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

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

Method, terminal, label, device and storage medium for precise NFC alignment

technical field

The present invention relates to the technical field of near field communication, and in particular, to a method, terminal, label, device and storage medium for precise alignment of NFC.

Background technique

Near Field Communication (NFC) is an emerging technology developed on the basis of non-contact radio frequency identification technology combined with wireless interconnection technology. A very safe and fast way of communication.

In particular, passive tags based on NFC communication not only require no external power supply, but also can collect the energy of the electromagnetic field emitted by the NFC terminal to drive various passive devices. For example, NFC passive electronic locks and NFC passive drive ink screens both rely on collecting the energy of the electromagnetic field emitted by the NFC-enabled smartphone to drive the motor motor or ink screen to complete unlocking or refresh the display content of the ink screen.

However, since a large amount of power is required to drive an electronic lock to unlock or drive an ink screen to refresh the displayed content, the field energy emitted by an NFC mobile phone is limited, and the transmission power of different NFC mobile phones is also different. For this purpose, it is necessary to precisely align the position of the NFC antenna of the mobile phone with the position of the tag antenna on the lock or ink screen, so that the tag can obtain greater field energy.

At present, the positions of the NFC antennas of different mobile phones are different, which makes it difficult to find the position of the antenna in actual use in order to obtain a large field energy to complete the required operation. In addition, the spatial distribution of the high-frequency signals emitted by the NFC antenna is not uniform. Even if the NFC antenna of the mobile phone and the NFC antenna of the tag are positioned directly and are relatively close, the tag may not necessarily obtain greater field energy.

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present invention is to provide a method, terminal, tag, device and storage medium for precise alignment of NFC.

An NFC precise alignment method provided by an embodiment of the present invention can be applied to an NFC terminal. The method includes: S101, sending an electromagnetic field to an NFC tag and establishing a near-field communication connection therewith; S102 sending a field strength detection instruction to the NFC tag S103, receive the field strength information returned by the NFC tag based on the field strength detection instruction, and the field strength information includes the current magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal; S104, determine whether the current magnetic field strength reaches a threshold, and if so, confirm the NFC The terminal and the NFC tag are precisely aligned, if not, return to step S102 or step S103.

Optionally, returning to step S102 or step S103 includes detecting the first action and returning to step S102 or step S103 in response to the first action.

Optionally, returning to step S102 or step S103 in response to the first action includes: providing corresponding prompt information in response to the first action; detecting the 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 prompt information.

Optionally, the prompt information is generated based on a change in the current magnetic field strength of the electromagnetic field received by the NFC tag when the first action is performed.

Optionally, the prompt information includes a direction identification, a digital identification, and/or a color identification displayed on the user interface of the NFC terminal.

Optionally, confirming the precise alignment of the NFC terminal and the NFC tag includes: sending an execution instruction to the NFC tag, so that the NFC tag performs a corresponding driving operation based on the energy of the electromagnetic field received during the precise alignment; wherein, the NFC tag is based on the precise alignment. The energy of the electromagnetic field received during the alignment is at least partially used as driving energy to drive the corresponding operation.

Optionally, the NFC tag is integrated in the NFC passive electronic lock or the NFC passive electronic ink screen, and the execution instruction includes an unlock instruction of the NFC passive electronic lock or a refresh instruction of the NFC passive electronic ink screen.

Optionally, the threshold value is the minimum magnetic field strength corresponding to the electromagnetic field received by the NFC tag from the NFC terminal and capable of providing sufficient driving energy for performing the corresponding driving operation.

An NFC precise alignment method provided by an embodiment of the present invention can be applied to an NFC tag. The method includes: S201, receiving an electromagnetic field sent by an NFC terminal and establishing a near-field communication connection therewith; S202, receiving a field sent by the NFC terminal Strong detection instruction; S203, obtain the current magnetic field strength of the electromagnetic field received from the NFC terminal; S204, send field strength information including the current magnetic field strength to the NFC terminal, so as to judge whether the current magnetic field strength reaches the threshold through the NFC terminal, and when the threshold is reached The NFC terminal and the NFC tag are precisely aligned.

Optionally, the NFC tag is adapted to deliver the 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 includes: receiving an execution instruction sent by the NFC terminal; performing a corresponding driving operation based on the energy of the electromagnetic field received during the precise alignment; wherein, the energy of the electromagnetic field received during the precise alignment is at least partially used as the driving force. Energy is used to drive the corresponding operations.

Optionally, the NFC tag is integrated into the NFC passive electronic lock or the NFC passive electronic ink screen, and the driving operation includes driving the unlocking operation of the NFC passive electronic lock, or driving the refresh operation of the NFC passive electronic ink screen.

An apparatus for precise alignment of NFC provided by an embodiment of the present invention includes a memory and a processor. The memory stores computer instructions that can be run on the processor, and the processor executes the computer instructions provided by the embodiments of the present invention when running the computer instructions. The steps of the above-mentioned method for precise alignment of NFC.

An embodiment of the present invention provides a storage medium on which computer instructions are stored, and when the computer instructions are run, the steps of the above-mentioned method for precise alignment of NFC provided by the embodiment of the present invention are executed.

An NFC terminal provided by an embodiment of the present invention includes: a first NFC antenna, adapted to send an electromagnetic field to an NFC tag; a first communication module, adapted to establish a near-field communication connection with the NFC tag and send a field strength detection instruction to the NFC tag , and receive the field strength information returned by the NFC tag, the field strength information includes the current magnetic field strength of the 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, and confirms the NFC when it is reached. The terminal and the NFC tag are precisely aligned.

Optionally, the NFC terminal includes an action detection module adapted to detect the first action performed by the NFC terminal; the first communication module is adapted to send a field strength detection instruction to the NFC tag in response to the first action and receive the field returned by the NFC tag. strong information.

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 adapted to detect a second action performed by the NFC terminal, and the second action is generated based on the prompt information; the first action is The communication module is 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.

Optionally, the prompt module is adapted to generate prompt information based on a change in the current magnetic field strength of the electromagnetic field received when the first action is performed.

Optionally, the first communication module is adapted to send an execution instruction to the NFC tag when the precise alignment of the NFC terminal and the NFC tag is confirmed, so that the NFC tag performs a corresponding driving operation based on the energy of the electromagnetic field received during the precise alignment; wherein , the energy of the electromagnetic field received by the NFC tag during precise alignment is at least partially used as driving energy for driving corresponding operations.

An NFC tag provided by an embodiment of the present invention includes: a second NFC antenna, suitable for receiving an electromagnetic field sent by an NFC terminal; a field strength detection module, suitable for detecting the current magnetic field strength of the electromagnetic field; and a second communication module, suitable for Receive the field strength detection instruction sent by the NFC terminal, and send the field strength information including the current magnetic field strength to the NFC terminal, so as to determine whether the current magnetic field strength reaches the threshold through the NFC terminal, and when the threshold is reached, the NFC terminal and the NFC tag are precisely aligned.

Optionally, the NFC tag includes an overvoltage protection circuit or a rectifier circuit suitable for receiving the energy of the electromagnetic field; the field strength detection module is adapted to collect the current of the overvoltage protection circuit or the voltage of the rectifier circuit, and obtain the current magnetic field based on the current or voltage. strength.

Optionally, the NFC tag includes an energy storage module connected to the overvoltage protection circuit or the rectifier circuit, and is adapted to receive and store the 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 includes a driving module adapted to perform a corresponding driving operation based on the energy of the electromagnetic field received during precise alignment; wherein the NFC tag is based on precise alignment. The energy of the received electromagnetic field is stored in the energy storage module and is used, at least in part, as driving energy to drive the corresponding operation.

Compared with the prior art, the technical solutions of the embodiments of the present invention have beneficial effects. For example, using the technical solutions provided by the embodiments of the present invention can achieve precise alignment between 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 relatively large, so that the NFC tag can use the relatively large energy to drive the corresponding passive device to work. Drive passive electronic locks to unlock or drive passive electronic ink screens to refresh display content, etc.

For another example, the magnetic field strength 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 strength can be quantified, and based on the quantified magnetic field strength, the The alignment of the NFC terminal and the NFC tag is realized, so that the NFC tag can receive more or most electromagnetic field energy for driving the passive device to work.

Description of drawings

FIG. 1 is a schematic flowchart of a method for NFC precise alignment that can be applied to an NFC terminal in an embodiment of the present invention;

FIG. 2 is another schematic flow chart of the method for NFC precise alignment that can be applied to an NFC terminal in an embodiment of the present invention;

3 is a schematic flowchart of a method for NFC precise alignment of NFC tags in an embodiment of the present invention;

4 is a schematic block diagram of an NFC terminal in an embodiment of the present invention;

5 is a schematic block diagram of an NFC tag in an embodiment of the present invention;

FIG. 6 is a principle block diagram of the interaction between an NFC terminal and an NFC tag in an embodiment of the present invention.

Detailed ways

In order to make the objectives, features and beneficial effects of the embodiments of the present invention more obvious and easy to understand, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 and FIG. 2 , a method 100 for precise NFC alignment of an NFC terminal provided by an embodiment of the present invention includes:

S101, sending an electromagnetic field to an NFC tag and establishing a near-field communication connection therewith;

S102, sending a field strength detection instruction to the NFC tag;

S103, receiving the field strength information returned by the NFC tag based on the field strength detection instruction, where the field strength information includes the current magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal;

S104, determine whether the current magnetic field strength reaches the threshold, if so, execute step S105, if not, return to step S102 or step S103;

S105, confirming that the NFC terminal and the NFC tag are precisely aligned.

NFC usually has three working modes, including card reader mode (Reader/writer mode), emulation card mode (Card Emulation Mode) and peer-to-peer mode (P2P mode). Among them, for the card reader mode, it is essentially to read and write information from the NFC tag through a terminal that supports NFC. Usually, NFC tags do not need external power supply. When the NFC terminal reads and writes data to the NFC tag, it sends an electromagnetic field to the NFC tag and supplies power to the NFC tag through the energy of the electromagnetic field, so as to realize the near field communication connection between the NFC terminal and the NFC tag.

In some embodiments, the NFC terminal may be a smart terminal device such as a smart phone and a smart bracelet integrated with an NFC card reader mode.

In some embodiments, NFC tags may be integrated into passive devices, eg, passive electronic locks, or passive e-ink screens.

In other embodiments, the NFC tag can also be used as a stand-alone device.

In a specific implementation, the NFC terminal can approach the NFC tag and emit an electromagnetic field. When the distance between the NFC terminal and the NFC tag is not greater than the sensing distance of the NFC, the NFC tag can receive the electromagnetic field sent by the NFC terminal and establish a near field with the NFC terminal. communication connection.

In some embodiments, the NFC terminal may also issue a card finding instruction, and the NFC tag may receive the card finding instruction after establishing a near field communication connection with the NFC terminal, and return response information to the NFC terminal to prompt the NFC terminal that it has contacted the NFC terminal. NFC tags establish a near field communication connection.

In other embodiments, after the NFC terminal sends out a card search command, no response information is received within a certain period of time, which may be due to the long distance between the NFC terminal and the NFC tag and greater than the sensing distance of the NFC. of. In this case, the NFC terminal can be appropriately moved closer to the NFC tag, so that the distance between the NFC terminal and the NFC tag is within the sensing distance of the NFC, so that a near field can be established between the NFC terminal and the NFC tag communication connection.

After the NFC terminal establishes a near-field communication connection with the NFC tag, it can send a field strength detection instruction to the NFC tag; after receiving the field strength detection instruction, the NFC tag will return the field strength information to the NFC terminal. The field strength information includes the NFC tag from the NFC tag. The current magnetic field strength of the electromagnetic field received by the terminal; after receiving the field strength information, the NFC terminal determines whether the current magnetic field strength reaches the threshold.

In the embodiment of the present invention, the relative positional relationship between the NFC terminal and the NFC tag can be changed.

In some embodiments, NFC tags, especially NFC tags integrated in passive devices, can be fixed in a certain position; while an NFC terminal held by a user can change its position at any time, and thus cause an NFC terminal The relative positional relationship with the NFC tag changes.

Because, when the relative positional relationship between the NFC terminal and the NFC tag changes, the magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal will change with the relative positional relationship between the two. 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 positional relationship with the NFC terminal. The relative positional relationship between them varies.

When the current magnetic field strength reaches the threshold, it can be confirmed that the NFC terminal and the NFC tag are precisely aligned. 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 confirmed that the NFC terminal and the NFC tag are precisely aligned, corresponding confirmation information can be provided through the user interface of the NFC terminal to remind the user holding the NFC terminal that the NFC terminal and the NFC tag are accurately aligned at this time. Counterpoint.

In some embodiments, when the current magnetic field strength does not reach the threshold, that is, when the NFC terminal and the NFC tag are not accurately aligned, corresponding prompt information can also be provided through the user interface of the NFC terminal to remind the user holding the NFC terminal. , at this time, the NFC terminal and the NFC tag are not precisely aligned.

In the embodiment of the present invention, if the current magnetic field strength does not reach the threshold value, it is possible to return to step S102 or step S103.

In some embodiments, the NFC terminal can continue to send the field strength detection instruction to the NFC tag. In this case, if the current magnetic field strength does not reach the threshold, it can return to step S103, that is, receive the NFC tag again based on the field strength detection instruction. Field strength information. After the NFC terminal receives the field strength information again, it continues to execute S104, that is, it is judged again whether the current magnetic field strength reaches the threshold value. In this way, steps S103 and S104 are repeated repeatedly until the current magnetic field strength reaches the threshold, and it is confirmed that the NFC terminal and the NFC tag are precisely aligned.

In other embodiments, the NFC terminal will not continuously send the field strength detection command to the NFC tag, and the NFC tag will only return the field strength information to the NFC terminal when it receives the field strength detection command sent by the NFC terminal. , if the current magnetic field strength does not reach the threshold, the process may return to step S102, that is, the NFC terminal sends a field strength detection instruction to the NFC tag again. The NFC tag returns the field strength information to the NFC terminal when it receives the field strength detection instruction sent again by the NFC terminal. After the NFC terminal receives the field strength information again (ie, step S103 ), it continues to execute S104 , that is, it is judged again whether the current magnetic field strength reaches the threshold value. In this way, steps S102 to S104 are repeated repeatedly until the current magnetic field strength reaches the threshold, and it is confirmed that the NFC terminal and the NFC tag are precisely aligned.

In the embodiment of the present invention, when the relative positional relationship between the NFC terminal and the NFC tag is unchanged, the magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal is unchanged, and only the relative positional relationship between the NFC terminal and the NFC tag is the same. The magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal changes only when the change occurs.

In some preferred embodiments, the position of the NFC tag, especially the NFC tag integrated in a passive electronic lock or passive electronic ink screen, may be fixed. At this time, it can be determined whether the relative positional relationship between the NFC terminal and the NFC tag changes by detecting the position change of the NFC terminal. Specifically, it can be determined whether the position of the NFC terminal has changed by detecting whether the NFC terminal performs a certain action.

In the embodiment of the present invention, the returning to step S102 or step S103 in step S104 may specifically include:

S106, detecting the first action;

S107, returning to step S102 or step S103 in response to the first action.

In a specific implementation, a sensing device such as a position sensor may be provided in the NFC terminal to detect whether the position of the NFC terminal changes. When the location of the NFC terminal changes, the location must change due to certain actions being performed. Therefore, it can be detected whether the NFC terminal performs a certain action by detecting the position change 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, that is, when the NFC terminal and the NFC tag are not accurately aligned. For convenience of description, this action may be referred to as a first action.

Specifically, the first action may be an action performed by the user holding the NFC terminal by operating the NFC terminal to move when the NFC terminal and the NFC tag are not precisely aligned. For example, the user may operate the NFC terminal to perform a rightward movement.

In a specific implementation, it is possible to detect whether the NFC terminal performs the first action, and when the first action is detected, return to step S102 or step 103 in response to the first action.

Specifically, when it is detected that the NFC terminal performs the first action, it means that the position of the NFC terminal has changed, and the relative positional relationship between the NFC terminal and the NFC tag has also changed. The magnetic field strength of the received electromagnetic field also changes, and it is necessary to re-acquire the current magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal. Therefore, the execution of step S102 or step 103 may be returned to in response to the first action.

In a specific implementation, although the relative positional relationship between the NFC terminal and the NFC tag changes due to the execution of the first action, at this time, the magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal does not necessarily reach a threshold. In this case, there is still no precise alignment between the NFC terminal and the NFC tag.

In this embodiment of the present invention, 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, detect the second action;

S110, returning to step S102 or step S103 in response to the second action.

In a specific implementation, the first action performed by the user by operating the NFC terminal to move is usually a short-term continuous action. For example, when the user operates the NFC terminal to make it move to the right, the NFC terminal will move to the right for a certain distance.

Therefore, during the process of performing the first action (for example, moving to the right), the position of the NFC terminal will change continuously, and the relative positional relationship between the NFC terminal and the NFC tag will also change continuously. 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 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 will change continuously during the process of the NFC terminal performing the first action (for example, moving to the right), the prompt information can be based on the NFC when the first action is performed. A change in the current magnetic field strength of the electromagnetic field received by the tag results.

For example, when the user operates the NFC terminal to make it move to the right, if the current magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal gradually increases during this process, a prompt message for continuing to move to the right can be provided. , if the current magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal gradually decreases during this process, prompt information for moving to the left (ie, in the opposite direction to the current action) can be provided.

Specifically, the prompt information may include a direction identification, a digital identification, and/or a color identification, etc. displayed on the user interface of the NFC terminal. Wherein, the direction identification may include an arrow identification for indicating a specific direction, etc.; the digital identification may directly display the specific value of the current magnetic field strength; When the user operates the NFC terminal to move to the right, if the current magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal gradually increases, the color of the green ribbon can gradually become darker. The current magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal gradually decreases, and the color of the green ribbon can gradually become lighter.

In a specific implementation, the second action is generated based on the prompt information. Specifically, when the user holding the NFC terminal sees the prompt information displayed on the user interface, he can operate the NFC terminal to move based on the prompt information to make it perform the second action.

When the NFC terminal performs the second action based on the prompt information, the position of the NFC terminal will change, and the relative positional relationship between the NFC terminal and the NFC tag will also change. Correspondingly, the current magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal is also changing, and the current magnetic field strength will approach the threshold, so that the NFC terminal and the NFC tag can be accurately aligned as soon as possible.

In the embodiment of the present invention, after step S105, that is, after confirming the precise alignment of the NFC terminal and the NFC tag, the following steps may be included:

S111 , sending an execution instruction to the NFC tag, so that the NFC tag performs a corresponding driving operation based on the energy of the electromagnetic field received during precise alignment.

In a specific implementation, the threshold value is the minimum magnetic field strength corresponding to the electromagnetic field received by the NFC tag from the NFC terminal and capable of providing sufficient driving energy for performing the corresponding driving operation.

In a specific implementation, the energy of the electromagnetic field received by the NFC tag based on the precise alignment can be at least partially used as driving energy for driving corresponding operations.

Specifically, when the NFC tag is integrated into the NFC passive electronic lock or the NFC passive electronic ink screen, the execution instruction includes an unlock instruction of the NFC passive electronic lock or a refresh instruction of the NFC passive electronic ink screen. The energy of the electromagnetic field received by the NFC tag based on precise alignment can be at least partially used as driving energy to drive the NFC passive electronic lock to unlock, or to drive the NFC passive electronic ink screen to refresh the display content.

Referring to FIG. 3 , a method 200 for NFC precise alignment of NFC tags provided by an embodiment of the present invention includes:

S201, receiving the electromagnetic field sent by the NFC terminal and establishing a near-field communication connection with it;

S202, receiving the field strength detection instruction sent by the NFC terminal;

S203, obtaining the current magnetic field intensity of the electromagnetic field received from the NFC terminal;

S204: Send field strength information including the current magnetic field strength to the NFC terminal, so as to determine whether the current magnetic field strength reaches a threshold through the NFC terminal, and when the threshold is reached, the NFC terminal and the NFC tag are precisely aligned.

In a specific implementation, the NFC terminal can approach the NFC tag and emit an electromagnetic field. When the distance between the NFC terminal and the NFC tag is not greater than the sensing distance of the NFC, the NFC tag can receive the electromagnetic field sent by the NFC terminal and establish a near field with the NFC terminal. communication connection.

After the NFC terminal establishes a near-field communication connection with the NFC tag, the NFC terminal sends a field strength detection instruction to the NFC tag; after receiving the field strength detection instruction, the NFC tag obtains the current magnetic field strength of the electromagnetic field received from the NFC terminal, and sends the The field strength information including the current magnetic field strength is returned to the NFC terminal, so that the NFC terminal can judge whether the current magnetic field strength reaches the threshold value, and when the threshold value is reached, the NFC terminal and the NFC tag are precisely aligned.

When the threshold is not reached, the NFC tag will continue or receive the field strength detection command sent by the NFC terminal again. When the field strength detection command is received continuously or again, the NFC tag will obtain the current magnetic field strength of the electromagnetic field received from the NFC terminal again, and return it to the NFC terminal until the NFC terminal and the NFC tag are precisely aligned.

In the embodiment of the present invention, the NFC tag is provided with an overvoltage protection circuit (for example, a clamping circuit) and a rectification circuit. The NFC tag can directly transmit the energy of the electromagnetic field it receives from the NFC terminal to the overvoltage protection circuit or the rectification circuit.

In some embodiments, the current in the overvoltage protection circuit can be detected, and the current magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal can be obtained based on the current. Specifically, the current is the input current in the overvoltage protection circuit.

In other embodiments, the current magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal can be obtained by detecting the voltage in the rectifier circuit and based on the voltage. Specifically, the voltage is the output voltage in the rectifier circuit.

In a specific implementation, the input current in the overvoltage protection circuit or the corresponding relationship between the output voltage in the rectifier circuit and the magnetic field strength can be pre-calibrated, and based on the corresponding corresponding relationship and the detected current or voltage, the current or voltage can be converted to the corresponding relationship with the current or voltage. The corresponding current magnetic field strength.

The calibration of the corresponding relationship between the current in the overvoltage protection circuit or the voltage in the rectifier circuit and the magnetic field strength can be achieved by using conventional technical means in the art, and details are not described here.

In the embodiment of the present invention, when the NFC terminal confirms that it is precisely aligned with the NFC tag, it can send a corresponding execution instruction to the NFC tag, so that the NFC tag completes the corresponding execution operation based on the execution instruction. In particular, when the NFC tag is integrated in a passive device (eg, a passive electronic lock or a passive e-ink screen), the NFC tag can be made to perform the operation of driving the passive device.

Specifically, the method 200 for NFC precise alignment that can be applied to an NFC tag may further include:

S205, receiving the execution instruction sent by the NFC terminal;

S206, a corresponding driving operation is performed based on the energy of the electromagnetic field received during the precise alignment.

In a specific implementation, the energy of the electromagnetic field received by the NFC tag based on the precise alignment can be at least partially used as driving energy for driving corresponding operations.

In some embodiments, the NFC tag can be connected to a passive device. For example, NFC tags can be connected to passive electronic locks or passive e-ink screens.

In other embodiments, the NFC tag may be integrated into a passive device. For example, NFC tags can be integrated into NFC passive electronic locks or NFC passive electronic ink screens.

Further, the NFC tag can use the driving energy obtained by the NFC tag to drive the passive device to work. For example, driving the unlocking of NFC passive electronic locks, or driving the refresh display content of NFC passive electronic ink screens.

In a specific implementation, the driving energy obtained by the NFC tag can be converted into electrical energy first, and the electrical energy is used as the power of the passive device to drive the corresponding operation.

An embodiment of the present invention also provides an NFC precise alignment device, which includes a memory and a processor, wherein the memory stores computer instructions that can be run on the processor, and the processor executes the computer instructions provided by the embodiments of the present invention when running the computer instructions. The above steps can be applied to the NFC accurate alignment method of an NFC terminal or an NFC tag.

Embodiments of the present invention further provide a storage medium on which computer instructions are stored, and when the computer instructions run, the steps of the above-mentioned NFC accurate alignment method applicable to NFC terminals or NFC tags provided by the embodiments of the present invention are executed.

4 , an NFC terminal 300 provided by an embodiment of the present invention includes 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 the NFC tag, and to send field strength detection to the NFC tag instruction, and receiving the field strength information returned by the NFC tag, the field strength information includes the current magnetic field strength of the electromagnetic field received by the NFC tag from the NFC terminal; the first processing module 330 is connected to the first communication module 320, and is suitable for judging the current magnetic field strength Whether the threshold is reached, and when it is reached, confirm that the NFC terminal and the NFC tag are accurately aligned.

Further, the NFC terminal 300 further includes a motion detection module. The action of the detection module is adapted to detect the first action performed by the NFC terminal; the first communication module 320 is connected to the action detection module, and is adapted to send a field strength detection instruction to the NFC tag and receive the field strength returned by the NFC tag in response to the first action information.

In some embodiments, the motion detection module may include a position sensor, and the first motion performed by the NFC terminal is sensed by the position sensor.

Further, the NFC terminal 300 further includes a prompting module. The prompt module is connected to the action detection module, and is adapted to provide corresponding prompt information in response to the first action; the motion detection module is further adapted to detect the second action performed by the NFC terminal, and the second action is generated based on the prompt information; the first communication The 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 prompt module is adapted to generate prompt information based on a change in the current magnetic field strength of the electromagnetic field received when the first action is performed.

Further, the NFC terminal 300 also includes a user interface. The prompt information may include a direction identification, a digital identification, and/or a color identification, etc. displayed on the user interface of the NFC terminal.

Further, the first communication module 320 is also adapted to send an execution instruction to the NFC tag when the precise alignment of the NFC terminal and the NFC tag is confirmed, so that the NFC tag performs a corresponding driving operation based on the energy of the electromagnetic field received during the precise alignment; Wherein, the energy of the electromagnetic field received by the NFC tag based on the precise alignment is at least partially used as driving energy for driving corresponding operations.

5 , an NFC tag 400 provided by an embodiment of the present invention includes 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 suitable for receiving the electromagnetic field sent by the NFC terminal; the field strength detection module 430 is suitable for detecting the current magnetic field strength of the received electromagnetic field; the second communication module 420 is respectively connected with the second NFC antenna 410, the field strength The strong detection module 430 is connected, and is suitable for receiving the field strength detection instruction sent by the NFC terminal, and sending the field strength information including the current magnetic field strength to the NFC terminal, so as to judge whether the current magnetic field strength reaches the threshold through the NFC terminal, and when the threshold is reached, the NFC The terminal and the NFC tag are precisely aligned.

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 can directly transmit the energy received by the second NFC antenna 410 from the electromagnetic field of the NFC terminal 300 to 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 rectification circuit 450 and the overvoltage protection circuit 440 in sequence.

In the embodiment of the present invention, the overvoltage protection circuit 440 is used to release the excess electromagnetic field energy received by the NFC tag 400 to avoid damage to the circuit of the NFC tag 400 . The rectification circuit 450 is used to rectify and stabilize the electromagnetic field energy received by the NFC tag 400 .

In the embodiment of the present invention, the field strength detection module 430 may be used to collect the current of the overvoltage protection circuit 440 or the voltage of the rectifier circuit 450, and obtain the current magnetic field strength based on the collected current or voltage.

In a specific implementation, the current in the overvoltage protection circuit 440 or the corresponding relationship between the voltage in the rectifier circuit 450 and the magnetic field strength can be pre-calibrated and pre-stored in the NFC tag.

In some preferred specific examples, the current may be an input circuit in the overvoltage protection circuit 440 , and the voltage may be an output voltage in the sorting 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 output voltage based on the corresponding correspondence and the collected input current or output voltage.

The calibration of the current in the overvoltage protection circuit or the corresponding relationship between the voltage in the rectifier circuit and the magnetic field strength can be achieved by using conventional technical means in the field, and details are not described herein again.

In some embodiments, the NFC tag 400 further includes a second processing module 460, which is adapted to obtain the current magnetic field strength from the field strength detection module 430, and form the current magnetic field strength in the field strength information and output it to the second communication module 420 .

The NFC tag 400 also includes an energy storage module 470 connected to the overvoltage protection circuit 440 or the rectifier circuit 450 . The energy storage module 470 is used to receive and store the energy from the electromagnetic field delivered by the overvoltage protection circuit 440 or the rectifier circuit 450 . Specifically, the energy storage module 470 may be an energy storage capacitor.

In the 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, the NFC tag 400 may further include a driving module 480 connected with the energy 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 precise alignment.

In a specific implementation, the energy of the electromagnetic field received by the NFC tag 400 based on the precise alignment can be stored in the energy storage module 470 and at least partially used as driving energy to drive corresponding operations.

In some embodiments, the NFC tag 400 can be connected to a passive device. For example, the NFC tag 400 can be connected with a passive electronic lock or a passive electronic ink screen.

In other embodiments, the NFC tag 400 may be integrated into a passive device. For example, the NFC tag 400 may be integrated into an NFC passive electronic lock or an NFC passive electronic ink screen.

In a specific implementation, the driving module 480 can utilize the driving energy stored in the energy storage module 470 to drive the passive device to work. For example, driving the unlocking of an NFC passive electronic lock, or driving the refreshed display content of an 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 can be used to drive other modules in the NFC tag 400 to work in addition to driving passive devices to work. For example, the second communication module 420, the second processing module 460, etc. can be driven to work.

Since other modules in the NFC tag 400 require different voltages for operation, the NFC tag 400 further includes a power management module 490 for assigning corresponding operating voltages to other modules in the NFC tag 400 .

When the NFC tag 400 is integrated with or connected to a passive device and 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 confirm whether the passive device has the driving authority.

Specifically, when receiving the execution instruction, the NFC tag 400 may send an authentication request instruction to the corresponding passive device, so as to obtain its identity information from the passive device. When the NFC tag 400 receives the identity information of the passive device, its identity can be authenticated by the authority management module 500 to confirm whether the passive device has the driving authority.

In a specific implementation, the NFC tag 400 can preset the valid identity information of the passive device with driving authority, and when receiving the identity information sent by the passive device, the identity information can be preset with the identity information through the rights management module 500 The valid identity information of the device is compared to determine whether the passive device has the driving authority. When the comparison is consistent, it is confirmed that the passive device has the driving authority, and when the comparison is consistent, it is confirmed that the passive device does not 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 non-volatile memory 510, which is suitable for storing the ID information of the NFC tag 400, the valid identity information of the passive device, and the input current in the overvoltage protection circuit 440 or in the rectifier circuit 450. The corresponding relationship between the output voltage and the magnetic field strength, etc.

Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the present disclosure, even if only a single embodiment is described with respect to specific features. The examples of features provided in this disclosure are intended to be illustrative, not restrictive, unless stated otherwise. In the specific implementation, the technical features of one or more dependent claims and the technical features of the independent claims can be combined according to actual needs and technically feasible, and can be used in any appropriate way instead of only Features from the respective independent claims are combined by means of the specific combinations recited in the claims.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be based on the scope defined by the 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.

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