612results about How to "Reduce cost loss" patented technology

A thermal type flow meter has a first heating resistor, a second heating resistor for blocking heat transfer from the first heating resistor to a console, a temperature measuring resistor interposed between the two heating resistors, and a controller for calculating a flow rate unrelated to temperatures of fluid from temperatures of the resistors and currents supplied to the heating resistors.

The invention discloses an intelligent finance and tax service platform based on a SaaS platform. The intelligent finance and tax service platform comprises a basic support layer, a data resource layer, a support layer, an application layer and a presentation layer, wherein the basic support layer comprises a basic library and a service library; the support layer comprises a plurality of modules; the application layer comprises a plurality of modules; the presentation layer is a comprehensive portal unified management platform and comprises a plurality of modules. The intelligent finance and tax service platform has the advantages that the platform can provide comprehensive accounting services such as financial accounting, tax planning, tax declaration, internal audit, finance and tax consulting and headhunting, and industry development balance is promoted; by the intelligent finance and tax service platform, original accounting of enterprises is electronized, the enterprises can clearly learn about accounting progress and real-time data in an accounting work cycle, accounting efficiency is increased, and the original 8-hour accounting is changed into 24-hour accounting without location limitation.

The invention discloses a method for recovering valuable elements in waste lithium ion battery electrode materials. The method comprises steps of roasting the waste lithium ion battery electrode materials in an inert gas atmosphere, the roasting temperature is 200 -600 DEG C, the time is 30-360 minutes, and the roasting slag is obtained; mixing the obtained roasting slag and an acidic solution with [H+] concentration of 0.5~8 mol / L according to the mass ratio of 1:3~10; leaching at the leaching temperature of 30-90 DEG C and leaching time of 1-8 hours, leach liquor and leach residues are filtered to be obtained; the leach liquor is used for recovering nickel, cobalt, manganese, aluminum and lithium, and the leach residues are used for preparing negative electrode materials. According to the method for recovering valuable elements in waste lithium ion battery electrode materials, a leaching reducing agent does not need to be additionally added, the battery sorting and recycling costs are reduced, the positive and the negative electrode materials can be recovered at the same time, and the economic benefits of lithium battery recovery can be improved.

The invention discloses a modular multilevel converter with a direct-current fault isolation function and a modular multilevel converter (MMC) submodule. The twin-submodule in series consists of a first to a fifth IGBT (insulated gate bipolar transistor) T1 to T5, a first to a sixth diodes D1 to D6, a first capacitor C1 and a second capacitor C2; the twin-submodule in series includes two operation modes: a normal operation mode and a blocked mode, under the blocked mode, all controllable switches, i.e. the first to the fifth IGBT T1 to T5 are completely switched off, and then the capacitance voltage of the submodule is accessed to a current circulating path in a reverse polarity manner. When a direct-current fault occurs, the submodule enters the blocked mode, and the capacitance voltage is accessed in the reverse polarity manner, so that the elimination of fault current and the fault isolation can be realized. A plurality of twin-modules in series are connected in series to form a bridge arm of the modular multilevel current converter, six bridge arms with the same topology form a three phase full bridge structure and from a modular multilevel current converter structure. The fault isolation speed and the fault recrudescence preventing capacity can be greatly improved, and the investment cost and switch loss are greatly reduced.

The invention provides an optimization method of the operation of a power station boiler. The optimization method comprises the following steps: obtaining optimal operating condition data; obtaining current operating condition data of a thermal power generating unit; when safety index parameters, stability index parameters and environment-friendly index parameters all meet pre-set conditions, obtaining a power generation cost of a current operating condition; if finding an operating condition which is the same as the current operating condition from the optimal operating condition data, obtaining an optimal operating condition power generation cost of the current operating condition; if not finding, adding current operating condition parameters into historical operating condition data; if the power generation cost of the current operating condition is less than or equal to the optimal operating condition power generation cost, sending out a first alarming prompt; otherwise, obtaining an adjusting value and obtaining a cost loss; sending out a second alarming prompt and outputting the adjusting value; continuously adjusting an oxygen amount and an air feeding amount according to the adjusting value; and when meeting a pre-set condition, stopping adjusting. The invention further provides an optimization device of the operation of the power station boiler and the stability of optimizing the power station boiler is improved.

The invention discloses a network intrusion detection method and device based on ensemble learning, and the method comprises the steps: collecting network intrusion detection data, extracting features, carrying out the preprocessing, building a training data set, selecting attack type data with a smaller data size, and increasing the data size of the attack type data; training a plurality of learners for each data type in the training data set, and then fusing the learners together in an ensemble learning mode to form an ensemble learning model corresponding to each data type; setting an optimal classification threshold for each data type to minimize the cost of misclassification; and respectively inputting to-be-detected data into the ensemble learning model of each data type, and obtaining the data type to which the to-be-detected data belongs according to the output result of the ensemble learning model and the classification threshold. According to the method and the device, the problems of low detection accuracy, high false alarm rate and high false alarm rate of attack data of attack types with small data volume in the prior art can be effectively solved.

The invention discloses a manufacturing and assembling product quality prediction method based on a parallel long-short-term memory network. The method comprises the following steps: obtaining characteristics of each station step of the product; pre-processing the characteristics of each station step of the product; establishing a product quality prediction model based on a parallel long short-term memory network; performing parameter optimization training of a product quality prediction model based on a parallel long-short-term memory network; and predicting the quality characteristics of theto-be-tested sample based on the quality prediction model. The method is used for solving the problem of product quality prediction possibly existing in parallel working steps in the manufacturing and assembling process, can automatically obtain the influence between cross-working-step technological process parameters between the parallel working steps, and has higher product quality prediction precision, flexibility, prediction efficiency and model reusability.

A multivariate product quality monitoring method oriented to a digital workshop includes the steps: building a quality information acquisition scheme suitable for the digital workshop; building a quality control and improvement model oriented to the digital workshop, and particularly performing multivariate process capacity analysis based on an improved principal component analysis method according to multiple quality characteristics of key processes of key products of a machining workshop; controlling and diagnosing multivariate product by the aid of principal component analysis technology to solve the problem that a multivariate statistical control chart difficultly diagnoses and positions process exception. The quality assurance capability of the key processes of the key products can be quantitatively evaluated by the workshop, and a source of a quality problem is timely positioned when the quality problem arises, so that further cost loss is avoided.

The invention discloses a road scene segmentation method based on a residual network and expanded convolution. The method comprises: a convolutional neural network being constructed in a training stage, and a hidden layer of the convolutional neural network being composed of ten Respondial blocks which are arranged in sequence; inputting each original road scene image in the training set into a convolutional neural network for training to obtain 12 semantic segmentation prediction images corresponding to each original road scene image; calculating a loss function value between a set formed by12 semantic segmentation prediction images corresponding to each original road scene image and a set formed by 12 independent thermal coding images processed by a corresponding real semantic segmentation image to obtain an optimal weight vector of the convolutional neural network classification training model. In the test stage, prediction is carried out by utilizing the optimal weight vector of the convolutional neural network classification training model, and a predicted semantic segmentation image corresponding to the road scene image to be subjected to semantic segmentation is obtained. The method has the advantages of low calculation complexity, high segmentation efficiency, high segmentation precision and good robustness.

The invention discloses an automobile door-plate wire-harness protective-sleeve rubber composition and a processing technology thereof. The composition is prepared from the following raw materials in parts by weight: 40-60 parts by weight of natural rubber, 10-30 parts by weight of cis-1,4-polybutadiene rubber, 20-30 parts by weight of ethylene-propylene rubber, 4-9 parts by weight of an activator, 0.5-2.5 parts by weight of stearic acid, 4-6 parts by weight of an anti-ageing agent, 1.5-3.5 parts by weight of a coupling agent, 25-45 parts by weight of a reinforcing agent, 5-15 parts by weight of a plasticizer, 1.5-3 parts by weight of a vulcanizing agent, and 0.5-2.0 parts by weight of a promoter. The processing technology successively comprises steps of first-segment rubber mixing, first standing, second-segment vulcanizing, second standing and the like. The composition possesses excellent heat resistance, ageing resistance, ozone resistance, high strength and high elasticity, does not pollute vehicle body, guarantees a protective sleeve to not fail, not rupture and be not frequently replaced because of damage after long-term repeated tension, and helps to reduce cost loss.

The invention discloses an SOC detection device and method for an all-vanadium redox flow battery. The SOC detection device comprises an electrolyte sampling device, a spectrophotometer and a processing unit. The electrolyte sampling device respectively samples positive and negative electrode electrolytes of an all-vanadium redox flow battery and performs dilution. The spectrophotometer performs wavelength scanning and respectively measures the absorbance of first wavelength light of the positive electrode electrolyte and the absorbance of second wavelength light of the negative electrode electrolyte. The processing unit calculates an SOC value on the positive electrode side according to the absorbance of the first wavelength light of the positive electrode electrolyte and also calculates an SOC value on the negative electrode side according to the absorbance of the second wavelength light of the negative electrode electrolyte. According to the invention, the interference of a temperature factor to the SOC detection is well avoided, the SOC detection accuracy of the all-vanadium redox flow battery is thus improved, the cost loss caused by a detection error is prevented, and various costs are saved.

The invention relates to a fiber array board assembly device and a fiber array board assembly platform using the same. The fiber array board assembly device comprises an L-shaped positioning base and a clamp component. The L-shaped positioning base comprises a side wall and a base. A positioning block is fixedly connected to the inner side of the side wall. A pressure block parallel to the positioning block is also movably connected to the inner side of the side wall. The pressure block can horizontally move along the inner side of the side wall. The inner side of the side wall is further provided with a clamp groove. The base is provided with a through hole. A lifting member and a support member are disposed in the through hole. A U-shaped support is disposed on two side walls of the clamp component. An elastic member is arranged between the bottom of the U-shaped support and the bottom of the clamp component. A glass pressure block is arranged between two ends of the U-shaped support. One end of the clamp component is provided with a protrusion which is clamped in the clamp groove. The lifting member controls the U-shaped support to ascend and descend through the support member.

The invention relates to a three-port full-bridge inverter and a method for controlling the same. The three-port full-bridge inverter comprises an input source, four switch tubes, a storage battery, an inductor, an output filter inductor, an output filter capacitor and an alternating current load, wherein a source of the first switch tube is connected in series with a drain of the second switch tube to form a first switch bridge arm; the source of the third switch tube is connected in series with the drain of the fourth switch tube to form a second switch bridge arm; an anode of the input source is respectively connected with the drain of the third switch tube and the drain of the first switch tube, and a cathode of the input source is respectively connected with the cathode of the storage battery, the source of the fourth switch tube and the source of the second switch tube; the anode of the storage battery is sequentially connected with a middle point of the second switch bridge arm and one end of the output filter inductor through the inductor; the middle point of the first switch bridge arm is respectively connected with one end of the output filter capacitor and one end of the alternating current load; and the other end of the output filter capacitor and the other end of the alternating current load are respectively connected with the other end of the output filter inductor. The invention is high in conversion efficiency, low in cost and low in power loss, and can be widely applied to the technical field of new energy generation.

The invention relates to an intelligent sampling method and application of the method in cigarette quality control. The method is used for diagnosing quality data tested by a test board, the existing quality risk is judged according to a data result, and meanwhile, the sampling frequency is adjusted, so that the efficiency of quality prevention and control is improved, and the quality detection cost and quality loss are reduced. For example, if the quality of a product is judged to reach the standard, the sampling frequency is lowered, and if the quality of the product does not reach the standard, the sampling frequency is improved.

The invention provides a high-speed interconnecting method of controllers of a tight-coupling multi-control storage system. According to the high-speed interconnecting method of the controllers in a tight-coupling multi-control storage system, resource scheduling and coordination of the controllers in the multi-control storage system through a system program, so that data transmission among different controllers is achieved. A storage controller CPU packages decision information and sends the packaged decision information to a high-speed bus extended by a north bridge. A data exchanger analyzes objective information in data, adjusts connection status of the bus which is compared with a local FW corresponding table and achieves data directed transmission among multiple controls. With regard to a clustered storage system formed by the controllers which are coupled, some manufactures adopt storage node stacking, while some manufactures only adopt control unit stacking, and no matter what kind of modes are applied, the modes have the common advantages that production cost is reduced and the manufacturers are made to form a large-scale storage system through a standardized module combination, so that the requirement of a large-scale application system for the storage capacity and performance can be met. Through the standardization, cost allowance of a production process can be reduced, and the research and development cycle of the system can be shortened.

The embodiment of the invention provides an IP address correction method and an IP address correction device. The method comprises the steps that after a client sends an access request to a web server, the web server sends a first IP address of the access request to an advertisement server; a content delivery network server receives a dotting request which is initiated by the client and corresponds to the access request and carries out identity authentication on the dotting request through an identity authentication server; if the content delivery network server receives an authentication success result returned by the identity authentication server, a dotting IP address corresponding to the access request is extracted from the dotting request and is sent to the advertisement server; and the advertisement server carries out matching calculation on the dotting IP address and the first IP address corresponding to the same client and corrects a true IP address of the access request. The obtained IP address can be corrected, the corrected IP address relatively fits a region in which the client initiating the access request is located, a wrong charging probability is reduced, and cost losses of an advertisement releaser are reduced.

The invention discloses a model prediction control based leakage current suppression method of a cascaded H-bridge photovoltaic inverter. The method comprises the following steps of writing 256 switching states of four H-bridge cascaded inverters, and calculating a value of voltage sum Vc of a corresponding photovoltaic battery parasitic capacitor; selecting the switching states to form switching state combinations; calculating an output voltage Vk of an AC side of the inverter; detecting a voltage Vg(k) of a power grid and a power grid current i(k) at a moment k on line, and calculating a value i(k+1) of the power grid current at a moment (k+1); performing phase locking of the power grid voltage Vg(k) obtained through on-line detection to obtain a phase Theta, calculating a current given value i<*>(k+1) at the moment (k+1) according to the Theta, and substituting a current calculation value i(k+1) at the moment (k+1) and the current given value i<*>(k+1) to an estimation function h; and selecting and using the switching state combination corresponding to the minimum estimation function h as output quantity, and driving a switch tube by a driving circuit. By the method, the leakage current of a system can be effectively suppressed, extension is facilitated, and the method is suitably used for a single-phase non-isolated cascaded H-bridge photovoltaic grid-connected inverter with a plurality of H bridges.

The invention discloses a cleaning tool. The cleaning tool comprises a mop bucket and a mop. The mop comprises a mop rod, a bottom board and a rotation joint. The mop rod comprises an outer rod body and an inner rod body. The rotation joint comprises a first rotation part and a second rotation part. The bottom of the mop bucket is provided with a lifting mechanism. The lifting mechanism comprisesa fixing column fixed at the bottom of the mop bucket, a moving tube and a positioning rod. The moving tube is sheathed outside the fixing column. The positioning rod passes through the moving tube and is inserted in an inserting hole at the center of the fixing column, and the positioning rod is rotated relative to the fixing column. The lifting structure of the cleaning tool is simplified, and the operation is convenient, so the washing and dewatering functions of the mop are combined and coaxially performed, and the volume of the mop bucket can be reduced. The locking structure of the mop rod is simplified, and the angle between the mop rod and a faceplate can be conveniently adjusted and positioned. The locking structure is suitable for the mop or other cleaning tools with the similardemand. In addition, wiping cloth is effectively fixed on a bottom plate of the mop through a fixing claw by the lower faceplate, so the service life of the mop is prolonged.

The invention relates to an automatic production line optimization method based on cache region capacity calculation, belongs to the technical field of automatic production line optimization design, and solves the problems of production line logistics blockage, low production efficiency, complex cache region capacity formula and low precision caused by incapability of eliminating equipment failure rate in the prior art. The method comprises the following steps: determining production parameters and key section bottleneck procedures of an automatic production line; establishing an automatic production line simulation model according to the process flow of the initial production line and the factory layout, loading production parameters of each procedure, and then running to obtain a production efficiency evaluation index; changing the numerical values of the production parameters of each procedure, re-operating the model, and determining factors influencing the production efficiency of the production line and optimization numerical values according to a simulation result; arranging cache regions on the two sides of the bottleneck procedure of the key section respectively, operating the model again, and obtaining the cache region capacity which does not affect the production efficiency of the production line; and updating the initial production line as an optimized production line.

The invention discloses a calibration method of a surface densitometer. The calibration method of the surface densitometer comprises the following steps of (1) preparing a standard pole piece having acoating with a known surface density value formed on the surface, wherein the standard pole piece has a diameter larger than that of the spot formed by the radiation emitted by the radiation source of the surface densitometer to be calibrated; (2) placing the standard pole piece under the radiation source so that the standard pole piece completely covers the spot; (3) measuring the surface density of the standard pole piece by using the surface densitometer to be calibrated to obtain a surface density machine measured value of the standard pole piece; and (4) calibrating the surface densitometer to be calibrated according to the surface density machine measured value and the known surface density value. The calibration method can easily and efficiently calibrate the surface densitometer,and has the advantages of high accuracy and low cost loss.

The invention discloses a vector multiplication cross engine which comprises a combustion chamber enveloping space and a high-pressure working medium storage tank, wherein a combustion chamber passage is arranged on the outer wall of the combustion chamber enveloping space, and the combustion chamber enveloping space is communicated with the high-pressure working medium storage tank through the combustion chamber passage. The invention solves the problem that when the piston of the existing piston type internal combustion engine is positioned near the upper dead point of the power stroke, the pressure in the cylinder is maximum, but the torque is very small and even zero and can not effectively output mechanical work to the outside; the invention reduces the instant gas pressure, temperature and NOx production quantity of combustion explosion, weakens the impact of high pressure of gas to components such as the piston, a connecting rod, a crankshaft and the like, can reduce the weight of the engine, the manufacturing cost and friction loss, and improves the torque of the motor; and moreover, the invention also discloses a scheme of one combustion explosion for many times of work, and further greatly improves the efficiency and environment protection of the engine.

The invention discloses a unidirectional direct current-direct current autotransformer for transmitting a direct-current power between two direct-current systems in a unidirectional mode. On the basis of optimized designs of a converter, a rectifier, and an alternating-current link, defects of large converter capacity, large alternating-current link capacity, and high running losses according to the existing unidirectional direct current-alternating current-direct current conversion technology can be overcome. A voltage source type converter is used for controlling an alternating-current voltage of the unidirectional direct current-direct current autotransformer, thereby realizing controlling of a direct-current power transmitted between a low-voltage first direct-current system and a high-voltage second direct-current system or a direct-current power transmitted between a high-voltage second direct-current system and a low-voltage first direct-current system and thus realizing power transmission between the two direct-current systems. Moreover, the unidirectional direct current-direct current autotransformer has the advantage of configuration of the bidirectional direct-current fault isolation capability. In addition, the invention discloses corresponding high-voltage-side and low-voltage-side direct-current fault isolation methods.

The invention discloses a high gain dual-input direct-current converter based on a switched capacitor network and a modulation method; the high gain dual-input direct-current converter comprises two input sources, two inductors, two power switch tubes, one four-switch capacitor network unit, an output diode, an output filter capacitor and a load resistor; the four-switch capacitor network unit comprises four switch capacitors and four diodes, and the switch tubes can be connected / disconnected so as to effectively charge / discharge the capacitors. The dc converter is simple in a topology structure, small in switch device voltage stress, and two input sources can respectively provide the voltage gains 3 times and 2 times bigger than a conventional Boost converter, thus realizing two-input source high boost transformations; the dc converter is simple and flexible in control, and two path duty ratios can be controlled so as to control the two path input currents and output voltages, thus flexibly distributing each input source powers and maximum power tracing of the new energy.

The invention relates to a single-phase electric energy quality controller for an electrified railway power supply system, which is characterized by comprising a load side converter, a no-load side converter, a DC unit, a capacitive impedance and a booster transformer, wherein the load side converter and the no-load side converter exchange energy through the DC unit to form a back-to-back rectifier inverter; and the load side converter is connected with the capacitive impedance, and the no-load side converter is connected with the booster transformer. The controller provided by the invention has functions of active power control, reactive power compensation and harmonic compensation, and is capable of effectively improving electric energy quality in a traction power supply system of the electrified railway and reducing system loss.

The invention relates to a boxing packaging machine, in particular to a boxing packaging machine for machined and formed boards. The boxing packaging machine for the machined and formed boards is provided, wherein the boxing packaging machine automatically packages the boards, and can relatively protect the boards. The boxing packaging machine for the machined and formed boards comprises a bottomplate, a pushing mechanism, a cutting mechanism, an automatic intermittent discharging mechanism, and an intermittent clamping mechanism, wherein the pushing mechanism is arranged in the middle of thebottom plate, the cutting mechanism is arranged on the bottom plate, the automatic intermittent discharging mechanism is arranged in the middle of the bottom plate, and the intermittent clamping mechanism is arranged among the intermittent clamping mechanism, the cutting mechanism and the automatic intermittent discharging mechanism. According to the boxing packaging machine for the machined andformed boards, the pushing mechanism and the cutting mechanism are matched with each other, so that a storage frame is used for discharging the boards, the boards fall into a conveying frame, the boards are pushed through a first pushing plate, and the effects that when people package the boards, the labor is saved, and the working efficiency is relatively improved are achieved.

The invention relates to an all-directional stacking system of an automatic robot, and aims to provide a stacking system with high automation degree and high efficiency. The system comprises an automatic packing machine, belt conveyors and stacking devices; a first double-chain conveyor and a second double-chain conveyor are arranged above a tray reservoir; and a third double-chain conveyor is arranged above the first double-chain conveyor and the second double-chain conveyor. The front ends of the first double-chain conveyor and the second double-chain conveyor are respectively connected with a first belt conveyor and a second belt conveyor; and the second belt conveyor is connected with a third belt conveyor. A fourth belt conveyor is arranged on the first belt conveyor; and a package pusher and a slide way are respectively arranged at the front end and back end edges of the fourth belt conveyor. A first stacking device and a second stacking device are respectively arranged behind the first double-chain conveyor and the second double-chain conveyor; and a first three-chain conveyor and a second three-chain conveyor are respectively arranged behind the first stacking device and the second stacking device.

The invention discloses a processing method and apparatus for putting cell phone in-and-out-of service. The method comprises the following steps: for each user number, regularly checking the fee counting systems of a communication operator rented platform and a virtual operator platform so as to obtain the user number's balance status on the communication operator rented platform and the virtual operator platform; if the user number does not have arrearages on the communication operator rented platform but have arrearages on the virtual operator platform, determining whether the arrearages of the user number on the virtual operator exceed a preset threshold for the arrearages or not; and if the arrearages of the user number on the virtual operator do not exceed the preset threshold for the arrearages, determining that the user number can still be used until the use number has arrearages on the communication operator rented platform, in case of which the out-of-service state on the virtual operator platform is set as already out-of-service state. With the processing method and apparatus, it is possible to avoid the problem that when a virtual operator needs to be dismantled in a out-of-service state with user number still valid, in the settlement between the virtual operator platform and the communication operator rented platform, the monthly payment and the additional payment for conserving the user number valid for three months can be automatically subtracted from the virtual operator platform, therefore, cutting the fee losses for the virtual operator.

The invention discloses a diode pickling machine in the diode manufacturing field, and the diode pickling machine comprises a pickling trough, a base and a pickling tank. The pickling trough is located at the upper end of the base, one side, where the pickling trough locates, of the base is provided with a vertical support, the pickling tank is fixed to one side, close to the pickling trough, of the support, the pickling tank is located above the pickling trough, and the bottom of the pickling trough is provided with a liquid supply pipe. The top of support is provided with a flow collecting cover, the top end of the flow collecting cover is provided with a drawing fan, and an exhaust pipe is connected to the drawing fan. The flow collecting cover locates above the pickling trough, the outer side wall at the lower end of the flow collecting cover is hinged with a rotary shaft, and transparent isolation cloth is fixed to the rotary shaft. Through arrangement of the flow collecting cover, the drawing fan, the isolation cloth and the like, acid mist volatilized in the diode pickling process is isolated and detached, the acid mist diffusing in a processing place is prevented from causing damage on a human body and pollutions on environment, the diode pickling machine is relatively environmental-friendly, and pickling environment of diodes is relatively healthy.

The invention discloses an energy control method of a multi-port alternating-current and direct-current hybrid microgrid system. According to an alternating-current loop in the model, capacitor voltages in the modular multilevel converter, the dual-active full-bridge converter and the sub-modules and output currents on the alternating-current side are controlled through total energy control and alternating-current output current control; according to a direct-current loop in the model, the sum of the capacitor voltages of the upper bridge arm and the lower bridge arm of each phase is controlled through interphase energy control, and a direct-current component of circulation reference is obtained; the difference between the capacitor voltages of the sub-modules between the upper bridge armand the lower bridge arm in the same phase is balanced through inter-arm energy control, and a fundamental frequency alternating current component of circulation reference is obtained; direct currentand fundamental frequency alternating current components in the modular multilevel converter are tracked through a circulation controller, inherent frequency doubling current is suppressed, and capacitance energy in a bridge arm is adjusted; through phase-shifting carrier modulation, modulation signals of the sub-modules are adjusted, and capacitance and voltage balance of the sub-modules is achieved.

The invention provides a rotary main shaft device for a micro electric spark machining machine which is applied to the technical field of micro machine manufacturing of micro machining limitation. The rotary main shaft device for the micro electric spark machining machine comprises a rotary main shaft, precision bearings, an electrifying device, an electric brush, insulating plastic, an upper end cover, a first insulating body, a ceramic material, a second insulating body, an inner insulating pipe, an outer liquid passing pipe sleeve, a motor, a synchronous belt, a main shaft shell, a lower end cover and bolts. The motor is arranged on a stand of the main shaft shell. One end of the synchronous belt is connected with an output shaft of the motor in a sleeved mode, and the other end is connected with a belt pulley of the rotary main shaft in a sleeved mode. The second insulating body is arranged on the upper end cover. The inner insulating pipe is arranged inside the second insulating body. The outer liquid passing pipe sleeve is arranged on the upper portion of the second insulating body and the external of the inner insulating pipe. A micro hole, a groove and a curved face with the diameters lower than 0.1 mm can be machined on quenched steel hard alloy, stainless steel and other super-hard and super-soft conductive materials, a high-frequency supersonic vibration technology is adopted by the rotary main shaft, the production efficiency is improved, the production cost and the electrode loss are lowered, and the machining quality is improved.