239results about How to "Reduce the number of series" patented technology

The invention discloses a rotary knocking gas turbine. The rotary knocking gas turbine comprises a gas inlet passage, a diffusion section and a gas storage chamber which are connected in sequence from left to right, wherein a gas compressor is arranged at the downstream of the gas inlet passage; a rotary knocking combustion chamber is positioned at the right end of the gas storage chamber, the right end of the rotary knocking combustion chamber is connected with a mixing chamber, a turbine and an exhaust pipe in sequence, a plurality of nozzles are annularly arranged on the left end face of the rotary knocking combustion chamber at equal intervals, and six ignition plugs are uniformly arranged on the circumference of the rotary knocking combustion chamber; an air passage and a combustion passage are arranged on each nozzle, the gas storage chamber is communicated with the rotary knocking combustion chamber through a gas supply passage and the air passages of the nozzles, and the mixing chamber is communicated with the gas storage chamber through a gas escape bypass; a rotor is arranged between the gas compressor and the turbine, the gas compressor of a rotating component of the gas turbine and the turbine are connected with a casing of a static bearing component of the gas turbine through two bearings, and one end of the rotor is led out from the gas exhaust pipe. When the rotary knocking gas turbine is used, the leading-out end of the rotor is connected with a generator assembly through a speed changer.

The present invention relates to an IGBT-based hybrid high-voltage direct-current circuit breaker. The IGBT-based hybrid high-voltage direct-current circuit breaker comprises a current-carrying branch, a commutation branch, a buffer capacitor, an energy-absorbing branch and a lighting arrester which are connected in parallel with one another; the current-carrying branch comprises a first mechanical switch (1) and auxiliary direct-current switches, wherein the first mechanical switch (1) is connected in series with the auxiliary direct-current switches; the commutation branch comprises a diode bridge valve capable of realizing current bidirectional conduction; the commutation branch further comprises a second mechanical switch (2) and an IGBT valve which are connected in series with each other, wherein the IGBT valve is formed by connecting a plurality of IGBT branches in parallel; after current is transferred from the current-carrying branch to the commutation branch, the second mechanical switch (2) is controlled to be switched off, and after the second mechanical switch (2) achieve a preset rated opening distance, the IGBT valve is turned off; the energy-absorbing branch comprises third isolation switches and an energy-absorbing resistor which are in series connection; and a current limiting inductor is connected in series at the outlet of the circuit breaker. With the IGBT-based hybrid high-voltage direct-current circuit breaker of the invention adopted, the number of the solid-state switch IGBTs in series connection can be reduced, and the rising rate of voltage at two ends of the circuit breaker during a breaking process can be decreased.

The invention provides a hybrid type rapid direct current breaker, comprising: a main flow branch, a current transferring branch and an energy consumption branch. All are connected in parallel. The main flow branch comprises a rapid mechanical switch unit and a main branch sub-module unit. The two units are in series connection. The current transferring branch comprises valve module units in successive cascade connection with each valve module unit comprising a plurality of semiconductor modules in series connection. The energy consumption branch comprises energy consumption components in successive cascade connection. According to the invention, the design of the breaker structure is such a design featuring the electrical topology corresponding to modularization. This means that for the application requirement of different voltage grades, the structure can be expanded to do so. As the breaker adopts a single platform supporting structure, all functional units can be integrated onto the platform, therefore, making the equipment highly integrated, small in size, and strongly resistant to earthquakes. Highly reliable and flexible in structure, better electric compatibility can be achieved. With the breaker, it is possible to rapidly cut off the current in fault when the direct current system meets a fault.

The embodiments of the present invention provide a target detection method and device. The method includes the following steps that: an image to be detected is acquired; a plurality of candidate areasof the image to be detected are classified according to a cascade neural network, at least one level of neural network of neural networks starting from the second-level neural network includes a plurality of parallel sub neural networks of the corresponding level, wherein the sub-neural networks classify classification results of a previous level of neural network; and a target area is determinedaccording to the final classification results of the plurality of candidate areas. According to the method and device provided by the embodiments of the present invention, at least one level of neural network of the neural networks starting from the second-level neural network includes the plurality of parallel sub neural networks at the corresponding level, so that the candidate areas can be classified more comprehensively and accurately, and therefore, classification accuracy can be improved, and the target area can be accurately determined; and the reduction of the neural networks can be benefitted, and storage space occupied by a classification model composed of various levels of neural networks can be decreased. The method and device can be applied to devices with low hardware configurations or low computing performance.

The embodiment of the invention provides an organic light emitting display panel. The organic light emitting display panel comprises a display area and a non-display area surrounding the display area;the display area is provided with pixel rows which extend in a first direction and are distributed in a second direction; the non-display area is provided with scanning driving circuits and light emitting control circuits; each scanning driving circuit comprises cascaded scanning driving circuit units; each light emitting control circuit comprises cascaded light emitting control circuit units; the first-stage scanning driving circuit units drive two pixel rows; the first-stage light emitting control circuit units drive n pixel rows, and n is an even number greater than or equal to 4. By meansof the organic light emitting display panel, the first-stage scanning driving circuit units and the light emitting control circuit units drive multiple rows, the number of stages of the scanning driving circuit units and the light emitting control circuit units is reduced, a bezel occupied by the driving circuits is reduced, and the narrow bezel can be achieved.

A test platform of multifunction refrigeration air-conditioning is an integrated test platform including refrigeration unit and air processing unit as well as control cabinet. The said control cabinet is formed by refrigeration unit, air switch, AC contactor, control intermediate relay, control regulator of high accuracy type, actuator, measurement instrument, data collector, low voltage circuit of dynamic analog display, data collection and control computer.

The invention discloses a multilayer hexagonal substrate integrated waveguide filter which is high in selectivity, low in loss and small in size. The filter comprises a first metal layer, a first dielectric substrate, a second metal layer, a second dielectric substrate and a third metal layer. The first dielectric substrate is provided with a first resonant cavity and a fourth resonant cavity, the second dielectric substrate is provided with a second resonant cavity and a third resonant cavity, and a '2'-shaped mixed coupling slot is formed in the second dielectric substrate and located between the second resonant cavity and the third resonant cavity. The filter can be added with extra transmission zeros, so that out-of-band selectivity of the filter can be improved without increasing excessive filter levels, and the positions of the transmission zeros can be flexibly controlled by means of adjusting size of electric coupling and magnetic coupling coefficients; moreover, the filter is small in size, low in loss, and suitable for popularization and application in the technical fields of microwaves and millimeter waves.

The invention relates to a method for separating zirconium and hafnium, which specifically comprises the following steps of: using the acidic water solution of a zirconium compound as a raw material, extracting hafnium in the material liquid into an organic phase by using diisobutyl ketone (DIBK) or the synergism of DIBK with a neutral phosphorous extracting agent or the synergism of DIBK with anacidic phosphorus-containing extracting agent, and washing and stripping the oganic phase to produce a hafnium-rich liquid such that the separation of zirconium and hafnium is realized; respectively precipitating the hafnium-rich liquid and the remaining organic phase by using ammonia water, and washing and roasting the precipitates to obtain atomic energy level zirconium oxide and hafnium oxide.In the technical method provided by the invention, low content of hafnium in zirconium hafnium is preferably extracted, and the method has simple process and high extraction efficiency. The extraction system used in the method reaches the same zirconium and hafnium separation performance to MIBK (Methyl Isobutyl Ketone) but has smaller water solubility, high boiling point and flashing point and smaller toxicity compared with MIBK, and the problems of great solvent loss, easy outbreak of fire, environmental pollution and the like in the MIBK extraction separation method are solved.

The invention discloses a first-stage circuit structure of a pipelined analog-to-digital converter, which comprises a 4-digit fully parallel analog-to-digital converter, a code circuit and a residue gain analog-to-digital converter. A two-phase non-overlapping clock is adopted, a sampling phase samples input voltage, and a maintaining phase amplifies residual voltage. The residue gain analog-to-digital converter consists of a sub analog-to-digital converter, a subtracter and a residue amplifier. During sampling, the 4-digit fully parallel analog-to-digital converter conducts comparison and quantification on the input voltage and generates a 16-digit thermometer code which is converted to a 4-digit binary output code by the encoder. A lower pole plate of a sampling capacitor array is connected with the input voltage, and an upper pole plate thereof is connected with a common mode level for sampling an input. During maintaining, the sub analog-to-digital converter outputs different voltages to the sampling capacitor array according to a control of the thermometer code; subtraction from the input voltage is accomplished according to twice charge conservation; and a feedback capacitor is in bridge connection with the two ends of the residue amplifier to amplify the residual voltage by 8 times for use by a backward-stage circuit.

The invention provides a jet engine, which is mainly characterized by consisting of an air inlet (1), a gas compressor (2), a combustion chamber (3), a tail nozzle (5) and an independent power plant (7), wherein a power output shaft (8) of the independent power plant (7) is connected with the compressor (2) and drives the gas compressor (2) to rotate to work. By adopting the independent power plant capable of independently changing the output power to replace a turbine in the prior art, the jet engine effectively reduces the pressure ratio of the gas compressor under the condition of same thrust, and avoids the problem of poor aerodynamic stability caused by the matched work of the gas compressor and the turbine; and the engine can better work under different loads, thereby simplifying a structure of the engine, avoiding the surge phenomenon of the gas compressor, and increasing the work scope and the reliability.

The invention discloses a filtration core assembly and a water purification system. The filtration core assembly comprises a housing, a first filtration core and a second filtration core, wherein thehousing is a column capable of extending up and down, the surface of the housing is provided with a first water passing port, a second water passing port, a third water passing port and a fourth waterpassing port, a first flow channel and a second flow channel are arranged in the housing and are independent of each other, the first filtration core is arranged in the first flow channel, a first water passing flow channel is formed between the first water passing port and the first filtration core, a second water passing flow channel is formed between the second water passing port and the firstfiltration core, the second filtration core is arranged in the second flow channel, a third water passing flow channel is formed between the third water passing port and the second filtration core, afourth water passing flow channel is formed between the fourth water passing port and the second filtration core, the first water passing flow channel, the second water passing flow channel, the third water passing flow channel and the fourth water passing flow channel respectively extend up and down, and the first water passing flow channel and the second water passing flow channel are arrangedbetween the third water passing flow channel and the fourth water passing flow channel. With the technical scheme of the present invention, the water path structure is simplified.

The invention provides an analog to digital converter, which solves the problem of low speed and high power consumption of the conventional analog to digital converter with a production line type structure. The analog to digital converter comprises N levels of production line type structures which are connected with one another sequentially, wherein the first level and the second level adopt two-step flash structures, and the levels from 3 to N adopt the production line type structures; N is a positive integer more than 2; and an output of each level is output by a digital correction circuit and used as an output of the analog to digital converter. In the production line type structures, a subthreshold operational amplifier is adopted, so branch current and power supply voltage of a circuit can be reduced; therefore, the power consumption of the circuit is reduced and a design aim of ultralow power consumption can be fulfilled; meanwhile, the two-step flash structures are adopted, the high speed characteristic of the production line type analog to digital converter is retained under the condition of ultralow power consumption.

The invention discloses a method for searching data, which comprises the steps: searching whether a sub-node is matched with a search data string or not according to a second entry of a node matched with the search data string; continuously searching by taking the sub-node as the next node matched with the search data string when the sub-node is matched with the search data; and searching a corresponding first entry according to the second entry when the sub-node is not matched with the search data string so as to obtain a longest match prefix of the search data string. A device for searching the data uses one or more data structures with the lengths of L to express each node according to different numbers of terms in each node. By adopting the flexible expression way, the invention improves the utilization rate of a memory and further improves the network capacity.

The invention discloses a method for extracting and separating 24-dehydrocholesterol and cholesterol by ionic liquid. According to the invention, ionic liquid or binary mixed solvent made of ionic liquid and polar solvent is used as extractant; extract and raffinate are obtained through fractional extraction; and high-purity 24-dehydrocholesterol and cholesterol can be obtained from the extract and the raffinate respectively. The ionic liquid extractant adopted by the method has better thermal stability, noninflammability and higher selectivity than traditional organic solvent, and has the characteristics of simple and safe technology, environmental friendliness and the like, so that the ionic liquid extractant is suitable for industrial production.

The invention discloses a single redundant bit digital correction method used for an assembly line A / D converter, which comprises the steps of: 1) distributing the resolution of each stage of sub circuit; 2) quantizing each stage of sub circuit and inputting voltage to each stage of sub circuit, calculating residual voltage, amplifying the residual voltage and translating the residual voltage to the middle part of a reference voltage interval; 3) determining codes and offset codes of each stage; 4) calculating the total offset codes; and 5) reconstructing the codes and correcting the error caused by comparator imbalance so as to obtain the output codes after correction. Compared with the existing conventional assembly line A / D converter digital correction method, the method has the following advantages of: flexibly distributing the resolution of each stage of sub circuit and obviously reducing assembly line stage number of a high speed and high precision A / D converter, thereby greatly saving the territory area, power consumption and shortening input-output delay. The method firstly provides a coding method of a plurality of positive redundant codes and a plurality of negative redundant codes, after the assembly line A / D converter is corrected by the method, an overflow bit thereof can mark the negative overflow and positive overflow of input signals, namely, bidirectional overflow. The method is applicable to the assembly line A / D converter, in particular to the field of digital correction of the high speed and high precision A / D converter.

The invention discloses an aero-engine aerodynamic stability active composite control method based on stability estimation and prediction. The active composite control method comprises (1) a gas compressor pneumatic instability mechanism and an active control method, (2) an aero-engine stability margin estimation and active stability control method, (3) an aero-engine instability prediction and active anti-surge control method, and (4) an aero-engine active stability composite control method. Aiming at the aero-engine aerodynamic stability problem, the aero-engine aerodynamic stability is improved from three different aspects of gas compressor part stability extension, residue stability margin utilization and active anti-surge, an adjustment and control strategy and algorithm with the surge margin dynamically adjusted and controlled along with the application requirements and suitable for the aero-engine active stability control feature and engineering application background is obtained, and the actual use requirements are met.

The present invention discloses a touch display panel and a driving method thereof, and a touch display device. The touch display panel comprises a driving scanning circuit and m touch driving electrode units; the ith touch driving electrode unit includes ni touch driving electrodes, and the ni touch driving electrodes are divided into at least two touch driving electrode sets; the driving scanning circuit includes m driving circuit units and a shifting register with n cascaded shifting register unit; the kth touch driving electrode in each touch driving electrode unit is connected with the k-grade shifting register unit through the driving control unit, wherein the m and the ni are the integers of larger than 1, 1<=i<=m, the n is the maximum value in the ni, and the k is the positive integer of not larger than ni. According to the scheme, the touch display panels are divided into a plurality of touch driving electrode units, and each touch driving electrode unit uses the same shifting register so as to reduce the series of the shifting register unit and facilitate the realization of the narrow bezel.

The invention discloses a DFIG direct current grid-connected power generation system based on an RMC. The DFIG direct current grid-connected power generation system comprises a plurality of DFIGs and a high-voltage direct current power grid; each DFIG is connected with a stator RMC converter and a rotor RMC converter; each stator RMC converter and the corresponding rotor RMC converter share one controller. Compared with a traditional DFIG grid-connected system, the DFIG system enables an industrial frequency transformer to be smaller in size and lighter in weight. According to the DFIG system, the number of levels of the converters is reduced, a voltage stabilizing capacitor with the large size is replaced by a filter capacitor with the small size and the light weight, and the system is simple in structure and stable in operation performance. The invention further discloses a torque control method of the system, through the synergistic effect of the stator RMC converters and the rotor RMC converters, the constant electromagnetic torque output by the DFIGs and the constant amplitude of air gap flux linkage are guaranteed, and the output active power and the input reactive power of the stator side and the rotor side of a motor are controlled to be equal.

The invention discloses a portable modularized walking aid exoskeleton, and relates to a lower limb exoskeleton which aims at solving the problems that an existing lower limb exoskeleton used for assisting handicapped and elderly people is large in size and weight, poor in comfort degree and not capable of being worn independently. The portable modularized walking aid exoskeleton comprises a lumbar spinal cord module, two thigh modules and two shank modules, the thigh modules are arranged under the lumbar spinal cord module in the mode of mutually serving as mirror images, the shank modules are arranged under the thigh modules in the mode of mutually serving as the mirror images, and thigh binding bands and shank binding bands are both located on the inner sides; an upper output part is connected with an upper plugging lock catch, and a lower output part is connected with a lower plugging lock catch. The portable modularized walking aid exoskeleton is used for handicapped and elderly people assistance, medical rehabilitation and the like.

The invention discloses a contra-rotating outer framework water-air dual-purpose engine. The engine mainly structurally comprises a supporting frame, an oil electric pipeline, a front thrust bearing, a peripheral bearing, a radome, an inner duct, an outer duct, a gas compressor, a ring-shaped combustion chamber, a worm wheel, a rear thrust bearing, a convergent tail spray tube, a central duct, an inner rotor, an outer rotor, a blade tongue-and-groove, a fan, an engine cover, a power transmission circuit, a conductive slide ring, an oil conveying pipeline, a convergent channel, a rotary joint, a metal fuel cavity, a metal-water reaction combustion chamber and a fan stator blade. The gas compressor and the worm wheel of the engine are not provided with a stator blade, and an outer frame rotor and an inner rotor are in counter rotating in an air working state, so that the gas compressor and the worm wheel can realize counter rotating, the absolute rotation speed of the rotor is lowered when the engine efficiency is improved, the axial dimension of the engine is shortened and the structure weight is reduced. When the engine works in water, the ring-shaped combustion chamber does not work, the inner and outer rotors are static, and power is produced by the metal-water reaction combustion chamber, so that water-spraying propulsion is realized.

The invention discloses a Goa (Gate Driver on Array) circuit, a Goa (Gate Driver on Array) circuit scanning method, a display panel and a display device. The objective of the invention is to solve the problem of obvious attenuation of output signals caused by excessive cascade connection of Goa units in a traditional Goa circuit. According to the Goa circuit, the signal output end of a Goa unit at the n-th row is connected with the signal input end of a Goa unit at the n+k-th row; the output end of the Goa unit at the n+k-th row is connected with the reset signal end of the Goa unit at the n-th row and the signal input end of a Goa unit at the n+2k-th row; the Goa circuit also comprises a gating unit; the gating unit is connected with Goa units from the first row to the k-th row; the gating unit controls the Goa circuit to output scanning signals sequentially from the first group of gate lines to the k-th group of gate lines; and in the x-th group, the GOA circuit outputs scanning signals sequentially from the x-th row to the m*k+x-th row. The Goa circuit, the Goa circuit scanning method, the display panel and the display device of the invention are mainly applied to the display field.

The invention provides a servo motor direct-drive type servo valve which has fewer stages, high system stability, good reliability, strong anti-fouling performance, low maintenance cost, a wider application occasion, and lower manufacturing difficulty and cost. The servo motor direct-drive type servo valve comprises a main valve element, a valve body, a spring, a valve body end cover, a lead screw nut, a ball screw and a servo motor, wherein the main valve element is mounted in the valve body in a sliding mode; four oil ports are arranged in the valve body; on-state among the four oil ports is regulated by virtue of changes of left, middle and right positions of the main valve element; the left end of the main valve element is resisted against the valve body end cover through the spring; the right end of the main valve element is connected with the lead screw nut; the lead screw nut is mounted on the ball screw; the servo motor comprises a servo motor shaft, a servo motor rotor, a servo motor stator and a rotary coder; the left end of the servo motor shaft is connected with the balls crew; the servo motor rotor is connected with the servo motor shaft; the servo motor stator is arranged outside the servo motor rotor in a sleeving mode; and the rotary coder is mounted at the right end of the servo motor shaft.

The invention belongs to the field of power electronics and aims at providing a high voltage isolating switch power and a plurality of output isolated switch power systems. The switch power is inputted by AC power sources, inputted into a filter capacitor in parallel after being isolated and rectified by a transformer to change the impedance property, and then outputted by a conventional high frequency switch convertor; and the regulation direction of the switch power is opposite to the conventional direction. Output is divided into a voltage mode and a current mode; and an energy storage value of an output filter capacitor or inductance is higher than that of an input filter capacitor. The circuit and control method adopted by the voltage isolating switch power and the plurality of outputisolated switch power systems have the characteristics of compact structure, simple circuit, high working efficiency and low mutual interference among a plurality of auxiliary power sources, which are especially applicable to distributed auxiliary power supply needing high voltage and superhigh voltage insulated isolation, and can be applied in high voltage power electronic equipment. The high voltage isolating switch power and the plurality of output isolated switch power systems can also directly obtain electric energy from transmission lines of a power system, and assist to supply power for the power electronic equipment in an intelligent grid system.

The invention relates to a robot driving joint, in particular to a serial flexible driving joint having a steel wire transmission function. A reversing bevel pinion is in key connection with an output shaft of a planetary reducer, a reversing big bevel gear is meshed with the reversing bevel pinion and is in key connection with a small rope wheel, one end of a transmission steel wire rope winds around the small rope wheel, the other end of the transmission steel wire rope winds around a big rope wheel, then winds around the small rope wheel and is fixed on the small rope wheel, the big rope wheel is in key connection with a big rope wheel shaft, a rope pre-tightening device is located above a plane, the rope pre-tightening device and one end of a plane of the big rope wheel are arranged in an inverted U-shaped groove of an inverted U-shaped shifting fork, a joint driving assembly is arranged on one end surface of one side of a supporting bottom plate, an external supporting casing is buckled on the supporting bottom plate, an output rod is exposed out of the supporting bottom plate and the external supporting casing, two small rope wheel supporting bearings and two big rope wheel shaft supporting bearings are supported on the corresponding supporting bottom plate and the corresponding external supporting casing respectively. The flexible driving joint is applied to a joint part of a robot.

The invention discloses a turning gear of a steam turbine, comprising a driving motor, a reducer, a swinging gear, a large tooth ring and a clutch mechanism of the swinging gear which are connected in sequence; the large tooth ring is arranged on a rotor of the steam turbine and the reducer is provided with a multilevel speed-reducing transmission pair; the first-level speed-reducing transmission pair of the reducer is a planetary gear transmission box, a second-level speed-reducing transmission pair is an umbrella gear transmission pair and the rest is a planar gear speed-reducing transmission pair; a buffering spring is arranged between an inner tooth ring of the planetary gear transmission box and the box; the bearings of the swinging gear and the planar gear are rolling bearings; the swinging gear is positioned below the middle section of the rotor of the steam turbine and is corresponding to the large tooth ring in a tangential mode. The invention has the advantages of compact structure and small occupied area and has the buffering function with safety and reliability and without miscarriage when in use.

The invention relates to a microwave solid-state power amplifier. The power amplifier works at the environmental temperature ranging from -45 DEG C to +65 DEG C and is used for amplifying a beacon signal and a remote signal between the star and the ground in the communication task, and the solid-state power amplifier adopts multi-stage amplifier cascading, the power amplifier comprises a preamplifier, a driving power amplifier and a final power amplifier connected in series orderly; a microwave signal input end is connected with an input end of the preamplifier, an radio frequency input and output end of each amplifier circuit is connected with a micro-strip isolator; two X-waveband cavity band-pass filters are respectively connected between the microwave signal input end and the preamplifier input end and between an output end of the preamplifier and an input end of the driving power amplifier. The preamplifier also comprises a small signal amplifier and a high-gain microwave integrated power amplifier which are connected in series orderly.

The invention discloses a synchronous after flow ventilating compressor, which comprises a shell, an air inlet of the shell, an outlet of the shell, an impeller, impeller blades, an airflow channel inside the impeller, a blisk of the impeller. The compressor is characterized in that the axial back sides of the impeller blades gradually axially tilt along the radial direction of the impeller from front to back towards the axial direction of the impeller; the axial back side of the impeller gradually axially tilts along the radial direction of the impeller from front to back towards the axial direction of the impeller; and gradually and axially tilting part of the axial direction back side of the impeller is provided with an axial air outlet of the impeller. Compared with the prior art, the compressor has the advantages of simple structure, small volume, few materials, light weight, convenient transportation and mounting, resources, saving good pressurized effect, high efficiency, energy saving, low noise, favorability for environment protection and the like.

The invention discloses a welding pad structure for a ball grid array packaging chip and a multilayer printed circuit board for a mobile phone. The welding pad structure for the ball grid array packaging chip comprises a plurality of welding spots which are mutually spaced and are used for forming a square circular grid array on the surface of the multilayer printed circuit board, wherein the square circular grid array is used for welding the ball grid array packaging chip; non-circular welding spots are arranged among the welding spots on an uttermost circle of the grid array; the length directions of the non-circular welding spots face to circular welding spots on an inner circle of the grid array; and a wire is arranged between two partially adjacent non-circular welding spots. The non-circular welding spots are arranged among the welding spots on the outer circle of a BGA (ball grid array) welding pad and a distance between adjacent welding spots on the outer circle is increased, thereby being capable of wiring from the middle part, connecting the circular welding spots on the inner circle of the grid array, reducing the design difficulty of the multilayer printed circuit board and particularly the design difficulty of a mobile phone main board, reducing the quantity of layer or level of the multilayer printed circuit board, virtually lowering the cost of mass production of the mobile phone main board and promoting the core competitiveness of a circuit board manufacturer.

The invention discloses a charge pump device on the basis of a MEMS (Micro Electro Mechanical System) microphone bias circuit. The charge pump device comprises an oscillator, a reference voltage source, a clock amplitude doubling circuit, a Dickson charge pump, a low pass filter and the like. The oscillator is used for providing a two-phase non-overlapping clock with the duty cycle of 50 percent and regulating the amplitude of a two-phase non-overlapping clock signal into two times of the amplitude of a reference voltage. According to the invention, a reference voltage and clock amplitude defining circuit is added and can be used for implementing the stable high voltage output; and due to the adoption of a clock amplitude doubling technology, the number of stages of a diode-capacitance voltage unit is reduced by at least four stages, the area of a core circuit of the charge pump is at least shortened by 21 percent, the power consumption is at least reduced by 40 percent and the conversion efficiency is improved by nearly once.

The invention discloses an air separation system for recycling waste heat of compressed air. The air separation system comprises an air flow path and a purification module, and further comprises a dehumidification regeneration loop and an absorption type refrigeration circulation loop; the dehumidification regeneration loop comprises a dehumidifier, a first solution heat exchanger, a generator, afirst flow controller and a first solution pump; the absorption type refrigeration circulation loop comprises a high-temperature air channel of the generator, a condenser, an expansion element, a low-temperature evaporator, a cooling channel of the dehumidifier, an absorber, a second solution pump, a second solution heat exchanger, a second flow controller and a throttling element; and the air flow path comprises a dehumidification channel, a primary air compressor, a primary compressed air pre-cooling flow path of the generator, a first cooling unit, a primary channel of the low-temperature evaporator, a secondary air compressor, a secondary compressed air pre-cooling flow path of the generator, a second cooling unit and a secondary channel of the low-temperature evaporator which communicate with the dehumidifier in sequence, and finally, the air flow path communicates with the purification module.