Passive electronic tag and radio frequency sensing system
By using a passive electronic tag structure and utilizing radio frequency power supply and communication unit to achieve sensor control, the problems of high power consumption and difficult maintenance in the existing technology are solved, and low-cost, maintenance-free and adaptive sensor power supply is achieved.
Patent Information
- Application Number
- CN202423163124.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-20
AI Technical Summary
Existing RFID tag and sensor solutions require external power supply, resulting in high power consumption, high cost, and difficult maintenance, making it impossible to achieve low-cost, maintenance-free, and adaptive use in lightless environments.
It adopts a passive electronic tag structure, collects radio frequency energy through the radio frequency tag module to power the sensor module, uses redundant power to power the sensor module, and realizes communication between the tag and the sensor through the communication unit, eliminating the need to configure external logic chips and realizing interactive control of the sensor.
This reduces the power consumption of passive electronic tags, simplifies the power supply structure, lowers costs, and improves the system's adaptability and reliability.
Smart Images
Figure CN223598243U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The embodiment of the utility model relates to electronic tag technical field, especially a passive electronic tag and radio frequency sensing system. BACKGROUND
[0002] In the current scheme of using radio frequency identification label (Radio Frequency Identification, RFID) and sensor to detect sensing parameters such as temperature, posture, humidity and air pressure, a microcontroller is often needed to be matched for use, and the working of the sensor is controlled through the microcontroller. This undoubtedly increases the power consumption of the whole system, so an external power supply needs to be configured for power supply, but the power supply scheme is concentrated in power supply, battery, solar energy and the like. Due to wiring, battery or requirement for ambient light, these schemes cannot achieve the use of low cost, maintenance-free, self-adaptive or no light environment. UTILITY MODEL CONTENT
[0003] The utility model provides a passive electronic tag and radio frequency sensing system, does not need to configure external initiative logic chip, has reduced the power consumption of passive electronic tag.
[0004] In the first aspect, the utility model embodiment provides a passive electronic tag, comprising: antenna module, radio frequency label module and sensing module;
[0005] The radio frequency label module is connected with the antenna module, and the power output end of the radio frequency label module is connected with the power end of the sensing module;The radio frequency label module comprises a communication unit, and the radio frequency label module is connected with the sensing module in communication through the communication unit.
[0006] Optionally, the working voltage of the sensing module is less than or equal to the output voltage of the power output end of the radio frequency label module.
[0007] Optionally, the communication unit at least comprises a serial peripheral interface.
[0008] Optionally, the sensing module comprises at least one of a pressure sensor, a temperature and humidity sensor, a gas sensor, an acceleration sensor and a posture sensor.
[0009] Optionally, the passive electronic tag further comprises an energy collection circuit module;The power output end of the radio frequency label module is connected with the power input end of the energy collection circuit module, and the power output end of the energy collection circuit module is connected with the power end of the sensing module and the power input end of the radio frequency label module respectively.
[0010] Optionally, the passive electronic tag further comprises a current limiting module, and the power input end of the radio frequency tag module and the power output end of the energy collection circuit module are provided with the current limiting module.
[0011] Optionally, the power input end of the radio frequency tag module and the power output end of the radio frequency tag module are configured as a same power port, and the passive electronic tag further comprises an anti-backflow module, and the power output end of the energy collection circuit module and the power port are provided with the anti-backflow module.
[0012] In a second aspect, the utility model embodiment provides a radio frequency sensing system, comprising: a reader and the passive electronic tag of any embodiment of the utility model;
[0013] The reader is in communication connection with the radio frequency tag module through the antenna module.
[0014] Optionally, the reader is an ultra-high frequency reader.
[0015] Optionally, the radio frequency sensing system further comprises a host computer, and the host computer is in communication connection with the reader.
[0016] The technical scheme provided by the utility model embodiment generates electric energy through the radio frequency tag module to collect radio frequency energy, uses the electric energy to supply power to the radio frequency tag module, further uses redundant electric energy to supply power to the sensing module, and realizes the communication connection between the sensing module and the radio frequency tag module through the communication unit, realizes the process that the interactive instruction received by the radio frequency tag module is issued to the sensing module and the sensing information of the sensing module is sent to the radio frequency tag module, therefore, the control application for the sensing module does not need to configure external active logic chip again, and the power consumption of the passive electronic tag is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 A structure schematic diagram of a passive electronic tag is provided for the utility model embodiment.
[0018] Figure 2 A structure schematic diagram of another passive electronic tag is provided for the utility model embodiment.
[0019] Figure 3 A structure schematic diagram of another passive electronic tag is provided for the utility model embodiment.
[0020] Figure 4 A structure schematic diagram of a radio frequency sensing system is further provided for the utility model embodiment. DETAILED DESCRIPTION
[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.
[0022] In the scheme of detecting sensing parameters such as temperature, posture, humidity and air pressure by using RFID tags and sensors, a control module such as a microcontroller is usually configured to control the RFID tags and sensors and other devices, which leads to large power consumption of the RFID tags, and an external power supply or a self-provided battery is required for power supply. However, the implementation circuit is complex by using the pull power mode, the cost is high, and there are certain electrical safety hazards and other shortcomings, and the self-provided battery mode involves the maintenance of battery endurance, resulting in poor device reliability.
[0023] Therefore, Figure 1 The utility model provides a kind of structure schematic diagram of passive electronic tag for the embodiments of the utility model, referring to Figure 1 , comprising: antenna module 110, radio frequency tag module 120 and sensing module 130;
[0024] Radio frequency tag module 120 is connected with antenna module 110, and the power output end of radio frequency tag module 120 is connected with the power end of sensing module 130;Radio frequency tag module 120 includes communication unit 121, and radio frequency tag module 120 is communicatedly connected with sensing module 130 by communication unit 121.
[0025] Specifically, antenna module 110 can convert radio frequency signal into signal form suitable for radio frequency tag module 120 identification, and also can convert the signal sent by radio frequency tag module 120 into radio frequency signal and transmit to corresponding reader. Radio frequency tag module 120 receives and radiates electromagnetic wave signal by antenna module 110, realizes wireless read-write to the information stored in label. For passive radio frequency tag module 120, energy is obtained from electromagnetic wave environment by antenna module 110 to start the work of relevant circuit. When antenna module 110 receives electromagnetic wave signal, electromagnetic wave signal is converted into alternating current energy by inductive coil and resonance circuit, and radio frequency tag module 120 is powered, and self-energy supply is realized.
[0026] In the passive electronic tag, a plurality of low-power sensing modules 130 can be integrated, such as pressure sensors, temperature and humidity sensors, gas sensors, acceleration sensors, and attitude sensors, etc., wherein the sensing modules 130 can adopt low-power sensors. The power output end of the radio frequency tag module 120 is connected with the power end of the sensing module 130, that is, the radio frequency tag module 120 supplies power to the sensing module 130 by using redundant power. For example, the radio frequency tag module 120 can adopt an RFID tag chip. For the RFID tag chip, the power consumption is less than 10uW, and the power output end of the RFID tag chip can generally achieve a working parameter output of 2V, 50Ua. By selecting the sensing module 130, a low-power sensor can be obtained. For the working parameter output of 2V, 50Ua of the RFID tag chip, the minimum working voltage of the sensor can be a voltage less than 2V, such as 1.6V. The sensor continuously samples the entire system current in full-speed mode, which is less than 50Ua, such as 30ua. The sensor can be powered by the power generated by the radio frequency tag module 120, that is, the sensing parameter detection can be realized in the passive state. For example, in the above embodiment, the sensing module 130 can adopt an ADXL362 type sensor.
[0027] The radio frequency tag module 120 is also in communication connection with the sensing module 130 through the communication unit 121. For example, the communication unit 121 can provide a serial peripheral interface (SPI) and the like. By using the communication unit 121, various sensing modules 130 that meet the connection requirements can be conveniently and efficiently connected, and the communication connection between the sensing module 130 and the radio frequency tag module 120 can be realized. Therefore, through the communication unit 121, the radio frequency tag module 120 and the sensing module 130 can form a master-slave communication connection, that is, the interactive command can be issued to the sensing module 130 through the radio frequency tag module 120 to realize the control function, and the sensing information of the sensing module 130 can be sent to the radio frequency tag module 120, and then sent out by the radio frequency tag module 120.
[0028] In application, the radio frequency tag module 120 can be directly operated by the reader, which is equivalent to a traditional passive electronic tag in function, and inventory tags and reading and writing tag memories can be realized. The reader can also send specific interaction instructions, which are then issued by the radio frequency tag module 120 to the sensing module 130, to realize access of the sensing module 130, and the radio frequency tag module 120 sends the sensing information of the sensing module 130 to the reader, so as to realize reading of the measurement value of the sensor. For example, the reader sends a control instruction for obtaining sensing information, the sensing module 130 performs corresponding operations to send the sensing information to the radio frequency tag module 120, and the radio frequency tag module 120 sends the sensing information to the reader through a radio frequency signal, so that the sensing parameter of the sensing module 130 can be obtained. The communication unit 121 provides a more convenient way for data interaction, so as to realize interaction between the radio frequency tag module 120 and the sensing module 130, without the need to configure an external active logic chip such as an MCU or an FPGA, thereby reducing the power consumption of the passive electronic tag.
[0029] The technical scheme provided by the embodiment of the utility model realizes self-power supply of the radio frequency tag module 120 by collecting radio frequency energy to generate electric energy, and also supplies power to the sensing module 130 by using redundant electric energy, and realizes communication connection between the sensing module 130 and the radio frequency tag module 120 through the communication unit 121, so that the process of issuing the interaction instruction received by the radio frequency tag module 120 to the sensing module 130 and sending the sensing information of the sensing module 130 to the radio frequency tag module 120 is realized. Therefore, the active logic chip does not need to be configured externally for control of the sensing module 130, and the power consumption of the passive electronic tag is reduced.
[0030] Optionally, the working voltage of the sensing module 130 is less than or equal to the output voltage of the power supply output end of the radio frequency tag module 120. Specifically, for the passive radio frequency tag module 120, the antenna module 110 obtains energy from an electromagnetic wave environment to start the work of related circuits. After the antenna module 110 receives the electromagnetic wave signal, the electromagnetic wave signal is converted into alternating current energy through an induction coil and a resonance circuit to supply power to the circuit in the radio frequency tag module 120, so as to realize self-power supply. The sensing module 130 can adopt a low-power sensor. The radio frequency tag module 120 supplies power to the sensing module 130 by using redundant electric energy.
[0031] The radio frequency tag module 120 can adopt an RFID tag chip. For the RFID tag chip, the power output end of the RFID tag chip can generally achieve a working parameter output of 2V, 50Ua, and through selection of the sensing module 130, a low-power sensor can be obtained. For the working parameter output of 2V, 50Ua of the RFID tag chip, the minimum working voltage of the sensor can be a voltage less than 2V, for example, 1.6V, the entire system current of the sensor is less than 50Ua, for example, 30ua, in a full-speed mode continuous sampling, and the sensing module 130 can be powered by the power generated by the radio frequency tag module 120, that is, the detection of the sensing parameter can be realized in a passive state.
[0032] Figure 2 Another structure diagram of the passive electronic tag is provided for the embodiment of the utility model, and referring to Figure 2 The passive electronic tag further comprises an energy collection circuit module 140.
[0033] The power output end Vout2 of the radio frequency tag module 120 is connected with the power input end Vin1 of the energy collection circuit module 140, and the power output end Vout1 of the energy collection circuit module 140 is respectively connected with the power end SUPPLY of the sensing module 130 and the power input end Vin2 of the radio frequency tag module 120.
[0034] Specifically, the energy obtained by the radio frequency tag module 120 from the electromagnetic wave environment can also be input to the energy collection circuit module 140, and the energy collection circuit module 140 converts the radio frequency energy collected by the radio frequency tag module 120 into a suitable working voltage, for example, a working voltage range of 1.2V-3.3V, through storage, voltage conversion and other processes, so as to drive the sensing module 130. In some embodiments, the maximum drivable load of the energy collection circuit module 140 output reaches 80mA@3.3V, so that a plurality of low-power sensing modules 130 can be integrated in the passive electronic tag, the selection of the sensor is no longer limited by the power consumption, and the working of most sensors can be supported. After the energy collection circuit module 140 completes the charging work, the pin output of the energy collection circuit module 140 can output a configurable voltage to power the radio frequency tag module 120, so that the radio frequency tag module 120 works in an active mode, thereby improving the sensitivity of the radio frequency tag module 120.
[0035] The technical scheme provided by the embodiment of the utility model, through radio frequency label module 120 collection radio frequency energy, use energy collection circuit module 140 with radio frequency label module 120 collection radio frequency energy, through storage, voltage conversion process is converted into suitable working voltage, to drive radio frequency label module 120 and or sensing module 130 can, can use the electromagnetic field energy in space realizes self-powered, simple structure, low cost. At the same time improve the driving load capacity, and still can make radio frequency label module 120 work in active mode, and then improve detection sensitivity.
[0036] Continuing to refer to Figure 2 Optionally, the passive electronic tag further comprises a current limiting module 150, and the power input end Vin2 of the radio frequency label module 120 and the power output end Vout1 of the energy collection circuit module 140 are provided with the current limiting module 150. By setting the current limiting module 150, the current output by the energy collection circuit module 140 into the radio frequency label module 120 is prevented from being too large, so as to prevent the radio frequency label module 120 from being damaged, thereby playing a protection role.
[0037] Figure 3 For another structure diagram of the passive electronic tag of the embodiment of the utility model, referring to Figure 3 , the power input end Vin2 and the power output end Vout2 of the radio frequency label module 120 are configured as the same power port VDD, and the passive electronic tag further comprises an anti-backflow module 210, and the power output end Vout1 of the energy collection circuit module 140 and the power port VDD are provided with the anti-backflow module 210.
[0038] Specifically, the power port VDD of the radio frequency tag module 120 can be directly connected to the power output end Vout1 of the energy collection circuit module 140, and power is provided for the logic circuit, digital circuit or analog circuit inside the chip through the power distribution network inside the radio frequency tag module 120, so that the radio frequency tag module 120 can work in an active mode. The energy collected by the radio frequency tag module 120 through the antenna module 110 can be input to the power input end Vin1 of the energy collection circuit module 140 through the power port VDD, and the power output is realized through the circuit design inside the radio frequency tag module 120 and the internal power management logic. At this time, the current limiting module 150 between the power port VDD of the radio frequency tag module 120 and the power output end Vout1 of the energy collection circuit module 140 simultaneously limits the current to the power port VDD and the power input end Vin1 of the energy collection circuit module 140. The power output end Vout1 of the energy collection circuit module 140 is provided with the anti-backflow module 210, which can avoid the current flowing back to the power output end Vout1 of the energy collection circuit module 140 when the power port VDD of the radio frequency tag module 120 is used as the power output, thereby protecting the circuit and the equipment from damage. Exemplarily, the anti-backflow module 210 can realize the anti-backflow function by using a switching circuit, for example, a unidirectional diode and a MOSFET switch tube.
[0039] Figure 4 The utility model embodiment further provides a kind of structure schematic diagram of radio frequency sensing system, referring to Figure 4 , comprising: reader-writer 310 and the passive electronic tag of any embodiment of the utility model;
[0040] Reader-writer 310 is communicatedly connected with radio frequency tag module 120 by antenna module 110.
[0041] Specifically, in application, radio frequency tag module 120 can be directly operated using reader-writer 310, which is equivalent to traditional passive electronic tag in function, and inventory tag, reading and writing tag memory can be realized. Specific interaction instructions can also be sent by reader-writer 310, and then sent to sensing module 130 by radio frequency tag module 120, to realize the access of sensing module 130, and then the sensing information of sensing module 130 is sent to reader-writer 310 by radio frequency tag module 120, to realize reading the sensing information of sensor. For example, control instructions for obtaining sensing information are sent by reader-writer 310, sensing module 130 executes corresponding operation to send sensing information to radio frequency tag module 120, and radio frequency tag module 120 sends to reader-writer 310 by radio frequency signal, and communication unit 121 provides more convenient way for data interaction, to realize the interaction between radio frequency tag module 120 and sensing module 130, without configuring external active logic chip, such as MCU, FPGA, etc., to reduce the power consumption of passive electronic tag.
[0042] Optionally, the radio frequency sensing system further comprises a host computer 320; the host computer 320 is in communication connection with the reader 310; the reader 310 can send the sensing information to the host computer 320 again, write into the EEPROM of the host computer 320 or the internal register of the digital baseband, and then calculate the measurement value of the sensing module 130 according to the sensing information by using the pre-stored algorithm of the host computer 320. Exemplarily, the reader 310 can adopt an ultra-high frequency reader; the ultra-high frequency reader has the advantages of long-distance reading, high-speed data transmission and strong anti-interference capability.
[0043] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims
1. A passive electronic tag, characterized in that, include: Antenna module, RFID tag module, and sensor module; The RFID tag module is connected to the antenna module, and the power output terminal of the RFID tag module is connected to the power output terminal of the sensing module; the RFID tag module includes a communication unit, and the RFID tag module communicates with the sensing module through the communication unit.
2. The passive electronic tag according to claim 1, characterized in that, The operating voltage of the sensing module is less than or equal to the output voltage of the power supply terminal of the RFID tag module.
3. The passive electronic tag according to any one of claims 1-2, characterized in that, The communication unit includes at least a serial peripheral interface.
4. The passive electronic tag according to claim 1, characterized in that, The sensing module includes at least one of a pressure sensor, a temperature and humidity sensor, a gas sensor, an acceleration sensor, and an attitude sensor.
5. The passive electronic tag according to claim 3, characterized in that, It also includes an energy harvesting circuit module; the power output terminal of the RFID tag module is connected to the power input terminal of the energy harvesting circuit module, and the power output terminal of the energy harvesting circuit module is connected to the power terminal of the sensing module and the power input terminal of the RFID tag module respectively.
6. The passive electronic tag according to claim 5, characterized in that, It also includes a current limiting module, which is installed between the power input terminal of the RFID tag module and the power output terminal of the energy harvesting circuit module.
7. The passive electronic tag according to claim 6, characterized in that, The power input terminal and the power output terminal of the RFID tag module are configured to the same power port. The passive electronic tag also includes an anti-backflow module, which is provided between the power output terminal of the energy harvesting circuit module and the power port.
8. A radio frequency sensing system, characterized in that, include: The reader and the passive electronic tag according to any one of claims 1-7; The reader / writer is communicatively connected to the RFID tag module via the antenna module.
9. The radio frequency sensing system according to claim 8, characterized in that, The reader / writer is an ultra-high frequency reader / writer.
10. The radio frequency sensing system according to claim 9, characterized in that, It also includes a host computer; the host computer is communicatively connected to the reader / writer.