CN203149589U - Label circuit of low-power-consumption radio frequency identification system - Google Patents
Label circuit of low-power-consumption radio frequency identification system Download PDFInfo
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- CN203149589U CN203149589U CN 201320114982 CN201320114982U CN203149589U CN 203149589 U CN203149589 U CN 203149589U CN 201320114982 CN201320114982 CN 201320114982 CN 201320114982 U CN201320114982 U CN 201320114982U CN 203149589 U CN203149589 U CN 203149589U
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Abstract
The utility model provides a label circuit of a low-power-consumption radio frequency identification system. The label circuit comprises a power supply recovery circuit used for making a direct current voltage recovered from an electromagnetic field; a demodulation circuit used for converting radio frequency signals sent to a label by an RFID card reader into digital baseband signals; a modulation circuit for achieving reverse scattering modulation by changing the input impedance of the label; and a digital circuit used for processing the digital baseband signals, performing instruction decoding and sending information stored by the label back to the RFID card reader. The power supply recovery circuit is connected with the demodulation circuit, the modulation circuit and the digital circuit. The demodulation circuit is connected with the digital circuit and the modulation circuit. By optimizing the circuit structure, the label circuit of the low-power-consumption radio frequency identification system has the power consumption lowered. Meanwhile, the working dynamic range of the label circuit is enlarged.
Description
Technical field
The utility model belongs to field of radio frequency identification, is specifically related to a kind of tag circuit of low-power consumption radio-frequency recognition system.
Background technology
Internet of Things is by information sensing equipment such as radio-frequency (RF) identification (RFID), infrared inductor, GPS, laser scanners, agreement by agreement, any article and internet are coupled together, carry out message exchange and communication, to realize a kind of network of intelligent identification, location, tracking, monitoring and management.Internet of Things is on the basis of computer internet, utilizes technology such as RFID, wireless data communications, constructs one and covers " InternetofThings " of all things in the world.In this network, article (commodity) can carry out " interchange " each other, and need not people's intervention.Its essence is radio frequency automatic identification (RFID) technology of utilizing, realize the interconnected of the automatic identification of article (commodity) and information and share by computer internet.
Very important technology is radio-frequency (RF) identification (RFID) technology in the Internet of Things.RFID is that radio-frequency (RF) identification (RadioFrequencyIdentification) is identified destination object automatically and obtained related data by radiofrequency signal.Identification work need not manual intervention, can work in various rugged surroundings.High-speed moving object can be identified and a plurality of labels can be identified simultaneously, swift and convenient to operate.It has three basic devices, label (tag), reader (reader), antenna (antenna).Label (Tag): be made up of coupling element and chip, each label has unique electronic code, is attached to and identifies destination object on the object.Reader (Reader): read the equipment of (can also write sometimes) label information, can be designed to hand-held or fixed.Antenna (Antenna): between label and reader, transmit radiofrequency signal.The power consumption that how to reduce the tag circuit of radio-frequency recognition system is hot research in recent years always.
The utility model content
The utility model provides a kind of tag circuit that can reduce the low-power consumption radio-frequency recognition system of chip power-consumption at above-mentioned the deficiencies in the prior art.
The utility model is achieved by the following technical solution:
A kind of tag circuit of low-power consumption radio-frequency recognition system comprises:
The power up circuit is used for recovering DC voltage from electromagnetic field;
Demodulator circuit is converted into digital baseband signal for the radiofrequency signal that the RFID card reader is sent to label;
Modulation circuit is used for realizing backscattered modulation by the input impedance that changes label;
Digital circuit for the treatment of digital baseband signal, is instructed decoding, and returns label institute canned data to the RFID card reader;
The power up circuit all links to each other with demodulator circuit, modulation circuit and digital circuit, and demodulator circuit all links to each other with modulation circuit with digital circuit.
Further setting of the present utility model is that described tag circuit comprises that also one is used to digital circuit that the clock circuit of clock signal is provided.
Further setting of the present utility model is that described tag circuit comprises that also one is used for producing the reset circuit of reset signal when supply voltage rises to work range.
Further setting of the present utility model is that described power up circuit adopts nine grades of Dickson multiplication of voltage charge pump circuits.
The tag circuit of low-power consumption radio-frequency recognition system described in the utility model has reduced the power consumption of tag circuit really by circuit structure is optimized, and has enlarged the trend of work scope of tag circuit.
Description of drawings
Fig. 1 is the structured flowchart of the tag circuit of low-power consumption radio-frequency recognition system described in the utility model;
Fig. 2 is the schematic diagram of power up circuit.
Embodiment
The utility model is described in more detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the utility model provides a kind of tag circuit of low-power consumption radio-frequency recognition system, comprising: the power up circuit is used for recovering DC voltage from electromagnetic field; Demodulator circuit is converted into digital baseband signal for the radiofrequency signal that the RFID card reader is sent to label; Modulation circuit is used for realizing backscattered modulation by the input impedance that changes label; Digital circuit for the treatment of digital baseband signal, is instructed decoding, and returns label institute canned data to the RFID card reader; The power up circuit all links to each other with demodulator circuit, modulation circuit and digital circuit, and demodulator circuit all links to each other with modulation circuit with digital circuit.
Described tag circuit comprises that also one is used to digital circuit that the clock circuit of clock signal is provided, and a reset circuit that is used for producing reset signal when supply voltage rises to work range.
The schematic diagram of described power up circuit as shown in Figure 2.When label from card reader away from the time, the radiofrequency signal that label receives is very faint, has only the hundreds of millivolt.In order to obtain rational operating voltage down remote, the power up circuit has adopted the form of nine grades of Dickson multiplication of voltage charge pump circuits.When chip was positioned at the diverse location of card reader place, the power input variation range of radiofrequency signal was very big.For guaranteeing that label has bigger working range, need under the situation near field, use mu balanced circuit to reduce label input impedance, reduce the power of the actual acquisition of label, simultaneously the supply voltage that recovers is limited in the reasonable range.Mu balanced circuit is made of the M1 among Fig. 2, D1, D2, D3 and R1.When supply voltage rose to the threshold voltage that surpasses 3 diodes, the pressure drop on the resistance R 1 began to increase, and made leak-off pipe M1 conducting, and the big electric current of releasing is to reduce label input impedance.Simulation result shows that when supply voltage was 116V, the quiescent current of mu balanced circuit consumption was 230nA; When radiofrequency signal power input during less than 715mW, supply voltage is less than 2135V.
Above-mentioned each circuit all can adopt prior art to realize, repeats no more in the utility model.The above is preferred embodiment of the present utility model, and all equivalent variations of doing according to the utility model claim all should belong to protection domain of the present utility model.
Claims (4)
1. the tag circuit of a low-power consumption radio-frequency recognition system is characterized in that, comprising:
The power up circuit is used for recovering DC voltage from electromagnetic field;
Demodulator circuit is converted into digital baseband signal for the radiofrequency signal that the RFID card reader is sent to label;
Modulation circuit is used for realizing backscattered modulation by the input impedance that changes label;
Digital circuit for the treatment of digital baseband signal, is instructed decoding, and returns label institute canned data to the RFID card reader;
The power up circuit all links to each other with demodulator circuit, modulation circuit and digital circuit, and demodulator circuit all links to each other with modulation circuit with digital circuit.
2. the tag circuit of low-power consumption radio-frequency recognition system according to claim 1 is characterized in that, described tag circuit comprises that also one is used to digital circuit that the clock circuit of clock signal is provided.
3. the tag circuit of low-power consumption radio-frequency recognition system according to claim 2 is characterized in that, described tag circuit comprises that also one is used for producing the reset circuit of reset signal when supply voltage rises to work range.
4. the tag circuit of low-power consumption radio-frequency recognition system according to claim 1 is characterized in that, described power up circuit adopts nine grades of Dickson multiplication of voltage charge pump circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320114982 CN203149589U (en) | 2013-03-13 | 2013-03-13 | Label circuit of low-power-consumption radio frequency identification system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320114982 CN203149589U (en) | 2013-03-13 | 2013-03-13 | Label circuit of low-power-consumption radio frequency identification system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203149589U true CN203149589U (en) | 2013-08-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320114982 Expired - Fee Related CN203149589U (en) | 2013-03-13 | 2013-03-13 | Label circuit of low-power-consumption radio frequency identification system |
Country Status (1)
| Country | Link |
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| CN (1) | CN203149589U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110147694A (en) * | 2019-06-15 | 2019-08-20 | 吴新胜 | A kind of RF front-end circuit and radio frequency tag circuit |
-
2013
- 2013-03-13 CN CN 201320114982 patent/CN203149589U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110147694A (en) * | 2019-06-15 | 2019-08-20 | 吴新胜 | A kind of RF front-end circuit and radio frequency tag circuit |
| CN110147694B (en) * | 2019-06-15 | 2022-04-26 | 上海航空印刷有限公司 | Radio frequency front-end circuit and radio frequency tag circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130821 Termination date: 20170313 |
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| CF01 | Termination of patent right due to non-payment of annual fee |