NFC (Near Field Communication) secure sealing paste circuit for take-out packaging

Abstract

The invention belongs to the technical field of green packaging materials, and particularly relates to an NFC secure sealing paste circuit for take-out packaging, which comprises a coil antenna, an NFC customized baseband circuit and memory particles, the coil antenna is used for receiving and sending modulation carrier waves with the frequency band of 13.56 MHz so as to achieve communication with NFC read-write equipment, and the NFC secure sealing paste circuit can detect and record whether a package is opened after meal delivery, the sealing time, meal delivery waiter information, take-out person information and customized address information of customers. After the customer takes out the food, the customer can know the information of the food only by dropping the NFC of the mobile phone. Meanwhile, when the take-out receipt is damaged or dirty, the take-out staff and the customer can conveniently confirm the take-out information and even cancel the take-out receipt, paperless meal delivery is achieved, and meanwhile when quality dispute occurs to the meal, tracing can be conducted, and the rights and interests of the customer and the merchant are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of green packaging materials, and in particular to an NFC safe sealing sticker circuit for take-out packaging. Background Art

[0002] In recent years, with the development of the Internet, people's lives have become more and more convenient, and many new lifestyles have also emerged. Takeaway has undoubtedly greatly facilitated our lives, and it is also a convenient lifestyle that contemporary young people cannot do without.

[0003] However, with the explosive growth of the food delivery industry, some irregular, uncivilized and unhygienic phenomena are inevitable, such as whether the food delivery packaging is opened during the delivery process and how to trace the source of the food delivery if there are quality problems.

[0004] To this end, an NFC safe sealing sticker circuit for take-out packaging is proposed to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide an NFC safety sealing sticker circuit for take-out packaging to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an NFC safety sealing sticker circuit for take-out packaging, comprising a coil antenna, an NFC customized baseband circuit and a memory particle; the coil antenna is used to receive and send a modulated carrier in the 13.56MHz frequency band to achieve communication with an NFC reader / writer; the NFC customized baseband circuit comprises an analog rectifier circuit, a modulation and demodulation circuit, a digital baseband clock generation circuit, a tag state sensing circuit and a digital part of state sensing quantization, tag initialization, carrier self-decoding, NFC main state control, output coding control, automatic power consumption control and a storage particle interface; the memory particle adopts a non-volatile EEPROM.

[0007] Preferably, the NFC customized baseband circuit includes an NFC circuit unit, which requires an activation instruction. When not activated, the tag can only perform simple handshake communication with the NFC reader / writer device, and will not record the tag status. After sending the activation instruction, that is, tapping the NFC reader / writer device when serving the food, the required information, such as sealing time, food server information, delivery man information and customer's customized address information, will be written into the tag's designated storage area, and the tag sealing status information STATE_TAG will be recorded as TRUE, indicating that it has been sealed. After activation, the status cannot be changed by the NFC reader / writer device, and can only be automatically detected and changed by the status sensing circuit in the hardware circuit.

[0008] Preferably, the state sensing circuit determines the tag state by capacitance quantization, thereby changing the STATE_TAG information to FALSE, or maintaining TRUE.

[0009] Preferably, the coil antenna, NFC customized baseband circuit and memory particles need to be arranged inside the sealing sticker. The sealing sticker is a capacitance-sensitive conductive material. When it is torn off after pasting, the capacitance therein will change significantly. Therefore, when the customer reads and writes the tag information, the FALSE value of STATE_TAG is sent to the user, and the tag in the activated state, once STATE_TAG is written to FALSE, will no longer be rewritten to TRUE to prevent tampering.

[0010] Preferably, the sealing sticker needs to ensure waterproofness, moisture-proofness and possess certain mechanical strength, and a protective layer needs to be provided on the outside thereof, covered with a layer of transparent or colored protective film to prevent external physical damage and environmental influences.

[0011] Preferably, the coil antenna is based on the principle of electromagnetic induction and transmits energy and data through coupling between two coils. When the NFC reader / writer is close to the sealing sticker, its built-in transmitting coil will generate an alternating magnetic field, which will induce current in the receiving coil of the sealing sticker, thereby activating the NFC chip and exchanging data; the coil antenna is usually printed with conductive ink, etched with copper foil, or a suitable flexible substrate material is selected.

[0012] Preferably, when selecting the NFC tag chip, it is necessary to select an NFC tag chip with extremely low static current consumption, such as NXP's NTAG21x series or STMicroelectronics' ST25TA series, and ensure that the selected chip has EEPROM or other forms of non-volatile memory for storing data such as unique identifiers and order information; and supports standard NFC Forum Type 2 or Type 4 protocols.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The NFC safe sealing sticker circuit in this application can detect and record whether the package has been opened after the meal is served, the sealing time, the serving waiter information, the deliveryman information, and the customer's customized address information. After the customer gets the takeaway, he only needs to tap the NFC on his mobile phone to know the information of the meal. At the same time, when the takeaway receipt is damaged or dirty, it is convenient for the deliveryman and the customer to confirm the takeaway information, and even cancel the takeaway receipt to achieve paperless meal delivery. At the same time, when there is a quality dispute over the meal, it can be traced to the source to ensure the rights and interests of customers and merchants. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 This is a module composition diagram of the present invention. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] Example:

[0020] See also Figure 1-2 , the present invention provides a technical solution:

[0021] An NFC safe sealing sticker circuit for take-out packaging comprises a coil antenna, an NFC customized baseband circuit and memory particles; the coil antenna is used to receive and send a modulated carrier wave in the 13.56MHz frequency band to achieve communication with an NFC reader / writer; the NFC customized baseband circuit comprises an analog rectification circuit, modulation and demodulation, a digital baseband clock generation circuit, a tag state sensing circuit and digital part state sensing quantization, tag initialization, carrier self-decoding, NFC main state control, output coding control, power consumption automatic control and a memory particle interface; the memory particle adopts a non-volatile EEPROM.

[0022] The NFC customized baseband circuit includes an NFC circuit unit, which requires an activation instruction. When not activated, the tag can only perform simple handshake communication with the NFC reader / writer device and will not record the tag status. After sending the activation instruction, that is, tapping the NFC reader / writer device when serving the food, the required information, such as sealing time, food server information, delivery staff information and customer's customized address information, will be written into the tag's designated storage area. At the same time, the tag sealing status information STATE_TAG will be recorded as TRUE, indicating that it has been sealed. After activation, the status cannot be changed by the NFC reader / writer device and can only be automatically detected and changed by the status sensing circuit in the hardware circuit.

[0023] The NFC circuit unit includes an NFC controller, a radio frequency front end, a coil antenna interface, power management, data storage and management, security and encryption, and status indication and feedback;

[0024] The NFC controller needs to select a dedicated NFC controller chip that complies with the ISO / IEC 14443 standard or other related NFC protocols, such as NXP's PN512, STMicroelectronics' ST25R3911B, etc. Its functions support modulation modes such as ASK (amplitude shift key modulation) and FSK (frequency shift keying), which are used for sending and receiving wireless signals. It has a built-in complete NFC protocol stack, which can automatically identify and respond to different types of commands and data packets, and ensure the correct selection and processing of target tags when multiple tags appear in the reader range at the same time.

[0025] The LC matching network is designed in the RF front end to optimize the impedance matching between the antenna and the NFC controller, improve the energy transmission efficiency, integrate a bandpass or low-pass filter, remove unnecessary frequency components, reduce interference and improve the signal-to-noise ratio. For some application scenarios, it may be necessary to add these components to enhance the transmission power or receiving sensitivity;

[0026] The coil antenna interface converts the AC voltage sensed from the coil antenna into a stable DC voltage for use by the NFC controller and other circuits, prevents the overvoltage caused by the strong magnetic field from damaging sensitive electronic components, monitors the current change in the coil, helps determine whether an external device is approaching, and triggers the corresponding wake-up action;

[0027] In the power management described above, most NFC tags adopt a battery-free design and rely on the electromagnetic field generated by the reader for power. Therefore, an efficient energy harvesting circuit is required to ensure that a stable output voltage can be provided even at a lower input voltage to meet the working requirements of the NFC controller. For some special applications, a small supercapacitor or thin-film battery can be considered as a backup power source to extend the working time or support additional functions;

[0028] The data storage and management, such as EEPROM, FRAM, etc., is used to store important data such as unique identifier (UID), order information, etc., reasonably divide the storage space, define different permission levels, and ensure that only authorized operations can modify key data.

[0029] The security and encryption mentioned above integrate encryption algorithms such as AES-128 and SHA-256 to ensure that the stored data will not be tampered with or stolen during transmission; support two-way authentication to enhance the security of the system, provide a secure key generation, storage and update mechanism to prevent unauthorized access.

[0030] In status indication and feedback, although the sealing sticker itself does not require visual feedback in most cases, for some advanced versions, a small LED or segment LCD can be added to display simple status information, such as "scanned", "not damaged", etc.; also as a function to enhance the user experience, a micro buzzer can be integrated to emit a short sound signal to confirm that the operation is successful.

[0031] The state sensing circuit determines the tag state by means of capacitance quantization, thereby changing the STATE_TAG information to FALSE, or maintaining TRUE.

[0032] The coil antenna, NFC customized baseband circuit and memory particles need to be set inside the sealing sticker. The sealing sticker is a capacitance-sensitive conductive material. If it is torn off after pasting, the capacitance therein will change significantly. Therefore, when the customer reads and writes the tag information, the FALSE value of STATE_TAG is sent to the user, and the tag in the activated state, once STATE_TAG is written to FALSE, it can no longer be copied to TRUE to prevent tampering.

[0033] The sealing sticker needs to ensure waterproofness, moisture-proofness and possess certain mechanical strength, and a protective layer needs to be provided on the outside thereof, covered with a layer of transparent or colored protective film to prevent external physical damage and environmental influences.

[0034] The seal needs to be designed with special tear lines or fragile connection points. When the seal is forcibly opened, the internal circuit will be broken, causing the NFC tag to fail. In this way, you can scan it with your mobile phone to confirm whether the seal is intact;

[0035] If you need to monitor the temperature changes during food transportation, you can embed a micro temperature sensor in the sealing sticker to record temperature data during critical time periods. For certain foods that are sensitive to humidity, you can also consider adding a humidity sensing function to further ensure food safety.

[0036] The coil antenna is based on the principle of electromagnetic induction and transmits energy and data through the coupling between two coils. When the NFC reader / writer is close to the sealing sticker, its built-in transmitting coil will generate an alternating magnetic field, which will induce current in the receiving coil of the sealing sticker, thereby activating the NFC chip and exchanging data. The coil antenna is usually printed with conductive ink and etched with copper foil (which can provide good conductivity and can be easily integrated into paper or plastic substrates) or a suitable flexible substrate material is selected (to ensure that the antenna can maintain good performance when bent or folded).

[0037] The shape of the coil antenna is circular or rectangular, depending on the requirements of the actual application scenario. The circular antenna has better directionality and more uniform magnetic field distribution; while the rectangular antenna is more suitable for specific space constraints.

[0038] To maximize power transfer efficiency, it is necessary to ensure that the input impedance of the antenna matches the NFC chip. The impedance characteristics can be adjusted by adding series resistors, capacitors, or inductors. The appropriate Q factor (quality factor) helps improve the selectivity and sensitivity of the antenna. Too high a Q value will result in a narrow bandwidth and affect multi-band compatibility; too low a Q value will reduce signal strength. Therefore, it is necessary to determine the optimal Q value range through experiments; consider the impact of the surrounding environment on the antenna performance, such as reflection or absorption problems that may be caused by metal objects. A layer of shielding material (such as a ferrite sheet) can be added to the back of the antenna to reduce external interference and protect the internal circuit;

[0039] When selecting the NFC tag chip, it is necessary to select an NFC tag chip with extremely low static current consumption, such as NXP's NTAG21x series or STMicroelectronics' ST25TA series. These chips usually adopt a battery-free design and rely on the electromagnetic field generated by the reader for power supply. Ensure that the selected chip has EEPROM or other forms of non-volatile memory to store data such as unique identifiers and order information; at the same time, support standard NFC Forum Type 2 or Type 4 protocols. The NFC chip needs to have a unique serial number built in, which can be used to uniquely identify each sealing sticker; support data writing and reading operations to store relevant information.

[0040] A rectifier circuit is designed to convert the AC voltage induced by the coil antenna into a DC voltage, and a voltage regulator circuit is used to maintain a stable output voltage for use by the NFC chip and other components. Efficient energy harvesting technology is used to maximize the energy utilization obtained from the reader / writer, reduce the requirements for magnetic field strength, and thus expand the effective reading and writing distance.

[0041] The storage space is reasonably divided according to application requirements. For example, the fixed area is used to store UID and other immutable information, and the programmable area is used to record dynamic data such as order details and timestamps. Encryption algorithms such as AES-128 are integrated to ensure that the stored data will not be tampered with or stolen during transmission; two-way authentication is supported to enhance the security of the system.

[0042] Although in most cases the seal itself does not require visual feedback, for some advanced versions, a small LED or segment LCD can be added to display simple status information, such as "scanned", "not damaged", etc. Also as a function to enhance the user experience, a micro buzzer can be integrated to emit a short sound signal to confirm that the operation is successful.

[0043] When selecting a memory, you can choose an electrically erasable programmable read-only memory, a ferroelectric random access memory, or a magnetoresistive random access memory; the electrically erasable programmable read-only memory is characterized by non-volatile storage, which can save data even when the power is off, and supports multiple read and write operations; the ferroelectric random access memory has the advantages of both the speed of RAM and non-volatile storage, and has extremely high write durability and fast data access speed; the magnetoresistive random access memory is characterized by non-volatility, high speed, low power consumption, high-density integration, and almost unlimited read and write cycles; in terms of capacity selection, for simple applications, such as only storing the UID and a small amount of fixed information, you can choose a small-capacity EEPROM of 64 bytes to 512 bytes. If you need to additionally record dynamic data (such as sensor information such as temperature and humidity), you can consider a medium-capacity memory of 1KB to 4KB. For more complex applications, such as long-term logging or image storage, a larger-capacity memory may be required, but this is usually not suitable for disposable sealing stickers.

[0044] Ensure that the selected memory can maintain data integrity over a wide operating temperature range (-40°C to +85°C) and a data retention period of at least 10 years. Some memories provide hardware or software write protection to prevent accidental modification of important data. Some high-end memories have built-in ECC functions to improve data reliability, especially for mission-critical applications.

[0045] Considering the space limitation of the sealing tape, a miniaturized package should be selected, such as DFN (Dual Flat No-lead), WLCSP (wafer-level chip size package), etc., with the thickness as thin as possible; it should have sufficient ESD (electrostatic discharge) protection level to ensure that it is not damaged by static electricity during production and use. Make sure that the selected memory complies with industry standard interface protocols (such as I 2 C, SPI) to facilitate seamless connection with NFC chips and other control units; give priority to products that are widely supported and market-proven to ensure that they can work well with other brands of equipment.

[0046] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An NFC safety seal circuit for take-out packaging, characterized in that: It includes a coil antenna, a NFC customized baseband circuit and a memory chip; the coil antenna is used to receive and send a modulated carrier wave in the 13.56MHz frequency band to achieve communication with an NFC reader / writer device; The NFC customized baseband circuit includes an analog rectification circuit, a modulation and demodulation circuit, a digital baseband clock generation circuit, a tag state sensing circuit, and state sensing quantization of the digital part, tag initialization, carrier self-decoding, NFC main state control, output coding control, automatic power consumption control and a storage particle interface; the storage particle adopts a non-volatile EEPROM.

2. The NFC safety seal circuit for take-out packaging according to claim 1, characterized in that: The NFC customized baseband circuit includes an NFC circuit unit, which requires an activation instruction. When not activated, the tag can only perform simple handshake communication with the NFC reader / writer device and will not record the tag status. After sending the activation instruction, that is, tapping the NFC reader / writer device when serving the food, the required information, such as sealing time, food server information, delivery staff information and customer's customized address information, will be written into the tag's designated storage area. At the same time, the tag sealing status information STATE_TAG will be recorded as TRUE, indicating that it has been sealed. After activation, the status cannot be changed by the NFC reader / writer device and can only be automatically detected and changed by the status sensing circuit in the hardware circuit.

3. The NFC safety seal circuit for take-out packaging according to claim 1, characterized in that: The state sensing circuit determines the tag state by means of capacitance quantization, thereby changing the STATE_TAG information to FALSE, or maintaining TRUE.

4. The NFC safety seal circuit for take-out packaging according to claim 1, characterized in that: The coil antenna, NFC customized baseband circuit and memory particles need to be set inside the sealing sticker. The sealing sticker is a capacitance-sensitive conductive material. If it is torn off after pasting, the capacitance therein will change significantly. Therefore, when the customer reads and writes the tag information, the FALSE value of STATE_TAG is sent to the user, and the tag in the activated state, once STATE_TAG is written to FALSE, it can no longer be copied to TRUE to prevent tampering.

5. The NFC safety seal circuit for take-out packaging according to claim 4, characterized in that: The sealing sticker needs to ensure waterproofness, moisture-proofness and possess certain mechanical strength, and a protective layer needs to be provided on the outside thereof, covered with a layer of transparent or colored protective film to prevent external physical damage and environmental influences.

6. The NFC safety seal circuit for take-out packaging according to claim 1, characterized in that: The coil antenna is based on the principle of electromagnetic induction and transmits energy and data through the coupling between two coils. When the NFC reader / writer is close to the sealing sticker, its built-in transmitting coil will generate an alternating magnetic field, which will induce current in the receiving coil of the sealing sticker, thereby activating the NFC chip and exchanging data; the coil antenna is usually printed with conductive ink, etched with copper foil, or a suitable flexible substrate material is selected.

7. The NFC safety seal circuit for take-out packaging according to claim 1, characterized in that: When selecting the NFC tag chip, it is necessary to select an NFC tag chip with extremely low static current consumption, such as NXP's NTAG21x series or STMicroelectronics' ST25TA series. Ensure that the selected chip has EEPROM or other forms of non-volatile memory for storing unique identifiers, order information and other data; and support standard NFC Forum Type 2 or Type 4 protocols.

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