CN102722746A - RFID label with thermosensitive device, RFID system and temperature detection method - Google Patents
RFID label with thermosensitive device, RFID system and temperature detection method Download PDFInfo
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- CN102722746A CN102722746A CN2012101794964A CN201210179496A CN102722746A CN 102722746 A CN102722746 A CN 102722746A CN 2012101794964 A CN2012101794964 A CN 2012101794964A CN 201210179496 A CN201210179496 A CN 201210179496A CN 102722746 A CN102722746 A CN 102722746A
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Abstract
The invention provides an RFID (radio frequency identification card) label with a thermosensitive device, an RFID system and a temperature detection method. The thermosensitive device and an antenna of the RFID label form a parallel connection structure, a logic circuit for controlling connection/disconnection is arranged on a line where the thermosensitive device is connected with a chip of the RFID label, the connected line and the logic circuit for controlling connection/disconnection are one part of the chip; when the logic circuit is disconnected, the thermosensitive device is not connected with the antenna in parallel, and both a first resonant frequency and the signal strength of the antenna are kept unchanged after the antenna is placed for a period of time at a certain temperature; when the logic circuit is connected, the thermosensitive device is connected with the antenna in parallel, the antenna works at a second resonant frequency when placed for a period of time at the certain temperature; the RFID label receives an instruction sent by an RFID reader to control the connection/disconnection of the logic circuit, so that the temperature change is detected by comparing differences of strengths of signals from the antennas at different frequencies at lower cost.
Description
Technical field
The present invention relates to RFID (Radio Frequency Identification, RF identification) technical field, relate in particular to a kind of RFID label, rfid system and 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.In general, this system comprises a RFID reader at least, and the radiofrequency signal from one or more RFID labels can launched and accept to this RFID reader in the scope of a setting.This RFID label generally encapsulates, and can be attached on the object, and it comprises the microchip that an ability and antenna carry out information interchange.This microchip is an integrated circuit in general, and it can be used for storing and process information, the modulation radiofrequency signal, and can move other specific function.The antenna of RFID label is to be used for receiving and sending radiofrequency signal, and is applicable to a kind of special frequency usually.
In some equipment, when the temperature that the rfid system that has temperature sensitive device has been used to monitor product environment of living in has surpassed the acceptable temperature.In general these equipment requirements induction installations will have a lasting energy source, are used for the change of detected temperatures, but this can increase the cost of equipment.In addition, some equipment requirements induction installations also will link to each other with a comparator circuit, thereby detect the degree size that departs from reference voltage, and this requirement has increased the cost of equipment greatly.In a word, improve rfid system and be necessary, its requires when not using lasting energy source or use a kind of adjunct circuit cheaply, can be used for detected temperatures and changes.
Summary of the invention
The embodiment of the invention provides a kind of RFID label, rfid system and temperature checking method with temperature sensitive device, comes detected temperatures to change at lower cost.
On the one hand, the embodiment of the invention provides a kind of RFID label with temperature sensitive device, and two pins are arranged on the chip of said RFID label; Two pins of said temperature sensitive device and this link to each other; And form parallel-connection structure with the antenna of said RFID label; The variation of ambient temperature can cause the changes in resistance of temperature sensitive device own, and the logical circuit of a control break-make is arranged on said temperature sensitive device and circuit that the chip of RFID label is connected, and the circuit of this connection is the part of chip with the logical circuit of control break-make; The break-make of logical circuit determined temperature sensitive device whether with the sky line parallel: when logical circuit breaks off; Temperature sensitive device not with the sky line parallel, this moment be placed on certain following a period of time of temperature levels after, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit is connected, a temperature sensitive device and a day line parallel, be placed on certain following a period of time of temperature levels this moment after, the characteristic frequency of antenna and signal intensity have one at least and change, antenna is operated under second resonant frequency at this moment; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes coming from the difference between the signal intensity of the different frequency of antenna through comparison the change of detected temperatures.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a monopole antenna.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a double-doublet antenna: said temperature sensitive device forms parallel-connection structure with antenna wherein; Perhaps said temperature sensitive device and two antennas form parallel-connection structure simultaneously.
Optional, in an embodiment of the present invention, said temperature sensitive device is the temperature sensitive device of resistor-type, said temperature sensitive device comprises: the temperature sensitive device of thermistor, the temperature sensitive device of double-metal sheet type, the temperature sensitive device of condenser type.
On the other hand, the embodiment of the invention provides a kind of RFID label with temperature sensitive device, and a pin is arranged on the chip of said RFID label; One end of said temperature sensitive device links to each other with this pin; The other end is connected on the antenna of said RFID label; And form parallel-connection structure with antenna; The variation of ambient temperature can cause the changes in resistance of temperature sensitive device own, and the logical circuit of a control break-make is arranged on said temperature sensitive device and circuit that the chip of RFID label is connected, and the circuit of this connection is the part of chip with the logical circuit of control break-make; The break-make of logical circuit determined temperature sensitive device whether with the sky line parallel: when logical circuit breaks off; Temperature sensitive device not with the sky line parallel, this moment be placed on certain following a period of time of temperature levels after, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit is connected, a temperature sensitive device and a day line parallel, be placed on certain following a period of time of temperature levels this moment after, the characteristic frequency of antenna and signal intensity have one at least and change, antenna is operated under second resonant frequency at this moment; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes coming from the difference between the signal intensity of the different frequency of antenna through comparison the change of detected temperatures.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a monopole antenna.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a double-doublet antenna: said temperature sensitive device forms parallel-connection structure with antenna wherein; Perhaps said temperature sensitive device and two antennas form parallel-connection structure simultaneously.
Optional, in an embodiment of the present invention, said temperature sensitive device is the temperature sensitive device of resistor-type, the temperature sensitive device of said resistor-type comprises: the temperature sensitive device of thermistor, the temperature sensitive device of double-metal sheet type, the temperature sensitive device of condenser type.
Another aspect; The embodiment of the invention provides a kind of RFID label with temperature sensitive device; Said temperature sensitive device is connected on the antenna of said RFID label, and forms parallel-connection structure with antenna, and the variation of ambient temperature can cause the changes in resistance of temperature sensitive device own; The logical circuit that a control break-make is arranged on said temperature sensitive device and circuit that antenna is connected; The circuit of this connection is the part of chip with the logical circuit of control break-make, the break-make of logical circuit determined temperature sensitive device whether with the sky line parallel: when logical circuit breaks off, temperature sensitive device not with the sky line parallel; After being placed on certain following a period of time of temperature levels, first resonant frequency and the signal intensity of antenna remain unchanged this moment; When logical circuit is connected, a temperature sensitive device and a day line parallel, be placed on certain following a period of time of temperature levels this moment after, the characteristic frequency of antenna and signal intensity have one at least and change, antenna is operated under second resonant frequency at this moment; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes coming from the difference between the signal intensity of the different frequency of antenna through comparison the change of detected temperatures.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a monopole antenna.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a double-doublet antenna: said temperature sensitive device forms parallel-connection structure with antenna wherein; Perhaps said temperature sensitive device and two antennas form parallel-connection structure simultaneously.
Optional, in an embodiment of the present invention, said temperature sensitive device is the temperature sensitive device of resistor-type, the temperature sensitive device of said resistor-type comprises: the temperature sensitive device of thermistor, the temperature sensitive device of double-metal sheet type, the temperature sensitive device of condenser type.
On the one hand, the embodiment of the invention provides a kind of rfid system with temperature sensitive device again, and said rfid system comprises RFID label and RFID reader, and said RFID label comprises above-mentioned RFID label with temperature sensitive device; Said RFID reader sends the break-make of instruction with the logical circuit of control RFID label, thereby comes the change of detected temperatures from the difference between the signal intensity of the different frequency of antenna through comparison.
Again on the one hand; The embodiment of the invention provides a kind of temperature checking method of the rfid system with temperature sensitive device; Said temperature checking method is applied to above-mentioned rfid system with temperature sensitive device, comprising: send the break-make of instruction with the logical circuit of control RFID label through said RFID reader; Receive the break-make of the instruction of RFID reader transmission through the RFID label: when logical circuit breaks off with control logic circuit; Temperature sensitive device not with the sky line parallel; Be placed on this moment under certain temperature strength, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, temperature sensitive device was placed under certain temperature strength with a day line parallel, this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Utilize the comparison of said RFID reader to come the change of detected temperatures from the difference between the signal intensity of the different frequency of antenna.
Technique scheme has following beneficial effect: because adopt the antenna of temperature sensitive device and RFID label to form parallel-connection structure; The logical circuit that a control break-make is arranged on temperature sensitive device and circuit that the chip of RFID label is connected; The circuit of this connection is the part of chip with the logical circuit of control break-make: when logical circuit breaks off; Temperature sensitive device not with the sky line parallel; After being placed on certain following a period of time of temperature levels, first resonant frequency and the signal intensity of antenna remain unchanged this moment; When logical circuit is connected, a temperature sensitive device and a day line parallel, be placed on certain following a period of time of temperature levels this moment after, this moment, antenna was operated under second resonant frequency; The RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit; Thereby realize coming from the difference between the signal intensity of the different frequency of antenna the technological means of the change of detected temperatures through comparison; So reached the technique effect that comes detected temperatures to change at lower cost; And the energy that utilizes RFID to obtain, solved the powerup issue of temperature detection.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The synoptic diagram that Fig. 1 is connected with the RFID label chip for the temperature sensitive device of the embodiment of the invention;
Fig. 2 is the equivalent circuit diagram of RFID label chip inside antenna;
Fig. 3 is the synoptic diagram that the temperature sensitive device of the embodiment of the invention, logic switch are connected with RFID label chip inside antenna equivalent electrical circuit;
The synoptic diagram that Fig. 4 directly is connected for temperature sensitive device of the embodiment of the invention and RFID label antenna;
Fig. 5 .1-Fig. 5 .2 is the structure key diagram of the temperature sensitive device of the embodiment of the invention;
Fig. 6 is the process flow diagram of the embodiment of the invention based on the temperature levels detection method of signal intensity.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The temperature sensitive device of the embodiment of the invention links to each other with the chip of RFID label and has three kinds of situation at least:
The two pins structure:
The embodiment of the invention is a kind of device, system and technology that detected temperatures changes that be used for.This system has comprised a RFID label, and two pins are arranged on the chip of this RFID label.Two pins of temperature sensitive device and this link to each other, and form parallel-connection structure with antenna.The variation of ambient temperature can cause the changes in resistance of temperature sensitive device own.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the circuit of this connection is the part of chip with the logical circuit of control break-make.The break-make of logical circuit determined temperature sensitive device whether with the sky line parallel.
When logical circuit breaks off, temperature sensitive device not with the sky line parallel, this moment be placed on certain following a period of time of temperature levels after, first resonant frequency and the signal intensity of antenna remain unchanged.When logical circuit is connected, a temperature sensitive device and a day line parallel, be placed on certain following a period of time of temperature levels this moment after, the characteristic frequency of antenna and signal intensity have one at least and change, antenna is operated under second resonant frequency at this moment.The RFID reader can send the break-make of instruction control logical circuit to label, when logical circuit is connected, can come the change of detected temperatures through comparison from the difference between the signal intensity of the different frequency of antenna.
With regard to an instance, this system has comprised a RFID label, has only an antenna on this label.Two pins are arranged on the chip of this label.Two pins of temperature sensitive device and this link to each other, and form parallel-connection structure with this root antenna.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the logical circuit of the circuit of this connection and control break-make is the part of chip.The variation of ambient temperature can cause the changes in resistance of temperature sensitive device own.
After when logical circuit is connected, being placed on certain following a period of time of temperature levels, the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency.The RFID reader can send instruction to label, and the change that the difference between the signal intensity of the different frequency during through the comparison logic break-make can detected temperatures.Or rather, temperature sensitive device should have lower resistance, and its instantiation comprises: the temperature sensitive device of thermistor, the temperature sensitive device of double-metal sheet type, the temperature sensitive device of condenser type etc.
With regard to another instance, this system has comprised a RFID label, and two antennas are arranged on this label.Two kinds of situation are arranged this moment.First kind of situation is that two pins of temperature sensitive device and this link to each other, and forms parallel-connection structure with first antenna.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the logical circuit of the circuit of this connection and control break-make is the part of chip.The variation of ambient temperature can cause the changes in resistance of temperature sensitive device own.And second antenna is all the time with the first resonant frequency proper communication.
When logical circuit is connected, be placed on certain following a period of time of temperature levels after, the characteristic frequency of first antenna and signal intensity have at least a meeting to change, it is operated under second resonant frequency.The RFID reader can send instruction to label, and the change that the difference between the signal intensity of the different frequency of first and second antennas can detected temperatures when connecting through comparison logic.Difference between the signal intensity of the different frequency during logical circuit break-make through second antenna self relatively also can detected temperatures change.
Second kind of situation is that two pins of temperature sensitive device and this link to each other, and form parallel-connection structure simultaneously with two antennas.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the logical circuit of the circuit of this connection and control break-make is the part of chip.The variation of ambient temperature can cause the changes in resistance of temperature sensitive device own.The situation that this and label only contain an antenna is similar.
After when logical circuit is connected, being placed on certain following a period of time of temperature levels, antenna features frequency and signal intensity have one at least and change, and it is operated under second resonant frequency.The RFID reader can send instruction to label, and the change that the difference between the signal intensity of the different frequency during through the comparison logic break-make can detected temperatures.First kind of situation circuit connection is fairly simple, and the resonant frequency of two antennas maybe be different during work, can influence the precision of measurement.Second kind of situation circuit connects more complicated, but the resonant frequency of two antennas is consistent during work, and measuring accuracy is higher.Or rather, temperature sensitive device should have lower resistance, and its instantiation comprises: the temperature sensitive device of thermistor, the temperature sensitive device of double-metal sheet type, 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 links to each other with an end of temperature sensitive device, and the other end of temperature sensitive device is directly linked on the antenna.Pin is similar in the situation of the tie point of chip internal and two pins, finally remains the purpose that will reach with day line parallel.Simultaneously on pin and circuit that the chip internal circuit is connected, a logical circuit of controlling break-make is arranged.When logical circuit breaks off, temperature sensitive device not with the sky line parallel, this moment be placed on certain following a period of time of temperature levels after, first resonant frequency and the signal intensity of antenna remain unchanged.
When logical circuit is connected, a temperature sensitive device and a day line parallel, be placed on certain following a period of time of temperature levels this moment after, antenna features frequency and signal intensity have one at least and change, it is operated under second resonant frequency.The RFID reader can send the break-make of instruction control logical circuit to label, when logical circuit is connected, can come the change of detected temperatures through comparison from the difference between the signal intensity of the different frequency of antenna.
With regard to an instance, this system has comprised a RFID label, has only an antenna on this label.A pin is arranged on the chip of this label.Temperature sensitive device links to each other with this pin, and the temperature sensitive device other end is directly linked on the antenna, forms parallel-connection structure with antenna.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the logical circuit of the circuit of this connection and control break-make is the part of chip.The variation of ambient temperature can cause the changes in resistance of temperature sensitive device own.
After when logical circuit is connected, being placed on certain following a period of time of temperature levels, antenna is operated under second resonant frequency, and its characteristic frequency and signal intensity have one at least and change.The RFID reader can send instruction to label, and the change that the difference between the signal intensity of the different frequency during through the comparison logic break-make can detected temperatures.Or rather, temperature sensitive device should have lower resistance, and its instantiation comprises: the temperature sensitive device of thermistor, the temperature sensitive device of double-metal sheet type, the temperature sensitive device of condenser type etc.
With regard to another instance, this system has comprised a RFID label, and two antennas are arranged on this label.A pin is arranged on the chip of label.Temperature sensitive device links to each other with this pin, and the temperature sensitive device other end is directly linked on the antenna, forms parallel-connection structure with first antenna.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the logical circuit of the circuit of this connection and control break-make is the part of chip.The variation of ambient temperature can cause the changes in resistance of temperature sensitive device own.And second antenna is all the time with the first resonant frequency communication.
When logical circuit is connected, be placed on certain following a period of time of temperature levels after, first antenna is operated under second resonant frequency, its characteristic frequency and signal intensity have at least a meeting to change.The RFID reader can send instruction to label, and the change that the difference between the signal intensity of the different frequency of first and second antennas can detected temperatures when connecting through comparison logic.Difference between the signal intensity of the different frequency during logical circuit break-make through first antenna self relatively also can detected temperatures change.Or rather, temperature sensitive device should have lower resistance, and its instantiation comprises: the temperature sensitive device of thermistor, the temperature sensitive device of double-metal sheet type, the temperature sensitive device of condenser type etc.
No pin configuration:
When not having pin on the chip of RFID label, temperature sensitive device can directly be linked on the antenna.In this case, the antenna that links to each other with temperature sensitive device can not break away from temperature sensitive device and with normal frequency for communication.After being placed on certain following a period of time of temperature levels, the characteristic frequency of antenna and signal intensity have one at least and change.The RFID reader can send instruction to label apparatus, comes the change of detected temperatures from the difference between the signal intensity of the different frequency of antenna through comparison.
With regard to an instance, this system has comprised a RFID label, and two antennas are arranged on this label.Temperature sensitive device directly links to each other with first antenna, and second antenna do not link to each other with temperature sensitive device all the time with the first resonant frequency proper communication.After being placed on certain following a period of time of temperature levels, first antenna is operated under second resonant frequency, and its characteristic frequency and signal intensity have at least a meeting to change, and the characteristic frequency of second antenna and signal intensity are constant.The RFID reader can send instruction to label, and the change that the difference between the signal intensity of the different frequency through first and second antennas of comparison can detected temperatures.Or rather, temperature sensitive device should have lower resistance, and its instantiation comprises: the temperature sensitive device of thermistor, the temperature sensitive device of double-metal sheet type, the temperature sensitive device of condenser type etc.
In the same way, can be with on the chip of antenna also and can not be with pin, can be with one also can be with a plurality of pins.The radical of antenna can be one, two or even many.Also can connect one or more temperature sensitive devices accordingly, the model of temperature sensitive device can be the same or different simultaneously.With regard to a kind of instantiation of device, after being placed on certain following a period of time of temperature levels, the characteristic frequency of the antenna that links to each other with temperature sensitive device and signal intensity have at least a meeting to change.The RFID reader can send instruction to label apparatus, comes the change of detected temperatures from the difference between the signal intensity of the different frequency of antenna through comparison.
With regard to a kind of instantiation of temperature sensitive device, the method for simultaneous comparison numerical value comprises that these are compared numerical value compares with most signal strength values.These signal strength values belong to different frequencies, and interrelate with the temperature value of majority, simultaneously based on the above-mentioned comparison of mentioning can detected temperatures level.
Yet with regard to another aspect, a rfid system comprises a RFID label apparatus and a RFID reader device.This RFID label apparatus is used to send two kinds of signals, the signal when signal when promptly above-mentioned logical circuit breaks off and logical circuit are connected, and these two kinds of signals have at least a kind of meeting that the request that receives is responded.The RFID reader device is used for the RFID label apparatus is sent a request at least.Fiducial value between the signal strength values when reading device being installed being signal strength values and logical circuit in order accepting to connect and to break off from the logical circuit of label, and be converted into these fiducial values the varying level of temperature.
In an example, the antenna of RFID label links to each other with temperature sensitive device, and the logical circuit of a control break-make is arranged on this connection line.Under logical circuit break-make whether two kinds of situation, have two kinds of corresponding with it different frequencies with antenna.After logical circuit is connected and is positioned over certain following a period of time of temperature levels to this label apparatus, because the variation of resonant frequency, will produce the intensity level of unlike signal.
In an example, the RFID label apparatus comprises first, second two antennas.Better situation is, first antenna links to each other with temperature sensitive device, after this label apparatus is placed on certain following a period of time of temperature levels, owing to the variation of resonant frequency, will produce the different of secondary signal intensity level and first signal strength values.
On the one hand, the embodiment of the invention provides a kind of rfid system with temperature sensitive device again, and said rfid system comprises RFID label and RFID reader, and said RFID label comprises above-mentioned RFID label with temperature sensitive device; Said RFID reader sends the break-make of instruction with the logical circuit of control RFID label, thereby comes the change of detected temperatures from the difference between the signal intensity of the different frequency of antenna through comparison.
Again on the one hand; The embodiment of the invention provides a kind of temperature checking method of the rfid system with temperature sensitive device; Said temperature checking method is applied to above-mentioned rfid system with temperature sensitive device, comprising: send the break-make of instruction with the logical circuit of control RFID label through said RFID reader; Receive the break-make of the instruction of RFID reader transmission through the RFID label: when logical circuit breaks off with control logic circuit; Temperature sensitive device not with the sky line parallel; Be placed on this moment under certain temperature strength, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, temperature sensitive device was placed under certain temperature strength with a day line parallel, this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Utilize the comparison of said RFID reader to come the change of detected temperatures from the difference between the signal intensity of the different frequency of antenna.
As shown in Figure 1, the synoptic diagram of the temperature-sensitive label 10 that is connected with the RFID label chip for the temperature sensitive device of the embodiment of the invention.Among Fig. 1, label apparatus 10 comprises 13, two pins 16,17 of 15, one surface-mounted integrated circuits of a base and a double-doublet antenna 11,12.Two pins 16,17 are arranged on the surface-mounted integrated circuit 13, and these two pins outwards link to each other with temperature sensitive device 14, and these two pins are parallelly connected with the equivalent electrical circuit of antenna at chip internal, and the logical circuit of a control break-make is arranged on the circuit that connects.Whether temperature sensitive module can be controlled by in the access chip circuit through the break-make of logical circuit, thereby the frequency of the antenna that links to each other with radio-frequency module can be influenced.When logical circuit broke off, label antenna was with the first resonant frequency communication.When logical circuit is connected, be placed on certain following a period of time of temperature levels after, antenna is operated under second resonant frequency, its characteristic frequency and signal intensity have one at least and change.
In an example, transmitting terminal 11,12 is processed by one or more different low electrical resistant materials, and these materials have higher electric conductivity; Copper for example, silver, and aluminium; They link to each other with antenna 11,12 through two pins 16,17 with the above-mentioned temperature sensitive device of mentioning; After antenna 11,12 was placed on certain following a period of time of temperature levels, temperature sensitive device can cause the variation of one or more transmitting terminal generation resonant frequencies.The frequency of the frequency of this variation and reception and transmission is all different.For example, after temperature sensitive device is positioned over certain following a period of time of temperature levels, will causes sending frequency and accept that at least one changes in the frequency.
In another example, the antenna frequencies value of setting at the beginning will be higher than the antenna frequencies under the uniform temperature environment, and when reaching certain temperature, it will reduce then.In another example, the antenna frequencies of setting at the beginning is lower than the antenna frequencies under the uniform temperature level, and it will rise when reaching certain temperature levels.Can be used for so temperature sensitive device of the present invention has: the temperature sensitive device of thermistor, 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, and the temperature levels that causes changing possibly be that a specific temperature value also possibly be a scope of temperature value selectively.The length of time must cause the variation of antenna resonance frequency, and antenna quality also can cause different variations.The type of the temperature sensitive device that for example, has on the antenna can influence the length that changes the antenna resonance frequency required time.
As shown in Figure 2, be the equivalent circuit diagram of RFID label antenna.In the alternating magnetic field that tag coil antenna entering read write line produces, the interaction between label antenna and the reading and writing device antenna just is similar to transformer.Both coils are equivalent to the primary coil and the secondary coil of transformer.Resonant tank by label antenna forms is as shown in Figure 2, comprises coil inductance (L), the stray capacitance (C of label antenna
p) and shunt capacitance (C
2), its resonance frequency does
C is C in the formula
pAnd C
2Parallelly connected equivalent capacity, R
1, R
2Equivalent resistance for circuit internal inductance coil and other devices.The carrier frequency that label and read write line two-way communication are used is exactly f.The tag antenna coil profile is very little when requiring; Be that area is little; And need certain operating distance, the aerial coil mutual induction amount that RFID label and read write line are asked just obviously can not practical requirement, can have the Ferrite Material of high permeability in the inner insertion of tag antenna coil; With the increase mutual induction amount, thus the little problem of compensating coil xsect.
As shown in Figure 3, be the synoptic diagram that is connected with RFID label antenna equivalent electrical circuit of logical circuit of the temperature sensitive device of the embodiment of the invention, control break-make.Resonant tank by label antenna forms is as shown in the figure, comprises coil inductance (L), the stray capacitance (C of label antenna
p) and shunt capacitance (C
2), its resonance frequency does
Formula C is C
pAnd C
2Parallelly connected equivalent capacity, R
1, R
2Equivalent resistance for circuit internal inductance coil and other devices.M is the variable resistor of the temperature sensitive device of representative, and S is the logical circuit of control break-make.When logical circuit breaks off, temperature sensitive device not with the sky line parallel, this moment be placed on certain following a period of time of temperature levels after, first resonant frequency and the signal intensity of antenna remain unchanged.When logical circuit is connected, a temperature sensitive device and a day line parallel, be placed on certain following a period of time of temperature levels this moment after, antenna is operated under second resonant frequency, its characteristic frequency and signal intensity have one at least and change.
As shown in Figure 4, but the sketch of the passive RFID tags device 40 that changes for embodiment of the invention detected temperatures.As shown in Figure 4, label apparatus 40 comprises 45, one integrated circuit 43 of a base and a double-doublet antenna 41,42.The temperature sensitive device 44 that links to each other with antenna 42 will influence the resistance of antenna 42.The material that temperature sensitive device 44 is suitable for can be controlled the frequency that any one had both been fixed a point according to any one current voltage in the antenna 41,42.With regard to an instance, fixing up an aerial wire 41,42 can make it produce resonance in identical frequency.With regard to another instance, fixing up an aerial wire 41,42 can make it produce resonance in different frequency.
In an example, transmitting terminal double- doublet antenna 41,42 is processed by one or more different low electrical resistant materials; These materials have higher electric conductivity, copper for example, silver; And aluminium, they link to each other with the above-mentioned temperature sensitive device of mentioning, when antenna 41; 42 be placed on certain following a period of time of temperature levels after, temperature sensitive device can cause the variation of one or more transmitting terminal generation resonant frequencies, thereby causes a different frequency.The frequency of the variation of this frequency and reception and transmission is all different.For example, after temperature sensitive device is positioned over certain following a period of time of temperature levels, will causes sending frequency and accept that at least one changes in the frequency.
In another example, the antenna frequencies value of setting at the beginning will be higher than the antenna frequencies under the uniform temperature environment, and when reaching certain temperature, it will reduce then.In another example, the antenna frequencies of setting at the beginning is lower than the temperature sensitive device of thermistor under the uniform temperature 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, and the temperature levels that causes changing possibly be that a specific temperature value also possibly be a scope of temperature value selectively.The length of time must cause the variation of antenna resonance frequency, and antenna quality also can cause different variations.The type of the temperature sensitive device that for example, has on the antenna can influence the length that changes the antenna resonance frequency required time.
Shown in Fig. 5 .1, the thermistor temperature sensor element is made up of thermistor 513 and electrode 511,512.Thermistor is a kind of sensitive element of processing with semiconductor material 513.Its principle of work is to utilize the physical characteristics of bulk resistor marked change with temperature variation of semiconductor material 513 to convert temperature variable to electric weight.That thermal resistance has is highly sensitive, volume is little, making is simple, the life-span is long, working stability, is convenient to realize characteristics such as telemeasurement and control.
Shown in Fig. 5 .2, the temperature sensitive device of bimetallic strip is by bimetallic strip 521, and bimetallic strip 522 and bonding place 523 constitute.Bimetallic strip is to be bonded together 521,522 on two metals with different heat expansion coefficient, constitutes device as shown in the figure.When bimetallic strip receives the higher temperature of specific adhesion temperature, its will be crooked toward the direction, and when it receives the lower temperature of specific adhesion temperature, it will be crooked towards another direction.
As shown in Figure 6, come a kind of method flow diagram of detected temperatures change through the label apparatus that uses many antennas for the embodiment of the invention.What need consider is, the above-mentioned device of mentioning uses a label integrated circuit to carry out and the exchanging of a plurality of antennas.
As shown in Figure 6,50, the RFID reader sends energy and instruction to label apparatus.52, logical circuit is in the state of disconnection at initial time, and label apparatus is with the antenna received energy and the instruction that do not link to each other with temperature sensitive device.54, the electromagnetic wave that label apparatus will carry energy is converted into a DC (direct current) voltage, thereby just can make label carry out the requirement of indication.And this conversion need be used a charge pump, and a rectification circuit perhaps interconnects it, perhaps will use other energy conversion device.56, label apparatus sends signal through the sky alignment reader that does not link to each other with temperature sensitive device.58, the energy intensity of receiving signal is measured and write down to reader.60, reader sends the instruction of connecting logical circuit to label apparatus.62, label apparatus is used the antenna transmission data that link to each other with temperature sensitive device.64, the energy intensity of signal is received in the reader measurement.66, reader calculated goes out the fiducial value of a reaction signal intensity.68, reader changes into the different temperature value with fiducial value.With regard to an instance, reader can be set the signal that a time period is used for receiving label, if do not receive signal, reader will be recorded as 0 with signal intensity.
In this system, reader will compare its signal strength values with the label antenna that links to each other with temperature sensitive device from the signal strength values of the antenna that does not link to each other with temperature sensitive device as a reference value.Through receive from the signal that links to each other with temperature sensitive device with the transmitting terminal that does not link to each other with temperature sensitive device, reader can be collected the fiducial value of representing unlike signal intensity.Then, the RFID reader can be converted into the residing temperature levels of label to such fiducial value.With regard to a concrete instance, disposing this RFID reader is to be converted into temperature value for the difference from the RF signal intensity that connects the antenna that does not perhaps connect temperature sensitive device that will receive through the reference data of using storage.
Best situation is, with the antenna that does not connect temperature sensitive device as a reference, can be with owing to the variation that coupling caused between label and the reader filters out.In addition, as before mention, temperature sensitive device is applied to the time length that variation and the label of the resistance value that can make it in the design be placed under the specified temp and forms relation one to one.For example, temperature sensitive device is only positioned on an antenna, can allow like this to change within the specific limits as a kind of function from the signal of RFID label apparatus, and this function just antenna be placed on the function that just has after the time under the uniform temperature.The same, the application of the invention, under the passive condition of RFID label, the RFID reader can detect label apparatus whether be placed under certain temperature and this temperature whether within the acceptable range.
Do not use the various RFID labels of two antennas also can perceive variation of temperature with temperature sensitive device, the variation that the variation of sense temperature is based on resonant frequency on the antenna also can recognize the variation that antenna receives signal.
For example pass through design to the antenna that links to each other with temperature sensitive device; The frequency that can make antenna is at ISM (Industrial Scientific Medical; Industry, science, medical science) the interior variation of frequency range, can connect the antenna that this and temperature sensitive device and logical circuit link to each other on the label of standard.
For example label antenna can so be set in a concrete instance; Before in being exposed to the uniform temperature environment; The resonant frequency of antenna is 902-928MHZ, but in a single day label is exposed in the uniform temperature environment, because Influence of Temperature; The resonant frequency of antenna is just reduced to 899.5-927.5MHZ; Frequency frequency range (902-928MHZ) at U.S. RFID is split into 52 channels, and reader can be skipped the channel that can not receive at random in these 52 channels, and the benefit of this jump of reader is exactly to prevent effectively that a plurality of readers from attempting the conflict of using same frequency to cause in same physical space.
For example in an example, RFID frequency range (902-928MHZ) is not to be divided into 52 channels but the antenna settings that on average has been divided into n channel tag is carried out work under this frequency range (902-928MHZ).Because label antenna links to each other with temperature sensitive device, so as long as temperature has surpassed the scope of predefined value, the frequency of operation of antenna tag antenna just drops among (899.5-927.5MHZ) this frequency range.Therefore compare just channel n to be got rid of from band limits with original frequency range and go, the frequency range (899.5-927.5MHZ) after therefore changing is carried out exchanging of information with regard to no longer allowing label with channel n.
In concrete instance; If the environment at label place has surpassed the temperature range of expection; Reader can only send instruction to label through channel 1 to n-1; Label also can be made a response because the antenna in the label just can only work in this frequency range, when reader with the frequency of n channel when label sends instruction; So no longer reach the 928MHZ label and just no longer make a response because the label variation of temperature has caused the resonant frequency of label antenna to drop to 899.5-927.5MHZ, pass information back reader.
Favourable aspect is just to be reflected by the disappearance of this information interchange owing to variation that temperature has exceeded the operating frequency of antenna that predefined value causes.
In model; Reader can send an instruction between channel n-1 and channel n to label and further check that drift has taken place the operating frequency range of label antenna; Because label can receive the instruction that sends through channel n-1; And can be to the reader feedback information through channel n-1; Because label can not receive the instruction that sends through channel n, and can not can so just confirm that drift has taken place the operating frequency range of label antenna to the reader feedback information through channel n.
Variation of temperature causes the frequency of operation of label antenna to take place upwards to be not limited in downward drift and present invention frequency range on average is divided into n channel.
The embodiment of the invention can come detected temperatures to change at lower cost, and the energy that utilizes RFID to obtain, and has solved the powerup issue of temperature detection.
The enforcement of each characteristics of this system may relate to software; The combination that hardware also possibly relate to software and hardware just can reach, and for example the enforcement of many advantages of system is to realize with the mutual mode that exchanges of computer and other equipment machines with object oriented programming languages with a kind of high-caliber processing through programming.Each such function program for example possibly be stored in the storage intermediary in the ROM (read-only memory) to be read by a computer and processor and realize above-mentioned function.
Those skilled in the art can also recognize the various illustrative components, blocks (illustrative logical block) that the embodiment of the invention is listed, and unit and step can be passed through electronic hardware, computer software, or both combinations realize.Be the clear replaceability (interchangeability) of showing hardware and software, above-mentioned various illustrative components (illustrative components), unit and step have been described their function generally.Such function is to realize depending on the designing requirement of certain applications and total system through hardware or software.Those skilled in the art can be for every kind of certain applications, and can make ins all sorts of ways realizes described function, but this realization should not be understood that to exceed the scope of embodiment of the invention protection.
Various illustrative logical block described in the embodiment of the invention; Or the unit can pass 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 above-mentioned any combination realizes or operates described function.General processor can be microprocessor, and alternatively, this general processor also can be any traditional processor, controller, microcontroller or state machine.Processor also can realize through the combination of calculation element, for example digital signal processor and microprocessor, a plurality of microprocessors, Digital Signal Processor Core of one or more microprocessors associatings, or any other similarly configuration realize.
The method described in the embodiment of the invention or the step of algorithm can directly embed hardware, the software module of processor execution or the two combination.Software module can be stored in the storage medium of other arbitrary form in RAM storer, flash memory, ROM storer, eprom memory, eeprom memory, register, hard disk, moveable magnetic disc, CD-ROM or this area.Exemplarily, storage medium can be connected with processor, so that processor can read information from storage medium, and can deposit write information to storage medium.Alternatively, storage medium can also be integrated in the processor.Processor and storage medium can be arranged among the ASIC, and ASIC can be arranged in the user terminal.Alternatively, processor and storage medium also can be arranged in the various parts in the user terminal.
In one or more exemplary designs, the described above-mentioned functions of the embodiment of the invention can realize in hardware, software, firmware or this three's combination in any.If in software, realize, these functions can be stored on the media with computer-readable, or are transmitted on the media of computer-readable with one or more instructions or code form.The computer-readable media comprises that the computer storage medium lets computer program transfer to other local telecommunication media from a place with being convenient to make.Storage medium can be the useable medium that any general or special computer can access.For example; 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 can be used to carry or store with instruction or data structure and other can be read the media of the program code of form by general or special computer or general or special processor.In addition; Any connection can suitably be defined as the computer-readable media; For example, if software is through a concentric cable, optical fiber computer, twisted-pair feeder, Digital Subscriber Line (DSL) or also being comprised in the defined computer-readable media with wireless mode transmission such as for example infrared, wireless and microwaves from a web-site, server or other remote resource.Described video disc (disk) and disk (disc) comprise Zip disk, radium-shine dish, CD, DVD, floppy disk and Blu-ray Disc, and disk is usually with the magnetic duplication data, and video disc carries out the optical reproduction data with laser usually.Above-mentioned combination also can be included in the computer-readable media.
Above-described embodiment; The object of the invention, technical scheme and beneficial effect have been carried out further explain, and institute it should be understood that the above is merely embodiment of the present invention; And be not used in qualification protection scope of the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. the RFID label with temperature sensitive device is characterized in that, two pins are arranged on the chip of said RFID label; Two pins of said temperature sensitive device and this link to each other; And form parallel-connection structure with the antenna of said RFID label; The variation of ambient temperature can cause the changes in resistance of temperature sensitive device own, and the logical circuit of a control break-make is arranged on said temperature sensitive device and circuit that the chip of RFID label is connected, and the circuit of this connection is the part of chip with the logical circuit of control break-make; The break-make of logical circuit determined temperature sensitive device whether with the sky line parallel: when logical circuit breaks off; Temperature sensitive device not with the sky line parallel, this moment be placed on certain following a period of time of temperature levels after, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit is connected, a temperature sensitive device and a day line parallel, be placed on certain following a period of time of temperature levels this moment after, the characteristic frequency of antenna and signal intensity have one at least and change, antenna is operated under second resonant frequency at this moment; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes coming from the difference between the signal intensity of the different frequency of antenna through comparison the change of detected temperatures.
2. according to claim 1 with the RFID label of temperature sensitive device, it is characterized in that the antenna of said RFID label is a monopole antenna.
3. according to claim 1 with the RFID label of temperature sensitive device, it is characterized in that the antenna of said RFID label is a double-doublet antenna: said temperature sensitive device forms parallel-connection structure with antenna wherein; Perhaps said temperature sensitive device and two antennas form parallel-connection structure simultaneously.
4. according to claim 1 with the RFID label of temperature sensitive device, it is characterized in that said temperature sensitive device is the temperature sensitive device of resistor-type, said temperature sensitive device comprises: the temperature sensitive device of thermistor, the temperature sensitive device of double-metal sheet type, the temperature sensitive device of condenser type.
5. the RFID label with temperature sensitive device is characterized in that, a pin is arranged on the chip of said RFID label; One end of said temperature sensitive device links to each other with this pin; The other end is connected on the antenna of said RFID label; And form parallel-connection structure with antenna; The variation of ambient temperature can cause the changes in resistance of temperature sensitive device own, and the logical circuit of a control break-make is arranged on said temperature sensitive device and circuit that the chip of RFID label is connected, and the circuit of this connection is the part of chip with the logical circuit of control break-make; The break-make of logical circuit determined temperature sensitive device whether with the sky line parallel: when logical circuit breaks off; Temperature sensitive device not with the sky line parallel, this moment be placed on certain following a period of time of temperature levels after, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit is connected, a temperature sensitive device and a day line parallel, be placed on certain following a period of time of temperature levels this moment after, the characteristic frequency of antenna and signal intensity have one at least and change, antenna is operated under second resonant frequency at this moment; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes coming from the difference between the signal intensity of the different frequency of antenna through comparison the change of detected temperatures.
6. like the said RFID label of claim 5, it is characterized in that the antenna of said RFID label is a monopole antenna with temperature sensitive device.
7. like the said RFID label with temperature sensitive device of claim 5, it is characterized in that the antenna of said RFID label is a double-doublet antenna: said temperature sensitive device forms parallel-connection structure with antenna wherein; Perhaps said temperature sensitive device and two antennas form parallel-connection structure simultaneously.
8. like the said RFID label with temperature sensitive device of claim 5, it is characterized in that said temperature sensitive device is the temperature sensitive device of resistor-type, the temperature sensitive device of said resistor-type comprises: the temperature sensitive device of thermistor, the temperature sensitive device of double-metal sheet type, the temperature sensitive device of condenser type.
9. RFID label with temperature sensitive device; It is characterized in that; Said temperature sensitive device is connected on the antenna of said RFID label, and forms parallel-connection structure with antenna, and the variation of ambient temperature can cause the changes in resistance of temperature sensitive device own; The logical circuit that a control break-make is arranged on said temperature sensitive device and circuit that antenna is connected; The circuit of this connection is the part of chip with the logical circuit of control break-make, the break-make of logical circuit determined temperature sensitive device whether with the sky line parallel: when logical circuit breaks off, temperature sensitive device not with the sky line parallel; After being placed on certain following a period of time of temperature levels, first resonant frequency and the signal intensity of antenna remain unchanged this moment; When logical circuit is connected, a temperature sensitive device and a day line parallel, be placed on certain following a period of time of temperature levels this moment after, the characteristic frequency of antenna and signal intensity have one at least and change, antenna is operated under second resonant frequency at this moment; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes coming from the difference between the signal intensity of the different frequency of antenna through comparison the change of detected temperatures.
10. like the said RFID label of claim 9, it is characterized in that the antenna of said RFID label is a monopole antenna with temperature sensitive device.
11. like the said RFID label with temperature sensitive device of claim 9, it is characterized in that the antenna of said RFID label is a double-doublet antenna: said temperature sensitive device forms parallel-connection structure with antenna wherein; Perhaps said temperature sensitive device and two antennas form parallel-connection structure simultaneously.
12., it is characterized in that said temperature sensitive device is the temperature sensitive device of resistor-type like the said RFID label with temperature sensitive device of claim 9, the temperature sensitive device of said resistor-type comprises: the temperature sensitive device of thermistor, the temperature sensitive device of double-metal sheet type, the temperature sensitive device of condenser type.
13. the rfid system with temperature sensitive device, said rfid system comprises RFID label and RFID reader, it is characterized in that,
Said RFID label comprises each said RFID label with temperature sensitive device among the claim 1-4, or each said RFID label with temperature sensitive device among the claim 5-8, or each said RFID label with temperature sensitive device among the claim 9-12;
Said RFID reader sends the break-make of instruction with the logical circuit of control RFID label, thereby comes the change of detected temperatures from the difference between the signal intensity of the different frequency of antenna through comparison.
14. the temperature checking method with the rfid system of temperature sensitive device is characterized in that, said temperature checking method is applied to the said rfid system with temperature sensitive device of claim 13, comprising:
Send the break-make of instruction through said RFID reader with the logical circuit of control RFID label;
Receive the break-make of the instruction of RFID reader transmission through the RFID label: when logical circuit breaks off with control logic circuit; Temperature sensitive device not with the sky line parallel; Be placed on this moment under certain temperature strength, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, temperature sensitive device was placed under certain temperature strength with a day line parallel, this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency;
Utilize the comparison of said RFID reader to come the change of detected temperatures from the difference between the signal intensity of the different frequency of antenna.
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| Application Number | Priority Date | Filing Date | Title |
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| 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 |
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| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN109390683A (en) * | 2017-08-10 | 2019-02-26 | 台扬科技股份有限公司 | Antenna assembly and its circuit board |
| 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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| CN101383020A (en) * | 2008-10-14 | 2009-03-11 | 厦门大学 | Environment sensitive type passive electronic label |
| US20100079288A1 (en) * | 2008-09-30 | 2010-04-01 | Timothy Collins | RFID Tag Device with Temperature Sensitive Antenna |
| 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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| US20100079288A1 (en) * | 2008-09-30 | 2010-04-01 | Timothy Collins | RFID Tag Device with Temperature Sensitive Antenna |
| CN101383020A (en) * | 2008-10-14 | 2009-03-11 | 厦门大学 | Environment sensitive type passive electronic label |
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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 |
| CN109390683A (en) * | 2017-08-10 | 2019-02-26 | 台扬科技股份有限公司 | Antenna assembly and its circuit board |
| 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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| CN102722746B (en) | 2016-09-21 |
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