CN109451565A - Low-power consumption display node based on wireless identification perception platform WISP - Google Patents
Low-power consumption display node based on wireless identification perception platform WISP Download PDFInfo
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- CN109451565A CN109451565A CN201811345775.7A CN201811345775A CN109451565A CN 109451565 A CN109451565 A CN 109451565A CN 201811345775 A CN201811345775 A CN 201811345775A CN 109451565 A CN109451565 A CN 109451565A
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- 239000003990 capacitor Substances 0.000 claims description 17
- 230000005611 electricity Effects 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 8
- 230000007812 deficiency Effects 0.000 claims description 5
- 238000004146 energy storage Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims 1
- 230000006870 function Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000007726 management method Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 8
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 235000013399 edible fruits Nutrition 0.000 description 1
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- 238000005286 illumination Methods 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
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- 230000001953 sensory effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0251—Power saving arrangements in terminal devices using monitoring of local events, e.g. events related to user activity
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3433—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
- G09G3/344—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on particles moving in a fluid or in a gas, e.g. electrophoretic devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses a low-power-consumption display node based on a wireless identification perception platform WISP. The invention comprises an antenna, an impedance matching circuit, an energy collecting circuit, a voltage regulator, a modulation module, a demodulation module, a microcontroller, a sensor and an ink screen circuit in the peripheral. The functions of the energy collecting circuit and the voltage regulator are realized by an energy collecting chip BQ25570, and the chip captures radio frequency energy and is also used for generating a working power supply of the microcontroller; the ink screen circuit adopts a chip SI1016X, and controls the connection and disconnection of the ink screen power supply by controlling the SI1016X through a microcontroller. The energy capture technology is used for capturing the radio frequency energy in the environment to supply power to the node, batteries and power supply facilities are not needed, the environment is protected, the cost is reduced, and the working time of the node is prolonged.
Description
Technical field
The present invention relates to low-consumption wireless reflection communications, energy capture field, it particularly relates to the passive section of reflection communication
The design that point data is shown.
Background technique
In passive sensory network, node usually obtains energy, such as RF energy, wind energy, solar energy, shake from environment
Kinetic energy, thermal energy etc..When energy deficiency, node enters dormant state, the collecting energy from environment；When energy abundance, node
It starts to work.This process is in cycles.Wireless identification aware platform WISP (Wireless Identification
Sensing Platform) can RF energy in capturing ambient, and can the radiofrequency signal in reflection environment communicated.
WISP can support more complicated sensing and calculating task, can integrate low-power consumption sensor to collect environment number
According to the ability with perception environment.The low-power consumption sensor for being desirably integrated into WISP includes temperature, illumination, rectified voltage and side
To equal sensors.
Passive bus needs based on WISP show the data received or the collected data of sensor, this
Locate described passive to refer to no power supply.The common methods for realizing that data are shown have: setting first is that node is directly connected to outside
Standby (such as computer, plate), upload the data on external equipment and shows；Second is that pass data to active gateway node and
It is shown on gateway node；Third is that installing a display screen additional on node and directly displaying data.First two display methods is number
It is tired and cumbersome, not enough intuitively and conveniently, and hardware cost also will increase by gateway or computer connection.Therefore the present invention adopts
With the third method, low-power consumption ink screen (e-Paper) is integrated on WISP.
WISP platform introduction
WISP be it is first it is programmable have sensing and computing function without identifing source and aware platform, use super low-power consumption
Microcontroller executes perception and calculating task, while capturing less radio-frequency (RF) energy from environment and maintaining its operation.WISP is flat
The sensors such as temperature and humidity, ambient lighting, rectified voltage, direction are successfully integrated on platform.WISP additionally provides many outsides
Pin interface can be used for extending other sensors and external equipment.Since the RF energy of WISP capture is few, generally use low
Power dissipating chip and electronic device.WISP supports EPCglobal Gen2 specification, can be provided by commercial UHF RFID reader
Radio frequency source captures the RF energy of radio frequency source for calculating and perceiving, then according to EPC (Electronic Product
Code) information is transmitted to RFID reader by reflection link by agreement, and data are transmitted to host computer and handled by reader.
Node based on WISP frame is as shown in Figure 1, mainly by antenna, impedance matching circuit, energy collection circuit, pressure regulation
Device, modulation module, demodulation module, MSP430 microcontroller and external sensor composition.Antenna and impedance matching circuit are located at mould
Before quasi- front end, antenna receives radiofrequency signal, and when impedance matching circuit is in matching status, energy collection circuit is by input
Portion radio frequency signal rectification is DC voltage, and by power storage in energy storage original part, another part radiofrequency signal passes through demodulation
Module demodulates information to be transmitted to microcontroller.When impedance matching circuit mismatches, radiofrequency signal can be reflected, and be adjusted
Molding block passes through the matching and mismatch of control impedance matching circuit, anti-to realize with this to control the absorption and reflection of signal
To scatter communication, information is sent.Pressure regulator provides stable operating voltage to whole system.Microcontroller is core
Point, it is responsible for calculating, perceive and communicating.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of, and the low-power consumption based on WISP shows node.
Present invention integrated display screen on the passive bus based on WISP, on the basis for having done significant improvement to WISP platform
On, the electronic ink screen (e-Paper) of super low-power consumption is added on node, and using an Energy Saving Strategy in ink screen display
Data.
The technical solution of the present invention is as follows:
The present invention includes antenna, impedance matching circuit, energy collection circuit, pressure regulator, modulation module, demodulation module, micro-
Ink screen circuit in controller, sensor and peripheral hardware.
The antenna is for receiving the radiofrequency signal from reader or environment；
The impedance matching circuit: when impedance matching circuit is in matching status, energy collection circuit is by input
Portion radio frequency signal rectification is DC voltage, and by power storage in energy storage original part, another part radiofrequency signal passes through demodulation
Module demodulates information to be transmitted to microcontroller；When impedance matching circuit mismatches, radiofrequency signal is reflected.
The demodulation module be when impedance matching circuit is in matching status, by envelope detection function,
Information demodulates to be then passed to microcontroller.
The modulation module controls impedance matching circuit in matching kilter by RF switching devices and mismatches shape
Switch between state, realizes backscatter communication.
The function of the energy collection circuit and pressure regulator is realized that the chip is captured by energy-trap chip BQ25570
RF energy, while also being used to generate the working power of microcontroller；The electricity collection of input is stored in super electricity by BQ25570
Hold the inside, when voltage rises to a preset threshold value, indicates that capacitor is full of, chip BQ25570 stops collecting electric energy.
SI1016X chip is used in the ink screen circuit, and SI1016X is controlled by microcontroller to control ink
Shield the connection and closing of power supply.
When node captures certain energy, microcontroller electrification reset is introduced into sleep pattern, continues to capture energy
Amount.When detecting voltage abundance, node acquire sensor data, after acquire sensing data, if voltage abundance and
It has data to transmit, then encapsulates data, send data；Sleep pattern is gone successively to if energy deficiency.When voltage abundance
When, it is reached if any data, then node receives data, data processing is then carried out, if having data to send at this time, encapsulation of data
Packet sends data.If refresh ink screen is needed at this time, and voltage is sufficient, with regard to carrying out ink screen refresh operation.If voltage
Insufficient and need refresh ink screen, then node enters sleep pattern, captures energy, until voltage abundance refresh ink screen again.Ink
After water screen refreshes, node enters sleep pattern, continues to capture energy.Node also enters sleep mould after data are sent
Formula.
Beneficial effects of the present invention: the present invention uses energy capture technology, and the RF energy in capturing ambient is node confession
Electricity does not need battery and power sourcing equipment, environmentally protective and inexpensive, makes node continuously operating.The present invention is using more efficient
BQ25570 energy capture chip, it is lower and keep the electronic ink screen that shows of image during power down to be added to power consumption.At these
On the basis of improved, a kind of efficient energy management strategies are used, the utilization efficiency of energy is improved, enable ink screen
It is worked normally on the energy capture node based on WISP.
Detailed description of the invention
Fig. 1 is node circuit module diagram.
Fig. 2 is collection of energy and electric power management circuit.
Fig. 3 is ink screen circuit.
Fig. 4 is energy management strategies.
Specific embodiment
Below in conjunction with drawings and examples, the invention will be further described.
One kind is present embodiments provided in low-power consumption energy capture, less radio-frequency reflection communication field is shown in ink screen
The technology of registration evidence.Technical solution provided in this embodiment is as follows, includes " circuit design " and " Energy Saving Strategy ".
Circuit design: although the present embodiment is developed on WISP platform base, WISP platform itself is also done
Sizable improvement.In collection of energy and electric power management circuit, such as Fig. 2, this circuit is by BQ25570 energy-trap chip
U1, super capacitor SupCap, inductance L1, L2, resistance R1, R2, R3, R4, R5, R6, R7, capacitor C1, C2, C3, C4, C5, C6 group
At.U1 the 0th, 1,5,9,15,17 pins meet GND.The 4th transport charge of one end connection U1 of capacitor C1, one end connects GND.Capacitor
One end of C2, C3 are connected to the 2nd pin of U1 together, and other end is connected to GND.One end of capacitor C4, C5 connect U1's together
19th pin, other end is connected to GND, and the 19th of U1 is connected with the 3rd pin, and super capacitor one end is connected in the 18th of U1
Pin, the other end are connected to GND, and one end of capacitor C6 is connected with one end of inductance L2, and the other end is connected with GND, and L2 is in addition
One end is connected with the 16th pin of U1.The both ends of inductance L1 are connected with the 2nd of U1 with 20 pins, the 6th and 13 pin phases of U1
Connection.One end of resistance R1, R3, R6 are connected to the 8th pin of U1 together, and the other end of R1 and one end of R5 are connected to U1's
7th pin, the other end of R3 and one end of R2 are connected to the 10th pin of U1, and the other end of R2 and one end of R4 are connected to
The 11st pin of U1, the other end of R6 and one end of R7 are connected to the 12nd pin of U1, and the other end of R5, R4, R7 all connect
To GND.
In collection of energy and electric power management circuit, the present embodiment is captured using the BQ25570 chip of Texas Instruments
RF energy, while BQ25570 also is used to generate the working power of microcontroller.BQ25570 is that a super low-power consumption is highly integrated
The chip of energy acquisition is specially used for effective acquisition and the microwatt for managing various different DC sources generations to the electric power of milliwatt
The faint electric energy caused by capture and management electromagnetism, heat, mechanical oscillation etc..The energy capture and collection efficiency of this chip
It is more high-efficient than the energy-trap chip S-882Z on WISP platform.Vreg in figure is the work electricity of system after voltage is adjusted
Pressure, Vpump be Anneta module by electromagnetic wave signal it is converted come voltage, as entire collection of energy and electric power management circuit
The electricity collection of input is stored in inside super capacitor by input, BQ25570 chip, when storage is to a threshold value, electricity
Hold and collect completely, BQ25570 will stop collecting electric energy.This threshold value is that capacitor is full of voltage threshold, can be according to oneself
Voltage threshold is set using needing, the setting of value meets following formula:
Vthreshold=1.5*1.21* ((R1+R5)/R5)
The capacitor of the present embodiment setting is 4.25V full of voltage threshold, which has power management function, by setting
The supply voltage for adjusting the corresponding adjustable system of resistance is set, voltage adjusting meets following formula:
Vreg=1.21* ((R6+R7)/R7)
Since the operating voltage of ink screen is 3.3V, the supply voltage of system is set 3.3V by the present embodiment.Because
When carrying out Refresh Data to ink screen, large energy is needed, therefore uses the super capacitor of AVX Corp. to store penetrating for capture
Frequency energy, the leakage current very little of this capacitor, capacity is using 15mF.
Ink screen circuit design such as Fig. 3, this circuit is by SI1016X chip U2, resistance R8, R9 and ink screen interface J1 group
At.Pin 1 in U2 meets GND, and one end of pin 5,6 and resistance R9 links together, the other end of R9 and the 4th pin of U2
It is connected, and is connected on supply voltage.The 2nd pin of U2 is connected with one end of resistance R8, and is connected to the master of system
The 19th pin of chip MSP430FR5969 microcontroller U0, the other end of R8 are connected to GND.The 8th of ink screen interface J1
Pin is connected with the 3rd pin of U2, and the 7th pin of J1 is connected to GND, J1 the 1st, 2,3,4,5,6 pins be connected respectively to main core
Piece U0 the 17th, 18,28,27,11,24 pins.
In terms of ink screen circuit design, the present embodiment shows corresponding data, electric ink using electronic ink screen
The power consumption of screen is very low, and the content that screen is shown after power down can be always maintained at, and only needs to consume energy when screen-refresh
Amount, what the present embodiment was selected is the ink panel module of micro- snow electronics.By SPI communication, is controlled and refreshed by microcontroller
Electronic ink screen.SI1016X is controlled by microcontroller to control the connection and closing of ink screen power supply.Because if directly will
The power supply of system and the power supply power supply line of ink screen connect, even when screen does not refresh, power supply can also be supplied to ink screen always
Electricity can consume a large amount of energy in this way, and it is insufficient to lead to system capacity, therefore only need to power when refreshing to ink screen.
Energy Saving Strategy:
In order to extend the working time of node, a method is to improve energy capture efficiency, captures more energy, another
A method is exactly to reduce the power consumption of WISP node, for example, by using the electronic component of super low-power consumption, reduces being averaged for microcontroller
Power consumption.There are two types of modes for microcontroller in WISP, and one is operating mode, microcontroller full speed operation acquires sensor number
According to, calculate, communication, consume very big energy.Another mode is sleep pattern, and in a sleep mode, the total current of circuit is not
Several microamperes are crossed, power consumption is very low.Therefore in the case where guaranteeing that node works normally, microcontroller is allowed to be in sleep mould as far as possible
Under formula, the consumption of energy can be greatly reduced in this way.In this regard, proposing an energy management strategies, one is devised first
Electric voltage observation circuit judges whether the electricity stored in capacitor is sufficient for monitoring the voltage at super capacitor both ends with this.Such as
Fruit not enough power supply is with refresh ink screen, and when carrying out refresh operation, will cause ink screen refresh operation do not complete also it is just not out of power,
Cause to refresh it is unsuccessful, whole system as system cut-off and lose data.Entire operation process is as shown in figure 4, node
Certain energy is captured, microcontroller electrification reset is introduced into sleep pattern into main program, continues to capture energy.Work as inspection
The data that sensor is acquired when surveying voltage abundance, after having acquired sensing data, if voltage is sufficient and has data to pass
It is defeated, it encapsulates data, sends data；Sleep pattern is gone successively to if energy deficiency.When voltage abundance, there is data arrival
When, node receives data, then carries out data processing, if having data to send at this time, encapsulated data packet, sends number
According to.If refresh ink screen is needed at this time, and voltage is sufficient, with regard to carrying out ink screen refresh operation.If undertension and need
Refresh ink screen is wanted, then node enters sleep pattern, captures energy, waits until that voltage is sufficient, then refresh ink screen.Ink screen
After refreshing, node enters sleep pattern, continues to capture energy.The data of node will also enter sleep mould after being sent
Formula.
Claims (1)
1. the low-power consumption based on wireless identification aware platform WISP shows node, including antenna, impedance matching circuit, collection of energy
Ink screen circuit in circuit, pressure regulator, modulation module, demodulation module, microcontroller, sensor and peripheral hardware；
The antenna is for receiving the radiofrequency signal from reader or environment；
The impedance matching circuit: when impedance matching circuit is in matching status, energy collection circuit is by the part of input
RF energy is rectified into DC voltage, and by power storage in energy storage original part, another part radiofrequency signal passes through demodulation module
Information is demodulated to be transmitted to microcontroller, when impedance matching circuit mismatches, radiofrequency signal is reflected；
The demodulation module is when impedance matching circuit is in matching status, by envelope detection function, information
It demodulates to be then passed to microcontroller；
The modulation module by RF switching devices control impedance matching circuit matching kilter and mismatch state it
Between switch, realize backscatter communication；
It is characterized by:
The function of the energy collection circuit and pressure regulator is realized that the chip captures radio frequency by energy-trap chip BQ25570
Energy, while also being used to generate the working power of microcontroller；The electricity collection of input is stored in super capacitor by BQ25570
Face indicates that capacitor is full of when voltage rises to a preset threshold value, and chip BQ25570 stops collecting electric energy；
Chip SI1016X is used in the ink screen circuit, and SI1016X is controlled by microcontroller to control ink screen electricity
The connection and closing in source；
When node captures certain energy, microcontroller electrification reset is introduced into sleep pattern, continues to capture energy；Work as inspection
When surveying voltage abundance, node acquires the data of sensor, after having acquired sensing data, if voltage is sufficient and has data to
Transmission then encapsulates data, and sends data；Sleep pattern is gone successively to if energy deficiency；When voltage abundance, if any number
When according to reaching, then node receives data, then carries out data processing, if having data to send at this time, encapsulated data packet,
Send data；If refresh ink screen is needed at this time, and voltage is sufficient, with regard to carrying out ink screen refresh operation；If voltage is not
Foot and refresh ink screen is needed, then node enters sleep pattern, energy is captured, until voltage abundance refresh ink screen again；Ink
After screen refreshes, node enters sleep pattern, continues to capture energy；Node also enters sleep mould after data are sent
Formula.
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| WO2023207993A1 (en) * | 2022-04-29 | 2023-11-02 | 京东方科技集团股份有限公司 | Display panel and display apparatus |
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Application publication date: 20190308 |