CN201255885Y - Non-contact radio frequency card reader - Google Patents
Non-contact radio frequency card reader Download PDFInfo
- Publication number
- CN201255885Y CN201255885Y CNU2008201585718U CN200820158571U CN201255885Y CN 201255885 Y CN201255885 Y CN 201255885Y CN U2008201585718 U CNU2008201585718 U CN U2008201585718U CN 200820158571 U CN200820158571 U CN 200820158571U CN 201255885 Y CN201255885 Y CN 201255885Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- card reader
- resonant circuit
- antenna
- fm1702sl
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Abstract
The utility model discloses a non-contact radio frequency card reader, which comprises a microcontroller MCU, a non-contact card reader chip FM1702SL, an amplifying circuit, a first resonant circuit, a second resonant circuit and a rectifying circuit, wherein the MCU adopts the SPI communication interface to control the non-contact card reader chip FM1702SL, the sixth pin TX2 of the chip continuously output carrier wave signals to be amplified by the amplifying circuit to be serially coupled with the first LC resonant circuit and the second LC resonant circuit which can filter high harmonic waves and amplify signals resonantly, the second LC resonant circuit adopts an antenna as inductance, the data received by the antenna is coupled to a rectifying filter circuit, the rectified waveform is coupled to the RX pin of the FM1702SL. The non-contact radio frequency card reader has less periphery circuit, simple circuit, high stability, low power consumption, simple manufacture and debugging, while the card read distance can reach 10cm, for matching different radio frequency identification application systems.
Description
Technical field
The utility model relates to a kind of card reader, relates in particular to a kind of non-contact radio-frequency card reader.
Background technology
Progress and development along with electronic technology, radio-frequency card and Non-contact Media Reader thereof are progressively replacing photoelectric card, magnetic card, contact IC-card and card reader thereof are because the present still a kind of new technology of contactless Card Reader technology, there are a lot of aspects to be still waiting to improve, circuit such as present non-contact radio-frequency card reader is complicated,, maximum Card Reader distance is shorter, stability is not good enough etc., and these problems all are scientific and technical personnel's problem demanding prompt solutions.
The utility model content
The utility model content
The purpose of this utility model is to provide a kind of circuit simple, good stability non-contact radio-frequency card reader.
This non-contact radio-frequency card reader that the utility model provides comprises microcontroller MCU, noncontact device card reader chip FM1702SL, amplifying circuit, the one-level resonant circuit, the secondary resonant circuit, shaping circuit, MCU is by SPI communication interface control noncontact device card reader chip FM1702SL, the continuous outgoing carrier signal of this chip the 6th pin TX2, by being coupled to one-level LC resonant circuit and the secondary LC resonant circuit that is used for the filtering higher hamonic wave and signal resonance is amplified in turn after the amplifying circuit amplification, wherein the inductance in the secondary LC resonant circuit is an antenna, the data that antenna receives are coupled to plastic filter circuit, and the waveform after the shaping is coupled to the RX pin of FM1702SL again.
The less circuit of the utility model peripheral component is simple, good stability is low in energy consumption, make also comparatively simply and because it has adopted noncontact device card reader chip FM1702SL with debugging, this chip only needs MCU to send order by the SPI interface just can finish operation to card.Card Reader distance of the present utility model can reach 10cm, can conveniently be applied to various radio frequency identification application system. as attendance checking system, gate control system, bus Fare Collection System, and various water, electricity, gas table charge systems etc.
Description of drawings
Fig. 1 is a block scheme of the present utility model.
Fig. 2 is a circuit diagram of the present utility model.
Embodiment
From Fig. 1 and Fig. 2 as can be seen the utility model mainly form by MCU, FM1702SL, amplifying circuit, resonant circuit, antenna, shaping circuit, wherein microcontroller MCU controls FM1702SL by SPI communication interface firing order, the carrier signal of constantly being exported 13.56M by FM1702SL the 6th pin TX2 is coupled to Q1 through C26, signal after Q1 amplifies is coupled to first order LC resonant circuit by C21, this grade LC resonant circuit is made up of L1 and C30, C33, and it mainly acts on is the filtering higher hamonic wave and signal resonance amplified.Be coupled to second level LC resonant circuit through this one-level amplifying signal through C22 and C25.Second level LC resonant circuit is made up of antenna and C31, C32, make their resonance on the 13.56M frequency by adjusting C31, C32 capacitance size, resonance through the secondary resonant circuit amplifies, and has enough energy transmitting radio magnetic wave to the outside this moment on antenna.When radio-frequency card enters within the antenna working range of this card reader, owing in the radio-frequency card LC series resonant circuit is arranged, its frequency is identical with the frequency of radio-frequency module emission, under electromagnetic excitation, the LC resonant circuit produces resonance, thereby make electric charge has been arranged in the electric capacity, the other end at this electric capacity, be connected to the electronic pump of a unidirectional conducting, electric charge in the electric capacity delivered in another electric capacity store, when the electric charge that is accumulated reached 2V, this electric capacity can provide operating voltage for other circuit as power supply, and interior data transmission is gone out or the data of receiver module with blocking.The data that antenna receives are coupled to the plastic filter circuit that D3, D5, C9 and R12 form through C7, and the waveform of shaping goes data through the inner decoding demodulation, thereby finishes the read-write operation to radio-frequency card through the RX pin that C2 is coupled to FM1702SL.
FM1702SL is the general non-contact card card reader chip of Shanghai Fudan Microelectronics Co., Ltd based on the ISO14443 standard design, and what this chip adopted is 0.6 micrometre CMOS EEPROM technology manufacturing. can support the cryptographic algorithm of ISO14443typeA agreement and MIFARE standard.Chip internal is integrated analog-modulated demodulator circuit.Thereby only need overlap minimum peripheral circuit and just can work.The FM1702SL chip is supported the SPI interface, and its digital circuit has two kinds of voltage operation modes of TTL, CMOS.Be specially adapted to the application of the card reader of charge systems such as the substandard water of ISO14443, electricity, gas meter.The minimum operating voltage of the three-way power of this chip all can reach 2.9V, and this characteristic is better than other company's like product.
Antenna of the present utility model adopts any one in the little loop antenna, and as square, circle, ellipse, triangular form etc., what present embodiment adopted is the little loop antenna of square.The biggest size of element of antenna is commonly defined as with the boundary of neither one strictness between the operation wavelength:
L/λ≤1/(2π) (1)
In the formula (1), L is the full-size of antenna, and λ is an operation wavelength.For the system of 13.6MHz, the full-size of antenna is about 50cm.
In Antenna Design, quality factor q is a very important parameter.For inductive coupling formula radio-frequency module antenna, the value of higher figure of merit can make in the aerial coil strength of current more greatly, can improve thus to the card delivering power.The computing formula of quality factor is:
F0 in the formula (2) is a frequency of operation, and Lcoil is the size of antenna, and Rcoil is the radius of antenna.Can be easy to calculate the bandwidth of antenna by quality factor:
B＝f0/Q (3)
From formula (3) as can be seen, the transmission bandwidth of antenna and the quality factor relation of being inversely proportional to.Therefore, too high quality factor can cause bandwidth to be dwindled.Thereby weaken the modulation sideband, of PCD, can cause PCD can't with cartoon letters.Its factor best in quality of the antenna that the utility model adopts is 10～30, and maximal value can not surpass 60.
Claims (2)
1, a kind of non-contact radio-frequency card reader, it is characterized in that this card reader comprises microcontroller MCU, noncontact device card reader chip FM1702SL, amplifying circuit, the one-level resonant circuit, the secondary resonant circuit, shaping circuit, MCU is by SPI communication interface control noncontact device card reader chip FM1702SL, the continuous outgoing carrier signal of this chip the 6th pin TX2, by being coupled to one-level LC resonant circuit and the secondary LC resonant circuit that is used for the filtering higher hamonic wave and signal resonance is amplified in turn after the amplifying circuit amplification, wherein the inductance in the secondary LC resonant circuit is an antenna, the radio-frequency card data that this antenna receives are coupled to plastic filter circuit, and the waveform after the shaping is coupled to the RX pin of FM1702SL again.
2, non-contact radio-frequency card reader according to claim 1 is characterized in that described antenna adopts little loop antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201585718U CN201255885Y (en) | 2008-09-25 | 2008-09-25 | Non-contact radio frequency card reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201585718U CN201255885Y (en) | 2008-09-25 | 2008-09-25 | Non-contact radio frequency card reader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201255885Y true CN201255885Y (en) | 2009-06-10 |
Family
ID=40739211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201585718U Expired - Lifetime CN201255885Y (en) | 2008-09-25 | 2008-09-25 | Non-contact radio frequency card reader |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201255885Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011140731A1 (en) * | 2010-05-10 | 2011-11-17 | 国民技术股份有限公司 | Device, system and method for low-frequency magnetic field signal detecting, transmission and distance estimating |
-
2008
- 2008-09-25 CN CNU2008201585718U patent/CN201255885Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011140731A1 (en) * | 2010-05-10 | 2011-11-17 | 国民技术股份有限公司 | Device, system and method for low-frequency magnetic field signal detecting, transmission and distance estimating |
| CN103023536A (en) * | 2010-05-10 | 2013-04-03 | 国民技术股份有限公司 | Device, system and method used for detecting and transmitting low-frequency magnetic field signal and judging distance |
| CN103023536B (en) * | 2010-05-10 | 2014-12-03 | 国民技术股份有限公司 | Device, system and method used for detecting and transmitting low-frequency magnetic field signal and judging distance |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201156257Y (en) | Data reading circuit for low frequency radio frequency IC card suitable for low voltage and corresponding apparatus | |
| CN203084751U (en) | RFID mobile communication terminal | |
| EP3968210A1 (en) | Rfid tag information reading device and method | |
| CN101937519A (en) | Wirelessly chargeable RFID electronic tag | |
| CN201716739U (en) | Small ultra-high frequency integral RFID reader | |
| CN110598497A (en) | Long-distance passive wireless magnetic field quantity sensing label | |
| CN106682554A (en) | Non-contact IC card reader and implementation method thereof | |
| CN201429849Y (en) | Radio frequency identification reader-writer | |
| CN201255885Y (en) | Non-contact radio frequency card reader | |
| CN202167040U (en) | Radio-frequency card read-write apparatus | |
| CN203149603U (en) | Identification reader-writer for T5557 radio frequency cards | |
| CN201741174U (en) | RFID electronic tag capable of being charged wirelessly | |
| WO2017166364A1 (en) | Nfc reader-writer interface for optimizing energy acquisition and small-size antenna | |
| CN101859362B (en) | Device and method for reading/writing memory card in radio frequency non-contact way | |
| CN102364493B (en) | Novel high-frequency communication protocol monitoring circuit | |
| CN103870865B (en) | Radio circuit for non-contact IC card | |
| CN109962723A (en) | A kind of modulation circuit of band automatic adjustment load resistance | |
| CN201887759U (en) | Variable-direction passive radio-frequency signal transceiver | |
| CN201607752U (en) | Device for reading and writing memory card via radio frequency in non-contact manner | |
| CN201514639U (en) | Non-contact card reader capable of enhancing access distance | |
| CN202662047U (en) | Large-power RFID (Radio Frequency Identification) antenna using ISO14443TYPE A protocol | |
| CN208506765U (en) | Automatic tuning contactless smart card resonance circuit | |
| CN202584154U (en) | Radio frequency device integrating 13.56M and 2.4G cards | |
| CN219105496U (en) | System integration equipment based on non-contact IC card | |
| CN219958248U (en) | UHF RFID smart card capable of being recognized remotely |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHINA ELECTRIC HUNAN WEIKE ELECTRIC POWER METER CO Free format text: FORMER NAME: HUNAN WEIKE ELECTRIC POWER METER CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: Block M14, building B, hi tech Industrial Development Zone, silver basin South Road, Hunan, Changsha, 410013 Patentee after: Hunan Zhongdian Weike Electric Meter Co., Ltd. Address before: 352, Jia Jia Hu Road, Tongzi hi tech Industrial Development Zone, Changsha, Hunan Province, China: 410013 Patentee before: Hunan Weike Power Meter Co., Ltd. |
|
| C56 | Change in the name or address of the patentee |
Owner name: HUNAN WILLFAR INFORMATION TECHNOLOGY CO., LTD. Free format text: FORMER NAME: HUNAN ZHONGDIAN WEIKE ELECTRIC METER CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 410013. B building, M14 building, hi tech Industrial Development Zone, silver basin South Road, Hunan, Changsha Patentee after: Hunan Weike Power Meter Co., Ltd. Address before: 410013. B building, M14 building, hi tech Industrial Development Zone, silver basin South Road, Hunan, Changsha Patentee before: Hunan Zhongdian Weike Electric Meter Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090610 |