CN105099527B - A kind of passive NFC communication interface with independent energy reception antenna - Google Patents
A kind of passive NFC communication interface with independent energy reception antenna Download PDFInfo
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- CN105099527B CN105099527B CN201510568117.4A CN201510568117A CN105099527B CN 105099527 B CN105099527 B CN 105099527B CN 201510568117 A CN201510568117 A CN 201510568117A CN 105099527 B CN105099527 B CN 105099527B
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- 238000000034 method Methods 0.000 claims description 8
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- 238000013461 design Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
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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
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- Near-Field Transmission Systems (AREA)
Abstract
The invention belongs to wireless communication fields, and in particular to a kind of passive NFC communication interface with independent energy reception antenna.The passive NFC communication interface includes the NFC passive communications circuit for passive communication and the RF energy receiving circuit that is received for NFC RF energies.The NFC dumbs circuit includes NFC communication antenna, communication antenna match circuit and NFC transceiver；The NFC communication antenna is connect by communication antenna match circuit with the NFC transceiver.The present invention is greatly improved the energy acceptance power of NFC passive communication interfaces, and a large amount of electric energy are provided for the device with passive NFC communication interface.These additional electric energy will allow device to provide more functions, higher performance, better user experience.The present invention greatly expands application range of the NFC passive communications interface within the current and future several years.
Description
Technical field
The invention belongs to wireless communication fields, and in particular to a kind of passive NFC communication with independent energy reception antenna
Interface.
Background technology
NFC (near-field communication), as information carrier, is realized than traditional wireless communication much shorter due to the use of magnetic field
Communication distance（Several centimetres）, have many advantages, such as safe, easy to use.A pith in NFC standard is to high frequency
The succession of RFID passive interfaces allows the communication between active NFC interface and passive NFC interface.Specifically, passive NFC connects
It is itself and external device (ED) power supply that mouth, which receives the RF energy from active NFC interface, to maintain equipment internal arithmetic and outside
Communication.NFC passive interfaces are used for the applications such as wireless payment, Bluetooth pairing, point-to-point transmission, passive label by extensive at present,
And it has a wide range of applications in the following Internet of Things.However, the design of existing passive NFC communication interface is due to being directly inherited from
RFID, energy acceptance efficiency is very low, is only capable of obtaining seldom energy from active NFC interface（About 10mW）, therefore can only maintain
The simple operations of passive device, such as reading and writing internal memory.For being directed to the big of NFC passive interfaces in the current and coming years
Amount application, such as bank's double-interface card, novel visual bank card, intelligent wearable equipment, sensing network, it is so low to connect
It receives power and significantly limits function and performance that these applications can provide.
Existing solution is mainly started with from reduction device power consumption so that this small amount of energy can also maintain device
Normal work.These schemes include to reduce power consumption using newer manufacturing technology（Such as 90nm processing procedures are upgraded to from 130nm processing procedures）、
Increase device dormancy time, reduce device working frequency etc..However, or these means improve installation cost or limit
The performance of device is made.
Invention content
Effectively to solve the problem above-mentioned, the present invention provides a kind of with high reception power, independent energy reception antenna
Passive NFC communication Interface design, come fundamentally solve the problems, such as NFC passive interfaces receive power it is low.
A kind of passive NFC communication interface with independent energy reception antenna, by NFC passive communications circuit and RF energy
Receiving circuit is constituted；
Further, the NFC passive communications circuit is by NFC communication antenna, communication antenna match circuit and NFC transceiver
It constitutes, is responsible for NFC passive communications specially；
Further, the RF energy receiving circuit is matched by RF energy reception antenna, RF energy reception antenna
Circuit, bridge rectifier and DC/DC are constituted, and are responsible for the reception of NFC RF energies specially；
Further, the NFC communication antenna connects NFC transceiver, communication antenna by communication antenna match circuit
The impedance of NFC communication antenna is adjusted to and can be matched with NFC transceiver with circuit, NFC transceiver demodulates NFC communication antenna
The 13.56Mhz signals received, and modulate the 13.56Mhz signals that need to be sent to NFC communication antenna；
Further, the NFC communication antenna only receives the signal of very low energy to ensure that RF energy reception antenna connects
One of most RF energies are received, at least have the following properties that：Low reactance-resistance ratio（<20）, low inductance value (<4uH), with transmitting day
Line lower coupling（The coefficient of coup<0.2）, not 13.56Mhz resonance (after being connect with communication antenna match circuit)；
Further, the RF energy reception antenna connects bridge rectifier by RF energy reception antenna match circuit
Input, the input of the output connection DC/DC of bridge rectifier, the RF energy reception antenna match circuit adjusts RF energy
The RF energy of reception is converted to DC voltage by the resonant frequency of reception antenna and impedance, bridge rectifier, and DC/DC is by the direct current
Voltage voltage stabilizing simultaneously exports；
Further, the RF energy reception antenna has the following properties that：Inductance value is between 3uH to 10uH, Q values exist
20 or more, antenna area is in 100mm2To 5000mm2Between, connect with RF energy reception antenna match circuit after
13.56Mhz resonance；
Further, the RF energy reception antenna match circuit by the impedance of RF energy reception antenna according to reality
Loading condition is adjusted to OK range to improve reception power；
Further, the rectification output end of the RF energy receiving circuit connects the electricity of the passive NFC communication interface
Source, the work for passive NFC communication interface provide whole electric energy；
Further, the passive NFC communication interface is connect by bus with external device (ED), by NFC passive communication circuits
The NFC data received sends external device (ED) to, and receives from external device (ED) NFC data to be sent；
Further, the power supply of the passive NFC communication interface connects external device (ED) by certain forms, is external device (ED)
Work all or part of electric energy is provided.
A kind of passive NFC method with independent energy reception antenna, using above-mentioned passive NFC communication interface,
It is characterized in that, the communication means includes the following steps：
A NFC communication) is carried out respectively using two or more antennas and NFC RF energies receive；
B）The antenna for carrying out NFC communication is controlled to adjust, it is made to receive the signal of very low energy, and by received signal impedance
It is adjusted to and is mutually matched with NFC transceiver；
C）The antenna for carrying out NFC RF energy receptions is controlled to adjust, so that it is improved and receives power.
Further, the step B）In the day line traffic control Q values for NFC communication below 20, inductance value 4uH with
Under, be less than with the coefficient of coup of transmitting antenna 0.2 or not in 13.56Mhz resonance；
The step C）In for NFC RF energies receive antenna specifically control exist：Inductance value is in 3uH-10uH, Q
Value is in 20 or more, antenna area in 100mm2To 5000mm2Between.
Beneficial effects of the present invention：The present invention is greatly improved the energy acceptance power of passive NFC communication interface, to carry
The device of passive NFC communication interface provides a large amount of electric energy.These additional electric energy will allow device to provide more functions, higher
Performance, better user experience.The present invention greatly expands application of the passive NFC communication interface within the current and future several years
Range.
The present invention is communicated using the same antenna different from traditional passive NFC communication interface and energy acceptance, this hair
It is bright to be each responsible for communication using two or more antennas and received with NFC RF energies, allow to be individually for each antenna to optimize,
Radio frequency reception power is greatly improved while ensureing NFC communication performance.This device with passive NFC communication interface carries
For a large amount of electric energy, device is allowed to provide more functions, higher performance, better user experience.The present invention greatly expands
Application range of the passive NFC communication interface within the current and future several years.
Description of the drawings
Fig. 1 is the electrical structure schematic diagram of the present invention.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is explained in further detail.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, and
It is not used in the restriction present invention.
On the contrary, the present invention covers any replacement done in the spirit and scope of the present invention being defined by the claims, repaiies
Change, equivalent method and scheme.Further, in order to make the public have a better understanding the present invention, below to the thin of the present invention
It is detailed to describe some specific detail sections in section description.Part without these details for a person skilled in the art
Description can also understand the present invention completely.
As shown in Figure 1, the present invention provide it is a kind of with it is high receive power, with the passive of independent energy reception antenna
The design of NFC communication interface, the passive NFC communication interface 4 include NFC passive communications circuit and RF energy receiving circuit structure
At being each responsible for NFC passive communications and NFC RF energies and receive；The wherein described NFC passive communications circuit includes NFC communication day
Line 1, communication antenna match circuit 2, NFC transceiver 3 provide NFC passive communication functions；The RF energy receiving circuit includes
RF energy reception antenna 10, RF energy reception antenna match circuit 9, bridge rectifier 8, DC/DC 7, provide NFC radio frequency energy
Measure receive capabilities；The NFC communication antenna 1 connects NFC transceiver 3 by communication antenna match circuit 2；The NFC communication day
Line 1 receives the signal for having source interface from NFC, and sends the signal of the generation of NFC transceiver 3；The communication antenna match circuit 2
The impedance of NFC communication antenna 1 is adjusted to can be matched with NFC transceiver 3；The NFC transceiver 3 demodulates the letter from antenna
Number, and modulate the signal for issuing antenna；The RF energy reception antenna 10 is connected by RF energy reception antenna match circuit 9
Connect the input terminal of bridge rectifier 8, the input terminal of the output end connection DC/DC 7 of bridge rectifier 8；The RF energy reception antenna
10 reception NFC have the RF energy that source interface is sent；RF energy is received day by the RF energy reception antenna match circuit 9
Line 10 is tuned to the resonant frequency of 13.56Mhz, and antenna impedance is converted into OK range according to actual loading situation；Radio frequency
Energy is sent to bridge rectifier 8 after impedance converts and carries out rectification, and the DC voltage of gained is converted to appropriate electrical through DC/DC 7
Pressure is powered for passive NFC communication interface 4；The passive NFC communication interface 4 is connected by data/address bus with external device (ED) 5, outside
Part device 5 is responsible for the NFC data that the passive NFC communication interface 4 of processing receives, and provides what passive NFC communication interface 4 need to be sent
NFC data；The power supply output of the passive NFC communication interface 4 is also connected with external device (ED) 5, is used for sending nothing to external device (ED)
The energy that source NFC communication interface 4 receives.
Stand-alone antenna structure：
Different from traditional passive NFC communication interface communication and energy acceptance, passive NFC communication are carried out using the same antenna
Interface 4 uses stand-alone antenna（NFC communication antenna 1 and RF energy reception antenna 10）It is each responsible for communication and NFC RF energies
It receives.The use of the main reason for stand-alone antenna structure is that NFC passive communications circuit has antenna with RF energy receiving circuit
Completely different requirement.For NFC passive communication circuits, in order to reach necessary communication bandwidth, it is necessary to use Q values（Product
Prime factor）Lower antenna（Such as Q<20）.Quality factor are higher, and antenna selectivities are stronger, and bandwidth is also lower.On the contrary, right
For RF energy receiving circuit, in order to be lifted at the receiving efficiency and power of 13.56Mhz, it is necessary to use the very high day of Q values
Line（Such as Q>50）.The contradiction required Q values determines under the premise of ensureing communication performance, can not effectively promote receiving efficiency
With power.Therefore significantly limit the NFC RF energies that system can receive using single antenna.
Passive NFC communication interface 4 uses stand-alone antenna, and NFC communication antenna 1 and RF energy reception antenna 10 are each responsible for
Communication and energy acceptance.Due to can respectively be optimized to mutiple antennas, communication performance can be taken into account with receiving efficiency.
Passive NFC communication interface 4 can use more than two antenna according to actual conditions, to improve range of receiving.
Antenna system optimizes：
Now introduce the Optimized Measures to NFC communication antenna 1 and RF energy reception antenna 10.The purpose of optimization is to ensure
Under the premise of 1 communication performance of NFC communication antenna, the energy for connecing the reception of RF energy reception antenna 10 is improved as far as possible.
In passive NFC communication interface 4, since the energy for only having RF energy reception antenna 10 to receive can be just collected
And utilization（The energy that NFC communication antenna 1 receives finally translates into thermal energy and is lost）, in order to improve energy acceptance power, NFC
Communication antenna 1 need to reduce the energy of reception as far as possible（Only it need to meet 3 sensitivity of NFC transceiver）.NFC communication antenna 1
It one of must at least have the following properties that reduce the energy received.First, low antenna Q values（<25）.This can be by reducing antenna
Sectional area seals in the realizations such as resistance in antennas.Second, low antenna electric inductance value（<4 uH）.It can be by using the seldom day of the number of turns
Line reduces the realizations such as antenna area.Third, with transmitting antenna lower coupling.This can adjust antenna position by reducing antenna area
It sets, increases and realized at a distance from transmitting antenna.4th, not in 13.56Mhz resonance.This can be real by adjusting antenna-matching circuit 2
It is existing.
For RF energy reception antenna 10, in order to allow its reception energy as much as possible, RF energy to receive day
Line 10 need to meet four conditions with RF energy reception antenna match circuit 9.One, RF energy reception antenna 10 connects radio frequency energy
In 13.56Mhz resonance after amount reception antenna match circuit 9.In view of RF energy reception antenna match circuit 9 internal resonance electricity
The limitation for actual value of holding, the influence of parasitic capacitance and the mutual inductance with reception antenna, the inductance of RF energy reception antenna 10
Value cannot be too big, otherwise can not be in 13.56Mhz resonance.However, too low inductance value can lead to low reception power, therefore inductance
Value is proper generally between 3uH to 10uH.Two, RF energy reception antenna 10 has Q values as high as possible.Put forward high q-factor
Method includes being reduced the parasitic capacitance of antenna using the antenna with larger sectional area, being used lower antenna material of impedance etc.
Deng.Three, RF energy reception antenna 10 connects the output impedance need and load impedance after RF energy reception antenna match circuit 9
Matching ensures maximum power transfer.This can be realized by adjusting the parameter of RF energy reception antenna match circuit 9.Four, it penetrates
Frequency energy acceptance antenna 10 needs suitable area to provide the coupling enough with transmitting antenna.It is connect for typical NFC is active
The antenna size of mouth, the face of RF energy reception antenna 10 connects must be in 100mm2To 5000mm2Between.
RF energy receiving circuit designs：
RF energy receiving circuit is whole by RF energy reception antenna 10, RF energy reception antenna match circuit 9, bridge-type
It flows 8 and DC/DC 7 to form, effect is that have the RF energy that source interface is sent to be converted to directly with loss as small as possible NFC
Galvanic electricity energy.RF energy reception antenna match circuit 9 be responsible for by RF energy reception antenna 10 be tuned to 13.56Mhz resonance
Frequency, and adjusted antenna impedance to appropriate level according to actual loading.Bridge rectifier 8 is used for turning 13.56Mhz radiofrequency signals
Turn to direct current energy, DC/DC 7 is by the DC voltage voltage stabilizing.In order to reduce transition loss as possible, high speed can be used in bridge rectifier 8
Low power consumption high efficiency buck, boost or switching capacity type voltage-stablizer can be used in low pressure drop Schottky diode, DC/DC 7.
Claims (6)
1. a kind of passive NFC communication interface with independent energy reception antenna, which is characterized in that the passive NFC communication connects
The RF energy receiving circuit for mouthful including the NFC passive communications circuit for passive communication and being received for NFC RF energies；
The NFC passive communications circuit includes NFC communication antenna, communication antenna match circuit and NFC transceiver；
The NFC communication antenna is connect by communication antenna match circuit with the NFC transceiver；
The RF energy receiving circuit includes that RF energy reception antenna, RF energy reception antenna match circuit, bridge-type are whole
Stream and DC/DC；
The RF energy reception antenna connects the input of bridge rectifier, the bridge by RF energy reception antenna match circuit
The output voltage of the input of the output connection DC/DC of formula rectification, the DC/DC is that passive NFC communication interface is powered.
2. a kind of passive NFC communication interface with independent energy reception antenna according to claim 1, feature exist
In the impedance of NFC communication antenna is adjusted to by the communication antenna match circuit to match with NFC transceiver, NFC transmitting-receivings
The 13.56Mhz signals that device demodulation NFC communication antenna receives, and modulate the 13.56Mhz letters that need to be sent to NFC communication antenna
Number；
The NFC communication antenna at least has one of following property：Q values less than 20, the inductance value less than 4uH and transmitting day
The coefficient of coup of line is less than 0.2 or not in 13.56Mhz resonance.
3. a kind of passive NFC communication interface with independent energy reception antenna according to claim 1, feature exist
In, the RF energy reception antenna match circuit adjusts the resonant frequency of RF energy reception antenna to 13.56Mhz, and
The impedance of RF energy reception antenna is adjusted to OK range to improve reception power according to actual loading situation；
The inductance value of the RF energy reception antenna between 3uH-10uH, Q values in 20 or more, antenna area in 100mm2Extremely
5000mm2Between.
4. a kind of passive NFC communication interface with independent energy reception antenna according to claim 1, feature exist
In the passive NFC communication interface is connect by data/address bus and power supply output with external device (ED), and external device (ED) receives and processes
The NFC data of passive NFC communication interface, and passive NFC communication interface is provided and needs the NFC data sent.
5. a kind of passive NFC method with independent energy reception antenna, described in one of the claims 1-4
Passive NFC communication interface, which is characterized in that the communication means includes the following steps：
A NFC communication) is carried out respectively using two or more antennas and NFC RF energies receive；
B the antenna for carrying out NFC communication) is controlled to adjust, so that it is received the signal of very low energy, and received signal impedance is adjusted
Extremely it is mutually matched with NFC transceiver；
C the antenna for carrying out NFC RF energy receptions) is controlled to adjust, so that it is improved and receives power.
6. a kind of passive NFC method with independent energy reception antenna according to claim 5, feature exist
In the step B) in the day line traffic control Q values for NFC communication below 20, inductance value is in 4uH or less and transmitting antenna
The coefficient of coup be less than 0.2 or not in 13.56Mhz resonance；
The step C) in for NFC RF energies receive antenna specifically control exist：Inductance value is between 3uH-10uH, Q
Value is in 20 or more, antenna area in 100mm2To 5000mm2Between.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510568117.4A CN105099527B (en) | 2015-09-08 | 2015-09-08 | A kind of passive NFC communication interface with independent energy reception antenna |
| PCT/CN2016/080853 WO2017041496A1 (en) | 2015-09-08 | 2016-05-02 | Passive nfc communication interface having independent energy receiving antenna |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510568117.4A CN105099527B (en) | 2015-09-08 | 2015-09-08 | A kind of passive NFC communication interface with independent energy reception antenna |
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| CN105099527A CN105099527A (en) | 2015-11-25 |
| CN105099527B true CN105099527B (en) | 2018-07-20 |
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| WO (1) | WO2017041496A1 (en) |
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| CN105099527B (en) * | 2015-09-08 | 2018-07-20 | 王清斌 | A kind of passive NFC communication interface with independent energy reception antenna |
| CN105897313B (en) * | 2016-04-01 | 2019-01-15 | 王清斌 | A kind of NFC communication system and method for optimizing energy acquisition and realizing small sized antenna |
| CN105868810B (en) * | 2016-04-01 | 2019-07-16 | 王清斌 | A kind of NFC reader interface optimized for energy acquisition and small sized antenna |
| CN105897312B (en) * | 2016-04-01 | 2019-04-02 | 王清斌 | A kind of NFC label interface for energy acquisition and small size optimization |
| CN106073798A (en) * | 2016-06-01 | 2016-11-09 | 北京理工大学 | Real time health based on implanted and wearable biosensor technique monitoring system |
| JP6855989B2 (en) * | 2017-09-14 | 2021-04-07 | オムロン株式会社 | RF tag circuit |
| WO2019076366A1 (en) | 2017-10-20 | 2019-04-25 | 南京启纬智芯微电子有限公司 | Nfc interface with energy management function |
| CN109697768B (en) * | 2017-10-20 | 2024-06-21 | 杭州启纬科技有限公司 | Intelligent lock circuit and intelligent lock |
| CN109698713A (en) * | 2017-10-20 | 2019-04-30 | 南京启纬智芯微电子有限公司 | NFC interface with energy management functionality |
| CN108808890A (en) * | 2018-07-16 | 2018-11-13 | 成都瑞德星无线技术有限公司 | A kind of compact remote-wireless energy acceptance device |
| CN109586759B (en) * | 2018-12-13 | 2019-10-18 | 电子科技大学 | A kind of novel full duplex symbiosis communication system |
| CN111385776A (en) * | 2018-12-28 | 2020-07-07 | 南京启纬智芯微电子有限公司 | Energy transfer enhancement device, passive slave equipment and magnetic communication system |
| CN110890615B (en) * | 2019-10-28 | 2022-10-11 | 深圳市每开创新科技有限公司 | Passive electronic terminal and antenna module thereof |
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| WO2017041496A1 (en) | 2017-03-16 |
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