CN201017327Y

CN201017327Y - Wireless radio frequency recognizing card reading device

Info

Publication number: CN201017327Y
Application number: CNU2007201041339U
Authority: CN
Inventors: 田靖
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-04-05
Filing date: 2007-04-05
Publication date: 2008-02-06
Anticipated expiration: 2017-04-05

Abstract

The utility model discloses a RF identity card reader, which comprises a RF module, wherein, the RF module comprises a frequency generator circuit, a LC oscillation circuit, a filtering circuit, a amplifying circuit, and a two-stage shaping circuit, wherein, the frequency generator circuit provides signals to the LC circuit, the LC oscillation circuit provides signals to the filtering circuit, the filtering circuit provides signals to the amplifying circuit, and the amplifying circuit provides signals to the two-stage shaping circuit. With the technical scheme of the utility model, the power consumption can be reduced, and, in idle state, the power consumption of the device is 20-50 Mu A, in normal working state, the power consumption is 20mA; compared to the prior art, the cost of the device is reduced greatly; the utility model doesn't need any key to access the card; instead, the card reader detects the card automatically and intelligently, and can access the card when it finds the card.

Description

A kind of radio frequency identification reader device

Technical field

The utility model relates to radio frequency identification, and (Radio Frequency Identification, RFID) technical field relate in particular to a kind of radio frequency identification reader device.

Background technology

Radio frequency identification is a kind of contactless automatic identification technology, and it is by the automatic recognition objective object of radiofrequency signal and obtain related data.The simplest rfid system is made up of label (Tag), reader device (Reader), antenna (Antenna) and computing machine four parts, also needs the support of other hardware and softwares in actual applications.RFID is the means of article mark in itself, and purpose is the data of carrying by in recognition or the Checking label, to satisfy the application-specific needs.Data in the label can provide identification to identity, animal or the individuality of the part in making, commodity in transit, position, the vehicles.

At present, REID develops very soon, is widely used in industrial automation, various fields such as business automation and communications and transportation control and management.Instantiationization, label is meant non-contact IC card, this card inside solidification 64 unique codings in the whole world, available 125K radio frequency is distinguished.In 125K low-frequency information recognition technology field, its technical characterstic is that frequency is low, and distance is near, but can be applied to security protection, the gate inhibition, and the night watching cruising inspection system, reader device is used at home widely.Fig. 1 is the electrical block diagram of reader device.As shown in Figure 1, the circuit structure of reader device is formed main control singlechip chip, radio frequency chip, clock chip, storage chip.

Fig. 2 is a Card Reader circuit diagram in the prior art.As shown in Figure 2, the Card Reader circuit that many a kind of Card Reader circuit of use on the market are based on radio frequency chip U2270B is patrolled and examined in night watching, the main control singlechip chip can be 51 series or PIC series monolithic etc., and storage chip is the 24LC256 chip of EEPROM etc., and clock chip is PCF8563T.The groundwork process person of being to use holds card reader and imitates in the distance, push button and carry out Card Reader, system starts working, as the Card Reader success, hummer is rung, and the LED luminotron glimmers several times, after single-chip microcomputer is received the data of sensing card from radio frequency chip U2270B, from the PCF8563T clock chip, get current time data simultaneously, be saved in together in the 24LC256 chip then.When treating that the preservation of 24LC256 chip data is full, the user can be connected to host computer to card reader by serial ports, uploads the operation of data.

One of shortcoming of existing scheme is the power consumption height, reach 60mA during Card Reader, its most electric currents all consume when U2270B chip Card Reader, on the other hand, for fear of the current drain of U2270B chip when the Card Reader not, existing U2270B scheme generally also will be used one by the key control Card Reader, promptly when the user uses the recognizer Card Reader, effectively needing to click button in the Card Reader distance, the U2270B Card Reader of working, system closing U2270B during Card Reader not, and be in sleep state to reduce power consumption.Two of existing scheme shortcoming is that cost is higher relatively, mainly is because U2270B chip and PCF8563T clock chip cost are higher.

The utility model content

The purpose of this utility model is to propose a kind of radio frequency identification reader device, can reduce the power consumption of reader device, and saves cost.

For reaching this purpose, the utility model by the following technical solutions:

A kind of radio frequency identification reader device, comprise radio-frequency module, described radio-frequency module comprises frequency generator circuit, LC oscillation circuit circuit, filtering circuit, amplifying circuit and two-stage shaping circuit, described frequency generator circuit outputs signal to described LC oscillation circuit circuit, described LC oscillation circuit circuit output signal is given described filtering circuit, described filtering circuit outputs signal to described amplifying circuit, and described amplifying circuit outputs signal to described two-stage shaping circuit.

Described frequency generator circuit comprises that imitating triode, second for first imitates triode and resistance, imitates triode ground connection, described second and imitates triode and connect positive supply for described first, and described resistance is used for current-limiting protection.

Described LC oscillation circuit circuit comprises inductive sensor coil and LC oscillating capacitance, saves the tie point of shake an inductive sensor coil and LC oscillating capacitance.

Described filtering circuit comprises diode, an operational amplifier, three electric capacity and three resistance, it is positive half cycle signal that described diode is used for the filtering input signal, described operational amplifier, three electric capacity and three resistance are used for the 125K frequency of described positive half cycle signal is filtered, form the changes in amplitude of low frequency signal, output to operational amplifier first pin.

Described amplifying circuit comprises an operational amplifier, three resistance and two electric capacity, is used for changes in amplitude amplification and output with the low frequency signal of input.

Described two-stage shaping circuit comprises two operational amplifiers, five electric capacity and three resistance, and being used for the signal shaping of input is the square-wave signal of Manchester's cde, and the signal that outputs to single-chip microcomputer reads in pin.

Adopt the technical solution of the utility model, cancelled button, surveyed Card Reader, be that the card reader per second surveys several times in the coverage whether card is arranged, carry out Card Reader again, reduce power consumption so greatly if any card, electric current 10mA during Card Reader, static instrumentation electric current 20-50uA; Use amplifier chip LMV324 to replace the U2270B radio frequency chip, FLASH storage chip SST25LF080A replaces 24LC256, and storage space is 32 times of the latter, and DS1302 replaces the PCF8563 clock chip, thereby reduces cost greatly.

Description of drawings

Fig. 1 is the electrical block diagram of reader device;

Fig. 2 is a Card Reader circuit diagram in the prior art;

Fig. 3 is the structural representation of radio-frequency module in the radio frequency identification reader device in this embodiment;

Fig. 4 is the circuit diagram of reader device in this embodiment.

Embodiment

Further specify the technical solution of the utility model below in conjunction with accompanying drawing and by embodiment.

The Card Reader circuit is in the low-power consumption dormant state at ordinary times, per second wakes (wake-up times is customizable) up 2 times by main control singlechip, and the back starts frequency drives, reference voltage to radio-frequency module, operating voltage, and survey simultaneously, as the interior no IC-card of effective Card Reader distance, then main control singlechip is closed frequency drives, reference voltage, operating voltage, the Card Reader circuit enters the low-power consumption dormant state, waits for next wake operation; As in effective Card Reader distance IC-card being arranged, main control singlechip starts radio-frequency module Card Reader operation carrying out Card Reader, as read valid data, then main control singlechip reads the current time from clock chip again, the back current time and IC-card data storage in storage chip, after finishing, the Card Reader circuit enters the low-power consumption dormant state, waits for next wake operation.When uploading data, the Card Reader circuit correctly is linked into host computer, carries out associative operation by host computer and get final product as need.

Fig. 3 is the structural representation of radio-frequency module in the radio frequency identification reader device in this embodiment.As shown in Figure 3, radio-frequency module comprises frequency generator circuit 101, LC oscillation circuit circuit 102, filtering circuit 103, amplifying circuit 104 and two-stage shaping circuit 105.Frequency generator is imitated triode M1 by the field, and M2 and R6 form, and going into level is single-chip microcomputer RDEN pin, is connected to M1, M2, and M1 ground connection, M2 connects positive supply, and back M1, M2 output to next stage jointly.LC oscillation circuit module is by Card Reader telefault H1 and capacitor C 6.To shake a little be the tie point of H1 and C6 to joint, and next stage is from joint some numbers of winning the confidence of shaking.Filtration module is by diode D1, U4A and C7, C8, C9, R7, R8, R9 form, and a D1 trap signal that shakes is positive half cycle signal, U4A and related resistors electric capacity filter the 125K frequency of positive half cycle signal again, form the changes in amplitude of low frequency signal, output to U4A first pin.Amplification module is by U4B and R10, R11, and R12, C10, C11 forms, and act as the amplification of the changes in amplitude of upper level low frequency signal, outputs to down two-stage and carries out shaping.The two-stage Shaping Module is by U4C, U4D and R13, and R14, R15, R16, R17, C12, C13, C14 forms, and is higher level's signal shaping the square-wave signal of the Manchester's cde of standard, outputs to the INPUT pin of single-chip microcomputer, directly reads coding by single-chip microcomputer.

Fig. 4 is the circuit diagram of reader device in this embodiment.As shown in Figure 4, U1 is main control singlechip PIC16F628A; U2 is FLASH storage chip SST25LF080A, and capacity is 8Mbit; U3 is clock chip DS1302; U4 is integrated transporting discharging chip LMV324, and its inner integrated 4 amplifiers are respectively U4A, U4B, U4C, U4D; Y1 is a single-chip microcomputer work crystal oscillator, and Y2 is a clock chip work crystal oscillator; L1 is the LED light emitting diode; B1 is a hummer; D1 is a filtered diode; H1 is the Card Reader telefault that enameled wire twines; M1, M2 are effect triodes; All the other resistance, electric capacity etc. act on the related work circuit.

Wherein U1 the 3rd pin is connected with hummer B1, and crus secunda is connected with the L1 luminotron by current-limiting resistance R2, and the 4th pin is a U1 power on reset pin; The 5th pin ground connection; 14 pin meet positive supply Vcc; 15,16 pin are received the work crystal oscillator; The 8th, 10,11,12,13 pin are the connecting pin of DS1302 and SST25LF080A.

U1 the 1st pin REF provides reference voltage signal for LMV324 Card Reader circuit, and the 9th pin RDEN provides 125K frequency drives signal for Card Reader LC vibration, and the 18th pin provides operating voltage VDD by current-limiting resistance R5 and decoupling capacitance C3 for LMV324 Card Reader circuit; The 17th pin INPUT for recognition pin, promptly the IC-card data of sensing in the LMV324 Card Reader sensor circuit from then on pin read in by single-chip microcomputer.

The concrete course of work: be sleep state when U1 is flat, wake up by inner house dog, survey then, operations such as Card Reader, frequency is a per second about 2 times (customizable), and after waking up, U1 provides reference voltage to REF, VDD powers on provides operating voltage to LMV324, provide the 125K frequency to survey to RDEN, as not detecting IC-card in effective Card Reader distance, U1 enters sleep and waits for next time to wake up automatically and carries out the Card Reader operation, as detect IC-card, then carry out the Card Reader operation again, after the Card Reader success, from the U3 read apparatus current time, and time and IC-card data deposited in U2 in the lump, U1 closes REF after depositing in successfully, and VDD is behind the RDEN pin correlation function, enter the sleep wait once more and wake the Card Reader operation up next time, by that analogy.

During Card Reader, the 125K frequency,, is added in the LC oscillation circuit of H1 and C6 composition behind the R6 through M1, M2 by the RDEN pin, and wherein C6 is the LC oscillating capacitance, and H1 is the inductive sensor coil.When in effective distance card being arranged, contactless IC card can make it produce changes in amplitude by anti-phase modulation LC oscillation circuit, diode D1 is filtered into positive half cycle signal by the number of winning the confidence of LC oscillation point then, after be added to the amplification filtering shaping circuit that LMV324 chip and related resistors electric capacity are formed, from the waveform of INPUT output Manchester's cde, carry out the effective recognition operation at last by U1.

When uploading data if desired, can be connected to relevant serial communication chip, upload operations such as data by the control of host computer related command by the 6th pin of U1 to host computer.

Wherein, the LMV324 chip of integrated four amplifying circuits just can be by LMV358 chip replacement of two integrated two amplifying circuits etc.; Single-chip microcomputer PIC16F628A can be by MSP430 series monolithic replacement etc.

Advantage of the present utility model is low-power consumption, and not having card detection power consumption at ordinary times is 20-50uA, Card Reader power consumption 20mA; Low cost, the scheme cost reduces greatly compared to existing technology; No button does not need button to carry out Card Reader, carries out automated intelligent and surveys, and has detected card and has carried out Card Reader again.

The above; it only is the preferable embodiment of the utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with the people of this technology in the disclosed technical scope of the utility model; the variation that can expect easily or replacement all should be encompassed within the protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.

Claims

1. radio frequency identification reader device, comprise radio-frequency module, it is characterized in that, described radio-frequency module comprises frequency generator circuit, LC oscillation circuit circuit, filtering circuit, amplifying circuit and two-stage shaping circuit, described frequency generator circuit outputs signal to described LC oscillation circuit circuit, described LC oscillation circuit circuit output signal is given described filtering circuit, and described filtering circuit outputs signal to described amplifying circuit, and described amplifying circuit outputs signal to described two-stage shaping circuit.

2. a kind of radio frequency identification reader device according to claim 1; it is characterized in that; described frequency generator circuit comprises that imitating triode, second for first imitates triode and resistance; described first effect triode ground connection, described second effect triode connect positive supply, and described resistance is used for current-limiting protection.

3. a kind of radio frequency identification reader device according to claim 1 is characterized in that, described LC oscillation circuit circuit comprises inductive sensor coil and LC oscillating capacitance, saves the tie point of shake an inductive sensor coil and LC oscillating capacitance.

4. a kind of radio frequency identification reader device according to claim 1, it is characterized in that, described filtering circuit comprises diode, an operational amplifier, three electric capacity and three resistance, it is positive half cycle signal that described diode is used for the filtering input signal, described operational amplifier, three electric capacity and three resistance are used for the 125K frequency of described positive half cycle signal is filtered, form the changes in amplitude of low frequency signal, output to operational amplifier first pin.

5. a kind of radio frequency identification reader device according to claim 1 is characterized in that, described amplifying circuit comprises an operational amplifier, three resistance and two electric capacity, is used for changes in amplitude amplification and output with the low frequency signal of input.

6. a kind of radio frequency identification reader device according to claim 1, it is characterized in that, described two-stage shaping circuit comprises two operational amplifiers, five electric capacity and three resistance, being used for the signal shaping of input is the square-wave signal of Manchester's cde, and the signal that outputs to single-chip microcomputer reads in pin.

7. a kind of radio frequency identification reader device according to claim 1, it is characterized in that, also comprise main control singlechip, FLASH storage chip and clock chip, described main control singlechip model is PIC16F628A, described FLASH storage chip model is SST25LF080A, and described clock chip model is DS1302.