94results about How to "Small quality" patented technology

The inventive vibration absorber comprises an execution unit, a control unit and a sensor. The execution unit consists of a magnetic inductor, a coil, a magnetic rheological elastic body, a vibration-absorbing mass block and a base. The above magnetic inductor consists of inner and outer sleeves, or a U-shaped iron-core and an armature or top and bottom plates and a column iron-core. Between inner and outer sleeves, the U-shaped iron-core and the armature or the top and bottom plates are filled the magnetic rheological elastic bodies. By regulating the voltage on the coil, the rigidity and the elasticity of the magnetic rheological elastic body are regulated to make its vibration frequency change, so as to make the vibration frequency of the vibration absorber execution unit is the same as that of the vibration-damping object.

The invention discloses a modularization mechanical arm joint with variable freedom. Modularization design idea is introduced into the design of a light mechanical arm, and through a plurality of mechanical arm joints, modularization mechanical arms with different freedom degrees can be formed by splicing. The modularization mechanical arm joint comprises an output flange shaft formed by an output flange and an output shaft, a harmonic wave speed reducer, a hollow shaft motor, a braking device and a double-coded-disc locating mechanism. The harmonic wave speed reducer and the output flange are fixed. Meanwhile, the harmonic wave speed reducer and a hollow shaft of the hollow shaft motor are fixed. The hollow shaft rotates, and after speed reducing through the harmonic wave speed reducer, the output flange is driven to rotate. The braking device is used for carrying out emergency braking during an emergency situation. The double-coded-disc locating mechanism is used for obtaining the speed information of the hollow shaft and the position information of the output shaft. Control of the parts is achieved through a servo driving circuit. The modularization mechanical arm joint has the advantages that the mechanical arm can have strong environment adaptation capacity, and high function expandability, flexibility and adaptability are achieved.

The invention relates to a damping device, especially active vibration absorber and the control method. Said vibration absorber in vibration absorbing system comprises main drive part, vibration absorbing block, changeably stiffness part, magnetic insulation block and U-shaped bracket. The main drive part comprises permanent magnet and column electromagnet. The column iron core is fixed on the bottom of bracket and permanent magnet is fixed with vibration absorbing block by magnetic insulation block. The changeably stiffness part comprises U-shaped electromagnet and MR elastomer. U-shaped iron core is opened downward, of which MR elastomer are set on two inner sides respectively. Vibration absorbing block is set among two chips and the lower end of U-shaped iron core is fixed with the upper end of U-shaped bracket to form inner space where the main drive part, vibration absorbing block, MR elastomer and magnetic insulation block are accommodated. The control method is that the changeably stiffness part and main drive part are controlled respectively according to frequency, amplitude value and phase information of vibration-damping objects. The invention belongs to half-active and active combined control and is provided with low consuming and wide vibration-damping frequency so on.

A shape-memory epoxy-resin system consists of epoxy-resin and curing agent in proportion of 100:13.55-22.75; epoxy-resin is bisphenol A epoxy resin or bisphenol A epoxy and fatty epoxy blend resin, curing agent is p-p'-diamino-diphenyl-methane. It's light, efficient and non-toxic, and has less folding and packing volume, long storage period. It can be used for ultra-large spatial structure materials.

The invention discloses a variable-freedom-degree modular mechanical arm. According to the variable-freedom-degree modular mechanical arm, the modular design idea is introduced into the design of light mechanical arms, and modular mechanical arms with different freedom degrees can be obtained through splicing by means of multiple modular mechanical arm joints. The variable-freedom-degree modular mechanical arm comprises an output flange shaft, a harmonic reducer, a hollow shaft motor, a brake device and a double-weight disc positioning mechanism, wherein the output flange shaft is composed of an output flange and an output shaft, and the output shaft is sleeved with the harmonic reducer, the hollow shaft motor, the brake device and the double-weight disc positioning mechanism. The harmonic reducer is fixed to the output flange and is also fixed to a hollow shaft of the hollow shaft motor. The hollow shaft drives the output flange to rotate after rotating to be decelerated through the harmonic reducer. The brake device is used for conducting emergency brake when an emergency occurs. The double-weight disc positioning mechanism is used for obtaining the speed information of the hollow shaft and the position information of the output shaft. All the components are controlled through a servo driving circuit. The variable-freedom-degree modular mechanical arm has the advantages of being higher in environmental adaptability and high in functional expandability, flexibility and adaptability.

The invention provides a micro-strip rectification antenna based on a WIFI frequency band. The micro-strip rectification antenna based on the WIFI frequency band comprises a micro-strip receiving antenna and a micro-strip rectification circuit, wherein the micro-strip receiving antenna is a coaxial feed rectangular micro-strip antenna, and the micro-strip receiving antenna and the micro-strip rectification circuit both adopt printing circuits and manufactured on two Teflon double-sided copper-coated substrates respectively and connected through an SMA head. The micro-strip rectification antenna based on the WIFI frequency band is produced in batches through the printing circuit technology, is low in cost, is easy to realize, is based on the 2.45GHZ and 5.8GHz WIFI frequency bands, is wide in application range, is easy to popularize and has the advantages of being high in gain and large in receiving efficiency.

The invention relates to a solar heliostat transmission gear, which comprises an upper box body component, a lower box body component and a rotary mechanism which connects the upper box body component and the lower box body component into a whole, wherein, the rotary mechanism comprises a spline groove which is matched and connected with a lower worm wheel shaft in the lower box body component and is arranged in the center of an upper box body bottom surface of the upper box body component, and the lower worm wheel shaft drives the upper box body component to move through the spline groove. Moreover, a gap fine adjustment structure is respectively arranged on both shaft ends of an upper worm wheel shaft in the upper box body component and the lower worm wheel shaft in the lower box body component and comprises an end bearing, a transparent cover and a threaded sleeve, wherein, the end bearing is arranged on the end part of the upper worm wheel shaft or the lower worm wheel shaft; the transparent cover is fixed together with an upper box body or a lower box body, and an inner ring of the transparent cover is provided with threads; and the threaded sleeve is arranged inside the transparent cover and externally provided with threads which are matched with the threads of the inner ring of the transparent cover, and tightly presses on the end bearing. The solar heliostat transmission gear not only has simple transmission form, high transmission efficiency and good maintainability, but also has long service life and low manufacturing and maintenance costs.

The invention relates to a psychological assessment method and a psychological assessment system. The psychological assessment system comprises a sensor module and a mobile monitor, wherein the sensor module comprises contact sensors and non-contact sensors, so that different kinds of physiological parameters can be obtained; the mobile monitor is connected with the sensor module in a wireless/wired manner to obtain various physiological parameters and is used for classified recognition and integration of the obtained physiological parameters by the aid of a neural network so as to obtain a final assessment result. The psychological assessment method and the psychological assessment system have the advantages that the psychological assessment system is small in size, low in mass, portable and high in mobility, and various physiological data of assessed personnel are obtained in a contact or noncontact manner, so that authenticity of the result is guaranteed; meanwhile, since multiple kinds of human body physiological parameters are collected in real time and the neural network is used for processing the obtained parameters, precise judgment result obtaining can be guaranteed.

The invention pertains to the field of power system microgrid protection and control, and relates to a microgrid non-destructive island detection method based on adaptive reactive disturbance. The method comprises the following steps: periodic reactive disturbance is added on the reference value of IBDG reactive output, the peak value selection of a triangular wave reactive disturbance portion is related to the IBDG operating mode and the system frequency when the reactive disturbance value is zero in the last disturbance period; and if the absolute value of the frequency change rate is detected to be equal to a preset value, and the duration time reaches a time setting value, then the island state is judged. The method of the invention is simple and practicable, and can be used to minimize the total disturbance and the influences of the disturbance on the quality of electric energy.

The invention discloses a laminated type PVDF actuator comprising multilayer PVDF piezoelectric film units. PET films are adhered to the two sides of the multilayer PVDF piezoelectric film units. In the multilayer PVDF piezoelectric film units, directions of polarization of two adjacent layers of PVDF piezoelectric films are opposite, and the two adjacent layers of the PVDF piezoelectric films are mutually adhered via epoxy resin layers. Conductive lead wires are respectively led out of all layers of the PVDF piezoelectric films in the multilayer PVDF piezoelectric film units and between the PVDF piezoelectric films and the PET films. All conductive lead wires are mutually connected in a spacing way so that a first electrode and a second electrode are formed respectively. Besides, the invention discloses an active and passive hybrid vibration isolator on the basis of the laminated type PVDF actuator. Compared with common passive vibration isolators, vibration in wide frequency range and particularly vibration near natural frequency of the system can be more effectively isolated by the vibration isolator so that appropriate working environment of the instrument is ensured. Meanwhile, volume, mass and structure of the vibration isolator are smaller than those of the passive vibration isolators.

The invention provides an image classifier generating method and device as well as an image classifying method and device. The method for generating an image classifier for form sorting equipment comprises the following steps: extracting a plurality of local features from each sample image in a plurality of sample images; dividing the sample image into a plurality of sub-areas; grouping local features which are extracted from the sample images and at least associated with the same sub-area into a same group; generating a search tree corresponding to the same sub-area according to the local features in the same group to serve as the image classifier.

The invention provides a cutter frame system of a grating ruling engine, and belongs to the field of grating ruling machinery. The cutter frame system aims at solving the problems that machining and assembly in the prior art are large in difficulty and large-area grating ruling is not benefited. A sliding block of the cutter frame system is arranged on a guide rail in a cross mode and slides along the guide rail. A horizontal surface and a second side surface of the sliding block are provided with guide sliding feet, a first side surface is provided with elastic sliding feet, and the elastic sliding feet and the guide sliding feet are contacted with the guide rail. A cutter frame installation plate is movably connected with a joint through a pin shaft, the lower end of the cutter frame installation plate is provided with guide sliding feet which are contacted with the guide rail, a ruling cutter frame is fixedly connected with the cutter frame installation plate, and the elastic sliding feet tightly press one guide sliding foot of the ruling cutter frame on a guide face of the guide rail. A single rectangular guide rail is used, the top face of the guide rail is used for bearing, side faces of the guide rail are used for guiding, a bearing function and a guide function are integrated on one guide rail, and therefore difficulty of the machining and the assembly is reduced. The size of the system is small and the weight of the system is low, and therefore the cutter frame system is suitable for the large-area grating ruling.

Control method and device based on an automobile line control brake system, with features of simple structure, short brake reaction time and high reliability. The control method based on an automobile line control brake system is characterized in that: an electric brake main control unit receives the brake state signals and sends the control signals to a brake control unit based on the brake state signals and the brake control unit obtains the required brake force of each vehicle wheel based on the signals sent from the electric brake main control unit and the command is sent to make the motor in the electric brake operate.

The invention belongs to the technical field of vibration noise control and particularly relates to an active vibration absorber. The magnetic resistance type electromagnetic active vibration absorber comprises a vibration absorber lower installation plate, a vibration absorber cover, a vibration absorber upper installation plate, a rotor assembly and a stator assembly. Four rolling guide rail pairs are installed between the rotor assembly and the stator assembly. The rotor assembly is connected with the vibration absorber lower installation plate and the vibration absorber upper installation plate through springs. The rotor assembly can freely vibrate through the rolling guide rail pairs. The magnetic resistance type electromagnetic active vibration absorber can be installed and used in combination with various types of passive vibration absorbers and can be arranged on a controlled object or a base at will, after a coil is electrified with alternating current, electromagnetic force is generated between the rotor assembly and the stator assembly, the stator coil generates Lorentz force, the resultant force of the electromagnetic force and the Lorentz force drives a vibration absorber rotor to move, the vibration absorption force generated by the vibration absorber rotor is used for offsetting the vibration of the controlled object, and the purpose of controlling vibration is achieved.

The invention relates to universal polycarboxylic water reducer and preparation method thereof. The universal polycarboxylic water reducer is in liquid state, and the solid content of the universal polycarboxylic water reducer is 40%. The universal polycarboxylic water reducer containing carboxyl, sulfonyl and polyoxyethylene side chains is prepared by aggregation of modified polyoxyethylene ether or polyoxypropylene ether with (methyl) acrylic acid or itaconic acid, sodium methylallyl sulfonate and the like under the action of chain initiator and chain transfer agent. The universal polycarboxylic water reducer prepared by the method is low in alkali content and high in water reducing rate. When the universal polycarboxylic water reducer is added into concrete by the cementing material weight ratio of 0.25-10%, operation of the concrete is laborsaving, and cement mixture has high liquidity, falling protection capacity and workability. The universal polycarboxylic water reducer and the preparation method thereof are simple in process, easy to control and free of environment pollution. The polycarboxylic water reducer which is used as an important component of high-performance concrete is widely applicable to pre-mixed and cast-in-situ concrete for various industrial and civil buildings, and especially has excellent performance in high-strength concrete.

The invention discloses a double-screwdriver output-based insulation puncturing clamp installation operation tool and belongs to the electric connection field. The installation work tool comprises aninsulated long rod, a bottom plate, a bus-bar positioning device which is arranged on the bottom plate, a clamp clamping device, a sub-line clamping device, a striking device, and a motor unlocking device which is disposed on the insulated long rod. Compared with the prior art, the installation tool has the advantages of small size, light weight, simplicity and easiness in use, and convenience insingle-person operation; the synchronous output of double screwdrivers is stable, the positioning of sub-busbars is reliable, and therefore, the reliability of an installation process is ensured, installation accuracy and installation efficiency can be improved; and the tool also has a long-distance remote control unlocking function, one-key unlocking can be realized, the insulation distance of manual operation is far, and therefore, personal safety can be ensured.

The invention discloses a rope-driven multi-joint flexible mechanical arm. The rope-driven multi-joint flexible mechanical arm comprises a plurality of joint rod units connected in series in the axialdirection, wherein in any two adjacent joint rod units, the bottom end part of one joint rod unit is sleeved with the top end of the other joint rod unit, the top end of one joint rod unit is flexibly connected with the top end of the other joint rod unit through a spring assembly, the bottom end of one joint rod unit is flexibly connected with the top end of the other joint rod unit through a spring assembly, and a plurality of rope penetrating holes are formed in each joint rod unit. External contact or collision force of the mechanical arm can be rapidly dispersed through a load path formed by the joint rod units and the spring assemblies, so that rigid collision impact between the mechanical arm and a target is avoided, and the mechanical arm is suitable for non-cooperative target capture; and by elastically deforming the spring assemblies, relative rotation between the joint rod units is driven, so that bending deformation of the mechanical arm is controlled.

The invention discloses a pipeline vibration active control system with a band gap characteristic, and belongs to the technical field of vibration control in the field of machinery. The system adoptsthe band gap characteristic of a periodic structure and an intelligent damping material to control pipeline vibration. The system comprises a pipeline, a piezoelectric sensor, a signal conversion unit, an upper computer, an active controller, a voltage amplifier, a viscoelastic damping layer and piezoelectric ceramic, wherein the viscoelastic damping layer is periodically attached to the outer wall of the controlled pipeline. The piezoelectric sensor receives a vibration signal of the pipeline, the vibration signal is input to the active controller and the upper computer through the signal conversion unit to be calculated to obtain a feedback signal, the feedback signal is transmitted to the piezoelectric ceramic piece attached to the outer wall of the controlled pipeline through the voltage amplifier, and the piezoelectric ceramic piece deforms to enable the viscoelastic damping material to generate shear deformation. Due to the band gap characteristic of the periodic structure, the propagation of vibration of a specific frequency is attenuated in the structure. The two effects are combined to reduce the vibration amplitude of the pipeline.

The invention provides a micro-vibration active and passive integrated vibration isolation device for a reaction flywheel. The vibration isolation device includes an upper cover plate, a supporting unit and a lower bottom plate. The vibration isolation device is installed between the reaction flywheel and the spacecraft deck, and is used to reduce the impact of the disturbance force generated by the reaction flywheel on the stability of the spacecraft platform and the pointing accuracy of sensitive loads, while ensuring the attitude control moment of the reaction flywheel Passed normally to the spacecraft deck.

The invention provides an active cooling and combustion decoupling system of a scramjet engine. According to the active cooling and combustion decoupling system of the scramjet engine, a first wall face cooling channel is arranged on an air inlet channel and an isolation section of the scramjet engine, and a second wall face cooling channel is arranged on a combustion chamber and an exhaust nozzleof the scramjet engine. In the combustion chamber and exhaust nozzle area with high thermal loads, supercritical carbon dioxide is used for absorbing heat and raising the temperature through the second wall face cooling channel. Hydrocarbon fuel is adopted for cooling in he air inlet channel and the isolation section with low thermal loads. According to the system, active cooling and combustion decoupling of the scramjet engine can be achieved, meanwhile, the flow of fuel needed for cooling can be reduced, and the cooling pressure of the scramjet engine is relieved.

The invention provides a permanent magnet driver. A power disc and a load disc are made of insulating diamagnetic materials or made by combining the insulating diamagnetic materials and materials with other physical properties and are respectively provided with permanent magnets, and the purpose of transmitting torque is realized through using magnetizers to emit magnetic field waves and combining a magnetic focusing effect and the Li's pull and push magnetic circuit theory. The purposes of torque adjustment and speed changing are realized by adjusting the distance between the power disc and the load disc or adjusting the coupling position of the relative magnetic field of the power disc and the load disc, and the main purposes of saving energy and reducing consumption are further realized.

The invention discloses an assembling combined type blade of a large-scale wind driven generator, aiming at solving the problems of cost and transportation difficulty caused by integrally manufacturing of the existing large-scale wind power blade. The assembling combined type blade of the large-scale wind driven generator comprises a plurality of blade sections from the blade root to the blade tip, all blade sections are serially connected sequentially to form a whole blade, each blade section comprises a skin, a beam cap and a web and is divided into a connecting area, a transition area and a common section area, a plurality of grooves are arranged on the connecting area in the periphery direction, a plurality of screw holes are arranged in the beam cap at the connecting area, one end of a screw which penetrates through the screw hole is fixed in the groove corresponding to the connecting area of the blade section, and the other end of the screw which penetrates through a connecting piece of the connecting area of the adjacent blade section is connected with a locknut. The assembling combined type blade of the large-scale wind driven generator reduces the requirement for the transport vehicle of the integrated blade, reduces the transportation cost, and especially greatly reduces the additional investment of constructing a dedicated road for transporting over-length blade when a wind field is built in a mountainous area.

The invention provides an exchange apparatus and method for a double-workpiece stage based on double-guide rail double-drive step scanning, belonging to the technical field of manufacture equipment for semiconductors. The exchange apparatus comprises a base station and workpiece stages located at an prealigning station and an exposure station; four Y-oriented rectilinear motion units and two X-oriented rectilinear motion units are preset on a balancing mass, and three-phase exchanging of the workpiece stages between a prealigning area and an exposure area is finished through butt joint between rectilinear motor stators of the Y-oriented rectilinear motion units and Y-oriented transitional rectilinear motion units; a first Y-oriented rectilinear motor mover 1 is fixedly connected with a first workpiece stage, a fourth Y-oriented rectilinear motor mover 1 is fixedly connected with a second workpiece stage, and the Y-oriented rectilinear motion units and the X-oriented rectilinear motion units form a double-guide rail double-drive structure at the exposure station. According to the invention, during exchanging of the workpiece stages, three phases are employed, which allows exchanging efficiency to be improved; in specific embodiments of the invention, the advantages of small inertia of motion, short time for stabilization, great structural rigidity, centroidal driving at the exposure station and the like are realized.

The invention relates to a crankshaft follow-up abrasive belt grinding device. The device is provided with an abrasive belt used for grinding a crankshaft connecting rod neck, a driving wheel used for driving the abrasive belt and a pair of upper and lower supporting wheels used for supporting and tensioning the abrasive belt, wherein the abrasive belt is wound on the driving wheel and the upper and lower supporting wheels. Under the driving of the driving wheel and the supporting and tensioning effect of the upper and lower supporting wheels, the moving direction of an abrasive belt grinding area is vertical to the X axis. The tangential direction between the abrasive belt and a grinding point of a workpiece is kept unchanged by the device and is always vertical to the reciprocating moving direction (the X axis) of the whole set of device. Compared with the traditional grinding wheel follow-up device of which the tangential direction of the grinding point is changed all the time during the same period, the crankshaft follow-up abrasive belt grinding device has the advantage that the grinding point moves at constant speed (A-B-C-D-A) along with the uniform rotation of the C axis, the principle is simple, and movement control and crankshaft shape error compensation are convenient to perform. The device provided by the invention inherits the characteristic of high efficiency of the traditional abrasive belt grinding, and can be applied to crankshaft rough machining, grinding substitutes turning and milling, the device can also be applied to precise machining of a crankshaft, and control on size and shape is realized.

The invention relates to a brake gap automatic regulating wedge mechanism in an arrester, and its technical solution: it comprises casing, wedge, compression spring, trolley, piston, roller push block, piston spring, driving ring, driving ring spring and regulating bolt, where the a vertical hole I and a horizontal through hole II are arranged in the casing, the outer end of the through hole II is provided with a conical plane P, the driving ring is arranged inside the conical plane P, one end of the driving ring spring supports against a shield and the other end supports against the driving ring to press the driving ring on the conical plane P, the piston is connected in the through hole II in sliding mode, the rear end of the piston is hinged with the roller push block, and the front side of the piston is provided with a spiral tooth, which is arranged in a spiral groove inside the driving ring, there is an axial gap ª€ between them, two sides of the lower end of the wedge are symmetrically hinged with trolleys corresponding to the roller push block, the regulating bolt is screwed with the piston and the front end of the regulating bolt is connected with an active fastening hoop. Its advantages: automatically compensating the brake gap; simple structure and low cost; not heating, low noise and not deflection.

The invention discloses a supercritical carbon dioxide circulation and sea water desalination coupled vessel nuclear power system which comprises a reactor cabin, a ship cabin and a propelling device,the reactor cabin comprises a high-temperature gas cooled reactor system, and the ship cabin comprises a supercritical carbon dioxide power circulation system and a sea water desalination subsystem.A first-stage intermediate heat exchanger and a second-stage intermediate heat exchanger are arranged on the two sides of a high-temperature gas cooled reactor in the high-temperature gas cooled reactor system correspondingly. The supercritical carbon dioxide power circulation system is coupled with the high-temperature gas cooled reactor system through a first-stage intermediate heat exchanger and a second-stage intermediate heat exchanger. The seawater desalination subsystem is coupled with the supercritical carbon dioxide power circulation system through a precooler and an intercooler. Thepropelling device is connected with the supercritical carbon dioxide power circulation system. Vessel propulsion power and electric power are provided through the supercritical carbon dioxide circulation system, fresh water needed by the whole vessel is provided in cooperation with the sea water desalination system, the vessel is driven to sail in a direct propulsion mode, and the energy conversion rate and the device compactness are improved.

The invention discloses finger movement function rehabilitation apparatus driven by shape memory alloy wires, and belongs to the field of finger rehabilitation. The apparatus is composed of the shapememory alloy wires, ropes, an alloy wire connecting terminal, an inner-layer fabric, an outer-layer fabric, range extending mechanism supports, rings, and other parts. When the shape memory alloy wires are powered on, the temperature rises under the current heat effect to generate phase changes, the contraction is generated, then the ropes are pulled, and fingers are driven to bend and stretch. The fabrics on the inner layer and the outer layer have good elasticity, and the tightness degree of the whole fabric can be adjusted in cooperation with Velcro on an arm. In addition, a proper amount of silica gel is placed between each layer of fabric to improve the wearing comfort of the apparatus. A length of the alloy wires extending out of the connecting terminal at the tail end is adjusted toadapt to different finger lengths, so that the requirement of ergonomics is better met. The three Velcro are located on the wrist, the forearm close to the elbow, and the big arm close to the elbow respectively. The three Velcro can enable the rehabilitation apparatus to be better attached to the shape of the arm of the human body, so that range extending mechanisms more efficiently use the phasechange contraction of the SMA wires to drive the fingers to bend and stretch, and thereby the better rehabilitation effect is achieved.

The invention discloses a multi-level cascading inverter with coupling inductors, wherein N inversion units are connected in parallel; each single-phase H bridge is corresponding to one coupling inductor; N is greater than or equal to 2, and N is a natural number; the upper bridge arms on the left bridge arm side of the same single-phase H bridge inversion unit are first power switch tubes; the lower bridge arms on the left bridge arm side of the same inversion unit are second power switch tubes; the upper bridge arms on the right bridge arm side of the same single-phase H bridge unit are third power switch tubes; the lower bridge arms on the right bridge arm side of the same single-phase H bridge unit are fourth power switch tubes; the first power tubes, the second power tubes, the third power tubes and the fourth power tubes are all insulated gate bipolar transistors (IGBT); and the N coupling inductors are connected through cyclic symmetrical structures. According to the multi-level cascading inverter with the coupling inductors, the loop current among the branch circuits can be effectively restrained under a condition of not requiring a complex current-sharing control method; and under the condition of the same parallel-connection common-mode inductance, the multi-level cascading inverter has the advantages of high difference mode current-sharing inductance, good current-sharing effect, small apparatus volume, and the like.