CN102682250B - A kind of battery assist type RFID label chip signal reflex method - Google Patents
A kind of battery assist type RFID label chip signal reflex method Download PDFInfo
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- CN102682250B CN102682250B CN201110057700.0A CN201110057700A CN102682250B CN 102682250 B CN102682250 B CN 102682250B CN 201110057700 A CN201110057700 A CN 201110057700A CN 102682250 B CN102682250 B CN 102682250B
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- 230000011514 reflex Effects 0.000 title claims abstract description 9
- 230000006854 communication Effects 0.000 claims abstract description 6
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Abstract
The present invention relates to a kind of battery assist type RFID label chip signal reflex method, be characterized in: first, card reader passes through its antenna transmission carrier signal to label, for the internal information that read write tag stores.Secondly, after label receives carrier signal by its antenna, utilize frequency or Phaselocked Circuit to lock carrier signal, namely lock frequency or the phase place of carrier signal.Then, label chip is processed reading writing information by DLC (digital logic circuit), then feedback signal is outputted to modulator circuit modulates, and frequency or the phase place of the carrier signal of the frequency of modulation signal or phase place and locking have correlativity.Finally, modulation signal is launched by transmitter circuit and antenna by label, and simulated inverse scattered signal, is detected by card reader, completes communication process.Invention increases reliability and the dirigibility of label chip reflected signal.
Description
Technical field
The present invention relates to REID, the data communications method particularly between battery assist type RFID label chip and card reader.Specifically, the invention describes a kind of signal reflex method of battery assist type RFID label chip.
Background technology
RFID is a kind of automatic identification technology utilizing integrated circuit to combine with wireless communication technology and produce.Compared with the recognition technology such as conventional barcode, RFID has noncontact, scanning is fast, multiple goal identifies simultaneously, volume is little, antipollution, resistance to lasting, can reuse, security advantages of higher.Along with the fast development of IC industry, chip manufacturing cost greatly reduces, and RFID is worldwide widely used in the industries such as logistics management, production control, identification, public safety.
In frequency of operation, RFID is divided into low frequency 125KHz to 134KHz), high frequency (13.56MHz), ultrahigh frequency 860MHz to 960MHz, the several frequency range of microwave 2.45G, 5.8G.The decipherment distance of low high-frequency RF ID feels short, and read-write speed is low, but cost is little, and the design of label chip is relatively simple.The RFID of ultrahigh frequency and microwave frequency band reads distance, and be generally greater than 10m, but label chip cost is higher, design difficulty is large.The RFID of each frequency range has its relative merits, is applicable to different application scenarios.
In working method, RFID mainly can be divided into passive RFID and active RFID two kinds.Active RFID tag self is with powered battery, and reading/writing distance is comparatively far away, but volume is comparatively large, high with cost.Passive RFID tags self not charged pool, the elect magnetic field launched from card reader obtains energy, and cost is very low, less than active RFID tag, lighter, but reading/writing distance is nearer.In addition, in order to carry out the compromise of performance and cost between active RFID and passive RFID, there is battery assist type RFID.It is built-in small size battery in passive RFID tags, for label chip is powered, strengthens radio-frequency (RF) signal strength, expansion read-write scope, and can read sooner.Therefore, battery assist type RFID can obtain performance more better than passive RFID, and the cost lower than active RFID.
Summary of the invention
The invention provides a kind of battery assist type RFID label chip signal reflex method, it is characterized in that, adopt the mode of locking carrier frequency or phase place and initiatively transmitting, the passive backscattered signalling formula of simulation conventional RFID tag, realize the communication between RFID label chip and card reader, and improve reliability and the dirigibility of label chip reflected signal.
Traditional passive RFID tag chip generally adopts passive backscattered method, feedback signal is reflected back card reader, and is detected by card reader.Be illustrated in figure 1 the schematic diagram of the passive method for reflection of conventional passive RFID label chip.Label chip 101 comprises an impedance adjusting network 102 and is connected to antenna 103, and impedance adjusting network 102 is controlled by modulator 104.The input impedance of label chip 101 can be changed by control group regulating networks 102, thus the reflection coefficient changed between label chip 101 and antenna 103, whether control antenna 103 reflects the carrier signal that card reader 100 is launched, and reaches signal madulation, sends object.In design, the impedance of antenna 103 with label chip 101 input impedance under a certain modulation condition time close to mate, antenna 103 pairs of card reader 100 carrier signal of launching is approximate not to reflect.And time under another modulation condition, modulator 104 changes the input impedance of label chip 101, its reflection coefficient is increased, the carrier signal that antenna 103 pairs of card reader 100 are launched reflects.The intensity of passive reflected signal is wayward, affects effective decipherment distance.
The present invention is directed to battery assist type RFID label chip, provide a kind of novel label chip signal reflex method, for improving traditional passive method for reflection, its process is as follows:
First, card reader passes through antenna transmission carrier signal to label, for the internal information that read write tag stores.
Secondly, label reception carrier signal, utilizes frequency or Phaselocked Circuit to lock carrier signal, namely locks frequency or the phase place of carrier signal.
Then, label is processed reading writing information by DLC (digital logic circuit), then feedback signal is outputted to modulator and carry out signal madulation, and frequency or the phase place of the carrier signal of the frequency of modulation signal or phase place and locking have correlativity.
Finally, modulation signal is launched by transmitter circuit and antenna by label, and simulated inverse scattered signal, is detected by card reader.
The advantage of technical solution of the present invention is mainly reflected in: during RFID label chip work, initiatively transmit signals to card reader with the frequency relevant to carrier signal or phase place, does not need to change its input impedance reflection carrier signal.The active of label chip transmits and realizes identical information transfer capability with aforesaid passive reflected signal, can be described as with the simulated inverse scattered signal that initiatively transmits.The intensity initiatively transmitted can be controlled by transmitter circuit, improves reliability and the dirigibility of the reflected signal of label chip simulation.
Accompanying drawing explanation
Object of the present invention, advantage and disadvantage, make an explanation the non-limitative illustration by preferred embodiment below.These embodiments are only the prominent examples of application technical solution of the present invention, allly take equivalent replacement or equivalent transformation and the technical scheme that formed, all drop within the scope of protection of present invention.
Fig. 1 is the schematic diagram of the passive backscatter methods of conventional passive RFID label chip;
Fig. 2 is the schematic diagram of battery assist type RFID label chip of the present invention active launching technique.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail:
Be illustrated in figure 2 the present invention one application schematic diagram, the rfid system of example comprises card reader 200 and battery assist type RFID label tag 201.Wherein, battery assist type RFID label tag 201 is made up of label chip 202, label antenna 205 and tag battery 204.Tag battery 204 provides power supply for label chip 202.Label chip 202 mainly comprises power supply stabilization circuit 205, demodulator circuit 206, phase-locked loop circuit 207, modulator circuit 208, transmitter circuit 209, reset circuit 210, DLC (digital logic circuit) 211 and memory circuitry 212.Wherein, the frequency of label chip 202 or Phaselocked Circuit are for phase-locked loop circuit 207.
In label chip 202, power supply stabilization circuit 205 provides stable supply voltage for label chip 202.The carrier signal that demodulator circuit 206 pairs of card reader 200 are launched is carried out demodulation and is obtained read write command and data.The carrier signal that the phase-locked loop circuit 207 pairs of card reader 200 are launched carries out frequency or PGC demodulation, and provides clock signal for DLC (digital logic circuit) 211 and modulator circuit 208.The feedback signal of modulator circuit 208 pairs of label chips 202 is modulated.The modulation signal that modulator circuit 208 exports by transmitter circuit 209 is launched by label antenna 203, the back-scattered signal of simulation label chip 202.Reset circuit 210 provides reset signal for DLC (digital logic circuit) 211, makes digital circuit proper reset, to respond the instruction of card reader 200.DLC (digital logic circuit) 211 is logic control and the signal processing unit of label chip 202.The internal information of memory circuitry 212 storage tags chip 202, can be read and write by card reader 200.
When the rfid system of example carries out work, card reader 200 needs to carry out read-write operation to battery assist type RFID label tag 201.Transmitter 213 now in card reader 200 is emitted through modulation or the carrier signal without modulation by card reader antenna 214, i.e. tag read signal.
Battery assist type RFID label tag 201, outside certain distance, receives the carrier signal of card reader 200 transmitting by label antenna 203, and it is inner carrier signal to be sent to label chip 202.On the one hand, the 206 pairs of carrier signals of the demodulator circuit in label chip 202 carry out demodulation, recover read write command and the data of card reader 200, and read write command and data are outputted to DLC (digital logic circuit) 211 process.On the other hand, the 207 pairs of carrier signals of the phase-locked loop circuit in label chip 202 are followed the tracks of, the frequency of locking carrier signal or phase place.Phase-locked loop circuit 207 produces the clock signal relevant to the frequency of carrier signal or phase place simultaneously, to work required clock signal as DLC (digital logic circuit) 211 and modulator circuit 208.
DLC (digital logic circuit) 211 is receiving clock signal and after the reset signal that the circuit 210 that is reset produces resets, is processing the read write command of card reader 200 and data.DLC (digital logic circuit) 211 can carry out read-write operation to memory circuitry 212 according to read write command, reads the data message stored in memory circuitry 212, or write data message in memory circuitry 212.DLC (digital logic circuit) 211, after completing the read write command of card reader 200 and data processing, obtains the data message that label chip 202 feeds back to card reader 200, and feedback signal is exported to modulator circuit 208.
The feedback signal that modulator circuit 208 pairs of DLC (digital logic circuit) 211 export is modulated, as adopted ASK modulation, or some other modulation system, and the feedback signal after modulation is exported to transmitter circuit 209.Modulator circuit 208 adopts the clock signal with frequency that is carrier signal or phase place with certain locking relation that is that produced by phase-locked loop circuit 207 to modulate, therefore, the frequency of the carrier signal that the frequency of modulation signal or phase place and card reader 200 are launched or phase place have certain locking relation, i.e. correlativity.
Transmitter circuit 209 adopts the mode of initiatively launching, and the modulation signal exported by modulator circuit 208 is launched by label antenna 203.The feedback signal that the signal that transmitter circuit 209 is launched reflects for simulating label chip 202, the frequency of the carrier signal that its frequency or phase place and card reader 200 are launched or phase place have certain locking relation, can be detected in some way by card reader 200.
Card reader 200 receives the reflected signal of label chip 202 by card reader antenna 214, the signal that namely in label chip 202, transmitter circuit 209 is launched, and is detected by the receiver 215 in card reader 200, obtains the feedback data information of label chip 202.
Can be found out by above-mentioned character express, after adopting the present invention, promote radio-frequency (RF) signal strength of knowing clearly, expansion read-write scope.Meanwhile, the cost of communication is reduced.During RFID label chip work, initiatively transmit signals to card reader with the frequency relevant to carrier signal or phase place, do not need to change its input impedance reflection carrier signal.The active of label chip transmits and realizes identical information transfer capability with aforesaid passive reflected signal, can be described as with the simulated inverse scattered signal that initiatively transmits.The intensity initiatively transmitted can be controlled by transmitter circuit, improves reliability and the dirigibility of the reflected signal of label chip simulation.
Claims (3)
1. a battery assist type RFID label chip signal reflex method, is characterized in that: first, and card reader passes through antenna transmission carrier signal to label, for the internal information that read write tag stores, secondly, label reception carrier signal, utilizes frequency or Phaselocked Circuit to lock carrier signal, namely locks frequency or the phase place of carrier signal, then, label is processed reading writing information by DLC (digital logic circuit), then feedback signal is outputted to modulator and carry out signal madulation, and frequency or the phase place of the carrier signal of the frequency of modulation signal or phase place and locking have correlativity, finally, modulation signal is launched by transmitter circuit and antenna by label, and simulated inverse scattered signal, is detected by card reader, the carrier signal that card reader is launched is modulation signal, or unmodulated signal, RFID label chip adopts the method for locking carrier frequency or phase place and initiatively transmitting to simulate passive backscattered method, realize the communication between RFID label chip and card reader, RFID label chip first locks frequency or the phase place of the carrier signal that card reader is launched, again by label antenna by feedback signal there is the frequency of correlativity with carrier signal or phase place launches back card reader, the back-scattered signal of simulation label chip, and detected in some way by card reader, RFID label chip also comprises, power supply stabilization circuit, demodulator circuit, modulator circuit, reset circuit, DLC (digital logic circuit) and memory circuitry or other interlock circuits.
2. a kind of battery assist type RFID label chip signal reflex method according to claim 1, is characterized in that: RFID label chip comprises a frequency or Phaselocked Circuit, carries out frequency or PGC demodulation to the carrier signal that card reader is launched; This frequency or Phaselocked Circuit can be phase-locked loop circuits, or delay locked-loop circuit, or divider circuit, or other forms of frequency or Phaselocked Circuit.
3. a kind of battery assist type RFID label chip signal reflex method according to claim 1, is characterized in that: RFID label chip also comprises a transmitter circuit, utilizes transmitter circuit that the feedback signal after modulation is initiatively launched back card reader; The frequency of the carrier signal that the frequency that transmitter circuit transmits or phase place and card reader are launched or phase place have correlativity.
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Families Citing this family (5)
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| CN105005751B (en) * | 2015-08-12 | 2017-09-22 | 苏州芯动科技有限公司 | A kind of RFID label chip signal reflex method |
| CN105631380A (en) * | 2015-12-22 | 2016-06-01 | 上海爱信诺航芯电子科技有限公司 | Magnetic stripe card data decoding circuit and decoding method thereof |
| CN105678203B (en) * | 2015-12-31 | 2019-03-01 | 广州中大微电子有限公司 | A kind of production method and system suitable for RFID reader sampling clock |
| CN106941363B (en) * | 2017-01-23 | 2019-09-10 | 天地融科技股份有限公司 | Card reading response method, apparatus and system |
| CN109120311B (en) * | 2018-07-30 | 2021-10-26 | 太原理工大学 | Passive wireless communication system based on environment backscattering |
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