CN102722746B - A kind of RFID label tag, rfid system and temperature checking method with temperature sensitive device - Google Patents
A kind of RFID label tag, rfid system and temperature checking method with temperature sensitive device Download PDFInfo
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- CN102722746B CN102722746B CN201210179496.4A CN201210179496A CN102722746B CN 102722746 B CN102722746 B CN 102722746B CN 201210179496 A CN201210179496 A CN 201210179496A CN 102722746 B CN102722746 B CN 102722746B
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Abstract
The present invention provides a kind of RFID label tag, rfid system and temperature checking method with temperature sensitive device, temperature sensitive device forms parallel-connection structure with the antenna of RFID label tag, the circuit that temperature sensitive device is connected with the chip of RFID label tag has a logic circuit controlling break-make, the circuit of this connection is with the part that the logic circuit controlling break-make is chip: when logic circuit disconnects, temperature sensitive device not with sky line parallel, after being now placed on certain temperature levels lower a period of time, the first resonant frequency of antenna and signal intensity keep constant；When logic circuit is connected, temperature sensitive device and sky line parallel, after being now placed on certain temperature levels lower a period of time, now Antenna Operation is under the second resonant frequency；The instruction that RFID tag RFID reader sends is with the break-make of control logic circuit, thus realizes by comparing the change detecting temperature from the difference between the signal intensity of the different frequency of antenna.It can detect variations in temperature at lower cost.
Description
Technical field
The present invention relates to RFID(Radio Frequency Identification, RF identification) technical field, particularly relate to one
Plant RFID label tag, rfid system and the temperature checking method with temperature sensitive device.
Background technology
In recent years, rfid system had become more prevalent.Rfid system is mainly used in the identification to people and thing.General next
Saying, this system includes at least a RFID reader, and this RFID reader can be sent out in the range of a setting
Penetrate and accept the radiofrequency signal from one or more RFID label tag.This RFID label tag is usually encapsulated, can
With patch on one object, it includes that one can carry out the microchip of communication for information with antenna.This microchip is in general
One integrated circuit, it can be used to store and process information, modulation /demodulation radiofrequency signal, and can run other spy
Distinguished service energy.The antenna of RFID label tag is used to receive and send radiofrequency signal, and is commonly available to a kind of special frequency.
In some equipment, when have been used for monitoring the temperature of product local environment with the rfid system of temperature sensitive device
Exceed acceptable temperature.In general these equipment requirements induction installations to have a lasting energy source, is used for
The change of detection temperature, but this can increase the cost of equipment.It addition, some equipment requirements induction installations also will be with a ratio
Relatively device circuit is connected, thus detects the degree size of deviation reference voltage, and this requirement considerably increases the cost of equipment.
In a word, improving what rfid system was a need for, it requires do not using lasting energy source or using a kind of low cost
Adjunct circuit time can be used to detect variations in temperature.
Summary of the invention
The embodiment of the present invention provides a kind of RFID label tag, rfid system and temperature checking method with temperature sensitive device, with relatively low
Become originally to detect variations in temperature.
On the one hand, a kind of RFID label tag with temperature sensitive device, the chip of described RFID label tag are embodiments provided
On have two pins；Described temperature sensitive device is connected with the two pin, and forms knot in parallel with the antenna of described RFID label tag
Structure, the change of ambient temperature can cause the change of the resistance of temperature sensitive device own, at the core of described temperature sensitive device Yu RFID label tag
Having a logic circuit controlling break-make on the circuit that sheet connects, the circuit of this connection is chip with the logic circuit of control break-make
A part, whether the break-make of logic circuit determines temperature sensitive device with sky line parallel: when logic circuit disconnects, temperature sensitive dress
Put not with sky line parallel, after being now placed on certain temperature levels lower a period of time, the first resonant frequency of antenna and letter
Number intensity keeps constant；When logic circuit is connected, temperature sensitive device and sky line parallel, now it is placed on certain temperature water
After flat lower a period of time, the characteristic frequency of antenna and signal intensity at least have one and change, and now Antenna Operation is the
Under two resonant frequencies；What described RFID tag RFID reader sent instructs the break-make with control logic circuit, from
And realize by comparing the change detecting temperature from the difference between the signal intensity of the different frequency of antenna.
Optionally, in an embodiment of the present invention, the antenna of described RFID label tag is monopole antenna.
Optionally, in an embodiment of the present invention, the antenna of described RFID label tag is double-doublet antenna: described temperature sensitive device
Parallel-connection structure is formed with wherein antenna；Or described temperature sensitive device and two antennas concurrently form parallel-connection structure.
Optionally, in an embodiment of the present invention, described temperature sensitive device is the temperature sensitive device of resistor-type, and described temperature sensitive device includes:
The temperature sensitive device of critesistor, the temperature sensitive device of double-metal sheet type, the temperature sensitive device of condenser type.
On the other hand, a kind of RFID label tag with temperature sensitive device, the core of described RFID label tag are embodiments provided
A pin is had on sheet；One end of described temperature sensitive device is connected with this pin, and the other end is connected to described RFID label tag
On antenna, and forming parallel-connection structure with antenna, the change of ambient temperature can cause the change of the resistance of temperature sensitive device own, in institute
State and on the circuit that temperature sensitive device is connected with the chip of RFID label tag, have a logic circuit controlling break-make, the circuit of this connection
Being a part for chip with the logic circuit controlling break-make, the break-make of logic circuit determines temperature sensitive device with antenna the most also
Connection: when logic circuit disconnects, temperature sensitive device not with sky line parallel, when being now placed on certain temperature levels next section
After between, the first resonant frequency of antenna and signal intensity keep constant；When logic circuit is connected, temperature sensitive device is with antenna also
Connection, after being now placed on certain temperature levels lower a period of time, the characteristic frequency of antenna and signal intensity at least have one
Individual changing, now Antenna Operation is under the second resonant frequency；Described RFID tag RFID reader sends
Instruct the break-make with control logic circuit, thus realize by comparing from the difference between the signal intensity of the different frequency of antenna
The different change detecting temperature.
Optionally, in an embodiment of the present invention, the antenna of described RFID label tag is monopole antenna.
Optionally, in an embodiment of the present invention, the antenna of described RFID label tag is double-doublet antenna: described temperature sensitive device
Parallel-connection structure is formed with wherein antenna；Or described temperature sensitive device and two antennas concurrently form parallel-connection structure.
Optionally, in an embodiment of the present invention, described temperature sensitive device is the temperature sensitive device of resistor-type, the temperature sensitive dress of described resistor-type
Put and include: the temperature sensitive device of critesistor, the temperature sensitive device of double-metal sheet type, the temperature sensitive device of condenser type.
Another aspect, embodiments provides a kind of RFID label tag with temperature sensitive device, and described temperature sensitive device is connected to
On the antenna of described RFID label tag, and forming parallel-connection structure with antenna, the change of ambient temperature can cause temperature sensitive device itself
The change of resistance, has a logic circuit controlling break-make with antenna on the circuit that described temperature sensitive device is connected, this connection
Circuit is the part of chip with the logic circuit controlling break-make, the break-make of logic circuit determine temperature sensitive device whether with antenna
In parallel: when logic circuit disconnects, temperature sensitive device not with sky line parallel, be now placed on next section of certain temperature levels
After time, the first resonant frequency of antenna and signal intensity keep constant；When logic circuit is connected, temperature sensitive device and antenna
Parallel connection, after being now placed on certain temperature levels lower a period of time, characteristic frequency and the signal intensity of antenna at least have
One changes, and now Antenna Operation is under the second resonant frequency；Described RFID tag RFID reader sends
Instruction with the break-make of control logic circuit, thus realize by comparing between the signal intensity of the different frequency of antenna
Difference detects the change of temperature.
Optionally, in an embodiment of the present invention, the antenna of described RFID label tag is monopole antenna.
Optionally, in an embodiment of the present invention, the antenna of described RFID label tag is double-doublet antenna: described temperature sensitive device
Parallel-connection structure is formed with wherein antenna；Or described temperature sensitive device and two antennas concurrently form parallel-connection structure.
Optionally, in an embodiment of the present invention, described temperature sensitive device is the temperature sensitive device of resistor-type, the temperature sensitive dress of described resistor-type
Put and include: the temperature sensitive device of critesistor, the temperature sensitive device of double-metal sheet type, the temperature sensitive device of condenser type.
Another further aspect, embodiments provides a kind of rfid system with temperature sensitive device, and described rfid system includes
RFID label tag and RFID reader, described RFID label tag includes the RFID label tag of the temperature sensitive device of above-mentioned band；Described RFID
Reader sends the instruction break-make with the logic circuit of control RFID label tag, thus by comparing the different frequency from antenna
Signal intensity between difference detect the change of temperature.
Another further aspect, embodiments provides the temperature checking method of a kind of rfid system with temperature sensitive device, described
Temperature checking method is applied to the rfid system of the temperature sensitive device of above-mentioned band, including: sent by described RFID reader and refer to
Order is to control the break-make of the logic circuit of RFID label tag；The instruction sent by RFID tag RFID reader is with control
The break-make of logic circuit processed: when logic circuit disconnects, temperature sensitive device not with sky line parallel, be now placed on certain
Under temperature strength, the first resonant frequency of antenna and signal intensity keep constant；When logic circuit is connected, temperature sensitive device with
It line parallel, is now placed under certain temperature strength, and the characteristic frequency of antenna and signal intensity at least have one
Changing, now Antenna Operation is under the second resonant frequency；Described RFID reader is utilized to compare the difference from antenna
Difference between the signal intensity of frequency detects the change of temperature.
Technique scheme has the advantages that because using temperature sensitive device to form knot in parallel with the antenna of RFID label tag
Structure, has a logic circuit controlling break-make with the chip of RFID label tag on the circuit that temperature sensitive device is connected, this connection
Circuit is the part of chip with the logic circuit controlling break-make: when logic circuit disconnects, temperature sensitive device not with sky line parallel,
After being now placed on certain temperature levels lower a period of time, the first resonant frequency of antenna and signal intensity keep constant；
When logic circuit is connected, temperature sensitive device and sky line parallel, after being now placed on certain temperature levels lower a period of time,
Now Antenna Operation is under the second resonant frequency；The instruction that RFID tag RFID reader sends is with control logic circuit
Break-make, thus realize by comparing the change detecting temperature from the difference between the signal intensity of the different frequency of antenna
Technological means, so having reached to detect at lower cost the technique effect of variations in temperature, and utilize the energy that RFID obtains
Amount, solves the powerup issue of temperature detection.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing skill
In art description, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to root
Other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram that the temperature sensitive device of the embodiment of the present invention is connected with RFID label chip；
Fig. 2 is the equivalent circuit diagram of RFID label chip inside antenna；
Fig. 3 is that the temperature sensitive device of the embodiment of the present invention, logic switch are connected with RFID label chip inside antenna equivalent circuit
Schematic diagram；
Fig. 4 is that the temperature sensitive device of the embodiment of the present invention is joined directly together, with RFID label antenna, the schematic diagram connect；
Fig. 5 .1-Fig. 5 .2 is the structure explanatory diagram of the temperature sensitive device of the embodiment of the present invention；
Fig. 6 is the flow chart of embodiment of the present invention temperature levels based on signal intensity detection method.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly and completely
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on this
Embodiment in invention, the every other reality that those of ordinary skill in the art are obtained under not making creative work premise
Execute example, broadly fall into the scope of protection of the invention.
The temperature sensitive device of the embodiment of the present invention is connected with the chip of RFID label tag and at least there are three kinds of situations:
Two pins structure:
The embodiment of the present invention is a kind of for detecting the device of variations in temperature, system and technology.This system contains one
RFID label tag, the chip of this RFID label tag has two pins.Temperature sensitive device is connected with the two pin, with dwi hastasana
Become parallel-connection structure.The change of ambient temperature can cause the change of the resistance of temperature sensitive device own.At the circuit that pin is connected with chip
On have a logic circuit controlling break-make, the circuit of this connection is the part of chip with the logic circuit controlling break-make.Patrol
The break-make of volume circuit determine temperature sensitive device whether with sky line parallel.
When logic circuit disconnects, temperature sensitive device not with sky line parallel, when being now placed on certain temperature levels next section
After between, the first resonant frequency of antenna and signal intensity keep constant.When logic circuit is connected, temperature sensitive device is with antenna also
Connection, after being now placed on certain temperature levels lower a period of time, the characteristic frequency of antenna and signal intensity at least have one
Individual changing, now Antenna Operation is under the second resonant frequency.RFID reader can send instruction control to label and patrol
Collect the break-make of circuit, when logic circuit is connected, can be by comparing between the signal intensity of the different frequency of antenna
Difference detects the change of temperature.
For an example, this system contains a RFID label tag, an only antenna on this label.This
Two pins are had on the chip of label.Temperature sensitive device is connected with the two pin, forms parallel-connection structure with this root antenna.Drawing
A logic circuit controlling break-make is had with chip, the circuit of this connection and the logic electricity of control break-make on the circuit that foot is connected
Road is a part for chip.The change of ambient temperature can cause the change of the resistance of temperature sensitive device own.
After being placed on certain temperature levels lower a period of time when logic circuit is connected, characteristic frequency and the signal of antenna are strong
Degree at least has one and changes, and now Antenna Operation is under the second resonant frequency.RFID reader can be sent out to label
Send instruction, and changing of temperature can be detected by the difference between the signal intensity of different frequency during CL Compare Logic connecting and disconnecting of the circuit
Become.More precisely, temperature sensitive device should have relatively low resistance, its instantiation includes: the temperature sensitive device of critesistor,
The temperature sensitive device of double-metal sheet type, the temperature sensitive device of condenser type etc..
For another example, this system contains a RFID label tag, and this label has two antennas.Now
There are two kinds of situations.The first situation is that temperature sensitive device is connected with the two pin, forms parallel-connection structure with first antenna.?
A logic circuit controlling break-make is had with chip, the circuit of this connection and the logic of control break-make on the circuit that pin is connected
Circuit is a part for chip.The change of ambient temperature can cause the change of the resistance of temperature sensitive device own.And second antenna begins
Eventually with the first resonant frequency proper communication.
When logic circuit is connected, after being placed on certain temperature levels lower a period of time, the characteristic frequency of first antenna
Changing with a signal intensity at least meeting, it is operated under the second resonant frequency.RFID reader can give label
Send instruction, and by CL Compare Logic circuit ON time first and second antennas different frequency signal intensity between difference
The different change that can detect temperature.Signal by the different frequency during logic circuit break-make that compares second antenna self is strong
Difference between degree can also detect the change of temperature.
The second situation is, temperature sensitive device is connected with the two pin, concurrently forms parallel-connection structure with two antennas.At pin
A logic circuit controlling break-make is had, the circuit of this connection and the logic circuit of control break-make on the circuit being connected with chip
It it is a part for chip.The change of ambient temperature can cause the change of the resistance of temperature sensitive device own.This only contains a sky with label
The situation of line is similar to.
After being placed on certain temperature levels lower a period of time when logic circuit is connected, antenna features frequency and signal intensity
At least having one to change, it is operated under the second resonant frequency.RFID reader can send instruction to label,
And the change of temperature can be detected by the difference between the signal intensity of different frequency during CL Compare Logic connecting and disconnecting of the circuit.First
Planting situation circuit and connect fairly simple, during work, the resonant frequency of two antennas may be different, can affect the precision of measurement.The
Two kinds of situation circuit connect more complicated, but during work, the resonant frequency of two antennas is consistent, and certainty of measurement is higher.More precisely
Ground is said, temperature sensitive device should have relatively low resistance, and its instantiation includes: the temperature sensitive device of critesistor, double-metal sheet type
Temperature sensitive device, the temperature sensitive device of condenser type etc..
One pin configuration:
The chip of this label can only have a pin, and this pin outwards one end with temperature sensitive device is connected, temperature sensitive device
The other end be attached directly on antenna.Pin is similar at the junction point of chip internal and the situation of two pins, finally remains
Reach and the purpose of sky line parallel.There is one to control patrolling of break-make on the circuit that pin is connected with chip internal circuits simultaneously
Collect circuit.When logic circuit disconnects, temperature sensitive device not with sky line parallel, be now placed on certain temperature levels next
After the section time, the first resonant frequency of antenna and signal intensity keep constant.
When logic circuit is connected, temperature sensitive device and sky line parallel, now it is placed on certain temperature levels lower a period of time
After, antenna features frequency and signal intensity at least have one and change, and it is operated under the second resonant frequency.RFID
Reader can to label send instruction control logic circuit break-make, when logic circuit is connected, can pass through compare from
Difference between the signal intensity of the different frequency of antenna detects the change of temperature.
For an example, this system contains a RFID label tag, an only antenna on this label.This
A pin is had on the chip of label.Temperature sensitive device is connected with this pin, and the temperature sensitive device other end is attached directly on antenna,
Parallel-connection structure is formed with antenna.The circuit that pin is connected with chip has a logic circuit controlling break-make, this connection
The logic circuit of circuit and control break-make is a part for chip.The change of ambient temperature can cause the resistance of temperature sensitive device own
Change.
After being placed on certain temperature levels lower a period of time when logic circuit is connected, Antenna Operation is at the second resonant frequency
Under, its characteristic frequency and signal intensity at least have one and change.RFID reader can send instruction to label,
And the change of temperature can be detected by the difference between the signal intensity of different frequency during CL Compare Logic connecting and disconnecting of the circuit.More true
Saying with cutting, temperature sensitive device should have relatively low resistance, and its instantiation includes: the temperature sensitive device of critesistor, bimetal leaf
The temperature sensitive device of formula, the temperature sensitive device of condenser type etc..
For another example, this system contains a RFID label tag, and this label has two antennas.Label
Chip on have a pin.Temperature sensitive device is connected with this pin, and the temperature sensitive device other end is attached directly on antenna, with
First antenna forms parallel-connection structure.Having a logic circuit controlling break-make with chip on the circuit that pin is connected, this is even
The circuit connect and the logic circuit controlling break-make are parts for chip.The change of ambient temperature can cause temperature sensitive device itself
The change of resistance.And second antenna is all the time with the first resonant frequency communication.
When logic circuit is connected, after being placed on certain temperature levels lower a period of time, first Antenna Operation is second
Under resonant frequency, at least meeting of its characteristic frequency and signal intensity changes.RFID reader can be sent out to label
Send instruction, and by difference between the signal intensity of the different frequency of first and second antennas during CL Compare Logic circuit ON
The change of temperature can be detected.Signal intensity by the different frequency during logic circuit break-make that compares first antenna self
Between difference can also detect the change of temperature.More precisely, temperature sensitive device should have relatively low resistance, it concrete
Example includes: the temperature sensitive device of critesistor, the temperature sensitive device of double-metal sheet type, the temperature sensitive device of condenser type etc..
Without pin configuration:
When not having pin on the chip of RFID label tag, temperature sensitive device can be attached directly on antenna.In this case, with
The antenna that temperature sensitive device is connected can not depart from temperature sensitive device and with normal frequency for communication.When being placed on certain temperature levels
After lower a period of time, the characteristic frequency of antenna and signal intensity at least have one and change.RFID reader can be given
Label apparatus sends instruction, detects changing of temperature by comparing from the difference between the signal intensity of the different frequency of antenna
Become.
For an example, this system contains a RFID label tag, and this label has two antennas.Temperature sensitive dress
Put and be directly connected with first antenna, and second antenna is not connected with temperature sensitive device all the time with the first positive normal open of resonant frequency
Letter.After being placed on certain temperature levels lower a period of time, first Antenna Operation is under the second resonant frequency, and it is special
Levy frequency and a signal intensity at least meeting changes, and the characteristic frequency of second antenna and signal intensity are constant.
RFID reader can send instruction to label, and by comparing the signal intensity of the different frequency of first and second antennas
Between difference can detect the change of temperature.More precisely, temperature sensitive device should have relatively low resistance, its concrete reality
Example includes: the temperature sensitive device of critesistor, the temperature sensitive device of double-metal sheet type, the temperature sensitive device of condenser type etc..
In the same way, the chip of antenna can also can carry one can also carry multiple pin without pin by band.My god
The radical of line can be one, two the most.One or more temperature sensitive device can also be connected accordingly, simultaneously
The model of temperature sensitive device can be the same or different.For a kind of instantiation of device, when being placed on certain temperature
After degree level lower a period of time, at least meeting of the characteristic frequency of the antenna being connected with temperature sensitive device and signal intensity changes
Become.RFID reader can to label apparatus send instruction, by compare the different frequency from antenna signal intensity it
Between difference detect the change of temperature.
For the instantiation of a kind of temperature sensitive device, simultaneous compares the method for numerical value and includes these compare numerical value and majority
Signal strength values compares.These signal strength values belong to different frequencies, and are associated, simultaneously with most temperature values
The level of temperature can be detected based on comparison mentioned above.
But, for another aspect, a rfid system includes that a RFID label tag device and a RFID read
Device device.This RFID label tag device is used to send two kinds of signals, signal when the most above-mentioned logic circuit disconnects and logic
Signal during circuit ON, the request being subject to is responded by a kind of meeting of both signals.RFID reader device
It is used for RFID label tag device is at least sent a request.Installing reading device is to accept the logic circuit from label
The fiducial value between signal strength values when signal strength values during connection and logic circuit disconnect, and these fiducial values are converted
Varying level for temperature.
In an example, the antenna of RFID label tag is connected with temperature sensitive device, has one to control logical on this connection line
Disconnected logic circuit.In the case of logic circuit break-make whether two kinds, have corresponding two kinds of different frequencies from antenna
Rate.After logic circuit is connected and this label apparatus is positioned over certain temperature levels lower a period of time, due to resonance frequency
The change of rate, will produce the intensity level of unlike signal.
In an example, RFID label tag device includes first, second two antennas.Preferably, first sky
Line is connected with temperature sensitive device, after this label apparatus is placed on certain temperature levels lower a period of time, due to resonance frequency
The change of rate, will produce the different of secondary signal intensity level and the first signal strength values.
Another further aspect, embodiments provides a kind of rfid system with temperature sensitive device, and described rfid system includes
RFID label tag and RFID reader, described RFID label tag includes the RFID label tag of the temperature sensitive device of above-mentioned band；Described RFID
Reader sends the instruction break-make with the logic circuit of control RFID label tag, thus by comparing the different frequency from antenna
Signal intensity between difference detect the change of temperature.
Another further aspect, embodiments provides the temperature checking method of a kind of rfid system with temperature sensitive device, described
Temperature checking method is applied to the rfid system of the temperature sensitive device of above-mentioned band, including: sent by described RFID reader and refer to
Order is to control the break-make of the logic circuit of RFID label tag；The instruction sent by RFID tag RFID reader is with control
The break-make of logic circuit processed: when logic circuit disconnects, temperature sensitive device not with sky line parallel, be now placed on certain
Under temperature strength, the first resonant frequency of antenna and signal intensity keep constant；When logic circuit is connected, temperature sensitive device with
It line parallel, is now placed under certain temperature strength, and the characteristic frequency of antenna and signal intensity at least have one
Changing, now Antenna Operation is under the second resonant frequency；Described RFID reader is utilized to compare the difference from antenna
Difference between the signal intensity of frequency detects the change of temperature.
As it is shown in figure 1, the signal of the temperature-sensitive label 10 being connected with RFID label chip for the temperature sensitive device of the embodiment of the present invention
Figure.In Fig. 1, label apparatus 10, including a base 15, a surface-mounted integrated circuit 13, two pins 16,17 and
Individual double-doublet antenna 11,12.Have two pins 16,17 on surface-mounted integrated circuit 13, the two pin outwards with temperature sensitive device
14 are connected, and the two pin is in parallel with the equivalent circuit of antenna at chip internal, and have one to control logical on the circuit connected
Disconnected logic circuit.Can control whether temperature sensitive module is access in chip circuit by the break-make of logic circuit, such that it is able to
The frequency of the antenna that impact is connected with radio-frequency module.When logic circuit disconnects, label antenna is with the first resonant frequency communication.
When logic circuit is connected, after being placed on certain temperature levels lower a period of time, Antenna Operation under the second resonant frequency,
Its characteristic frequency and signal intensity at least have one and change.
In an example, transmitting terminal 11,12 are made up of one or more different low electrical resistant materials, and these materials have higher
Electric conductivity, such as copper, silver, and aluminum, they and temperature sensitive device mentioned above are by two pins 16,17 and antenna
11,12 are connected, and when antenna 11, after 12 are placed on certain temperature levels lower a period of time, temperature sensitive device can cause one
Individual or the change of multiple transmitting terminal generation resonant frequency.The frequency of this change is the most different with the frequency of reception and transmission.Example
As, after temperature sensitive device is positioned over certain temperature levels lower a period of time, may result in transmission frequency and accept in frequency at least
One changes.
In another example, the antenna frequencies value set at the beginning will be above the antenna frequencies under uniform temperature environment, then
When reaching certain temperature, it will reduce.In another example, the antenna frequencies set at the beginning is less than a constant temperature
Antenna frequencies under degree level, when reaching certain temperature levels, it will rise.Can be used for the such temperature sensitive of the present invention
Device has: the temperature sensitive device of critesistor, the temperature sensitive device of double-metal sheet type, the temperature sensitive device of condenser type etc..
Type based on temperature sensitive device is different, causes the temperature levels of change to be probably a specific temperature value and is also likely to be one
The scope of individual selectively temperature value.The length of time necessarily causes the change of antenna resonance frequency, and antenna quality also can be led
Cause different changes.Such as, on antenna with the type of temperature sensitive device can affect change antenna resonance frequency required time
Length.
As in figure 2 it is shown, be the equivalent circuit diagram of RFID label antenna.When tag coil antenna enters the friendship that read write line produces
In varying magnetic field, the interaction between label antenna and reading and writing device antenna is similar to transformator.Both coils are equivalent to become
The primary coil of depressor and secondary coil.The resonant tank formed by label antenna is as in figure 2 it is shown, include the line of label antenna
Circle inductance (L), parasitic capacitance (Cp) and shunt capacitance (C2), its resonant frequency is
In formula, C is Cp
And C2Parallel equivalent electric capacity, R1, R2For circuit internal inductance coil and the equivalent resistance of other devices.Label and read write line
The carrier frequency that two-way communication uses is exactly f.When requiring that tag antenna coil profile is the least, i.e. area is little, and needs certain
Operating distance, the aerial coil mutual induction amount that RFID label tag and read write line are asked the most substantially can not meet actual demand, can be at mark
Signing the internal insertion of aerial coil and have the Ferrite Material of high permeability, to increase mutual induction amount, thus bucking coil cross section is little
Problem.
As it is shown on figure 3, be the temperature sensitive device of the embodiment of the present invention, the logic circuit controlling break-make and RFID label antenna equivalence
The schematic diagram that circuit is connected.The resonant tank that formed by label antenna as it can be seen, include the coil inductance (L) of label antenna,
Parasitic capacitance (Cp) and shunt capacitance (C2), its resonant frequency is
Formula C is CpAnd C2Parallel connection
Equivalent capacity, R1, R2For circuit internal inductance coil and the equivalent resistance of other devices.M be represent temperature sensitive device can power transformation
Resistance, S is the logic circuit controlling break-make.When logic circuit disconnects, temperature sensitive device not with sky line parallel, be now placed
Under certain temperature levels after a period of time, the first resonant frequency of antenna and signal intensity keep constant.Work as logic circuit
During connection, temperature sensitive device and sky line parallel, after being now placed on certain temperature levels lower a period of time, Antenna Operation exists
Under second resonant frequency, its characteristic frequency and signal intensity at least have one and change.
As shown in Figure 4, the sketch of the passive RFID tags device 40 of variations in temperature can be detected for the embodiment of the present invention.Such as figure
Shown in 4, label apparatus 40 includes a base 45, an integrated circuit 43 and a double-doublet antenna 41,42.With sky
The temperature sensitive device 44 that line 42 is connected will affect the resistance of antenna 42.The material that temperature sensitive device 44 is suitable for can be according to sky
Line 41, the current voltage of any in 42 controls any one frequency both pinpointed.For an example, peace
Dress antenna 41,42 can make it produce resonance in identical frequency.For another example, installing antenna 41,42 can
So that it produces resonance in different frequencies.
In an example, transmitting terminal double-doublet antenna 41,42 is made up of one or more different low electrical resistant materials, this
A little materials have higher electric conductivity, such as copper, silver, and aluminum, and they are connected with temperature sensitive device mentioned above, when antenna 41,
After 42 are placed on certain temperature levels lower a period of time, temperature sensitive device can cause one or more transmitting terminal that resonance frequency occurs
The change of rate, thus cause a different frequency.The change of this frequency is the most different with the frequency received and send.Example
As, after temperature sensitive device is positioned over certain temperature levels lower a period of time, may result in transmission frequency and accept in frequency at least
One changes.
In another example, the antenna frequencies value set at the beginning will be above the antenna frequencies under uniform temperature environment, then
When reaching certain temperature, it will reduce.In another example, the antenna frequencies set at the beginning is less than a constant temperature
The temperature sensitive device of critesistor under degree level, the temperature sensitive device of double-metal sheet type, the temperature sensitive device of condenser type etc..
Type based on temperature sensitive device is different, causes the temperature levels of change to be probably a specific temperature value and is also likely to be one
The scope of individual selectively temperature value.The length of time necessarily causes the change of antenna resonance frequency, and antenna quality also can be led
Cause different changes.Such as, on antenna with the type of temperature sensitive device can affect change antenna resonance frequency required time
Length.
As shown in Fig. 5 .1, thermistor temperature sensor element is made up of critesistor 513 and electrode 511,512.Temperature-sensitive
Resistance is the sensing element that a kind of semi-conducting material 513 is made.Its operation principle is to utilize the body electricity of semi-conducting material 513
Temperature variable is converted into electricity by the physical characteristic that resistance varies with temperature and significantly changes.Thermal resistance has highly sensitive, volume
Little, make simple, life-span length, working stability, it is simple to realize the feature such as telemeasurement and control.
As shown in Fig. 5 .2, the temperature sensitive device of bimetal leaf is by bimetal leaf 521, bimetal leaf 522 and bonding place 523 structure
Become.Bimetal leaf is that 521,522, the two panels metal with different heat expansion coefficient is bonded together, and constitutes and such as schemes institute
The device shown.When bimetal leaf is by temperature more higher than tack temperature, it will bend toward the direction, when it is subject to
During than tack temperature lower temperature, it will bend towards another direction.
As shown in Figure 6, for the embodiment of the present invention by using the label apparatus of multiple antennas to detect a kind of method that temperature changes
Flow chart.Need it is contemplated that, device mentioned above uses a label integrated circuit to carry out and the friendship of multiple antennas
Stream.
As shown in Figure 6,50, RFID reader sends energy and instruction to label apparatus.52, logic circuit is when initial
Between be in the state of disconnection, label apparatus the antenna reception energy not being connected with temperature sensitive device and instruction.54, label apparatus
The electromagnetic wave carrying energy is converted into a DC(direct current) voltage, thus label just can be made to perform the requirement of instruction.And
This conversion needs to use an electric charge pump, a rectification circuit, or is connected with each other, or to use other energy
Amount reforming unit.56, label apparatus sends signal by the sky alignment reader not being connected with temperature sensitive device.58, reader
Measure and record the energy intensity receiving signal.60, reader sends the instruction connecting logic circuit to label apparatus.62,
The label apparatus antenna being connected with temperature sensitive device sends data.64, reader measurement receives the energy intensity of signal.66,
Reader calculated goes out the fiducial value of a reaction signal intensity.68, fiducial value is changed into different temperature values by reader.Just
For one example, reader can set a time period for receiving the signal of label, without receiving signal, reads
Signal intensity will be recorded as 0 by device.
In this system, reader using the signal strength values from the antenna not being connected with temperature sensitive device as a reference
Value, the signal strength values of the label antenna that it is connected with temperature sensitive device compares.By receive from temperature
The connected signal with the transmitting terminal not being connected with temperature sensitive device of quick device, reader can collect the ratio representing unlike signal intensity
Relatively it is worth.Then, RFID reader can be converted into the temperature levels residing for label such a fiducial value.Concrete with regard to one
Example for, configure this RFID reader be in order to the reference data stored by use by receive from connection
Or the difference being not connected to the RF signal intensity of the antenna of temperature sensitive device is converted into temperature value.
Best situation is, using be not connected to temperature sensitive device antenna as a reference, can by due to label and reader it
Between the change that caused of coupling filter out.Additionally, as previously mentioned, temperature sensitive device is applied to meeting in design
The time length making change and the label of its resistance value be placed under specified temp forms relation one to one.Such as,
Temperature sensitive device is only positioned on an antenna, the signal from RFID label tag device so can be allowed as one
Function changes within the specific limits, and the function that this function antenna just just has after being placed on the time under uniform temperature.
Ibid, the application of the invention, under conditions of RFID label tag is passive, RFID reader is able to detect that label apparatus is
No be placed at a temperature of certain and this temperature the most within the acceptable range.
The various RFID label tag not using two antennas also can perceive the change of temperature with temperature sensitive device, sense temperature
Change is also to be able to recognize antenna based on the change of resonant frequency on antenna to receive the change of signal.
Such as by the design to the antenna being connected with temperature sensitive device, it is possible to make the frequency of antenna at ISM(Industrial
Scientific Medical, industry, science, medical science) the interior change of frequency range, the label of standard can connect this and warm
The antenna that quick device and logic circuit are connected.
Such as in a concrete example, label antenna can so set, before being exposed in uniform temperature environment, and sky
The resonant frequency of line is 902-928MHZ, but label is once exposed in uniform temperature environment, due to the impact of temperature, sky
The resonant frequency of line just reduces to 899.5-927.5MHZ, divided at the frequency bins (902-928MHZ) of U.S. RFID
Being 52 channels, the channel that can not receive of skipping that reader can be random in these 52 channels goes, and reader is this
The benefit jumped can effectively prevent multiple reader from attempting to use same frequency institute in same physical space exactly
The conflict caused.
The most in one example, RFID frequency range (902-928MHZ) is not divided into 52 channels but averagely divides
The antenna settings having become n channel tag is operated under this frequency range (902-928MHZ).Due to label antenna and temperature
Quick device is connected, as long as so temperature has exceeded the scope of value set in advance, the operating frequency of antenna tag antenna just declines
Among (899.5-927.5MHZ) this frequency range.Therefore compared with original frequency range just by channel n from frequency range model
Enclosing middle eliminating to go, therefore the frequency range (899.5-927.5MHZ) after change just no longer allows label and channel n to carry out information
Exchange.
In concrete example, if the environment at label place has exceeded intended temperature range, reader can only pass through channel
1 to n-1 sends instruction to label, and label also can be made a response, because the antenna in label just can only be in this frequency range
Interior work, when reader sends instruction with the frequency of n channel to label, because the change of label temperature already leads to label
The resonant frequency of antenna has descended to 899.5-927.5MHZ and no longer reaches 928MHZ so label is the most no longer made a response,
Transmit information back to reader.
Favourable aspect is that the change of the operating frequency of antenna caused beyond value set in advance due to temperature is just by this letter
Cease the disappearance of exchange and reflect.
In a model, reader can further confirm that to label one instruction between channel n-1 and channel n of transmission
Once the operating frequency range of label antenna has occurred that drift, is sent by channel n-1 because label can receive
Instruction, and can by channel n-1 can be to reader feedback information because label can not receive by channel n
The instruction sent, and can not thus determine the work of label antenna to reader feedback information by channel n
Working frequency scope has occurred that drift.
The change of temperature causes the operating frequency of label antenna to occur drift up and down and current invention not to limit
Frequency range is averagely being divided into n channel by system.
The embodiment of the present invention can detect variations in temperature at lower cost, and utilizes the energy that RFID obtains, and solves temperature
The powerup issue of detection.
The enforcement of each feature of this system may relate to software, and hardware is likely to relate to the combination ability of software and hardware
Reaching, the enforcement of many advantages of such as system is by programming a kind of high-caliber process and OO programming language
Realize with the mode mutually exchanged of computer and other equipment machines.Each such function program may be stored in one
Individual storage intermediary is read by a computer and processor in such as read only memory and realizes above-mentioned function.
Those skilled in the art are it will also be appreciated that the various illustrative components, blocks (illustrative that list of the embodiment of the present invention
Logical block), unit, and step can pass through electronic hardware, computer software, or both combinations realize.For
Clearly show that the replaceability (interchangeability) of hardware and software, above-mentioned various illustrative components (illustrative
Components), unit and step the most universally describe their function.Such function is by hardware or soft
Part realizes depending on specifically applying the design requirement with whole system.Those skilled in the art can be specific for every kind
Application, it is possible to use the function described in the realization of various methods, but this realization is understood not to protect beyond the embodiment of the present invention
The scope protected.
Various illustrative logical block described in the embodiment of the present invention, or unit can pass through general processor, numeral
Signal processor, special IC (ASIC), field programmable gate array (FPGA) or other FPGA dress
Put, discrete gate or transistor logic, discrete hardware components, or the design of any of the above described combination realizes or operates described
Function.General processor can be microprocessor, alternatively, this general processor can also be any traditional processor,
Controller, microcontroller or state machine.Processor can also realize, such as at digital signal by calculating the combination of device
Reason device and microprocessor, multi-microprocessor, one or more microprocessors one Digital Signal Processor Core of associating, or appoint
What its similar configuration realizes.
Method or the step of algorithm described in the embodiment of the present invention can be directly embedded into hardware, the software mould of processor execution
Block or the combination of both.Software module can be stored in RAM memory, flash memory, ROM memory, EPROM
In memorizer, eeprom memory, depositor, hard disk, moveable magnetic disc, CD-ROM or this area, other is any
In the storage medium of form.Exemplarily, storage medium can be connected with processor, so that processor can be from storage matchmaker
Jie reads information, it is possible to deposit write information to storage medium.Alternatively, storage medium can also be integrated in processor.
Processor and storage medium can be arranged in ASIC, and ASIC can be arranged in user terminal.Alternatively, processor and
Storage medium can also be arranged in the different parts in user terminal.
In one or more exemplary designs, the above-mentioned functions described by the embodiment of the present invention can hardware, software,
The combination in any of firmware or this three realizes.If realized in software, these functions can store the matchmaker with computer-readable
On Jie, or it is transmitted on the medium of computer-readable with one or more instructions or code form.Computer readable medium includes computer
Store medium and be easy to so that allowing computer program transfer to the telecommunication media in other place from a place.Storage medium can be
Any general or special computer can be with the useable medium of access.Such as, such computer readable media can include but not
It is limited to RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage device,
Other any may be used for carrying or storage with instruction or data structure and other can by general or special computer or general or
Special processor reads the medium of the program code of form.Additionally, any connection can be properly termed computer-readable
Medium, such as, if software is by coaxial cable, a light from a web-site, server or other remote resource
Fine computer, twisted-pair feeder, Digital Subscriber Line (DSL) or with the wireless way for transmittings such as the most infrared, wireless and microwave also by
It is included in defined computer readable medium.Described video disc (disk) and disk (disc) include Zip disk, radium-shine
Dish, CD, DVD, floppy disk and Blu-ray Disc, disk is generally with magnetic duplication data, and video disc generally carries out light with laser
Learn and replicate data.Combinations of the above can also be included in computer readable medium.
Above-described detailed description of the invention, has been carried out the purpose of the present invention, technical scheme and beneficial effect the most in detail
Illustrate, be it should be understood that the detailed description of the invention that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, all should wrap
Within being contained in protection scope of the present invention.
Claims (6)
1. the RFID label tag with temperature sensitive device, it is characterised in that have two pins on the chip of described RFID label tag；
Described temperature sensitive device is connected with the two pin, and forms parallel-connection structure with the antenna of described RFID label tag, ambient temperature
Change can cause the change of the resistance of temperature sensitive device own, on the circuit that described temperature sensitive device is connected with the chip of RFID label tag
There are a logic circuit controlling break-make, the circuit of this connection and the part that the logic circuit controlling break-make is chip, logic
Whether the break-make of circuit determines temperature sensitive device with sky line parallel: when logic circuit disconnects, temperature sensitive device not with sky line parallel,
After being now placed on certain temperature levels lower a period of time, the first resonant frequency of antenna and signal intensity keep constant；
When logic circuit is connected, temperature sensitive device and sky line parallel, after being now placed on certain temperature levels lower a period of time,
The characteristic frequency of antenna and signal intensity at least have one and change, and now Antenna Operation is under the second resonant frequency；Institute
State the instruction break-make with control logic circuit of RFID tag RFID reader transmission, thus realize by relatively coming
Difference between the signal intensity of the different frequency of antenna detects the change of temperature, wherein, the sky of described RFID label tag
Line is double-doublet antenna, and described temperature sensitive device is the temperature sensitive device of resistor-type；
Wherein, described RFID label tag having two antennas, described temperature sensitive device only forms parallel-connection structure with first antenna,
Second antenna is all the time with described first resonant frequency proper communication, and described RFID reader is by relatively described first sky
The change of the Difference test temperature between the signal intensity of the different frequency during logic circuit break-make of line self, or, pass through
Difference test temperature between the signal intensity of the different frequency of first antenna and second antenna during CL Compare Logic circuit ON
The change of degree；
Wherein, when the antenna of described RFID label tag enters in the alternating magnetic field that RFID reader produces, described RFID marks
Forming transformator between antenna and the antenna of RFID reader signed, with thinking that temperature sensitive device provides energy source, RFID marks
The antenna signed and the antenna of RFID reader are respectively primary coil and the secondary coil of transformator；In described RFID label tag
Inner antenna insert high permeability Ferrite Material.
2. the RFID label tag with temperature sensitive device as claimed in claim 1, it is characterised in that described temperature sensitive device is resistance
The temperature sensitive device of type, described temperature sensitive device includes: the temperature sensitive device of critesistor, the temperature sensitive device of double-metal sheet type.
3. the RFID label tag with temperature sensitive device, it is characterised in that have a pin on the chip of described RFID label tag；
One end of described temperature sensitive device is connected with this pin, and the other end is connected on the antenna of described RFID label tag, and and antenna
Forming parallel-connection structure, the change of ambient temperature can cause the change of the resistance of temperature sensitive device own, at described temperature sensitive device and RFID
A logic circuit controlling break-make, the circuit of this connection and the logic electricity controlling break-make is had on the circuit that the chip of label connects
Road is a part for chip, and whether the break-make of logic circuit determines temperature sensitive device with sky line parallel: when logic circuit disconnects,
Temperature sensitive device not with sky line parallel, after being now placed on certain temperature levels lower a period of time, antenna first resonance frequency
Rate and signal intensity keep constant；When logic circuit is connected, temperature sensitive device and sky line parallel, now it is placed on certain
After temperature levels lower a period of time, the characteristic frequency of antenna and signal intensity at least have one and change, now sky lineman
Make under the second resonant frequency；Instruction the leading to control logic circuit that described RFID tag RFID reader sends
Disconnected, thus realize by comparing the change detecting temperature from the difference between the signal intensity of the different frequency of antenna, its
In, the antenna of described RFID label tag is double-doublet antenna, and described temperature sensitive device is the temperature sensitive device of resistor-type；
Wherein, described RFID label tag having two antennas, described temperature sensitive device only forms parallel-connection structure with first antenna,
Second antenna is all the time with described first resonant frequency proper communication, and described RFID reader is by relatively described first sky
The change of the Difference test temperature between the signal intensity of the different frequency during logic circuit break-make of line self, or, pass through
Difference test temperature between the signal intensity of the different frequency of first antenna and second antenna during CL Compare Logic circuit ON
The change of degree；
Wherein, when the antenna of described RFID label tag enters in the alternating magnetic field that RFID reader produces, described RFID
Transformator is formed, with thinking that temperature sensitive device provides energy source, RFID between antenna and the antenna of RFID reader of label
The antenna of label and the antenna of RFID reader are respectively primary coil and the secondary coil of transformator；Mark at described RFID
The inner antenna signed inserts the Ferrite Material of high permeability.
4. the RFID label tag with temperature sensitive device as claimed in claim 3, it is characterised in that the temperature sensitive device of described resistor-type
Including: the temperature sensitive device of critesistor, the temperature sensitive device of double-metal sheet type.
5. the rfid system with temperature sensitive device, described rfid system includes RFID label tag and RFID reader,
It is characterized in that,
Described RFID label tag includes the RFID label tag described in claim 1 or 2 with temperature sensitive device, or claim 3 or
RFID label tag with temperature sensitive device described in 4；
Described RFID reader sends instruction to control the break-make of logic circuit of RFID label tag, thus by compare from
Difference between the signal intensity of the different frequency of antenna detects the change of temperature.
6. the temperature checking method of the rfid system with temperature sensitive device, it is characterised in that described temperature checking method
It is applied to the rfid system with temperature sensitive device described in claim 5, including:
Instruction is sent to control the break-make of the logic circuit of RFID label tag by described RFID reader；
The break-make with control logic circuit is instructed: when logic circuit breaks by what RFID tag RFID reader sent
When opening, temperature sensitive device not with sky line parallel, be now placed under certain temperature strength, the first resonant frequency of antenna
Keep constant with signal intensity；When logic circuit is connected, temperature sensitive device and sky line parallel, now it is placed on certain
Under temperature strength, the characteristic frequency of antenna and signal intensity at least have one and change, and now Antenna Operation is second altogether
Under vibration frequency；
Described RFID reader is utilized to compare from the difference between the signal intensity of the different frequency of antenna to detect temperature
Change.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210179496.4A CN102722746B (en) | 2012-06-01 | 2012-06-01 | A kind of RFID label tag, rfid system and temperature checking method with temperature sensitive device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210179496.4A CN102722746B (en) | 2012-06-01 | 2012-06-01 | A kind of RFID label tag, rfid system and temperature checking method with temperature sensitive device |
Publications (2)
| Publication Number | Publication Date |
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| CN102722746A CN102722746A (en) | 2012-10-10 |
| CN102722746B true CN102722746B (en) | 2016-09-21 |
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Families Citing this family (4)
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| CN103310269A (en) * | 2013-05-21 | 2013-09-18 | 无锡市富华科技有限责任公司 | Stomach-stored electronic tag with temperature measuring function |
| CN105424222A (en) * | 2015-11-01 | 2016-03-23 | 西安电子科技大学 | RFID technology based multi-target temperature state monitoring system and method |
| US10770780B2 (en) * | 2017-08-10 | 2020-09-08 | Microelectronics Technology, Inc. | Antenna apparatus and circuit board thereof |
| CN111122015A (en) * | 2020-01-02 | 2020-05-08 | 歌尔股份有限公司 | Temperature sensing device, temperature sensing test system and working method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7132946B2 (en) * | 2004-04-08 | 2006-11-07 | 3M Innovative Properties Company | Variable frequency radio frequency identification (RFID) tags |
| US8228172B2 (en) * | 2008-09-30 | 2012-07-24 | Motorola Solutions, Inc. | RFID tag device with temperature sensitive antenna |
| CN101383020B (en) * | 2008-10-14 | 2010-08-04 | 厦门大学 | Environment sensitive type passive electronic label |
| CN201594278U (en) * | 2010-01-28 | 2010-09-29 | 上海华申智能卡应用系统有限公司 | Radio frequency label with controllable read and write |
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