CN106909865B - Near-field communication front end hardware circuit, terminal, reader, system and method - Google Patents
Near-field communication front end hardware circuit, terminal, reader, system and method Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10297—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves arrangements for handling protocols designed for non-contact record carriers such as RFIDs NFCs, e.g. ISO/IEC 14443 and 18092
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
- G06K7/10326—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers the antenna being of the very-near field type, e.g. capacitive
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
- G06K7/10336—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers the antenna being of the near field type, inductive coil
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/77—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for interrogation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The present invention is suitable for field of communication technology, and providing a kind of near-field communication front end hardware circuit, terminal, reader, system and method, the near-field communication front end hardware circuit includes: near-field communication aerial, detection unit and communication interface pin units；The near-field communication aerial includes near field coil and matching capacitance, and the frequency of the near field coil is matched with the carrier frequency of selection；The detection unit obtains former modulated signal, the detection unit is connect with the near field coil for filtering out the carrier wave in received modulated signal；The communication interface pin units, for exporting the former modulated signal to micro-control unit, the communication interface pin units are connected between the detection unit and the micro-control unit.By foregoing circuit, power consumption can be greatly reduced.
Description
Technical field
The invention belongs to field of communication technology more particularly to a kind of near-field communication front end hardware circuit, terminal, reader,
System and method.
Background technique
Near-field communication technology is by non-contact radio-frequency identification (Radio Frequency Identification, RFID)
And interconnection technology integration is evolved, and combines induction type reader, icah wavw and point-to-point on a single chip
Function can be identified and exchanged data in short distance with compatible equipment.This technology is widely used at present, as bank is double
Interface card, novel visual bank card etc..
Most variations are carried out using near-field communication (Near Field Communication, NFC) chip at present
Communication, higher cost, controls chip and external reader A interaction is complicated, and power consumption is higher.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of near-field communication front end hardware circuits, terminal, reader, system
And method, when solving to communicate using NFC chip in the prior art, higher cost, and interaction is complicated, power consumption is higher to ask
Topic.
The embodiment of the present invention in a first aspect, a kind of near-field communication front end hardware circuit is provided, before the near-field communication
End hardware circuit include:
Near-field communication aerial, detection unit and communication interface pin units；
The near-field communication aerial includes near field coil and matching capacitance, the frequency of the near field coil and the carrier wave of selection
Frequency matching；
The detection unit obtains former modulated signal, the detection list for filtering out the carrier wave in received modulated signal
It is first to be connect with the near field coil；
The communication interface pin units, for exporting the former modulated signal to micro-control unit, the communication is connect
Mouth pin units are connected between the detection unit and the micro-control unit.
With reference to first aspect, in the first possible implementation of first aspect, the near-field communication front end hardware circuit
Further include:
Signal after matching for the former modulated signal to be made decisions matching, and is passed through institute by rear end matching unit
It states communication interface pin units to export to the micro-control unit, the rear end matching unit is connected to the detection unit and institute
It states between communication interface pin units.
The possible implementation of with reference to first aspect the first, it is described in second of possible implementation of first aspect
Rear end matching unit includes:
The rear end matching unit is to compare judgement unit or AD sampling unit.
With reference to first aspect or second of the first possible implementation of first aspect or first aspect can be able to achieve
Mode, in the third possible implementation of first aspect, the near-field communication front end hardware circuit further includes that load modulation is single
Member；
The load modulation unit carries out load modulation for the load variation by controlling the near field coil and sends
Modulated signal, the load modulation unit are connect with the detection unit.
The third possible implementation with reference to first aspect, it is described in the 4th kind of possible implementation of first aspect
Loading modulation unit includes:
On-off circuit module and load control module；
The first end of the load control module is connect with the detection unit, the second end of the load control module with
The current input terminal of the on-off circuit module connects, the current output terminal ground connection of the on-off circuit module, the switch electricity
First control terminal of road module, the second control terminal pass through the defeated of the communication interface pin units and the micro-control unit respectively
Enter output interface, send signal end connection.
The second aspect of the embodiment of the present invention provides a kind of near-field communication terminal, the front end of the near-field communication terminal
Hardware circuit includes second of possibility reality of the first possible implementation of the first aspect, first aspect, first aspect
Existing mode, the third possible implementation of first aspect, first aspect the 4th kind of possible implementation any near field
Communication front-end hardware circuit.
The third aspect of the embodiment of the present invention, provides a kind of reader, and the front end hardware circuit of the reader includes
The possible implementation of the first of the first aspect, first aspect, second of first aspect may implementation any
Kind near-field communication front end hardware circuit.
The fourth aspect of the embodiment of the present invention provides a kind of near field communication system, the near field communication system
System includes the near-field communication terminal of second aspect and the reader of the third aspect.
5th aspect of the embodiment of the present invention, provides a kind of near field channel radio based on near-field communication front end hardware circuit
Letter method, comprising:
The modulated signal that reader is sent is received by near-field communication aerial, the near-field communication aerial includes near field coil
And matching capacitance；
The carrier wave that the modulated signal is filtered out by detection unit obtains former modulated signal；
The former modulated signal is exported by communication interface pin units to micro-control unit.
It is described to pass through the former modulated signal in the first possible implementation of the 5th aspect in conjunction with the 5th aspect
Communication interface pin is exported to micro-control unit, comprising:
The former modulated signal is exported to rear end matching unit and is matched；
Signal after rear end matching unit matching is exported by the communication interface pin units to the micro-control
Unit processed.
The former modulated signal is led to described in second of possible implementation of the 5th aspect in conjunction with the 5th aspect
Communication interface pin units are crossed to export to micro-control unit, comprising:
The former modulated signal is responded in the micro-control unit, after generating response signal, according to the response
Signal control load modulation unit carries out load tune by the load variation that the load modulation unit controls the near field coil
System；
Modulated response signal is sent to the reader.
In conjunction with the 5th aspect, in the third possible implementation of the 5th aspect, the load modulation unit includes switch
Circuit module, in the modulated signal for receiving reader transmission by near-field communication aerial, comprising:
Control that the on-off circuit module is in an off state, so that the electric current by the near-field communication aerial is less.
In conjunction with the 5th aspect the first possible implementation, the rear end matching unit be compare judgement unit, at this point,
Described export the former modulated signal to rear end matching unit matches, comprising:
The former modulated signal is exported to the relatively judgement unit, if the amplitude of the original modulated signal is more than default
Amplitude threshold, then the relatively judgement unit exports high level, otherwise, exports low level；
Alternatively,
The rear end matching unit is AD sampling unit, at this point, described export the former modulated signal to rear end matches
Units match, comprising:
The former modulated signal is exported to AD sampling unit, the AD sampling unit determines the electricity of the former modulated signal
Pressure amplitude angle value exports 1 if the voltage amplitude value exceeds preset voltage amplitude threshold value, otherwise, output 0.
6th aspect of the embodiment of the present invention, provides a kind of near field channel radio based on near-field communication front end hardware circuit
Letter method, comprising:
Carrier wave is modulated according to the information of transmission, obtains modulated signal；
The modulated signal is sent to near-field communication terminal by communication interface pin units, so that the near-field communication
Terminal receives the modulated signal by near-field communication aerial.
The modulated signal is passed through described in the first possible implementation of the 6th aspect in conjunction with the 6th aspect
Communication interface pin units are sent to near-field communication terminal, so that the near-field communication terminal receives institute by near-field communication aerial
After stating modulated signal, comprising:
The modulated response signal that the near-field communication terminal is sent, the response letter are received by near-field communication aerial
It number carries out response to received former modulated signal and generates to obtain for the micro-control unit of the near-field communication terminal；
The carrier wave for the modulated response that the near-field communication terminal is sent is filtered out by detection unit；
The signal after carrier wave will be filtered out to export by communication interface pin units to micro-control unit.
Existing beneficial effect is the embodiment of the present invention compared with prior art: due to that can filter out received modulated signal
In carrier wave, former modulated signal is obtained, and the original modulated signal is sent to micro-control unit, it is therefore not necessary to using existing
NFC chip can be achieved with the purpose of near-field communication, to reduce cost, and due to only passing through near-field communication aerial, detection unit
It can be achieved with corresponding function with communication interface pin units, it is therefore, simple with the communication interaction of reader, so as to have
Effect reduces power consumption.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the exemplary circuit of the first near-field communication front end hardware circuit provided in an embodiment of the present invention；
Fig. 2 is the exemplary circuit of rear end matching unit in near-field communication front end hardware circuit provided in an embodiment of the present invention；
Fig. 3 is the exemplary circuit of second of near-field communication front end hardware circuit provided in an embodiment of the present invention；
Fig. 4 is the exemplary circuit of the third near-field communication front end hardware circuit provided in an embodiment of the present invention；
Fig. 5 is the first near field communication side based on near-field communication front end hardware circuit provided in an embodiment of the present invention
The flow chart of method；
Fig. 6 is the second provided in an embodiment of the present invention near field communication side based on near-field communication front end hardware circuit
The flow chart of method.
Specific embodiment
In being described below, for illustration and not for limitation, the tool of such as particular system structure, technology etc is proposed
Body details, to understand thoroughly the embodiment of the present invention.However, it will be clear to one skilled in the art that there is no these specific
The present invention also may be implemented in the other embodiments of details.In other situations, it omits to well-known system, device, electricity
The detailed description of road and method, in case unnecessary details interferes description of the invention.
In order to illustrate technical solutions according to the invention, the following is a description of specific embodiments.
Fig. 1 shows the exemplary circuit of the first near-field communication front end hardware circuit provided in an embodiment of the present invention, in Fig. 1
In, the near-field communication front end hardware circuit includes:
Near-field communication aerial, detection unit 100 and communication interface pin units 14；
The near-field communication aerial includes near field coil 2 and matching capacitance C1, frequency and the selection of the near field coil 2
Carrier frequency matching；
The detection unit 100 includes one-way conduction unit 11 and filter unit 12, for filtering out received modulated signal
In carrier wave, obtain former modulated signal, the detection unit 100 is connect with the near field coil 2；
It is worth noting that detection unit 100 can also only include filter unit 12, need unidirectionally to believe in filter unit 12
Number when, one-way conduction unit 11 can be set in detection unit 100, so that signal is first passed through one-way conduction unit 11 and export unidirectionally
Filter unit 12 is given to after signal.
It is of course also possible to use itself be the filter unit 12 containing one-way conduction function, it at this time can in detection unit 100
Not include one-way conduction unit 11.
Alternatively, the realization of filter unit 12 be do not need to limit it is polar, at this point, can not also be set in detection unit 100
Set one-way conduction unit 11.
When being not provided with one-way conduction unit 11, if the filtered waveform of filter unit 12 has positive negative part, can pass through
The interface of rear end matching unit or MCU processing positive-negative polarity match reception by way of Differential Input.
The communication interface pin units 13 are described logical for exporting the former modulated signal to micro-control unit MCU
Letter interface pin unit 13 is connected between the detection unit 100 and the MCU.
In embodiments of the present invention, near-field communication aerial receives the modulated signal that reader is sent, and filters out the modulation
The carrier wave of signal obtains former modulated signal, then obtained former modulated signal is sent to MCU.Since received tune can be filtered out
Carrier wave in signal processed obtains former modulated signal, and the original modulated signal is sent to micro-control unit, it is therefore not necessary to using
Existing NFC chip can be achieved with the purpose of near-field communication, to reduce cost, and due to only passing through near-field communication aerial, inspection
Wave unit and communication interface pin units can be achieved with corresponding function, therefore, simple with the communication interaction of reader, thus
It can be effectively reduced power consumption.
Fig. 2 shows the example electricity of rear end matching unit in near-field communication front end hardware circuit provided in an embodiment of the present invention
Road, for ease of description, only the parts related to the present invention are shown.
Optionally, the near-field communication front end hardware circuit further include:
Rear end matching unit 14 for the former modulated signal to be made decisions matching, and the signal after matching is passed through
To the micro-control unit, the rear end matching unit 14 is connected to the detection list for the output of communication interface pin units 13
Between member 100 and the communication interface pin units 13.
Optionally, the rear end matching unit 14 is to compare judgement unit or AD sampling unit；
It is described relatively judgement unit include:
Comparator U1 and resistance R2, resistance R3；
The positive input of the comparator U1 is connect with the output end of the filter unit 12, and the comparator U1's is anti-
It is grounded to input terminal by the resistance R2, the reverse input end of the comparator U1 also passes through the resistance R3 and the micro-control
The input/output interface of unit processed connects, and the output end of the comparator U1 and the reception signal end of the micro-control unit connect
It connects；
It is worth noting that the connection of the positive input and reverse input end of comparator can be exchanged, it is defeated when exchanging
Enter the opposite in phase of signal, or Differential Input can be used.
In embodiments of the present invention, valid data are differentiated by comparing judgement unit, resistance R2, electricity can be passed through
It hinders R3 and amplitude threshold is set, comparator U1 compared with amplitude threshold, if input value is greater than amplitude threshold, compares current input value
High level signal is exported compared with device U1, if input value is less than amplitude threshold, comparator U1 exports low level signal, and by output
Low and high level signal is sent to processing chip and carries out back-end processing.
Draw it is, of course, also possible to be connected to detection unit 100 as AD sampling unit using analog-digital converter with communication interface
Between foot unit 13.
In embodiments of the present invention, by AD sampled sense voltage range value, voltage amplitude value meets or exceeds restriction threshold
When value, sampling unit exports high level, and when voltage amplitude value is lower than threshold value is limited, sampling unit exports low level, when AD is sampled,
Modulation system is not limited to OOK, extracts the waveform of former modulation intelligence, can also use other modulator approaches such as ASK.
Fig. 3 shows the examples of circuits of second of near-field communication front end hardware circuit provided in an embodiment of the present invention, described
Near-field communication front end hardware circuit further includes load modulation unit 15.
It is concurrent to carry out load modulation for the load variation by controlling the near field coil for the load modulation unit 15
Modulated signal is sent, the load modulation unit 15 is connect with the detection unit 100.
Fig. 4 shows the examples of circuits of the third near-field communication front end hardware circuit provided in an embodiment of the present invention, in Fig. 4
In, the load modulation unit 15 includes:
On-off circuit module 151 and load control module 152；
The first end of the load control module 152 is connect with the detection unit 100, the load control module 152
Second end connect with the current input terminal of the on-off circuit module 151, the current output terminal of the on-off circuit module 151
Ground connection, the first control terminal GPIO, the second control terminal TX of the on-off circuit module 151 pass through the communication interface pin respectively
Unit 13 is connect with the input/output interface GPIO of the micro-control unit, transmission signal end TX.
Preferably, on-off circuit module 151 includes:
Second switch Q2 and third switching tube Q3；
The current input terminal of second switch Q2 is the current input terminal of on-off circuit module 151, second switch Q2's
Current output terminal is the current output terminal of on-off circuit module 151, and the control terminal of second switch Q2 is with third switching tube Q3's
Current output terminal connection, the current input terminal of third switching tube Q3 are the first control terminal of on-off circuit module 151, third switch
The control terminal of pipe Q3 is the second control terminal of on-off circuit module 151.
In embodiments of the present invention, second switch Q2 and third switching tube Q3 constitutes switching circuit, passes through opening for metal-oxide-semiconductor
Concern changes the load that can change coil, and coil load changes the transmit coil that can be coupled to reader end, what reader passed through
Transmit coil load variation can demodulate modulation intelligence.
False triggering in order to prevent, it is same by TX and bus extender (General Purpose Input Output, GPIO)
When control load switch.
Certainly, on-off circuit module 151 can also be realized by a switching tube, or use a switching tube and concatenation
Resistance at switch controlled end is realized.
In embodiments of the present invention, on-off circuit module 151 plays load modulating action, can be only there are two switch shape
The load modulation of state or a range,
Load control module 152 includes:
Resistance R4；
The both ends of resistance R4 are respectively the first end and second end of load control module 152.
Optionally, resistance R4 can also be connected in parallel with a capacitor, and form load control module 152.
Communication interface pin units 13 are made of RX, TX pin, and RX/TX can be directly connected to micro-control unit MCU etc.
Chip, or the chips such as micro-control unit MCU are connected to by rear end matching unit.
The embodiment of the invention also provides a kind of near-field communication terminal, the front end hardware circuit packet of the near-field communication terminal
Include the near-field communication front end hardware circuit of Fig. 1 to Fig. 4.
The embodiment of the invention also provides a kind of reader, the front end hardware circuit of the reader includes Fig. 1, Fig. 3, figure
4 near-field communication front end hardware circuit.
The embodiment of the invention also provides a kind of near field communication system, the near field communication system includes above-mentioned
Near-field communication terminal and reader.
Fig. 5 shows the first near field channel radio based on near-field communication front end hardware circuit provided in an embodiment of the present invention
The flow chart of letter method, the Fig. 5 mainly describe near-field communication terminal (reader and the near field from this side of near-field communication terminal
Communication terminal is mating) and reader with the data interactive method of passive near field communication mode, comprising:
Step S51 receives the modulated signal that reader is sent by near-field communication aerial, and the near-field communication aerial includes
Near field coil and matching capacitance.
Wherein, which can be existing standard interface signal, such as UART, IIC, SPI, single wire transmission agreement
Deng being also possible to the signal of the modulation formats such as frequency modulation, the amplitude modulation of customized low speed, the waveform of signal can be rectangular wave, just
String wave, triangular wave or waveform customization.
Step S52 filters out the carrier wave of the modulated signal by detection unit, obtains former modulated signal.
Specifically, the carrier wave of modulated signal is filtered out by customized detection unit, interactive mode is simple.
Step S53 exports the former modulated signal to micro-control unit by communication interface pin units.
Optionally, in order to export echo signal, then the step S53 includes:
A1, the former modulated signal is exported to the matching of rear end matching unit.Wherein, rear end matching unit is to compare differentiation
Unit or AD sampling unit.
A2, the signal after rear end matching unit matching is exported by the communication interface pin units to described micro-
Control unit.
Due to exporting to the signal of MCU circuit to be matched by match circuit, satisfactory mesh can be exported
Mark signal.
Optionally, near-field communication terminal needs to respond received former modulated signal, and response signal is transmitted back to
Reader, then after the step S53, comprising:
B1, the former modulated signal is responded in the micro-control unit, after generating response signal, according to the sound
Induction signal control load modulation unit, is loaded by the load variation that the load modulation unit controls the near field coil
Modulation.
B2, modulated response signal is sent to the reader.
Specifically, right by ASK (amplitude shift key modulation) or OOK (on-off keying) using the response signal of transmission as foundation
Near field coil equivalent load is modulated.The antenna (or coil) of near-field communication terminal (such as radio-frequency card) is reader transmitting antenna
The load of (or coil), radio-frequency card make reader by changing the parameter (such as resonance and detuning) in near-field communication aerial circuit
End is modulated, to realize the data transmission for snapping into reader from radio frequency with faint energy, and then reduces power consumption.
Optionally, the load modulation unit includes on-off circuit module, is receiving shape to reduce near-field communication terminal
To the influence of other communication coils, in the modulated signal for receiving reader transmission by near-field communication aerial, packet when state
It includes:
Control that the on-off circuit module is in an off state, so that the electric current by the near-field communication aerial is less.
When near-field communication terminal is in reception state, switching circuit or switching device are in an off state, at this point, the near field
The near-field communication aerial equivalent impedance of communication terminal is very big, by electric current very little, keep low power consumpting state, hardly consumption penetrate
Frequency energy, even if, there are many when the coil of near field, which also hardly consumes radio frequency energy on the same circuit board
Amount, avoids the influence to other communication coils.
Optionally, the rear end matching unit be compare judgement unit, at this point, it is described by the former modulated signal export to
The matching of rear end matching unit, comprising:
The former modulated signal is exported to the relatively judgement unit, if the amplitude of the original modulated signal is more than default
Amplitude threshold, then the relatively judgement unit exports high level, otherwise, exports low level.
Alternatively,
The rear end matching unit is AD sampling unit, at this point, described export the former modulated signal to rear end matches
Units match, comprising:
The former modulated signal is exported to AD sampling unit, the AD sampling unit determines the electricity of the former modulated signal
Pressure amplitude angle value exports 1 if the voltage amplitude value exceeds preset voltage amplitude threshold value, otherwise, output 0.
In the embodiment of the present invention, since the communication of near-field communication terminal and reader is by near field coil equivalent load
It is modulated realization, for example, the antenna (or coil) of near-field communication terminal is the load of reader transmitting antenna (or coil), closely
Communication terminal modulates reader end by changing the parameter (such as resonance and detuning) in near-field communication aerial circuit, thus
The data transmission with faint energy from near-field communication terminal to reader is realized, it is easy to operate, and then reduce power consumption.And
And can be achieved with the purpose of near-field communication without existing NFC chip, to reduce cost.
Fig. 6 shows the second provided in an embodiment of the present invention near field channel radio based on near-field communication front end hardware circuit
The flow chart of letter method, which mainly describes the reader from this side of reader, and (reader is matched with near-field communication terminal
Set) and near-field communication terminal with the data interactive method of passive near field communication mode, comprising:
Step S61 is modulated carrier wave according to the information of transmission, obtains modulated signal.
When reader is toward near-field communication terminal write information: reader provides carrier signal.The reader is to send information
For foundation, carrier signal is modulated by ASK (amplitude shift key modulation) or OOK (on-off keying), certainly, the reader
The equivalent effect of amplitude modulation can be reached indirectly by deviateing the matching frequency of coil by adjusting carrier frequency.Wherein,
The information of transmission can be existing standard interface signal, such as UART, IIC, SPI, and single wire transmission agreement etc. is also possible to make by oneself
The signal of the modulation formats such as frequency modulation, the amplitude modulation of low speed of justice, the waveform of signal can be rectangular wave, sine wave, triangular wave or from
Define waveform.
The modulated signal is sent to near-field communication terminal by communication interface pin units, so that described by step S62
Near-field communication terminal receives the modulated signal by near-field communication aerial.
Optionally, when reader reads information from near-field communication terminal, i.e., after the step S62, comprising:
C1, the modulated response signal that the near-field communication terminal is sent, the sound are received by near-field communication aerial
Induction signal carries out response generation to received former modulated signal for the micro-control unit of the near-field communication terminal and obtains.
C2, the carrier wave that the modulated response that the near-field communication terminal is sent is filtered out by detection unit.
C3, it the signal after carrier wave will be filtered out is exported by communication interface pin units to micro-control unit.
In the embodiment of the present invention, since the communication of reader and near-field communication terminal is by near field coil equivalent load
It is modulated realization, it is achieved that the data transmission with faint energy from near-field communication terminal to reader, easy to operate,
And then reduce power consumption.Also, it can be achieved with the purpose of near-field communication without existing NFC chip, to reduce cost.
It should be understood that the size of the serial number of each step is not meant that the order of the execution order in above-described embodiment, each process
Execution sequence should be determined by its function and internal logic, the implementation process without coping with the embodiment of the present invention constitutes any limit
It is fixed.
It is apparent to those skilled in the art that for convenience of description and succinctly, only with above-mentioned each function
Can unit, module division progress for example, in practical application, can according to need and by above-mentioned function distribution by different
Functional unit, module are completed, i.e., the internal structure of described device is divided into different functional unit or module, more than completing
The all or part of function of description.Each functional unit in embodiment, module can integrate in one processing unit, can also
To be that each unit physically exists alone, can also be integrated in one unit with two or more units, it is above-mentioned integrated
Unit both can take the form of hardware realization, can also realize in the form of software functional units.In addition, each function list
Member, the specific name of module are also only for convenience of distinguishing each other, the protection scope being not intended to limit this application.Above system
The specific work process of middle unit, module, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, is not described in detail or remembers in some embodiment
The part of load may refer to the associated description of other embodiments.
Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician
Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed
The scope of the present invention.
In embodiment provided by the present invention, it should be understood that disclosed device and method can pass through others
Mode is realized.For example, system embodiment described above is only schematical, for example, the division of the module or unit,
Only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components can be with
In conjunction with or be desirably integrated into another system, or some features can be ignored or not executed.Another point, it is shown or discussed
Mutual coupling or direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING of device or unit or
Communication connection can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, the technical solution of the embodiment of the present invention
Substantially all or part of the part that contributes to existing technology or the technical solution can be with software product in other words
Form embody, which is stored in a storage medium, including some instructions use so that one
Computer equipment (can be personal computer, server or the network equipment etc.) or processor (processor) execute this hair
The all or part of the steps of bright each embodiment the method for embodiment.And storage medium above-mentioned include: USB flash disk, mobile hard disk,
Read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic
The various media that can store program code such as dish or CD.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although referring to aforementioned reality
Applying example, invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each
Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified
Or replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution should all
It is included within protection scope of the present invention.
Claims (14)
1. a kind of near-field communication front end hardware circuit, which is characterized in that the near-field communication front end hardware circuit includes:
Near-field communication aerial, detection unit, load modulation unit and communication interface pin units；
The near-field communication aerial includes near field coil and matching capacitance, the frequency of the near field coil and the carrier frequency of selection
Matching；
The detection unit obtains former modulated signal for filtering out the carrier wave in received modulated signal, the detection unit with
The near field coil connection；
The communication interface pin units, for exporting the former modulated signal to micro-control unit, the communication interface is drawn
Foot unit is connected between the detection unit and the micro-control unit；
The load modulation unit carries out load modulation for the load variation by controlling the near field coil and sends modulation
The input/output interface and transmission signal of signal, the load modulation unit and the detection unit and the micro-control unit
End connection；
The micro-control unit is used to control the near field line simultaneously by the input/output interface and the transmission signal end
The load switch of circle.
2. near-field communication front end hardware circuit as described in claim 1, which is characterized in that the near-field communication front end hardware electricity
Road further include:
Rear end matching unit for the former modulated signal to be made decisions matching, and the signal after matching is led to by described
Letter interface pin unit is exported to the micro-control unit, and the rear end matching unit is connected to the detection unit and leads to described
Believe between interface pin unit.
3. near-field communication front end hardware circuit as claimed in claim 2, which is characterized in that the rear end matching unit includes:
The rear end matching unit is to compare judgement unit or AD sampling unit.
4. near-field communication front end hardware circuit as described in claim 1, which is characterized in that the load modulation unit includes:
On-off circuit module and load control module；
The first end of the load control module is connect with the detection unit, the second end of the load control module with it is described
The current input terminal of on-off circuit module connects, the current output terminal ground connection of the on-off circuit module, the switching circuit mould
Input of the first control terminal, the second control terminal of block respectively by the communication interface pin units and the micro-control unit is defeated
Outgoing interface sends signal end connection.
5. a kind of near-field communication terminal, which is characterized in that the front end hardware circuit of the near-field communication terminal includes claim 1
To 4 described in any item near-field communication front end hardware circuits.
6. a kind of reader, which is characterized in that the front end hardware circuit of the reader includes any one of claims 1 to 3 institute
The near-field communication front end hardware circuit stated.
7. a kind of near field communication system, which is characterized in that the near field communication system includes described in claim 5
Near-field communication terminal and reader as claimed in claim 6.
8. a kind of near field communication method based on the described in any item near-field communication front end hardware circuits of Claims 1 to 4,
It is characterised by comprising:
By near-field communication aerial receive reader send modulated signal, the near-field communication aerial include near field coil and
With capacitor；
The carrier wave that the modulated signal is filtered out by detection unit obtains former modulated signal；
The former modulated signal is exported by communication interface pin units to micro-control unit.
9. near field communication method as claimed in claim 8, which is characterized in that described pass through the former modulated signal is led to
Letter interface pin is exported to micro-control unit, comprising:
The former modulated signal is exported to rear end matching unit and is matched；
Signal after rear end matching unit matching is exported by the communication interface pin units to the microcontroller list
Member.
10. near field communication method as claimed in claim 8, which is characterized in that lead to the former modulated signal described
Communication interface pin units are crossed to export to micro-control unit, comprising:
The former modulated signal is responded in the micro-control unit, after generating response signal, according to the response signal
Control load modulation unit carries out load modulation by the load variation that the load modulation unit controls the near field coil；
Modulated response signal is sent to the reader.
11. near field communication method as claimed in claim 8, which is characterized in that the load modulation unit includes switch
Circuit module, in the modulated signal for receiving reader transmission by near-field communication aerial, comprising:
Control that the on-off circuit module is in an off state, so that the electric current by the near-field communication aerial is less.
12. near field communication method as claimed in claim 9, which is characterized in that the rear end matching unit is to compare to sentence
Other unit, at this point, described export the former modulated signal to rear end matching unit matches, comprising:
The former modulated signal is exported to the relatively judgement unit, if the amplitude of the original modulated signal is more than predetermined amplitude
Threshold value, then the relatively judgement unit exports high level, otherwise, exports low level；
Alternatively, the rear end matching unit is AD sampling unit, at this point, described export the former modulated signal to rear end matches
Units match, comprising:
The former modulated signal is exported to AD sampling unit, the AD sampling unit determines the voltage amplitude of the former modulated signal
Angle value exports 1 if the voltage amplitude value exceeds preset voltage amplitude threshold value, otherwise, output 0.
13. a kind of near field communication side based on the described in any item near-field communication front end hardware circuits of Claims 1 to 4
Method characterized by comprising
Carrier wave is modulated according to the information of transmission, obtains modulated signal；
The modulated signal is sent to near-field communication terminal by communication interface pin units, so that the near-field communication terminal
The modulated signal is received by near-field communication aerial.
14. near field communication method as claimed in claim 13, which is characterized in that pass through the modulated signal described
Communication interface pin units are sent to near-field communication terminal, so that the near-field communication terminal receives institute by near-field communication aerial
After stating modulated signal, comprising:
The modulated response signal that the near-field communication terminal is sent is received by near-field communication aerial, the response signal is
The micro-control unit of the near-field communication terminal carries out response generation to received former modulated signal and obtains；
The carrier wave for the modulated response that the near-field communication terminal is sent is filtered out by detection unit；
The signal after carrier wave will be filtered out to export by communication interface pin units to micro-control unit.
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| CN201710184291.8A CN106909865B (en) | 2017-03-24 | 2017-03-24 | Near-field communication front end hardware circuit, terminal, reader, system and method |
| PCT/CN2018/080227 WO2018171723A1 (en) | 2017-03-24 | 2018-03-23 | Near field communication front-end hardware circuit, terminal, reader/writer, system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710184291.8A CN106909865B (en) | 2017-03-24 | 2017-03-24 | Near-field communication front end hardware circuit, terminal, reader, system and method |
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| WO2018171723A1 (en) * | 2017-03-24 | 2018-09-27 | 深圳市文鼎创数据科技有限公司 | Near field communication front-end hardware circuit, terminal, reader/writer, system and method |
| CN107832818B (en) * | 2017-12-08 | 2024-03-29 | 江苏本能科技有限公司 | Radio frequency identification reader-writer based on multi-region identification and road side parking management system |
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| CN101276399A (en) * | 2007-03-28 | 2008-10-01 | 英赛康特雷斯公司 | Method of coupling a contactless integrated circuit to an nfc component |
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