CN114548129A - NFC accurate alignment method, terminal, tag, device and storage medium - Google Patents

NFC accurate alignment method, terminal, tag, device and storage medium Download PDF

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Publication number
CN114548129A
CN114548129A CN202011339871.8A CN202011339871A CN114548129A CN 114548129 A CN114548129 A CN 114548129A CN 202011339871 A CN202011339871 A CN 202011339871A CN 114548129 A CN114548129 A CN 114548129A
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nfc
terminal
tag
nfc tag
field intensity
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王磊
黄昱
张坤
赵晶剑
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Shanghai Fudan Microelectronics Group Co Ltd
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Shanghai Fudan Microelectronics Group Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • 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
    • G06K7/10297—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 arrangements for handling protocols designed for non-contact record carriers such as RFIDs NFCs, e.g. ISO/IEC 14443 and 18092
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Health & Medical Sciences (AREA)
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  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

The embodiment of the invention provides an NFC accurate alignment method, a terminal, a tag, a device and a storage medium. The NFC accurate alignment method applicable to the NFC terminal comprises the following steps: s101, sending an electromagnetic field to an NFC tag and establishing a near field communication connection with the NFC tag; s102, sending a field intensity detection instruction to the NFC label; s103, receiving field intensity information returned by the NFC label based on the field intensity detection instruction, wherein the field intensity information comprises the current magnetic field intensity of an electromagnetic field received by the NFC label from the NFC terminal; and S104, judging whether the current magnetic field strength reaches a threshold value, if so, determining that the NFC terminal is accurately aligned with the NFC tag, and if not, returning to the step S102 or the step S103. By adopting the scheme provided by the embodiment of the invention, the NFC terminal and the NFC tag can realize accurate alignment, so that the energy of the electromagnetic field received by the NFC tag from the NFC terminal is larger.

Description

NFC accurate alignment method, terminal, tag, device and storage medium
Technical Field
The invention relates to the technical field of near field communication, in particular to a method, a terminal, a tag, a device and a storage medium for NFC accurate alignment.
Background
Near Field Communication (NFC) is an emerging technology developed by combining a wireless interconnection technology with a non-contact radio frequency identification technology, and provides a very safe and fast Communication mode for various electronic products which are increasingly popularized in daily life.
Particularly, the passive tag based on NFC communication does not need external power supply, and can collect energy of an electromagnetic field emitted by an NFC terminal to drive various passive devices. For example, both the NFC passive electronic lock and the NFC passive driving ink screen drive the motor or the ink screen by collecting energy of an electromagnetic field emitted by a smartphone with an NFC function, so as to unlock the lock or refresh display content of the ink screen.
However, since the electronic lock needs to be driven to unlock or the ink screen needs to refresh the display content, the field energy emitted by the NFC mobile phone is limited, and the transmission power of different NFC mobile phones is different, in order to achieve the purpose of unlocking or refreshing the screen, the NFC antenna position of the mobile phone needs to be accurately aligned with the tag antenna position on the lock or the ink screen, so that the tag obtains a larger field energy.
At present, the positions of NFC antennas of different mobile phones are different, which makes it difficult to find the position of the antenna in the actual use process to obtain a large field energy to complete the required operation. In addition, the high-frequency signals sent by the NFC antenna are not uniformly distributed in space, and even if the NFC antenna of the mobile phone is opposite to the NFC antenna of the tag and the distance between the NFC antenna of the mobile phone and the NFC antenna of the tag is short, the tag cannot acquire large field energy.
Disclosure of Invention
An object of an embodiment of the present invention is to provide a method, a terminal, a tag, a device, and a storage medium for NFC precise alignment.
The method for NFC accurate alignment provided by the embodiment of the invention can be applied to an NFC terminal, and comprises the following steps: s101, sending an electromagnetic field to an NFC tag and establishing a near field communication connection with the NFC tag; s102, sending a field intensity detection instruction to the NFC label; s103, receiving field intensity information returned by the NFC label based on the field intensity detection instruction, wherein the field intensity information comprises the current magnetic field intensity of an electromagnetic field received by the NFC label from the NFC terminal; and S104, judging whether the current magnetic field strength reaches a threshold value, if so, confirming the accurate alignment of the NFC terminal and the NFC tag, and if not, returning to the step S102 or the step S103.
Optionally, returning to step S102 or step S103 includes: a first action is detected and in response to the first action, return is made to step S102 or step S103.
Optionally, returning to step S102 or step S103 in response to the first action comprises: providing corresponding prompt information in response to the first action; detecting a second action and returning to step S102 or step S103 in response to the second action; wherein the second action is generated based on the hint information.
Optionally, the hint information is generated based on a change in a current magnetic field strength of the electromagnetic field received by the NFC tag when the first action is performed.
Optionally, the prompt message includes an orientation identifier, a number identifier, and/or a color identifier displayed on a user interface of the NFC terminal.
Optionally, after confirming that the NFC terminal and the NFC tag are precisely aligned, the method includes: sending an execution instruction to the NFC tag so that the NFC tag executes corresponding driving operation based on the energy of the received electromagnetic field during accurate alignment; the NFC tag is at least partially used as driving energy for driving corresponding operation based on energy of an electromagnetic field received during accurate alignment.
Optionally, the NFC tag is integrated in an NFC passive electronic lock or an NFC passive electronic ink screen, and the execution instruction includes an unlocking instruction of the NFC passive electronic lock or a refreshing instruction of the NFC passive electronic ink screen.
Optionally, the threshold value is a minimum magnetic field strength corresponding to an electromagnetic field received by the NFC tag from the NFC terminal that is capable of providing sufficient driving energy for performing the corresponding driving operation.
The embodiment of the invention provides an NFC accurate alignment method, which can be applied to an NFC tag, and comprises the following steps: s201, receiving an electromagnetic field sent by an NFC terminal and establishing near field communication connection with the electromagnetic field; s202, receiving a field intensity detection instruction sent by the NFC terminal; s203, acquiring the current magnetic field intensity of the electromagnetic field received from the NFC terminal; s204, field intensity information containing the current magnetic field intensity is sent to the NFC terminal, whether the current magnetic field intensity reaches a threshold value or not is judged through the NFC terminal, and the NFC terminal and the NFC label are accurately aligned when the current magnetic field intensity reaches the threshold value.
Optionally, the NFC tag is adapted to transfer energy of the received electromagnetic field to its overvoltage protection circuit or rectifier circuit; the current magnetic field strength is obtained based on the current of the overvoltage protection circuit or the voltage of the rectifier circuit.
Optionally, the method comprises: receiving an execution instruction sent by an NFC terminal; performing a corresponding driving operation based on the energy of the electromagnetic field received at the precise alignment; wherein the energy based on the electromagnetic field received at the precise alignment is at least partially used as driving energy for driving the corresponding operation.
Optionally, the NFC tag is integrated in the NFC passive electronic lock or the NFC passive electronic ink screen, and the driving operation includes an unlocking operation that drives the NFC passive electronic lock or a refreshing operation that drives the NFC passive electronic ink screen.
The device for NFC precise alignment provided by the embodiment of the present invention includes a memory and a processor, where the memory stores computer instructions that can be executed on the processor, and the processor executes the steps of the method for NFC precise alignment provided by the embodiment of the present invention when executing the computer instructions.
The storage medium stores computer instructions, and when the computer instructions are executed, the steps of the NFC precision alignment method provided by the embodiment of the present invention are executed.
An NFC terminal provided in an embodiment of the present invention includes: a first NFC antenna adapted to transmit an electromagnetic field to an NFC tag; the first communication module is suitable for establishing near field communication connection with the NFC tag, sending a field intensity detection instruction to the NFC tag and receiving field intensity information returned by the NFC tag, wherein the field intensity information comprises the current magnetic field intensity of an electromagnetic field received by the NFC tag from the NFC terminal; the first processing module is suitable for judging whether the current magnetic field strength reaches a threshold value or not and confirming the accurate alignment of the NFC terminal and the NFC tag when the current magnetic field strength reaches the threshold value.
Optionally, the NFC terminal includes an action detection module adapted to detect a first action performed by the NFC terminal; the first communication module is suitable for responding to the first action and sending a field intensity detection instruction to the NFC label and receiving field intensity information returned by the NFC label.
Optionally, the NFC terminal includes a prompt module adapted to provide corresponding prompt information in response to the first action; the action detection module is suitable for detecting a second action executed by the NFC terminal, and the second action is generated based on the prompt message; the first communication module is suitable for responding to the second action and sending a field intensity detection instruction to the NFC label and receiving field intensity information returned by the NFC label.
Optionally, the prompting module is adapted to generate the prompting information based on a change in a present magnetic field strength of the received electromagnetic field when the first action is performed.
Optionally, the first communication module is adapted to send an execution instruction to the NFC tag when it is determined that the NFC terminal and the NFC tag are precisely aligned, so that the NFC tag executes a corresponding driving operation based on energy of the electromagnetic field received during the precise alignment; the NFC tag is at least partially used as driving energy for driving corresponding operation based on energy of the electromagnetic field received during accurate alignment.
An embodiment of the present invention provides an NFC tag including: a second NFC antenna adapted to receive an electromagnetic field transmitted by the NFC terminal; the field intensity detection module is suitable for detecting the current magnetic field intensity of the electromagnetic field; the second communication module is suitable for receiving a field intensity detection instruction sent by the NFC terminal and sending field intensity information containing the current magnetic field intensity to the NFC terminal so as to judge whether the current magnetic field intensity reaches a threshold value or not through the NFC terminal and accurately align the NFC terminal and the NFC label when the current magnetic field intensity reaches the threshold value.
Optionally, the NFC tag comprises an overvoltage protection circuit or a rectifier circuit adapted to receive energy of the electromagnetic field; the field intensity detection module is suitable for collecting the current of the overvoltage protection circuit or the voltage of the rectification circuit and obtaining the current magnetic field intensity based on the current or the voltage.
Optionally, the NFC tag comprises an energy storage module connected to the overvoltage protection circuit or the rectifier circuit, and adapted to receive and store energy from the electromagnetic field transmitted by the overvoltage protection circuit or the rectifier circuit.
Optionally, the second communication module is adapted to receive an execution instruction sent by the NFC terminal; the NFC tag comprises a driving module, a data processing module and a data processing module, wherein the driving module is suitable for executing corresponding driving operation based on the energy of the electromagnetic field received during accurate alignment; the NFC tag is stored in the energy storage module based on the energy of the electromagnetic field received during accurate alignment and is at least partially used as driving energy for driving corresponding operation.
Compared with the prior art, the technical scheme of the embodiment of the invention has the beneficial effect. For example, the technical scheme provided by the embodiment of the invention can realize accurate alignment of the NFC terminal and the NFC tag.
For another example, when the NFC terminal and the NFC tag are precisely aligned, the energy of the electromagnetic field received by the NFC tag from the NFC terminal is large, so that the NFC tag can drive the corresponding passive device to operate by using the large energy, for example, the passive electronic lock can be driven to unlock or the passive electronic ink screen can be driven to refresh the display content.
For another example, the magnetic field intensity of the electromagnetic field received by the NFC tag from the NFC terminal can be calculated based on the current of the overvoltage protection circuit in the NFC tag or the voltage of the rectifier circuit, so that the magnetic field intensity is quantized, and the NFC terminal and the NFC tag can be aligned more accurately based on the quantized magnetic field intensity, so that the NFC tag can receive more or most electromagnetic field energy to drive the passive device to operate.
Drawings
Fig. 1 is a flowchart illustrating a method for NFC precise alignment applicable to an NFC terminal according to an embodiment of the present invention;
fig. 2 is another schematic flowchart of an NFC precision alignment method applicable to an NFC terminal according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for NFC precise alignment applicable to an NFC tag in an embodiment of the present invention;
fig. 4 is a functional block diagram of an NFC terminal in an embodiment of the invention;
FIG. 5 is a functional block diagram of an NFC tag in an embodiment of the present invention;
fig. 6 is a functional block diagram of an NFC terminal interacting with an NFC tag in an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the embodiments of the present invention more comprehensible, specific embodiments accompanied with figures are described in detail below.
Referring to fig. 1 and fig. 2, an embodiment of the present invention provides a method 100 for NFC precise alignment applicable to an NFC terminal, including:
s101, sending an electromagnetic field to an NFC tag and establishing a near field communication connection with the NFC tag;
s102, sending a field intensity detection instruction to the NFC label;
s103, receiving field intensity information returned by the NFC label based on the field intensity detection instruction, wherein the field intensity information comprises the current magnetic field intensity of an electromagnetic field received by the NFC label from the NFC terminal;
s104, judging whether the current magnetic field strength reaches a threshold value, if so, executing a step S105, otherwise, returning to the step S102 or the step S103;
and S105, confirming the accurate alignment of the NFC terminal and the NFC label.
NFC generally has three operating modes, including Reader/writer mode, emulation Card modeEmulationMode) and point-to-point Mode (P2P)mode). In the card reader mode, information is read from and written to the NFC tag through the NFC-enabled terminal. Generally, NFC tags do not require external power. When the NFC terminal reads and writes data to the NFC tag, an electromagnetic field is sent to the NFC tag and power is supplied to the NFC tag through energy of the electromagnetic field, so that near field communication connection between the NFC terminal and the NFC tag is achieved.
In some embodiments, the NFC terminal may be a smart terminal device such as a smart phone, a smart band, and the like, which integrates an NFC card reader mode.
In some embodiments, the NFC tag may be integrated in a passive device, for example, in a passive electronic lockset, or a passive electronic ink screen.
In other embodiments, the NFC tag may also be used as a stand-alone device.
In a specific implementation, the NFC terminal may be close to the NFC tag and emit an electromagnetic field, and when the distance between the NFC terminal and the NFC tag is not greater than the induction distance of NFC, the NFC tag may receive the electromagnetic field emitted by the NFC terminal and establish a near field communication connection with the NFC terminal.
In some embodiments, the NFC terminal may further issue a card seeking instruction, and the NFC tag may receive the card seeking instruction after establishing the near field communication connection with the NFC terminal, and return response information to the NFC terminal to prompt the NFC terminal that it has established the near field communication connection with the NFC tag.
In other embodiments, after the NFC terminal issues the card-seeking instruction, no response information is received within a certain time, which may be caused by the fact that the distance between the NFC terminal and the NFC tag is long and is greater than the sensing distance of NFC. In this case, the NFC terminal may be suitably moved further close to the NFC tag, so that the distance between the NFC terminal and the NFC tag is within the sensing distance range of NFC, so that a near field communication connection may be established between the NFC terminal and the NFC tag.
After establishing near field communication connection with the NFC tag, the NFC terminal can send a field intensity detection instruction to the NFC tag; the NFC tag returns field intensity information to the NFC terminal after receiving the field intensity detection instruction, wherein the field intensity information comprises the current magnetic field intensity of an electromagnetic field received by the NFC tag from the NFC terminal; after receiving the field intensity information, the NFC terminal judges whether the current field intensity reaches a threshold value.
In the embodiment of the present invention, the relative positional relationship between the NFC terminal and the NFC tag may be variable.
In some embodiments, the NFC tag, in particular integrated in a passive device, may be fixed in a certain position unchanged; however, the NFC terminal held by the user may change its position at any time, and thus the relative positional relationship between the NFC terminal and the NFC tag changes.
When the relative position relationship between the NFC terminal and the NFC tag changes, the magnetic field intensity of the electromagnetic field received by the NFC tag from the NFC terminal changes along with the relative position relationship between the NFC terminal and the NFC tag. Therefore, the current magnetic field strength included in the field strength information sent by the NFC tag to the NFC terminal is the magnetic field strength of the electromagnetic field received by the NFC tag based on the current relative position relationship with the NFC terminal, and the magnetic field strength may change with the change of the relative position relationship between the NFC terminal and the NFC tag.
When current magnetic field intensity reaches the threshold value, can confirm the accurate counterpoint of NFC terminal and NFC label. At this time, the energy of the electromagnetic field received by the NFC tag from the NFC terminal is strong.
In some embodiments, when it is determined that the NFC terminal and the NFC tag are accurately aligned, corresponding determination information may be provided through a user interface of the NFC terminal to remind a user holding the NFC terminal, where the NFC terminal and the NFC tag are accurately aligned.
In some embodiments, when the current magnetic field strength does not reach the threshold value, that is, when the NFC terminal and the NFC tag are not accurately aligned, corresponding prompt information may also be provided through the user interface of the NFC terminal to remind a user holding the NFC terminal, where the NFC terminal and the NFC tag are not accurately aligned at this time.
In the embodiment of the present invention, if the current magnetic field strength does not reach the threshold value, the step S102 or the step S103 may be executed again.
In some embodiments, the NFC terminal may continuously send the field strength detection instruction to the NFC tag, and in this case, if the current magnetic field strength does not reach the threshold, the step S103 may be executed again, that is, the field strength information returned by the NFC tag based on the field strength detection instruction is received again. After the NFC terminal receives the field strength information again, S104 is continuously executed, that is, whether the current magnetic field strength reaches the threshold value is determined again. Thus, the steps S103 and S104 are repeatedly cycled until the current magnetic field strength reaches the threshold value, and the NFC terminal and the NFC tag are confirmed to be accurately aligned.
In other embodiments, the NFC terminal may not continuously send the field strength detection instruction to the NFC tag, and the NFC tag may return the field strength information to the NFC terminal when receiving the field strength detection instruction sent by the NFC terminal, and in this case, if the current magnetic field strength does not reach the threshold, the step S102 may be returned to, that is, the NFC terminal sends the field strength detection instruction to the NFC tag again. And the NFC label returns the field intensity information to the NFC terminal when receiving the field intensity detection instruction sent again by the NFC terminal. After the NFC terminal receives the field strength information again (i.e., step S103), S104 is continuously executed, that is, it is determined whether the current magnetic field strength reaches the threshold again. In this way, the steps S102 to S104 are repeatedly repeated until the NFC terminal and the NFC tag are confirmed to be accurately aligned when the current magnetic field strength reaches the threshold value.
In the embodiment of the present invention, when the relative position relationship between the NFC terminal and the NFC tag is not changed, the magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal is not changed, and only when the relative position relationship between the NFC terminal and the NFC tag is changed, the magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal is changed.
In some preferred embodiments, the location of the NFC tag, particularly the NFC tag integrated in the passive electronic lockset or passive electronic ink screen, may be fixed. At this time, whether the relative positional relationship between the NFC terminal and the NFC tag sends a change may be determined by detecting a change in the position of the NFC terminal. Specifically, whether the location of the NFC terminal has changed can be determined by detecting whether the NFC terminal has performed a certain action.
In an embodiment of the present invention, the returning to step S102 or step S103 in step S104 may specifically include:
s106, detecting a first action;
s107, in response to the first action, returns to step S102 or step S103.
In a specific implementation, a sensing device such as a position sensor may be disposed in the NFC terminal, and configured to detect whether a position change occurs in the NFC terminal. When the location of the NFC terminal changes, it inevitably causes a change in location due to certain actions being performed. Therefore, whether the NFC terminal has performed a certain action can be detected by detecting a change in the location of the NFC terminal.
In the embodiment of the present invention, the action is generated when the current magnetic field strength does not reach the threshold value, that is, the NFC terminal and the NFC tag are not precisely aligned. For ease of description, this action may be referred to as a first action.
Specifically, the first action may be an action performed by the NFC terminal by a user holding the NFC terminal when the NFC terminal is not precisely aligned with the NFC tag by operating the NFC terminal to move. For example, the user may operate the NFC terminal to perform an action of moving to the right.
In a specific implementation, the step S102 or the step S103 may be performed by detecting whether the NFC terminal performs the first action, and returning in response to the first action when the first action is detected.
Specifically, when it is detected that the NFC terminal performs the first action, it indicates that the position of the NFC terminal has changed, and the relative position relationship between the NFC terminal and the NFC tag has also changed, and at this time, the magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal has also changed, and it is necessary to obtain the current magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal again. Therefore, it is possible to return to performing step S102 or step 103 in response to the first action.
In a specific implementation, although the relative position relationship between the NFC terminal and the NFC tag changes due to the first action being performed, at this time, the magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal does not necessarily reach the threshold value. In this case, there is still no precise alignment between the NFC terminal and the NFC tag.
In an embodiment of the present invention, the returning to step S102 or step S103 in response to the first action in step S107 may include:
s108, providing corresponding prompt information in response to the first action;
s109, detecting a second action;
s110, in response to the second action, returns to step S102 or step S103.
In a specific implementation, the first action performed by the user operating the NFC terminal to move is usually a continuous action in a short time. For example, when the user operates the NFC terminal to perform an action of moving to the right, the NFC terminal may perform a movement of moving to the right by a distance.
Therefore, during the first action (for example, moving to the right), the position of the NFC terminal may change continuously, and the relative positional relationship between the NFC terminal and the NFC tag may also change. Accordingly, the current magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal also changes continuously.
In a specific implementation, the NFC terminal may provide the corresponding prompt information in response to the first action. Since the current magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal may continuously change during the first action (e.g., moving to the right) performed by the NFC terminal, the prompt may be generated based on the change in the current magnetic field strength of the electromagnetic field received by the NFC tag when the first action is performed.
For example, when the user operates the NFC terminal to perform an action of moving to the right, if the current magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal is gradually increased in the process, the prompt information of continuing to move to the right may be provided, and if the current magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal is gradually decreased in the process, the prompt information of moving to the left (i.e., the direction opposite to the current action) may be provided.
Specifically, the prompt message may include an orientation identifier, a number identifier, and/or a color identifier displayed on the user interface of the NFC terminal. The direction identifier may include an arrow identifier for indicating a specific direction, and the like; the digital identifier can directly display the specific numerical value of the current magnetic field intensity; the color identifier may include a color bar identifier with gradually changing color, for example, a green color bar with gradually changing color from light green to dark green, and when the user operates the NFC terminal to cause the NFC terminal to perform an action of moving to the right, if the current magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal is gradually increased, the color of the green color bar may be gradually darker, and if the current magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal is gradually decreased, the color of the green color bar may be gradually lighter.
In a particular implementation, the second action is generated based on the hint information. Specifically, after the user holding the NFC terminal sees the prompt message displayed on the user interface, the NFC terminal may be operated to move based on the prompt message, so that the user performs the second action.
When the NFC terminal executes the second action based on the prompt information, the location of the NFC terminal may change, and the relative location relationship between the NFC terminal and the NFC tag may also change. Correspondingly, the current magnetic field intensity of the electromagnetic field received by the NFC tag from the NFC terminal also changes, and the current magnetic field intensity approaches to the threshold value, so that the NFC terminal and the NFC tag can be accurately aligned as soon as possible.
In an embodiment of the present invention, after the step S105, namely after the NFC terminal is confirmed to be precisely aligned with the NFC tag, the method may include:
and S111, sending an execution instruction to the NFC tag so that the NFC tag executes corresponding driving operation based on the energy of the received electromagnetic field during accurate alignment.
In a specific implementation, the threshold value is a minimum magnetic field strength corresponding to an electromagnetic field received by the NFC tag from the NFC terminal that is capable of providing sufficient driving energy for performing a corresponding driving operation.
In a specific implementation, the NFC tag may be used at least partially as a driving energy for driving a corresponding operation based on the energy of the electromagnetic field received at the time of the precise alignment.
Specifically, when the NFC tag is integrated in the NFC passive electronic lock or the NFC passive electronic ink screen, the execution instruction includes an unlocking instruction of the NFC passive electronic lock or a refreshing instruction of the NFC passive electronic ink screen. The NFC tag can be used for driving the NFC passive electronic lock to unlock or driving the NFC passive electronic ink screen to refresh display content at least partially as driving energy based on energy of an electromagnetic field received when the NFC tag is accurately aligned.
Referring to fig. 3, a method 200 applicable to NFC precise alignment of an NFC tag according to an embodiment of the present invention includes:
s201, receiving an electromagnetic field sent by an NFC terminal and establishing near field communication connection with the electromagnetic field;
s202, receiving a field intensity detection instruction sent by the NFC terminal;
s203, acquiring the current magnetic field intensity of the electromagnetic field received from the NFC terminal;
s204, field intensity information containing the current magnetic field intensity is sent to the NFC terminal, whether the current magnetic field intensity reaches a threshold value or not is judged through the NFC terminal, and the NFC terminal and the NFC label are accurately aligned when the current magnetic field intensity reaches the threshold value.
In a specific implementation, the NFC terminal may be close to the NFC tag and emit an electromagnetic field, and when the distance between the NFC terminal and the NFC tag is not greater than the induction distance of NFC, the NFC tag may receive the electromagnetic field emitted by the NFC terminal and establish a near field communication connection with the NFC terminal.
After the NFC terminal establishes near field communication connection with the NFC tag, the NFC terminal sends a field intensity detection instruction to the NFC tag; the NFC label acquires the current magnetic field intensity of an electromagnetic field received from the NFC terminal after receiving a field intensity detection instruction, and returns field intensity information including the current magnetic field intensity to the NFC terminal, so that whether the current magnetic field intensity reaches a threshold value or not is judged through the NFC terminal, and the NFC terminal and the NFC label are accurately aligned when the threshold value is reached.
And when the threshold value is not reached, the NFC label can continuously or again receive the field intensity detection instruction sent by the NFC terminal. And after the field intensity detection instruction is continuously or again received, the NFC label can acquire the current magnetic field intensity of the electromagnetic field received from the NFC terminal again and returns the current magnetic field intensity to the NFC terminal until the NFC terminal and the NFC label are accurately aligned.
In an embodiment of the present invention, an NFC tag is provided with an overvoltage protection circuit (which may be a clamp circuit, for example) and a rectification circuit. The NFC tag can transfer the energy of the electromagnetic field it receives from the NFC terminal directly into an overvoltage protection circuit or a rectifier circuit.
In some embodiments, the present magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal may be obtained by detecting a current in the overvoltage protection circuit and based on the current. In particular, the current is an input current in the overvoltage protection circuit.
In other embodiments, the present magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal may be obtained by detecting a voltage in the rectifying circuit and based on the voltage. Specifically, the voltage is an output voltage in a rectifier circuit.
In a specific implementation, the corresponding relationship between the input current in the overvoltage protection circuit or the output voltage in the rectification circuit and the magnetic field strength can be calibrated in advance, and the current magnetic field strength corresponding to the current or the voltage can be converted based on the corresponding relationship and the detected current or voltage.
The calibration of the corresponding relationship between the current in the overvoltage protection circuit or the voltage in the rectification circuit and the magnetic field strength can be realized by adopting conventional technical means in the field, and is not described herein again.
In the embodiment of the present invention, when the NFC terminal confirms that the NFC terminal is accurately aligned with the NFC tag, a corresponding execution instruction may be sent to the NFC tag, so that the NFC tag completes a corresponding execution operation based on the execution instruction. In particular, when the NFC tag is integrated in a passive device (e.g., a passive electronic lock or a passive electronic ink screen), the NFC tag may be caused to perform an operation of driving the passive device.
Specifically, the method 200 applicable to NFC precise alignment of an NFC tag may further include:
s205, receiving an execution instruction sent by the NFC terminal;
and S206, executing corresponding driving operation based on the energy of the electromagnetic field received in the accurate alignment.
In a specific implementation, the NFC tag may be used at least partially as a driving energy for driving a corresponding operation based on the energy of the electromagnetic field received at the time of the precise alignment.
In some embodiments, the NFC tag may be connected with a passive device. For example, the NFC tag may be connected to a passive electronic lockset or a passive electronic ink screen.
In other embodiments, the NFC tag may be integrated into a passive device. For example, the NFC tag may be integrated into an NFC passive electronic lockset or an NFC passive electronic ink screen.
Further, the NFC tag can drive the passive device to operate by using the driving energy obtained by the NFC tag. For example, actuating unlocking of the NFC passive electronic lock, or actuating refreshing of the NFC passive electronic ink screen to display content.
In a specific implementation, the driving energy obtained by the NFC tag may be first converted into electric energy, and the electric energy is used as the power of the passive device to drive the corresponding operation.
The embodiment of the present invention further provides an apparatus for NFC precise alignment, which includes a memory and a processor, where the memory stores computer instructions executable on the processor, and the processor executes the steps of the method applicable to NFC precise alignment of an NFC terminal or an NFC tag according to the embodiment of the present invention when executing the computer instructions.
The embodiment of the present invention further provides a storage medium, on which computer instructions are stored, and when the computer instructions are executed, the steps of the method for NFC precise alignment applicable to an NFC terminal or an NFC tag according to the embodiment of the present invention are executed.
Referring to fig. 4, an embodiment of the present invention provides an NFC terminal 300 including a first NFC antenna 310, a first communication module 320, and a first processing module 330.
In a specific implementation, the first NFC antenna 310 is adapted to send an electromagnetic field to the NFC tag; the first communication module 320 is connected to the first NFC antenna 310 and is adapted to establish a near field communication connection with an NFC tag, send a field strength detection instruction to the NFC tag, and receive field strength information returned by the NFC tag, where the field strength information includes a current magnetic field strength of an electromagnetic field received by the NFC tag from an NFC terminal; the first processing module 330 is connected to the first communication module 320, and is adapted to determine whether the current magnetic field strength reaches a threshold value, and when the current magnetic field strength reaches the threshold value, confirm that the NFC terminal is precisely aligned with the NFC tag.
Further, the NFC terminal 300 further includes an action detection module. The detection module action is suitable for detecting a first action executed by the NFC terminal; the first communication module 320 is connected to the action detection module and adapted to send a field strength detection instruction to the NFC tag and receive field strength information returned by the NFC tag in response to the first action.
In some embodiments, the action detection module may include a location sensor, and the first action performed by the NFC terminal is sensed by the location sensor.
Further, the NFC terminal 300 further includes a prompt module. The prompting module is connected with the action detection module and is suitable for responding to the first action and providing corresponding prompting information; the action detection module is also suitable for detecting a second action executed by the NFC terminal, and the second action is generated based on the prompt message; the first communication module 320 is further adapted to send a field strength detection instruction to the NFC tag and receive field strength information returned by the NFC tag in response to the second action.
In some embodiments, the prompting module is adapted to generate the prompting information based on a change in a current magnetic field strength of the received electromagnetic field when the first action is performed.
Further, the NFC terminal 300 further includes a user interface. The prompt message may include an orientation indicator, a number indicator, and/or a color indicator displayed on the user interface of the NFC terminal.
Further, the first communication module 320 is further adapted to send an execution instruction to the NFC tag when it is determined that the NFC terminal and the NFC tag are precisely aligned, so that the NFC tag executes a corresponding driving operation based on energy of the electromagnetic field received during precise alignment; the NFC tag is at least partially used as driving energy for driving corresponding operation based on energy of the electromagnetic field received during accurate alignment.
Referring to fig. 5, an embodiment of the present invention provides an NFC tag 400 including a second NFC antenna 410, a second communication module 420, and a field strength detection module 430.
In a specific implementation, the second NFC antenna 410 is adapted to receive an electromagnetic field transmitted by the NFC terminal; the field strength detection module 430 is adapted to detect a present magnetic field strength of the received electromagnetic field; the second communication module 420 is connected to the second NFC antenna 410 and the field intensity detection module 430, and is adapted to receive a field intensity detection instruction sent by the NFC terminal and send field intensity information including the current magnetic field intensity to the NFC terminal, so as to determine whether the current magnetic field intensity reaches a threshold value through the NFC terminal, and when the threshold value is reached, the NFC terminal is accurately aligned to the NFC tag.
Referring to fig. 6, the NFC tag 400 further includes an overvoltage protection circuit 440 and a rectification circuit 450.
In a specific implementation, the second NFC antenna 410 may directly feed the energy of the electromagnetic field it receives from the NFC terminal 300 into the overvoltage protection circuit 440 or the rectification circuit 450. In some embodiments, the second NFC antenna 410 may be connected to the overvoltage protection circuit 440 and the rectification circuit 450 in sequence. In other embodiments, the second NFC antenna 410 may also be connected to the rectifying circuit 450 and the overvoltage protection circuit 440 in sequence.
In an embodiment of the present invention, the over-voltage protection circuit 440 is configured to release excess electromagnetic field energy received by the NFC tag 400 to avoid damaging the circuitry of the NFC tag 400. The rectifier circuit 450 is used for rectifying and stabilizing the electromagnetic field energy received by the NFC tag 400.
In an embodiment of the present invention, the field strength detection module 430 may be configured to collect a current of the overvoltage protection circuit 440 or a voltage of the rectification circuit 450, and obtain the current magnetic field strength based on the collected current or voltage.
In a specific implementation, the correspondence between the current in the overvoltage protection circuit 440 or the voltage in the rectification circuit 450 and the magnetic field strength may be calibrated in advance and stored in the NFC tag.
In some preferred embodiments, the current may be an input voltage in the overvoltage protection circuit 440 and the voltage may be an output voltage in the trim circuit 450.
In a specific implementation, the field strength detection module 430 may convert the current magnetic field strength corresponding to the input current or the output voltage based on the corresponding correspondence and the collected input current or output voltage.
For calibrating the corresponding relationship between the current in the overvoltage protection circuit or the voltage in the rectification circuit and the magnetic field intensity, the conventional technical means in the field can be adopted, and the details are not repeated here.
In some embodiments, the NFC tag 400 further comprises a second processing module 460, which is adapted to obtain the current magnetic field strength from the field strength detection module 430, and output the current magnetic field strength formed in the field strength information to the second communication module 420.
The NFC tag 400 further includes a power storage module 470 connected to the overvoltage protection circuit 440 or the rectifying circuit 450. The energy storage module 470 is used for receiving and storing the energy from the electromagnetic field transmitted by the overvoltage protection circuit 440 or the rectifying circuit 450. In particular, the energy storage module 470 may be an energy storage capacitor.
In an embodiment of the present invention, the second communication module 420 is further adapted to receive an execution instruction sent by the NFC terminal 300.
In a specific implementation, NFC tag 400 may further include a driving module 480 connected to power storage module 470. The driving module 480 is configured to perform a corresponding driving operation based on the energy of the electromagnetic field received during the precise alignment.
In a specific implementation, the energy of the NFC tag 400 based on the electromagnetic field received during the precise alignment may be stored in the energy storage module 470 and at least partially used as driving energy for driving the corresponding operation.
In some embodiments, NFC tag 400 may be connected to a passive device. For example, NFC tag 400 may be connected to a passive electronic lockset or passive electronic ink screen.
In other embodiments, NFC tag 400 may be integrated into a passive device. For example, NFC tag 400 may be integrated into an NFC passive electronic lockset or an NFC passive electronic ink screen.
In an implementation, the driving module 480 may drive the passive device to operate by using the driving energy stored in the energy storage module 470. For example, actuating unlocking of the NFC passive electronic lock, or actuating refreshing of the displayed content of the NFC passive electronic ink screen.
In the embodiment of the present invention, the energy of the electromagnetic field received by the NFC tag 400 from the NFC terminal 300 may be used to drive other modules in the NFC tag 400 to operate, in addition to driving the passive device to operate. For example, the second communication module 420, the second processing module 460, etc. may be driven to operate.
Since the voltages required for the other modules in the NFC tag 400 to operate are different, the NFC tag 400 further includes a power management module 490 configured to allocate the corresponding operating voltages to the other modules in the NFC tag 400.
When the NFC tag 400 is integrated or connected to a passive device and is used to perform a driving operation for the passive device, the NFC tag 400 may further include a rights management module 500. The authority management module 500 is adapted to authenticate the identity of the corresponding passive device when the NFC tag 400 receives the execution instruction, so as to determine whether the passive device has the driving authority.
Specifically, upon receiving the execution instruction, the NFC tag 400 may transmit a request authentication instruction to the corresponding passive device to acquire its identity information from the passive device. When the NFC tag 400 receives the identity information of the passive device, the identity of the passive device may be authenticated by the permission management module 500 to determine whether the passive device has a driving permission.
In specific implementation, valid identity information of a passive device having a driving authority may be preset in the NFC tag 400, and when the identity information sent by the passive device is received, the identity information may be compared with the preset valid identity information by the authority management module 500, so as to determine whether the passive device has the driving authority. And when the comparison is consistent, the passive device is confirmed to have the driving authority, and when the comparison is consistent, the passive device is confirmed not to have the driving authority. When it is confirmed that the passive device does not have the driving authority, the NFC tag 400 does not perform the driving operation.
Further, the NFC tag 400 may further include a nonvolatile memory 510 adapted to store ID information of the NFC tag 400, valid identity information of a passive device, a correspondence relationship between an input current in the overvoltage protection circuit 440 or an output voltage in the rectifier circuit 450 and a magnetic field strength, and the like.
While specific embodiments have been described above, these embodiments are not intended to limit the scope of the present disclosure, even where only a single embodiment is described with respect to a particular feature. The characteristic examples provided in the present disclosure are intended to be illustrative, not limiting, unless differently stated. In particular implementations, the features of one or more dependent claims may be combined with those of the independent claims as technically feasible according to the actual requirements, and the features from the respective independent claims may be combined in any appropriate manner and not merely by the specific combinations enumerated in the claims.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (23)

1. An NFC accurate alignment method is applied to an NFC terminal, and is characterized by comprising the following steps:
s101, sending an electromagnetic field to an NFC tag and establishing a near field communication connection with the NFC tag;
s102, sending a field intensity detection instruction to the NFC label;
s103, receiving field intensity information returned by the NFC tag based on the field intensity detection instruction, wherein the field intensity information comprises the current magnetic field intensity of an electromagnetic field received by the NFC tag from the NFC terminal;
and S104, judging whether the current magnetic field strength reaches a threshold value, if so, confirming the accurate alignment of the NFC terminal and the NFC tag, and if not, returning to the step S102 or the step S103.
2. The method according to claim 1, wherein the returning to step S102 or step S103 comprises:
a first action is detected and in response to the first action, a return is made to step S102 or step S103.
3. The method of claim 2, wherein the returning to step S102 or step S103 in response to the first action comprises:
providing corresponding prompt information in response to the first action;
detecting a second action and returning to step S102 or step S103 in response to the second action;
wherein the second action is generated based on the hint information.
4. The method of claim 3, wherein the prompt is generated based on a change in a current magnetic field strength of an electromagnetic field received by the NFC tag when performing the first action.
5. The method as claimed in claim 3, wherein the prompt message comprises an orientation indicator, a number indicator, and/or a color indicator displayed on a user interface of the NFC terminal.
6. The method of claim 1, wherein the confirming that the NFC terminal is precisely aligned with the NFC tag comprises:
sending an execution instruction to the NFC tag so that the NFC tag executes corresponding driving operation based on the energy of the received electromagnetic field during accurate alignment;
wherein the NFC tag is at least partially used as driving energy for driving corresponding operation based on energy of the electromagnetic field received during accurate alignment.
7. The method of claim 6, wherein the NFC tag is integrated in an NFC passive electronic lock or an NFC passive electronic ink screen, and the execution instruction comprises an unlock instruction of the NFC passive electronic lock or a refresh instruction of the NFC passive electronic ink screen.
8. The method of claim 6, wherein the threshold is a minimum magnetic field strength corresponding to an electromagnetic field received by the NFC tag from the NFC terminal capable of providing sufficient driving energy for performing a corresponding driving operation.
9. An NFC accurate alignment method is applied to an NFC tag, and is characterized by comprising the following steps:
s201, receiving an electromagnetic field sent by an NFC terminal and establishing near field communication connection with the electromagnetic field;
s202, receiving a field intensity detection instruction sent by the NFC terminal;
s203, acquiring the current magnetic field intensity of the electromagnetic field received from the NFC terminal;
s204, sending field intensity information containing the current magnetic field intensity to the NFC terminal, judging whether the current magnetic field intensity reaches a threshold value through the NFC terminal, and aligning the NFC terminal and the NFC label accurately when the current magnetic field intensity reaches the threshold value.
10. The method according to claim 9, characterized in that said NFC tag is adapted to deliver the energy of the received electromagnetic field to its overvoltage protection circuit or rectification circuit; the current magnetic field strength is obtained based on the current of the overvoltage protection circuit or the voltage of the rectification circuit.
11. The method of claim 9, comprising:
receiving an execution instruction sent by the NFC terminal;
performing a corresponding driving operation based on the energy of the electromagnetic field received at the precise alignment;
wherein the energy based on the electromagnetic field received at the precise alignment is at least partially used as driving energy for driving the corresponding operation.
12. The method of claim 11, wherein the NFC tag is integrated into an NFC passive electronic lock or an NFC passive electronic ink screen, and wherein the actuation operation comprises an unlocking operation that actuates the NFC passive electronic lock or a refresh operation that actuates the NFC passive electronic ink screen.
13. An apparatus for NFC precise alignment, comprising a memory and a processor, wherein the memory stores computer instructions executable on the processor, and the processor executes the computer instructions to perform the steps of the method according to any one of claims 1 to 12.
14. A storage medium having stored thereon computer instructions, characterized in that the computer instructions are operable to perform the steps of the method of any one of claims 1 to 12.
15. An NFC terminal, comprising:
a first NFC antenna adapted to transmit an electromagnetic field to an NFC tag;
the first communication module is suitable for establishing near field communication connection with the NFC tag, sending a field intensity detection instruction to the NFC tag and receiving field intensity information returned by the NFC tag, wherein the field intensity information comprises the current magnetic field intensity of an electromagnetic field received by the NFC tag from the NFC terminal;
and the first processing module is suitable for judging whether the current magnetic field strength reaches a threshold value or not and confirming that the NFC terminal is accurately aligned with the NFC tag when the current magnetic field strength reaches the threshold value.
16. The NFC terminal according to claim 15, comprising an action detection module adapted to detect a first action performed by the NFC terminal;
the first communication module is suitable for responding to the first action and sending a field intensity detection instruction to the NFC label and receiving field intensity information returned by the NFC label.
17. The NFC terminal according to claim 16, comprising a prompt module adapted to provide a corresponding prompt in response to the first action;
the action detection module is suitable for detecting a second action executed by the NFC terminal, and the second action is generated based on the prompt message;
the first communication module is suitable for responding to the second action and sending a field intensity detection instruction to the NFC label and receiving field intensity information returned by the NFC label.
18. The NFC terminal according to claim 17, wherein the prompting module is adapted to generate the prompting information based on a change in a current magnetic field strength of the received electromagnetic field when the first action is performed.
19. The NFC terminal of claim 15, wherein the first communication module is adapted to send an execution instruction to the NFC tag when it is confirmed that the NFC terminal is precisely aligned with the NFC tag, so that the NFC tag executes a corresponding driving operation based on energy of an electromagnetic field received at the precise alignment; wherein the NFC tag is at least partially used as driving energy for driving corresponding operation based on energy of the electromagnetic field received during accurate alignment.
20. An NFC tag, comprising:
a second NFC antenna adapted to receive an electromagnetic field transmitted by the NFC terminal;
the field intensity detection module is suitable for detecting the current magnetic field intensity of the electromagnetic field;
the second communication module is suitable for receiving a field intensity detection instruction sent by the NFC terminal and sending the field intensity information containing the current magnetic field intensity to the NFC terminal, so that the NFC terminal judges whether the current magnetic field intensity reaches a threshold value or not, and when the current magnetic field intensity reaches the threshold value, the NFC terminal is accurately aligned with the NFC label.
21. The NFC tag of claim 20, comprising an overvoltage protection circuit or a rectifier circuit adapted to receive energy of the electromagnetic field; the field intensity detection module is suitable for collecting the current of the overvoltage protection circuit or the voltage of the rectification circuit and obtaining the current magnetic field intensity based on the current or the voltage.
22. The NFC tag according to claim 21 comprising an energy storage module connected to the overvoltage protection circuit or the rectifier circuit and adapted to receive and store energy from the electromagnetic field delivered by the overvoltage protection circuit or the rectifier circuit.
23. The NFC tag according to claim 22, wherein the second communication module is adapted to receive an execution instruction sent by the NFC terminal;
the device comprises a driving module, a control module and a control module, wherein the driving module is suitable for executing corresponding driving operation based on the energy of the electromagnetic field received in the accurate alignment process; the NFC tag is stored in the energy storage module based on the energy of the electromagnetic field received during accurate alignment and is at least partially used as driving energy for driving corresponding operation.
CN202011339871.8A 2020-11-25 2020-11-25 NFC accurate alignment method, terminal, tag, device and storage medium Withdrawn CN114548129A (en)

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