50results about How to "Guaranteed Phase Consistency" patented technology

The invention provides an image data transmission circuit of a satellite-borne high-resolution CCD (Charge Coupled Device) camera, relating to the technical field of aerospace optical remotely-sensed imaging technology and solving the problem that the performance of the data transmission circuit is reduced after data transmission because the transmission of image data of a single channel of the traditional satellite-borne CCD remote sensing camera needs coordination of a plurality of differential driver integrated circuits. The image data transmission circuit comprises a high-speed serial differential transmitting circuit at a transmitting end and a high-speed serial differential receiving circuit at a receiving end. The high-speed serial differential transmitting circuit receives image data, line synthesizing signals and data clock output by a satellite-borne high-resolution CCD; the image data, the line synthesizing signals and the data clock are subjected to parallel-serial conversion and differential driving through a high-speed LVDS (Low Voltage Differential Signaling) serializer to output four groups of high-speed serial LVDS signals; and the four groups of LVDS signal flows are transmitted to the high-speed serial differential receiving circuit through an LVDS transmission cable. By means of the image data transmission circuit provided by the invention, the size, the weight and the power consumption of a data transmission link of the satellite-borne high-resolution CCD camera are reduced, and the quality of image transmission is effectively ensured.

The invention discloses a data transmission method and a data transmission system based on serial peripheral interface (SPI) data transmission timing sequences. The data transmission method based on the SPI data transmission timing sequences comprises the following steps: outputting SPI clock in effective status by a main device and sending a read\write mark of 1 byte, a start address (SA) of 2 byte and read\write data length (Len) of the 2 byte, receiving the read\write mark, SA and Len by a secondary device according to the SPI clock output by the main device and the SPI data transmission timing sequences, and sending data with SA and Len byte as a first address to the main device according to the SPI data transmission timing sequences and the read\write mark or storing the data of the Len byte received by the main device to local storage space with SA as the first address. Due to the fact that the Len byte is sent continuously in one frame data, and the data of the Len byte do not need to be sent by being placed on Len frame data like the prior art, transmission effects are improved largely.

This invention relates to a calibration network of an intelligent antenna including a metal plate opened with multi-set of couple windows, transmission lines above the metal plate corresponding to the couple windows, transmission lines below the metal plate and a power distributor circuit, the transmission lines above or below the plate and the corresponding windows make up of a coupler, all the branches of the power distributor are connected with the transmission lines under the metal plate, which can guarantee the consistency of the amplitudes and phases from the calibration port to the antenna port.

The invention provides an extensible microphone array and an establishment method thereof. A synchronous sampling mechanism between chips is adopted, and adc synchronous sampling of the chips is controlled through a gpio, so that a phase difference of multi-channel adc data is ensured to be within 1 microsecond, and synchronous operation of the chips is guaranteed; each chip independently completes noise reduction, echo cancellation or a beam forming algorithm of the double microphones, so that the system overhead can be effectively dispersed, and the load of the whole system is reduced; audiodata processed by a single slave chip is cascaded and transmitted to a main chip to complete algorithm processing of the microphone array, the system is expanded to any number of microphone arrays through cascading, and meanwhile, the chips form the microphone array, so that compared with a single-chip multi-adc scheme, the cost is lower and the expansibility is more flexible.

The invention discloses a spherical antenna near-field calibration and scanning method and system and a terminal, and belongs to the technical field of antenna tests. The channel calibration comprises the steps that space coordinates and orientation information of all channels in a spherical antenna on a spherical surface are obtained, and then the spherical coordinate mapping relation between all the channels and a six-axis mechanical arm is calculated; the six-axis mechanical arm carrying the test probe is controlled to move to each channel of the spherical antenna; amplitude and phase data of each channel are collected, an amplitude and phase data compensation table is obtained, and then amplitude and phase compensation processing is carried out on the corresponding channel in the beam combining process. By calculating the spherical coordinate mapping relationship between each channel and the six-axis mechanical arm, the six-axis mechanical arm can realize accurate spherical motion, and the test accuracy is ensured; amplitude and phase compensation processing is carried out on the corresponding channels in the beam forming process through the amplitude and phase data compensation table so as to meet the requirement for equal amplitude and equal phase of beam forming, the amplitude and phase consistency of each channel is effectively guaranteed, and then the method can adapt to high-frequency-band antenna testing.

This invention discloses a multichannel arbitrary waveform generating system. The generating system comprises a computer control module, a precise time sequence generating component and an arbitrary waveform generator; the precise time sequence generating component comprises an outer reference clock, a clock and multi-frequency signal encoding module and a data flow light fan-out module which are connected sequentially; the data flow light fan-out module is connected with the arbitrary waveform generator; the computer control module is connected with the arbitrary waveform generator, the clock and multi-frequency signal encoding module, and the data flow light fan-out module; and the arbitrary waveform generator can be used independently, and also can be extended according to the requirement to form an array of dozens of arbitrary waveform generators. By utilizing the generating system provided by this invention, the data flow containing a clock signal, a menu signal, a time delay signal and so on, is transmitted at a high speed in the form of light; thus, the delay-controllable and picosecond-jittering high-speed arbitrary waveforms with optional repeated frequencies can be outputted in multiple channels.

The invention relates to a high-precision angle measurement method of an automotive anti-collision radar based on an interference theory, belonging to the technical field of radar communication and the automotive electronics. The high-precision angle measurement of the automotive anti-collision radar of the invention is based on the interference theory of long baseline / short wavelength and co-prime wavelength, multiple groups of radar receiving and transmitting devices are used in the method, each group of transmitters provides a common-source, in-phase and uniform-amplitude local oscillator signal for the corresponding receivers thereof, and simultaneously, the group of receivers is composed of approximately same components; corresponding antennae of each group of receivers receive the same echo to form an interference signal, distinguish the generated phase difference and output the processing result to a digital phase processing module; and the processed multiple channel signals are transmitted in a signal transmitting mode that the transmitters transmit the co-prime wavelength / frequency, and direction angle deblurring is realized based on the inference theory, thus, the high-precision direction angle is obtained.

The invention belongs to the technical field of microwave communication, and particularly relates to an E-plane waveguide directional coupler and a 16-way waveguide power divider applying the coupler. The coupler comprises a first rectangular waveguide and a second rectangular waveguide which are constructed by E-plane coupling; and a ladder-shaped section for realizing a broadband phase supplementation function is arranged on the second rectangular waveguide, so that the low-amplitude volatility of each output port of a power divider with a high power division rate can be ensured. The 16-way waveguide power divider applying the coupler comprises two groups of waveguide E-plane power dividers, wherein a first E-plane waveguide directional coupler is arranged between the last-stage E-T branch waveguide of the first waveguide E-plane power divider and the previous three stages of power dividing networks, and a second E-plane waveguide directional coupler is arranged between two groups of waveguide E-plane power dividers, so that the amplitude uniformity and phase uniformity of the 16-way power divider can be effectively improved, the problem of large amplitude fluctuation of the power divider with a large power division rate can be synchronously solved, and a broadband designing requirement can be realized.

The invention provides an alternating-current drive inverter parallel control system and method. Control units in an original stand-alone system are classified into two main control parts: a main control unit and parallel module control units. The main control unit is mainly used for realizing the calculation and control functions of the whole system; and the parallel module control units are usedfor realizing collection and uploading of power module information and driving power unit and basic hardware fault protection. The main control unit and the parallel power module control units carryout power module data uploading and driving control signal issuing by an added parallel communication loop. According to the method provided by the invention, all parallel module control units use carrier synchronization signals to realize carrier wave and control signal synchronization; and all parallel modules adjust transmitting wave comparison values in real time by ring current values to realize ring current suppression. With the method provided by the invention, erection of the modularized inverter parallel system and effective ring current suppression are realized; and the alternating-current drive inverter parallel control method is an alternating-current driving system inverter parallel connection method having the broad application prospects.

The invention discloses a novel digital double-input three-path Doherty power amplifier device, comprising a power divider and a second peak power amplifier, wherein the power divider is used to divide a first input signal into two equal power or unequal power, and one signal output end of the power divider is connected with the signal input end of a carrier power amplifier through a first phase compensation line or in a direct mode to form a power amplifier branch; one signal output end of the power divider is connected with the signal input end of a first peak power amplifier through a second phase compensation line or in a direct mode, and the signal output end of the peak power amplifier is connected with a first impedance compensation line to form a power amplifier branch; the second peak power amplifier receives a second input signal, and the signal output end of the second peak power amplifier is connected with a second impedance compensation line to form a power amplifier branch; and the three power amplifier branches are serially connected with a load impedance conversion circuit after parallel connection, wherein the phase and amplitude of two input signals can be adjusted. Compared with a traditional asymmetrical two-path Doherty power amplifier, the problem of efficiency recession in output power back-off intervals can be improved, and thus the average efficiency of the power amplifier can be greatly increased.

The invention belongs to the technical field of communication, and relates to a large-scale MIMO antenna comprising a reflection plate, a calibration network arranged on one side of the reflection plate and N*M antenna subarrays arranged on the side of the reflection plate away from the calibration network, wherein N is a positive integer greater than or equal to 1 and M is a positive integer greater than or equal to 2. The antenna subarrays comprises a power dividing plate and a radiation unit arranged on the power dividing plate. The power dividing plate has a microstrip line structure. Thecalibration network has a microstrip line structure or a strip-line structure. The thickness of the reflection plate is 1.5mm-3mm. The antenna subarrays are connected with the calibration network through a probe. The antenna subarrays and the calibration network are respectively connected with the reflection plate through metal screws, and at least one metal screw is arranged around the probe. Theantenna subarrays, the calibration network and the reflection plate are modularized so that detection, maintenance or replacement of a single module can be facilitated; besides, at least one metal screw is directly grounded around the feeding probe so that the antenna signal transmission is good.

The invention belongs to the technical field of microwave communication, and particularly relates to a 32-channel waveguide E-plane power divider. The 32-channel waveguide E-plane power divider comprises two groups of 16-channel sub-power dividers which are in left and right mirror distribution, wherein each 16-channel sub-power divider comprises a first waveguide E-plane power divider and a second waveguide E-plane power divider; each first waveguide E-plane power divider is provided with a first E-plane waveguide directional coupler; a second E-plane waveguide directional coupler is arranged between each first waveguide E-plane power divider and the corresponding second waveguide E-plane power divider; a third E-plane waveguide directional coupler is connected with each first E-plane waveguide directional coupler and the corresponding second E-plane waveguide directional coupler; each E-plane waveguide directional coupler comprises a first rectangular waveguide and a second rectangular waveguide of an E-plane coupling structure; and each second rectangular waveguide is provided with a ladder stage for achieving a broadband phase compensation function. The 32-channel waveguide E-plane power divider has the advantages of a high broadband, a high power dividing ratio, a small amplitude fluctuation and good phase consistency; and the amplitude consistency and the phase consistency of an existing 32-channel power divider can be effectively improved.

The invention discloses a radio-frequency cable assembly phase consistency assembling method. The radio-frequency cable assembly phase consistency assembling method comprises the following steps: (1)assembling a first radio-frequency cable assembly, adopting the first radio-frequency cable assembly as a reference, and performing the test by using a vector network analyzer; (2) producing a secondradio-frequency cable assembly, and assembling one end of the second radio-frequency cable assembly and the first radio-frequency cable assembly by virtue of a connector; (3) performing the single-channel test by virtue of the vector network analyzer, comparing with the first radio-frequency cable assembly, and obtaining a phase difference; (4) trimming the other end of the second radio-frequencycable assembly, wherein the trimming coefficient is D; (5) calculating a trimming length Cmm, wherein C is equal to D multiplied by the phase difference; and (6) repeating the steps (2) to (5), and completing the assembling, test, calculation and trimming of other radio-frequency cable assemblies. According to the radio-frequency cable assembly phase consistency assembling method, by combining thecurrent processing and test technology of the radio-frequency cable assembly, the phase consistency of assemblies can be effectively ensured, the qualification rate of the phase consistency match iskept at more than 80 percent, and the mass production can be facilitated.

The invention discloses a transmitting base station with a water-cooling monitoring device. The transmitting base station comprises a wireless signal transmitting system, a microwave optical fiber transmission device, a water-cooling device and the water-cooling monitoring device, the microwave optical fiber transmission device is used for communication between the main base station and the plurality of sub base stations; the water cooling devices are respectively arranged in the wireless signal transmitting systems; the water cooling monitoring device comprises a main controller unit, a communication unit, a phase sequence protector, a switching power supply, an analog quantity input module and a sensor. According to the invention, the water cooling device is adopted to dissipate heat ofthe high heating element, and the water cooling monitoring device realizes control of key equipment of the water cooling device and process processing of various alarm signals according to control requirements; phase discrimination and amplitude monitoring are directly carried out on reference signals returned by the sub-stations, absolute full phase compensation of optical links of the sub-stations is not needed, only relative compensation among the sub-stations needs to be carried out, and the phase consistency among the sub-stations is guaranteed.

The invention relates to the technical field of heat dissipation for satellite-borne phased array equipment, and discloses a method for integrating and mounting satellite-borne TR assembly arrays withhigh heat flux density. The method includes procedures of clamping a high-speed uniform-temperature heat conduction heat pipe between every two TR assemblies, leading out the corresponding TR assemblies at two ends of each heat pipe and forming independent TR assembly modules; arranging U-shaped left hoops and U-shaped right hoops for integrating and mounting the independent TR assembly modules;integrating the corresponding N independent TR assembly modules by each left hoop and the corresponding right hoop. The N is a natural number larger than 1. The technical method has the advantages that TR assembly array integrated heat dissipation systems are used in satellite-borne platforms by the aid of the method for the first time; the problems of internal volume and weight restriction and the like of satellite-borne phased array antennas can be solved by the aid of the method; integral satellite-borne phased array antennas have the total heat dissipation capability of 200 W under the condition that temperature intervals ranging from 35 DEG C to 55 DEG C are provided on heat sink surfaces, the temperatures are not higher than 85 DEG C all along after heating chips in the TR assembliesare in stable states, and accordingly the phase congruency of phase units can be guaranteed.

The invention discloses a Ka frequency band standardized four-channel transmitting assembly. The assembly comprises a power supply part and a radio-frequency signal modulation part, a data bit and a power supply modulation circuit are used for power supply control, an external chip selection signal is combined, and independent and controllable single channel is realized; meanwhile, a phase-shift attenuation multifunctional chip is used as an amplitude-phase control device; smooth transmission of various functions of the transmitting module is ensured, the anti-interference capability and the negative electricity protection function of the product are both considered, the overall internal transmission network is globally optimized, standardized design of the module size is realized, the production cost is low, and a radar array plane can be formed by regular splicing, arrangement and combination.

This invention relates to a calibration network of an intelligent antenna including a metal plate opened with multi-set of couple windows, transmission lines above the metal plate corresponding to thecouple windows, transmission lines below the metal plate and a power distributor circuit, the transmission lines above or below the plate and the corresponding windows make up of a coupler, all the branches of the power distributor are connected with the transmission lines under the metal plate, which can guarantee the consistency of the amplitudes and phases from the calibration port to the antenna port.

The invention relates to a spline tension positioning device for gear machining and detection and an installation method thereof. The spline tension positioning device includes a mandrel, a supportingplate, a spline tensioning sleeve, a set nut and a compression nut; central positioning holes are formed in the upper end and the lower end of the mandrel, and the mandrel is provided with an upper threaded segment, a middle threaded segment and a lower threaded segment, a positioning conical surface is arranged in the position, located between the middle threaded segment and the lower thread segment, on the mandrel, and symmetrical flat milling surfaces are arranged at the lower end of the mandrel; spline tooth shapes are arranged outside the spline tensioning sleeve, and an internal hole ofthe spline tensioning sleeve is a conical hole; a threaded hole is formed in the center of the supporting plate; the supporting plate is connected with the lower threaded segment of the mandrel, andthe spline tensioning sleeve and the mandrel are coaxially connected through the matching of the conical hole and the positioning cone surface in a sleeving mode; and the set nut is connected with themiddle threaded segment of the mandrel, and the lower end of the compression nut is pressed on the upper end of the spline tensioning sleeve, so that a plurality of gear workpieces form tension contact with the spline tensioning sleeve, and the compression nut is connected with the upper threaded segment of the mandrel, so that the multiple gear workpieces are clamped and fixed between the supporting plate and the compression nut. According to the spline tension positioning device for gear machining and detection and the installation method thereof, the phase consistency requirement of innerteeth and outer teeth of gears used in pairs or sets is ensured.

The invention relates to a power amplifier with an electrostatic discharge protection circuit. A core circuit uses a NMOS (N-channel metal oxide semiconductor) tube stacking structure; source electrodes and drain electrodes of three NMOS tubes are sequentially connected. Each NMOS tube is in bias arrangement in AB type; tandem resistors form a bias circuit. The electrostatic discharge protection circuit uses a distributed electrostatic discharge protection structure; the schematic diagram is shown as Figure 1; a diode in the protection circuit uses a PN junction diode; each electrostatic discharge protection unit uses the same diode; the diodes in parallel connection are connected through CPW (coplanar waveguide); the electrostatic discharge protection degrade of the core radio frequency power amplifier can be effectively improved; the parasitic effect of the protection circuit is weakened; the power amplifier is applicable to high work frequency.

The invention provides a long-distance distributed large-dynamic microwave optical fiber stable-phase transmission system which comprises a main signal light-emitting module, a reference light receiving and transmitting module, an amplitude-phase monitoring and control module, a delay compensation module, a dispersion compensation and light amplification module, a signal return module and a main signal light receiving module, wherein the amplitude-phase monitoring and control module further comprises a reference signal unit, an amplitude-phase monitoring unit and a compensation control unit; the reference signal unit adopts a variable frequency signal source; and the amplitude-phase monitoring unit directly performs phase discrimination and amplitude monitoring among the reference signalsreturned by each sub-station. According to the invention, the reference signal unit can change the frequency of the reference signal in real time, so as to obtain higher phase monitoring precision; the amplitude-phase monitoring unit directly carries out phase discrimination and amplitude monitoring on the reference signals returned by the sub-stations, only relative compensation between the sub-stations needs to be carried out, the compensation range requirement of the delay compensation module is lowered, and meanwhile the complexity degree and cost requirement of the system are lowered.

The invention discloses a high-frequency eccentric vibration acoustic wave power head for a drilling machine, and belongs to the field of audio frequency drilling machines. The high-frequency eccentric vibration acoustic wave power head for the drilling machine comprises a main frame, a spindle rotating mechanism, a spindle vibrating mechanism and a bearing cooling lubricating system. Structurally, a spindle and a spindle hydraulic motor adopt spline structures for transmission connection, the spindle is rotationally connected into a spindle box, the spindle box is mounted in the main frame inthe mode of hanging in air through a vibration isolator, high-frequency vibration is generated through two sets of eccentric vibration mechanisms in the spindle box, thus the acoustic wave power headis more compact and more reasonable in structure, and spindle rotation and axial vibration movement are more stable and more reliable; and meanwhile a vibrator shaft bearing is cooled and lubricatedby lubricating oil through a lubricating oil circulation control system, the working temperature of the vibrator shaft bearing is greatly decreased, the service life of the bearing is prolonged, thusthe eccentric-vibration-type acoustic wave power head can work at a higher vibration frequency, and the working efficiency of the acoustic wave power head is further improved.

The invention relates to a high-precision active power splitting assembly. The active power splitting assembly comprises a radio frequency amplification power splitting circuit, a coupling detection circuit and a DC-DC conversion circuit, wherein the radio frequency input end of the radio frequency amplification power splitting circuit is connected with a radio frequency input signal, and the output end of the radio frequency amplification power splitting circuit outputs a radio frequency signal, and is connected with the input end of the coupling detection circuit; the output end of the coupling detection circuit outputs a fault detection alarm signal; the output end of theDC-DC conversion circuit is connected with the radio frequency amplification splittingcircuit and the coupling detection circuit; the input end of the DC-DC conversion circuit isan external power supply port of the assembly. According to the invention, the sizeof the assemblyis greatly reduced, the standing wave ratio, harmonic suppression ratio, clutter suppression ratio, in-band fluctuation and isolation index of each output port of the whole assemblyare effectively improved, the amplitude and phase consistency and stability of output signals are ensured, and meanwhile, the anti-total reflection performance of each output port of the assemblyis improved.

The invention discloses a method for keeping a consistent phase of a frequency division clock and a frequency division circuit. The method comprises the following steps: communicating a D input end of the last stage register of a first frequency divider with the D input end of the last stage register of a second frequency divider, wherein the first frequency divider is located at the outside of a curing module, and the second frequency divider is located in the curing module; performing frequency division on a source clock signal through the first frequency divider and the second frequency divider, outputting a first frequency division signal from a Q output end of the last stage register of the first frequency divider, and outputting a second frequency division signal from the Q output end of the last stage register of the second frequency divider, wherein the phase of the first frequency division signal is consistent with the phase of the second frequency division signal.

The invention belongs to the technical field of microwave communication, and in particular relates to a 32-way waveguide E-plane power divider. The present invention includes two sets of sixteen-way sub-power splitters distributed in left and right mirror images; each sixteen-way sub-power splitter includes a first waveguide E-plane power splitter and a second waveguide E-plane power splitter; the first waveguide E-plane power splitter The first E-plane waveguide directional coupler is set at the power divider, and the second E-plane waveguide directional coupler is set between the first waveguide E-plane power divider and the second waveguide E-plane power divider; the third E-plane waveguide directional coupler Connect the first E-plane waveguide directional coupler and the second E-plane waveguide directional coupler; each E-plane waveguide directional coupler includes a first rectangular waveguide and a second rectangular waveguide with an E-plane coupling structure, and the second rectangular waveguide is provided with It is used to realize the step section of broadband phase compensation function. The invention has the advantages of high broadband, high power split ratio, small amplitude fluctuation and good phase consistency, and can effectively improve the amplitude consistency and phase consistency of the current 32-way power splitter.

The invention discloses a transmitting base station with a water cooling monitoring device, comprising a wireless signal transmitting system, a microwave optical fiber transmission device, a water cooling device and a water cooling monitoring device; the microwave optical fiber transmission device is used for communication between the main base station and multiple sub-base stations The water-cooling devices are respectively set in the wireless signal transmission system; the water-cooling monitoring device includes a main controller unit, a communication unit, a phase sequence protector, a switching power supply, an analog input module and a sensor. The present invention uses a water-cooling device to dissipate heat from high-heating components, and the water-cooling monitoring device realizes the control of the key equipment of the water-cooling device and the process processing of various alarm signals according to the control requirements; Phase detection and amplitude monitoring do not require absolute full phase compensation of the optical link of each sub-site, but only relative compensation between sub-sites, ensuring the phase consistency between sub-sites.

The invention relates to a pulse phase stabilization method and a device. The method comprises the following steps: S1, obtaining continuous light as signal light; S2, carrying out polarization state modulation and power control on the signal light and pulse light to be processed and inputting the signal light and the pulse light into respective and optical fiber to carry out cross polarization modulation; S3, filtering the output light after being subjected to the cross polarization modulation to filter the pulse light; S4, carrying out polarization state adjustment and intensity conversion to the filtered signal light to obtain a wavelength conversion light signal, thereby outputting a pulse signal. By adopting the technical scheme, the cross polarization modulation effect and the wavelength conversion principle are utilized for completely removing the phase information of the original pulse, so that the phase consistence of output pulses is ensured, thereby greatly improving the performance of the whole system. Meanwhile, a high nonlinear light crystal is utilized as a cross polarization modulation medium to meet the phase modulation requirements of an ultra-short pulse laser.

The invention discloses an automatic test device and a test method for a multi-beam assembly. The device comprises an input radio frequency distribution module and an output radio frequency distribution module. The input radio frequency distribution module and the output radio frequency distribution module are provided with a radio frequency connector connected with a test instrument and a control interface connected with a control host outside, and a radio frequency signal distribution circuit for dividing a radio frequency signal into multiple parts is arranged in the input radio frequency distribution module; the output radio frequency distribution module comprises a radio frequency signal synthesis circuit for combining multiple radio frequency signals into one inside, and each branch of the radio frequency signal distribution circuit and the radio frequency signal synthesis circuit is provided with a control switch. The automatic test device for the multi-beam assembly, provided by the invention, is low in cost, small in size and easy to use, can realize synchronous control of the test instrument, the radio frequency distribution module and the tested assembly, and can complete performance tests of all channels through one-time installation and one key.

The invention provides an alternating-current drive inverter parallel control system and method. Control units in an original stand-alone system are classified into two main control parts: a main control unit and parallel module control units. The main control unit is mainly used for realizing the calculation and control functions of the whole system; and the parallel module control units are usedfor realizing collection and uploading of power module information and driving power unit and basic hardware fault protection. The main control unit and the parallel power module control units carryout power module data uploading and driving control signal issuing by an added parallel communication loop. According to the method provided by the invention, all parallel module control units use carrier synchronization signals to realize carrier wave and control signal synchronization; and all parallel modules adjust transmitting wave comparison values in real time by ring current values to realize ring current suppression. With the method provided by the invention, erection of the modularized inverter parallel system and effective ring current suppression are realized; and the alternating-current drive inverter parallel control method is an alternating-current driving system inverter parallel connection method having the broad application prospects.

The invention provides an extensible microphone array and an establishment method thereof. A synchronous sampling mechanism between chips is adopted, and adc synchronous sampling of the chips is controlled through a gpio, so that a phase difference of multi-channel adc data is ensured to be within 1 microsecond, and synchronous operation of the chips is guaranteed; each chip independently completes noise reduction, echo cancellation or a beam forming algorithm of the double microphones, so that the system overhead can be effectively dispersed, and the load of the whole system is reduced; audiodata processed by a single slave chip is cascaded and transmitted to a main chip to complete algorithm processing of the microphone array, the system is expanded to any number of microphone arrays through cascading, and meanwhile, the chips form the microphone array, so that compared with a single-chip multi-adc scheme, the cost is lower and the expansibility is more flexible.