CN117744680A - Radio frequency identification tag, temperature detection system and temperature detection method - Google Patents
Radio frequency identification tag, temperature detection system and temperature detection method Download PDFInfo
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Abstract
The invention discloses a radio frequency identification tag, a temperature detection system and a temperature detection method, wherein the radio frequency identification tag comprises: the system comprises an antenna, an energy acquisition circuit, a basic tag identification circuit, a time domain temperature sensing circuit, a signal selector and a signal output circuit; the time domain temperature sensing circuit is used for responding to the temperature detection instruction received through the antenna, generating a time domain temperature signal and transmitting the time domain temperature signal to the signal selector; and the signal selector is used for selecting to transmit the tag baseband signal or the time domain temperature signal to the antenna through the signal output circuit to be transmitted outwards according to the type of the instruction received through the antenna. The technical scheme provided by the invention can be used for detecting the temperature in the tag in a long distance, and the efficiency and quality of temperature detection are improved.
Description
Technical Field
The invention relates to the field of data transmission, in particular to a radio frequency identification tag with an embedded temperature detection function, a temperature detection system and a temperature detection method.
Background
RFID (Radio Frequency Identification) the system is mainly used for identifying people and things. Generally, the system includes at least one RFID reader capable of transmitting and receiving radio frequency signals from one or more RFID tags within a set range. Meanwhile, temperature detection is the most common measurement in daily life, industrial process and supply chain, and with the increasing of the integrated functions in the tag, the heating of a circuit becomes a non-negligible problem, so that the temperature detection in the tag becomes a necessary measure in the use process of the tag, and further, as the complexity of the circuit in the tag is increased, the temperature detection requirement of low power consumption and low cost becomes a necessary requirement.
The current label temperature detection mainly adopts a temperature detection device which is additionally arranged outside the label, or directly adopts infrared temperature sensing detection to detect the temperature in the label from the outside of the label, and the detection mode can not accurately detect the temperature in the label, so that the detection error is large; or a voltage domain temperature sensor is adopted in the tag To detect the temperature in the tag, but the high power consumption of an Analog-To-Digital Converter (digital-To-Analog) circuit of the voltage domain temperature sensor can cause the communication distance of the UHF (Ultra High Frequency ) RFID tag To be greatly reduced, and the UHF RFID tag cannot be used for acquiring remote temperature information.
Disclosure of Invention
The invention provides a radio frequency identification tag, a temperature detection system and a temperature detection method, wherein the radio frequency identification tag can accurately acquire real-time temperature in the tag, the temperature detection accuracy is improved, and meanwhile, the power consumption of a temperature detection circuit in the radio frequency identification tag is small, and a detected temperature signal can be transmitted for a long distance.
In a first aspect, an embodiment of the present invention provides a radio frequency identification tag, including: the system comprises an antenna, an energy acquisition circuit, a basic tag identification circuit, a time domain temperature sensing circuit, a signal selector and a signal output circuit;
the input end of the energy acquisition circuit is connected with the antenna, and the output end of the energy acquisition circuit is respectively connected with the basic tag identification circuit and the time domain temperature sensing circuit; the output ends of the basic tag identification circuit and the time domain temperature sensing circuit are respectively connected with the input end of the signal selector, and the output end of the signal selector is connected with an antenna through a signal output circuit; the energy acquisition circuit is used for acquiring energy from the antenna and activating the basic tag identification circuit and the time domain temperature sensing circuit by using the acquired energy;
the basic tag identification circuit is used for identifying a control instruction received through an antenna, generating a tag baseband signal when the control instruction is determined to be the basic tag identification instruction, transmitting the tag baseband signal to the signal selector, and triggering the time domain temperature sensing circuit to generate a time domain temperature signal with set duration when the control instruction is determined to be a temperature detection instruction;
the time domain temperature sensing circuit is used for responding to the control of the basic tag identification circuit, generating a time domain temperature signal with set duration and transmitting the time domain temperature signal to the signal selector;
the signal selector is used for selecting to transmit the tag baseband signal or the time domain temperature signal to the antenna through the signal output circuit to be sent outwards according to the instruction type of the control instruction.
In a second aspect, an embodiment of the present invention provides a temperature detection system, including: the radio frequency identification tag with embedded temperature detection function and the reader according to any one of the embodiments of the invention;
the reader is used for sending a temperature detection instruction and a pre-setting command to the radio frequency identification tag and receiving a time domain temperature signal fed back by the radio frequency identification tag aiming at the temperature detection instruction and the pre-setting command; determining the temperature in the radio frequency identification tag according to the time domain temperature signal; and
the reader is further used for sending a basic tag identification instruction to the radio frequency identification tag, receiving a tag baseband signal fed back by the radio frequency identification tag aiming at the basic tag identification instruction, and identifying tag information carried in the radio frequency identification tag according to the tag baseband signal.
In a third aspect, an embodiment of the present invention provides a temperature detection method, including:
sending a temperature detection instruction and a pre-setting command to the radio frequency identification tag;
the radio frequency identification tag is used for determining a temperature detection duration according to the preset setting command, and controlling an internal time domain temperature sensing circuit to generate a corresponding time domain temperature signal according to the temperature detection command, the temperature in the tag and the temperature detection duration;
receiving a time domain temperature signal fed back by the radio frequency identification tag aiming at the temperature detection instruction; determining the temperature in the radio frequency identification tag according to the time domain temperature signal;
transmitting a basic tag identification instruction to the radio frequency identification tag;
receiving a tag baseband signal fed back by the radio frequency identification tag aiming at the basic tag identification instruction, and identifying tag information carried in the radio frequency identification tag according to the tag baseband signal.
The embodiment of the invention provides a radio frequency identification tag, a temperature detection system and a temperature detection method, wherein the radio frequency identification tag comprises: the system comprises an antenna, an energy acquisition circuit, a basic tag identification circuit, a time domain temperature sensing circuit, a signal selector and a signal output circuit; the input end of the energy acquisition circuit is connected with the antenna, and the output end of the energy acquisition circuit is respectively connected with the basic tag identification circuit and the time domain temperature sensing circuit; the output ends of the basic tag identification circuit and the time domain temperature sensing circuit are respectively connected with the input end of the signal selector, and the output end of the signal selector is connected with an antenna through a signal output circuit; the energy acquisition circuit is used for acquiring energy from the antenna and activating the basic tag identification circuit and the time domain temperature sensing circuit by using the acquired energy; the basic tag identification circuit is used for identifying a control instruction received through an antenna, generating a tag baseband signal when the control instruction is determined to be the basic tag identification instruction, transmitting the tag baseband signal to the signal selector, and triggering the time domain temperature sensing circuit to generate a time domain temperature signal with set duration when the control instruction is determined to be a temperature detection instruction; the time domain temperature sensing circuit is used for responding to the control of the basic tag identification circuit, generating a time domain temperature signal with set duration and transmitting the time domain temperature signal to the signal selector; the signal selector is used for selecting to transmit the tag baseband signal or the time domain temperature signal to the antenna through the signal output circuit to be sent outwards according to the type of the instruction received through the antenna. According to the radio frequency identification tag provided by the embodiment of the invention, the temperature in the tag can be detected through the radio frequency identification tag, the time domain temperature signal is generated, the temperature in the tag is accurately obtained through analyzing the time domain temperature signal, meanwhile, the power consumption of the internal temperature detection circuit of the tag is lower, and the generated time domain temperature signal can be transmitted for a long distance, so that a worker can remotely determine the real-time temperature in the tag, the efficiency and the accuracy of the temperature detection in the tag are improved, and the energy consumption required by the temperature detection in the tag is saved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a radio frequency identification tag according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a radio frequency identification tag according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a temperature detection system according to a second embodiment of the present invention
FIG. 4 is a schematic diagram of a temperature detection system according to an embodiment of the present invention;
fig. 5 is a flowchart of a temperature detection method according to a third embodiment of the present invention;
fig. 6 is a schematic structural diagram of a temperature detecting device according to a fourth embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Fig. 1 is a schematic structural diagram of an rfid tag according to a first embodiment of the present invention, as shown in fig. 1, the rfid tag includes: the system comprises an antenna 110, an energy acquisition circuit 120, a basic tag identification circuit 130, a time domain temperature sensing circuit 150, a signal selector 140 and a signal output circuit 160, wherein the input end of the energy acquisition circuit 120 is connected with the antenna 110, and the output end is respectively connected with the basic tag identification circuit 130 and the time domain temperature sensing circuit 150; the outputs of the basic tag identification circuit 130 and the time-domain temperature sensing circuit 150 are respectively connected to the input of the signal selector 140, and the output of the signal selector 140 is connected to the antenna 110 through the signal output circuit 160.
An energy harvesting circuit 120 for harvesting energy from the antenna 110 and using the harvested energy to activate the base tag identification circuit 130 and the time domain temperature sensing circuit 150;
the basic tag recognition circuit 130 recognizes the control command received through the antenna 110, generates a tag baseband signal when the control command is determined as the basic tag recognition command, transmits the tag baseband signal to the signal selector 140, and triggers the time domain temperature sensing circuit 150 to generate a time domain temperature signal of a set duration when the control command is determined as the temperature detection command;
the time domain temperature sensing circuit 150 is configured to identify a control instruction received through the antenna 110, generate a tag baseband signal when determining that the control instruction is a basic tag identification instruction, transmit the tag baseband signal to the signal selector 140, and trigger the time domain temperature sensing circuit 150 to generate a time domain temperature signal with a set duration when determining that the control instruction is a temperature detection instruction;
the signal selector 140 is configured to select to transmit the tag baseband signal or the time domain temperature signal to the antenna 110 through the signal output circuit 160 for sending outwards according to the type of the instruction received through the antenna 110.
Specifically, the antenna 110 may receive a basic tag identification instruction and/or a temperature detection instruction sent by an instruction sending device, where the sending device may be a reader based on EPC Gen2 (Electronic Product Code Generation, remote high performance communication protocol) protocol, the basic tag identification instruction is used to trigger the radio frequency identification tag to complete a basic tag function, such as data communication, transmission, etc., the temperature detection instruction is used to trigger a temperature detection function of the time domain temperature sensing circuit 150, and the signal selector 140 may be a backscatter switch selector.
Alternatively, the tag baseband signal generated by the base tag identification circuit 130 is a baseband signal based on EPC Gen2 protocol.
Specifically, the radio frequency identification tag can have other tag basic functions besides the function of detecting temperature, so that the tag baseband signal meets the basic protocol of the radio frequency identification tag, namely, the tag baseband signal is a baseband signal meeting the EPC Gen2 protocol.
Optionally, the temperature detection instruction is a write instruction for setting a storage address in the radio frequency identification tag.
Specifically, a write instruction may be set in the radio frequency identification tag to set a storage address, so as to trigger a temperature detection function of the time domain temperature sensing circuit, further, the write instruction is only one trigger instruction provided in the embodiment of the present invention, and the trigger instruction of the time domain temperature sensing circuit may be one or more different instructions, such as a read instruction, a data modification instruction, or the like, which is not limited herein.
Optionally, the basic tag identification circuit 130 specifically includes a duration detection sub-circuit, where the duration detection sub-circuit is connected to the time domain temperature sensing circuit;
the time length detection sub-circuit 150 is configured to determine a temperature detection time length according to a preset temperature detection command, and control a time length of the time domain temperature sensing circuit for detecting a temperature according to the temperature detection time length;
the time domain temperature sensing circuit 150 is configured to detect the temperature in the tag under the control of the time duration detection sub-circuit, and generate a time domain temperature signal according to the temperature in the tag.
The time domain temperature sensing circuit may include a temperature sensor, where the temperature sensor may be a time domain temperature sensor, the time domain temperature sensor may convert an acquired temperature signal into a time domain temperature signal, and further, by analyzing the time domain temperature signal, the temperature of the detected object may be determined, and further, since determining the temperature of the detected object needs information such as a period, a frequency, a wavelength, and the like of the time domain temperature signal, the time duration detection sub-circuit is used to control the working time duration of the time domain temperature sensor, so that the temperature sensor may be controlled to generate a time domain temperature signal that is continuously stable and is determined in time duration, and further, the temperature of the detected object may be determined by analyzing the time domain temperature signal. Further, the temperature detection duration may be specifically determined by the tag operating site and/or the specific circuit environment, and is not limited herein.
Optionally, the time domain temperature sensing circuit 150 specifically includes: a linear voltage regulator and a programmable ring oscillator;
the linear voltage stabilizer is used for converting the temperature signal in the tag into a voltage signal;
the programmable ring oscillator is used for converting temperature information into frequency information of a time domain and generating an oscillating signal with frequency sensitive to temperature.
Exemplary, fig. 2 is a schematic structural diagram of a radio frequency identification tag according to an embodiment of the present invention, where a time domain temperature sensor and a backscatter switch selector are added to the radio frequency identification tag based on an original tag circuit, and a complex readout circuit design similar to a voltage domain temperature sensor is not required, and a readout strategy is well compatible with a backscatter switch; meanwhile, as the added basic modules are the linear voltage stabilizer, the ring oscillator and the back scattering switch selector, the area cost is small, and the power consumption cost is less than 0.1uW, thereby realizing the design of the passive wireless temperature sensing tag with ultralow cost and ultralow power consumption.
The working principle of the embodiment of the invention is that a temperature detection instruction, a basic tag identification instruction and energy are acquired through an antenna 110, a time domain temperature sensing circuit 150 is activated by using the acquired energy and the temperature detection instruction, a basic tag identification circuit 130 is activated by using the acquired energy and the basic tag identification instruction, further, the time domain temperature sensing circuit 150 generates a time domain temperature signal according to the temperature detection instruction and transmits the time domain temperature signal to a signal selector 140; the base tag identification circuit 130 generates a tag baseband signal according to the base tag identification instruction. The signal selector 140 selects to transmit the tag baseband signal or the time domain temperature signal to the antenna 110 through the signal output circuit 160 for transmission according to the type of the instruction received by the antenna 110. Further, the temperature detection duration can be determined through a preset command received by the radio frequency identification tag, and the time duration of the temperature detection of the time domain temperature sensing circuit is controlled according to the temperature detection duration. The radio frequency identification tag of the embodiment completes temperature detection work in the tag through the circuit and the module, specifically, the power consumption of an internal circuit of the radio frequency identification tag is low, and the generated time domain temperature signal can be transmitted for a long distance, so that a worker can remotely determine the real-time temperature in the tag, the efficiency of temperature detection in the tag is improved, and the energy consumption required by the temperature detection circuit in the tag is saved.
Example two
Fig. 3 is a schematic structural diagram of a temperature detection system according to a second embodiment of the present invention, where the system includes an rfid tag 310 and a reader 320 with embedded temperature detection functions in the above embodiment; the reader 320 is configured to send a temperature detection instruction and a preset command to the rfid tag 310, and receive a time-domain temperature signal fed back by the rfid tag 310 for the temperature detection instruction and the preset command; determining the temperature in the radio frequency identification tag according to the time domain temperature signal; and
the reader 320 is further configured to send a basic tag identification instruction to the radio frequency identification tag 310, receive a tag baseband signal fed back by the radio frequency identification tag 310 for the basic tag identification instruction, and identify tag information carried in the radio frequency identification tag according to the tag baseband signal.
Alternatively, the reader 320 is an EPC Gen2 protocol based reader 320.
Specifically, the reader 320 may send a temperature detection instruction to the rfid tag 310, analyze a time domain temperature signal fed back by the rfid tag 310 for the temperature detection instruction, and determine the temperature in the tag according to the analysis result; furthermore, mathematical calculation can be performed according to the duration, frequency, waveform and other data of the time domain temperature signal, and the temperature in the tag can be determined according to the calculation result. The reader 320 may send a basic tag identification instruction to the radio frequency identification tag 310, analyze a tag baseband signal returned by the radio frequency identification tag 310, and complete an information interaction task according to the analysis result.
Specifically, a high-precision reference source can be comprehensively generated by the crystal oscillator in the reader 320, the received oscillation waveforms are counted, and the stable wave band is intercepted to obtain the average frequency value of a fixed time interval (for example, 4ms,8ms and 10 ms), so that the temperature in the tag is determined.
Fig. 4 is a schematic diagram of a temperature detection system according to an embodiment of the present invention, where a reader may send a write instruction to an 81H address of a register in a tag, and further a time domain temperature sensing circuit in the tag triggers a temperature detection function, performs a temperature detection signal in the tag, returns an oscillation waveform of a preset duration to the reader, and the reader may determine a temperature in the tag by analyzing the returned oscillation waveform.
Optionally, the basic tag identification circuit specifically includes a duration detection sub-circuit, and the duration detection sub-circuit is connected with the time domain temperature sensing circuit;
the time length detection sub-circuit is used for determining the temperature detection time length according to a preset temperature detection command and controlling the time length of the time domain temperature sensing circuit for detecting the temperature according to the temperature detection time length;
the time domain temperature sensing circuit is used for detecting the temperature in the tag under the control of the time length detection sub-circuit and generating a time domain temperature signal according to the temperature in the tag.
Optionally, the time domain temperature sensing circuit specifically includes: a linear voltage regulator and a programmable ring oscillator;
the linear voltage stabilizer is used for converting the temperature signal in the tag into a voltage signal;
and the programmable ring oscillator is used for converting the temperature information into frequency information of a time domain and generating an oscillating signal with frequency sensitive to temperature.
Alternatively, the temperature detection instruction is a write instruction to set a memory address in the rfid tag 310.
The embodiment of the invention provides a temperature detection system, which comprises a radio frequency identification tag with embedded temperature detection function and a reader; the reader is used for sending a temperature detection instruction to the radio frequency identification tag and receiving a time domain temperature signal fed back by the radio frequency identification tag aiming at the temperature detection instruction; determining the temperature in the radio frequency identification tag according to the time domain temperature signal; and the reader is also used for sending a basic tag identification instruction to the radio frequency identification tag, receiving a tag baseband signal fed back by the radio frequency identification tag aiming at the basic tag identification instruction, and identifying tag information carried in the radio frequency identification tag according to the tag baseband signal. Further, the radio frequency identification tag with the embedded temperature detection function in the system detects the temperature in the tag, meanwhile, the power consumption of an internal circuit of the radio frequency identification tag is low, and the generated time domain temperature signal can be transmitted for a long distance, so that a worker can remotely determine the real-time temperature in the tag, the efficiency of temperature detection in the tag is improved, and the energy consumption required by temperature detection in the tag is saved. Further, the reader can send a basic tag identification instruction and/or a temperature detection instruction, receive a tag baseband signal and/or a time domain temperature signal corresponding to the basic tag identification instruction and/or the temperature detection instruction, further complete a temperature detection task in a data transmission task tag by analyzing the tag baseband signal and/or the time domain temperature signal, and can remotely receive the time domain temperature signal and analyze the time domain temperature signal to further accurately determine the temperature in the tag.
Example III
Fig. 5 is a flowchart of a temperature detection method according to a third embodiment of the present invention, where the method may be applied to the case of temperature detection in a tag, and may specifically be executed by a reader in the temperature detection system in the foregoing embodiment.
Specifically, fig. 5 includes:
s510, sending a temperature detection instruction and a pre-setting command to the radio frequency identification tag;
the radio frequency identification tag is used for determining a temperature detection duration according to the preset setting command, and controlling an internal time domain temperature sensing circuit to generate a corresponding time domain temperature signal according to the temperature detection command, the temperature in the tag and the temperature detection duration;
s520, receiving a time domain temperature signal fed back by the radio frequency identification tag aiming at the temperature detection instruction; and determining the temperature in the radio frequency identification tag according to the time domain temperature signal.
S530, transmitting a basic tag identification instruction to the radio frequency identification tag.
S540, receiving a tag baseband signal fed back by the radio frequency identification tag aiming at the basic tag identification instruction, and identifying tag information carried in the radio frequency identification tag according to the tag baseband signal.
Optionally, sending a temperature detection instruction for generating a time length detection temperature signal to the radio frequency identification tag;
determining the temperature in the radio frequency identification tag according to the time domain temperature signal, comprising:
according to the time domain temperature signal of the set time length fed back by the radio frequency identification tag, calculating the frequency of an oscillator used by a temperature sensor in the radio frequency identification tag;
and determining the temperature in the radio frequency identification tag according to the frequency of the oscillator.
Optionally, the temperature detection instruction is a write instruction for writing setting information into a setting storage address of the radio frequency identification tag.
Specifically, a temperature detection instruction can be sent to the radio frequency identification tag through the reader, temperature detection is further performed through the radio frequency identification tag, a time domain temperature signal returned by the radio frequency identification tag is received, and then information such as the frequency, the waveform and the period of an oscillator of the time domain temperature signal is determined through analyzing the time domain temperature signal, and further the temperature in the tag is determined according to the analyzed information.
Specifically, a basic tag identification instruction can be sent to the radio frequency identification tag through the reader, a data communication task aiming at the basic tag identification instruction is further completed through the radio frequency identification tag, a tag baseband signal returned by the radio frequency identification tag is received, and tag information carried in the radio frequency identification tag is identified according to the tag baseband signal.
Optionally, the basic tag identification circuit specifically includes a duration detection sub-circuit, and the duration detection sub-circuit is connected with the time domain temperature sensing circuit;
the time length detection sub-circuit is used for determining the temperature detection time length according to a preset temperature detection command and controlling the time length of the time domain temperature sensing circuit for detecting the temperature according to the temperature detection time length;
the time domain temperature sensing circuit is used for detecting the temperature in the tag under the control of the time length detection sub-circuit and generating a time domain temperature signal according to the temperature in the tag.
Optionally, the time domain temperature sensing circuit specifically includes: a linear voltage regulator and a programmable ring oscillator;
the linear voltage stabilizer is used for converting the temperature signal in the tag into a voltage signal;
and the programmable ring oscillator is used for converting the temperature information into frequency information of a time domain and generating an oscillating signal with frequency sensitive to temperature.
Optionally, the tag baseband signal generated by the base tag identification circuit is a baseband signal based on EPC Gen2 protocol.
Optionally, the temperature detection instruction is a write instruction for setting a storage address in the radio frequency identification tag.
The embodiment of the invention provides a temperature detection method, which comprises the steps of sending a temperature detection instruction and a pre-set command to a radio frequency identification tag; receiving a time domain temperature signal fed back by the radio frequency identification tag aiming at the temperature detection instruction; determining the temperature in the radio frequency identification tag according to the time domain temperature signal; transmitting a basic tag identification instruction to the radio frequency identification tag; receiving a tag baseband signal fed back by the radio frequency identification tag aiming at the basic tag identification instruction, and identifying tag information carried in the radio frequency identification tag according to the tag baseband signal. By the method, the temperature in the radio frequency identification tag can be detected, meanwhile, the power consumption of an internal circuit of the radio frequency identification tag is low, and the generated time domain temperature signal can be transmitted for a long distance, so that a worker can remotely determine the real-time temperature in the tag, the efficiency of temperature detection in the tag is improved, and the energy consumption required by temperature detection in the tag is saved. Further, the reader can send a temperature detection instruction and receive a time domain temperature signal corresponding to the temperature detection instruction, so that a temperature detection task is completed by analyzing the time domain temperature signal, the reader can remotely receive the time domain temperature signal and analyze the time domain temperature signal, and further, the temperature in the tag can be accurately determined.
Example IV
Fig. 6 is a schematic structural diagram of a temperature detection device according to a fourth embodiment of the present invention, where the device may be used to perform the temperature detection method in the foregoing embodiment, and specifically the device includes: a first transmitting module 610, a temperature determining module 620, a second transmitting module 630 and a tag information determining module 640.
The first sending module 610 sends a temperature detection instruction and a pre-setting command to the rfid tag;
the radio frequency identification tag is used for determining a temperature detection duration according to the preset setting command, and controlling an internal time domain temperature sensing circuit to generate a corresponding time domain temperature signal according to the temperature detection command, the temperature in the tag and the temperature detection duration;
a temperature determining module 620, configured to receive a time-domain temperature signal fed back by the radio frequency identification tag for the temperature detection instruction; determining the temperature in the radio frequency identification tag according to the time domain temperature signal;
a second sending module 630, configured to send a basic tag identification instruction to the radio frequency identification tag;
the tag information determining module 640 is configured to receive a tag baseband signal fed back by the radio frequency identification tag according to the basic tag identification instruction, and identify tag information carried in the radio frequency identification tag according to the tag baseband signal.
The embodiment of the invention provides a temperature detection method, which comprises the steps of sending a temperature detection instruction and a pre-set command to a radio frequency identification tag; the radio frequency identification tag is used for determining a temperature detection duration according to the preset setting command, and controlling an internal time domain temperature sensing circuit to generate a corresponding time domain temperature signal according to the temperature detection command, the temperature in the tag and the temperature detection duration; receiving a time domain temperature signal fed back by the radio frequency identification tag aiming at the temperature detection instruction; determining the temperature in the radio frequency identification tag according to the time domain temperature signal; transmitting a basic tag identification instruction to the radio frequency identification tag; receiving a tag baseband signal fed back by the radio frequency identification tag aiming at the basic tag identification instruction, and identifying tag information carried in the radio frequency identification tag according to the tag baseband signal. By the method, the temperature in the radio frequency identification tag can be detected, meanwhile, the power consumption of an internal circuit of the radio frequency identification tag is low, and the generated time domain temperature signal can be transmitted for a long distance, so that a worker can remotely determine the real-time temperature in the tag, the efficiency of temperature detection in the tag is improved, and the energy consumption required by temperature detection in the tag is saved. Further, the reader can send a temperature detection instruction and receive a time domain temperature signal corresponding to the temperature detection instruction, so that a temperature detection task is completed by analyzing the time domain temperature signal, the reader can remotely receive the time domain temperature signal and analyze the time domain temperature signal, and further, the temperature in the tag can be accurately determined.
Wherein, the radio frequency identification label includes: the system comprises an antenna, an energy acquisition circuit, a basic tag identification circuit, a time domain temperature sensing circuit, a signal selector and a signal output circuit;
the input end of the energy acquisition circuit is connected with the antenna, and the output end of the energy acquisition circuit is respectively connected with the basic tag identification circuit and the time domain temperature sensing circuit; the output ends of the basic tag identification circuit and the time domain temperature sensing circuit are respectively connected with the input end of the signal selector, and the output end of the signal selector is connected with an antenna through a signal output circuit;
the energy acquisition circuit is used for acquiring energy from the antenna and activating the basic tag identification circuit and the time domain temperature sensing circuit by using the acquired energy;
the basic tag identification circuit is used for identifying a control instruction received through an antenna, generating a tag baseband signal when the control instruction is determined to be the basic tag identification instruction, transmitting the tag baseband signal to the signal selector, and triggering the time domain temperature sensing circuit to generate a time domain temperature signal with set duration when the control instruction is determined to be a temperature detection instruction;
the time domain temperature sensing circuit is used for responding to the control of the basic tag identification circuit, generating a time domain temperature signal with set duration and transmitting the time domain temperature signal to the signal selector; the signal selector is used for selecting to transmit the tag baseband signal or the time domain temperature signal to the antenna through the signal output circuit to be sent outwards according to the type of the instruction received through the antenna.
Optionally, the temperature determination module 620 includes:
the sending unit is used for sending a temperature detection instruction for generating a time length detection temperature signal to the radio frequency identification tag;
a temperature unit, configured to determine a temperature in the radio frequency identification tag according to the time domain temperature signal, including:
a time length subunit, configured to calculate, according to the time-domain temperature signal of the set time length fed back by the radio frequency identification tag, an oscillator frequency used by a temperature sensor in the radio frequency identification tag;
and the calculating unit is used for determining the temperature in the radio frequency identification tag according to the frequency of the oscillator.
Optionally, the temperature detection instruction is a write instruction for writing setting information into a setting storage address of the radio frequency identification tag.
Optionally, the basic tag identification circuit specifically includes a duration detection sub-circuit, and the duration detection sub-circuit is connected with the time domain temperature sensing circuit;
the time length detection sub-circuit is used for determining the temperature detection time length according to a preset temperature detection command and controlling the time length of the time domain temperature sensing circuit for detecting the temperature according to the temperature detection time length;
the time domain temperature sensing circuit is used for detecting the temperature in the tag under the control of the time length detection sub-circuit and generating a time domain temperature signal according to the temperature in the tag.
Optionally, the time domain temperature sensing circuit specifically includes: a linear voltage regulator and a programmable ring oscillator;
the linear voltage stabilizer is used for converting a temperature signal in the tag into a voltage signal;
the programmable ring oscillator is used for converting temperature information into frequency information of a time domain and generating an oscillating signal with frequency sensitive to temperature.
Optionally, the tag baseband signal generated by the base tag identification circuit is a baseband signal based on EPC Gen2 protocol.
Optionally, the temperature detection instruction is a write instruction for setting a storage address in the radio frequency identification tag.
The temperature detection device provided by the embodiment of the invention can execute the temperature detection method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Claims (10)
1. A radio frequency identification tag with embedded temperature detection function, comprising: the system comprises an antenna, an energy acquisition circuit, a basic tag identification circuit, a time domain temperature sensing circuit, a signal selector and a signal output circuit;
the input end of the energy acquisition circuit is connected with the antenna, and the output end of the energy acquisition circuit is respectively connected with the basic tag identification circuit and the time domain temperature sensing circuit; the output ends of the basic tag identification circuit and the time domain temperature sensing circuit are respectively connected with the input end of the signal selector, and the output end of the signal selector is connected with an antenna through a signal output circuit; the energy acquisition circuit is used for acquiring energy from the antenna and activating the basic tag identification circuit and the time domain temperature sensing circuit by using the acquired energy;
the basic tag identification circuit is used for identifying a control instruction received through an antenna, generating a tag baseband signal when the control instruction is determined to be the basic tag identification instruction, transmitting the tag baseband signal to the signal selector, and triggering the time domain temperature sensing circuit to generate a time domain temperature signal with set duration when the control instruction is determined to be a temperature detection instruction;
the time domain temperature sensing circuit is used for responding to the control of the basic tag identification circuit, generating a time domain temperature signal with set duration and transmitting the time domain temperature signal to the signal selector;
the signal selector is used for selecting to transmit the tag baseband signal or the time domain temperature signal to the antenna through the signal output circuit to be sent outwards according to the instruction type of the control instruction.
2. The radio frequency identification tag of claim 1, wherein the base tag identification circuit comprises a time length detection sub-circuit, the time length detection sub-circuit being coupled to the time domain temperature sensing circuit;
the time length detection sub-circuit is used for determining the temperature detection time length according to a preset temperature detection command and controlling the time length of the time domain temperature sensing circuit for detecting the temperature according to the temperature detection time length;
the time domain temperature sensing circuit is used for detecting the temperature in the tag under the control of the time length detection sub-circuit and generating a time domain temperature signal according to the temperature in the tag.
3. The radio frequency identification tag of claim 2, wherein the time domain temperature sensing circuit specifically comprises: a linear voltage regulator and a programmable ring oscillator;
the linear voltage stabilizer is used for converting a temperature signal in the tag into a voltage signal;
the programmable ring oscillator is used for converting temperature information into frequency information of a time domain and generating an oscillating signal with frequency sensitive to temperature.
4. The radio frequency identification tag of claim 1, wherein the tag baseband signal generated by the base tag identification circuit is an EPC Gen2 protocol based baseband signal.
5. The rfid tag of claim 1, wherein the temperature detection command is a write command to set a memory address in the rfid tag.
6. A temperature sensing system, comprising: a radio frequency identification tag with embedded temperature sensing function as claimed in any one of claims 1 to 5 and a reader;
the reader is used for sending a temperature detection instruction and a pre-setting command to the radio frequency identification tag and receiving a time domain temperature signal fed back by the radio frequency identification tag aiming at the temperature detection instruction and the pre-setting command; determining the temperature in the radio frequency identification tag according to the time domain temperature signal; and
the reader is further used for sending a basic tag identification instruction to the radio frequency identification tag, receiving a tag baseband signal fed back by the radio frequency identification tag aiming at the basic tag identification instruction, and identifying tag information carried in the radio frequency identification tag according to the tag baseband signal.
7. The system of claim 6, wherein the reader is an EPC Gen2 protocol based reader.
8. A method of temperature detection performed by a reader in the temperature sensing system of claim 6, the method comprising:
sending a temperature detection instruction and a pre-setting command to the radio frequency identification tag;
the radio frequency identification tag is used for determining a temperature detection duration according to the preset setting command, and controlling an internal time domain temperature sensing circuit to generate a corresponding time domain temperature signal according to the temperature detection command, the temperature in the tag and the temperature detection duration;
receiving a time domain temperature signal fed back by the radio frequency identification tag aiming at the temperature detection instruction; determining the temperature in the radio frequency identification tag according to the time domain temperature signal;
transmitting a basic tag identification instruction to the radio frequency identification tag;
receiving a tag baseband signal fed back by the radio frequency identification tag aiming at the basic tag identification instruction, and identifying tag information carried in the radio frequency identification tag according to the tag baseband signal.
9. The method of claim 8, wherein sending a temperature detection command to the radio frequency identification tag comprises:
transmitting a temperature detection instruction for generating a temperature signal for detecting the set time length to the radio frequency identification tag;
determining the temperature in the radio frequency identification tag according to the time domain temperature signal, comprising:
according to the time domain temperature signal of the set time length fed back by the radio frequency identification tag, calculating the frequency of an oscillator used by a temperature sensor in the radio frequency identification tag;
and determining the temperature in the radio frequency identification tag according to the frequency of the oscillator.
10. The method of claim 8, wherein the temperature detection instruction is a write instruction to write setting information to a setting memory address of the radio frequency identification tag.
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| CN202311762298.5A CN117744680A (en) | 2023-12-19 | 2023-12-19 | Radio frequency identification tag, temperature detection system and temperature detection method |
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| CN202311762298.5A CN117744680A (en) | 2023-12-19 | 2023-12-19 | Radio frequency identification tag, temperature detection system and temperature detection method |
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