109results about How to "Increase the number of levels" patented technology

The invention discloses a uniform electricity quality regulator based on a T-type three-level inverter. The uniform electricity quality regulator based on the T-type three-level inversion technology and a control method of the uniform electricity quality regulator resolve the problem about the electricity quality of a micro power grid. A source and load detection device is used for detecting the real-time conditions of a power source and a load of the micro power grid; a serial-connecting inverter is used for being connected between the power source and the load in series; a parallel-connecting inverter is used for being connected on the load side in parallel; a direct current side energy-storing unit is used for storing energy; a Hall sensor is used for measuring the current and voltage information output by the inverters; an analog acquisition unit converts analog signals into a digital quantity through an external AD in a concentrating mode; a main digital controller is used for achieving the functions of operating state judgment, data analysis and the like; and a driving circuit is used for achieving output of PWM signals and protection over fault hardware. According to a control strategy of a T-type three-level inverter UPQC, a modified quasi proportional resonant current control strategy and a neutral-point voltage balance control strategy of PWM pulse optimizing switchover are provided.

The invention discloses a method for slicing heavy leather blade paraffin and relates to a method for slicing plant paraffin. Operating procedures include fixing, dehydrating, transparentizing, paraffin infiltration, embedding, slicing, dewaxing, dyeing and mounting. In the splicing process of the heavy leather blade paraffin, a fixing agent, a dehydrating procedure, a transparentizing procedure, a paraffin infiltration method, a dyeing method and mounting are improved, i.e., selection of the fixing agent, determination of the dehydrating procedure, determination of the transparentizing procedure, determination of the dewaxing procedure, the dyeing method and the mounting method are improved. The method is also suitable for other blades with different thicknesses and properties. By adopting the method, slice manufacturing of blade paraffin with different thicknesses and properties can be realized practically, and a uniform and practical manufacturing method for theoretical manufacturing of paraffin is popularized.

The invention relates to a low-power rapid-boost FLASH charge pump control circuit. The low-power rapid-boost FLASH charge pump control circuit comprises a programming erase control circuit, a voltage regulating circuit, a voltage reducing circuit, a clock generating circuit, a four phase clock circuit, a charge pump and a voltage stabilizing circuit. The voltage reducing circuit is divided into two paths, one path is used for quick start and works when the output voltage of the charge pump is low, the other path is used for the voltage trimming of the charge pump and works when the output voltage of the charge pump approaches a target value, and the voltage reducing circuit reduces the voltage through a reverser biased diode and a forward biased diode in order to reduce power consumption; the clock generating circuit is used for generating a clock required by the work of the charge pump, the frequency of the clock is adjustable, and in the early start stage, the clock runs in a fastest frequency within an adjustable range, and the voltage of the charge pump fast rises; and when the voltage of the charge pump approaches the target value, the clock frequency is trimmed according to the feedback voltage of the charge pump in order o maintain the voltage of the charge pump in a reasonable range. The control circuit reduces the power consumption of a Flash memory and increases the programming erasing speed of the Flash memory.

The invention relates to a domestic sewage treatment method, in particular to a method for realizing a terrace type composite vertical flow forest wetland on a hillside land and applying the forest wetland to rural domestic sewage treatment. The method is characterized by comprising the following steps that: a hilly hillside land is changed into a terrace; the terrace is constructed to be a terrace type composite vertical flow constructed wetland 3; plants and fillers of the terrace wetland 3 are the same as those of the conventional constructed wetland, but an upper level of the terrace wetland 3 is communicated with a lower level of the terrace wetland 3 through a forest surface flow wetland 4; and sewage is over-flown into the forest surface flow wetland 4 through downward flow wetland 31 and upward flow wetland 32 of the upper level of the terrace wetland 3, and enters the next level of the terrace wetland 3 for further treatment through the forest surface flow wetland 4. The invention has the advantages of high purification rate and adaptability, convenience of management, low cost, is easy to implement and is particularly suitable for rural domestic sewage treatment in hilly areas.

The invention relates to a power line carrier type meter reading and networking test system. The power line carrier type meter reading and networking test system comprises a concentrator inlet unit and at least one carrier electric energy meter unit, wherein the concentrator inlet unit comprises a main inlet socket, a main switch, an isolation transformer, a first carrier attenuator, a concentrator and a first connector bar which is connected with each circuit inside the concentrator inlet unit; the carrier electric energy meter unit comprises a carrier attenuator, carrier electric energy meters and a connector bar connected with each circuit inside the concentrator inlet unit; a test connection wire between the concentrator inlet unit and each carrier electric energy meter is connected through the first connector bar and the connector bar. By arranging the concentrator inlet unit as a main body and the plurality of carrier electric energy meters, the power line carrier type meter reading and networking test system realizes experiment research of a single-phase power line carrier networking. Furthermore, the connection is realized by the connector bar in a junction box of a rear panel or network topology connection required by the test is realized through a wiring jack on a front panel, so that a user can conveniently wire and the circuits are clean in an experiment field.

The invention relates to a view tower type device for water aeration and biological purification. The structure of the view tower type device is a tower type structure, and the device comprises a water outlet 1, a spill pit 2 and an outlet channel 5, wherein the water outlet 1 is formed at the center of the spill pit 2, and the outlet channel 5 is communicated with the water outlet 1; a plurality of functional layers are arranged to surround the spill pit 2, each functional layer comprises a biological ball purification region 3 and a landscape aquatic plant region 4, and the landscape aquatic plant region 4 is arranged to surround the biological ball purification region, one end of the spill pit 2 is connected with a water duct 7, and a water pump 6 is mounted at the other end of the water duct 7. The view tower type device has the advantages that the dissolved oxygen concentration in sewage is improved by virtue of free wall fall, and a biological enhanced treatment function is added so that the treatment efficiency of constructed wetlands can be improved obviously and the water quality of the sewage plant effluent can be improved. Compared with existing techniques, the landscape functions of the constructed wetlands are not damaged, and the landscape effect of the constructed wetlands and the sewage plants also are added. In addition, the view tower type device for water aeration and biological purification is simple in structure, low in construction cost and convenient to repair.

The invention relates to a treatment method of waste papermaking water, which comprises the steps of filtration, flocculation and sedimentation, QA2O treatment and deep treatment. Because the QA2O treatment process is adopted in the treatment method of the invention for replacing the conventional biochemical treatment method, the treatment cost is greatly reduced, in addition, the treatment effect is perfect, and the technical process is simple and can be implemented easily. The method of the invention can be used for treating various kinds of waste papermaking water, particularly the middle section waste water with high load. The waste water treated by the method of the invention can reach the national specified discharge standard, or can be reused in the papermaking process.

The invention discloses a topology structure of a multi-level T-shaped converter for realizing rectification conversion, which is characterized in that the longitudinal axle of the T-shaped converter is formed by capacitors CT1, CT2 to CTk-1, CTk, CB1, CB2 to CBk-1 and CBk (2k capacitors in all); the horizontal axle of the T-shaped converter is formed by S1, S2 to Sk-1 and Sk two-way controllable switches (k in all); a branch circuit is arranged between a node Di between an Si and an Si+1 (i equals to1,2 to k-1) and a node DTi between a CTi and a CTi+1 (I equals to 1,2 to k-1), a one-way rectification branch circuit flowing to the longitudinal axle from the horizontal axle is formed via an STk1, an STk2 to STk(2k), the other branch circuit is arranged between a node Di and a node DBi between a CBi and a CBi+1 (i equals to 1,2 to k-1), the branch is a one-way rectification branch circuit flowing to the horizontal axle from the longitudinal axle and is formed by an SBk1, an SBk2 to SBk(2k), and the direction is opposite to the direction of the branch circuit; one end of the two-way controllable switch S1 of the horizontal axle is connected with the center points of the capacitors of the longitudinal axle. A switching tube, the capacitors and the rectification branch circuits are extended to increase the level number; and the invention can be applied to a multi-phase system by single-phase circuit combination. The invention can easily increase the level number of the converter and overcome the defects of non-uniform voltage of the capacitors and the large number of the parts of the prior proposal.

The invention relates to the technology of deep processing of ganoderma lucidum spore, in particular to a method of extraction and grading purification of ganoderma lucidum spore oil by supercritical CO2, which comprises the following steps: breaking shell, granulating, palletizing and screening, extracting the ganoderma lucidum spore oil, grading depressurizing, and collecting the ganoderma lucidum spore oil in step; putting ganoderma lucidum spore powder granules into an extracting tank, introducing supercritical CO2 at the pressure of 10-30 MPa and the temperature of 35-60 DEG C; enabling supercritical CO2 dissolved with the ganoderma lucidum spore oil into a primary separating tank by the extracting tank with the pressure of 10-12 MPa and the temperature of 40-60 DEG C, and collecting in step in 0.5-1.0hr / step; and entering a secondary separating tank with the pressure of 5-7 MPa and the temperature of 40-60 DEG C through depressurizing by a valve, collecting in step in 0.5-1.0hr / step, wherein the total time is for 5-7 hr. Since the flows of grading pressurization and step-collection are adopted, the oil and the impurities can be separated online, and the purity of the oil can be improved.

The invention provides an ecological cleaning system used for river regulation, and the ecological cleaning system includes a grille pool, a regulating reservoir, a water distribution canal, constructed wetlands, a stabilization lagoon and a collecting well, which are connected in sequence; wherein, after being primarily filtered by the grille pool, the wastewater goes into the regulating reservoir to be regulated homogenously and averagely, the wastewater regulated by the regulating reservoir goes into the water distribution canal and then passes through in sequence the stair-stepping multistage constructed wetlands to be further filtered, the wastewater goes into the stabilization lagoon after being filtered by the multistage constructed wetlands to be purified, and the wastewater is discharged into a downstream water channel through the water well after being purified by the stabilization lagoon. The ecological cleaning system used for river regulation is short in cost and high in wastewater treatment efficiency, and the system beautifies the environment at the same time.

The invention discloses a sub-module redundancy configuration method and system of a modular multilevel converter. The method comprises the following steps: determining the number of fault sub-modulesin the modular multilevel converter; calculating and acquiring a capacitance reference voltage of the sub-modules of the modular multilevel converter based on the number of the fault sub-modules; obtaining a target output voltage of an upper bridge arm and a target output voltage of a lower bridge arm of the modular multilevel converter; and determining the number of sub-modules input by the upper bridge arm by utilizing the capacitance reference voltage and the target output voltage of the upper bridge arm, and determining the number of sub-modules input by the lower bridge arm by utilizingthe capacitance reference voltage and the target output voltage of the lower bridge arm. In the invention, a maximum voltage output capability is reserved by increasing a capacitor voltage so that thesystem operates stably, and a fault ride-through capability is enhanced; and loss of a converter valve is reduced, redundant modules are fully utilized, a harmonic content of an output voltage is reduced, and operation performance of the modular multilevel converter is optimized.

The invention relates to a high-efficiency high power factor charger circuit which comprises a rectification circuit, a transformer, a rectifier filter circuit, a voltage current error signal sample circuit, a photocoupler, a pulse-width modulation circuit and an N slot field-effect transistor; the charger circuit is characterized in that the pulse-width modulation circuit is a double-effect circuit for pulse-width modulation and power factor correction, and is formed by a summit current type boosting power factor correction chip and a chip peripheral circuit. The invention adopts the existing summit current type boosting power factor correction chip at the market and uses the special connecting method, so that the double-effect circuit for pulse-width modulation and power factor correction can be formed and used for replacing the pulse-width modulation circuit in the prior art, thus improving the power factor (being more than or equal to 0.95) of the whole charger circuit on the premise that the cost is not increased and the efficiency is not reduced.

A method to produce a turbomachinery impeller, which includes, at least, the following steps: creation of the impeller using a light alloy, and coating of the impeller with a nickel-plating coating.

The invention relates to an oil furnace flue gas purification compound tower integrating dust removal, smoke abatement and desulphurization, and belongs to the technical field of oil furnace flue gas purification. The tower comprises a casing, a flue gas inlet formed at the lower part of the casing, a slurry discharge port formed at the bottom of the casing, a slurry discharge pump connected with the slurry discharge port, multistage spray pipes arranged at the upper part of the flue gas inlet up and down, circulating pumps arranged in circulating pipes which are communicated with the multistage spray pipes, a demister arranged above the spray pipes, and a flue gas outlet formed at the top of the casing. The tower is characterized by further comprising an umbrella-shaped device arranged under the lowest stage of spray pipes, and one layer of pore plate arranged between the topmost stage of spray pipes and the next topmost stage of spray pipes. The tower can modify the distribution of a gas field inside, can improve the desulphurization efficiency, and can reduce the liquid-gas ratio so as to reduce the cost.

The invention discloses an optimal modulation method of a full-bridge modular multilevel converter. A bridge arm voltage of an integer input sub-module is modulated and an SAPWM modulation algorithm is provided. Carrier phases of an upper bridge arm and a lower bridge arm are adaptively adjusted by considering positive and negative conditions of a bridge arm voltage of the full-bridge modular multilevel converter under a voltage-boosting operation condition. According to a comparison result of a decimal input sub-module number and an instantaneous value of a bridge arm carrier signal, an output level of a sub-module used for outputting a voltage decimal part is controlled so that modulation of the bridge arm voltages of integer and decimal input sub-modules is realized at the same time, and a load voltage level number can be increased in a whole voltage-boosting operation fundamental wave period of the full-bridge modular multi-level converter. Total harmonic distortion rate of a loadvoltage is effectively reduced, and harmonic frequency of the load voltage is increased. Filtering cost is reduced, and method is suitable for the full-bridge modular multilevel converter under the voltage-boosting operation working condition.

The invention discloses a method for improving screw drilling tool use performance and a super screw drilling tool. The super screw drilling tool comprises a fall prevention conversion assembly, a motor assembly, a universal shaft assembly and a transmission shaft assembly, the fall prevention conversion assembly comprises a fall prevention conversion connector, a fall prevention disk and a fall prevention connecting rod, the fall prevention disk is arranged in the fall prevention conversion connector, the upper end of the fall prevention connecting rod is arranged in the fall prevention diskin a sleeving manner and fixed through a tightening nut, and the other end of the fall prevention connecting rod is connected with the upper end of a rotor of the motor assembly. The super screw drilling tool is simple in structure, safe and reliable, rotating and drilling functions of a conventional screw drilling tool and a directional drilling function of a bent shell can be achieved, the superscrew drilling tool is particularly applicable to well drilling occasions of supra-maximal discharge capacity, torque and drilling pressure and ultra-high compound rotating speed under high bending deflection (namely a short-radius drilling tool), the super screw drilling tool has service life equivalent to a conventional screw, the application range of the screw drilling tool is greatly widened,and well drilling speed can be effectively improved.

The invention discloses a topology structure used for a multi-level T-shaped converter, which can achieve rectifier conversion and is characterized in that the longitudinal axis of the T-shaped converter consists of 2k capacitors such as CT1, CT2, and to CTk-1, CTk, CB1, CB2, and to CBk-1 and CBk; the transverse axis of the T-shaped converter consists of k bidirectional controllable switch such as S1, S2, and to Sk-1 and Sk; a branch is arranged between nodes Di of Si and Si+1 (i is equal to 1, 2, and to k-1) and nodes DTi of CTi and CTi+1 (i is equal to 1, 2, and to k-1); a unidirectional rectifier branch flowing from the transverse axis to the longitudinal axis consists of STk1, STk2, and to STk2k; another branch is arranged between the nodes Di, CBi>and CBi+1 (i is equal to 1, 2, and to k-1); the branch is a unidirectional rectifier branch which flows from the longitudinal axis to the transverse axis and consists of SBk1, SBk2, and to SBk2k, with the direction reverse to the previous branch; one end of the bidirectional controllable switch S1 is connected with the middle point of the longitudinal axis capacitor. Number of levels can be increased by extending switch tubes, capacitors and rectifier branches; single-phase circuit combination can be applied to multi-phase systems. The topology structure can easily improve the number of levels of the converter and overcome the shortages that the capacitor of the prior art has non-uniform voltage and large quantity of devices.

The invention discloses a high-integration flywheel energy storage device with a novel horizontal self-vacuum chamber. A vacuum chamber is formed through a casing, an upper end of the vacuum chamber is a three-degree-of-freedom magnetic bearing fixedly connected with the casing by a bracket, which includes a radial magnetic bearing, an axial magnetic bearing and a permanent magnet, a lower end ofthe three-degree-of-freedom magnetic bearing is a flywheel rotor, a single-winding outer rotor bearingless motor is located at a lower end of the flywheel rotor, a rotor of the motor is mounted in anannular groove at a lower surface of the flywheel rotor, and a stator is fixed to a lower end of the casing by a bracket. The device is advantaged in that five-degree-of-freedom balance of the flywheel rotor is realized by the three-degree-of-freedom magnetic bearing combined with the single-winding outer rotor bearingless motor, a control mode is simplified, the integration degree is improved, ahorizontal composite vacuum pump is arranged at an upper end of the casing, a vacuum pump is a double-rotor structure which is mirror-symmetrical to the left and right, and the vacuum degree and the pumping speed are improved.

The invention discloses a biologically enhanced three-dimensional landscape artificial wetland system. The biologically enhanced three-dimensional landscape artificial wetland system is of a three-dimensional structure, and comprises an overflow pool, an overflow weir, guide plates, a water outlet channel, a water pump, a water pipe, a purification layer and a grating; the purification layer comprises an artificial wetland and a biological ball purifying area, and at least one purification layer is arranged; the grating is arranged on one side of the purification layer; the overflow pool is located at the top end of the three-dimensional structure; the water pump is connected with the overflow pool by use of the water pipe; the overflow weir is arranged on one side of the overflow pool; the guide plates are arranged to surround the overflow weir and connected with the next purification layer; the bottommost purification layer is connected with the water outlet channel. The biologically enhanced three-dimensional landscape artificial wetland system is integrated with artificial wetland purification, biological ball enhanced treatment, drop aeration, seepage-proofing and visual beauty; a plurality of such systems can be connected in parallel or in series to operate, and therefore, the treatment efficiency of the artificial wetland is greatly improved and the floor area of the artificial wetland is reduced to a certain extent. The biologically enhanced three-dimensional landscape artificial wetland system can be widely applied to the fields of domestic sewage treatment in vast rural areas, sewage plant tail water deep treatment and the like.

The invention relates to a suspension packer with full-bore low setting pressure, a return plug and a construction process. The suspension packer includes a mandrel assembly, wherein one end of the mandrel assembly is connected with a return barrel assembly for realizing a full bore; a hydraulic assembly for providing setting pressure is arranged on the other end of the mandrel assembly. The return barrel assembly is arranged on the upper portion of the suspension packer and used for being connected with delivery tools and connected with the return plug when returning, so that the full bore ofthe suspension packer is realized, prerequisites are provided for the secondary and subsequent operation of an oil and gas well to ensure the smooth progress of the secondary-level follow-up operation, and the number of stages of a ball injection sliding sleeve staged fracturing process is increased; the suspension packer can be used cooperatively with the high-strength special delivery tools toensure the safety of the tools into the well; and the hydraulic assembly is used to reduce the full setting pressure so that the problems that the pressure level of the surface pipeline of part of drilling teams is low and pump trucks for ground construction cannot achieve high pressure can be solved.

The invention discloses a miniaturized impact hammer with low driving voltages. The miniaturized impact hammer is composed of such six portions: a cylindrical impacter, a beam for storing energy, a reduction gear set, a locking mechanism, a micro slider-crank mechanism and a comb-shaped driver. The beam and a spring body are used for storing energy, compared to a single locking structure, the reduction gear set is additionally arranged, a bull gear and a pinion gear are nested to each other, the pinion gear drives the bull gear, the reference circle radius of the pinion gear is r, the reference circle radius of the bull gear is R, and the driving force of the pinion gear is r / R of resistance of the bull gear. At the same time, under multistage gear set effects, the driving force of the pinion gear can be greatly reduced. According to the invention, through the effect of an electrostatic force, the comb-shaped driver is enabled to generate horizontal transverse displacement, through themicro slider-crank mechanism, the horizontal transverse displacement is converted into circumferential motion to drive the gear set to run so as to drive the hammer of the impacter to store and release the energy, the driving force is greatly reduced, and the energy is stored and released under the driving effects of small voltages.

The invention discloses a clock processing method suitable for multistage cascaded radio remote unit, which comprises: (a) an optical interface clock recovers a clock signal CLK0 acquired in data received from a baseband module or an upper-stage radio remote unit according to the radio remote unit; and (b) a hard phase-locked loop PLL1 takes the acquired clock signal CLK0 as a reference clock and outputs a clock signal CLK1 as a clock signal of an optical interface transmission clock of the radio remote unit, and the optical interface transmission clock transmits the received clock signal to the next radio remote unit; and a soft phase-locked loop PLL2 inputs the acquired clock signal CLK0 as a reference clock and outputs a clock signal CLK2 as a local reference clock according to a soft phase-locked algorithm. The method and the device can acquire optimization of indexes of clock accuracy and phase noise.

A solar inverter circuit comprises a boost circuit, a high-frequency chopper circuit, an inverter circuit and a controller. An input terminal of the boost circuit is connected with a positive electrode of a solar cell, and an output terminal of the boost circuit is connected with a first input terminal of the high-frequency chopper circuit. The first input terminal of the high-frequency chopper circuit is connected with the output terminal of the boost circuit, the second input terminal of the high-frequency chopper circuit is connected with the input terminal of the boost circuit, and the output terminal of the high-frequency chopper circuit is connected with the input terminal of the inverter circuit. The input end of the inverter circuit is connected with the output end of the high frequency chopper circuit, and the output end of the inverter circuit is connected with the mains. As that second switch tube is provided between the solar cell and the first inductance, that voltage ofthe solar cell is high than the mains voltage, the boost circuit is not required to boost the voltage of the solar cell and then supplied to the inverter circuit, but the pow of the solar cell is directly supplied to the inverter circuit through the second switch transistor, thereby improving the energy conversion efficiency.

The invention discloses a high-frequency ultra-short electron gun grid regulation and control pulse power supply system, which mainly comprises the following four schemes: a high-frequency ultra-shortelectron gun grid regulation and control pulse power supply system for generating voltage-multiplying pulses, a high-frequency ultra-short electron gun grid regulation and control pulse power supplysystem for directly generating high-frequency ultra-short pulses, a high-frequency ultra-short electron gun grid regulation and control pulse power supply system for generating frequency-multiplying and phase-adjustable pulses, and a high-frequency ultra-short electron gun grid regulation and control pulse power supply system for directly generating polarity and phase-adjustable pulses. Output ofvoltage-multiplying pulses, high-frequency ultra-short pulses, frequency-multiplying and phase-adjustable pulses and polarity and phase-adjustable pulses is realized respectively.

The invention discloses a direct current power supply, which comprises a rectifying unit, an inverter unit, an output rectifying unit, a detection unit and a DSP processor, wherein the detection unit is arranged at the downstream of the output rectifying unit to detect a voltage transmitted by an output filter unit to a load and transmits a detected value to the DSP processor; and the DSP processor is arranged between the detection unit and the inverter unit to output a corresponding PWM control signal according to the detected value of the voltage of the load and an expected value input in advance of the load to the inverter unit to control the on and off of a switch element in the inverter unit and to adjust the dutyfactor of the switch element in the inverter unit to adjust the output voltage of the inverter unit to allow to the detected value of the load to approach the expected value of the voltage of the load. The output voltage of the direct current power supply is high in quality and small in harmonic content and interference, so the direct current power supply meets the electricity use requirements of precise instruments and effectively avoids damages to the precise instruments caused by power supply quality.

The invention belongs to the technical field of antenna measurement, and discloses a three-dimensional vector directional diagram acquisition method which comprises the following steps: acquiring thepartition geometric model of a measurement probe; the electric field distribution on the sphere surrounded by the near region is calculated by using the high-order moment method based on the partitiongeometric mode; and the three-dimensional vector directional diagram of any point in the far field of the probe is obtained by spherical near-far field transformation based on the electric field distribution. The method capable of reducing the calculation amount under the condition of ensuring the accuracy of the three-dimensional vector directional diagram is provided.

The invention provides a multiphase filtering-based continuous wave radar receiver. The receiver is composed of a receiving front-end circuit, a baseband differential conversion and operational amplification circuit, an RC poly-phase filtering network and a baseband synthesis circuit; the RC multiphase filtering network is used to realize mirror image signal suppression of a zero-intermediate frequency receiver; a passive differential conversion network and differential operational amplification are adopted to realize the amplitude and phase balance of the input signals of the RC multiphase filtering network and improve the degree of the mirror image signal suppression; a passive filter, the passive differential conversion network and an ultra-low noise operational amplifier are adopted toimprove the sensitivity of a system; the number of stages of the RC multiphase filtering network is increased, so that the expansion of baseband bandwidth and the improvement of the mirror image signal suppression can be realized; and the frequency range of the system can be extended through the frequency selection of the front-end circuit. The mirror frequency suppression and high sensitivity ofthe continuous wave radar zero-intermediate frequency receiver can be realized with low cost and high integration level.

The invention relates to a preparation method of PIPD (poly[2,6-diimidazo-(4,5-b:4'5'-e)pyridinylene-1,4-(2,5-dihydroxy)phenylene]) fiber and belongs to the technical field of preparation of high-performance fiber. The PIPD fiber is obtained through air gap stretching, cooling in a quenching chamber, phosphoric solution curing, washing, multi-level gradual drying, heat treatment and coiling of a PIPD / PPA (polyphthalamide) liquid crystal solution. According to the method, the drawing rate of as-spun fiber can be stably controlled; meanwhile, most of PPA in the as-spun fiber can be rapidly and effectively removed; moisture in the as-spun fiber of PIPD can be slowly removed, and high-performance PIPD fiber with a good structure is obtained.