CN109086641A - The self-adapting tuning label of integrating passive wireless sensor - Google Patents
The self-adapting tuning label of integrating passive wireless sensor Download PDFInfo
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- CN109086641A CN109086641A CN201811069727.XA CN201811069727A CN109086641A CN 109086641 A CN109086641 A CN 109086641A CN 201811069727 A CN201811069727 A CN 201811069727A CN 109086641 A CN109086641 A CN 109086641A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10297—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves arrangements for handling protocols designed for non-contact record carriers such as RFIDs NFCs, e.g. ISO/IEC 14443 and 18092
Abstract
The invention discloses a kind of self-adapting tuning labels of integrating passive wireless sensor comprising label antenna, label chip and the sensing chip to become one；Wherein, label antenna includes microstrip line and feeding network, and the energy signal that label antenna is sent to receive reader or hyperfrequency power supply；Wherein, label chip includes that self-adapting tuning circuit, electric power management circuit, demodulator circuit, modulation circuit, digital baseband, master control and data processing unit and nonvolatile storage are sequentially connected；Wherein, sensing chip includes sensing quantization modules, is connected with master control and data processing unit；Wherein, label antenna is connected with the self-adapting tuning circuit of label chip.Whereby, the self-adapting tuning label of integrating passive wireless sensor of the invention improves the accuracy rate of tag recognition distance and data transmission, also improves environmental suitability, reliability and the service life of sensor.
Description
Technical field
The present invention relates to radio frequency identification and passive sensor fields, especially with regard to a kind of integrating passive wireless sensor
Self-adapting tuning label.
Background technique
Radio frequency identification (Radio Frequency Identification, RFID) is a kind of contactless automatic identification
Technology is used widely in many industries.Typical RFID system includes label, reader and application system, label without
It needs battery to power, provides energy by reader request signal, when it is in the effective read range of reader, rely on electromagnetic wave
Coupling generates induced current inside it and uses for the other circuits of chip interior, and carries out signal transmission by reflection mode.?
Many sensor application occasions need sensor to have passive nothing due to the conditions limitation such as power supply mode, the device space and safety
The features such as line, such as power equipment temperature monitoring, vibration monitoring application field.For these reasons, by sensor and hyperfrequency
RFID technique is combined, so that distinguishing features such as sensor have passive power supply, wireless transmission, small in size, the service life is long.As specially
Benefit 201710436238.2 uses ultra-high frequency RFID technology and temperature sensing integrated chip, realizes switchgear wireless and passive thermometric,
And have many advantages, such as that chip volume is small and the long-life.But used ultra-high frequency RFID technology is in many applications, due to multiple
Heterocycle border leads to its reduced performance, and tuned frequency shifts, and then passes label appearance reading Distance Shortened or data reliably
Defeated variation.
For the maximum delivered for realizing energy between label and reader, when RFID tag designs need to by the impedance of label chip and
The input impedance of antenna carries out conjugate impedance match, to realize maximum power transfer.Maximum power transfer determines label maximum and most
Small reading distance.When sensor tag is mounted on metal surface, the impedance of antenna can change, the reading distance meeting of label
Reduction rapidly generallys use ceiling capacity TRANSFER METHOD (impedance conjugate impedance match) for this deficiency for solving ultra-high frequency RFID technology
Come carry out anti-metal tag and broadband tag antenna design, can in tag antenna design or chip resonance circuit be added matching
Network makes label have broadband properties.
Patent 103022649A discloses a kind of impedance adjustable label antenna of uhf band RFID system, using to label
Antenna carries out broadband design, carries out impedance matching adjusting by adjusting height and the width of π type matching network.But pair net
Network cannot be adjusted after the completion of antenna manufactures, and cannot realize that impedance is self-regulated in practical application.
Impedance adjustable label antenna disclosed in patent 20131011910.2, by the angle for adjusting dipole antenna two-arm
Tuning is realized, but this method applies that there is adjustment difficult, cannot accurately adjust, the problems such as poor reliability, simultaneously because the day
Line is not suitable for and sensor carries out integrated application for two-dimensional structure.
Patent 201720672864.7 discloses a kind of impedance adjusting label antenna, using metallic reflection plate and guides pole plate into
Elastic connection guides polar plate position by adjusting come capacitance value, and then adjusts input impedance.It is deposited when this method practical application
Cannot be precise and stable in impedance adjusting, there is the problems such as reliability reduction in elastic, it is fast to can not achieve impedance when used for a long time
Fast accurate matching.
In addition, there are also other published methods, impedance auto-match network is added such as in reader circuitry, by measuring
Electric bridge, capacitor array network and controller composition, scan all capacitor combinations using tuning algorithm, find amplitude and phase offset
In a two-dimensional plane apart from the shortest path of zero point, and then obtains one group of capacitance and carry out impedance matching.This method is in certain journey
Reader can be achieved on degree and label impedance self-adaptive is adjusted, but this method is adjusted for reader end, is not suitable for
It is integrated into label chip and solves inside tags resistance matching problem.
In some applications, when being mounted on inside a closed complicated operation of metal structure equipments such as wireless sourceless sensor,
Neighbouring metal and liquid will change radio frequency electromagnetic field, and tuning circuit is caused not retune.201710436238.2 disclosure of patent
The impedance of temperature measuring label do not have automatic regulation function, when sensor tag is for the monitoring application of switchgear temperature of cable junction
Realize tuning, but same sensor tag in Mume flower contact temperature monitoring in application, near sensor tag installation site
When metal structure or closed environment humidity, tuned frequency will be made to shift, circuit is detuning, and then tag read distance is caused to contract
It is short.
Impedance adjusting method disclosed in patent 103022649A and patent 20131011910.2, which belongs to, carries out label antenna
Special designing, patent 201720672864.7 belongs to mechanical adjusting impedance, although these methods can subtract to a certain extent
Few frequency changes the influence to antenna impedance, but can be to sacrifice the performance of all frequency ranges as cost.In addition, when practical application these
Method needs to carry out Fine design according to each scene difference and adjustment is just no longer adapted to when application scenarios environment slightly changes.
These disadvantages greatly reduce the environmental suitability and reliability of sensor tag, limit the extensive use of sensor tag.
Announced in reading and writing device antenna be added impedance auto-match network method, this method be for reader end into
Row is adjusted, and not can solve label antenna and inside chip resistance matching problem.
The information disclosed in the background technology section is intended only to increase the understanding to general background of the invention, without answering
When being considered as recognizing or imply that the information constitutes the prior art already known to those of ordinary skill in the art in any form.
Summary of the invention
The purpose of the present invention is to provide a kind of self-adapting tuning labels of integrating passive wireless sensor, and which raises marks
The accuracy rate that label identification is transmitted away from discrete data, also improves environmental suitability, reliability and the service life of sensor.
To achieve the above object, the present invention provides a kind of self-adapting tuning label of integrating passive wireless sensor,
Including the label antenna, label chip and sensing chip to become one；Wherein, label antenna includes microstrip line and transmission network
Network, and the energy signal that label antenna is sent to receive reader or hyperfrequency power supply；Wherein, label chip includes certainly
Adapt to tuning circuit, electric power management circuit, demodulator circuit, modulation circuit, digital baseband, master control and data processing unit and it is non-easily
Memory is lost to be sequentially connected；Wherein, sensing chip includes sensing quantization modules, is connected with master control and data processing unit；
Wherein, label antenna is connected with the self-adapting tuning circuit of label chip.
In a preferred embodiment, self-adapting tuning circuit includes variable capacitor array, power-sensing circuit, first
Sigma-delta ADC's, adaptation control circuit are sequentially connected.
In a preferred embodiment, sensing quantization modules include digital quantity sensing module and analog quantity sensing module.
In a preferred embodiment, digital quantity sensing module is to export digital quantity signal, and passes through master control and number
According in processing unit deposit nonvolatile storage.
In a preferred embodiment, analog quantity sensing module is to export analog signals, and passes through programme-controlled gain
After controlling amplifier and the second Sigma-delta ADC's progress analog-to-digital conversion, then it is non-by master control and data processing unit deposit
In volatile memory.
In a preferred embodiment, label chip carries out electricity after the radiofrequency signal for receiving label antenna transmission
Source conversion and self-adapting tuning, and start sensing chip and carry out status monitoring and store Condition Monitoring Data to non-volatile memory
In device；Wherein, after label chip receives the command signal of reader, the feedback signal in nonvolatile storage is modulated
After be transmitted to label antenna.
In a preferred embodiment, feedback signal includes Condition Monitoring Data, sensor calibration data, the calibration of power
Data, RF signal power detected value and sensor identification.
In a preferred embodiment, Condition Monitoring Data is temperature or humidity or pressure or vibration.
In a preferred embodiment, label chip further includes clock circuit, to generate reference clock.
Compared with prior art, the self-adapting tuning label of integrating passive wireless sensor according to the present invention improves
The accuracy rate of tag recognition distance and data transmission, also improves environmental suitability, reliability and the service life of sensor.
Detailed description of the invention
Fig. 1 is that the structure of the self-adapting tuning label of integrating passive wireless sensor according to an embodiment of the present invention is shown
It is intended to.
Fig. 2 is the workflow of the self-adapting tuning label of integrating passive wireless sensor according to an embodiment of the present invention
Cheng Tu.
Fig. 3 is variable in the self-adapting tuning label of integrating passive wireless sensor according to an embodiment of the present invention
The circuit theory schematic diagram of capacitor array.
Fig. 4 be in the self-adapting tuning label of integrating passive wireless sensor according to an embodiment of the present invention two into
The schematic equivalent circuit of system weighting varactor array.
Fig. 5 is the power in the self-adapting tuning label of integrating passive wireless sensor according to an embodiment of the present invention
The circuit theory schematic diagram of detection circuit.
Fig. 6 is adaptive in the self-adapting tuning label of integrating passive wireless sensor according to an embodiment of the present invention
Answer the circuit theory schematic diagram of control circuit.
Specific embodiment
With reference to the accompanying drawing, specific embodiments of the present invention will be described in detail, it is to be understood that guarantor of the invention
Shield range is not limited by the specific implementation.
Unless otherwise explicitly stated, otherwise in entire disclosure and claims, term " includes " or its change
Changing such as "comprising" or " including " etc. will be understood to comprise stated element or component, and not exclude other members
Part or other component parts.
As shown in Figures 1 to 6, Fig. 1 is the adaptive of integrating passive wireless sensor according to an embodiment of the present invention
Tune the structural schematic diagram of label；Fig. 2 is the adaptive tune of integrating passive wireless sensor according to an embodiment of the present invention
The work flow diagram of humorous label；Fig. 3 is the self-adapting tuning of integrating passive wireless sensor according to an embodiment of the present invention
The circuit theory schematic diagram of variable capacitor array in label；Fig. 4 is that integrating passive according to an embodiment of the present invention is wireless
The schematic equivalent circuit of binary weighting varactor array in the self-adapting tuning label of sensor；Fig. 5 is according to this hair
The circuit theory of power-sensing circuit in the self-adapting tuning label of the integrating passive wireless sensor of a bright embodiment is shown
It is intended to；Fig. 6 is adaptive in the self-adapting tuning label of integrating passive wireless sensor according to an embodiment of the present invention
The circuit theory schematic diagram of control circuit.
A kind of self-adapting tuning label of integrating passive wireless sensor according to the preferred embodiment of the present invention comprising
Label antenna 11, label chip 12 and the sensing chip 13 to become one；Wherein, label antenna 11 includes microstrip line and feedback
Electric network, and the energy signal that label antenna 11 is sent to receive reader or hyperfrequency power supply；Wherein, label chip
12 include self-adapting tuning circuit 101, electric power management circuit 102, demodulator circuit 103, modulation circuit 104, digital baseband 105,
Master control and data processing unit 106 and nonvolatile storage 107 are sequentially connected；Wherein, sensing chip 13 includes sensing quantization mould
Block is connected with master control and data processing unit 106；Wherein, the self-adapting tuning of label antenna 11 and label chip 12 electricity
Road 101 is connected.
In a preferred embodiment, self-adapting tuning circuit 101 includes variable capacitor array 1011, power detection electricity
Road 1012, the first Sigma-delta ADC's 1013, adaptation control circuit 1014 are sequentially connected.
In a preferred embodiment, sensing quantization modules include digital quantity sensing module 1301 and analog quantity sensing mould
Block 1301 '；Digital quantity sensing module 1301 is stored in export digital quantity signal, and by master control and data processing unit 106
In nonvolatile storage 107；Analog quantity sensing module 1301 ' is put to export analog signals, and by programmed gain control
After big device 1302 and the second Sigma-delta ADC's 1303 carry out analog-to-digital conversion, then deposited by master control and data processing unit 106
Enter in nonvolatile storage 107.
In a preferred embodiment, label chip 12 receive label antenna 11 transmission radiofrequency signal after, into
The conversion of row power supply and self-adapting tuning, and start sensing chip 13 and carry out status monitoring and store Condition Monitoring Data to non-easy
It loses in memory 107；It wherein, will be anti-in nonvolatile storage 107 after label chip 12 receives the command signal of reader
Feedback signal is transmitted to label antenna 11 after being modulated.
In a preferred embodiment, feedback signal includes Condition Monitoring Data, sensor calibration data, the calibration of power
Data, RF signal power detected value and sensor identification；Condition Monitoring Data is temperature, humidity, pressure or vibration；Label
Chip 12 further includes clock circuit 108, to generate reference clock.
In practical applications, label antenna 11 is used to receive the energy signal that reader or hyperfrequency power supply are sent,
It is connected with label chip 12, carries out signal transmission, and communicated with external reader；Label chip 12 is receiving label
After the radiofrequency signal that antenna 11 transmits, power supply conversion and self-adapting tuning are carried out, starting sensing chip 13 carries out status monitoring simultaneously
Monitoring data are stored, after receiving reader command signal, are transmitted after the feedback signal in memory is modulated
To label antenna 11, wherein feedback signal includes Condition Monitoring Data, sensor calibration data, power calibration data, radio frequency letter
Number power detection value and sensor identification；Sensing chip 13 measures state quantity of the equipment, state quantity of the equipment can for temperature/
Humidity/pressure/vibration etc., stores after monitoring data are quantified.
The workflow of the self-adapting tuning label of integrating passive wireless sensor of the invention is as follows:
(1) label starts: label antenna 11 incudes radio frequency continuous wave (CW) first, to activate the mark in identification range
Label, by the Power Management Unit inside label chip 12, are converted to direct current supply voltage for the radiofrequency signal received, for certainly
Tuning circuit work provides energy；
(2) self-adapting tuning: label chip 12 starts self-tuning circuit, is believed first by power detection circuit measuring radio frequency
Number performance number carries out analog-to-digital conversion through the first sigma-delta digital analog converter (sigma-delta ADC) 1013, and adaptation control circuit 1014 is right
RF signal power value is compared, and just reconciliation fine tuning is carried out to variable capacitor array 1011 according to control logic, when power transformation is held
Array 1011 changes capacitance (increase or subtract) according to control logic, compares the power detection value of variation front and back, power after variation
Detected value increases, and illustrates that tuning is correct, continues to become capacitor array 1011 according to change direction adjustment；Power detection after variation
Value reduces, and stops current change direction, adjusts in the opposite direction, power detection value persistently increases, when power detection value goes out for the first time
When now reducing, previous state is returned, terminates coarse mode；Start fine mode, until power detection value becomes repeatedly in maximum value
Change, judge to change number by counter, stops changing when changing number and reaching 4 times, complete self-adapting tuning, at this time capacitor
The optimum impedance for representing antenna and chip under current operating environment and working frequency is arranged in device array 1011, although humorous at this time
Vibration frequency and reader emission signal frequency are not exactly the same, but very close to emission signal frequency.After the completion of self-tuning, open
Dynamic chip remaining circuit power supply, while current power detected value being stored in nonvolatile storage 107, through ovennodulation, by power
Detected value is sent to reader.Using self-tuning circuit, the alternating voltage that chip can be made to obtain increases, and improves the low pressure of chip
Performance is inputted, the accuracy rate of tag recognition distance and data transmission is improved.
(3) starting of sensing chip 13 monitoring and storage: the sensing module of sensing chip 13 is divided into digital quantity and analog quantity, number
The output of word amount sensing module 1301 is with temperature/humidity/pressure/vibration associated change digital quantization value, such as digital temperature sensing
Device uses pulses switch (TPC) relevant to temperature, generates a clock pulse signal in a linear relationship with temperature, utilizes one
A temperature independent reference clock to carry out the pulse width (PW) value as time-to-digit converter (TDC) i.e. counter
Quantization, so that it may obtain the digital quantization value of the PW value varied with temperature.Digital sensors module 1301 and master control and data
Processing unit 106 is directly connected to, and carries out the operations such as data storage, calibration, modulation transmission；And analog quantity sensing module 1301 ' is defeated
Out with temperature/humidity/pressure/vibration associated change analog signal, through the amplification of programmed gain control (AGC) amplifier 1302 and
It connect, is counted with master control and data processing unit 106 after second sigma-delta digital analog converter (sigma-delta ADC), 1303 analog-to-digital conversion
According to operations such as storage, calibration, modulation transmissions.
(4) label write-in and data are sent: after the completion of self-tuning, the power supply of bootrom remaining circuit passes through clock circuit
108 generate reference clock, and by master control and data processing unit 106 and reader normal communication, label chip 12 passes through demodulation
Circuit is demodulated, and is judged to execute write operation or read operation instruction, when executing write command, be compiled by digital baseband 105
Code writes data into nonvolatile storage 107 under clock effect；When executing reading instruction, master control and data processing unit
106 will be modulated in the data feeding modulation circuit 104 in nonvolatile storage 107, use ASK for label chip 12
(amplitude shift keying method) backscatter modulator only carries out chip impedance and antenna impedance Adaptive matching under non-modulation state,
Chip obtains energy and maximizes, and label is in " reception state "；When to chip backscatter signal, core is changed by modulation circuit
Piece impedance is completely reflected the power reached at antenna and chip interface, completes transducing signal and sends.
According to function needs, sensing data, which reads implementation and can be used, to be continued to monitor reading manner or continues to monitor inspection
Reading manner:
(1) when continuing to monitor reading, continued power and data communication, (temperature/humidity/pressure/vibration are carried out using reader
It is dynamic) sensing data passes through digital baseband 105 and modulation circuit 104 carries out coded modulation, data are sent out by backscattering mode
Reader is given, this mode is suitble to real-time device status monitoring service application；
(2) it when continuing to monitor inspection reading, is powered using hyperfrequency power supply to label chip 12 and sensing chip 13,
Monitoring data (temperature/humidity/pressure/vibration) is stored in nonvolatile memory by label chip 12 by sensing chip 13
In (Flash or EEPROM), the monitoring data in memory are read using reader when inspection, this mode is suitble to equipment movement to patrol
Examine service application.
Embodiment one: variable capacitor array 1011 is further limited on the basis of Fig. 1, as shown in figure 3, this implementation
The variable capacitor array that column provide includes equivalent capacitance array 31 and binary weighting varactor array 32, coarse mode use by
The equivalent capacitance array of larger capacitance, can quickly adjust capacitance makes resonance frequency close to tranmitting frequency；Fine mode is using single
First fractional value (capacitance is smaller) binary weighting varactor array 32 adjusts capacitance thinner, real in the frequency range of very little
Existing higher frequency resolution.
Equivalent capacitance array 31 is made of fixed value capacitor 301C1~301Cn and switch 302K1~302Kn, the present embodiment
Fixed value capacitor and switch are constituted using PMOS tube, 32 capacitances is used to be cascaded for the capacitor of C, realizes equivalent capacitance array
31 using cell capacitance value as the quick adjusting of step-length.
Binary weighting varactor array 32 is made of fixed value capacitor 303a~303c, and the present embodiment uses unit score
It is worth binary weighted capacitance value, fixed value capacitor 303a~303c capacitance is respectively 1/8C, 1/4C and 1/2C, and fine tuning capacitor becomes
Change value are as follows: 0,1/8C, 1/4C, 3/8C, 1/2C, 5/8C, 3/4C, 7/8C.
Embodiment two: binary weighting varactor array 32 on the basis of example 1, carries out varactor further
It limits, as shown in figure 4, varactor uses series connection PMOS varactor 303a~303c back-to-back, by the lining of two PMOS varactors
Bottom connects, and S and D are connected, and forms transoid varactor, improves varactor in the non-thread of high capacitance area and low capacitive region
Property, in height capacitive region, the capacitance of varactor is unobvious with control voltage change, improves the stability of capacitance.
Antenna P and N-terminal are connected to VDD power end and ground terminal by diode, make end-point voltage VDD/2, varactor S and
The connection of the end D, voltage VDD/2；Adaptation control circuit 1014 export control signal voltage be connected to varactor 303a~
The substrate of 303c alternately changes between VDD and 0V, by controlling signal, the control work of varactor array 32 in high capacity and
Low capacitance, maximum capacitor value 7/8C, position of minimum capacitance 0, capacitance adjustment step-length are 1/8C.
Embodiment three: power-sensing circuit 1012 is further limited on the basis of Fig. 1, as shown in figure 5, by two poles
Pipe detecting circuit 51, chopper circuit 52, low noise programme-controlled gain amplifying circuit 53, synchro detection circuit 54 form.Radiofrequency signal
Detection is carried out by diode detection circuit 51, exports direct current or gradual AC signal, carries out copped wave tune by chopper circuit 52
System, modulated AC signal realize controllable gain amplification, amplified exchange by low noise programme-controlled gain amplifying circuit 53
Signal is demodulated by synchro detection circuit 54, and the signal after demodulation is through the first sigma-delta digital analog converter (sigma-delta ADC)
1013 carry out analog-to-digital conversion, complete the acquisition of radio-frequency power detected value.
Diode detection circuit 51 is by rf filtering capacitor 5101, resistance 5102, resistance 5103 and 5104, build-out resistor
5105, detector diode 5106 and 5107, filter capacitor 5108 and 5109 form.5102 structure of rf filtering capacitor 5101 and resistance
At high-pass filter, dc noise is filtered out；Resistance 5103 and 5104 constitutes 3dB attenuator, decays to big signal, improves two
The pole pipe detection range of linearity and burn-out resistance；Build-out resistor 5105 carries out impedance matching, guarantees that RF signal power maximizes
Transmission；Detector diode 5106 and 5107 uses plane doping barrier diode or low barrier Schottky diode, utilizes detection
Diode square-law region carries out detection, and output voltage is made to be proportional to square of the RF signal power of input, is examined by measurement
Wave voltage value measures RF signal power value.
Chopper circuit 52 is made of switch 5201 and 5202, chopper driver 5203.Switch 5201 and 5202 pair detection two
The small-signal of pole pipe output is balanced chopping modulation, and noise spectral density is shifted, and it is sensitive to improve Detection of Weak Signals
Degree；Chopper driver 5203 exports chopping signal, and control switch 5201 and 5202 carries out square-wave frequency modulation, and the present embodiment uses
220Hz square wave is as chopping signal.
Low noise programme-controlled gain amplifying circuit 53 is by capacitance 5301 and low noise low noise gain-programmed amplifier
5302 compositions.Low noise can be used in low noise gain-programmed amplifier 5302, high-gain JFET constitutes first order amplifier, times magnification
Number is 500 times, is constituted using program controlled switch, attenuator circuit, difference amplifier, and amplification factor is 10~100 times, overall magnification
It is 5000~50000 times, output signal amplitude is within the scope of 0~3V.
Synchro detection circuit 54 is made of switch 5401, filter 5402, and switch 5401 is controlled in chopper driver 5203
Lower and filter 5402 (low pass or band logical) collectively forms synchro detection circuit, and the signal that amplifying circuit 53 exports is solved
It adjusts, realizes the synchronous amplification of rectified signal that diode detection circuit 51 exports, acquired convenient for subsequent conditioning circuit.
Example IV: adaptation control circuit 1014 is further limited on the basis of Fig. 1, as shown in Figure 6.By prolonging
When device 61, digital comparator 62, bidirectional shift register 63, cycle counter 64, direction counter 65.ADC analog-digital converter
The voltage signal Vt of 1013 acquisitions forms Vt1 by the delay of delayer 61, and Vt indicates current detection value, and Vt1 indicates previous moment
Vt and Vt1 is sent into digital comparator 62 and is compared by detected value, is worked as Vt > Vt1 output logic high 1, otherwise is exported logic
Low level 0.High level 1 indicates that current voltage detected value is bigger than the voltage detecting value before previous moment change, illustrates capacitor array
101 change is in the right direction；Low level 0 and high level 1 indicate exactly the opposite, and direction counter 64 is initially 0.
Bidirectional shift register 63 is using 32 bidirectional shift register storages and changes control signal, 32 control signals
32 switches in equivalent capacitance array 31 are controlled, high 16 of the initial value D1 [n-1:0] of register are 0, and low 16 are 1
(0...0 1...1), the control switch left-half closure right half part of equivalent capacitance array 31 is opened after representing initialization, is opened
It closes towards when moving left variation, capacitance reduces again, and resonance frequency is increasing, and switch change moves to right and move to left exactly the opposite.Numerical value
When the output of comparator 62 is logic high 1, bidirectional shift register 63 is moved to right, and the left side mends 0, represents capacitor reduction, resonance frequency
Rate increases；Bidirectional shift register 63 moves to left, and the right mends 1, represents capacitor increase, and resonance frequency reduces.When equivalent capacitance array
When 31 power detection values reduce for the first time, the end the S output 1 of bidirectional shift register 63 returns to previous state, terminates coarse adjustment mould
Formula.
Cycle counter 64 uses 3 cycle counters, and count status is in 000~111~000 circulation change, control
Varactor 303a~303c of binary weighting varactor array 32 is changed, and control signal is logic level 1, represents transfiguration
Pipe is in high capacitance, and control signal is logic level 0, represents varactor and is in low capacitor.When terminating coarse adjustment, when the end EN is 1, open
Dynamic fine mode, 64 initial value D2 [3:0] of cycle counter are 000, when direct circulation capacitance from minimum change be maximum, it is inverse to follow
When ring, capacitance is minimum from maximum change.When tuned frequency is close to tranmitting frequency, switch state changes repeatedly, the side of passing through
Judge to change number to counter 65, when changing number and reaching 4 times, output high level terminates fine tuning, completes self-adapting tuning.
In one possible implementation, electric power management circuit 102, demodulator circuit 103, modulation circuit 104, digital base
Band 105, master control and data processing unit 106, nonvolatile storage 107, clock circuit 108 use the existing maturation of RF tag
Technology realizes that the present invention is no longer described in detail.
In one possible implementation, prior art can be used in sensing chip 13, such as temperature sensing chip 13, substantially
Principle is to generate a clock pulse signal in a linear relationship with temperature, benefit using pulses switch (TPC) relevant to temperature
A temperature independent reference clock is used as time-to-digit converter (TDC) i.e. counter to quantify to the PW value,
It can show that the digital quantization value of the PW value varied with temperature, the present invention are no longer described in detail.
In short, the self-adapting tuning label of integrating passive wireless sensor of the present invention has the following beneficial effects:
1, compared with existing active sensor, the present invention is by temperature/humidity/vibration/pressure sensing chip 13, RFID tag
Chip 12 and label antenna 11 are integrated, while self-adapting tuning technical solution is used inside RFID label chip 12,
It realizes a variety of wireless sourceless sensors simultaneously, makes sensor in metal cabinet or the open air of a wide frequency ranges and air-tight moist
The complex environments such as metallic object remain circuit tuning when applying, and improve environmental suitability, reliability and the use of sensor
Service life；
2, compared with existing RFID tag impedance match technique, the present invention in antenna component designs in addition to carrying out impedance
Match, more core is the realization self-adapting tuning impedance inside label chip 12, greatly reduces answering for artificial impedance adjusting
Polygamy, can make chip obtain alternating voltage increase, improve chip low pressure input performance, improve tag recognition distance and
The accuracy rate of data transmission more has in addition, enormously simplifying the complexity that impedance is adjusted under different application environment and is easy to product
It promotes and applies；
3, compared with RFID reader impedance match technique, the present invention realizes adaptive impedance inside label chip 12
Matching, reduces the requirement to reader, while match time is shorter, improves the performance of label, more have and be easy to showing for label
Field application；
4, compared with existing sensor tag, the present invention, can also be by RF coupling in addition to self-adapting tuning matching advantage
Power detection value is sent to reader, provides signal strength detection data for RFID wireless location or device shifting, greatly expands
The other application of sensor tag.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The aforementioned description to specific exemplary embodiment of the invention is in order to illustrate and illustration purpose.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to the above instruction, can much be changed
And variation.The purpose of selecting and describing the exemplary embodiment is that explaining specific principle of the invention and its actually answering
With so that those skilled in the art can be realized and utilize a variety of different exemplary implementation schemes of the invention and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (9)
1. a kind of self-adapting tuning label of integrating passive wireless sensor, which is characterized in that including the label to become one
Antenna, label chip and sensing chip；
Wherein, the label antenna includes microstrip line and feeding network, and the label antenna is to receive reader or superelevation
The energy signal that frequency power supply is sent；
Wherein, the label chip includes self-adapting tuning circuit, electric power management circuit, demodulator circuit, modulation circuit, digital base
Band, master control and data processing unit and nonvolatile storage are sequentially connected；
Wherein, the sensing chip includes sensing quantization modules, is connected with the master control and data processing unit；
Wherein, the label antenna is connected with the self-adapting tuning circuit of the label chip.
2. the self-adapting tuning label of integrating passive wireless sensor as described in claim 1, which is characterized in that described adaptive
Answer tuning circuit include variable capacitor array, power-sensing circuit, the first Sigma-delta ADC's, adaptation control circuit according to
Secondary connection.
3. the self-adapting tuning label of integrating passive wireless sensor as described in claim 1, which is characterized in that the sensing
Quantization modules include digital quantity sensing module and analog quantity sensing module.
4. the self-adapting tuning label of integrating passive wireless sensor as claimed in claim 3, which is characterized in that the number
Amount sensing module is stored in the nonvolatile storage to export digital quantity signal, and by the master control and data processing unit
In.
5. the self-adapting tuning label of integrating passive wireless sensor as claimed in claim 3, which is characterized in that the simulation
Amount sensing module to export analog signals, and by programmed gain control amplifier and the second Sigma-delta ADC's into
After row analog-to-digital conversion, then by the master control and the data processing unit deposit nonvolatile storage.
6. the self-adapting tuning label of integrating passive wireless sensor as described in claim 1, which is characterized in that the label
Chip carries out power supply conversion and self-adapting tuning, and described in starting after the radiofrequency signal for receiving the label antenna transmission
Sensing chip carries out status monitoring and stores Condition Monitoring Data into the nonvolatile storage；
Wherein, after the label chip receives the command signal of the reader, by the feedback in the nonvolatile storage
Signal is transmitted to the label antenna after being modulated.
7. the self-adapting tuning label of integrating passive wireless sensor as claimed in claim 6, which is characterized in that the feedback
Signal includes the Condition Monitoring Data, sensor calibration data, power calibration data, RF signal power detected value and biography
Sensor mark.
8. the self-adapting tuning label of integrating passive wireless sensor as claimed in claim 7, which is characterized in that the state
Monitoring data are temperature, humidity, pressure or vibration.
9. the self-adapting tuning label of integrating passive wireless sensor as described in claim 1, which is characterized in that the label
Chip further includes clock circuit, to generate reference clock.
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| CN201811069727.XA CN109086641B (en) | 2018-09-13 | 2018-09-13 | Adaptive tuning tag integrated with passive wireless sensor |
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| CN201811069727.XA CN109086641B (en) | 2018-09-13 | 2018-09-13 | Adaptive tuning tag integrated with passive wireless sensor |
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| CN113283565A (en) * | 2021-06-02 | 2021-08-20 | 上海宜链物联网有限公司 | RFID tag chip antenna impedance automatic tuning system and method |
| CN113283565B (en) * | 2021-06-02 | 2024-01-26 | 上海宜链物联网有限公司 | Automatic tuning system and method for antenna impedance of RFID tag chip |
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| CN113283259B (en) * | 2021-07-19 | 2021-10-08 | 江西博星数码科技有限公司 | RFID-based multi-tag radio frequency identification system and method |
| CN113283259A (en) * | 2021-07-19 | 2021-08-20 | 江西博星数码科技有限公司 | RFID-based multi-tag radio frequency identification system and method |
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