CN102722747B - A kind of with the RFID tag of temperature sensitive device, RFID system and temperature checking method - Google Patents
A kind of with the RFID tag of temperature sensitive device, RFID system and temperature checking method Download PDFInfo
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- CN102722747B CN102722747B CN201210179509.8A CN201210179509A CN102722747B CN 102722747 B CN102722747 B CN 102722747B CN 201210179509 A CN201210179509 A CN 201210179509A CN 102722747 B CN102722747 B CN 102722747B
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Abstract
The present invention provides a kind of with the RFID tag of temperature sensitive device, RFID system and temperature checking method, the antenna of temperature sensitive device and RFID tag forms parallel-connection structure, the circuit that temperature sensitive device is connected with the chip of RFID tag has a logic circuit controlling break-make and an electric piezo-resistive conversion equipment, the circuit of this connection, this logic circuit and this electricity piezo-resistive conversion equipment are parts for chip: when logic circuit disconnects, temperature sensitive device not with sky line parallel, now being placed at a certain temperature, the first resonant frequency of antenna and signal intensity remain unchanged；When logic circuit is connected, temperature sensitive device and sky line parallel, now it is placed at a certain temperature, 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 realizing 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(RadioFrequencyIdentification, RF identification) technical field, particularly relate to a kind of with the RFID tag of temperature sensitive device, RFID system and temperature checking method.
Background technology
In recent years, RFID system had become more prevalent.RFID system is mainly used in the identification to people and thing.In general, this system includes at least a RFID reader, and this RFID reader can be launched in a scope set and receive the radiofrequency signal from one or more RFID tag.This RFID tag is usually and is encapsulated, it is possible on one object, it includes one can carry out the microchip of communication for information with antenna to patch.This microchip is an integrated circuit in general, and it can be used to store and process information, modulation /demodulation radiofrequency signal, and can run other specific function.The antenna of RFID tag is used to receive and send radiofrequency signal, and is commonly available to a kind of special frequency.
In some equipment, when the temperature having been used to monitoring product local environment with the RFID system of temperature sensitive device has exceeded acceptable temperature.In general these equipment requirements induction installations to have a lasting energy source, is used for detecting the change of temperature, but this can increase the cost of equipment.It addition, some equipment requirements induction installations to be also connected with a comparator circuit, thus detecting the degree size of deviation reference voltage, this requirement considerably increases the cost of equipment.In a word, improving what RFID system was a need for, it requires to can be used to detect variations in temperature when not using lasting energy source or using the adjunct circuit of a kind of low cost.
Summary of the invention
The embodiment of the present invention provides a kind of with the RFID tag of temperature sensitive device, RFID system and temperature checking method, detects variations in temperature at lower cost.
On the one hand, embodiments provide a kind of RFID tag with temperature sensitive device, the chip of described RFID tag has two pins；Described temperature sensitive device is connected with the two pin, and form parallel-connection structure with the antenna of described RFID tag, the change of ambient temperature can cause the change of temperature sensitive device both end voltage or electric current, the circuit that described temperature sensitive device is connected with the chip of RFID tag has a logic circuit controlling break-make and an electric piezo-resistive conversion equipment, the circuit of this connection, this logic circuit and this electricity piezo-resistive conversion equipment are parts for chip, electricity piezo-resistive conversion equipment for converting the change of resistance to by the change of temperature sensitive device both end voltage or electric current, the break-make of logic circuit determine temperature sensitive device whether with sky line parallel: when logic circuit disconnects, temperature sensitive device not with sky line parallel, now it is placed at a certain temperature, first resonant frequency of antenna and signal intensity remain unchanged；When logic circuit is connected, temperature sensitive device and sky line parallel, now it is placed at a certain temperature, the characteristic frequency of antenna and signal intensity at least have one and change, and now Antenna Operation is under the second resonant frequency；The instruction that described RFID tag RFID reader sends is with the break-make of control logic circuit, thus realizing 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 tag is monopole antenna.
Optionally, in an embodiment of the present invention, the antenna of described RFID tag is double-doublet antenna: described temperature sensitive device and the electric piezo-resistive conversion equipment being connected with this temperature sensitive device form parallel-connection structure with a wherein antenna；Or described temperature sensitive device and the electric piezo-resistive conversion equipment and two antennas that are connected with this temperature sensitive device concurrently form parallel-connection structure.
Optionally, in an embodiment of the present invention, described electricity piezo-resistive conversion equipment includes: a variable voltage converts variable-resistance device or the equivalent circuit of a ditch type field effect transistor or field effect transistor to, and described temperature sensitive device includes: the temperature sensitive device of thermocouple, the temperature sensitive device of quasiconductor, PN junction brilliant temperature sensitive device, the temperature sensitive device of transistor, the temperature sensitive device of IGCT, integrated temperature sensitive device.
On the other hand, embodiments provide a kind of RFID tag with temperature sensitive device, the chip of described RFID tag has a pin；One end of described temperature sensitive device is connected with this pin, the other end is connected on the antenna of described RFID tag, and form parallel-connection structure with antenna, the change of ambient temperature can cause the change of temperature sensitive device both end voltage or electric current, the circuit that described temperature sensitive device is connected with the chip of RFID tag has a logic circuit controlling break-make and an electric piezo-resistive conversion equipment, the circuit of this connection, this logic circuit and this electricity piezo-resistive conversion equipment are parts for chip, electricity piezo-resistive conversion equipment for converting the change of resistance to by the change of temperature sensitive device both end voltage or electric current, the break-make of logic circuit determine temperature sensitive device whether with sky line parallel: when logic circuit disconnects, temperature sensitive device not with sky line parallel, now it is placed at a certain temperature, first resonant frequency of antenna and signal intensity remain unchanged；When logic circuit is connected, temperature sensitive device and sky line parallel, now it is placed at a certain temperature, the characteristic frequency of antenna and signal intensity at least have one and change, and now Antenna Operation is under the second resonant frequency；The instruction that described RFID tag RFID reader sends is with the break-make of control logic circuit, thus realizing 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 tag is monopole antenna.
Optionally, in an embodiment of the present invention, the antenna of described RFID tag is double-doublet antenna: described temperature sensitive device and the electric piezo-resistive conversion equipment being connected with this temperature sensitive device form parallel-connection structure with a wherein antenna；Or described temperature sensitive device and the electric piezo-resistive conversion equipment and two antennas that are connected with this temperature sensitive device concurrently form parallel-connection structure.
Optionally, in an embodiment of the present invention, described electricity piezo-resistive conversion equipment includes: a variable voltage converts variable-resistance device or the equivalent circuit of a ditch type field effect transistor or field effect transistor to, and described temperature sensitive device includes: the temperature sensitive device of thermocouple, the temperature sensitive device of quasiconductor, PN junction brilliant temperature sensitive device, the temperature sensitive device of transistor, the temperature sensitive device of IGCT, integrated temperature sensitive device.
Another aspect, embodiments provide a kind of RFID tag with temperature sensitive device, described temperature sensitive device is connected on the antenna of described RFID tag, and form parallel-connection structure with antenna, the change of ambient temperature can cause the change of temperature sensitive device both end voltage or electric current, the circuit that described temperature sensitive device is connected with antenna has a logic circuit controlling break-make and an electric piezo-resistive conversion equipment, the circuit of this connection, this logic circuit and this electricity piezo-resistive conversion equipment are parts for chip, electricity piezo-resistive conversion equipment for converting the change of resistance to by the change of temperature sensitive device both end voltage or electric current, the break-make of logic circuit determine temperature sensitive device whether with sky line parallel: when logic circuit disconnects, temperature sensitive device not with sky line parallel, now it is placed at a certain temperature, first resonant frequency of antenna and signal intensity remain unchanged；When logic circuit is connected, temperature sensitive device and sky line parallel, now it is placed at a certain temperature, the characteristic frequency of antenna and signal intensity at least have one and change, and now Antenna Operation is under the second resonant frequency；The instruction that described RFID tag RFID reader sends is with the break-make of control logic circuit, thus realizing 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 tag is monopole antenna.
Optionally, in an embodiment of the present invention, the antenna of described RFID tag is double-doublet antenna: described temperature sensitive device and the electric piezo-resistive conversion equipment being connected with this temperature sensitive device form parallel-connection structure with a wherein antenna；Or described temperature sensitive device and the electric piezo-resistive conversion equipment and two antennas that are connected with this temperature sensitive device concurrently form parallel-connection structure.
Optionally, in an embodiment of the present invention, described electricity piezo-resistive conversion equipment includes: a variable voltage converts variable-resistance device or the equivalent circuit of a ditch type field effect transistor or field effect transistor to, and described temperature sensitive device includes: the temperature sensitive device of thermocouple, the temperature sensitive device of quasiconductor, PN junction brilliant temperature sensitive device, the temperature sensitive device of transistor, the temperature sensitive device of IGCT, integrated temperature sensitive device.
Another aspect, embodiments provides a kind of RFID system with temperature sensitive device, and described RFID system includes RFID tag and RFID reader, and described RFID tag includes the above-mentioned RFID tag with temperature sensitive device；Described RFID reader sends instruction to control the break-make of the logic circuit of RFID tag, thereby through comparing from the difference between the signal intensity of the different frequency of antenna to detect the change of temperature.
Another further aspect, embodiments provide the temperature checking method of a kind of RFID system with temperature sensitive device, described temperature checking method is applied to the above-mentioned RFID system with temperature sensitive device, including: send instruction to control the break-make of the logic circuit of RFID tag by described RFID reader；The instruction sent by RFID tag RFID reader is with the break-make of control logic circuit: when logic circuit disconnects, temperature sensitive device not with sky line parallel, be now placed at a certain temperature, the first resonant frequency of antenna and signal intensity remain unchanged；When logic circuit is connected, temperature sensitive device and sky line parallel, now it is placed at a certain temperature, the characteristic frequency of antenna and signal intensity at least have one and change, and now Antenna Operation is under the second resonant frequency；Described RFID reader is utilized to compare from the difference between the signal intensity of the different frequency of antenna to detect the change of temperature.
Technique scheme has the advantages that because adopting the antenna formation parallel-connection structure of temperature sensitive device and RFID tag, the circuit that temperature sensitive device is connected with the chip of RFID tag has a logic circuit controlling break-make and an electric piezo-resistive conversion equipment, the circuit of this connection, this logic circuit and this electricity piezo-resistive conversion equipment are parts for chip: when logic circuit disconnects, temperature sensitive device not with sky line parallel, now being placed at a certain temperature, the first resonant frequency of antenna and signal intensity remain unchanged；When logic circuit is connected, temperature sensitive device and sky line parallel, now it is placed at a certain temperature, 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 realizing the technological means by comparing the change detecting temperature from the difference between the signal intensity of the different frequency of antenna, so having reached to detect at lower cost the technique effect of variations in temperature, and utilize the RFID energy obtained, solve 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, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing 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 the schematic diagram that the temperature sensitive device of the embodiment of the present invention, logic switch and electricity piezo-resistive conversion equipment are connected with RFID label chip inside antenna equivalent circuit；
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 explanation figure of the temperature sensitive device of the embodiment of the present invention；
Fig. 6 is the embodiment of the present invention flow chart based on the temperature checking method of signal intensity.
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 clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, 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 tag and at least there are three kinds of situations:
Two pins structure:
The present invention is a kind of for detecting the device of variations in temperature, system and technology.This system contains a label, and the chip of this label has two pins.Temperature sensitive device is connected with the two pin, forms parallel-connection structure with antenna.The change of ambient temperature can cause the change of temperature sensitive device both end voltage or electric current.Having a logic circuit controlling break-make and an electric piezo-resistive conversion equipment with chip on the circuit that pin is connected, the circuit of this connection, the logic circuit controlling break-make and electricity piezo-resistive conversion equipment are parts for chip.The effect of electricity piezo-resistive conversion equipment is the change that the change of temperature sensitive device both end voltage or electric current converts to resistance.
The break-make of logic circuit determine temperature sensitive device whether with sky line parallel.When logic circuit disconnects, temperature sensitive device not with sky line parallel.Now temperature sensitive device is placed at a certain temperature, and the first resonant frequency of antenna and signal intensity remain unchanged.When logic circuit is connected, temperature sensitive device and sky line parallel, now it is placed at a certain temperature, the characteristic frequency of antenna and signal intensity at least have one and change, and now Antenna Operation is under the second resonant frequency.Reader can send the break-make of instruction control logic circuit to label, when logic circuit is connected, it is possible to by comparing the change detecting temperature from the difference between the signal intensity of the different frequency of antenna.
For an example, this system contains a label, and this label only has an antenna (monopole antenna).The chip of this label has two pins.Temperature sensitive device is connected with the two pin, forms parallel-connection structure with antenna.Having a logic circuit controlling break-make and an electric piezo-resistive conversion equipment with chip on the circuit that pin is connected, the circuit of this connection, the logic circuit controlling break-make and electricity piezo-resistive conversion equipment are parts for chip.The effect of electricity piezo-resistive conversion equipment is the change that the change of temperature sensitive device both end voltage or electric current converts to resistance.
When logic circuit is connected, temperature sensitive device is placed at a certain temperature, and antenna features frequency and signal intensity at least have one and change, and it is operated under the second resonant frequency.Reader can send instruction to label, and the difference between the signal intensity of different frequency during by CL Compare Logic connecting and disconnecting of the circuit can detect the change of temperature.More precisely, electricity piezo-resistive conversion equipment can be an equivalent circuit that variable voltage converts to variable-resistance device, a ditch type field effect transistor or field effect transistor.And the instantiation of temperature sensitive device includes: the temperature sensitive device of thermocouple, the temperature sensitive device of quasiconductor, PN junction brilliant temperature sensitive device, the temperature sensitive device of transistor, the temperature sensitive device of IGCT, integrated temperature sensitive device etc..
For another example, this system contains a label, and this label has two antennas (double-doublet antenna).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.Having a logic circuit controlling break-make and an electric piezo-resistive conversion equipment with chip on the circuit that pin is connected, the circuit of this connection, the logic circuit controlling break-make and electricity piezo-resistive conversion equipment are parts for chip.The effect of electricity piezo-resistive conversion equipment is the change that the change of temperature sensitive device both end voltage or electric current converts to resistance.The electric piezo-resistive conversion equipment being now connected with temperature sensitive device also with first sky line parallel, and second antenna is all the time with the first resonant frequency proper communication.
When logic circuit is connected, being placed at certain temperature, first antenna features frequency and signal intensity have at least a meeting to change, and it is operated under the second resonant frequency.Reader can send instruction to label, and during by CL Compare Logic circuit ON, difference between the signal intensity of the different frequency of first and second antennas can detect the change of temperature.Difference between the signal intensity of different frequency during by the logic circuit break-make that compares second antenna self 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.Having a logic circuit controlling break-make and an electric piezo-resistive conversion equipment with chip on the circuit that pin is connected, the circuit of this connection, the logic circuit controlling break-make and electricity piezo-resistive conversion equipment are parts for chip.The effect of electricity piezo-resistive conversion equipment is the change that the change of temperature sensitive device both end voltage or electric current converts to resistance.The electric piezo-resistive conversion equipment being now connected with temperature sensitive device is also simultaneously in parallel with these two antennas, and only situation containing an antenna is similar with label for this.
Be placed at a certain temperature when logic circuit is connected, antenna features frequency and signal intensity at least have one and change, and it is operated under the second resonant frequency.Reader can send instruction to label, and the difference between the signal intensity of different frequency during by CL Compare Logic connecting and disconnecting of the circuit can detect the change of temperature.The first situation circuit connects fairly simple, and during work, the resonant frequency of two antennas is likely to difference, can affect the precision of measurement.The second situation circuit connects more complicated, but during work, the resonant frequency of two antennas is consistent, and certainty of measurement is higher.More precisely, electricity piezo-resistive conversion equipment can be an equivalent circuit that variable voltage converts to variable-resistance device, a ditch type field effect transistor or field effect transistor.And the instantiation of temperature sensitive device includes: the temperature sensitive device of thermocouple, the temperature sensitive device of quasiconductor, PN junction brilliant temperature sensitive device, the temperature sensitive device of transistor, the temperature sensitive device of IGCT, integrated temperature sensitive device etc..
One pin configuration:
The chip of this label can only have a pin, and this pin is outwards connected with one end of temperature sensitive device, and the other end of temperature sensitive device is attached directly on antenna.Pin is similar at the junction point of chip internal and the situation of two pins, finally remains and to reach and the purpose of sky line parallel.On the circuit that pin is connected, there is a logic circuit controlling break-make with chip internal circuits simultaneously.It addition, an electric piezo-resistive conversion equipment in parallel again on the circuit of antenna, electricity piezo-resistive conversion equipment has again circuit to be connected with the two-termial line of temperature sensitive device and logic circuit.
When logic circuit disconnects, temperature sensitive device not with sky line parallel, be now placed at a certain temperature, the first resonant frequency of antenna and signal intensity remain unchanged.When logic circuit is connected, temperature sensitive device and sky line parallel, now it is placed at a certain temperature, antenna features frequency and signal intensity at least have one and change, and it is operated under the second resonant frequency.Reader can send the break-make of instruction control logic circuit to label, when logic circuit is connected, it is possible to by comparing the change detecting temperature from the difference between the signal intensity of the different frequency of antenna.
For an example, this system contains a label, and this label only has an antenna (monopole antenna).Temperature sensitive device is connected with this pin, and the other end of temperature sensitive device is attached directly on antenna, forms parallel-connection structure with this root antenna.Having a logic circuit controlling break-make and an electric piezo-resistive conversion equipment with chip on the circuit that pin is connected, the circuit of this connection, the logic circuit controlling break-make and electricity piezo-resistive conversion equipment are parts for chip.The effect of electricity piezo-resistive conversion equipment is the change that the change of temperature sensitive device both end voltage or electric current converts to resistance.
Be placed at a certain temperature when logic circuit is connected, antenna features frequency and signal intensity at least have one and change, and it is operated under the second resonant frequency.Reader can send instruction to label, and the difference between the signal intensity of different frequency during by CL Compare Logic connecting and disconnecting of the circuit can detect the change of temperature.More precisely, electricity piezo-resistive conversion equipment can be an equivalent circuit that variable voltage converts to variable-resistance device, a ditch type field effect transistor or field effect transistor.And the instantiation of temperature sensitive device includes: the temperature sensitive device of thermocouple, the temperature sensitive device of quasiconductor, PN junction brilliant temperature sensitive device, the temperature sensitive device of transistor, the temperature sensitive device of IGCT, integrated temperature sensitive device etc..
For another example, this system contains a label, and this label has two antennas (double-doublet antenna).Temperature sensitive device with this one by one pin be connected, the other end of temperature sensitive device is attached directly on antenna, forms parallel-connection structure with first antenna.Having a logic circuit controlling break-make and an electric piezo-resistive conversion equipment with chip on the circuit that pin is connected, the circuit of this connection, the logic circuit controlling break-make and electricity piezo-resistive conversion equipment are parts for chip.The effect of electricity piezo-resistive conversion equipment is the change that the change of temperature sensitive device both end voltage or electric current converts to resistance.The electric piezo-resistive conversion equipment being now connected with temperature sensitive device also with first sky line parallel, and second antenna is all the time with the first resonant frequency proper communication.
When logic circuit is connected, being placed at certain temperature, first Antenna Operation is under the second resonant frequency, and its characteristic frequency and signal intensity have at least a meeting to change.Reader can send instruction to label, and during by CL Compare Logic circuit ON, the difference between the signal intensity of the different frequency of first and second antennas can detect the change of temperature.Difference between the signal intensity of different frequency during by the logic circuit break-make that compares first antenna self can also detect the change of temperature.More precisely, electricity piezo-resistive conversion equipment can be an equivalent circuit that variable voltage converts to variable-resistance device, a ditch type field effect transistor or field effect transistor.And the instantiation of temperature sensitive device includes: the temperature sensitive device of thermocouple, the temperature sensitive device of quasiconductor, PN junction brilliant temperature sensitive device, the temperature sensitive device of transistor, the temperature sensitive device of IGCT, integrated temperature sensitive device etc..
Without pin configuration:
When not having pin on the chip of RFID tag, temperature sensitive device can be attached directly on antenna.Temperature sensitive device forms parallel-connection structure with antenna.Having a logic circuit controlling break-make and an electric piezo-resistive conversion equipment with chip on the circuit that antenna is connected, the circuit of this connection, the logic circuit controlling break-make and electricity piezo-resistive conversion equipment are parts for chip.The effect of electricity piezo-resistive conversion equipment is the change that the change of temperature sensitive device both end voltage or electric current converts to resistance.In this case, the antenna being connected with temperature sensitive device can not depart from temperature sensitive device and with the first resonant frequency communication.When being placed at a certain temperature, the second resonant frequency of antenna and signal intensity at least have one and change.Reader can send instruction to label apparatus, by comparing the change detecting temperature from the difference between the signal intensity of the different frequency of antenna.
For an example, this system contains a label, and this label has two antennas (double-doublet antenna).Temperature sensitive device is directly connected with first antenna.Temperature sensitive device forms parallel-connection structure with antenna.Having a logic circuit controlling break-make and an electric piezo-resistive conversion equipment with chip on the circuit that antenna is connected, the circuit of this connection, the logic circuit controlling break-make and electricity piezo-resistive conversion equipment are parts for chip.The effect of electricity piezo-resistive conversion equipment is the change that the change of temperature sensitive device both end voltage or electric current converts to resistance.And second antenna is not connected with temperature sensitive device all the time with the first resonant frequency proper communication.When being placed at certain temperature, first antenna features frequency and signal intensity have at least a meeting to change, and it is operated under the second resonant frequency, and the characteristic frequency of second antenna and signal intensity are constant.Reader can send instruction to label, and can detect the change of temperature by comparing the difference between the signal intensity of the different frequency of first and second antennas.More precisely, electricity piezo-resistive conversion equipment can be an equivalent circuit that variable voltage converts to variable-resistance device, a ditch type field effect transistor or field effect transistor.And the instantiation of temperature sensitive device includes: the temperature sensitive device of thermocouple, the temperature sensitive device of quasiconductor, PN junction brilliant temperature sensitive device, the temperature sensitive device of transistor, the temperature sensitive device of IGCT, integrated temperature sensitive device etc..
In the same way, on the chip of antenna can band can also without pin, it is possible to be with one and can also be with multiple pin.The radical of antenna can be one, two or even many.Can also connecting one or more temperature sensitive device accordingly, the model of temperature sensitive device can be the same or different simultaneously.It addition, the electric piezo-resistive conversion equipment being attached thereto can also have many changes.For a kind of instantiation of device, when being placed on at certain temperature, the resonant frequency of the antenna being connected with temperature sensitive device and signal intensity have at least a meeting to change.Reader can send instruction to label apparatus, by comparing the change detecting temperature from the difference between the signal intensity of the different frequency of antenna.
For the instantiation of a kind of temperature sensitive device, simultaneous compares the method for numerical value and includes that these compare numerical value and compare with most signal strength values.These signal strength values belong to different frequencies, and are associated with most temperature, are simultaneously based on comparison mentioned above and can detect the intensity of temperature.
But, for another aspect, a RFID system includes a RFID tag device and a RFID reader device.This RFID tag device is used to send two kinds of signals, and signal when signal when namely above-mentioned logic circuit disconnects is connected with logic circuit, both signals have at least a kind of meeting that the request being subject to is responded.RFID reader device is used for RFID tag device is at least sent a request.Install reading device be for the signal strength values when signal strength values when logic circuit received from label is connected and logic circuit disconnect between fiducial value, and these fiducial values are converted into the varying level of temperature.
In an example, the antenna of RFID tag is connected with temperature sensitive device, has a logic circuit controlling break-make on this connection line.Temperature sensitive device forms parallel-connection structure with antenna.Having a logic circuit controlling break-make and an electric piezo-resistive conversion equipment with chip on the circuit that antenna is connected, the circuit of this connection, the logic circuit controlling break-make and electricity piezo-resistive conversion equipment are parts for chip.The effect of electricity piezo-resistive conversion equipment is the change that the change of temperature sensitive device both end voltage or electric current converts to resistance.In logic circuit break-make whether two kinds of situations, this antenna has corresponding frequency two kinds different, i.e. the first resonant frequency and the second resonant frequency.When logic circuit is connected and this label apparatus is positioned at certain temperature, due to the change of resonant frequency, the intensity level of unlike signal will be produced.
In an example, RFID tag device includes first, second two antennas.Better, first antenna is connected with temperature sensitive device and electricity piezo-resistive conversion equipment, when this label apparatus is placed at certain temperature, due to the change of resonant frequency, will produce the different of secondary signal intensity level and the first signal strength values.
Another aspect, embodiments provides a kind of RFID system with temperature sensitive device, and described RFID system includes RFID tag and RFID reader, and described RFID tag includes the above-mentioned RFID tag with temperature sensitive device；Described RFID reader sends instruction to control the break-make of the logic circuit of RFID tag, thereby through comparing from the difference between the signal intensity of the different frequency of antenna to detect the change of temperature.
Another further aspect, embodiments provide the temperature checking method of a kind of RFID system with temperature sensitive device, described temperature checking method is applied to the above-mentioned RFID system with temperature sensitive device, including: send instruction to control the break-make of the logic circuit of RFID tag by described RFID reader；The instruction sent by RFID tag RFID reader is with the break-make of control logic circuit: when logic circuit disconnects, temperature sensitive device not with sky line parallel, be now placed at a certain temperature, the first resonant frequency of antenna and signal intensity remain unchanged；When logic circuit is connected, temperature sensitive device and sky line parallel, now it is placed at a certain temperature, the characteristic frequency of antenna and signal intensity at least have one and change, and now Antenna Operation is under the second resonant frequency；Described RFID reader is utilized to compare from the difference between the signal intensity of the different frequency of antenna to detect the change of temperature.
As it is shown in figure 1, the schematic diagram of the temperature sensitive label 10 being connected with RFID label chip for the temperature sensitive device of the embodiment of the present invention.As it is shown in figure 1, label apparatus 10, including a base 15, a surface-mounted integrated circuit 13,16,17 and one double-doublet antennas 11,12 of two pins.Having two pins 16,17 on surface-mounted integrated circuit 13, the two pin is outwards connected with temperature sensitive device 14, and the two pin is in parallel with the equivalent circuit of antenna at chip internal, and has a logic circuit controlling break-make on the circuit connected.Temperature sensitive device forms parallel-connection structure with antenna.Having a logic circuit controlling break-make and an electric piezo-resistive conversion equipment with chip on the circuit that antenna is connected, the circuit of this connection, the logic circuit controlling break-make and electricity piezo-resistive conversion equipment are parts for chip.The effect of electricity piezo-resistive conversion equipment is the change that the change of temperature sensitive device both end voltage or electric current converts to resistance.Can control whether temperature sensitive device is access in chip circuit by the break-make of logic circuit, such that it is able to affect the frequency of the antenna being connected with radio-frequency module.When logic circuit disconnects, label antenna is with the first resonant frequency communication.When logic circuit is connected, being placed at certain temperature, Antenna Operation is under the second resonant frequency, and its characteristic frequency and signal intensity at least have one and change.
In an example, transmitting terminal antenna 11,12 is made up of one or more different low electrical resistant materials, 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 be connected, when antenna 11,12 are placed at certain temperature, and temperature sensitive device can cause the change of one or more transmitting terminal generation resonant frequency.The frequency of this change is all different with the frequency of reception and transmission.Such as, when logic circuit is connected, temperature sensitive device is positioned at certain temperature, may result in transmission frequency and receives in frequency that 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, and then when reaching certain temperature, it will reduce.In another example, the antenna frequencies set at the beginning is lower than the antenna frequencies under uniform temperature, and when reaching certain temperature, it will rise.Can be used for the such temperature sensitive device of the present invention to have: the temperature sensitive device of thermocouple, the temperature sensitive device of quasiconductor, PN junction brilliant temperature sensitive device, the temperature sensitive device of transistor, the temperature sensitive device of IGCT, integrated temperature sensitive device etc..
Type based on temperature sensitive device is different, causes that the temperature of change is probably a specific temperature value and is also likely to be the scope of a selectively temperature value.The length of time necessarily causes the change of antenna resonance frequency, and antenna quality also results in different changes.Such as, on antenna with the type of temperature sensitive device can affect the length changing antenna resonance frequency required time.
As in figure 2 it is shown, be the equivalent circuit diagram of RFID label antenna.When tag coil antenna enters in the alternating magnetic field that read write line produces, the interaction between label antenna and reading and writing device antenna is similar to transformator.Both coils are equivalent to primary coil and the secondary coil of transformator.The resonant tank formed by label antenna is as in figure 2 it is shown, include the coil inductance (L) of label antenna, parasitic capacitance (Cp) and shunt capacitance (C2), and its resonant frequency isIn formula, C is the parallel equivalent electric capacity of Cp and C2, R1, and R2 is the equivalent resistance of circuit internal inductance coil and other devices.The carrier frequency that label and read write line two-way communication use is exactly f.When requiring that tag antenna coil profile is only small, namely area is little, and need certain operating distance, the aerial coil mutual induction amount that RFID tag and read write line are asked just substantially can not practical requirement, the Ferrite Material with high permeability can be inserted inside tag antenna coil, to increase mutual induction amount, thus the problem that bucking coil cross section is little.
As it is shown on figure 3, the schematic diagram being connected with RFID label antenna equivalent circuit for the temperature sensitive device of the embodiment of the present invention, the logic circuit controlling break-make and electricity piezo-resistive conversion equipment.The resonant tank formed by label antenna is as it can be seen, include the coil inductance (L) of label antenna, parasitic capacitance (Cp) and shunt capacitance (C2), and its resonant frequency isFormula C is the parallel equivalent electric capacity of Cp and C2, R1, and R2 is the equivalent resistance of circuit internal inductance coil and other devices.M is the variable resistance representing temperature sensitive device, and S is the logic circuit controlling break-make, and R3 is the equivalent resistance connected with temperature sensitive device, and F is electricity piezo-resistive conversion equipment.When logic circuit disconnects, temperature sensitive device not with sky line parallel, be now placed at a certain temperature, the first resonant frequency of antenna and signal intensity remain unchanged.When logic circuit is connected, temperature sensitive device and sky line parallel, now it is placed at a certain temperature, antenna features frequency and signal intensity at least have one and change, and now Antenna Operation is under the second resonant frequency.
As shown in Figure 4, for the schematic diagram that the temperature sensitive device of the embodiment of the present invention and RFID label antenna are joined directly together, the sketch of the passive RFID tags device 40 of variations in temperature can be detected.As shown in Figure 4, label apparatus 40 includes a base 45, an integrated circuit 43 and a double-doublet antenna 41,42.The temperature sensitive device 44 being connected with antenna 42 will affect the resistance of antenna 42.The material that temperature sensitive device 44 is suitable for can control any one frequency both pinpointed according to the current voltage of any in antenna 41,42.For an example, antenna 41,42 is installed it can be made to produce resonance in identical frequency.For another example, antenna 41,42 is installed it can be made to produce resonance in different frequencies.
In an example, transmitting terminal antenna 41,42 is 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 are connected with temperature sensitive device mentioned above, when antenna 41,42 are placed at certain temperature, and temperature sensitive device can cause the change of one or more transmitting terminal generation resonant frequency, thus causing a different frequency.The change of this frequency is all different with the frequency received and send.Such as, temperature sensitive device is positioned at certain temperature, may result in transmission frequency and receives in frequency that 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, and then when reaching certain temperature, it will reduce.In another example, the antenna frequencies set at the beginning is lower than the antenna frequencies under uniform temperature, and when reaching certain temperature, it will rise.Can be used for the such temperature sensitive device of the present invention to have: the temperature sensitive device of thermocouple, the temperature sensitive device of quasiconductor, PN junction brilliant temperature sensitive device, the temperature sensitive device of transistor, the temperature sensitive device of IGCT, integrated temperature sensitive device etc..
Type based on temperature sensitive device is different, causes that the temperature of change is probably a specific temperature value and is also likely to be the scope of a selectively temperature value.The length of time necessarily causes the change of antenna resonance frequency, and antenna quality also results in different changes.Such as, on antenna with the type of temperature sensitive device can affect the length changing antenna resonance frequency required time.
As shown in Fig. 5 .1, an exemplary construction of thermocouple includes thermode 511,512, platinum-rhodium wire 513, pure platinum filament 514, protection shell 515 and pad 516.The advantages such as that this thermocouple has that action response is fast, to measure end thermal capacity little, flexible is good, intensity is high, kind is many.
As shown in Fig. 5 .2, for the temperature sensitive device of PN junction.When the scope of measurement is at 0 ~ 150 DEG C, utilizing the voltage of diode PN junction and the characteristic of temperature, can be made into the temperature sensitive device of PN junction, not only linear ratio thermocouple is good, and sensitivity can reach 2mV/ DEG C.Owing to the hole in quasiconductor and electron concentration are greatly influenced by temperature, the temperature sensor therefore made according to the temperature characterisitic of quasiconductor is used widely on the medical instrument.Its accuracy of thermometer made with PN junction is mainly determined by the reading accuracy of display instrument, and its sensitivity is also that other kinds of sensor is unapproachable.
As shown in Figure 6, for by the present invention in that a kind of method flow diagram detecting temperature change with the label apparatus of multiple antennas.Need it is contemplated that, device mentioned above uses a label integrated circuit to carry out and the exchanging of multiple antennas.
As shown in Figure 6,50, RFID reader sends energy and instruction to label apparatus.52, logic circuit is in the state of disconnection at initial time, and label apparatus receives energy and instruction with temperature sensitive device with the antenna not being connected.54, label apparatus is converted into DC(direct current the electromagnetic wave carrying energy) 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 be connected with each other, or to use other energy conversion device.56, label apparatus sends signal by the sky alignment reader not being connected with temperature sensitive device.58, the energy intensity receiving signal is measured and recorded to reader.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 reflected signal intensity.68, fiducial value is changed into different temperature values by reader.For an example, reader can set a time period for receiving the signal of label, and without receiving signal, signal intensity will be recorded as 0 by reader.
In this system, reader is using from the signal strength values of the antenna not being connected with temperature sensitive device as a reference value, and the signal strength values of the label antenna that it is connected with temperature sensitive device compares.By the signal from the transmitting terminal being connected with temperature sensitive device and be not connected with temperature sensitive device received, reader can collect the fiducial value representing unlike signal intensity.Then, RFID reader can be converted into the temperature residing for label such a fiducial value.For a concrete example, configuring this RFID reader is to pass through to use the reference data stored that the difference from connection or the RF signal intensity of the antenna being not connected to temperature sensitive device received is converted into temperature value.
Best situation is, using the antenna that is not connected to temperature sensitive device as a reference, it is possible to the change caused due to the coupling between label and reader filtered out.Additionally, as previously mentioned, temperature sensitive device is applied in design to make the time length that the change of its resistance value and label be placed under specified temp and forms relation one to one.Such as, temperature sensitive device is only positioned on an antenna, the signal from RFID tag device so can be allowed to change within the specific limits as a kind of function, 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, when RFID tag is passive, RFID reader be able to detect that label apparatus whether be placed at certain temperature and this temperature whether within the acceptable range.
The various RFID tag not using two antennas also can perceive the change of temperature with temperature sensitive device, and the change that the change of sense temperature is based on antenna resonant frequency also is able to recognize antenna and receives the change of signal.
Such as by the design to the antenna being connected with temperature sensitive device, the frequency of antenna can be made at ISM(IndustrialScientificMedical, industry, science, medical science) change in frequency range, the label of standard can connect this and temperature sensitive device and antenna that logic circuit is connected.
Such as in a concrete example, label antenna can so set, before being exposed in uniform temperature environment, the resonant frequency of antenna is 902-928MHZ, but label is once exposed in uniform temperature environment, impact due to temperature, the resonant frequency of antenna just reduces to 899.5-927.5MHZ, frequency bins (902-928MHZ) at U.S. RFID is divided into 52 channels, the channel that can not receive of skipping that reader can be random in these 52 channels goes, the benefit of this jump of reader is exactly can attempt the conflict that uses same frequency to cause in same physical space by the multiple reader of effectively preventing.
Such as in one example, RFID frequency range (902-928MHZ) is not divided into 52 channels but has been divided equally into the antenna settings of n channel tag and has been operated under this frequency range (902-928MHZ).Owing to label antenna is connected with temperature sensitive device, as long as so temperature has exceeded the scope of value set in advance, the operating frequency of antenna tag antenna drops down among (899.5-927.5MHZ) this frequency range.Therefore just being got rid of from band limits by channel n compared with original frequency range and go, therefore the frequency range (899.5-927.5MHZ) after change just no longer allows label to carry out exchanging of information with channel n.
In concrete example, if the environment at label place has exceeded intended temperature range, reader sends instruction only by channel 1 to n-1 to label, label also can be made a response, because the antenna in label just can only at this frequency ranges of operation, when reader sends instruction with the frequency of n channel to label, because the resonant frequency that the change of label temperature already leads to label antenna has descended to 899.5-927.5MHZ, no longer reach 928MHZ so label is just no longer made a response, transmit information back to reader.
Favourable aspect is the change of the operating frequency of antenna caused beyond value set in advance due to temperature, is just reflected by the disappearance of this communication for information.
In a model, reader can send an instruction between channel n-1 and channel n to label and further confirm that the operating frequency range of label antenna has occurred that drift, because label is able to receive that by the channel n-1 instruction sent, and can pass through channel n-1 can to reader feedback information, because label can not receive by the channel n instruction sent, and can not pass through channel n can to reader feedback information, and the operating frequency range thus determining label antenna has occurred that drift.
The change of temperature causes that the operating frequency of label antenna occurs drift up and down and the present invention to be not limited in and frequency range is on average divided into n channel.
The embodiment of the present invention can detect variations in temperature at lower cost, and utilizes the RFID energy obtained, and solves the powerup issue of temperature detection.
The enforcement of each feature of this system may relate to software, hardware is likely to the combination relating to software and hardware and can be only achieved, for instance the enforcement of many advantages of system is to be realized by the mode mutually exchanged of a kind of high-caliber process of programming with OO programming language with computer and other equipment machines.Each such function program is likely to be stored in a storage intermediary and is realized above-mentioned function by a computer and processor reading in such as read only memory.
Those skilled in the art are it will also be appreciated that the various illustrative components, blocks (illustrativelogicalblock) listed of the embodiment of the present invention, unit, and step can pass through electronic hardware, computer software, or both combinations realize.For clearly showing that the replaceability (interchangeability) of hardware and software, above-mentioned various illustrative components (illustrativecomponents), unit and step have universally described their function.Such function is to realize depending on the designing requirement of specific application and whole system by hardware or software.Those skilled in the art can for every kind of specific application, it is possible to use various methods realize described function, but this realization is understood not to exceed the scope of embodiment of the present invention protection.
Various illustrative logical block described in the embodiment of the present invention, or unit is such as through general processor, digital signal processor, special IC (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the design of any of the above described combination realize or operate described function.General processor can be microprocessor, and alternatively, this general processor can also be any traditional processor, controller, microcontroller or state machine.Processor can also be realized by the combination of calculation element, for instance digital signal processor and microprocessor, multi-microprocessor, one or more microprocessors one Digital Signal Processor Core of associating, or any other like configuration realizes.
Method described in the embodiment of the present invention or the step of algorithm can be directly embedded into hardware, processor performs software module or the combination of both.Software module can be stored in RAM memory, flash memory, ROM memory, eprom memory, eeprom memory, depositor, hard disk, moveable magnetic disc, CD-ROM or this area in other any form of storage medium.Exemplarily, storage medium can be connected with processor, so that processor can read information from storage medium, 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 realize in the combination in any of hardware, software, firmware or this three.If realized in software, these functions can store and on the medium of computer-readable, or be transmitted on the medium of computer-readable with one or more instructions or code form.Computer readable medium includes computer storage medium and is easy to so that allowing computer program transfer to the telecommunication media in other place from a place.Storage medium can be that any general or special computer can the useable medium of access.Such as, such computer readable media can include but not limited to RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage device, or other any may be used for carrying or storage with instruction or data structure and other can be read the medium of program code of form by general or special computer or general or special processor.In addition, any connection can be properly termed computer readable medium, such as, if software is by a coaxial cable, optical fiber computer, twisted-pair feeder, Digital Subscriber Line (DSL) or being also contained in defined computer readable medium with wireless way for transmittings such as such as infrared, wireless and microwaves from a web-site, server or other remote resource.Described video disc (disk) and disk (disc) include Zip disk, radium-shine dish, CD, DVD, floppy disk and Blu-ray Disc, and disk is generally with magnetic duplication data, and video disc generally carries out optical reproduction data with laser.Combinations of the above can also be included in computer readable medium.
Above-described detailed description of the invention; the purpose of the present invention, technical scheme and beneficial effect have been further described; it is it should be understood that; the foregoing is only the specific embodiment of the present invention; the protection domain being not intended to limit the present invention; all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (8)
1. the RFID tag with temperature sensitive device, it is characterised in that have two pins on the chip of described RFID tag；Described temperature sensitive device is connected with the two pin, and form parallel-connection structure with the antenna of described RFID tag, the change of ambient temperature can cause the change of temperature sensitive device both end voltage or electric current, the circuit that described temperature sensitive device is connected with the chip of RFID tag has a logic circuit controlling break-make and an electric piezo-resistive conversion equipment, the circuit of this connection, this logic circuit and this electricity piezo-resistive conversion equipment are parts for chip, electricity piezo-resistive conversion equipment for converting the change of resistance to by the change of temperature sensitive device both end voltage or electric current, the break-make of logic circuit determine temperature sensitive device whether with sky line parallel: when logic circuit disconnects, temperature sensitive device not with sky line parallel, now it is placed at a certain temperature, first resonant frequency of antenna and signal intensity remain unchanged；When logic circuit is connected, temperature sensitive device and sky line parallel, now it is placed at a certain temperature, the characteristic frequency of antenna and signal intensity at least have one and change, and now Antenna Operation is under the second resonant frequency；The instruction that described RFID tag RFID reader sends is with the break-make of control logic circuit, thus realizing by comparing the change detecting temperature from the difference between the signal intensity of the different frequency of antenna；
Wherein, the antenna of described RFID tag is double-doublet antenna, and described temperature sensitive device includes: the temperature sensitive device of thermocouple, the temperature sensitive device of quasiconductor, PN junction brilliant temperature sensitive device, the temperature sensitive device of transistor, the temperature sensitive device of IGCT, integrated temperature sensitive device；
When the antenna of described RFID tag is double-doublet antenna, described RFID tag has two antennas: described temperature sensitive device and first antenna form parallel-connection structure, the electric piezo-resistive conversion equipment being connected with temperature sensitive device also with first sky line parallel, second antenna is all the time with described first resonant frequency proper communication, the change of the Difference test temperature between the signal intensity of different frequency when described RFID reader is by the logic circuit break-make of relatively described first antenna self, or, the change of Difference test temperature between the signal intensity of the different frequency of first antenna and second antenna during by CL Compare Logic circuit ON；Or, described temperature sensitive device and two antennas concurrently form parallel-connection structure, the electric piezo-resistive conversion equipment being connected with temperature sensitive device is also simultaneously in parallel with two antennas, and described RFID reader is by comparing the change of two antennas Difference test temperature between the signal intensity of the different frequency when logic circuit break-make.
2. the RFID tag with temperature sensitive device as claimed in claim 1, it is characterised in that described electricity piezo-resistive conversion equipment includes: a variable voltage converts the equivalent circuit of variable-resistance device or field effect transistor to.
3. the RFID tag with temperature sensitive device, it is characterised in that have a pin on the chip of described RFID tag；One end of described temperature sensitive device is connected with this pin, the other end is connected on the antenna of described RFID tag, and form parallel-connection structure with antenna, the change of ambient temperature can cause the change of temperature sensitive device both end voltage or electric current, the circuit that described temperature sensitive device is connected with the chip of RFID tag has a logic circuit controlling break-make and an electric piezo-resistive conversion equipment, the circuit of this connection, this logic circuit and this electricity piezo-resistive conversion equipment are parts for chip, electricity piezo-resistive conversion equipment for converting the change of resistance to by the change of temperature sensitive device both end voltage or electric current, the break-make of logic circuit determine temperature sensitive device whether with sky line parallel: when logic circuit disconnects, temperature sensitive device not with sky line parallel, now it is placed at a certain temperature, first resonant frequency of antenna and signal intensity remain unchanged；When logic circuit is connected, temperature sensitive device and sky line parallel, now it is placed at a certain temperature, the characteristic frequency of antenna and signal intensity at least have one and change, and now Antenna Operation is under the second resonant frequency；The instruction that described RFID tag RFID reader sends is with the break-make of control logic circuit, thus realizing by comparing the change detecting temperature from the difference between the signal intensity of the different frequency of antenna；
Wherein, described antenna is double-doublet antenna, and described temperature sensitive device includes: the temperature sensitive device of thermocouple, the temperature sensitive device of quasiconductor, PN junction brilliant temperature sensitive device, the temperature sensitive device of transistor, the temperature sensitive device of IGCT, integrated temperature sensitive device；
When the antenna of described RFID tag is double-doublet antenna, described RFID tag has two antennas: described temperature sensitive device and first antenna form parallel-connection structure, the electric piezo-resistive conversion equipment being connected with temperature sensitive device also with first sky line parallel, second antenna is all the time with described first resonant frequency proper communication, the change of the Difference test temperature between the signal intensity of different frequency when described RFID reader is by the logic circuit break-make of relatively described first antenna self, or, the change of Difference test temperature between the signal intensity of the different frequency of first antenna and second antenna during by CL Compare Logic circuit ON；Or, described temperature sensitive device and two antennas concurrently form parallel-connection structure, the electric piezo-resistive conversion equipment being connected with temperature sensitive device is also simultaneously in parallel with two antennas, and described RFID reader is by comparing the change of two antennas Difference test temperature between the signal intensity of the different frequency when logic circuit break-make.
4. the RFID tag with temperature sensitive device as claimed in claim 3, it is characterised in that described electricity piezo-resistive conversion equipment includes: a variable voltage converts the equivalent circuit of variable-resistance device or field effect transistor to.
5. the RFID tag with temperature sensitive device, it is characterized in that, described temperature sensitive device is connected on the antenna of described RFID tag, and form parallel-connection structure with antenna, the change of ambient temperature can cause the change of temperature sensitive device both end voltage or electric current, the circuit that described temperature sensitive device is connected with antenna has a logic circuit controlling break-make and an electric piezo-resistive conversion equipment, the circuit of this connection, this logic circuit and this electricity piezo-resistive conversion equipment are parts for chip, electricity piezo-resistive conversion equipment for converting the change of resistance to by the change of temperature sensitive device both end voltage or electric current, the break-make of logic circuit determine temperature sensitive device whether with sky line parallel: when logic circuit disconnects, temperature sensitive device not with sky line parallel, now it is placed at a certain temperature, first resonant frequency of antenna and signal intensity remain unchanged；When logic circuit is connected, temperature sensitive device and sky line parallel, now it is placed at a certain temperature, the characteristic frequency of antenna and signal intensity at least have one and change, and now Antenna Operation is under the second resonant frequency；The instruction that described RFID tag RFID reader sends is with the break-make of control logic circuit, thus realizing by comparing the change detecting temperature from the difference between the signal intensity of the different frequency of antenna；
Wherein, described antenna is double-doublet antenna, and described temperature sensitive device includes: the temperature sensitive device of thermocouple, the temperature sensitive device of quasiconductor, PN junction brilliant temperature sensitive device, the temperature sensitive device of transistor, the temperature sensitive device of IGCT, integrated temperature sensitive device；
When the antenna of described RFID tag is double-doublet antenna, described RFID tag has two antennas: described temperature sensitive device and first antenna form parallel-connection structure, the electric piezo-resistive conversion equipment being connected with temperature sensitive device also with first sky line parallel, second antenna is all the time with described first resonant frequency proper communication, the change of the Difference test temperature between the signal intensity of different frequency when described RFID reader is by the logic circuit break-make of relatively described first antenna self, or, the change of Difference test temperature between the signal intensity of the different frequency of first antenna and second antenna during by CL Compare Logic circuit ON；Or, described temperature sensitive device and two antennas concurrently form parallel-connection structure, the electric piezo-resistive conversion equipment being connected with temperature sensitive device is also simultaneously in parallel with two antennas, and described RFID reader is by comparing the change of two antennas Difference test temperature between the signal intensity of the different frequency when logic circuit break-make.
6. the RFID tag with temperature sensitive device as claimed in claim 5, it is characterised in that described electricity piezo-resistive conversion equipment includes: a variable voltage converts the equivalent circuit of variable-resistance device or field effect transistor to.
7. the RFID system with temperature sensitive device, described RFID system includes RFID tag and RFID reader, it is characterised in that
Described RFID tag includes the RFID tag according to any one of claim 1-2 with temperature sensitive device, or RFID tag with temperature sensitive device according to any one of claim 3-4, or RFID tag with temperature sensitive device according to any one of claim 5-6；
Described RFID reader sends instruction to control the break-make of the logic circuit of RFID tag, thereby through comparing from the difference between the signal intensity of the different frequency of antenna to detect the change of temperature.
8. the temperature checking method of the RFID system with temperature sensitive device, it is characterised in that described temperature checking method is applied to the RFID system described in claim 7 with temperature sensitive device, including:
Instruction is sent to control the break-make of the logic circuit of RFID tag by described RFID reader；
The instruction sent by RFID tag RFID reader is with the break-make of control logic circuit: when logic circuit disconnects, temperature sensitive device not with sky line parallel, be now placed at a certain temperature, the first resonant frequency of antenna and signal intensity remain unchanged；When logic circuit is connected, temperature sensitive device and sky line parallel, now it is placed at a certain temperature, the characteristic frequency of antenna and signal intensity at least have one and change, and now Antenna Operation is under the second resonant frequency；
Described RFID reader is utilized to compare from the difference between the signal intensity of the different frequency of antenna to detect the change of temperature.
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| EP3286534B1 (en) * | 2015-04-22 | 2019-06-12 | Paksense Inc. | Environmental and product sensing |
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| CN1965324A (en) * | 2004-04-08 | 2007-05-16 | 3M创新有限公司 | Variable frequency radio frequency identification (RFID) tags |
| CN101383020A (en) * | 2008-10-14 | 2009-03-11 | 厦门大学 | Environment sensitive type passive electronic label |
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| US8228172B2 (en) * | 2008-09-30 | 2012-07-24 | Motorola Solutions, Inc. | RFID tag device with temperature sensitive antenna |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1965324A (en) * | 2004-04-08 | 2007-05-16 | 3M创新有限公司 | Variable frequency radio frequency identification (RFID) tags |
| CN101383020A (en) * | 2008-10-14 | 2009-03-11 | 厦门大学 | Environment sensitive type passive electronic label |
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