CN109886057A - A kind of NFC sensing device and system - Google Patents
A kind of NFC sensing device and system Download PDFInfo
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- CN109886057A CN109886057A CN201910333997.5A CN201910333997A CN109886057A CN 109886057 A CN109886057 A CN 109886057A CN 201910333997 A CN201910333997 A CN 201910333997A CN 109886057 A CN109886057 A CN 109886057A
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Abstract
The invention discloses a kind of NFC sensing device and systems, including multiple NFC antennas, multiple radio-frequency switch modules, controller and module for reading and writing, controller is controlled each radio-frequency switch module by the way of repeating query and sequentially turned on, so that module for reading and writing is successively connect with each NFC antenna, module for reading and writing with NFC antenna when connecting, card seeking radiofrequency signal can be launched outward by the NFC antenna, when there are NFC labels close to the NFC antenna, NFC antenna can return to the Tag Radio Frequency signal including NFC tag information, and then module for reading and writing determines the information of the NFC label according to the Tag Radio Frequency signal.Due to including multiple NFC antennas in NFC sensing device, so that any position for the induction region that NFC label is constituted in multiple NFC antennas can be sensed, increase induction region, breach the limitation to the abutment location of NFC label, the probability that NFC label pastes wrong position is smaller, improves user experience.
Description
Technical field
The present invention relates to NFC technique fields, more particularly to a kind of NFC sensing device and system.
Background technique
NFC (Near Field Communication, i.e. near field communication (NFC)) is that a kind of offer is light, pacifies
Entirely, the wireless connection technology rapidly communicated has the characteristics that distance is close, bandwidth is high, low energy consumption, in gate inhibition, public transport, mobile phone branch
It pays in the fields of grade and plays huge effect.NFC sensing device based on NFC technique includes NFC days for incuding NFC label
Line, NFC antenna constitute NFC induction region.In the prior art, the NFC induction region of NFC sensing device is smaller, to NFC label
Abutment location limited, NFC label paste wrong position probability it is larger, be easy to cause need repeatedly adjustment NFC label feelings
The generation of condition, affects user experience.
Summary of the invention
The object of the present invention is to provide a kind of NFC sensing device and systems, increase induction region, breach and mark to NFC
The limitation of the abutment location of label, the probability that NFC label pastes wrong position is smaller, improves user experience.
In order to solve the above technical problems, the present invention provides a kind of NFC sensing devices, comprising:
Multiple NFC antennas；
With multiple NFC antennas multiple radio-frequency switch modules correspondingly, one end of each radio-frequency switch module with
Module for reading and writing connection, correspondingly NFC antenna connects the other end；
The controller being connect respectively with the control terminal of multiple radio-frequency switch modules, for being controlled by the way of repeating query
Each radio-frequency switch module sequentially turns on；
The module for reading and writing for controlling current NFC antenna transmitting card seeking radiofrequency signal connected to it, and is marked in NFC
The Tag Radio Frequency returned when label are close to the current NFC antenna connected to it according to the current NFC antenna connected to it
Signal determines the information of the NFC label.
Preferably, the module for reading and writing is also connect with the controller；
The module for reading and writing is also used in the Tag Radio Frequency signal for receiving the current NFC antenna return connected to it
When determine antenna channels where the NFC antenna that is currently connected with it, and the information of the antenna channels is sent to the control
Device processed；
The controller is also used to control the radio frequency in the antenna channels when receiving the information of the antenna channels
The turn-on time of switch module extends preset time.
Preferably, the current antenna channels where NFC antenna connected to it of the determination, comprising:
Currently connected with it according to pin and default pin channel the corresponding relationship determination for receiving the Tag Radio Frequency signal
Antenna channels where the NFC antenna connect.
Preferably, the module for reading and writing is also connect with the controller；
The module for reading and writing is also used in the Tag Radio Frequency signal for receiving the current NFC antenna return connected to it
When send triggering information to the controller；
The controller is also used to determine the radio-frequency switch module of current control conducting when receiving the triggering information,
And the turn-on time for controlling the radio-frequency switch module of the determination extends preset time.
Preferably, the NFC antenna is PCB antenna.
Preferably, the shape of the NFC antenna is identical as the shape of table top for the NFC antenna to be arranged.
Preferably, the module for reading and writing is connect by spi bus with the controller.
Preferably, the radio-frequency switch module includes single-pole double-throw switch (SPDT) and single channel phase inverter；
The pin of the controller respectively with the first DC voltage control end of the single-pole double-throw switch (SPDT) and the single-pass
The output end of road phase inverter connects, the output end of the single channel phase inverter and the second DC voltage of the single-pole double-throw switch (SPDT)
Control terminal connection；
First non-moving end of the single-pole double-throw switch (SPDT) with and its accordingly NFC antenna is connect, the single-pole double-throw switch (SPDT)
The second non-moving end it is hanging, the moved end of the single-pole double-throw switch (SPDT) is connect with the module for reading and writing.
Preferably, multiple radio-frequency switch modules include multiple single-pole double-throw switch (SPDT)s and multichannel phase inverter, Duo Gedan
The port number of double-pole double throw switch and multichannel phase inverter corresponds；
Multiple output pins of the controller respectively correspondingly with the first direct current of multiple single-pole double-throw switch (SPDT)s
The connection of multiple input terminals of control terminal and multichannel phase inverter is pressed, multiple output ends difference one of the multichannel phase inverter is a pair of
Answer with respectively accordingly the second DC voltage control end of single-pole double-throw switch (SPDT) is connect；
First non-moving end of each single-pole double-throw switch (SPDT) with and its accordingly NFC antenna is connect, each single-pole double-throw switch (SPDT)
The second non-moving end it is hanging, the moved end of the single-pole double-throw switch (SPDT) is connect with the module for reading and writing.
In order to solve the above technical problems, the present invention also provides a kind of NFC induction systems, including NFC as described above
Sensing device further includes processor, for carrying out respective handling according to the information of the NFC label.
The present invention provides a kind of NFC sensing device, including multiple NFC antennas, multiple radio-frequency switch modules, controller and
Module for reading and writing, controller are controlled each radio-frequency switch module by the way of repeating query and sequentially turned on so that module for reading and writing successively with
Each NFC antenna connection, module for reading and writing can launch outward card seeking radio frequency letter when connecting with NFC antenna by the NFC antenna
Number, when there are NFC labels close to the NFC antenna, NFC antenna can return to the Tag Radio Frequency signal including NFC tag information, into
And module for reading and writing determines the information of the NFC label according to the Tag Radio Frequency signal.Due to including multiple NFC in NFC sensing device
Antenna increases induction so that any position for the induction region that NFC label is constituted in multiple NFC antennas can be sensed
Region breaches the limitation to the abutment location of NFC label, and the probability that NFC label pastes wrong position is smaller, improves user's body
It tests.
The present invention also provides a kind of NFC induction systems, have beneficial effect identical with above-mentioned NFC sensing device.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to institute in the prior art and embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of NFC sensing device provided by the invention；
Fig. 2 is the structural schematic diagram of another kind NFC sensing device provided by the invention；
Fig. 3 is the schematic layout pattern of multiple NFC antennas in a kind of NFC sensing device provided by the invention.
Specific embodiment
Core of the invention is to provide a kind of NFC sensing device and system, increases induction region, breaches and marks to NFC
The limitation of the abutment location of label, the probability that NFC label pastes wrong position is smaller, improves user experience.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Fig. 1 is please referred to, Fig. 1 is a kind of structural schematic diagram of NFC sensing device provided by the invention, which includes:
Multiple NFC antennas 1；
With multiple NFC antennas 1 multiple radio-frequency switch modules 2 correspondingly, one end of each radio-frequency switch module 2 and reading
Writing module 4 connects, and correspondingly NFC antenna 1 connects the other end；
The controller 3 being connect respectively with the control terminal of multiple radio-frequency switch modules 2, it is each for being controlled by the way of repeating query
A radio-frequency switch module 2 sequentially turns on；
Module for reading and writing 4 emits card seeking radiofrequency signal for controlling current NFC antenna 1 connected to it, and in NFC label
It is determined when close to current NFC antenna 1 connected to it according to the Tag Radio Frequency signal that current NFC antenna 1 connected to it returns
The information of NFC label.
Specifically, it is contemplated that NFC induction region in the prior art is smaller, to NFC label (NFC tag) close to position
Be equipped with limitation, in the application, NFC sensing device other than including module for reading and writing 4, further include controller 3, multiple NFC antennas 1 and
With multiple NFC antennas 1 multiple radio-frequency switch modules 2 correspondingly.Specifically, radio-frequency switch module 2 is set to module for reading and writing 4
And between corresponding NFC antenna 1, controller 3 is controlled each RF switch by the way of repeating query and sequentially turned on, to make
Module for reading and writing 4 is obtained to be sequentially connected with each NFC antenna 1, when module for reading and writing 4 is connect with a NFC antenna 1,4 meeting of module for reading and writing
Card seeking instruction is issued, namely controls its accordingly transmitting of NFC antenna 1 card seeking radiofrequency signal, passes through high frequency in NFC antenna 1 at this time
Alternating current, coupling generates high frequency magnetic field around the NFC antenna 1, if in the predetermined period of the radio-frequency switch module 2 conducting
Inside there is NFC label close to the NFC antenna 1, then NFC label can enter the magnetic field, have alternate magnetic force line in NFC label
Aerial coil, when generating sufficiently large electric current in the aerial coil of NFC label, NFC antenna 1 just can read NFC information,
Tag Radio Frequency signal and to module for reading and writing 4 is generated, module for reading and writing 4 determines the information of NFC label according to Tag Radio Frequency signal.
It should be noted that the repeating query conducting in the application refers to that multiple radio-frequency switch modules 2 sequentially turn on, and same
The conducting of only one radio-frequency switch module 2 of moment, by taking radio-frequency switch module 2 specially A, B, C as an example, then controller 3 first controls A
Conducting, control B, C shutdown after predetermined period, then control B conducting, and A, C shutdown after predetermined period, then control C and lead
Logical, A, B shutdown after predetermined period, then control A conducting, and control B, C shutdown so recycles.In practical applications, in advance
If the length in period should at least meet the constraint condition that module for reading and writing 4 can read the information of NFC label, such as read-write mould
Block 4 receive the Tag Radio Frequency signal that current NFC antenna 1 connected to it returns and the information for determining NFC label when it is a length of
T, then predetermined period can be set at least 2T, and the application does not limit the setting of predetermined period particularly, according to reality
Situation is determined.In addition it is also necessary to explanation, the duration in a repeating query total period is very short, almost ms rank, therefore, in reality
In the application of border, it is possible to understand that the NFC coil of Cheng Suoyou is launching outward card seeking radiofrequency signal simultaneously.
In addition, in the application, controller 3 can with but be not only limited to STM32 series monolithic, STM32 series monolithic tool
Have the advantages that real-time is good, low in energy consumption；Module for reading and writing 4 can with but be not only limited to NXP CV520 non-contact IC card read-write chip,
NXP CV520 non-contact IC card read-write chip has the advantages that low in energy consumption, signal transmission rate is fast.
Due to the NFC antenna 1 in the application be it is multiple, to NFC antenna 1 be laid out when, in the premise for meeting distance of reaction
Under, product form size can be based on by experimental verification, propose optimum combination disposing way.Specifically, due to NFC antenna 1
The magnetic field induction region of generation is typically larger than the area of NFC antenna 1 itself, therefore, in order to most on the basis of guaranteeing induction
It possibly reduces 1 quantity of NFC antenna, reduce cost, may exist a certain distance between two NFC antennas 1 of arbitrary neighborhood, but
The distance cannot be too big, and the region formed using each NFC antenna 1 does not have any blind area as constraint condition to be configured.
It should also be noted that, the signal of NFC label includes the ID of NFC label, in practical applications, module for reading and writing 4 exists
After obtaining the ID of NFC label, the ID of NFC label can be sent to other processors, so that other processors are marked according to the NFC
The ID of label carries out corresponding operating, such as when the NFC label is specifically used as bus card or bank card, processor can be according to this
The ID of NFC label withholds to the NFC label；When the NFC label is specially access card, processor may determine that the NFC
The ID of label whether default quasi- into list, if it is, control gate opens the door.Certainly, the signal of NFC label can also wrap
Other NFC tag informations are included, the application do not limit particularly herein, determines according to the actual situation.
To sum up: NFC sensing device provided by the invention, including multiple NFC antennas 1, multiple radio-frequency switch modules 2, control
Device 3 and module for reading and writing 4, controller 3 are controlled each radio-frequency switch module 2 by the way of repeating query and sequentially turned on, so that read-write mould
Block 4 is successively connect with each NFC antenna 1, and module for reading and writing 4, can be by the NFC antenna 1 to outgoing when connecting with NFC antenna 1
Card seeking radiofrequency signal is penetrated, when there are NFC labels close to the NFC antenna 1, NFC antenna 1 can be returned including NFC tag information
Tag Radio Frequency signal, and then module for reading and writing 4 determines the information of the NFC label according to the Tag Radio Frequency signal.It is filled since NFC incudes
It include multiple NFC antennas 1 in setting, so that any position for the induction region that NFC label is constituted in multiple NFC antennas 1 can be by
Sense, increase induction region, breach the limitation to the abutment location of NFC label, NFC label paste the probability of wrong position compared with
It is small, improve user experience.
Referring to figure 2., Fig. 2 is the structural schematic diagram of another kind NFC sensing device provided by the invention, in above-described embodiment
On the basis of:
As a kind of preferred embodiment, module for reading and writing 4 is also connect with controller 3；
Module for reading and writing 4 is also used to determine when receiving the Tag Radio Frequency signal that current NFC antenna 1 connected to it returns
Antenna channels where the NFC antenna 1 be currently connected with it, and the information of antenna channels is sent to controller 3；
Controller 3 is also used to control the radio-frequency switch module 2 in antenna channels in the information for receiving antenna channels
Turn-on time extends preset time.
Specifically, above-described embodiment is mentioned, when the conducting duration of the control radio-frequency switch module 2 of controller 3 is arranged, it is desirable that
The conducting duration is at least greater than module for reading and writing 4 and receives Tag Radio Frequency signal that current NFC antenna 1 connected to it returns and true
Determine the duration of the information of NFC label.On this basis, applicant is in view of in some cases, NFC label is connected currently
Radio-frequency switch module 2 when will turn off just close to the radio-frequency switch module 2 that is currently connected accordingly NFC antenna 1, then this kind
In the case of may result in module for reading and writing 4 and cannot get the information of NFC label in time and (may can just be obtained in next round robin cycle
Get) the case where generation.
In order to solve this problem, in the present embodiment, controller 3 is receiving what current NFC antenna 1 connected to it returned
When Tag Radio Frequency signal, the antenna channels where the NFC antenna 1 be currently connected with it are also determined, and by the letter of the antenna channels
Breath is sent to controller 3, and controller 3 controls the radio-frequency switch module 2 in antenna channels after receiving the information of antenna channels
Turn-on time to extend the turn-on time of preset time namely the radio-frequency switch module 2 be predetermined period+preset time, with true
Protect and just can determine that the information of NFC label in the round robin cycle module for reading and writing 4, so so as to the subsequent information according to NFC label into
The operation of row correspondingly, further improves the real-time and sensitivity of NFC sensing device.
In addition, controller 3 control antenna channels in radio-frequency switch module 2 turn-on time extend preset time after,
It is further continued for controlling the conducting of subsequent radio-frequency switch module 2 according to round-robin order.
In practical applications, preset time can be set to module for reading and writing 4 and receives current NFC antenna connected to it
The duration of the information of the 1 Tag Radio Frequency signal returned and determining NFC label, certainly, specific number of the application for preset time
Value do not limit particularly, determines according to the actual situation.
As a kind of preferred embodiment, the antenna channels where current NFC antenna 1 connected to it are determined, comprising:
It is determined according to the pin and default pin channel corresponding relationship for receiving Tag Radio Frequency signal current connected to it
Antenna channels where NFC antenna 1.
Specifically, the different pins of module for reading and writing 4 are connected to different radio-frequency switch modules 2, in practical applications, can be with
Corresponding relationship between the default antenna channels for establishing 2 place of each pin and each radio-frequency switch module.Module for reading and writing 4 is connecing
The pin for being currently received Tag Radio Frequency signal can be determined after receiving Tag Radio Frequency signal, then according to the mark being currently received
The pin and default pin channel corresponding relationship for signing radiofrequency signal determine that the antenna channels be currently connected, this kind of method of determination are simple
Reliably, development difficulty is reduced.
As a kind of preferred embodiment, module for reading and writing 4 is also connect with controller 3；
Module for reading and writing 4 is also used to the transmission when receiving the Tag Radio Frequency signal that current NFC antenna 1 connected to it returns
Information is triggered to controller 3；
Controller 3 is also used to determine the radio-frequency switch module 2 of current control conducting when receiving triggering information, and controls
The turn-on time of determining radio-frequency switch module 2 extends preset time.
Specifically, module for reading and writing 4 is vertical when receiving the Tag Radio Frequency signal that current NFC antenna 1 connected to it returns
Triggering information (such as can be as short as possible for high level triggering or low level triggering, time) is sent to controller 3, control
Device 3 is after receiving triggering information, and (controller 3 is controlling the determining radio-frequency switch module 2 for being currently controlling conducting at this time
The radio-frequency switch module 2 currently connecting with module for reading and writing 4 is connected), and the turn-on time for controlling determining radio-frequency switch module 2 prolongs
Long preset time.As it can be seen that this kind of method of determination is equally fairly simple.
As a kind of preferred embodiment, NFC antenna 1 is PCB antenna.
Specifically, NFC antenna 1 can be PCB antenna, and PCB antenna has the advantages that reliable communications, cheap, certainly,
Here NFC antenna 1 can also be other kinds of NFC antenna 1, be able to achieve the purpose of the application.
As a kind of preferred embodiment, the shape phase of the shape of NFC antenna 1 and the table top for NFC antenna 1 to be arranged
Together.
Specifically, the median plane in the magnetic field induction region that the stronger magnetic line of force that applicant generates in view of NFC antenna 1 is constituted
(coil where plane) it is related with the shape of NFC antenna 1 (be similar in fact, such as NFC antenna 1 is circle, then magnetic of its generation
The median plane of induction region is generally circular in shape distribution) and the magnetic field induction region of the generation of NFC antenna 1 be typically larger than NFC antenna 1
Area itself, therefore, in order to increase the utilization rate of NFC antenna 1 as much as possible, the shape of NFC antenna 1 with for being arranged NFC days
The shape of the table top of line 1 is identical.
For example, table top is circle, then NFC antenna 1 is also circle.Referring to figure 3., Fig. 3 is a kind of NFC provided by the invention
The schematic layout pattern of multiple NFC antennas in sensing device.In view of distance of reaction can achieve 2-5cm, it is being based on diameter
On the round table surface of 40cm, the PCB antenna of 8 to 9 diameters about 9.5cm can be put according to experimental verification, PCB antenna is basis
The NFC antenna 1 of the best performance for 2 to the 3 circle cablings that PCB dielectric constant is debugged out, experiment effect have reached usually single NFC days
14 times or more of 1 induction region area of line.
As a kind of preferred embodiment, NFC antenna 1 includes 2 circles or 3 circles or 4 circle cablings.
Specifically, it has been found that under normal conditions, when NFC antenna 1 is not higher than 4 circle, with the increase of circle number, magnetic
Field intensity increases, and when being higher than 4 circle, magnetic field strength is basically unchanged, this is based on, under the premise of guaranteeing magnetic field strength, in order to drop
Low cost, the circle number of NFC antenna 1 are 2-4 circle.
As a kind of preferred embodiment, module for reading and writing 4 is connect by spi bus with controller 3.
Specifically, spi bus has the advantages that transmission rate is fast, the application it is specific for module for reading and writing 4 how and control
The connection of device 3 does not limit particularly, determines according to the actual situation.
As a kind of preferred embodiment, radio-frequency switch module 2 includes single-pole double-throw switch (SPDT) and single channel phase inverter；
The pin of controller 3 is defeated with the first DC voltage control end of single-pole double-throw switch (SPDT) and single channel phase inverter respectively
Outlet connection, the output end of single channel phase inverter and the second DC voltage control end of single-pole double-throw switch (SPDT) connect；
First non-moving end of single-pole double-throw switch (SPDT) with and its accordingly NFC antenna 1 is connect, the second of single-pole double-throw switch (SPDT) is not
Moved end is hanging, and the moved end of single-pole double-throw switch (SPDT) is connect with module for reading and writing 4.
Specifically, according to the working principle of RF switch and the control principle of single-pole double-throw switch (SPDT), it is desirable that single-pole double throw is opened
The signal at the first DC voltage control end and the second DC voltage control end closed is opposite signal and is that frequency is very high
TTL signal, therefore, in the present embodiment, radio-frequency switch module 2 includes single-pole double-throw switch (SPDT) and single channel phase inverter, specifically, control
On the one hand the TTL signal that device 3 processed exports is directly transferred to the first DC voltage control end of single-pole double-throw switch (SPDT), on the other hand,
It is transmitted to the output end of single channel phase inverter, is exported again after single channel inverter to the second direct current of single-pole double-throw switch (SPDT)
Voltage controling end, single-pole double-throw switch (SPDT) is after the TTL signal for receiving controller 3 and the output of single channel phase inverter, moved end high frequency
Ground switches between NFC antenna 1 hanging, since the frequency of TTL signal is very high, almost it is considered that module for reading and writing 4
It is connected between NFC antenna 1, namely can consider current antenna channel conductive at this time.
When the radio-frequency switch module 2 that controller 3 stops control current antenna channel is connected and controls next antenna channels
In radio-frequency switch module 2 be connected when, the radio-frequency switch module 2 that can export fixed level signal to current antenna channel makes this
Free end (current antenna channel turns off at this time) is got in the moved end of radio-frequency switch module 2, and it is logical to next antenna to export TTL signal
Radio-frequency switch module 2 in road and its accordingly single channel phase inverter, at this time next antenna conducting.
As it can be seen that the structure of radio-frequency switch module 2 provided by the present application is simple, reduce NFC sensing device volume and at
This.
As a kind of preferred embodiment, multiple radio-frequency switch modules 2 include that multiple single-pole double-throw switch (SPDT)s and multichannel are anti-
The port number of phase device, multiple single-pole double-throw switch (SPDT)s and multichannel phase inverter corresponds；
Multiple output pins of controller 3 are voltage-controlled with the first direct current of multiple single-pole double-throw switch (SPDT)s correspondingly respectively
The connection of multiple input terminals of end processed and multichannel phase inverter, multiple output ends of multichannel phase inverter are respectively correspondingly and respectively
It is connected from the second DC voltage control end of accordingly single-pole double-throw switch (SPDT)；
First non-moving end of each single-pole double-throw switch (SPDT) with and its accordingly NFC antenna 1 is connect, each single-pole double-throw switch (SPDT)
The second non-moving end it is hanging, the moved end of single-pole double-throw switch (SPDT) is connect with module for reading and writing 4.
Specifically, the radio frequency in the working principle and above-described embodiment of multiple radio-frequency switch modules 2 provided in this embodiment
The working principle of switch module 2 is identical, and distinctive points are the equal of above-mentioned multiple lists in multichannel phase inverter in this present embodiment
Integrating for channel phase inverter, further simplifies the structure of radio-frequency switch module 2, further reduces the body of NFC sensing device
Long-pending and cost.
In practical applications, multichannel phase inverter here can with but be not only limited to hexagonal phase inverter (model can be for 4HC04
The Hex Inverter of series), then each hexagonal phase inverter can control six single-pole double-throw switch (SPDT)s.Single-pole double-throw switch (SPDT) can be with
But not only it is limited to Skyworks AS179-92LF RF Switch.
It further includes processor that the present invention also provides a kind of NFC induction systems including such as above-mentioned NFC sensing device, is used
According to the information of NFC label progress respective handling.
As a kind of preferred embodiment, NFC label is bus card or bank card.
Specifically, the signal of NFC label includes the ID of NFC label, and in practical applications, module for reading and writing 4 is obtaining NFC mark
After the ID of label, the ID of NFC label can be sent to processor, so that processor is accordingly grasped according to the ID of the NFC label
Make, such as when the NFC label is specifically used as bus card or bank card, processor can be according to the ID of the NFC label to this
NFC label is withholdd；When the NFC label is specially access card, whether processor may determine that the ID of the NFC label pre-
If quasi- into list, if it is, control gate opens the door.Certainly, the signal of NFC label can also include that other NFC labels are believed
Breath, the application do not limit particularly herein, determines according to the actual situation.
Above-described embodiment is please referred to for the introduction of NFC induction system provided by the invention, details are not described herein by the application.
It should be noted that in the present specification, relational terms such as first and second and the like are used merely to one
A entity or operation with another entity or operate distinguish, without necessarily requiring or implying these entities or operation it
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to
Cover non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or setting
Standby intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in the process, method, article or apparatus that includes the element.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of NFC sensing device characterized by comprising
Multiple NFC antennas；
With multiple NFC antennas multiple radio-frequency switch modules correspondingly, one end of each radio-frequency switch module and read-write
Module connection, correspondingly NFC antenna connects the other end；
The controller being connect respectively with the control terminal of multiple radio-frequency switch modules, it is each for being controlled by the way of repeating query
The radio-frequency switch module sequentially turns on；
The module for reading and writing for controlling current NFC antenna transmitting card seeking radiofrequency signal connected to it, and is leaned in NFC label
The Tag Radio Frequency signal returned when the nearly current NFC antenna connected to it according to the current NFC antenna connected to it
Determine the information of the NFC label.
2. NFC sensing device as described in claim 1, which is characterized in that the module for reading and writing is also connect with the controller；
The module for reading and writing is also used to true when receiving the Tag Radio Frequency signal that the current NFC antenna connected to it returns
Antenna channels where the NFC antenna be connected before settled with it, and the information of the antenna channels is sent to the controller；
The controller is also used to control the RF switch in the antenna channels when receiving the information of the antenna channels
The turn-on time of module extends preset time.
3. NFC sensing device as claimed in claim 2, which is characterized in that the current NFC antenna institute connected to it of the determination
Antenna channels, comprising:
It is determined according to the pin and default pin channel corresponding relationship for receiving the Tag Radio Frequency signal current connected to it
Antenna channels where NFC antenna.
4. NFC sensing device as described in claim 1, which is characterized in that the module for reading and writing is also connect with the controller；
The module for reading and writing is also used to the hair when receiving the Tag Radio Frequency signal that the current NFC antenna connected to it returns
Send triggering information to the controller；
The controller is also used to determine the radio-frequency switch module of current control conducting when receiving the triggering information, and controls
The turn-on time for making the radio-frequency switch module of the determination extends preset time.
5. NFC sensing device as described in claim 1, which is characterized in that the NFC antenna is PCB antenna.
6. NFC sensing device as described in claim 1, which is characterized in that the shape of the NFC antenna with it is described for being arranged
The shape of the table top of NFC antenna is identical.
7. the NFC sensing device as described in claim 2 or 4, which is characterized in that the module for reading and writing by spi bus with
The controller connection.
8. such as NFC sensing device as claimed in any one of claims 1 to 6, which is characterized in that the radio-frequency switch module includes single
Double-pole double throw switch and single channel phase inverter；
The pin of the controller is anti-with the first DC voltage control end of the single-pole double-throw switch (SPDT) and the single channel respectively
The output end of phase device connects, the output end of the single channel phase inverter and the second DC voltage control of the single-pole double-throw switch (SPDT)
End connection；
First non-moving end of the single-pole double-throw switch (SPDT) with and its accordingly NFC antenna is connect, the of the single-pole double-throw switch (SPDT)
Two non-moving ends are hanging, and the moved end of the single-pole double-throw switch (SPDT) is connect with the module for reading and writing.
9. such as NFC sensing device as claimed in any one of claims 1 to 6, which is characterized in that multiple radio-frequency switch module packets
Include multiple single-pole double-throw switch (SPDT)s and multichannel phase inverter, one a pair of port number of multiple single-pole double-throw switch (SPDT)s and multichannel phase inverter
It answers；
Multiple output pins of the controller are voltage-controlled with the first direct current of multiple single-pole double-throw switch (SPDT)s correspondingly respectively
The connection of multiple input terminals of end processed and multichannel phase inverter, multiple output ends difference of the multichannel phase inverter is correspondingly
With respectively accordingly the second DC voltage control end of single-pole double-throw switch (SPDT) is connect；
First non-moving end of each single-pole double-throw switch (SPDT) with and its accordingly NFC antenna is connect, the of each single-pole double-throw switch (SPDT)
Two non-moving ends are hanging, and the moved end of the single-pole double-throw switch (SPDT) is connect with the module for reading and writing.
10. a kind of NFC induction system, which is characterized in that including NFC sensing device as described in any one of claim 1 to 9,
It further include NFC label and processor, the processor is used to carry out respective handling according to the information of the NFC label.
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| CN201910333997.5A CN109886057A (en) | 2019-04-24 | 2019-04-24 | A kind of NFC sensing device and system |
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| CN201910333997.5A CN109886057A (en) | 2019-04-24 | 2019-04-24 | A kind of NFC sensing device and system |
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| CN109886057A true CN109886057A (en) | 2019-06-14 |
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