CN2911796Y - I.C card reader - Google Patents
I.C card reader Download PDFInfo
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- CN2911796Y CN2911796Y CN 200620034775 CN200620034775U CN2911796Y CN 2911796 Y CN2911796 Y CN 2911796Y CN 200620034775 CN200620034775 CN 200620034775 CN 200620034775 U CN200620034775 U CN 200620034775U CN 2911796 Y CN2911796 Y CN 2911796Y
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- card reader
- gate circuit
- identity card
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- 238000007493 shaping process Methods 0.000 claims description 9
- 238000005516 engineering process Methods 0.000 abstract description 4
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- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000003321 amplification Effects 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
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Abstract
The utility model relates to a radio frequency identification technology, in particular to a second-generation radio frequency ID card reader and identification device. The utility model resolves the problem that the existing ID card reader has high cost and poor security. The technical proposal of the utility model is that an ID card reader comprises a security module, a radio frequency module and an antenna unit, wherein the radio frequency module comprises a single-chip microcomputer, a sender and a receiver; the sender comprises a gate circuit and a lock-out device; the receiver is composed of a gate circuit, a counter, a trigger and a voltage comparator. The beneficial effects of the utility model are that circuit constitution adopts the general components; goods supply is sufficient; cost is low; the specialized import is not required and security is strong.
Description
Technical field
The utility model relates to REID, and particularly second generation radio frequency I.D. is read recognition device.
Background technology
Radio frequency discrimination RFID (Radio Frequency Identification) technology is a kind of contactless automatic identification technology.Rfid system generally is made up of identification card and reader.According to the structure of identification card, can be divided into active identification card and passive identification card.The basic functional principle of passive identification card is: read write line activates the identification card in the electromagenetic wave radiation field by the antenna launching electromagnetic wave, powers and sends read write command to identification card.After identification card is received instruction, with the storage data load is modulated after, the backscattering electromagnetic wave obtains the data message of identification card to reader behind the reader receiving demodulation.
Second generation I.D. promptly belongs to a kind of passive identification card.Because I.D., the identity information of its storage will be discerned second generation I.D. through special encryption, and the security module that needs to adopt public security organ to provide is deciphered data.Identity card reader is generally by security module, and radio-frequency module and antenna constitute, and radio-frequency module is launched the ASK carrier signal by antenna, and accepts the BPSK carrier signal that I.D. returns, and through phase demodulating, data is sent to the security module deciphering, reads identity information.
Have identity card reader now, adopt the special-purpose radio-frequency chip of external import, be equipped with controller again, cost surpasses 100 yuan, and has the hidden danger of information security.
The utility model content
Technical problem to be solved in the utility model is exactly at existing identity card reader cost height, the shortcoming that confidentiality is not strong, a kind of radio-frequency module that adopts custom integrated circuit and discrete device to constitute is provided, with import substitutes, reduce cost, strengthen confidentiality.
The utility model solve the technical problem, and the technical scheme of employing is that identity card reader comprises security module, radio-frequency module and antenna element, it is characterized in that:
Described radio-frequency module is by single-chip microcomputer, and transmitter and receiver are formed;
Described transmitter is made of gate circuit and discrete device; Described transmitter comprises oscillator, modulator and power amplifier; Described oscillator is connected with single-chip microcomputer, and described modulator is connected with oscillator, and described power amplifier is connected with modulator and antenna element;
Described receiver comprises shaping amplifier and detuner; Described shaping amplifier is connected with antenna element, and described detuner is connected with amplifier and single-chip microcomputer.
The beneficial effects of the utility model are, circuit constitutes and adopts universal elements, and ample supply and prompt delivery are with low cost, do not need special import, strong security.
Description of drawings
Fig. 1 is a structured flowchart of the present utility model;
Fig. 2 is the pierce circuit synoptic diagram;
Fig. 3 is the modulator circuit synoptic diagram;
Fig. 4 is the power amplifier circuit synoptic diagram;
Fig. 5 is the receiver architecture block diagram;
Fig. 6 is the acceptor circuit synoptic diagram.
Embodiment
Below in conjunction with drawings and Examples, describe the technical solution of the utility model in detail.
As shown in Figure 1, identity card reader of the present utility model is formed structure and is comprised security module, single-chip microcomputer (CPU), transmitter and receiver, and antenna element.
Under Single-chip Controlling, transmitter activates I.D. by antenna element emission ASK carrier signal.I.D. enters status recognition, outwards launches the BPSK carrier signal, and antenna element receives the signal of I.D. emission, input sink.Receiver is handled back (comprise shaping amplify and BPSK demodulation) to signal, is sent to the security module identification of decoding by single-chip microcomputer.
Embodiment
This routine CPU selects the product of Philips company for use, and model is 8 single-chip microcomputers of P89LPC932, and clock frequency is 12MHz.
This routine transmitter is made of gate circuit and discrete device.Comprise oscillator, modulator and power amplifier.
Fig. 2 is the circuit diagram of oscillator, and U6 is that model is four-2 input nand gate circuit of 74HC00, comprises U6A～D.Sheffer stroke gate U6A is connected into phase inverter, and with crystal oscillator X2, resistance R 1 and capacitor C 1, C2 produce the rf oscillation signal of 13.56MHz together.Sheffer stroke gate U6B input end is connected with CPU among Fig. 2, is used for the output of control generator.When not having I.D. on the reader, CPU sends control signal, cuts off the output of radiofrequency signal, makes power amplifier be in cut-off state, reaches the purpose of saving electric energy.
Fig. 3 is modulator circuit figure, and Sheffer stroke gate U6D is connected into phase inverter among the figure, and its input end is connected with CPU, and the modulation signal of CPU output is added to the base stage of triode T1 by resistance R 3 and capacitor C 5.Triode T1 and diode D1, D2 form modulation circuit, and resistance R 2 is biasing resistors of triode T1, and capacitor C 3, C4 are the power supply decoupling capacitance.The output terminal RFPOWER (radio-frequency power supply) of modulator, the output degree of modulation is 8%～14% modulation voltage, as the working power of power amplifier.
Fig. 4 shows power amplifier circuit figure.The radiofrequency signal of oscillator output end A output is divided into two-way, and the model of leading up to is the amplifying circuit that the not circuit U7 of 74AC04 constitutes, and is sent to antenna element, and this amplifying circuit is composed in parallel by six not gates of a slice 74AC04; Another road is anti-phase by not gate U8A, amplifies through five not gate U8B～F amplifying circuit that constitutes in parallel again, is sent to antenna element, and U8A～F is another sheet 74AC04.The power supply of above-mentioned amplifying circuit is connected with the modulation voltage of modulator output, and promoting the antenna transmission frequency is 13.56MHz, and degree of modulation is 8%～14% ASK carrier signal.
Fig. 5 is the structured flowchart of receiver.The 847KHzBPSK carrier signal of I.D. emission, B enters shaping amplifier by the antenna element output terminal, and through the filter shape of shaping amplifier, the buffering amplification waits processing, sends into detuner, carries out the BPSK demodulation.
Fig. 6 shows the electrical block diagram of receiver.Among the figure, the signal that antenna receives enters from the B end, and through diode D3, D4, the clamper filtering circuit that capacitor C 6, C7, C8 and resistance R 4, R5, R6 form leaches the radiofrequency signal of 13.56MHz, the BPSK carrier signal of output 847KHz.This signal is coupled to the buffer amplifier circuit that triode T2 forms by capacitor C 9, carries out paraphase and amplifies, and resistance R 7, R8, R9 constitute the biasing circuit of triode among the figure.
BPSK carrier signal through buffering is amplified enters three grades of shaping amplification circuits that are made of not circuit CD4069 by capacitor C 10 and resistance R 10.Not circuit U5A and feedback resistance R11 form the 1st grade of amplifying circuit; Not circuit U5C and feedback resistance R13 form the 2nd grade of amplifying circuit; Not circuit U5D and feedback resistance R15 form the 3rd level amplifying circuit.Capacitor C 11, C12 are coupling capacitance among the figure, and resistance R 12, R13 are the amp.in current-limiting resistance.CD4069 is six not circuits, and above-mentioned Sheffer stroke gate U5A, U5C and U5D only are wherein three, other three untapped not circuits, and input end grounding, output terminal is unsettled.
Through the shaping amplifying signal, isolate amplification by the phase inverter that NAND gate circuit U6C is connected into, the input detuner carries out the BPSK demodulation.
This routine detuner is by NOR gate circuit U1, trigger U4, and counter U2 and voltage comparator U3 form.NOR gate circuit U1 model is 74HC86, is four-2 input NOR gate circuits, the U1A～D among Fig. 6; The model of trigger U4 is 74HC74, is two D flip-flops, U4A among Fig. 6 and U4B; The model of counter U2 is 74HC393, is two 4bit counters, U2A among Fig. 6 and U2B; The model of voltage comparator U3 is LM393, is two voltage comparators, U3A among Fig. 6 and U3B.Among Fig. 6, resistance R 7, capacitor C 13 are formed the tabulation circuit, and resistance R 16, R18 and R20 provide reference voltage for voltage comparator, and resistance R 19, R21 are comparer U3A and U3B output terminal pull down resistor.
The output terminal of receiver is the output terminal of XOR gate U1C, and this output terminal is connected with CPU, and CPU output is sent to security module from signal and is carried out data decode, finishes I.D. and reads identification.
Claims (10)
1. identity card reader comprises security module, radio-frequency module and antenna element, it is characterized in that:
Described radio-frequency module is by single-chip microcomputer, and transmitter and receiver are formed;
Described transmitter is made of gate circuit and discrete device; Described transmitter comprises oscillator, modulator and power amplifier; Described oscillator is connected with single-chip microcomputer, and described modulator is connected with oscillator, and described power amplifier is connected with modulator and antenna element;
Described receiver comprises shaping amplifier and detuner; Described shaping amplifier is connected with antenna element, and described detuner is connected with amplifier and single-chip microcomputer.
2. identity card reader according to claim 1 is characterized in that described gate circuit comprises NAND gate circuit and not circuit.
3. identity card reader according to claim 2 is characterized in that, described NAND gate circuit model is 74HC00, and described not circuit model is 74AC04.
4. according to claim 1,2 or 3 described identity card readers, it is characterized in that described receiver is by gate circuit, counter, trigger and voltage comparator constitute.
5. identity card reader according to claim 4 is characterized in that described gate circuit comprises not circuit, NAND gate circuit and NOR gate circuit.
6. identity card reader according to claim 5 is characterized in that, described not circuit model is CD4069, and described NAND gate circuit model is 74HC00, and described NOR gate circuit model is 74HC86.
7. identity card reader according to claim 4 is characterized in that, described counter model is 74HC393.
8. identity card reader according to claim 4 is characterized in that, described trigger model is 74HC74.
9. identity card reader according to claim 4 is characterized in that, described voltage comparator model is LM393.
10. identity card reader according to claim 1 is characterized in that, described single-chip microcomputer model is P89LPC932.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620034775 CN2911796Y (en) | 2006-06-29 | 2006-06-29 | I.C card reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620034775 CN2911796Y (en) | 2006-06-29 | 2006-06-29 | I.C card reader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2911796Y true CN2911796Y (en) | 2007-06-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620034775 Expired - Fee Related CN2911796Y (en) | 2006-06-29 | 2006-06-29 | I.C card reader |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2911796Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8193985B2 (en) | 2008-08-27 | 2012-06-05 | Mstar Semiconductor, Inc. | Radio frequency positioning system and method |
| CN101672907B (en) * | 2008-09-12 | 2013-05-22 | 晨星软件研发(深圳)有限公司 | Radio Frequency Positioning System and Method |
-
2006
- 2006-06-29 CN CN 200620034775 patent/CN2911796Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8193985B2 (en) | 2008-08-27 | 2012-06-05 | Mstar Semiconductor, Inc. | Radio frequency positioning system and method |
| CN101672907B (en) * | 2008-09-12 | 2013-05-22 | 晨星软件研发(深圳)有限公司 | Radio Frequency Positioning System and Method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |