2143results about How to "Simple control method" patented technology

Disclosed herein is a solid-state image pickup device including: a plurality of unit pixels each having: a charge generating section for generating a charge, a charge storage section for storing the charge generated by the charge generating section, a transfer gate section disposed between the charge generating section and the charge storage section for transferring the charge generated by the charge generating section to the charge storage section, and a pixel signal generating section for generating a pixel signal corresponding to the charge stored in the charge storage section; an unnecessary charge discharging gate section in each the unit pixel, switchable to block a flow of an unnecessary charge that is generated in the charge generating section and does not contribute to image formation, according to height of an electric barrier; and an unnecessary charge drain section disposed on an opposite side of the unnecessary charge discharging gate section from the charge generating section for receiving the unnecessary charge swept out of the charge generating section through the unnecessary charge discharging gate section.

A motor control system for a brushless and sensorless DC motor for driving a compressor, pump or other application, includes a protection and fault detection circuit for detecting a locked rotor and a rotor which has stopped because of lost rotor phase lock. The motor control system also includes an off-the-shelf motor control integrated circuit having an input for disabling power outputs to the motor phase coils. The protection and fault detection circuit uses a back EMF sampling circuit coupled to the motor phase coils and momentarily disables power to the motor phase coils, via the motor control integrated circuit input, to determine if the motor rotor is rotating. The system also monitors supply voltage, supply current, temperature, and motor speed limits to detect faults and protect system components.

The invention discloses an optical flow-based four-rotor unmanned aerial vehicle flight control method. The method comprises the following steps: calculating optical flow information by utilizing an image pyramid-based Lucas. Canard method; processing the optical flow information by adopting a Kalman filtering method; performing data fusion on an optical flow and an attitude angle, and calculating the horizontal displacement of an unmanned aerial vehicle; and designing a proportional-differential controller, including determining a four-rotor unmanned aerial vehicle dynamic model and designing a control algorithm. By the optical flow-based four-rotor unmanned aerial vehicle flight control method disclosed by the invention, the horizontal position information of the unmanned aerial vehicle is calculated by fusing the image information and the attitude angle information acquired by utilizing an airborne camera; and the position of a small unmanned aerial vehicle is controlled by taking the unmanned aerial vehicle horizontal position information as the feedback information of an outer ring PD (proportional-differential).

The invention relates to a method for controlling a rice pressure cooker comprising a housing (10) closed by a cover (12), said housing (10) being provided with heating means (17, 18, 19), a controlled purge valve (20) and a temperature sensor (15), said method being characterised in that it comprises: a steeping step during which the purge valve (20) is kept open and the heating means (17, 18, 19) are controlled so as to keep the container (11) at a temperature of between 60 DEG C and 85 DEG C for a determined period of steeping time of between 30 minutes and 1.5 hours; a heating step starting at the end of the determined period of steeping time, during which the heating means (17, 18, 19) are controlled so as to obtain a determined nominal temperature of between 100 and 120 DEG C inside the container (11); ; and a cooking step starting as soon as the nominal temperature is reached, during which the heating means (17, 18, 19) are controlled so as to keep the container (11) at the nominal temperature for a determined period of time of between 20 minutes and 40 minutes.

The invention relates to a tracking control method and especially relates to a distributed limited time tracking control method for formation-flying satellites. The invention aims at solving problems that the communication among formation-flying satellites is limited in a conventional formation-flying satellite control method, the control input upper limit information of a pilotage satellite is difficult to obtain, the inevitable perturbation of all satellites in a system cannot be considered, and the formation is longer in time. The method comprises the following steps: 1, building a double-satellite relative movement dynamic model; 2, building a relative dynamic model of the formation-flying satellites relative to a reference point; 3, designing a distributed limited time tracking control rule. The method solves a problem that the communication among formation-flying satellites is limited in the conventional satellite formation control method, considers the inevitable perturbation of all satellites in the system, and can complete the formation in a shorter time. The method can be used in the field of tracking control.

The invention discloses a cutting-stirring friction welding composite processing device for a floating double-shaft-shoulder double-stirring needle and a manufacture method thereof, and particularly relates to a combined or composite processing device capable of simultaneously carrying out milling or cutting processing and stirring friction welding processing and a method thereof. The cutting-stirring friction welding composite processing device for the floating double-shaft-shoulder double-stirring needle integrates a cutting system or a milling system, a stirring friction welding system, a forced cooling system, a gas protection system, a temperature sensing system, a pressure induction system, a milling liquid supply system and a sensing-free system. The cutting-stirring friction welding composite processing device has functions of temperature control, gas protection, pressure detection, cooling liquid protection, milling head replacing and floating double-shaft-shoulder self-supporting stirring friction welding. The method for carrying out cutting-stirring friction welding composite processing on workpieces can meet strength requirements of mechanical processing of ferrous light metal materials, carbon steel materials and alloy steel materials. The cutting-stirring friction welding composite processing device for a floating double-shaft-shoulder double-stirring needle and the manufacture method of the cutting-stirring friction welding composite processing device reduce manufacture procedures, save processing cost, have the advantages of being high in efficiency, excellent in quality, high in stability and saving in energy, break through limitation of conventional machining technology, form a new method and a new thought for machinery processing, and have wide application prospects in industries of heating, air conditioners, ice manufacture, freshness keeping, medicine preparation, construction, aquatic products and foods.

The invention relates to a computer binocular vision denture scanning device and a three-dimensional reconstruction method thereof. The device comprises a linearly structured light vision collection part, a rotary measuring bed, a control part of the rotary measuring bed, and a box, wherein two high resolution digital charge coupled device (CCD) cameras are positioned on the central sides above the rotary measuring bed and the control part of the rotary measuring bed and symmetrically distributed by taking the linearly structured light laser as the centre in the linearly structured light vision collection part; first and second accessories in the rotary measuring bed and the control part of the rotary measuring part are arranged on the rotary measuring bed; the rotary measuring bed is driven by a driving mechanism to rotate; and the structures are arranged in the box. The method comprises: placing a denture on the rotary measuring bed; allowing the linearly structured light laser to project laser on the denture; driving the rotary measuring bed to rotate continuously by the driving mechanism; and taking pictures by two CCD cameras and transmitting the pictures to an external control computer to process the pictures to obtain three-dimensional data on the denture surface. In the invention, the mechanical structure and the control method need no various speed control, have no requirement on precision of spindle rotation of a motor, and are convenient to operate and high in scanning precision.

The invention discloses a direct torque control device and a direct torque control method for a permanent magnet synchronous motor. The DC bus voltage of an inverter and a current signal of the permanent magnet synchronous motor are output to a signal detection circuit; the signal detection circuit outputs the DC bus voltage and the current signal to a processor; meanwhile, a rotating speed pulse signal of the permanent magnet synchronous motor is output to the processor and is processed by the processor to form a proper switch signal which is then output to the inverter so as to control the motor. A proper voltage vector is selected from twelve synthesized voltage vectors according to a flux linkage error and a torque error and the position of the flux linkage in twelve sectors, and the duty ratio of the selected voltage vector is determined in real time according to the torque error so as to generate a proper inverter switch signal for controlling the permanent magnet synchronous motor. The number of the selectable voltage vectors in the traditional direct torque control is increased, the duty ratio of an acting vector is adjusted in real time according to the torque error, and the torque pulsation in the traditional direct torque control can be effectively reduced.

The invention relates to a wellbore trajectory control method which is mainly used for solving the problem that the existing wellbore trajectory control method can not well meet the design and control requirements of oil and gas drilling on a wellbore trajectory. The wellbore trajectory control method is characterized by comprising two parts, namely the design of the wellbore trajectory and the control of the wellbore trajectory. By adopting the method, the design and control requirements on the wellbore trajectory which can simultaneously limit the position and the direction of a target point under multi-constraint conditions can be met; and the design and control method is simple and practical, the optimization and the control of the wellbore trajectory are easy, the design efficiency and the quality of a well body can be improved, the time and the cost of drilling operation can be reduced, and the purposes of safe, fast and high-quality drilling and completion operations can be realized.

The invention discloses a permanent magnet motor system with a shared bus structure and an open winding. The permanent magnet motor system comprises a permanent magnet synchronous motor, two current inverters, a direct-current power supply and a controller. The permanent magnet synchronous motor is of an open winding structure. The current inverters are voltage source type three-phase full-bridge inverters. The direct-current sides of the two current inverters are connected to the same direct-current power supply. Due to the fact that the direct-current sides of the two current inverters are connected directly, three current loops are formed in the structure. The invention further discloses a control method for suppressing a zero-sequence current of the permanent magnet motor system. According to the control method, a voltage compensator is designed for correcting the given voltage of the current inverters so that the zero-sequence current can be reduced substantially. According to the permanent magnet motor system, since the two current inverters share the same direct-current power supply, the structure is simple, cost is low, and operating performance and efficiency are high under the condition that the zero-sequence current is well suppressed.

The invention discloses a solar energy storage, ventilation and heating system, which comprises a heat storage wall composed of a heat-insulation layer, a heat storage layer and an aluminum plate painted with black paint, a heat storage ventilation channel or a combination thereof, which are sequentially arranged on the outer side of the external wall of a building; a transparent cover plate arranged on the outer side of the heat storage wall or the heat storage ventilation channel; an air sandwich between the transparent cover plate and the heat storage wall; and an upper vent and a lower vent having valves and arranged on the transparent cover plate and the heat storage wall. The solar energy storage, ventilation and heating system can achieve intermittent ventilation and heating without consuming non-renewable energy by using the special heat absorption and release functions of a phase-change heat storage material and by controlling the valves of the vents. The system has the advantages of energy conservation, environmental protection, simple control and handsome structure, and can be widely used for common residential buildings and public buildings.

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.

A memory storage device includes a host interface to be connected to a terminal host, a controller connected to the host interface, and a fingerprint sensor and a memory module both connected to the controller. The controller communicates with the terminal host by handshakes and causes the terminal host to automatically run a suitable driver and a suitable application program from the memory module to the terminal host. The terminal host receives an instruction from a user through the driver and the program and informs the controller to control the fingerprint sensor to read to-be-recognized fingerprint data of the user. The terminal host utilizes the application program to process and judge whether or not the to-be-recognized fingerprint data substantially matches with template fingerprint data stored in the memory module, and further enables a specific block of the memory module to be accessed by the terminal host according to a matching result.

The invention discloses a traffic time period control method for improving the traffic efficiency of adjacent intersections of main roads. The method comprises the following steps: on the basis of traffic demand distribution information of urban main roads, obtaining main road traffic demand OD information of different time periods each day through the multi-source data analysis technology, obtaining traffic demand amounts, real-time vehicle arrival rates and vehicle queue lengths of entrance lanes of adjacent intersections to be optimized of the main roads during different time periods, andtaking the sum of all OD amounts of all directions of the entrance lanes of the intersections within a certain time period as the traffic demand amount of the direction within the time period. According to the traffic time period control method disclosed by the invention, the signal control of the entrance lanes of the adjacent intersections is optimized based on the historical data traffic information, so that the occurrence of the decline of the traffic capacity of the adjacent intersections can be prevented more effectively, the occurrence of traffic congestion is avoided, the traffic efficiency of the intersections is maximized, the control method is easy to implement, and the traffic time period control method has a wide application range and a good application prospect.

The invention discloses an electric field coupled power transfer system and a control method based on the novel topology. The system comprises a high-frequency inverter, a high-frequency resonator, an electric field coupling mechanism and an electric energy conversion link, and is characterized in that the high-frequency inverter is a double-E type amplifying high-frequency inverter, a high-frequency transformer is arranged between the high-frequency inverter and the high-frequency resonator, the high-frequency resonator is further connected with a controller, and the output end of the controller is connected with an inductance compensation tuning module and a drive circuit. The electric field coupled power transfer system has the obvious effects that the high-frequency voltage at the two ends of a coupling mechanism is increased, the strength of an electric field is enhanced, the transmission distance is lengthened, the voltage at the two ends of a high-frequency switch tube is increased to meet the requirement of high-frequency power electronic devices at the present stage, the power capacity of the system is improved, the voltage of the switch tube is reduced, the switch loss is reduced, and the adaptive ability of the system is improved.

The invention discloses a control method and device for a mechanical arm of an unmanned aerial vehicle. The method comprises steps as follows: wearable sensing equipment acquires motion information of an arm of a user and sends the motion information to a first controller, and the first controller filters and encodes the motion information to generate a control command and sends the control command to a wireless emitter of a terminal; and the wireless emitter of the terminal sends the control command to the unmanned aerial vehicle, a second controller of the unmanned aerial vehicle decodes the control command to acquire control information, and the mechanical arm of the unmanned aerial vehicle moves according to the control information. With the scheme, high-precision remote real-time synchronous control on the mechanical arm of the unmanned aerial vehicle is realized, the stability is high, the control method is simple, and complex control actions can be completed, so that the mechanical arm adapts to tasks in complex environments.

A display device, including a substrate; an array of pixels arranged in rows and columns forming a light-emitting area over the substrate, each pixel including a first electrode, one or more layers of light-emitting material located over the first electrode, and a second electrode located over the one or more layers of light-emitting material; a first serial buss having a plurality of electrical conductors, each electrical conductor connecting one chiplet in a first set of chiplets to only one other chiplet in the first set in a serial connection, the chiplets being distributed over the substrate in the light-emitting area, each chiplet including one or more store-and-forward circuits for storing and transferring data connected to its corresponding electrical conductor; and a driver circuit in each chiplet for driving at least one pixel in response to data stored in the store-and-forward circuit.

A control method for automatic leveling system in automatic control technology field comprises steps of: automatically protruding transverse support legs in turn; automatically protruding vertical support legs to touchdown in turn; automatically lifting the vertical support legs to take off from ground in turn; stopping the vertical support legs; estimating a lowest leg according to alpha, beta angles in X, Y directions respectively, calculating leveling effect parameter; executing rough leveling if s>Psi1; executing accurate leveling if Psi2<=s<=Psi1; stopping the leveling if s F16M 3 / 00 G05D 3 / 10 2 7 3 2008 / 5 / 22 101280875 2008 / 10 / 8 000000000 Shanghai Jiao Tong University Shanghai 200240 Weng Xinhua Tang Junmao Kong Zuo Wu Changmao Gan Zhimei wangti lin wanggui zhong 31201 The Patent Agency of Shanghai University of Communications No.1954 Huashan Road, Shanghai 200030

The invention discloses an asymmetric direct power control method of grid-connected three-phase Voltage Source Converter (VSC). Instantaneous active and reactive powers of VSC inputted from electricity grid are calculated by collecting three-phase network voltage and input current signals of the VSC, and the error signal between the instantaneous active and reactive powers and given active and reactive powers is adjusted by using a proportional resonance adjuster; the output signal of the adjuster obtains the VSC output reference voltage signal of synchronous rotary coordinate system after feedback compensation decoupling, and a switch signal controlling VSC operation condition is produced after spatial vector pulse-with modulation. The method in the invention can eliminate double frequency wave motion of direct-current busbar voltage and instantaneous reactive power due to asymmetric electricity grid voltage without decomposition of positive-negative sequence component, thereby avoiding incoming decomposition delay and error, and thus being capable of improving dynamic response and stable operation ability of VSC in the condition of asymmetric electricity grid failure.

The invention discloses a constructing method of a nerval net generalized inversing bearingless permanent magnet synchronous motor decoupling controlling device, which takes two Clark inverse transformations, two electric current tracing type inverters, a bearingless permanent magnet and a load model as a whole to form a composite controlled object, a nerval net generalized inverse of the composite controlled object is formed through adopting static nerval net added with a plurality of linear links, then the nerval net generalized inverse is reversely arranged before the composite controlled object to form a generalized pseudolinear system, the generalized pseudolinear system is decoupled to three single input and output subsystems through linearization, finally a nerval net generalized inverse, the two Clark inverse transformations and the two electric current tracing type inverters are all formed to a nerval net generalized inversing bearingless permanent magnet synchronous motor controlling device, the controlling device can not only realize dynamic decoupling between a radial position system of a motor and torque moment system and between radial forces, but also be taken as a nonlinear open-cycle controlling device to use directly, and stable suspension and operation of a rotor of a motor can be ensured.

The invention discloses a polyphase permanent magnet synchronous motor current waveform optimal control method, comprising the following steps of A, current reference value coordinate transformation; B, current multiple proportion resonance regulation; and C, coupling compensation. In the control method, based on polyphase permanent magnet synchronous motor vector control, a polyphase synchronous rotating coordinate system current reference value is transformed to a current reference value of each phase in a polyphase static coordinate system through polyphase coordinate transformation, the current reference value of each phase and a current feedback value of each phase of a motor are respectively subjected to improved multiple superposition proportion resonance regulation, and a resonance separation method is introduced, decoupling is realized by feed-forward compensation, and floating tracking and harmful subharmonic restraining for highly dynamic property fundamental waves and usable subharmonic are realized. The method can restrain the adverse impacts, such as motor loss, torque ripple and vibration noise, caused by a harmful harmonic current of the polyphase motor, can explore the positive effects of the usable harmonic current, gives full play to the advantages of the polyphase motor and improves the system performance.

The invention provides a system for achieving dynamic wireless constant power charging and a control method for the system. The system comprises an energy transmitting module, an energy receiving module and a constant power tracking control module, wherein the energy transmitting module is used for converting a primary direct current power supply into high-frequency alternating current electrical energy and transmitting the high-frequency alternating current electrical energy in a high-frequency magnetic field coupling manner; the energy receiving module is used for receiving electrical energy and supplying the electrical energy to a load; the constant power tracking control module is used for obtaining a reference control signal according to charging current collected in real time, and adjusting voltage of a rectifying port into a reference control signal to achieve a constant power tracking control. With direct current output by a DC / DC converter at a secondary side as feedback quantity, direct current voltage of an uncontrollable rectifier terminal is disturbed by a perturbation and observation method-based constant power tracking control method; and a transmission voltage gain from the primary side to the secondary side always works on a voltage gain point corresponding to a transmission power extreme point, so that the condition that the system transmits the electrical energy at constant power is ensured, and the output power is kept stable.

The invention discloses a non-location sensor technology for three-phase electro-magnetic double-salient pole machine starting and low-speed accelerating processes. According to the characteristics of an electro-magnetic double-salient pole machine, exciting current is not applied in a static state, but fixed-cycle low voltage pulse signal judging phase current is applied on armature windings, double-phase series connection self inductance is then calculated, and a rotor position is estimated. During a low-speed accelerating process, the mutual inductance sum of two phases of series connection windings and an excitation winding is calculated according to the armature current gradient when chopped waves are acquired in real time, so that the non-location low-speed accelerating technology for accelerating a motor is carried out. By utilizing the method, the initial rotor position can be accurately positioned, a rotor sector can be identified and fed back in real time during the low-speed accelerating, the maximum inductance is obtained through comparison, and the phase shifting time is determined after time delay. Consequently, the rotor positions can be fed back during the whole starting and accelerating processes, so that the motor cannot be out of step during the starting process and has strong antijamming capability. By utilizing the technology, the three-phase electro-magnetic double-salient pole machine can be enabled to start and accelerate stably and reliably.

The invention discloses an on-line coordination control method for the plate shape and plate thickness of a strip tandem hot continuous rolling mill, belonging to the technical filed of hot continuous rolling of sheets and strips. The method is characterized by comprising the following steps: (1) collecting n rack hot continuous rolling mill equipment and rolling schedule parameters; (2) collecting the roll force and the convexity offset value of a last rack plate in situ; (3) calculating the plate shape stiffness of each rack; (4) keeping the thickness of the outlet of the tail rack to be constant; (5) inversely calculating the convexity variable quantity of the mechanical plate of the i rack from the tail rack; (6) calculating the roll force and the variable quality of the thickness of the inlet of the i rack; (7) calculating the thickness of the new inlet and outlet of the i rack; (8) calculating the rolling reduction and adjusted quantity of the i rack; (9) calculating the convexity variable quantity of the outlet plate of the (i-1) rack according to the equi-proportional convexity condition; (10) repeating steps from (5) to (9) to obtain the rolling reduction and adjusted quantities of 2nd to n racks; (11) calculating the rolling reduction and adjusted quantity of the first rack; and (12) carrying out on-line coordination control according to the rolling reduction and adjusted quantities, thereby achieving the purpose of coordination control on the plate shape and plate thickness.

The invention discloses a sine wave inverter parallel system with variable current ratio, which is characterized by comprising a monitoring management unit and one or a plurality of inverter power supply modules in redundancy parallel operation; the monitoring management unit is connected with all the inverter power supply modules through a communication signal wire; the inverter power supply modules are mutually connected by the communication signal wires, synchronous signal wires and average current signal wires; and each inverter power supply module is simultaneously connected with a DC (Direct Current) input end and an AC (Alternating Current) output end. The proportion of the load current shared by each module of the parallel system provided by the invention can be set as required so as to meet the requirements on uniform load current sharing (current equalization) by parallel inverter power supply modules with same capacity or load current sharing by the inverter power supply modules with different capacities in the parallel system according to different proportions, so that the parallel function of the inverter power supply modules with different capacities is realized.

The invention discloses an electric automobile wheel type driving control system based on hierarchical control. The electric automobile wheel type driving control system based on the hierarchical control comprises an integrated controller, hub motor rotation speed sensors, a vehicle vertical and horizontal acceleration sensor, a yaw velocity sensor, a steering wheel steering angle sensor, an electronic accelerating pedal, an electronic braking pedal, a GPS receiver, a power battery, a battery management system, hub motors, inverters, an SRAM memory, an external clock module and a liquid crystal display module; the integrated controller comprises an auxiliary module, an upper module, a middle module and a lower module; the auxiliary module is used for judging the motion state of an automobile and estimating road adhesion coefficient and state variable in the automobile running process; the upper module is in charge of estimating expected vehicle reference velocity and yaw velocity; themiddle module is used for calculating yawing moment and driving force of the automobile by using a sliding mode control method; and the lower module outputs the voltage values of the inverters to control the hub motors to rotate and synchronizes the rotation speeds of the hub motors during high speed linear running.

The invention discloses a STATCOM unbalance compensation control method based on a modular multilevel converter (MMC). The method comprises a converter compensation current dead-beat control method and a converter interphase circular current active damping control method. A comprehensive compensation current dead-beat control part is used for compensating active loss in the MMC by controlling active current, reactive current and negative-sequence current which are output by the MMC so as to eliminate unbalance of the current of a power grid and compensate reactive power; the interphase circular current active damping control method is used for summing by detecting the bridge arm current of upper and lower bridge arms of each phase and multiplying by 0.5 to obtain the circular current of each phase, and superposing the output of three-phase current passing through an active damping controller to dead-beat control output so as to inhibit the alternating current component of the circular current, reduce the current stress of converter devices and reduce the loss of the converter. Through the adoption of the method provided by the invention, compensation of the negative-sequence current and reactive current of unbalanced load of the power grid is realized, inhibition of the interphase double frequency circular current of the MMC is simple, the response speed is high and the stability is high.

The invention discloses an air conditioner and an air-out control method thereof. The air-out control method comprises the following steps: (1) controlling an infrared sensor of the air conditioner to carry out rotatable scanning operation with the purpose of obtaining temperature information, (2) generating the temperature curve of an indoor heat source based on temperature information, (3) determining the distance between the position of the heat source and the air conditioner, (4) performing air-out control over the air conditioner based on the position of the heat source and the distance between the heat source and the air conditioner. Without requiring an array infrared sensor, the control method is simple and easily applied. The invention further discloses the air conditioner.

The invention provides a semiconductor device capable of appropriately debugging any fluctuation in element characteristic even when the element characteristic fluctuates exceeding a value estimated at the designing stage. This semiconductor device includes a process monitor circuit that monitors any fluctuation in process and outputs a monitor signal M representing a result of monitoring, in addition to circuit blocks that perform respectively required functions. And a timing control circuit that controls timing of an input signal inputted to a predetermined circuit element forming the circuit blocks based on the monitor signal M from the process monitor circuit is provided in the circuit blocks.

The invention discloses a parallel inverter current control method adopting voltage differential compensation, which comprises: adopting a LCL wave filter composed by capacitor and damping resistor in series connection to connect with a PWM inverter and power network; adopting a current transmitter to detect the current in the inductor on the power network side of the wave filter and obtain power network current signal; adopting a piezoelectric sender to detect the capacitor branch voltage of the wave filter and obtain current compensation signal by the RC differential circuit; combining the two signals into one signal as a feedback signal for current control of the inverter; comparing with the control given signal of the power network current to obtain error signal; and adjusting and controlling the output of the PWM inverter by proportional integration, wherein, the transformation ratio of the piezoelectric sender and the RC differential time constant are determined by the LCL wave filter parameter. Compared with conventional current feedback control methods, the invention can reduce the damping resistance of the LCL wave filter, thereby reduce the loss caused by damping resistance and improves the ability of the wave filter for inhibiting the ripple current of the inversion switch.