CN207638657U - A kind of control circuit and smart card for NFC near-field communications - Google Patents
A kind of control circuit and smart card for NFC near-field communications Download PDFInfo
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- CN207638657U CN207638657U CN201721508473.8U CN201721508473U CN207638657U CN 207638657 U CN207638657 U CN 207638657U CN 201721508473 U CN201721508473 U CN 201721508473U CN 207638657 U CN207638657 U CN 207638657U
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Abstract
The utility model discloses a kind of control circuits and smart card for NFC near-field communications, control circuit include at least one antenna, voltage processing module, control module, gating switch module and preset quantity radio-frequency communication module, antenna obtains radio energy from external NFC device and exports alternating current to voltage processing module, and voltage processing module powers the control module that supplies voltage to that AC process is direct current；Control module output switch control signal to gating switch module, gating switch module is switched on or off the connection of corresponding radio-frequency communication module and corresponding antenna according to switch control signal；When radio-frequency communication module is connected with antenna, radio-frequency communication module carries out radio communication by antenna and NFC device.It is electric to solve the problems, such as that the inside of smart card takes, without additional configuration battery, simplifies hardware circuit, smart card also has the function of a variety of radio communications, can switch between a variety of radio communication modes, can be applied to a variety of occasions.
Description
Technical field
The utility model is related to NFC communication technical field more particularly to a kind of control circuit for NFC near-field communications and
Smart card.
Background technology
Near-field communication (Near Field Communication, NFC) is a kind of radiotechnics of short distance high frequency, NFC
Near-field communication technology is from non-contact radio-frequency identification (RFID) and the Technology Integration that interconnects differentiation, on one chip
Combining induction card reader, icah wavw and point-to-point function, can be identified sum number in short distance with compatible equipment
According to exchange.NFC technology is usually applied in smart card.
It generally solves the problems, such as to take electricity by battery powered in existing NFC communication product, causes battery capacity
Loss and waste, make service life of the products shorten.
Utility model content
The utility model embodiment provides a kind of control circuit and smart card for NFC near-field communications, it is intended to solve
It solves the problems, such as to take electricity by battery powered in the prior art, causes the loss and waste of battery capacity, product is made to use year
Limit short problem.
The first aspect of the utility model embodiment provides a kind of control circuit for NFC near-field communications, including extremely
The radio-frequency communication module of a few antenna, voltage processing module, control module, gating switch module and preset quantity.
Antenna is connect with voltage processing module and gating switch module respectively, control module respectively with voltage processing module and
Gating switch module connects, and gating switch module is connect with radio-frequency communication module.
Antenna obtains radio energy from external NFC device by electromagnetic induction coupled modes and exports alternating current to voltage
Processing module, voltage processing module is by the supply voltage that AC process is direct current and exports to control module to give control module
Power supply；Control module output switch control signal to gating switch module, gating switch module is connected according to switch control signal
Or disconnect the connection of corresponding radio-frequency communication module and corresponding antenna；When radio-frequency communication module is connected with antenna, radio frequency
Communication module carries out radio communication by antenna and NFC device.
In one embodiment, the control circuit for being used for NFC near-field communications includes an antenna, and antenna receives NFC device
Radiofrequency signal is simultaneously forwarded to corresponding radio-frequency communication module by the radiofrequency signal of transmission by gating switch module.
In one embodiment, the control circuit for NFC near-field communications includes identical with radio-frequency communication module quantity
Antenna, all antennas are connect with gating switch module, and gating switch module is switched on or off according to switch control signal
The connection of a corresponding radio-frequency communication module and a corresponding antenna.
In one embodiment, the control circuit for NFC near-field communications includes identical with radio-frequency communication module quantity
Antenna, gating switch module include switch unit identical with radio-frequency communication module quantity, and an antenna is correspondingly connected with one and opens
It closes unit and a switch unit is correspondingly connected with a radio-frequency communication module.
In one embodiment, voltage processing module includes sequentially connected rectification unit, voltage regulation unit and voltage conversion
Unit.
Rectification unit receives after alternating current carries out rectification processing and exports direct current, and voltage regulation unit carries out voltage stabilizing to direct current,
Direct current after voltage stabilizing is converted to the supply voltage needed for control module by voltage conversion unit.
In one embodiment, rectification unit includes the first diode, the second diode, third diode and the four or two pole
Pipe.
The cathode of the anode of first diode and the second diode connects the first input end to form rectification unit altogether, and the three or two
The cathode of the anode of pole pipe and the 4th diode connects the second input terminal to form rectification unit, the cathode of the first diode and altogether
The cathode of three diodes connects the first output end to form rectification unit, the anode of the anode of the second diode and the 4th diode altogether
It is connected to ground altogether and forms the second output terminal of rectification unit.
In one embodiment, voltage regulation unit includes Zener diode and filter capacitor.
The cathode of Zener diode and the first end of filter capacitor connect the first end to form voltage regulation unit, Zener diode altogether
Anode and the second end of filter capacitor connect the second end to form voltage regulation unit altogether.
In one embodiment, further include filter module, filter module is connected between antenna and gating switch module, is filtered
Wave module is used to filter out the interference signal in radio communication.
In one embodiment, further include man-machine interactively module, man-machine interactively module is connect with control module, man-machine interactively
Module receives user instructions and is forwarded to control module, so that control module exports corresponding switch control signal；Man-machine interactively
Module also receives the switch state signal of control module feedback and is exported.
The second aspect of the utility model embodiment provides a kind of smart card, including is used for the near fields NFC as described above
The control circuit of communication.
Existing advantageous effect is the utility model embodiment compared with prior art：Antenna passes through electromagnetic induction coupling side
Formula obtains radio energy from external NFC device and exports alternating current to voltage processing module, and voltage processing module is by alternating current
Processing is the supply voltage of direct current and exports to control module to power to control module；Control module output switch control signal
To gating switch module, gating switch module according to switch control signal be switched on or off corresponding radio-frequency communication module with it is right
The connection for the antenna answered；When radio-frequency communication module is connected with antenna, radio-frequency communication module is penetrated by antenna and NFC device
Frequency communicates.Smart card can realize charging when using NFC device Card Reader, electric, the nothing that solves the problems, such as that the inside of smart card takes
Battery need to be additionally configured, reduces the device in product, simplifies hardware circuit, reduces the cost of product.Also achieve one
Sheet smart card has the function of a variety of radio communications, can switch between a variety of radio communication modes, can be applied to a variety of fields
It closes.
Description of the drawings
In order to illustrate more clearly of the technical scheme in the embodiment of the utility model, will make below to required in embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the utility model,
For those of ordinary skill in the art, without having to pay creative labor, it can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the modular structure for the control circuit for NFC near-field communications that one embodiment of the utility model provides
Schematic diagram；
Fig. 2 is the modular structure for the control circuit for NFC near-field communications that one embodiment of the utility model provides
Schematic diagram；
Fig. 3 is the circuit structure for the control circuit for NFC near-field communications that one embodiment of the utility model provides
Schematic diagram.
Specific implementation mode
In order to make those skilled in the art more fully understand this programme, below in conjunction with attached in this programme embodiment
Figure, is explicitly described the technical solution in this programme embodiment, it is clear that described embodiment is this programme part
Embodiment, instead of all the embodiments.Based on the embodiment in this programme, those of ordinary skill in the art are not making
The every other embodiment obtained under the premise of creative work should all belong to the range of this programme protection.
Term " comprising " in the specification and claims of this programme and above-mentioned attached drawing and other any deformations are
Refer to " including but not limited to ", it is intended that cover and non-exclusive include.In addition, term " first " and " second " etc. are for distinguishing
Different objects, not for description particular order.
The realization of the utility model is described in detail below in conjunction with specific attached drawing：
Figures 1 and 2 show that a kind of control circuit for NFC near-field communications that one embodiment of the utility model is provided
100 structure, for convenience of description, illustrate only with the relevant part of the utility model embodiment, details are as follows：
As depicted in figs. 1 and 2, a kind of control circuit for NFC near-field communications that the utility model embodiment is provided
100, including at least one antenna 110, voltage processing module 120, control module 130, gating switch module 140 and preset quantity
Radio-frequency communication module 150.
Antenna 110 is connect with voltage processing module 120 and gating switch module 140 respectively, control module 130 respectively with electricity
Processing module 120 and gating switch module 140 is pressed to connect, gating switch module 140 is connect with radio-frequency communication module 150.
Antenna 110 obtains radio energy from external NFC device 200 by electromagnetic induction coupled modes and exports alternating current
To voltage processing module 120, voltage processing module 120 is by the supply voltage that AC process is direct current and exports to control module
130 to give control module 130 to power；130 output switch control signal of control module is to gating switch module 140, gating switch
Module 140 is switched on or off the company of corresponding radio-frequency communication module 150 and corresponding antenna 110 according to switch control signal
It connects；When radio-frequency communication module 150 and antenna 110 are connected, radio-frequency communication module 150 by antenna 110 and NFC device 200 into
Row radio communication.
In one embodiment, antenna 110 is planar coil antenna.
In the utility model embodiment, the control circuit 100 for NFC near-field communications can be applied to smart card product
In.
The present embodiment from NFC device 200 wirelessly takes electricity antenna 110 in a manner of electromagnetic induction, to control
Module 130 is powered, for example, smart card can realize charging, solve smart card product when using 200 Card Reader of NFC device
Inside take electric problem, without additional configuration battery, reduce the device in product, simplify hardware circuit, reduce product
Cost.
In one embodiment, a radio-frequency communication module 150 is connected according to switch control signal in gating switch module 140
With the connection of an antenna 110, remaining radio-frequency communication module 150 is in antenna 110 connect off-state.
The present embodiment controls gating switch module 140 by control module 130 and switches, to enable antenna 110 to connect
Different radio-frequency communication modules 150, and in synchronization, an antenna 110 can only connect with a radio-frequency communication module 150
Logical, other radio-frequency communication modules 150 do not work.Not only realizing a sheet smart card has the function of that a variety of radio communications (and can
Switch between a variety of radio communication modes), but make a smart card on multiple radio-frequency communication modules 150 between will not phase
Mutually interference, can be applied to a variety of occasions, for example, smart card has the function of mass transit card and bank card functionality etc. simultaneously.
In the utility model embodiment, 130 output switch control signal of control module to gating switch module 140, choosing
Logical switch module 140 is switched on or off corresponding radio-frequency communication module 150 and corresponding antenna 110 according to switch control signal
Connection, to realize different radio communication functions.Gating switch module 140 may include single pole multiple throw, in addition to institute
Other than the radio-frequency communication module 150 needed is connected with corresponding antenna 110, other radio-frequency communication modules 150 are in hanging
State, to electricity be taken to have any impact to radio communication and wirelessly.
In a particular application, control module 130 controls the process that gating switch module 140 acts and specifically includes：
1) when powering on, control module 130 enters working condition, and all radio-frequency communication modules 150 are in antenna 110
Connect the state disconnected.
2) when control module 130 receives user instruction, control module 130 exports corresponding switch according to user instruction
Signal is controlled to gating switch module 140, so that an antenna 110 is connected with specified radio-frequency communication module 150.
As shown in Figure 1, in one embodiment of the utility model, the control circuit 100 for NFC near-field communications includes
One antenna 110, antenna 110 receive the radiofrequency signal that NFC device is sent and are turned radiofrequency signal by gating switch module 140
It is sent to corresponding radio-frequency communication module 150.
In one embodiment of the utility model, gating switch module 140 includes multidiameter option switch.
The present embodiment is suitable under the application scenarios only there are one antenna 110, is opened by the control gating of control module 130
The mode that module 140 switches is closed, respective communication function is realized by a variety of communication modules, can appoint between multichannel communication multiple telecommunication mode
Meaning switching, mutual Communication Jamming and the absorbed problem of energy can be had by also solving between mutiple antennas 110, be avoided the occurrence of
The case where communication contention aware.
In one embodiment, include and 150 quantity of radio-frequency communication module for the control circuit 100 of NFC near-field communications
Identical antenna 110, all antennas 110 are connect with gating switch module 140, and gating switch module 140 is opened according to described
It closes control signal conduction or disconnects the connection of corresponding a radio-frequency communication module 150 and a corresponding antenna 110.
As shown in Fig. 2, in one embodiment of the utility model, the control circuit 100 for NFC near-field communications includes
Antenna 110 identical with 150 quantity of radio-frequency communication module, gating switch module 140 include and 150 quantity phase of radio-frequency communication module
Same switch unit 141, an antenna 110 is correspondingly connected with a switch unit 141 and a switch unit 141 is correspondingly connected with one
A radio-frequency communication module 150.
In the present embodiment, wherein any one antenna 110 is connect with voltage processing module 120, and passes through electromagnetic induction
Coupled modes obtain radio energy from external NFC device 200 and export alternating current to voltage processing module 120, so that voltage
Processing module 120 is powered to control module 130.
In one embodiment, switch unit 141 can be electronic switching tube, for example, triode, metal-oxide-semiconductor etc..
The present embodiment is suitable for the application scenarios with mutiple antennas 110, is led in different by gating switch module 140
Switch between letter module, control process is simple, easily realizes.
Fig. 3 shows the circuit for the control circuit 100 for NFC near-field communications that one embodiment of the utility model is provided
Structure, for convenience of description, illustrate only with the relevant part of the utility model embodiment, details are as follows：
As shown in figure 3, in one embodiment of the utility model, antenna 110 is planar coil antenna T1.
Planar coil antenna T1 obtains AC energy from NFC device 200 (such as card reader) by electromagnetic induction.
As shown in figure 3, in one embodiment of the utility model, voltage processing module 120 includes sequentially connected whole
Flow unit 121, voltage regulation unit 122 and voltage conversion unit 123.
Rectification unit 121 receives after alternating current carries out rectification processing and exports direct current, and voltage regulation unit 122 carries out direct current
Direct current after voltage stabilizing is converted to the supply voltage needed for control module 130 by voltage stabilizing, voltage conversion unit 123.
In the present embodiment, the first end and second end of planar coil antenna T1 respectively with rectification unit 121 first
Input terminal and the second input terminal connect one to one, the first output end and second output terminal of rectification unit 121 respectively with voltage stabilizing
The first end and second end of unit 122 connects one to one, and the first end and second end of voltage regulation unit 122 also converts list with voltage
Member 123 connects.
In the present embodiment, antenna 110 obtains radio by electromagnetic induction coupled modes from external NFC device 200
What can be exported afterwards is alternating current, since alternating current cannot be directly applied in the internal module of smart card, it is therefore desirable to exchange
Electricity is handled.Alternating current is carried out rectification processing by alternating current transmission to rectification unit 121, rectification unit 121 in the present embodiment
After export direct current, direct current using the steady pressure treatment of voltage regulation unit 122 and the voltage conversion of voltage conversion unit 123 at
Switch to stablize after reason and sizeable supply voltage, the supply voltage are used to power to control module 130.
As shown in figure 3, in one embodiment of the utility model, rectification unit 121 includes the first diode D1, second
Diode D2, third diode D3 and the 4th diode D4.
The cathode of the anode of first diode D1 and the second diode D2 connect the first input to form rectification unit 121 altogether
End, the anode of third diode D3 and the cathode of the 4th diode D4 connect the second input terminal to form rectification unit 121 altogether, and first
The cathode of diode D1 connects the first output end to form rectification unit 121, the second diode altogether with the cathode of third diode D3
The anode of the anode of D2 and the 4th diode D4 are connected to ground and form the second output terminal of rectification unit 121 altogether.
In the present embodiment, the alternating current that antenna 110 exports is by the first diode D1, the second diode D2, the three or two pole
The rectifier circuit of pipe D3 and the 4th diode D4 compositions, direct current is converted to by alternating current.
As shown in figure 3, in one embodiment of the utility model, voltage regulation unit 122 includes Zener diode D5 and filter
Wave capacitance C1.
The cathode of Zener diode D5 connects the first end to form voltage regulation unit 122 altogether with the first end of filter capacitor C1, together
The anode of diode D5 of receiving connects the second end to form voltage regulation unit 122 altogether with the second end of filter capacitor C1.
In the present embodiment, rectification unit 121 exports direct current to voltage regulation unit 122, to prevent the overtension of direct current
Device in late-class circuit is damaged, Zener diode D5 is set in voltage regulation unit 122, the voltage of direct current is carried out
Limitation, to protect the device in late-class circuit.Voltage regulation unit 122 is again by the DC power transmission after voltage stabilizing to voltage conversion unit
123 obtain required voltage value output.
In one embodiment, voltage regulation unit 122 includes linear voltage regulator.
In a particular application, linear voltage regulator is LDO (Low Dropout Regulator) low pressure difference linear voltage regulator.
As shown in figure 3, in one embodiment of the utility model, the control circuit 100 for NFC near-field communications is also wrapped
Filter module 160 is included, filter module 160 is connected between antenna 110 and gating switch module 140, and filter module 160 is for filtering
Except the interference signal in radio communication.
As shown in figure 3, filter module 160 includes the second filter capacitor C2.
As shown in figure 3, in one embodiment of the utility model, the control circuit 100 for NFC near-field communications is also wrapped
Man-machine interactively module 170 is included, man-machine interactively module 170 is connect with control module 130, and man-machine interactively module 170 receives user and refers to
Control module 130 is enabled and is forwarded to, so that control module 130 exports corresponding switch control signal；Man-machine interactively module 170 is also
It receives the switch state signal that control module 130 is fed back and is exported.
In one embodiment, man-machine interactively module 170 includes touch display screen.
In one embodiment, man-machine interactively module 170 includes input unit and output display unit.
In a particular application, input unit includes the input equipments such as button, and output display unit includes the displays such as display
Equipment.
The utility model embodiment additionally provides a kind of smart card, including is used for the control of NFC near-field communications as described above
Circuit 100 processed.
In conclusion above example is only to illustrate the technical solution of the utility model, rather than its limitations；Although ginseng
The utility model is described in detail according to previous embodiment, it will be understood by those of ordinary skill in the art that：It is still
Can be with technical scheme described in the above embodiments is modified, or which part technical characteristic is equally replaced
It changes；And these modifications or replacements, various embodiments of the utility model technical solution that it does not separate the essence of the corresponding technical solution
Spirit and scope.
Claims (10)
1. a kind of control circuit for NFC near-field communications, which is characterized in that including at least one antenna, voltage processing module,
The radio-frequency communication module of control module, gating switch module and preset quantity；
The antenna is connect with the voltage processing module and the gating switch module respectively, the control module respectively with institute
It states voltage processing module to connect with the gating switch module, the gating switch module is connect with the radio-frequency communication module；
The antenna obtains radio energy from external NFC device by electromagnetic induction coupled modes and exports alternating current to described
Voltage processing module, the voltage processing module is by the supply voltage that the AC process is direct current and exports to the control
Module is to give the control module to power；The control module output switch control signal is described to the gating switch module
Gating switch module is switched on or off the corresponding radio-frequency communication module and corresponding institute according to the switch control signal
State the connection of antenna；When the radio-frequency communication module is connected with the antenna, the radio-frequency communication module passes through the antenna
Radio communication is carried out with the NFC device.
2. being used for the control circuit of NFC near-field communications as described in claim 1, which is characterized in that the control circuit includes
One antenna, the antenna receive the radiofrequency signal that the NFC device is sent and are penetrated described by the gating switch module
Frequency signal is forwarded to the corresponding radio-frequency communication module.
3. being used for the control circuit of NFC near-field communications as described in claim 1, which is characterized in that the control circuit includes
Antenna identical with the radio-frequency communication module quantity, all antennas are connect with the gating switch module, described
Gating switch module according to the switch control signal be switched on or off a corresponding radio-frequency communication module with it is corresponding
An antenna connection.
4. being used for the control circuit of NFC near-field communications as described in claim 1, which is characterized in that the control circuit includes
Antenna identical with the radio-frequency communication module quantity, the gating switch module include and the radio-frequency communication module quantity phase
Same switch unit, an antenna is correspondingly connected with a switch unit and a switch unit is correspondingly connected with one
A radio-frequency communication module.
5. being used for the control circuit of NFC near-field communications as described in claim 1, which is characterized in that the voltage processing module
Including sequentially connected rectification unit, voltage regulation unit and voltage conversion unit；
The rectification unit receives after the alternating current carries out rectification processing and exports direct current, and the voltage regulation unit is to the direct current
Electricity carries out voltage stabilizing, and the direct current after voltage stabilizing is converted to the electricity of the power supply needed for the control module by the voltage conversion unit
Pressure.
6. being used for the control circuit of NFC near-field communications as claimed in claim 5, which is characterized in that the rectification unit includes
First diode, the second diode, third diode and the 4th diode；
The cathode of the anode of first diode and second diode connects the first input to form the rectification unit altogether
The cathode of end, the anode of the third diode and the 4th diode connects the second input to form the rectification unit altogether
The cathode of end, the cathode of first diode and the third diode connects the first output to form the rectification unit altogether
The anode of end, the anode of second diode and the 4th diode is connected to ground and forms the second of the rectification unit altogether
Output end.
7. being used for the control circuit of NFC near-field communications as claimed in claim 5, which is characterized in that the voltage regulation unit includes
Zener diode and filter capacitor；
The cathode of the Zener diode and the first end of the filter capacitor meet the first end to form the voltage regulation unit, institute altogether
The second end of the anode and the filter capacitor of stating Zener diode connects the second end to form the voltage regulation unit altogether.
8. the control circuit as described in any one of claim 1 to 7 for NFC near-field communications, which is characterized in that further include filter
Wave module, the filter module are connected between the antenna and the gating switch module, and the filter module is for filtering out
Interference signal in the radio communication.
9. the control circuit as described in any one of claim 1 to 7 for NFC near-field communications, which is characterized in that further include people
Work interactive module, the man-machine interactively module are connect with the control module, and the man-machine interactively module receives user instructions simultaneously
It is forwarded to the control module, so that the corresponding switch control signal of control module output；The man-machine interactively mould
Block also receives the switch state signal of the control module feedback and is exported.
10. a kind of smart card, which is characterized in that including as described in any one of claim 1 to 9 for NFC near-field communications
Control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721508473.8U CN207638657U (en) | 2017-11-10 | 2017-11-10 | A kind of control circuit and smart card for NFC near-field communications |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721508473.8U CN207638657U (en) | 2017-11-10 | 2017-11-10 | A kind of control circuit and smart card for NFC near-field communications |
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| Publication Number | Publication Date |
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| CN207638657U true CN207638657U (en) | 2018-07-20 |
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ID=62856398
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| CN201721508473.8U Active CN207638657U (en) | 2017-11-10 | 2017-11-10 | A kind of control circuit and smart card for NFC near-field communications |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107911147A (en) * | 2017-11-10 | 2018-04-13 | 深圳市文鼎创数据科技有限公司 | A kind of control circuit and smart card for NFC near-field communications |
| WO2021135741A1 (en) * | 2020-01-02 | 2021-07-08 | 深圳市文鼎创数据科技有限公司 | Nfc access control circuit and nfc apparatus |
-
2017
- 2017-11-10 CN CN201721508473.8U patent/CN207638657U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107911147A (en) * | 2017-11-10 | 2018-04-13 | 深圳市文鼎创数据科技有限公司 | A kind of control circuit and smart card for NFC near-field communications |
| WO2021135741A1 (en) * | 2020-01-02 | 2021-07-08 | 深圳市文鼎创数据科技有限公司 | Nfc access control circuit and nfc apparatus |
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