CN106341164B - Low-power consumption wireless near field communication circuit - Google Patents
Low-power consumption wireless near field communication circuit Download PDFInfo
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- CN106341164B CN106341164B CN201610907564.2A CN201610907564A CN106341164B CN 106341164 B CN106341164 B CN 106341164B CN 201610907564 A CN201610907564 A CN 201610907564A CN 106341164 B CN106341164 B CN 106341164B
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- 238000004891 communication Methods 0.000 title claims abstract description 36
- 230000005540 biological transmission Effects 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 239000013078 crystal Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 4
- 230000005611 electricity Effects 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
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Classifications
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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
- H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
- H04B5/48—Transceivers
-
- 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
- H04B5/72—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for local intradevice communication
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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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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
The invention discloses a kind of low-power consumption wireless near field communication circuits, including oscillating circuit, modulation circuit, resonance circuit, detecting circuit；Data transmission flow is, serial ports sends data to signal modulation circuit, and the data that signal modulation circuit sends serial ports are modulated, and modulated signal is tuned by resonance circuit, signal after tuning is resonance signal, and resonance signal is sent it by antenna in the form of an electromagnetic wave；Data receiver flow is that antenna receives neighbouring electromagnetic wave signal and converted electric signal, and detection is carried out by detecting circuit, and the signal after detection is sent to serial ports reception；The carrier wave that modulated process needs is generated by oscillating circuit, and oscillating circuit is made of crystal oscillator and amplifier, and output frequency is the sine wave of 13.56MHz.The present invention does not need the function that wireless near field communication can be completed in dedicated NFC integrated chips, and entire circuit is formed using component is commonly used, and at low cost, power consumption is few, is suitable for the communication protocol of serial ports transmission.
Description
Technical field
The present invention relates to fields of communication technology, particularly relate to a kind of low-power consumption wireless near field communication circuit.
Background technology
Existing wireless near field communication is commonly referred to as NFC, and NFC is a kind of wireless communication technique of short distance high frequency,
13.56MHz frequencies are run in 10 cm distances.
Induction type card reader, icah wavw and point-to-point function are combined in NFC chip.Between several centimeters of distances
In 13.56MHz frequency ranges of operation, by radiofrequency signal automatic identification near-field devices and related data is obtained, identifies work
Without manual intervention, any two equipment is not necessarily to wiring, so that it may to realize mutual communication, meet any two wireless device
Between information exchange, access to content, service exchange.
For near field communication, NFC is everybody first choice, but the NFC of standard use special chip, price compared with
Height, and agreement is complicated, it is higher with power consumption in the product, it is unsatisfactory for cost and the very high product utilization of power consumption requirements.
It is very high to the power consumption requirements of equipment for the product of some super low-power consumptions, such as intellectual water meter, and communication need to follow
Communication protocol in industry, if by wireless near field communication in the equipment as intellectual water meter, must just have can be
Super low-power consumption requires lower progress, and the communication mode that communication protocol can customize.Intellectual water meter with NFC if it is desired that realize low coverage
It from wireless communication, then needs to receive its communication protocol, and is unsatisfactory for the communication protocol in industry.
Invention content
The present invention proposes a kind of low-power consumption wireless near field communication circuit, solves NFC prices height, agreement in the prior art
Complexity, the problem of not being suitable for intellectual water meter.
The technical proposal of the invention is realized in this way：
A kind of low-power consumption wireless near field communication circuit, including oscillating circuit, modulation circuit, resonance circuit, detecting circuit
And antenna；Data transmission flow is that serial ports sends data to signal modulation circuit, the data that signal modulation circuit sends serial ports
It is modulated, modulated signal is tuned by resonance circuit, and the signal after tuning is resonance signal, and resonance signal passes through day
Line sends it in the form of an electromagnetic wave；Data receiver flow is that antenna receives neighbouring electromagnetic wave signal and converted electricity
Signal carries out detection by detecting circuit, and the signal after detection is sent to serial ports reception；The carrier wave that modulated process needs is by oscillation electricity
Road generates, and oscillating circuit is made of an amplifier and crystal oscillator, and crystal oscillator plays the role of frequency selection；Modulation circuit is by logic gate
Circuit forms, and carrier wave and data-signal are modulated；Resonance circuit is LC oscillating circuits, and L is antenna, has inductance characteristic,
Electromagnetic wave signal is directly sent by antenna L；Detecting circuit is by the capacitance reception antenna L signals received and carries out detection, defeated
Go out for serial data waveform；In the modulation circuit gate circuit using NAND gate U2, the NAND gate U2 an input terminal with
The serial ports TX connections of transmission data, another input terminal are connect with the output end of the oscillating circuit, and the NAND gate U2's is defeated
Outlet exports modulated signal.
Further, the amplifier of the oscillating circuit uses NOT gate U1, and in one feedback resistance R1 of crystal oscillator both ends parallel connection,
Feedback resistance R1 makes NOT gate U1 be operated in linear zone, it is made to obtain gain, and oscillating circuit output frequency is the sine of 13.56MHz
Wave.
Further, the resonance circuit is made of resistance R2, capacitance C1, capacitance C2 and antenna L, and the one of the resistance R2
End is connect with the output end of the modulation circuit, and the other end is connect with one end of the capacitance C1, the other end of the capacitance C1
It is connect with one end of the capacitance C2, the other end ground connection of the capacitance C2, the antenna L is connected in parallel on the two of the capacitance C2
End, LC resonance circuit is formed by capacitance C1, capacitance C2 and antenna L, by the electricity for adjusting capacitance C1, capacitance C2 and the antenna L
Inductance value makes the resonance circuit be tuned modulated signal, obtains resonance signal, while the antenna L is electric by resonance signal
The form of magnetic wave is sent.
Further, the detecting circuit includes capacitance C3, resistance R3, resistance R4, resistance R5 and triode T, the electricity
The one end for holding C3 is connect with the antenna L, and the other end of the capacitance C3 is connect with the base stage of the triode T, the resistance
The base stage of connecting triode T, makes triode T be operated in linear zone, the triode T after R3 and R4 divides supply voltage
Collector positive pole is connected to by the resistance R5, the output of the current collection extremely detecting circuit of triode T connects MCU
Serial ports receive RX.
Further, the modulation circuit and detecting circuit are connect with MCU respectively, and the receipts of data are completed by the serial ports of MCU
Hair；The MCU is respectively that modulation circuit, oscillating circuit and detecting circuit independent control are powered, described when not transceiving data
MCU stops powering to the modulation circuit, oscillating circuit and detecting circuit.
The beneficial effects of the present invention are：The function that dedicated NFC integrated chips complete wireless near field communication is not needed,
At low cost, oscillating circuit is formed using gate circuit and discrete component, and at low cost, power consumption is few, is suitable for the communication protocols of serial ports transmission
View, can be applied to the low-power consumption product such as intellectual water meter, meets communication protocol in its industry.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without having to pay creative labor, may be used also for those of ordinary skill in the art
With obtain other attached drawings according to these attached drawings.
Fig. 1 is the functional block diagram of low-power consumption wireless near field communication circuit of the present invention；
Fig. 2 is the circuit diagram of low-power consumption wireless near field communication circuit of the present invention
Fig. 3 is the circuit waveform figure of low-power consumption wireless near field communication circuit of the present invention.
In figure, 1- oscillating circuits；2- modulation circuits；3- resonance circuits；4- detecting circuits；5- antennas.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
As depicted in figs. 1 and 2, the present invention proposes a kind of low-power consumption wireless near field communication circuit, including oscillating circuit
1, modulation circuit 2, resonance circuit 3 (including antenna L), detecting circuit 4；Transmitting portion workflow is that serial ports is sent data to
Signal modulation circuit 2, signal modulation circuit 2 are modulated the signal that serial ports is sent out；Resonance circuit 3 to modulated signal into
Row tuning is simultaneously sent by antenna L by the form of electromagnetic wave；Receiving portion workflow is that antenna L receives the electromagnetic wave of surrounding
It is translated into electric signal, detecting circuit 4 carries out detection, after detection by the electric signal after the conversion of capacitance C3 reception antennas
Signal is sent to serial ports reception；Serial ports is modulated required carrier signal and is generated by oscillating circuit 1；Oscillating circuit is amplified by one
Device and crystal oscillator composition, crystal oscillator play the role of frequency selection；Modulation circuit is made of logic gates, by carrier wave and data-signal
It is modulated；Resonance circuit is LC oscillating circuits, and L is antenna, and there is inductance characteristic, electromagnetic wave signal directly to be sent out by antenna L
It send；Detecting circuit is by the capacitance reception antenna L signals received and carries out detection, exports as serial data waveform.The present invention is not
Dedicated NFC integrated chips are needed to complete the function of wireless near field communication, at low cost, oscillating circuit 1 is using gate circuit and divides
Vertical element composition, at low cost, power consumption is few, is suitable for the communication protocol of serial ports transmission, can be applied to the low-power consumption such as intellectual water meter
Product meets communication protocol in its industry.
Circuit of the present invention is referred to as SNFC, means Simple NFC.
Specifically, as shown in Figure 1, in the present embodiment, the serial ports of transmission data is the serial ports that UART sent, received data
For the UART receiving interfaces of microcontroller.Oscillating circuit is made of resistance R1, crystal oscillator X1 and NOT gate U1, after circuit works, oscillation
Circuit output frequency is the sine wave of 13.56MHz.
Transmitting wirelessly flow is：The power supply of oscillating circuit 1 is opened, 1 the operation is stable of oscillating circuit, opening signal modulation are waited for
The power supply of circuit 2, MCU adjust serial ports waveform with carrier waveform by serial ports transmission data waveform, signal modulation circuit 2
System, modulated waveform is emitted by antenna in a manner of electromagnetic wave after 3 resonance of resonance circuit, when serial data is sent completely
Afterwards, oscillating circuit 1 and 2 power supply of signal modulation circuit are closed；Wireless receiving flow is：Opening can be into after 4 power supply of detecting circuit
The reception of row electromagnetic wave signal, the electromagnetic wave around resonance circuit reception, and resonance, detecting circuit are carried out to electromagnetic wave signal
4 pairs of resonance signals carry out detection, and detecting circuit 4 completes the function of signal amplification and demodulation, obtain the waveform that serial ports receives data,
It is received by serial ports, after serial data finishes receiving, closes receiving circuit power supply.
, can be by the resistance value of adjusting R2 to adjust electromagnetic radiation power when circuit works, increasing the resistance value of R2 can drop
Power consumption when low circuit works；When circuit does not work, the power supply of closing circuit can be controlled MCU by program makes circuit be zero consumption
Electricity.
The amplifier of oscillating circuit uses NOT gate U1, and makes in one feedback resistance R1 of crystal oscillator both ends parallel connection, feedback resistance R1
NOT gate U1 is operated in linear zone, it is made to obtain gain, and the function of amplifier is realized by NOT gate U1 and feedback resistance R1.Oscillating circuit
Output frequency is the sine wave of 13.56MHz.
Modulation circuit 2 is made of NAND gate U2, an input terminal of NAND gate U2 and the serial ports TX connections of transmission data, separately
The output end of one input terminal and oscillating circuit connects, and the output of NAND gate U2 is modulated signal.
Resonance circuit 3 is made of resistance R2, capacitance C1, capacitance C2 and antenna L, one end of resistance R2 and modulation circuit it is defeated
Outlet connects, and the other end is connect with one end of capacitance C1, and the other end of capacitance C1 is connect with one end of capacitance C2, and capacitance C2's is another
One end is grounded, and antenna L is connected in parallel on the both ends of capacitance C2, is formed LC resonance circuit by capacitance C1, capacitance C2 and antenna L, is adjusted electricity
The inductance value for holding C1, capacitance C2 and antenna L, makes resonance circuit be tuned modulated signal, obtains resonance signal, then pass through
Antenna L sends signal in the form of an electromagnetic wave.Specifically, the inductance value by adjusting capacitance and antenna L, makes resonance circuit pair
Modulated signal is tuned, and obtains resonance signal, while antenna L sends resonance signal in the form of an electromagnetic wave.
Detecting circuit includes capacitance C3, resistance R3, resistance R4, resistance R5 and triode T, one end and the antenna L of capacitance C3
Connection, the other end of capacitance C3 are connect with the base stage of triode T, and resistance R3 and R4 connects three poles after being divided to supply voltage
The base stage of pipe T makes triode T be operated in linear zone, and the collector of triode T is connected to positive pole by pull-up resistor R5,
The output of the current collection of triode T extremely detecting circuit, the serial ports for connecting MCU receive RX.
Specifically, triode is NPN type.
In the present embodiment, modulation circuit 2, resonance circuit 3 and detecting circuit 4 are formed using gate circuit and discrete component,
So that cost of the present invention is lower.
Modulation circuit and detecting circuit are connect with MCU respectively, and the transmitting-receiving of data is completed by the serial ports of MCU；MCU is respectively to adjust
Circuit, oscillating circuit and the power supply of detecting circuit independent control processed, when not transceiving data, MCU stops to modulation circuit, oscillation electricity
Road and detecting circuit power supply.
Specifically, MCU is respectively NOT gate U1 and NAND gate U2 provides power supply, MCU can also be that detecting circuit is powered so that
Modulation circuit 2, resonance circuit 3 and 4 power supply of detecting circuit can be controlled individually, and only just be consumed when needing to send or receive data
Electricity, MCU are powered by control circuit each section, can reasonably manage the electricity that circuit is consumed, low work(is furthermore achieved
Consumption.Corresponding power supply is closed to realize circuit zero-power by software when not transceiving data.
It is set as high level when the serial ports TX idle states of transmission data.
The present invention is operated in half-duplex operation state.TX is serial ports sending port, is height when idle state, U2 is defeated after being powered
Go out for low level, TX radiating circuits do not consume electric current at this time.Detecting circuit 4 is powered, R3 and R4 divide RX_VCC
Pressure makes NPN pipes T connect the resistance value of RX, R3 and the R4 of serial ports just at short status, the collector of T is closed when circuit does not communicate
It can select very greatly, the electric current consumed on R3 and R4 in this way also can very little.When stopping powering to U1, crystal oscillator X1 stoppings are shaken
It swings.
When needing transmission data, first U1, U2 are powered, after the X1 starting of oscillations, TX can transmission data, waveform
Waveform as corresponding to " TX " in Fig. 3；When TX is low, U2 outgoing carrier signals, so when TX transmission datas, modulation circuit
Resonance, signal occur after resonance circuit 3 for " modulation " in the signal of outgoing carrier modulation, signal waveform such as Fig. 3, modulated signal
Then electric signal after resonance is converted to radio magnetic wave signal by antenna L and sent by " resonance " in waveform such as Fig. 3；Work as TX
When being high, U2 outputs are low, and the upper no electromagnetic waves of L are sent out；In waveform such as Fig. 3 after resonance " resonance ".
When needing to receive data, serial ports TX need to keep high level, at this time if antenna L receives the electromagnetic wave of surrounding,
Resonance circuit can be then caused to occur resonance, " resonance " corresponding waveform in waveform such as Fig. 3, resonance signal passes through C3, T can be caused to manage
Break-make, adjust C3, R3, R4, R5 value, make receiving circuit complete detection decoding.The current collection of triode T extremely serial ports receives
End, connects the RX of serial ports, and " RX " in waveform such as Fig. 3, the output of RX at this time is that serial ports receives data.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (5)
1. a kind of low-power consumption wireless near field communication circuit, it is characterised in that：Including oscillating circuit, modulation circuit, resonance circuit,
Detecting circuit and antenna；Data transmission flow is that serial ports sends data to signal modulation circuit, and signal modulation circuit sends out serial ports
The data sent are modulated, and modulated signal is tuned by resonance circuit, and the signal after tuning is resonance signal, resonance letter
Number it is sent in the form of an electromagnetic wave by antenna；Data receiver flow is that antenna receives neighbouring electromagnetic wave signal and will
It converts electric signal, and detection is carried out by detecting circuit, and the signal after detection is sent to serial ports reception；The carrier wave that modulated process needs
It is generated by oscillating circuit, oscillating circuit is made of an amplifier and crystal oscillator, and crystal oscillator plays the role of frequency selection；Modulation circuit
It is made of logic gates, carrier wave and data-signal is modulated；Resonance circuit is LC oscillating circuits, and L is antenna, has electricity
Feel characteristic, electromagnetic wave signal is directly sent by antenna L；Detecting circuit passes through the capacitance reception antenna L signals received and progress
Detection exports as serial data waveform；Gate circuit uses NAND gate U2, one of the NAND gate U2 defeated in the modulation circuit
Enter the serial ports TX connections of end and transmission data, another input terminal is connect with the output end of the oscillating circuit, the NAND gate
The output end of U2 exports modulated signal.
2. low-power consumption wireless near field communication circuit according to claim 1, it is characterised in that：The oscillating circuit is put
Big device uses NOT gate U1, and so that NOT gate U1 is operated in linear zone in one feedback resistance R1 of crystal oscillator both ends parallel connection, feedback resistance R1, make
It obtains gain, and oscillating circuit output frequency is the sine wave of 13.56MHz.
3. low-power consumption wireless near field communication circuit according to claim 1, it is characterised in that：The resonance circuit is by electricity
R2, capacitance C1, capacitance C2 and antenna L compositions are hindered, one end of the resistance R2 is connect with the output end of the modulation circuit, another
End is connect with one end of the capacitance C1, and the other end of the capacitance C1 is connect with one end of the capacitance C2, the capacitance C2
Other end ground connection, the antenna L is connected in parallel on the both ends of the capacitance C2, LC resonance formed by capacitance C1, capacitance C2 and antenna L
Circuit makes the resonance circuit adjust modulated signal by adjusting the inductance value of capacitance C1, capacitance C2 and the antenna L
It is humorous, resonance signal is obtained, while the antenna L sends the form of resonance signal electromagnetic wave.
4. low-power consumption wireless near field communication circuit according to claim 1, it is characterised in that：The detecting circuit includes
Capacitance C3, resistance R3, resistance R4, resistance R5 and triode T, one end of the capacitance C3 are connect with the antenna L, the capacitance
The other end of C3 is connect with the base stage of the triode T, and the resistance R3 and R4 connects three poles after being divided to supply voltage
The base stage of pipe T, makes triode T be operated in linear zone, and the collector of the triode T is being connected to power supply just by the resistance R5
Pole, the output of the current collection extremely detecting circuit of triode T, the serial ports for connecting MCU receive RX.
5. low-power consumption wireless near field communication circuit according to claim 1, it is characterised in that：The modulation circuit and inspection
Wave circuit is connect with MCU respectively, and the transmitting-receiving of data is completed by the serial ports of MCU；The MCU is respectively modulation circuit, oscillating circuit
It powers with detecting circuit independent control, when not transceiving data, the MCU stops to the modulation circuit, oscillating circuit and inspection
Wave circuit is powered.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610907564.2A CN106341164B (en) | 2016-10-18 | 2016-10-18 | Low-power consumption wireless near field communication circuit |
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| CN201610907564.2A CN106341164B (en) | 2016-10-18 | 2016-10-18 | Low-power consumption wireless near field communication circuit |
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| CN106341164A CN106341164A (en) | 2017-01-18 |
| CN106341164B true CN106341164B (en) | 2018-08-17 |
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Families Citing this family (3)
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| DE102018117410A1 (en) * | 2018-07-18 | 2020-01-23 | Huf Hülsbeck & Fürst Gmbh & Co. Kg | Device for a vehicle for contactless data transmission |
| CN111178105B (en) * | 2019-12-31 | 2021-08-24 | 上海移为通信技术股份有限公司 | RFID (radio frequency identification) tag information reading device and method |
| CN112683953B (en) * | 2021-01-14 | 2022-11-25 | 东莞理工学院 | Internet of things-based constructed wetland micro-polluted water quality detection sensor and detection device |
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| CN102007705A (en) * | 2008-04-15 | 2011-04-06 | Nxp股份有限公司 | Low power near-field communication devices |
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2016
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|---|---|---|---|---|
| WO2003003596A1 (en) * | 2001-06-29 | 2003-01-09 | Niigata Seimitsu Co., Ltd. | Receiver |
| CN102007705A (en) * | 2008-04-15 | 2011-04-06 | Nxp股份有限公司 | Low power near-field communication devices |
| CN103001897A (en) * | 2011-09-12 | 2013-03-27 | Nxp股份有限公司 | Capacitive communication circuit and method therefor |
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