CN105574557A - Non-contact ic card system - Google Patents
Non-contact ic card system Download PDFInfo
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- CN105574557A CN105574557A CN201410544428.2A CN201410544428A CN105574557A CN 105574557 A CN105574557 A CN 105574557A CN 201410544428 A CN201410544428 A CN 201410544428A CN 105574557 A CN105574557 A CN 105574557A
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- card
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- card system
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Abstract
The invention provides a non-contact IC card system, which comprises a host, a reader-writer and an IC card, wherein the reader-writer comprises a transmitting channel and a receiving channel; the transmitting channel comprises an oscillator, a power amplifier and a tuning circuit, which are sequentially connected with one another; the receiving channel comprises a demodulator circuit, an amplification filter module and a decoder, which are sequentially connected with one another; the decoder and the oscillator are connected with a microcontroller in the reader-writer; the microcontroller is also connected with an encoder; the encoder is connected with the tuning circuit through a modulator; and the tuning circuit and the demodulator circuit are connected with an antenna coil of the reader-writer. The non-contact IC card system provided by the invention only needs to output a modulation-free carrier wave for 13.56MHz RFIDs of H4006, MCRF355/360 and the like, and can be applied to various non-contact IC cards.
Description
Technical field
The present invention relates to electronic circuit field, particularly, relate to a kind of contactless IC card system.
Background technology
Non-contact IC card is the product that radio-frequency technique and IC-card technology combine, and it successfully solves passive and contact-free problem, thus obtains a wide range of applications.ISO/IEC14443 is the international standard ［ 1 ］ of more novel contactless IC card, and this standard claims IC-card to be PICC card, and read write line is PCD.It specify TYPEA and the TYPEB two kinds of communication transmission mode between PICC and PCD, their carrier frequency is 13.56MHz.These two kinds of patterns are mainly for smart card.In fact, have lots of memory card, radio frequency identification card (RFID) is also adopt 13.56MHz as carrier frequency, but its information transmission is only from PICC to PCD.In the design of PCD, if encoding and decoding, modulation-demodulation circuit can adapt to multiple transmission mode, so PCD just has larger range of application.
Summary of the invention
For overcoming the deficiency that prior art exists, the invention discloses a kind of contactless IC card system.
Contactless IC card system of the present invention, comprise main frame, read write line and IC-card, described read write line comprises sendaisle and receiving cable, described sendaisle is by the oscillator connected successively, power amplifier and tuned circuit composition, described receiving cable is by the demodulator circuit connected successively, amplification filtering module, demoder forms, described demoder and oscillator are all connected with the microcontroller in read write line, described microcontroller is also connected with scrambler, described scrambler connects tuned circuit by modulator, described tuned circuit and demodulator circuit are all connected with the aerial coil of read write line.
Concrete, the output frequency of described oscillator is 13 to 14 megahertzes.
Preferably, described read write line is MCM200 or MCM500.
Contactless IC card system of the present invention, for the rfid card of the 13.56MHz such as H4006, MCRF355/360, only need export without modulated carrier; Can be used for the application of multiple non-contact IC card.
Accompanying drawing explanation
Fig. 1 is a kind of embodiment schematic diagram of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, to the detailed description further of the present invention's do, but embodiments of the present invention are not limited thereto.
Contactless IC card system of the present invention, comprise main frame, read write line and IC-card, described read write line comprises sendaisle and receiving cable, described sendaisle is by the oscillator connected successively, power amplifier and tuned circuit composition, described receiving cable is by the demodulator circuit connected successively, amplification filtering module, demoder forms, described demoder and oscillator are all connected with the microcontroller in read write line, described microcontroller is also connected with scrambler, described scrambler connects tuned circuit by modulator, described tuned circuit and demodulator circuit are all connected with the aerial coil of read write line.
As shown in Figure 1.System is made up of PCD and PICC.PCD is then core with microcontroller, is divided into and sends and receive two passages.Sendaisle is made up of 13.56MHz oscillator, power amplifier, tuned circuit, scrambler, modulator.Receiving cable is made up of demodulator circuit, filter amplifier, demoder.Transceiving data by microcontroller process, and can and main-machine communication.The MIFARE technology module for reading and writing MCM200/MCM500 of PHILIPS company can be adopted to realize during design PCD, MCM is the abbreviation of Mi-fareCoreModule, mean Mifare nucleus module, the protocol specification that it and MIFARE radio frequency module combine is called as ISO/IEC14443TYPEA standard.
It is in the cassette read write line of 25mm that MCM200 module is mainly used in card operating distance, and it is in the card reader of 100mm that MCM500 module is then mainly used in card operating distance.MCM has the functions such as data encryption, mistake scouting, CRC check, anti-collision.Its function realizes by software programming.The details of relevant MCM design can consult other document.
The message transmission rate that ISO/IEC14443 standard specifies is 106kbps, and data clock rate is 128 frequency divisions of carrier frequency.When transmitting data from PCD to PICC, if use TYPEA pattern, then should adopt Miller (Miller) code of correction, then can directly use NRZ(non-return-to-zero with TYPEB) code, in these two kinds codings, the Miller code more complicated of correction.
Following three kinds of sequential are defined in TYPEA:
(1) sequential X: this sequential will at 64/fc place generation " pause " (groove);
(2) sequential Y: this sequential (128/fc) during whole position is not modulated;
(3) sequential Z: during the beginning of this sequential period in place, produce " pause ".
In above-mentioned sequential illustrates, fc is the bottom width of carrier wave 13.56MHz, pause groove pulse is 0.5 ~ 3.0 μ s, and 90% Amplitude Width is not more than 4.5 μ s.Can encode to frame by these three kinds of sequential, the Miller code namely revised, wherein logical one selects sequential X; Logical zero selects sequential Y.But have except two kinds of situations, the first be adjacent have two or more " 0 " time, now should adopt sequential Z from second " 0 "; The second, when being " 0 " in the direct all positions be connected with start bit, now should represent with sequential Z.
In addition, when communication starts, represent with sequential Z.Sign off then adds sequential Y with logical zero and represents.During without information, application at least two sequential Y represent usually.
As mentioned above, the present invention can be realized preferably.
Claims (3)
1. contactless IC card system, it is characterized in that, comprise main frame, read write line and IC-card, described read write line comprises sendaisle and receiving cable, described sendaisle is by the oscillator connected successively, power amplifier and tuned circuit composition, described receiving cable is by the demodulator circuit connected successively, amplification filtering module, demoder forms, described demoder and oscillator are all connected with the microcontroller in read write line, described microcontroller is also connected with scrambler, described scrambler connects tuned circuit by modulator, described tuned circuit and demodulator circuit are all connected with the aerial coil of read write line.
2. contactless IC card system according to claim 1, is characterized in that, the output frequency of described oscillator is 13 to 14 megahertzes.
3. contactless IC card system according to claim 1, is characterized in that, described read write line is MCM200 or MCM500.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410544428.2A CN105574557A (en) | 2014-10-15 | 2014-10-15 | Non-contact ic card system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410544428.2A CN105574557A (en) | 2014-10-15 | 2014-10-15 | Non-contact ic card system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105574557A true CN105574557A (en) | 2016-05-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410544428.2A Pending CN105574557A (en) | 2014-10-15 | 2014-10-15 | Non-contact ic card system |
Country Status (1)
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| CN (1) | CN105574557A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108830360A (en) * | 2018-09-07 | 2018-11-16 | 天津光电通信技术有限公司 | Concerning security matters management method and system based on RFID |
-
2014
- 2014-10-15 CN CN201410544428.2A patent/CN105574557A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108830360A (en) * | 2018-09-07 | 2018-11-16 | 天津光电通信技术有限公司 | Concerning security matters management method and system based on RFID |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160511 |