CN113792563A - Dual-mode radio frequency identification sensor, system and working method - Google Patents
Dual-mode radio frequency identification sensor, system and working method Download PDFInfo
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- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
- G06K7/10326—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers the antenna being of the very-near field type, e.g. capacitive
Abstract
The invention provides a dual-mode radio frequency identification sensor, a system and a working method, wherein the sensor comprises a sensor module for realizing data measurement; the microcontroller module is connected with the sensor module and used for reading the measurement data of the sensor module; the radio frequency module is connected with the microcontroller module and is used for realizing radio frequency transmission of measurement data; the radio frequency module comprises a high-frequency module and an ultrahigh frequency module, and the high-frequency module and the ultrahigh frequency module are both connected with the microcontroller module; and the microcontroller module judges whether the current working mode is a high-frequency mode or an ultrahigh-frequency mode. The dual-mode radio frequency sensor comprises a high-frequency module and an ultrahigh frequency module, and can support two working modes of high frequency and ultrahigh frequency.
Description
Technical Field
The invention relates to the technical field of radio frequency, in particular to a dual-mode radio frequency identification sensor, a dual-mode radio frequency identification system and a working method.
Background
Radio Frequency Identification (RFID) is widely applied to various fields such as production and processing, logistics and storage management, intelligent agriculture, biomedical treatment, access control management, mobile payment and the like as a key enabling technology for information perception integration in the application of the Internet of things, so that the working efficiency is greatly improved, and the production and life of people are facilitated. Compared with visual identification technologies such as bar codes and two-dimensional codes, the RFID tag can realize the advantages of non-line-of-sight identification transmission, long reading distance, large information capacity, one-time reading of multiple tags and the like, and can accurately identify the identity of an article and further integrate or acquire related information by rapidly reading ID information carried by the tag in a radio frequency energy recovery mode. For many applications of the internet of things, the object identification is finally for automatically and conveniently integrating perception information. The common RFID is divided into an ultrahigh frequency and a high frequency, so that the far-field application such as logistics tracking and the like and the near-field application based on the smart phone are respectively met. The two are integrated, a dual-mode RFID sensor capable of working in two modes is designed, ultra-high frequency and high frequency radio frequency wireless power supply is supported to complete a measurement task, the application requirements of far-field and near-field recognition sensing are met, and the problems that the traditional method cannot complete the recognition measurement task and two technologies cannot meet different application requirements can be well solved.
The existing RFID label integrated with the UHF-HF radio frequency interface does not have the reading and writing operation capability of an external processor, cannot flexibly integrate sensitive devices according to application requirements to form a UHF-HF dual-mode RFID sensor, and can acquire sensor information through a universal reading and writing device, thereby simultaneously having the identification and sensing functions.
Disclosure of Invention
In view of the above, the present invention provides a dual-mode radio frequency identification sensor, a system and a working method thereof, so as to solve the problems in the prior art.
In order to solve the technical problems, the invention adopts the technical scheme that: a dual-mode radio frequency identification sensor, the sensor comprising:
the sensor module is used for realizing data measurement;
the microcontroller module is connected with the sensor module and used for reading the measurement data of the sensor module; and
the radio frequency module is connected with the microcontroller module and is used for realizing radio frequency transmission of measurement data;
the radio frequency module comprises a high-frequency module and an ultrahigh frequency module, and the high-frequency module and the ultrahigh frequency module are both connected with the microcontroller module; and the microcontroller module judges whether the current working mode is a high-frequency mode or an ultrahigh-frequency mode.
Preferably, the high frequency module comprises a high frequency RFID chip, a first matching circuit connected with the high frequency RFID chip, and a high frequency RFID antenna connected with the first matching circuit; and the high-frequency RFID chip is connected with the microcontroller module.
Preferably, the high frequency module further comprises a first RF-DC rectifying circuit, and the first RF-DC rectifying circuit is connected with the microcontroller module and the sensor module, respectively.
Preferably, the ultrahigh frequency module comprises an ultrahigh frequency RFID chip, a second matching circuit connected with the ultrahigh frequency RFID chip, and an ultrahigh frequency RFID antenna connected with the second matching circuit; and the ultrahigh frequency RFID chip is connected with the microcontroller module.
Preferably, the ultrahigh frequency module further comprises a second RF-DC rectifying circuit, and the second RF-DC rectifying circuit is connected to the microcontroller module and the sensor module, respectively.
Preferably, the uhf module further comprises a charge management module connected between the second RF-DC rectifying circuit and the microcontroller module and sensor module.
Preferably, the charge management module comprises a low-voltage charge pump, a super capacitor and a DC-DC voltage regulator.
Preferably, the dual-mode rf sensor further includes a power supply protection module, and the power supply module is configured to protect the high-frequency module and the ultra-high-frequency module.
A dual-mode radio frequency identification sensor system comprises a dual-mode radio frequency identification sensor and intelligent equipment.
A method of operating a dual mode radio frequency identification sensor, the method comprising:
judging the working mode of the dual-mode radio frequency sensor;
and completing the reading and writing of the radio frequency data according to the current working mode.
The invention has the advantages and positive effects that: the dual-mode radio frequency sensor comprises a high-frequency module and an ultrahigh frequency module, and can support two working modes of high frequency and ultrahigh frequency.
The high-frequency module and the ultrahigh-frequency module are embedded with the RF-DC conversion circuit, so that radio frequency energy can be recovered, a battery is not required to be configured to supply power to the dual-mode radio frequency sensor, and the dual-mode radio frequency identification sensor tends to be light in weight, small in size and integrated. And the ultrahigh frequency module is provided with a charge management module which can collect low-voltage charges generated by the ultrahigh frequency module, store the low-voltage charges into the super capacitor, discharge the charges after the low-voltage charges reach a specified voltage, and provide a stable voltage through the DC-DC voltage stabilizer so as to supply power to the dual-mode radio frequency sensor.
The power supply protection module is arranged, the power supply protection module forms a radio frequency interface selection and power supply protection module through two low-voltage analog switches, and the problem that the ultrahigh frequency part of a super capacitor cannot be read normally due to too short discharge time caused by forward voltage drop of a Schottky diode is solved; meanwhile, the dual-mode radio frequency sensor is guaranteed to support any one of ultrahigh frequency and high frequency radio frequency working modes, the microcontroller module and the sensor module can normally supply power, and the radio frequency module which is not activated is not damaged by reverse power supply.
According to the embodiment of the invention, the miniaturized components are integrated on the flexible substrate, so that the sensor is high in integration level, simple in structure, miniaturized and light in weight, and is easy to integrate into the identified and sensed object; the working mode is distinguished by judging the voltage of the power supply part, two working modes are supported, and the device is suitable for application occasions combining a far field, a near field and a far field and a near field, and is wide in application range; the method supports a user to complete real-time measurement and tracking of historical data through the smart phone with the NFC function, does not need to additionally install software, and is fast and convenient to use.
Drawings
FIG. 1 illustrates a block diagram of a dual mode radio frequency identification sensor in accordance with an embodiment of the present invention;
FIG. 2 shows a block diagram of a sensor module of an embodiment of the invention;
FIG. 3 illustrates a block diagram of a radio frequency module of a dual mode radio frequency identification sensor in accordance with an embodiment of the present invention;
fig. 4 shows a schematic structural diagram of a power supply protection module according to an embodiment of the present invention;
FIG. 5 shows a schematic diagram of a first analog switch according to an embodiment of the invention;
FIG. 6 shows a schematic diagram of a first analog switch according to an embodiment of the invention;
FIG. 7 is a schematic diagram of an external appearance of a dual mode RF sensor according to an embodiment of the invention;
FIG. 8 illustrates a block diagram of a dual mode RF sensor system according to an embodiment of the invention;
FIG. 9 is a flow chart of a method of operation of a dual mode RF sensor in accordance with an embodiment of the present invention;
fig. 10 shows a flowchart of the dual-mode rf sensor according to an embodiment of the present invention operating in the high-frequency operating mode or the ultra-high-frequency operating mode.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description and accompanying drawings.
FIG. 1 illustrates a block diagram of a dual mode radio frequency identification sensor in accordance with an embodiment of the present invention; as shown in fig. 1, the dual-mode rf sensor 100 includes a sensor module 10, a microcontroller module 20, and an rf module 30, wherein the sensor module 10 is connected to the microcontroller module 20, the rf module 30 includes a high-frequency module 31 and an ultra-high-frequency module 32, and both the high-frequency module 31 and the ultra-high-frequency module 32 are connected to the microcontroller module 20.
In the embodiment of the present invention, the sensor module 10 is configured to implement data measurement, and the microcontroller module 20 reads the measurement data of the sensor module 10, processes the measurement data of the sensor module 10, and implements radio frequency transmission with the outside through the radio frequency module 30. The radio frequency module 30 includes a high frequency module 31 and an ultrahigh frequency module 32, the microcontroller module 20 determines whether the current operating mode is a high frequency mode or an ultrahigh frequency mode, and when the operating mode is the high frequency mode, the microcontroller module 30 transmits sensor data through the high frequency module 31; otherwise, the sensor data is transmitted through the uhf module 32.
The dual-mode rf sensor 100 of the embodiment of the invention includes a high-frequency module 31 and an ultra-high frequency module 32, and can support two working modes, i.e., a high-frequency mode and an ultra-high frequency mode.
FIG. 2 shows a block diagram of a sensor module of an embodiment of the invention; as shown in fig. 2, the sensor module 10 is composed of one or more low power, miniaturized sensing devices that meet different application requirements, for example, in one specific embodiment, the sensor module 10 includes a sensor 1, a sensor 2 … …, a sensor n, wherein the sensor 1, the sensor 2 … …, the sensor n is an analog and/or digital sensor. When the sensor is an analog sensor, the sensor is connected with an AD converter embedded in the microcontroller module, when the sensor is a digital sensor, the sensor can be connected with the microcontroller module 20 through serial buses such as SPI and I2C, and the data measured by the sensor module 10 is read by the microcontroller module 20 through an a/D converter or a serial data bus.
The microcontroller module 20 adopts an ultra-low power consumption single chip microcomputer, and on one hand, the sensor module 10 is configured through an AD converter and/or an SPI or an I2C serial bus to read the sensor data of the sensor module 10; on the other hand, the current working mode is judged, and the activated high-frequency module 31 or the activated ultrahigh-frequency module 32 is written in through the serial bus, so that the functions of reading and sending the sensor data are completed.
FIG. 3 illustrates a block diagram of a radio frequency module of a dual mode radio frequency identification sensor in accordance with an embodiment of the present invention; as shown in fig. 3, the high frequency module 31 includes a high frequency RFID chip 311, a first matching circuit 312 connected to the high frequency RFID chip 311, and a high frequency RFID antenna 313 connected to the first matching circuit 312; the high-frequency RFID antenna 313 and the first matching circuit 312 generate induced alternating-current voltage through inductive coupling with an external reader-writer coil antenna, so as to complete receiving and sending of radio-frequency signals; the first matching circuit 312 realizes conjugate matching between the high-frequency RFID chip 311 and the high-frequency RFID antenna 313, so as to achieve efficient transmission of wireless energy; the high-frequency RFID chip 311 is connected to the microcontroller module 20, the high-frequency RFID chip 311 is a microcontroller readable and writable operation integrated circuit, and the function configuration and data interaction are completed through an I2C serial data bus of the microcontroller module 20, and finally, the function of data transmission with a reader-writer through a radio frequency signal is realized through load modulation.
In this embodiment, the high-frequency RFID antenna 313 is a 13.56MHz high-frequency coil antenna.
The high frequency module 31 further comprises a first RF-DC rectifying circuit 314, the first RF-DC rectifying circuit 314 is respectively connected to the microcontroller module 20 and the sensor module 10, and the first RF-DC rectifying circuit 314 converts the generated ac signal into DC voltage to supply power to the subsequent microcontroller module 20 and the sensor module 10.
The uhf module 32 includes a second matching circuit 322 in which an uhf RFID chip 321 is connected to the uhf RFID chip 321, and an uhf RFID antenna 323 connected to the second matching circuit 322; the ultrahigh frequency RFID antenna 323 and the second matching circuit 322 generate induced alternating voltage through inductive coupling with an external reader-writer coil antenna to complete receiving and sending of radio frequency signals; the second matching circuit 322 realizes conjugate matching between the ultrahigh frequency RFID chip 321 and the ultrahigh frequency RFID antenna 323, so as to achieve efficient transmission of wireless energy; the ultrahigh frequency RFID chip 321 is connected to the microcontroller module 20, the ultrahigh frequency RFID chip 321 is a microcontroller readable and writable operation integrated circuit, function configuration and data interaction are completed through an SPI serial data bus of the microcontroller module 20, and finally, a function of data transmission with a reader-writer through a radio frequency signal is realized through load modulation.
In this embodiment, the ultrahigh frequency RFID antenna 323 employs an 860 and 920MHz symmetric half-wave dipole antenna.
The uhf module 32 further includes a second RF-DC rectifying circuit 324, the second RF-DC rectifying circuit 324 is connected to the microcontroller module 20 and the sensor module 10, respectively, and the second RF-DC rectifying circuit 324 converts the generated ac signal into a DC voltage to supply power to the subsequent microcontroller module 20 and the sensor module 10.
The uhf module 32 further includes a charge management module 325, the charge management module 325 being connected between the second RF-DC rectifying circuit 324 and the microcontroller module 20 and the sensor module 10.
The charge management module 325 includes a low voltage charge pump 3251, a super capacitor 3252, and a DC-DC regulator 3253. The low-voltage charge pump 3251 is connected to the second RF-DC rectifying circuit 324 and a charging interface of the super capacitor 3252, a discharging interface of the super capacitor 3252 is connected to the DC-DC voltage regulator 3253, and the DC-DC voltage regulator 3253 is connected to the microcontroller module 20 and the sensor module 10.
The super capacitor 3252 boosts the DC voltage generated by the second RF-DC rectifying circuit 324 and stores the super capacitor 3252, the super capacitor 3252 starts to discharge when the voltage of the super capacitor 3252 rises to a specified voltage, and the DC-DC voltage regulator 3253 regulates the voltage output by the super capacitor 3252 and transmits the regulated DC voltage to the microcontroller module 20 and the sensor module 10, so as to supply power to the microcontroller module 20 and the sensor module 10.
In the traditional RFID tag integrated with the UHF-HF radio frequency interface, because the RFID sensor needs to consume electricity for identification, perception and communication, the RFID sensor powered by a battery cannot achieve light weight, miniaturization and integration, and is further packaged into an identified and perceived article.
In the embodiment of the present invention, the RF-DC conversion circuit is embedded in the high frequency module 31 and the ultra high frequency module 32, so that radio frequency energy can be recovered, and a battery is not required to be configured to supply power to the dual-mode radio frequency sensor 100, so that the dual-mode radio frequency sensor 100 tends to be light in weight, small in size, and integrated.
In addition, the traditional RFID tag integrated with the UHF-HF radio frequency interface has low direct current voltage generated by energy recovery due to low ultrahigh frequency energy density, and cannot support a system to integrate a plurality of sensors.
In the embodiment of the present invention, the ultrahigh frequency module 32 is provided with a charge management module 325, and the charge management module 325 can collect low-voltage charges generated by the ultrahigh frequency module 32, store the low-voltage charges in a super capacitor, discharge the charges after reaching a specified voltage, and provide a stable voltage through a DC-DC voltage regulator, so as to supply power to the dual-mode rf sensor 100.
Fig. 4 shows a schematic structural diagram of a power supply protection module according to an embodiment of the present invention; as shown in fig. 4, the dual-mode rf sensor 100 further includes a power supply protection module 50, and the power supply protection module 50 is used for protecting the high-frequency module 31 and the uhf module 32.
The power protection module 50 includes a first analog switch 51 and a second analog switch 52.
FIG. 5 shows a schematic diagram of a first analog switch according to an embodiment of the invention; as shown in fig. 5, the first analog switch 51 includes a first input terminal 511, a first output terminal 512 and a first control terminal 513, wherein the first input terminal 511 is connected to the high frequency module 31, specifically to the first RF-DC rectifying circuit 314, the first output terminal 512 is connected to the sensor module 10 and the controller module 20, and the first control terminal 513 is connected to the microcontroller module 20.
FIG. 6 shows a schematic diagram of a first analog switch according to an embodiment of the invention; as shown in fig. 6, the second analog switch 52 includes a second input terminal 521, a second output terminal 522 and a second control terminal 523, wherein the second input terminal 521 is connected to the uhf module 32, specifically to the DC-DC regulator 3253, the second output terminal 522 is connected to the sensor module 10 and the controller module 20, and the second control terminal 523 is connected to the microcontroller module 20.
The microcontroller module 20 determines the operating mode of the dual-mode rf sensor 100 of this embodiment, specifically, the microcontroller module 20 reads the rectified voltage of the high-frequency module 31 and the dc output voltage of the uhf module 32.
When the rectified voltage of the high frequency module 31 is read, a control signal is input to the first control terminal 513 of the first analog switch 51 to control the first input terminal 511 and the first output terminal 512 of the first analog switch 51 to be turned on, the high frequency module 31 supplies power to the sensor module 10 and the controller module 20 through the first RF-DC rectifying circuit 314, and at this time, the second analog switch 52 is turned off to prevent the first RF-DC rectifying circuit 314 from supplying power reversely to the uhf module 32, thereby damaging the uhf module 32.
When the direct-current voltage of the uhf module 32 is read, a control signal is input to the second control terminal 523 of the second analog switch 52 to control the second input terminal 521 and the second output terminal 522 of the second analog switch 52 to be connected, the uhf module 32 supplies power to the sensor module 10 and the controller module 20 through the second RF-DC rectifying circuit 324 and the charge management module 325, and at this time, the first analog switch 51 is disconnected to prevent the second RF-DC rectifying circuit 324 and the charge management module 325 from supplying power to the hf module 31 in a reverse direction, thereby damaging the hf module 31.
In the traditional technology, a double-Schottky diode circuit is adopted to judge a power supply radio frequency interface, and due to the fact that the forward voltage drop of a diode shortens the discharge time of a super capacitor of an ultrahigh frequency part, stable reading of sensor data in a limited time is difficult.
The embodiment of the invention is provided with the power supply protection module 50, the power supply protection module 50 forms a radio frequency interface selection and power supply protection module through two low-voltage analog switches, so that the problem that the ultrahigh frequency part of the super capacitor cannot be read normally due to too short discharge time caused by forward voltage drop of a Schottky diode is solved; meanwhile, the dual-mode rf sensor 100 is guaranteed to support any one of the ultrahigh frequency and high frequency rf working modes, both the microcontroller module 20 and the sensor module can supply power normally, and the rf module that is not activated is not damaged by reverse power supply.
FIG. 7 is a schematic diagram of an external appearance of a dual mode RF sensor according to an embodiment of the invention; as shown in fig. 7, the high frequency RFID antenna 313 and the ultra high frequency RFID antenna 323 of the dual-mode rf sensor 100 both adopt a PCB antenna design to reduce the package size, and the chip and the resistor and the capacitor are packaged in a patch manner and integrated on a Flexible Printed Circuit Board (FPCB) substrate.
This embodiment is through the integration to miniaturized components and parts at the flexible substrate for sensor integrated level is high, simple structure, miniaturization, light in weight, consequently easily integrates inside being discerned perception article.
FIG. 8 illustrates a block diagram of a dual mode RF sensor system according to an embodiment of the invention; as shown in fig. 8, the dual-mode rf sensor system includes a dual-mode rf sensor 100 and a smart device 200, and the dual-mode rf sensor 100 and the smart device 200 perform rf communication.
In this embodiment, the smart device 200 is a high-frequency or ultra-high-frequency read-write device.
When the intelligent device 200 is a high-frequency read-write device, the intelligent device 200 is matched with the high-frequency module 31 in the dual-mode rf sensor 100, and the current working mode of the rf sensor 100 is a high-frequency mode. The smart device 200 is, for example, a high-frequency RFID reader or an NFC smart phone.
When the smart device 200 is an ultra-high frequency read-write device, the smart device 200 is matched with the ultra-high frequency module 32 in the dual-mode rf sensor 100, and the current working mode of the rf sensor 100 is an ultra-high frequency mode. The smart device 200 includes, for example, a second uhf RFID antenna and an uhf RFID reader connected to each other.
The dual-mode rf sensor system further includes a network device 300 and a network server/database 400, where the network device 300 is connected to the intelligent device 200 to receive rf data, and the network server/database 400 is connected to the network device 300 in data communication for storing rf data.
In the prior art, the RFID sensor data needs special hardware and software systems to complete the identification and sensing functions, and special APP needs to be installed to read and analyze the sensor data, so that the convenience of using the sensor is limited.
According to the embodiment of the invention, the miniaturized components are integrated on the flexible substrate, so that the sensor is high in integration level, simple in structure, miniaturized and light in weight, and is easy to integrate into the identified and sensed object; the working mode is distinguished by judging the voltage of the power supply part, two working modes are supported, and the device is suitable for application occasions combining a far field, a near field and a far field and a near field, and is wide in application range; the method supports a user to complete real-time measurement and tracking of historical data through the smart phone with the NFC function, does not need to additionally install software, and is fast and convenient to use.
FIG. 9 is a flow chart of a method of operation of a dual mode RF sensor in accordance with an embodiment of the present invention; as shown in fig. 9, the working method includes the following steps.
S10: and judging the working mode of the dual-mode radio frequency sensor.
In the embodiment of the invention, the working mode of the mode radio frequency sensor is judged by reading the direct current voltage of the high-frequency module or the ultrahigh-frequency module. When the rectified voltage of the high-frequency module 31 is read, the mode rf sensor is in a high-frequency mode, and when the dc voltage of the ultrahigh-frequency module 32 is read, the mode rf sensor is in an ultrahigh-frequency mode. Specifically, the judgment of the working mode of the dual-mode radio frequency sensor is completed by the microcontroller module.
In the embodiment of the present invention, the method further includes S00: and (5) initializing the system. When the dual-mode radio frequency sensor is read and written by a high-frequency or ultrahigh-frequency radio frequency reader-writer, the system is initialized by recovering and supplying power through radio frequency energy.
Under a high-frequency working mode, the power supply protection module protects the ultrahigh frequency module and prevents reverse power supply from damaging the ultrahigh frequency module; under the ultrahigh frequency working mode, the power supply protection module protects the high-frequency module and prevents reverse power supply from damaging the high-frequency module.
S20: and completing the reading and writing of the radio frequency data according to the current working mode.
FIG. 10 is a flow chart illustrating operation of the dual mode RF sensor in either the high frequency mode or the ultra high frequency mode of operation according to an embodiment of the present invention; as shown in fig. 10, if the current high-frequency operating mode is the high-frequency operating mode, the high-frequency module is initialized and the sensor data is read, and if the high-frequency module is idle, the high-frequency module is closed and the sensor data is updated into the NDEF data segment of the high-frequency RFID chip, and then the radio frequency module function is turned on for the reader to inquire; and if the high-frequency module is performing read-write operation, waiting for the read-write operation to be completed and then performing data updating.
If the current working state is in an ultrahigh frequency mode, initializing an ultrahigh frequency module, reading sensor data, adding the sensor data into an EPCC1G2 encoded user data segment, and waiting for radio frequency read-write interruption; if receiving the interrupt, the radio frequency read-write is enabled to finish the data read-write operation, otherwise, the radio frequency read-write is in a waiting state.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent.
Claims (10)
1. A dual-mode radio frequency identification sensor, characterized by: the sensor includes:
the sensor module is used for realizing data measurement;
the microcontroller module is connected with the sensor module and used for reading the measurement data of the sensor module; and
the radio frequency module is connected with the microcontroller module and is used for realizing radio frequency transmission of measurement data;
the radio frequency module comprises a high-frequency module and an ultrahigh frequency module, and the high-frequency module and the ultrahigh frequency module are both connected with the microcontroller module; and the microcontroller module judges whether the current working mode is a high-frequency mode or an ultrahigh-frequency mode.
2. The dual-mode radio frequency identification sensor of claim 1, wherein: the high-frequency module comprises a high-frequency RFID chip, a first matching circuit connected with the high-frequency RFID chip and a high-frequency RFID antenna connected with the first matching circuit; and the high-frequency RFID chip is connected with the microcontroller module.
3. The dual-mode radio frequency identification sensor of claim 2, wherein: the high-frequency module further comprises a first RF-DC rectifying circuit, and the first RF-DC rectifying circuit is respectively connected with the microcontroller module and the sensor module.
4. The dual-mode radio frequency identification sensor of claim 1, wherein: the ultrahigh frequency module comprises an ultrahigh frequency RFID chip, a second matching circuit connected with the ultrahigh frequency RFID chip and an ultrahigh frequency RFID antenna connected with the second matching circuit; and the ultrahigh frequency RFID chip is connected with the microcontroller module.
5. The dual-mode radio frequency identification sensor of claim 4, wherein: the ultrahigh frequency module further comprises a second RF-DC rectifying circuit, and the second RF-DC rectifying circuit is respectively connected with the microcontroller module and the sensor module.
6. The dual-mode radio frequency identification sensor of claim 5, wherein: the UHF module further comprises a charge management module connected between the second RF-DC rectification circuit and the microcontroller module and sensor module.
7. The dual-mode radio frequency identification sensor of claim 6, wherein: the charge management module comprises a low-voltage charge pump, a super capacitor and a DC-DC voltage stabilizer.
8. The dual-mode radio frequency identification sensor of claim 1, wherein: the dual-mode radio frequency sensor further comprises a power supply protection module, wherein the power supply protection module is used for protecting the high-frequency module and the ultrahigh-frequency module.
9. A dual-mode radio frequency identification sensor system, characterized by: the dual-mode radio frequency identification sensor comprising any of claims 1-8, further comprising a smart device.
10. A working method of a dual-mode radio frequency identification sensor is characterized by comprising the following steps:
judging the working mode of the dual-mode radio frequency sensor;
and completing the reading and writing of the radio frequency data according to the current working mode.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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