance port of the winding type transformer T1 is connected in parallel with a high-impedance port of the melon inner pull type transformer T2, and a total external low-impedance port of the transmission line transformer is formed after the parallel connection of the low-impedance port of the winding type transformer T1 and the high-impedance port of the melon inner pull type transformer T2; a high-impedance port of the winding type transformer T1 is connected in series with a low-impedance port of the melon inner pull type transformer T2, and a total external high-impedance port of the transmission line transformer is formed after series connection. According to the non-integer square impedance transformation ratio transformer, the impedance transformation ratio step pitch is refined, meanwhile, single-end-differential (balanced) impedance conversion can be achieved, the structural size is compact, and impedance transformation ratio switching is flexible.

Embodiments of the present invention provide a dual-stator motor, a motor control system and a control method. The dual-stator motor includes a first stator assembly, a second stator assembly, a rotor assembly, and a motor control unit; wherein the winding of the first stator assembly adopts a circular The winding of the second stator assembly adopts flat wire; the rotor assembly is fixed on the output shaft of the motor and passes through the first stator assembly and the second stator assembly; the motor control unit is connected with the first stator assembly and the second stator assembly The electrical connection is used to control the first stator assembly to drive the rotor assembly to drive the output shaft to rotate, so that the motor operates at a high speed; or, to control the second stator assembly to drive the rotor assembly to drive the output shaft to rotate, so that the motor operates at a low speed In this case, when the frequency of the alternating current of the motor is high, the problem of high loss caused by the skin effect of the flat wire winding is solved, and the performance of the motor is improved.

The invention provides a control method and a control device of a charging pile and a charging system. The control method comprises the following steps: detecting whether the charging pile receives a charging request or not; detecting whether the charging gun is in a preset position or not, wherein the preset position is a fixed position where the charging gun is in an unused state; and when the charging pile does not receive the charging request and the charging gun is located at the preset position for preset time, controlling the charging pile to enter a first sleep mode so as to reduce the power consumption of part of modules of the charging pile. According to the control method, by detecting whether the charging pile receives a charging request and whether the charging gun is located at a preset position or not and detecting whether the charging pile does not receive the charging request and the charging gun is located at the preset position for preset time, that is, it is determined that the charging pile is not used within the preset time, the charging pile can be controlled to enter a first sleep mode; therefore, the power consumption of partial modules of the charging pile is reduced, and the problem of high electric quantity loss of the charging pile in the prior art is solved.

The invention discloses a dielectric resonator antenna array for generating vortex electric waves. The antenna array is composed of N dielectric resonator antennas evenly arranged on the circular printed board (ground plane side), and N rectangular slots are opened at the connection between the dielectric resonator antenna and the ground plane; There are N uniformly distributed microstrip lines, N≥4, one end of the microstrip line is fed by the coaxial line, and the other end is fed by the dielectric resonator antenna through the coupling with the rectangular slot. Thus, N‑1 modes of vortex electric waves (OAM waves) are generated. The dielectric resonator antenna array of the invention has the advantages of high gain, low loss and high broadband.

The invention discloses a surface acoustic wave filter. The surface acoustic wave filter comprises a piezoelectric substrate, a plurality of resonators, and a plurality of coupling capacitors, wherein the resonators and the coupling capacitors are integrated on the piezoelectric substrate; the coupling capacitors are connected in series between the input port and the output port; the resonator is connected in parallel between a connection node of the coupling capacitor and a ground potential; and the coupling capacitor and the resonator are connected in series, in parallel and the like to form the surface acoustic wave filter, transmission of specific frequency signals is completed, and the function of the filter is achieved. Herein, a plurality of coupling capacitors are connected in series in the filter, so that the problem of high loss caused by series connection of a plurality of resonators in a conventional filter is solved; the coupling capacitors are relatively easy to prepare, the process difficulty is reduced, the size of the coupling capacitors is smaller than that of conventional resonators formed by interdigital electrodes and reflecting gratings, and miniaturization is facilitated.

The invention relates to a micro element feeder. The micro element feeder comprises a shell; a conveying paper tape for transferring a micro element is arranged above the interior of the shell; a supporting plate which extends in the conveying direction of the paper tape and is used for supporting the conveying paper tape is also arranged in the shell; a material frame used for mounting a paper roll is arranged on one side of the shell; a row of conveying holes and a row of micro element placement grooves are formed in the conveying paper tape; the conveying holes and the placement grooves areall extended and arranged in the conveying direction of the conveying paper tape in sequence at equal intervals; conveying gears which rotate at intervals are arranged in the shell; the rotation direction of the conveying gears is the same as the conveying director of the conveying paper tape; the tooth tips of the conveying gears are inserted in the conveying holes of the conveying paper tape insequence for conveying the paper tape forwardly in a manner of uniform velocity and equal intervals; a micro element adsorption apparatus is arranged above the placement grooves; and in the conveyinggaps, the adsorption apparatus adsorbs and conveys the micro element. By virtue of multiple groups of gears for transmission, smoothness and stability of the conveying process are ensured.

The invention relates to a coupler based on a substrate-integrated gap waveguide. The coupler structure is formed by tightly connecting an upper dielectric plate (5) and a lower dielectric plate (6). The upper surface of the upper dielectric board (5) is printed with a grounded metal layer, and the lower surface is printed with coupled microstrip lines (13); the upper surface of the lower dielectric board (6) is printed with periodic circular metal patches (9), ( 15) and H-type coupled microstrip line (12), the lower surface is printed with a metal layer, and periodic metal via holes (10), (11), (14) are punched on the lower dielectric board (6). The invention has the advantages of easy integration, small size, wide bandwidth, low loss, high isolation and the like.

The invention discloses a SiC device current source type dual three-phase permanent magnet synchronous motor drive system using soft switching technology. The system includes: two motor stator winding ports located on the side of the dual three-phase permanent magnet synchronous motor, two current Source type inverter, two three-phase filter capacitors, DC bus inductance, power supply side chopper, voltage source, zero voltage switch auxiliary circuit; method includes: including control process of current source type inverter one, current source type The control process of the inverter 2 and the control process of the soft switch. The multi-phase winding is fed by two series-connected current source power converters, which improves the reliability and fault tolerance of the motor drive system. At the same time, soft switching technology and active damping technology are adopted to make the SiC device switch flexible and suppress It solves the electromagnetic interference problem caused by the high-frequency operation of SiC devices, improves the performance of the motor drive system, and has the advantages of small torque ripple and strong fault tolerance.

An embodiment of the present application discloses a low-loss digital phase shifter, the phase shifter includes: an input unit, a 180° phase shift unit, a 90° phase shift unit, a 45° phase shift unit, a 22.5° phase shift unit, and The output unit, wherein each phase shift unit is connected in series, and the cascade sequence is: 180° phase shift unit, 90° phase shift unit, 45° phase shift unit and 22.5° phase shift unit. This application proposes a low-loss digital phase shifter, which effectively reduces transmission loss and improves isolation and power capacity between branches. It solves the problem of high loss of traditional digital phase shifters, has high reliability, and can be used in engineering practice.

The low-profile dielectric antenna comprises a low-profile radiation patch structure, a middle-layer dielectric substrate and a bottom-layer dielectric substrate which are sequentially arranged from top to bottom, gap structures are arranged on the two opposite end faces of the low-profile radiation patch structure, silver coatings are arranged in the gap structures, and the silver coatings are arranged on the middle-layer dielectric substrate and the bottom-layer dielectric substrate. A metal bottom plate plane layer is arranged between the middle-layer dielectric substrate and the bottom-layer dielectric substrate, a linear coupling gap is formed in the middle of the metal bottom plate plane layer, a microstrip feeder line structure is arranged at the bottom of the bottom-layer dielectric substrate, the metal bottom plate plane layer and the microstrip feeder line structure form a feed structure, and the metal bottom plate plane layer is connected with the microstrip feeder line structure. The antenna has the characteristics of miniaturization, low power consumption and temperature stability.

The invention discloses an automatic forming device for a bendable plastic straw. The automatic forming device comprises a rack, wherein a working face is arranged on the rack, a hopper assembly usedfor feeding and a material collecting assembly used for collecting materials are arranged at two ends of the rack correspondingly, a material taking assembly used for taking materials is arranged on the rack, a material collecting hopper is connected to the material collecting assembly, a guide rail assembly is arranged on the working face, the guide rail assembly extends in the direction of a connecting line between the hopper assembly and the material collecting assembly, a molding assembly used for molding a bent pipe is arranged on the guide rail assembly, and the molding assembly is located between the hopper assembly and the material collecting assembly and can mold the bent pipe while doing reciprocating motion between the hopper assembly and the material collecting assembly. According to the device, straw bulges are reduced, loss of molding needles is reduced, molding parameters can be rapidly adjusted for the straws with different pipe diameters, and the yield of products is increased.