CN201156257Y - Data reading circuit for low frequency radio frequency IC card suitable for low voltage and corresponding apparatus - Google Patents
Data reading circuit for low frequency radio frequency IC card suitable for low voltage and corresponding apparatus Download PDFInfo
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- CN201156257Y CN201156257Y CNU2008201014425U CN200820101442U CN201156257Y CN 201156257 Y CN201156257 Y CN 201156257Y CN U2008201014425 U CNU2008201014425 U CN U2008201014425U CN 200820101442 U CN200820101442 U CN 200820101442U CN 201156257 Y CN201156257 Y CN 201156257Y
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Abstract
The utility model relates to the IC card data reading field, in particular to a low frequency radio-frequency IC card data reading circuit and a corresponding device. The corresponding device consists of a singlechip, an ASK modulating circuit, an LC harmonic loop, a diode envelope detection circuit, a band pass filter circuit and a shaping and amplifying circuit which are connected orderly. The output of the shaping and amplifying circuit is connected with the singlechip, thereby forming a modulating circuit, a harmonic loop diode envelope detection circuit, the band pass filter circuit, a shaped and amplified device component and a base circuit consisting of a resistor, a capacitor, a diode, an audion and an inductor. The value range of inductance L1 in the circuit is between 400 and 600microhenry, the value range of the capacitance C1 is between 3000 and 4000picofarad, wherein, the value ranges of L1 and the capacitance C1 ensure that the harmonic frequency is 125kilohertz approximately; the value range of the resistance R3 is between 6.8kilohm and 15kilohm; the value range of the capacitance C4 is between 1000 and 3300picofarad. A low frequency radio-frequency IC card data reading device can work normally under the condition of 3V power supply, thereby enlarging the power supply application range of the low frequency radio-frequency IC card data reading device.
Description
Technical field
The utility model relates to IC-card data read field, is specifically related to a kind of data reading circuit and related device thereof of low frequency radio frequency IC-card.
Background technology
Radio-frequency (RF) IC card claims contactless IC card again, integrated IC-card circuit and micropower wireless transceiver circuit in little plastic cards, and by this wireless transceiver circuit, radio-frequency (RF) IC card can be carried out data communication with corresponding read-write equipment.Because radio-frequency (RF) IC card has noncontact, does not have advantages such as wearing and tearing, waterproof and dustproof, so be widely used in occasions such as electronic ticket, electron key, electronic ID card.
A LC resonant circuit is arranged, the frequency of its frequency and read write line emission identical (frequency of operation of present widely used low frequency radio frequency IC-card mainly contains two kinds of 125kHz and 134.2kHz) in the radio-frequency (RF) IC card.When radio-frequency card under electromagnetic excitation, the LC resonant circuit produces resonance, is other circuit supply in the card thereby obtain energy as power supply, will card in data transmission go out or read the data of read write line.After read write line receives the data of card, decode and carry out the validity that error-checking decides data, identify corresponding data then.
The radio-frequency (RF) IC card data fetch device is an indispensable part in the application of radio-frequency (RF) IC card.In actual use, the design of radio-frequency (RF) IC card data reading circuit is a more complicated, substantially all is to adopt the special chip such as the U2270B of atmel corp to realize, requires power supply during this chip operation more than 5V.In a lot of hand-held card-reading apparatus, generally all be two joint dry cells (3V), three joint dry cells (4.5V) or lithium battery (3.6V) power supply, limited the usable range of many chips, the system that makes need increase extra power-switching circuit and guarantee system works, increase the complexity of system, reduced the reliability of system.Therefore, how to make that the Card Reader circuit is fairly simple, to adapt to than low supply voltage be the emphasis and the difficult point of correlation engineering personnel research always.
Summary of the invention
For overcoming above-mentioned shortcoming, satisfy the needs that this part increases day by day, one of the purpose of this utility model provides a kind of general-purpose chip that utilizes, and constitutes low frequency radio frequency IC-card data fetch device.This device adopts single-chip microcomputer to produce carrier and modulating signal, ASK modulation circuit by the Sheffer stroke gate design, the LC resonant tank works in resonant condition and provides energy to radio-frequency (RF) IC card, LC resonant tank while and radio-frequency (RF) IC card swap data, through the diode envelope detection circuit, and utilize a Sheffer stroke gate chip etc. to form a bandpass filter and a shaping amplification circuit.The radio-frequency (RF) IC card data reading circuit can be worked under the low pressure of 3V, and circuit is simple, and stability is high, has also reduced cost simultaneously.
The technical scheme that its technical matters that solves the utility model adopts is: low frequency radio frequency IC-card data reading circuit is by the low-voltage single-chip microcomputer, the LC resonant tank, the diode envelope detection, and constitute and be linked in sequence by bandpass filtering, shaping amplification circuit that Sheffer stroke gate is formed, the output of shaping amplification circuit connects tieback to single-chip microcomputer again, constitutes modulation circuit, resonant tank diode envelope detection circuit, bandwidth-limited circuit, the device feature of shaping amplification and the tandem circuit that is made of jointly resistance, electric capacity, diode, triode and inductance thereof thus.Wherein, single-chip microcomputer produces carrier wave, is connected to LC resonant tank (resonance frequency is the frequency of operation of radio-frequency (RF) IC card); The output of LC resonant tank is connected to diode envelope detection circuit (filtering carrier signal, obtain envelope signal), be connected to bandpass filtering and shaping amplification module that the Sheffer stroke gate chip is formed, thereby obtain undistorted, steady I C card data and deliver to single-chip microcomputer identification, decode the radio-frequency (RF) IC card data by single-chip microcomputer.
Two of the purpose of this utility model provides a kind of tandem circuit that constitutes low frequency radio frequency IC-card data fetch device.In the circuit, single-chip microcomputer adopts PIC16LF873A, its 21 pin is connected to the input pin of a Sheffer stroke gate U1A, 22 pin of single-chip microcomputer are connected to another input pin of U1, the output terminal of Sheffer stroke gate U1A links to each other with the base stage of NPN triode Q1, PNP triode Q2, the collector of NPN triode Q1 connects power supply, and emitter links to each other the grounded collector of PNP triode Q2 with emitter, the inductance L 1 of Q2; The other end of L1 links to each other with the positive pole of diode D1, connects a capacitor C 1 simultaneously to ground; The negative pole of diode D1 links to each other with capacitor C 3, connects a capacitor C 2 simultaneously and a resistance R was clipped to ground in 1 minute; The input end of the other end Sheffer stroke gate U1B of capacitor C 3 links to each other with R2, another input termination power of U1B; The output terminal of U1B links to each other with the other end of resistance R 2, links to each other with an end of resistance R 3 simultaneously; The other end of resistance R 3 links to each other with the input end of U1C, connects a capacitor C 4 simultaneously to ground; The output terminal of U1C is the output terminal of demodulation waveforms, and this pin is connected to 23 pin of single-chip microcomputer.In this circuit, the span of inductance L 1 is 400～600uH, and the span of capacitor C 1 is 3000～4000pF, and wherein L1, capacitor C 1 value make that its resonance frequency is about 125KHz; The span of resistance R 3 is 6.8k～15k, and the span of capacitor C 4 is 1000～3300pF.
The beneficial effects of the utility model are, make that low frequency radio frequency IC-card data fetch device also can operate as normal under the situation of 3V power supply, have enlarged the power supply accommodation of low frequency radio frequency IC-card data fetch device.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is a low frequency radio frequency IC-card data fetch device system chart described in the utility model.
Fig. 2 is the schematic diagram of an embodiment of the utility model.
In Fig. 1,1. single-chip microcomputer; 2.ASK modulation circuit; 3.LC resonant circuit; 4. diode envelope detection circuit; 5. bandwidth-limited circuit 6. shaping amplification circuits.
Embodiment
Low frequency radio frequency IC-card data fetch device system chart as shown in Figure 1 carries out conventional connection according to the mode described in the figure, constructs low frequency radio frequency IC-card data fetch device, and wherein the tandem circuit part is carried out according to the serial connection mode described in Fig. 2.Single-chip microcomputer adopts PIC16LF873A in the circuit, its 21 pin is connected to the input pin of a Sheffer stroke gate U1A, 22 pin of single-chip microcomputer are connected to another input pin of U1, the output terminal of Sheffer stroke gate U1A links to each other with the base stage of NPN triode Q1, PNP triode Q2, the collector of NPN triode Q1 connects power supply, emitter links to each other the grounded collector of PNP triode Q2 with emitter, the inductance L 1 of PNP triode Q2; The other end of inductance L 1 links to each other with the positive pole of diode D1, connects a capacitor C 1 simultaneously to ground; The negative pole of diode D1 links to each other with capacitor C 3, connects a capacitor C 2 simultaneously and a resistance R was clipped to ground in 1 minute; The input end of the other end Sheffer stroke gate U1B of capacitor C 3 links to each other with resistance R 2, another input termination power of U1B; The output terminal of U1B links to each other with the other end of resistance R 2, links to each other with an end of resistance R 3 simultaneously; The other end of resistance R 3 links to each other with the input end of U1C, connects a capacitor C 4 simultaneously to ground; The output terminal of U1C is the output terminal of demodulation waveforms, and this pin is connected to 23 pin of single-chip microcomputer.In this circuit, the span of inductance L 1 is 500uH, and the span of C1 is 3500pF, and wherein inductance L 1, capacitor C 1 value make that its resonance frequency is 125KHz; The span of R3 is 10k, and the span of capacitor C 4 is 2000pF.
Claims (4)
1, a kind of data reading circuit and related device thereof that adapts to the low frequency radio frequency IC-card of low-voltage, it is characterized in that device by single-chip microcomputer, ASK modulation circuit, LC resonant tank, diode envelope detection circuit, bandwidth-limited circuit, shaping amplification circuit is formed and be linked in sequence, the output of shaping amplification circuit connects tieback to single-chip microcomputer again, constitutes modulation circuit, resonant tank diode envelope detection circuit, bandwidth-limited circuit, the device feature of shaping amplification and the tandem circuit that is made of jointly resistance, electric capacity, diode, triode and inductance thereof thus.
2,, it is characterized in that in described tandem circuit according to the data fetch device of the described a kind of low frequency radio frequency IC-card of claim 1:
Single-chip microcomputer 21 pin are connected to the input pin of a Sheffer stroke gate U1A, 22 pin of single-chip microcomputer are connected to another input pin of U1, the output terminal of Sheffer stroke gate U1A links to each other with the base stage of NPN triode Q1, PNP triode Q2, the collector of NPN triode Q1 connects power supply, emitter links to each other the grounded collector of PNP triode Q2 with emitter, the inductance L 1 of PNP triode Q2;
The other end of inductance L 1 links to each other with the positive pole of diode D1, connects a capacitor C 1 simultaneously to ground;
The negative pole of diode D1 links to each other with capacitor C 3, connects a capacitor C 2 simultaneously and a resistance R was clipped to ground in 1 minute;
The input end of the other end Sheffer stroke gate U1B of capacitor C 3 links to each other with resistance R 2, another input termination power of U1B;
The output terminal of U1B links to each other with the other end of resistance R 2, links to each other with an end of resistance R 3 simultaneously;
The other end of resistance R 3 links to each other with the input end of U1C, connects a capacitor C 4 simultaneously to ground;
The output terminal of U1C is the output terminal of demodulation waveforms, and this pin is connected to 23 pin of single-chip microcomputer.
3, according to described a kind of data reading circuit and the related device thereof that adapts to the low frequency radio frequency IC-card of low-voltage of claim 1, it is characterized in that: the span of L1 is 400～600uH, the span of C1 is 3000～4000pF, and wherein L1, C1 value make that its resonance frequency is 125KHz.
4, according to described a kind of low frequency radio frequency IC-card data reading circuit and the related device thereof that adapts to low-voltage of claim 1, it is characterized in that: the span of R3 is 6.8k～15k, and the span of C4 is 1000～3300pF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201014425U CN201156257Y (en) | 2008-02-20 | 2008-02-20 | Data reading circuit for low frequency radio frequency IC card suitable for low voltage and corresponding apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008201014425U CN201156257Y (en) | 2008-02-20 | 2008-02-20 | Data reading circuit for low frequency radio frequency IC card suitable for low voltage and corresponding apparatus |
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| CN201156257Y true CN201156257Y (en) | 2008-11-26 |
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| CNU2008201014425U Expired - Fee Related CN201156257Y (en) | 2008-02-20 | 2008-02-20 | Data reading circuit for low frequency radio frequency IC card suitable for low voltage and corresponding apparatus |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957926A (en) * | 2010-09-09 | 2011-01-26 | 扬州恒信仪表有限公司 | Radio-frequency card reading and writing circuit controlled and formed by MCU supporting nanoWatt technology |
| CN101964043A (en) * | 2010-09-27 | 2011-02-02 | 南京南瑞继保电气有限公司 | Radio frequency wireless code reading circuit and decoding method thereof |
| CN102013737A (en) * | 2010-10-12 | 2011-04-13 | 浙江大学 | Wirelessly charged sensor node |
| 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 |
| CN102930237A (en) * | 2012-10-29 | 2013-02-13 | 杭州电子科技大学 | EM4095-based low-frequency card reader device capable of identifying three modulation modes |
| CN103869177A (en) * | 2012-12-10 | 2014-06-18 | 北京普源精电科技有限公司 | Radio frequency measuring device |
| CN107315977A (en) * | 2017-06-05 | 2017-11-03 | 广西荣中科技有限责任公司 | A kind of read write line |
| WO2018218874A1 (en) * | 2017-05-31 | 2018-12-06 | 广州众诺电子技术有限公司 | Chip position-reset apparatus |
| CN110632551A (en) * | 2019-10-09 | 2019-12-31 | 哈尔滨理工大学 | LF-RFID array monitoring device and monitoring method thereof |
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2008
- 2008-02-20 CN CNU2008201014425U patent/CN201156257Y/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN101957926A (en) * | 2010-09-09 | 2011-01-26 | 扬州恒信仪表有限公司 | Radio-frequency card reading and writing circuit controlled and formed by MCU supporting nanoWatt technology |
| CN101964043A (en) * | 2010-09-27 | 2011-02-02 | 南京南瑞继保电气有限公司 | Radio frequency wireless code reading circuit and decoding method thereof |
| CN102013737B (en) * | 2010-10-12 | 2013-12-11 | 浙江大学 | Wirelessly charged sensor node |
| CN102013737A (en) * | 2010-10-12 | 2011-04-13 | 浙江大学 | Wirelessly charged sensor node |
| CN102930237A (en) * | 2012-10-29 | 2013-02-13 | 杭州电子科技大学 | EM4095-based low-frequency card reader device capable of identifying three modulation modes |
| CN102930237B (en) * | 2012-10-29 | 2015-08-12 | 杭州电子科技大学 | The low frequency card reader arrangement of three kinds of modulation systems can be identified based on EM4095 |
| CN103869177A (en) * | 2012-12-10 | 2014-06-18 | 北京普源精电科技有限公司 | Radio frequency measuring device |
| CN103869177B (en) * | 2012-12-10 | 2018-03-16 | 北京普源精电科技有限公司 | Radio-frequency measurement device |
| WO2018218874A1 (en) * | 2017-05-31 | 2018-12-06 | 广州众诺电子技术有限公司 | Chip position-reset apparatus |
| WO2018218933A1 (en) * | 2017-05-31 | 2018-12-06 | 广州众诺电子技术有限公司 | Chip position-reset apparatus |
| CN107315977A (en) * | 2017-06-05 | 2017-11-03 | 广西荣中科技有限责任公司 | A kind of read write line |
| CN110632551A (en) * | 2019-10-09 | 2019-12-31 | 哈尔滨理工大学 | LF-RFID array monitoring device and monitoring method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081126 |