CN109709545A - A kind of multichannel high-resolution through-wall radar imaging system based on embedded architecture - Google Patents
A kind of multichannel high-resolution through-wall radar imaging system based on embedded architecture Download PDFInfo
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Abstract
The multichannel high-resolution through-wall radar imaging system based on embedded architecture that the present invention provides a kind of, the high resolution target imaging research acquired for multiple target multi-channel information under external field environment, pretreatment imaging data amount is increased by multi-channel data acquisition module and reduces global error, and the Cortex-M4 kernel under ARM framework is recycled to carry out data processing and high resolution target imaging.By the present invention in that using general processor STM32-F4 kernel as operation carrier, combine the Cortex-M4 kernel based on ARM framework and carries out data processing, the signal processing system based on ARM hardware structure is obtained, it is final to realize the through-wall radar imaging system that there is multichannel, high-resolution, high-speed data to handle transimission and storage function.
Description
Technical field
The present invention relates to through-wall radar imaging processing technology field, especially a kind of multichannel based on embedded architecture is high
Differentiate through-wall radar imaging system.
Background technique
A kind of document " Parallel Implementation [J] Guilin Electronic Science and Technology Univ. of the through-wall radar imaging algorithm based on multi-core DSP
Journal, 2018,38 (05): 345-350 " discloses a kind of Parallel Implementation side of through-wall radar imaging algorithm based on multi-core DSP
Method.The characteristics of this method is according to ULTRA-WIDEBAND RADAR BP imaging algorithm, selects the task framework of master slave mode to carry out task rule to it
It draws, realizes that synchronous communication and task between 8 cores are handled using intercore communication mechanism (IPC), and design Ethernet coffret
Realize the quick intercommunication of data of DSP and the end PC.Under the premise of guaranteeing image quality, the real-time that imaging is realized is improved.
Document the method handles in DSP and uses Ethernet coffret between core and the end PC, in bottom serial communication
Be not suitable for carrying out quick information transmitting and data transit working；In addition, target detection source port used in this method lacks
To the function of multiple target sounding processing, the monitoring information in simple target channel, therefore information content obtained can only be provided
It is limited, cause imaging effect of the echo-signal through walls in terminal processing system poor.
Summary of the invention
For overcome the deficiencies in the prior art, in order to improve the resolution ratio of through-wall radar imaging, the present invention provides a kind of base
In the multichannel high-resolution through-wall radar imaging system of embedded architecture, mainly for multiple target multi-channel information under external field environment
The high resolution target imaging research of acquisition increases pretreatment imaging data amount by multi-channel data acquisition module and reduces whole
Body error recycles the Cortex-M4 kernel under ARM framework to carry out data processing and high resolution target imaging.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of multichannel high-resolution through-wall radar imaging system based on embedded architecture, including RF front-end module, number
According to acquisition module, data processing module, central processing module, image-forming module and power module；Before power module is respectively radio frequency
End module, data acquisition module, data processing module, image-forming module and central processing module power supply；RF front-end module generates
And higher-frequency radar signal is received as processing information source；Data acquisition module receives serial port communication data, i.e., the described processing information
Source, and carry out data frame check and contents extraction to received serial port communication data, data acquisition module is by the data after acquisition
It send to data processing module, data processing module carries out imaging algorithm processing and mesh to the data information that data acquisition module transmits
Mark information fusion；Image-forming module carries out imaging to the processing data information that data processing module generates and shows；Central processing module
For the main control unit of system, between data acquisition module and central processing module, data processing module and central processing module into
Row data communication control.
The RF front-end module includes that transmitting receiving antenna, radio-frequency pulse module and echo rs 232 serial interface signal export mould
Block, radio-frequency pulse module generate 24GHz high-frequency impulse, and high-frequency impulse is emitted to space and receives mesh by transmitting receiving antenna
The echo-signal of object reflection is marked, obtained echo data is processed into and is used for serial communication by echo rs 232 serial interface signal output module
Data frame signal, and be sent in data receiver object.
The central processing module includes STM32-F4 kernel, eeprom memory, inside FLASH and clock module,
Clock module provides working signal for STM32-F4 kernel, and eeprom memory collects for storing instruction and bottom firmware library letter
Number, the I/O port that internal FLASH is used to store STM32-F4 kernel is data cached, and STM32-F4 kernel sends enabling signal, utilizes
The enabling signal carries out logic control to RF front-end module, data acquisition module and data processing module, and then before making radio frequency
End module emits 24GHz higher frequency probe signals, and data acquisition module is acquired serial port communication data, and by received echo
Signal is converted into Transistor-Transistor Logic level and transmits for serial communication, carries out data processing module to the acquisition data of data acquisition module
Data processing.
The data acquisition module includes serial ports converting interface module and outside FLASH module, when data acquisition module connects
When receiving the enabling signal of STM32-F4 kernel transmission, radio-frequency front-end is transmitted the RS-232 signal of coming in by serial ports converting interface module
It is transformed into the level information that data processing module can identify, then the serial data that will be obtained, i.e., the described level information carries out frame
The valid data position information in data frame is verified and extracted, that is, is rejected remaining after lead code and the tail portion check code in a frame data
Intermediate data, by data information transfer errorless after obtained verification into pre-set data storage area, data storage
Area is Nonvolatile memory, i.e., the described external FLASH module, after completing to data storage operations in external FLASH module,
Serial ports converting interface module sends response signal to STM32-F4 kernel.
The data processing module includes that Cortex-M4 processing core module, imaging algorithm processing module group, multiple target are whole
Processing module and SDRAM memory module are closed, when data processing module receives the enabling signal of STM32-F4 kernel transmission, from
Multichannel preprocessed data is read in pre-set external FLASH module, imaging algorithm is passed through to multichannel preprocessed data
Processing module group carries out multi channel imaging information processing, gets the corresponding multiple groups primary data of multichannel preprocessed data；It will
Multiple groups primary data is integrated using multiple-target integration processing module, the overall goals data that obtain that treated；By whole mesh
Mark data are stored into SDRAM memory module, after completing to data storage operations in SDRAM memory module, then to
STM32-F4 kernel sends response signal.
The image-forming module includes LTDC control module and LCD-TFT panel, and LTDC control module uses residue SDRAM
Memory module as video memory, directly control LCD-TFT panel for be imaged display.
The power module includes USB power source power supply port and 220V rectification decompression power supply port, and 5V power supply and USB power source supply
Power port is connected, and makes 5V voltage by USB power supply port, thus the burning voltage needed for obtaining in USB power supply port output end；220V is whole
Stream decompression power supply port converts 220V to by way of decompression stable direct current 5V power supply, and 5V voltage is made to pass through different power consumption moulds
Block realizes stable power supply supply.
The beneficial effects of the invention are as follows, as operation carrier, combined and be based on by using general processor STM32-F4 kernel
The Cortex-M4 kernel of ARM framework carries out data processing, obtains the signal processing system based on ARM hardware structure, final to realize
The through-wall radar imaging system of transimission and storage function is handled with multichannel, high-resolution, high-speed data.
Detailed description of the invention
Fig. 1 is a kind of structural representation of the multichannel high-resolution through-wall radar imaging system based on embedded architecture of the present invention
Figure.
Fig. 2 is the structural schematic diagram of RF front-end module of the present invention.
Fig. 3 is the instruction flow chart of data acquisition module of the present invention and data processing module.
Fig. 4 is the structural schematic diagram of data acquisition module of the present invention.
Fig. 5 is the structural schematic diagram of data processing module of the present invention.
Fig. 6 is the structural schematic diagram of central processing module of the present invention.
Fig. 7 is the structural schematic diagram of image-forming module of the present invention.
Fig. 8 is the structural schematic diagram of power module of the present invention.
Fig. 9 is a kind of structural upright of the multichannel high-resolution through-wall radar imaging system based on embedded architecture of the present invention
Figure.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
A kind of multichannel high-resolution through-wall radar imaging system based on embedded architecture, including RF front-end module, number
According to acquisition module, data processing module, central processing module, image-forming module and power module；Before power module is respectively radio frequency
End module, data acquisition module, data processing module, image-forming module and central processing module power supply；RF front-end module generates
And higher-frequency radar signal is received as processing information source；Data acquisition module receives serial port communication data, i.e., the described processing information
Source, and carry out data frame check and contents extraction to received serial port communication data, data acquisition module is by the data after acquisition
It send to data processing module, data processing module carries out imaging algorithm processing and mesh to the data information that data acquisition module transmits
Mark information fusion；Image-forming module carries out imaging to the processing data information that data processing module generates and shows；Central processing module
For the main control unit of system, between data acquisition module and central processing module, data processing module and central processing module into
Row data communication control.
The RF front-end module includes that transmitting receiving antenna, radio-frequency pulse module and echo rs 232 serial interface signal export mould
Block, radio-frequency pulse module generate 24GHz high-frequency impulse, and high-frequency impulse is emitted to space and receives mesh by transmitting receiving antenna
The echo-signal of object reflection is marked, obtained echo data is processed into and is used for serial communication by echo rs 232 serial interface signal output module
Data frame signal, and be sent in data receiver object.
The central processing module includes STM32-F4 kernel, eeprom memory, inside FLASH and clock module,
Clock module provides working signal for STM32-F4 kernel, and eeprom memory collects for storing instruction and bottom firmware library letter
Number, the I/O port that internal FLASH is used to store STM32-F4 kernel is data cached, and STM32-F4 kernel sends enabling signal, utilizes
The enabling signal carries out logic control to RF front-end module, data acquisition module and data processing module, and then before making radio frequency
End module emits 24GHz higher frequency probe signals, and data acquisition module is acquired serial port communication data, and by received echo
Signal is converted into Transistor-Transistor Logic level and transmits for serial communication, carries out data processing module to the acquisition data of data acquisition module
Data processing.
The data acquisition module includes serial ports converting interface module and outside FLASH module, when data acquisition module connects
When receiving the enabling signal of STM32-F4 kernel transmission, radio-frequency front-end is transmitted the RS-232 signal of coming in by serial ports converting interface module
It is transformed into the level information that data processing module can identify, then the serial data that will be obtained, i.e., the described level information carries out frame
The valid data position information in data frame is verified and extracted, that is, is rejected remaining after lead code and the tail portion check code in a frame data
Intermediate data, by data information transfer errorless after obtained verification into pre-set data storage area, data storage
Area is Nonvolatile memory, i.e., the described external FLASH module, after completing to data storage operations in external FLASH module,
Serial ports converting interface module sends response signal to STM32-F4 kernel.
The data processing module includes that Cortex-M4 processing core module, imaging algorithm processing module group, multiple target are whole
Processing module and SDRAM memory module are closed, when data processing module receives the enabling signal of STM32-F4 kernel transmission, from
Multichannel preprocessed data is read in pre-set external FLASH module, imaging algorithm is passed through to multichannel preprocessed data
Processing module group carries out multi channel imaging information processing, gets the corresponding multiple groups primary data of multichannel preprocessed data；It will
Multiple groups primary data is integrated using multiple-target integration processing module, the overall goals data that obtain that treated；By whole mesh
Mark data are stored into SDRAM memory module, after completing to data storage operations in SDRAM memory module, then to
STM32-F4 kernel sends response signal.
The image-forming module includes LTDC control module and LCD-TFT panel, and LTDC control module uses residue SDRAM
Memory module as video memory, directly control LCD-TFT panel for be imaged display.
The power module includes USB power source power supply port and 220V rectification decompression power supply port, and 5V power supply and USB power source supply
Power port is connected, and makes 5V voltage by USB power supply port, thus the burning voltage needed for obtaining in USB power supply port output end；220V is whole
Stream decompression power supply port converts 220V to by way of decompression stable direct current 5V power supply, and 5V voltage is made to pass through different power consumption moulds
Block realizes stable power supply supply.
The composition for showing a kind of multichannel high-resolution through-wall radar imaging system based on embedded architecture referring to Fig.1 shows
It is intended to, using the RF front-end module of Fig. 2 as signal source, using the central processing module of Fig. 6 as system control unit, with Fig. 4's
Hardware realization platform of the image-forming module of data acquisition module, the data processing module of Fig. 5 and Fig. 7 as system, with the electricity of Fig. 8
Source module is powered support to whole system, the common data processing work completed to the signal data of input system.
Referring to Fig. 2, the medium that RF front-end module is transmitted using transmitting receiving antenna as information source in space, RF pulse-to-pulse
Die block generates the K-band electromagnetic wave of high frequency 24GHz by internal logic structure circuit, which passes through transmitting day
Line is propagated into space, receives reflection echo using receiving antenna, and the echo digital signal received is transmitted to back
Digital signal is converted to the frame data structure suitable for serial communication by wave rs 232 serial interface signal output module.
Referring to Fig. 3, the instruction flow of data acquisition module and data processing module is as follows:
STM32-F4 kernel sends enabling signal, which is first transferred in data acquisition module, works as data
After acquisition module receives the enabling signal, start to carry out data collection task.
Data acquisition module reads serial data frame information from echo rs 232 serial interface signal output module, and is transferred by serial ports
Mouth mold block carries out format conversion to data frame information, thus the data frame information under obtaining Transistor-Transistor Logic level.
The data frame information received is verified, these check informations are that data acquisition module can work normally
It ensures, setting of the STM32-F4 kernel according to the complete paired data acquisition module of these parameter informations.
The correct data received is subjected to number of significant digit according to contents extraction, and the valid data that obtained verification is errorless
Position information is stored to external FLASH module, and serial ports converting interface module sends response signal to STM32-F4 kernel, STM32- at this time
After F4 kernel receives response signal, the enabling signal for corresponding to data processing module is sent.The enabling signal is for opening number
According to the signal that processing module works, when central processing module completes parameter information with postponing, expression can carry out at data at this time
Manage the task of module.
After data processing module receives enabling signal, location data ginseng is read from the external FLASH module
Number, parameter is sent into imaging algorithm processing module group and multiple-target integration processing module, carries out multiple targets fusion and imaging is calculated
Method handles and obtains overall goals data.
The overall goals data are stored to SDRAM memory module, and send response signal to STM32-F4 kernel, it is complete
At data processing function, and obtain that required multi-channel information synchronization data are imaged.
Data acquisition module is in the STM32-F4 kernel for receiving central processing module it can be seen from above-mentioned technical proposal
After the enabling signal of transmission, serial data frame information, and the number that parsing is obtained are read from echo rs 232 serial interface signal output module
It stores according to frame information into external FLASH module；Data acquisition module sends response signal to STM32-F4 kernel, and by
STM32-F4 kernel, which sends enabling signal, makes data processing module work, and reads the data in external FLASH module, completes
Imaging and Multichannel fusion, after overall goals data are stored to SDRAM memory module, data processing module is to centre
The STM32-F4 kernel for managing module sends response message.The configuration-direct of the data acquisition module and data processing module is right simultaneously
Multiple groups target data carries out parallel processing, improves the efficiency of multi-channel information processing.
Referring to Fig. 4 and Fig. 5, data acquisition module and data processing module are core of the invention processing unit, the number
It include serial ports converting interface module and outside FLASH module according to acquisition module, the data processing module includes including Cortex-M4
Handle core module, imaging algorithm processing module group, multiple-target integration processing module and SDRAM memory module.
The design considerations of the serial ports converting interface module is Transistor-Transistor Logic level used in circuit and RS232 level, TTL electricity
Put down for inside modules signal transmitting, RS232 level for intermodule signal transmit, using serial ports converting interface module as
Level conversion controller realizes the signal transmitting of intermodule, i.e., the described echo rs 232 serial interface signal output module and serial ports switching mouth mold
Data frame transmitting between block, while frame check and number of significant digit are carried out according to extraction to data are received, and then obtain effective echo
Location information data.
The external FLASH module is used to store the valid data position letter in the data frame that serial ports converting interface module receives
Breath, and wait the reading and calling of the Cortex-M4 processing core module progress information.
The Cortex-M4 processing core module is the core of data processing module, and Cortex-M4 handles core module to described
External FLASH module carries out data call, and the information of acquisition is sent to imaging algorithm processing module group and multiple-target integration processing
Module carries out data processing operation.
The imaging algorithm processing module group includes quantitative imaging algorithm processing module, an imaging algorithm processing module
Corresponding one group of target data carries out algorithm process, and Multi-target Data carries out algorithm process in multiple imaging algorithm processing modules,
To obtain multiple groups target process outcome.
The multiple-target integration processing module integrates the multi-group data that the imaging algorithm processing module group obtains,
To obtain the multiple-object information location data under multichannel, i.e. the High Accuracy and High Resolution orientation imaging results of multipoint targets.
The SDRAM memory module, for all target datas to be carried out storage operation, when completion is to all target datas
Storage processing after, i.e., data acquisition module and data processing module to echo data positioning imaging processing work.
Single goal or multiple target are obtained from serial ports converting interface module from can be seen that data acquisition module in technical solution
Data frame information, and significance bit information is extracted in the module, and then obtain effective echo-bearing information, by institute
The positioning single goal or multiple-object information of acquisition are stored in external FLASH module；The Cortex-M4 of data processing module is handled
Core module is called the external FLASH module, reads datum target information, and one or more groups of data are sent to imaging
It is handled in algorithm processing module group, obtained processing data is sent again to multiple-target integration processing module progress multiple target and are melted
Close work；Data after resulting processing are finally stored to the calling that image-forming module is waited to SDRAM memory module.
Referring to Fig. 6, STM32-F4 kernel is the main control unit of central processing module, carries out the control of system data and leads to
Letter, processing system receive the radar return data transmitted from front end, are carried out by data acquisition module to initial data frame signal
Obtained significance bit data call to data processing module is carried out algorithm process and targeted integration by acquisition.After the completion of processing
Data can be called by image-forming module, complete the liquid crystal imaging display function of acquisition data.
Wherein, clock module is for providing the working signal of STM32-F4 kernel, and eeprom memory is for storing instruction
Collection and bottom firmware library function, the I/O port that internal FLASH is used to store STM32-F4 kernel are data cached.
Referring to Fig. 7, LTDC control module mainly includes control signal wire, image processing unit, configuration register.LTDC's
The data line of control signal wire and liquid crystal display panel corresponds, and includes HSYNC, VSYNC, DE, CLK and RGB data line
Totally 8.Liquid crystal display panel and STM32 corresponding pin are attached when designing circuit connection, pin configuration will draw with actual circuit
Foot interface matches；Image processing unit obtains the data in the SDRAM memory module by AHB interface, then data
It is sent to two layers of FIFO caching, every layer of FIFO can cache 64x32 data；Data, which are obtained, from FIFO caching again gives PFC
Pixel format converter, data from pixel format conversion at the format of word；Two layer datas are merged using mixed cell
Come, LCD-TFT panel is output to by signal wire；Configuration register contains various configurations and the status register of LTDC,
LTDC control module, according to output, data is carried using AHB interface to liquid according to these configuration control numbers from SDRAM memory module
Crystal panel.
Referring to Fig. 8, the power module of system is mainly made of USB power source power supply port and 220V rectification decompression power supply port.USB
The input terminal of power supply power supply mouth is using 5V D.C. regulated power supply as the input of power supply；220V rectification decompression power supply port is by defeated
Enter source, rectification module, Voltage stabilizing module and voltage changing module composition.Wherein, after system connects 220V alternating current, rectifying device will
220V AC voltage is rectified, and unidirectional voltage is obtained, using Voltage stabilizing module by voltage stabilization to required operating voltage
5V.By the output end connection of the power module RF front-end module, data acquisition module, data processing module, centre
Module and image-forming module are managed, to realize the normal operation of whole hardware circuit function.
Referring to Fig. 9, the multichannel high-resolution through-wall radar imaging system based on embedded architecture is by the radio-frequency front-end
Module, data acquisition module, data processing module, central processing module, image-forming module and power module carry out integrated synthesis
System.On this system, central processing module carries out logic control to other modules, and each module is made to complete corresponding function；
RF front-end module generates digital signal and is converted to the frame number suitable for serial communication using transmitting receiving antenna as information source
According to structure；Data acquisition module obtains effective echo-bearing information of single goal or multiple target from serial ports converting interface module；Number
One or more groups of data are sent into imaging algorithm processing module group according to processing module and is handled and obtains multi-objective number
According to；Resulting processing data are carried out imaging and shown by image-forming module.By between the module and the information tune of inside modules
It is transmitted with data, to effectively realize a kind of multichannel high-resolution through-wall radar imaging system based on embedded architecture.
Above to a kind of multichannel high-resolution through-wall radar imaging system based on embedded architecture provided by the present invention
It is described in detail.In specification modules using functional module divide and it is layer-by-layer it is progressive by the way of describe, each module
What is illustrated is all its specific function and the signal processing for entering and exiting the module, the parameter tune between each functional module
With very apparent with information transfering relation.
In conjunction with managing unit and step everywhere in invention, can be realized with the combination of hardware and software, in order to clearly
Illustrate the correlation of the two functionally, describes the composition and step of each functions of modules according to function in the above description
Suddenly.Professional technician is it should be appreciated that be illustrative of the invention above embodiment, and be not used as to of the invention
Constraint condition, in a certain range to above embodiment make it is appropriate change and variation all in claimed model of the invention
In enclosing.
Claims (1)
1. a kind of multichannel high-resolution through-wall radar imaging system based on embedded architecture, including RF front-end module, data
Acquisition module, data processing module, central processing module, image-forming module and power module, it is characterised in that:
The power module is respectively RF front-end module, data acquisition module, data processing module, image-forming module and centre
Manage module for power supply；RF front-end module generates and receives higher-frequency radar signal as processing information source；Data acquisition module receives
Serial port communication data, i.e., the described processing information source, and data frame check and contents extraction are carried out to received serial port communication data,
Data after acquisition are sent the number transmitted to data processing module, data processing module to data acquisition module by data acquisition module
It is believed that breath carries out imaging algorithm processing and target information fusion；The processing data information that image-forming module generates data processing module
Imaging is carried out to show；Central processing module is the main control unit of system, at data acquisition module and central processing module, data
It manages and carries out data communication control between module and central processing module；
The RF front-end module includes transmitting receiving antenna, radio-frequency pulse module and echo rs 232 serial interface signal output module, is penetrated
Frequency pulse module generates 24GHz high-frequency impulse, and high-frequency impulse is emitted to space and receives object by transmitting receiving antenna
Obtained echo data is processed into the data for being used for serial communication by the echo-signal of body reflection, echo rs 232 serial interface signal output module
Frame signal, and be sent in data receiver object；
The central processing module includes STM32-F4 kernel, eeprom memory, inside FLASH and clock module, clock
Module provides working signal for STM32-F4 kernel, and eeprom memory collects for storing instruction and bottom firmware library function, interior
The I/O port that portion FLASH is used to store STM32-F4 kernel is data cached, and STM32-F4 kernel sends enabling signal, utilizes the starting
Signal carries out logic control to RF front-end module, data acquisition module and data processing module, and then makes RF front-end module
Emit 24GHz higher frequency probe signals, data acquisition module is acquired serial port communication data, and received echo-signal is turned
It changes Transistor-Transistor Logic level into transmit for serial communication, carries out data processing module at data to the acquisition data of data acquisition module
Reason；
The data acquisition module includes serial ports converting interface module and outside FLASH module, when data acquisition module receives
When the enabling signal that STM32-F4 kernel is sent, serial ports converting interface module changes the RS-232 signal that radio-frequency front-end transmitting is come in
At the level information that data processing module can identify, then the serial data that will be obtained, i.e., the described level information carries out frame check
And extract the valid data position information in data frame, that is, reject remaining centre after lead code and the tail portion check code in a frame data
Data, by data information transfer errorless after obtained verification into pre-set data storage area, which is
Nonvolatile memory, i.e., the described external FLASH module, after completing to data storage operations in external FLASH module, serial ports
Converting interface module sends response signal to STM32-F4 kernel；
The data processing module includes Cortex-M4 processing core module, imaging algorithm processing module group, at multiple-target integration
Module and SDRAM memory module are managed, when data processing module receives the enabling signal of STM32-F4 kernel transmission, from preparatory
Multichannel preprocessed data is read in the external FLASH module of setting, and multichannel preprocessed data is handled by imaging algorithm
Module group carries out multi channel imaging information processing, gets the corresponding multiple groups primary data of multichannel preprocessed data；By multiple groups
Primary data is integrated using multiple-target integration processing module, the overall goals data that obtain that treated；By overall goals number
According to storing into SDRAM memory module, after completing to data storage operations in SDRAM memory module, then to STM32-F4
Kernel sends response signal；
The image-forming module includes LTDC control module and LCD-TFT panel, and LTDC control module is stored using residue SDRAM
Module as video memory, directly control LCD-TFT panel for be imaged display；
The power module includes that USB power source power supply port and 220V rectification are depressured power supply port, 5V power supply and USB power source power supply port
It is connected, makes 5V voltage by USB power supply port, thus the burning voltage needed for being obtained in USB power supply port output end；220V rectification drop
Pressure power supply port converts 220V to by way of decompression stable direct current 5V power supply, makes 5V voltage by different power consumption modules,
Realize stable power supply supply.
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