CN110909847A

CN110909847A - RFID passive chip capable of measuring temperature, working method, temperature measurement label and temperature measurement system

Info

Publication number: CN110909847A
Application number: CN201910946299.2A
Authority: CN
Inventors: 孙成文; 李朝晖; 薛超
Original assignee: Haiwang Data Information Technology Tianjin Co Ltd
Current assignee: Haiwang Data Information Technology Tianjin Co Ltd
Priority date: 2019-10-04
Filing date: 2019-10-04
Publication date: 2020-03-24

Abstract

The invention discloses a temperature measurable RFID passive chip, a working method, a temperature measurement label and a temperature measurement system, wherein the temperature measurable RFID passive chip comprises: the logic control module is used for realizing the logic relation and calculation of each control module; the RF interface module is in communication connection with the logic control module and realizes the purpose of providing working voltage for the logic control module; the temperature sensor module is in communication connection with the logic control module and is used for writing the read temperature into the data storage module; and the EEPROM module is in communication connection with the logic control module to realize storage of read data. The invention has the beneficial effects that the chip design is carried out by adopting a mode of fusing the passive RFID technology and the chip-level temperature measurement technology, so that one RFID chip has the RFID and temperature measurement functions.

Description

RFID passive chip capable of measuring temperature, working method, temperature measurement label and temperature measurement system

Technical Field

The invention relates to semiconductor improvement, in particular to an RFID passive chip capable of measuring temperature, a working method, a temperature measuring label and a temperature measuring system.

Background

The Radio Frequency Identification (RFID) technology is a non-contact automatic Identification technology, and transmits signals in an electromagnetic wave or inductive manner to automatically identify a target object. Compared with the traditional RFID technology, the RFID technology has the advantages of no need of manual intervention in the identification process, capability of identifying a plurality of targets simultaneously, large information storage capacity, capability of working in various severe environments and the like.

However, the information content of the existing passive RFID technology is too single, and the environment sensor technology is not fused with the existing passive RFID technology. In the scene of the existing internet of things, the goods are transported to require the RFID technology to judge the goods information, but the goods need to monitor the temperature at the same time, and if the cold chain scene is adopted, a manufacturer can monitor the temperature by adopting a mode of additionally installing a temperature sensor on the goods, so that the cost is greatly increased.

Disclosure of Invention

The invention aims to solve the problems and designs an RFID passive chip capable of measuring temperature, a working method, a temperature measuring label and a temperature measuring system.

The technical scheme of the invention is that the RFID passive chip capable of measuring temperature comprises:

the logic control module is used for realizing the logic relation and calculation of each control module;

the RF interface module is in communication connection with the logic control module and realizes the purpose of providing working voltage for the logic control module;

the temperature sensor module is in communication connection with the logic control module and is used for writing the read temperature into the data storage module;

and the EEPROM module is in communication connection with the logic control module to realize storage of read data.

Preferably, the RF interface module is further connected to a radio frequency antenna, and modulates and demodulates the transmission signal and the reception signal; the RF interface module is provided with a voltage stabilizer, a modulator, a demodulator, a checker and a rectifier, and is connected with the voltage stabilizer which is respectively connected with the checker through the modulator or/and the demodulator.

Preferably, when the chip is powered on by radio frequency energy, the reader-writer transmits a radio frequency signal to the tag, the chip is activated by the received radio frequency signal, the ultra-low power consumption temperature sensor module starts to work, and the read temperature is written into the data storage module.

Preferably, the logic control module is a chip internal module, has no concept of circuit connection, is a core inside the chip, and the following functions are corresponding software logic functions of the chip, including label anti-collision, read-write control, access control, EEPROM interface control, storage protection control, RF interface control and temperature sensor interface control.

Preferably, the storage module of the EEPROM module is divided into a read-only memory and a read-write memory, wherein the read-only memory records the RFID unique ID information, and the read-write memory records the temperature measurement sensor information.

The working method of the RFID passive chip capable of measuring the temperature comprises the following steps:

a passive temperature measurement RFID chip receives signals;

the chip is activated by the radio frequency signal energy, and the chip starts to work;

the chip places the temperature information in the RAM;

and converting the RFID information and the temperature information into radio frequency signals for transmission.

An RFID temperature measurement label comprises the RFID passive chip capable of measuring temperature.

An RFID thermometry system, comprising:

the RFID temperature measurement label;

an RFID reader;

a memory;

the memory, the RFID reader-writer and the RFID temperature measurement tag are connected in sequence.

Preferably, the memory comprises a cloud system or a local system.

The RFID passive chip capable of measuring temperature, the working method, the temperature measuring label and the temperature measuring system which are manufactured by the technical scheme of the invention adopt a mode of fusing the passive RFID technology and the chip-level temperature measuring technology to carry out chip design, so that one RFID chip has the functions of RFID and temperature measurement, and the RFID passive chip has the following specific beneficial effects:

1. combining the RFID technology with the temperature measurement technology;

2. the passive RFID temperature measurement is adopted, so that the cost of single temperature measurement is greatly reduced;

3. the passive RFID is adopted, and power supply is not needed, so that the problem that power supply is needed for single temperature measurement is solved;

4. the service life of the label is greatly prolonged without power supply.

In conclusion, an active temperature measurement mode is adopted in the prior art, the existing RFID tag needs to be powered by a battery, so that the cost of a tag single body is greatly increased, and the price of one battery is about 3 yuan. By adopting the technology in the patent, the battery is not needed, the real passive temperature measurement is realized, the temperature measurement cost of the single label is greatly reduced, the temperature measurement cost of the single label is only within 1 yuan, and the range of applicable scenes is expanded;

the technology combines a passive RFID technology and a temperature measuring technology, combines a temperature measuring sensor and the RFID into one chip, does not need power supply, can activate the chip and a temperature measuring sensing part only by micro energy of electromagnetic waves, returns the information of the temperature measuring sensing part through the electromagnetic waves, and realizes reading of temperature information. The method cannot be realized in the prior art, multiple chips are needed, and a battery is added for supplying power, so that the cost of single temperature measurement is increased. By adopting the technology in the patent, temperature measurement can be carried out without any battery power supply, and the cost of single temperature measurement is greatly reduced.

Drawings

FIG. 1 is a diagram of an internal structure of an RFID temperature measurement chip according to the present invention.

FIG. 2 is a pin layout diagram of an RFID temperature measurement chip according to the present invention.

FIG. 3 is a typical circuit diagram of an RFID temperature measurement chip according to the present invention.

FIG. 4 is a flow chart of the use of an RFID temperature measurement chip according to the present invention.

FIG. 5 is a schematic diagram of a chip-based thermometry system according to the present invention.

FIG. 6 is a flow chart of the actual operation of an RFID temperature measurement chip according to the present invention.

FIG. 7 is a diagram illustrating a multi-scenario of an RFID thermometry system according to the present invention.

FIG. 8 is a graph of the temperature error within range of an RFID temperature tag of the present invention.

FIG. 9 is a front view of an RFID temperature tag of the present invention.

FIG. 10 is a rear view of an RFID temperature tag of the present invention.

Fig. 11 is a schematic diagram of the connection of the RF interface module, the regulator, the modulator, the demodulator, and the verifier according to the present invention.

FIG. 12 is a flow chart of the practical use of an RFID temperature measuring tag according to the present invention.

1. RFID temperature measurement chip 2, far field antenna 3, PCB circuit board

4. Internal resonance LC coil

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The technical scheme provided by the invention relates to a TFID chip, and in the related technology, multiple chips are needed and a battery is added for power supply, so that the cost of single temperature measurement is increased. By adopting the technology in the patent, temperature measurement can be carried out without any battery power supply, and the cost of single temperature measurement is greatly reduced. Based on this, the passive RFID technology and the temperature measurement technology are combined, the temperature measurement sensor and the RFID are combined into one chip, power supply is not needed, the chip and the temperature measurement sensing part can be activated only through the tiny energy of electromagnetic waves, the information of the temperature measurement sensing part is returned through the electromagnetic waves, and reading of temperature information is achieved.

The first embodiment is as follows:

the invention is described in detail below with reference to the accompanying drawings, and an RFID passive chip capable of measuring temperature includes: the logic control module is used for realizing the logic relation and calculation of each control module; the RF interface module is in communication connection with the logic control module and realizes the purpose of providing working voltage for the logic control module; the temperature sensor module is in communication connection with the logic control module and is used for writing the read temperature into the data storage module; and the EEPROM module is in communication connection with the logic control module to realize storage of read data.

The invention provides the RFID passive chip capable of measuring temperature, which meets the requirement of a passive RFID technology and simultaneously provides a temperature measuring function. The present invention will be described in detail with reference to fig. 1 to 10.

The RFID passive chip capable of measuring temperature comprises: a logic control module, an RF interface module, a temperature sensor module and an EEPROM module.

The logic control is a logic control part of the chip, the logic relation and calculation of each module are controlled by a logic control module, the logic control module is in communication connection with the RF interface module, the temperature sensor module and the EEPROM module, and the working voltage of the logic control module is provided by the RF interface module.

The logic control module comprises the functions of label anti-collision, read-write control, access control, EEPROM interface control, storage protection control, RF interface control, temperature sensor interface control and the like.

And the RF interface module is connected with the logic control module and the radio frequency antenna and used for modulating and demodulating the sending signal and the receiving signal. The RF interface module comprises functions of a voltage stabilizer, modulation, demodulation, verification, a rectifier and the like.

When the chip is powered on by radio frequency energy, the temperature sensor module with ultra-low power consumption starts to work and writes the read temperature into the data storage module.

The storage module in the EEPROM module chip is divided into a read-only memory and a read-write memory, the read-only memory records the RFID unique ID information, and the read-write memory records the temperature sensor information. Because the sensor information changes constantly, a piece of readable and writable memory space needs to be opened up for the use of the sensor information.

Fig. 1 is a diagram showing the internal structure of a chip, which is composed of a logic control module, an RF interface module, a temperature sensor module, and an EEPROM module. When the chip works, the temperature sensor module collects the temperature and writes the information into the read-write memory of the data storage module, and the chip sends the real-time rewritten information to the RFID reader-writer.

Fig. 2 is a schematic diagram of chip pins, where the chip includes 4 pins, and the RF1 and RF2 pins are RF signal transmitting/receiving pins, and the 2 NC pins in the diagram do not have practical effects in actual operation. In the production stage and the error checking stage, the information stored in the EEPROM can be read from the two NC pins.

Fig. 3 shows a typical chip circuit, where Cc is a typical equivalent input capacitance value of 0.85pf, Rc is a typical equivalent input resistance value of 1.03K Ω, and Cb is Bump to generate an equivalent capacitance value of 0.2 pf. The values are adjusted to match the conjugate in the real use environment by an impedance model in a typical circuit.

The actual application in cold chain transportation is as follows, and the current temperature measurement current situation of cold chain transportation can only carry out temperature monitoring to the carriage body or big packing box, can't accomplish the real-time supervision to packing minimum unit. The existing temperature measuring equipment consists of a temperature chip, a battery and a communication chip, so that the transmission of temperature information can be completed. The passive temperature measurement RFID chip can solve the three technical problems on one chip. Firstly, the energy of the passive temperature measurement RFID chip is derived from radio frequency energy, so that a battery does not need to be additionally arranged on each temperature measurement point, and the passive temperature measurement RFID chip utilizes the principle of an RFID technology to complete the content required to be completed by the communication chip, thereby greatly reducing the cost of temperature monitoring.

Fig. 4 shows steps that the temperature measurement chip needs to perform a round of monitoring, in a cold chain transportation scenario, the RFID reader is configured in all links through which a product passes, and the process of fig. 2 is performed once per second, so that temperature monitoring of the product can be performed in the full life cycle of the product, and the cycle is 1S.

Fig. 6 is a flowchart of the operation of the chip in actual operation, when the external reader/writer transmits the radio frequency signal, the radio frequency signal is first received by the RF interface module. The RF interface module receives a radio frequency signal, firstly, the chip is electrically activated, and the chip demodulates the received signal. The RF interface module transfers the demodulated information to the logic control module, and the read-write control and access control part in the logic control module transfers the information between the modules. The logic control module firstly carries out label anti-collision judgment on the received signals, and if the labels are judged to be anti-collision, the logic control module starts to work. The logic control module extracts the label ID information stored in the EEPROM module, extracts the temperature information measured by the temperature sensor module, and sends the two extracted information to the RF interface module, wherein the specific sending mode is carried out by the read-write control function of the logic control module. The information received by the RF interface is modulated, and the modulated signal is transmitted by radio frequency through two pins of RF1 and RF 2. And the external reader-writer receives the signal sent by the label to complete one round of information exchange.

FIG. 11 is a schematic diagram of the RF interface module further connected to a radio frequency antenna for modulation and demodulation of the transmitted and received signals; the RF interface module is provided with a voltage stabilizer, a modulator, a demodulator and a checker, the RF interface module is connected with the voltage stabilizer, the voltage stabilizer is respectively connected with the checker through the modulator or/and the demodulator, and the further point to be pointed out is that the voltage stabilizer is used for stabilizing the voltage of signals; the demodulator is used for filtering the signal carrier to obtain an available signal; the checker is used for checking the signal information; the modulator is used to add a carrier to the signal.

The manufacturing process of the RFID passive chip capable of measuring temperature can adopt the following steps: the manufacture of the antenna is carried out by three manufacturing processes of FPC, inlay and PCB,

the FPC process is a flexible circuit board, also called FPC flexible board, which is a printed circuit made of flexible insulating base materials.

The inlay process refers to a pre-lamination process for laminating a plurality of PVC sheets containing chips and coils.

Wherein the PCB process is a printed circuit board process.

Example two:

step s01, the external reader-writer transmits radio frequency signals;

step s02, the chip RF interface module receives the radio frequency signal;

step s03, the RF interface module powers on the chip to activate according to the energy of the radio frequency signal;

step s01, the RF interface module demodulates the radio frequency signal;

step s04, the RF interface module sends the demodulated signal information to the logic control module;

step s05, the logic control module performs label anti-collision detection;

step s06, the logic control module fetches the label ID information from EEPROM;

step s07, the logic control module extracts temperature information from the temperature sensor module;

step s08, the logic control module sends the information to the RF interface module;

step s09, the RF interface module modulates the received information;

step s10, transmitting the modulated signals from the RF1 and RF2 pins;

and step s11, the external reader-writer receives the radio frequency signal of the tag.

Example three:

Fig. 7 shows a use scenario for the label, where the left side is industry and the right side is actual use product.

Such as: in cold chain transportation, the label made of the chip is attached to cold chain transportation products such as vaccines, blood bags, beef, red wine and the like, so that the temperature of the transported products can be monitored in real time. The temperature corresponds to the product one by one, and errors can be avoided.

Such as: in the power system, the label is attached to the position, so that the temperature can be monitored in real time, the fire can be avoided, and whether the circuit is damaged or not can be judged through the temperature.

Such as: in the laboratory, it is applicable in medical laboratory, chemical laboratory, biological laboratory etc. carries out temperature monitoring to reagent and sample in the laboratory, prevents the experimental accident that leads to by the laboratory product custody is improper.

Such as: in animal husbandry, can carry out real-time supervision to biological body surface temperature, discover the epidemic situation in advance, keep apart, also can promote output through the big data of temperature.

Fig. 8 shows the actually measured temperature curve of the chip, where the X-axis is temperature, and the Y-axis is temperature error, and the actually measured curve is nonlinear, and it can be seen from the curve that the use condition in the use scenario can be satisfied.

Example four, as shown in fig. 5 and 12:

an RFID thermometry system, comprising: the RFID temperature measurement label;

an RFID reader; a memory; the memory, the RFID reader-writer and the RFID temperature measurement tag are connected in sequence; the memory comprises a cloud system or a local system; the RFID temperature measurement label containing the RFID chip is attached to the minimum unit of a product, the RFID reader-writer and the RFID temperature measurement label are stored, the RFID reader-writer sends a radio frequency signal to the label to feed back information of the label, real-time monitoring is carried out on the temperature and the position of the minimum package of the product, uploading is implemented, temperature data are real and effective, tampering is prevented, the label is not provided with a battery, and the RFID temperature measurement label is safe, environment-friendly, light, thin, small and low in cost.

Taking the cold chain transportation field as an example: in gathering product temperature information to high in the clouds or local server in the cold chain transportation, these data are got down by real-time recording, can supply product producer, commodity circulation merchant, distributor, consumer to carry out the temperature inquiry of full product cycle, and the producer can find out the link that can influence product quality according to the product temperature curve, and the commodity circulation merchant can provide better logistics service according to the temperature of monitoring, and the distributor can judge the quality problem of this product according to the temperature in the consumer.

The technical solutions described above only represent the preferred technical solutions of the present invention, and some possible modifications to some parts of the technical solutions by those skilled in the art all represent the principles of the present invention, and fall within the protection scope of the present invention.

Claims

1. RFID passive chip that can temperature measurement, its characterized in that, RFID passive chip that can temperature measurement includes:

2. The RFID passive chip capable of measuring temperature according to claim 1, wherein the RF interface module is further connected to a radio frequency antenna for modulation and demodulation of the transmission signal and the reception signal; the RF interface module is provided with a voltage stabilizer, a modulator, a demodulator and a checker, the RF interface module is connected with the voltage stabilizer, and the voltage stabilizer is respectively connected with the checker through the modulator or/and the demodulator.

3. The RFID passive chip capable of measuring temperature according to claim 1, wherein the temperature sensor module transmits a radio frequency signal to the tag by the reader/writer when the chip is powered on by radio frequency energy, the chip is activated by the received radio frequency signal, the ultra-low power consumption temperature sensor module starts to operate, and the read temperature is written into the data storage module.

4. The RFID passive chip capable of measuring temperature according to claim 1, wherein the logic control module is an internal module of the chip, has no concept of circuit connection, and is an internal core of the chip, and the following functions are corresponding software logic functions thereof, including tag anti-collision, read-write control, access control, EEPROM interface control, memory protection control, RF interface control, and temperature sensor interface control.

5. The RFID passive chip capable of measuring temperature according to claim 1, wherein the storage module of the EEPROM module is divided into a read-only memory and a read-write memory, the read-only memory records the RFID unique ID information, and the read-write memory records the temperature sensor information.

6. The working method of the RFID passive chip capable of measuring temperature according to claim 1 is characterized by comprising the following steps:

a passive temperature measurement RFID chip receives signals;

the chip places the temperature information in the RAM;

7. An RFID thermometric tag, wherein the RFID thermometric tag comprises the thermometric RFID passive chip according to any one of claims 1-5.

8. An RFID temperature measurement system is characterized by comprising the following steps:

the RFID thermometric tag of claim 6;

an RFID reader;

a memory;

9. The RFID thermometry system of claim 8, wherein the memory comprises a cloud system or a local system.