CN2239050Y

CN2239050Y - Reader with responder with passive, without contact and operation

Info

Publication number: CN2239050Y
Application number: CN 95241041
Authority: CN
Inventors: 范树春
Original assignee: Pike (nanjing) Electronic Technology Co Ltd
Priority date: 1995-12-13
Filing date: 1995-12-13
Publication date: 1996-10-30
Anticipated expiration: 2005-12-13

Abstract

The utility model aiming at a responder with passive, without contact and operation newly made in TI designs an intelligent recognition device. The intelligent recognition device is characterized in that a designed radio transmitting circuit and a designed receiving and amplifying circuit work with time interval. An electromagnetic field generated by the transmitting circuit provides energy source for the responder to send inner code information. After modulated by FSK, the inner code information is received and amplified by the receiving and amplifying circuit. Then the inner code information is sent to a radio frequency module for being demodulated by an IC chip. Then the inner code information is decoded and distinguished by using the general computer technology and special software. Real-time control is completed finally. The intelligent recognition device has the advantages of high security, easy operation and simple structure.

Description

Passive, as to exempt to contact, exempt from operation acknowledge device reader

The utility model is a kind of intelligent identification device, relates to wireless digital communication technology, the little power consumption IC technology of low-voltage and Microcomputer Technology field.

At present, the like product that has used has several forms such as magnetic card, IC-card, infra-red remote control, ultra-sonic remote control, preceding two kinds is passive contact, be that the entrained magnetic card of user, IC-card all are passive, but need take the way of contact usually said " swiping the card " to come to operate fully necessarily when using; The back is the active contact of exempting from for two kinds, and promptly the telepilot that the user held is active, and need connect to finish operation necessarily.From actual operating position, passive contact operation inconvenience, it is active that to exempt from the contact security performance poor, and these all have influence on the widespread use of the said goods.

In May, 1994, TIX finished a kind of comprehensive above-mentioned two series products separately advantage passive, exempt to contact, exempt from the technical though of operative intelligence identification, and developed transponder and these two kinds of critical components of radio-frequency module IC chip.The ISN scope of transponder is 64bit, this has guaranteed the uniqueness of ISN, the correction process scope that also has 16bit in addition in the transponder, this has strengthened the confidentiality of ISN greatly, transponder receives from its outside energy of electromagnetic field, and utilizes this energy that the ISN digital information in the transponder is outwards sent by modulated radiowave form.The technology of demodulation numerical information that transponder sends is solidified in Texas Instruments in its another critical component radio-frequency module IC chip.In the U.S., transponder and radio-frequency module IC chip have become commodity.But, because the difference of intelligent identification device institute's application and occasion, in concrete commercialization process, still existing a technical difficult problem, i.e. does the energy of information such as transponder transmission ISN come wherefrom? does how setting up the digital communication of valid wireless electricity between transponder and radio-frequency module IC chip get in touch? how to use Microcomputer Technology identification, judge transponder ISN correctness? how to finish real-time control?

The purpose of this utility model is: all kinds of transponders and the radio-frequency module IC chip (RI45538) sold with TIX are core devices, design a kind of wireless digital communication circuit that can get in touch between above-mentioned two core devices, be aided with Microcomputer Technology again, make passive, exempt to contact, exempt from operated intelligent identification device and have practical use widely.

For achieving the above object, the technical solution of the utility model is: reader is at all kinds of model transponders 1 design of TIX, and be critical component with the radio-frequency module IC chip (RI45538) 3 of Texas Instruments, also comprised wireless digital communication interface circuit 2, microcomputer and imput output circuit 4 thereof in the reader.The radio communication interface circuit is again by antenna 5, radiating circuit 7, receiving amplifying circuit 6 forms, the signal input part of radiating circuit is connected to 7 of radio-frequency module IC chip, 8 pin, the output terminal of radiating circuit is connected to antenna, the input end that receives amplifying circuit also is connected to antenna, the signal output part that receives amplifying circuit is connected to 6 pin of radio-frequency module IC chip, the clock end of microcomputer, signal controlling is connected to the respective end of radio-frequency module IC chip, whole reader is worked under application software control, 7 of microcomputer clock circuit control radio-frequency module IC chip, the square wave of a 134.2KHZ of 8 pin output, this square wave is through radiating circuit, antenna is to the electromagnetic field of extraneous radiation fixed frequency, to the transducer that to a certain degree can activate in the transponder, transducer converts electric field energy to charge storage in electric capacity again to this electromagnetic field greatly.When radiating circuit one stops outside radiation field, transponder is just made the energy from employing the electric charge that is stored in the electric capacity, the ISN in the transponder, preamble, string number such as postamble and error correcting code signal sends with the FSK modulation system, the information that sends is received by antenna again this moment, again through receiving 6 pin of sending into radio-frequency module IC chip after amplifying circuit filtering is amplified, this chip carries out demodulation to the digital signal that transponder sends, error correction, again by the microcomputer that Application Software Program is housed, according to certain ISN form, the numerical information that storage in advance in the numerical information that receives and the reader is provided with contrasts, judge that computing machine in time sends steering order according to judged result again.

Advantage of the present utility model is: this reader is developed on high-tech product basis in the world today and is finished, the wireless digital communication interface circuit economical rationality of designing, and on the Basic Applied Software of being developed, by microcomputer and imput output circuit, finished judging from the transponder information processing, and in time control corresponding mechanism work with judged result, finished to passive, exempt to contact, exempt from the Intelligent Recognition of operation acknowledge device, have strong security, easy to use, simple in structure, advantage such as application is extensive.

Accompanying drawing 1 is a circuit structure block scheme of the present utility model.

Accompanying drawing 2 is the electrical schematic diagram of the utility model wireless digital communication circuit.

Accompanying drawing 3 is the structured flowchart of an embodiment of the utility model.

Embodiment one: intelligent entrance guard system, concrete structure is referring to accompanying drawing 3.

Also added metal detector 9, door state detector 10 and warning circuit 11 outside the reader 8, antenna 5 is fixed on the door, and antenna must can both use to guarantee the cassette transponder that the user is placed in Bao Nei or the pocket apart from 50 centimetres on ground when installing.Reader main frame etc. is installed in an inboard, and aerial plug inserts main frame, and main frame is connected and exchanged 220 volts of power supplys.Detector adopts the electrostatic induction formula, as long as the metal of messenger's one contact door lock partly, electrostatic induction just produces a low level, and then the control reader is started working, reader sends the signal of the 134.2KHZ of 50-100ms earlier, make before and after the antenna in about 1 meter the scope and produce an electric field, at this moment the LC loop in the entrained transponder of messenger produces resonance, the result of resonance constantly discharges and recharges electric capacity, make like this and accumulated certain energy of a charge in the electric capacity, when radiating circuit stops outside radiation field, the electric charge that has stored in the transponder is as the energy, the ISN in the transponder, preamble, string number such as postamble and error correcting code signal sends with the FSK modulation system.Reader is after emission one stops, then begin to receive the signal of sending by transponder immediately, and fsk signal filtering, amplification, demodulation, error correction, the number that the ISN and the reader of messenger's transponder are registered in advance compares again, correct as number, belong to the guest who allows turnover, control gear is opened door lock 12.Not right as number, do not belong to the guest who allows turnover, then door lock is not opened and is reported to the police.Door state detector 10 is sent the door status signal into microsystem, reported to the police when about 20 seconds door lock opening time, or door lock does not lock 10-25 warning in second.Under the support of computer application software, by keyboard and display, can also realize functions such as registration, deletion, inquiry, modification, for preventing the keyboard illegal operation, be provided with cipher control.In addition, registration number and deletion number also can be finished by the mode of ISN in the direct reading transponder.

Claims

1, a kind of passive, exempt from contact, exempt from the reader of operation acknowledge device, it is by the wireless digital communication circuit, radio-frequency module IC chip, microcomputer, input/output interface circuit is formed, it is characterized in that: the wireless digital communication circuit is by radiating circuit, antenna, the reception amplifying circuit constitutes, the signal input part of radiating circuit is connected to 7 of radio-frequency module IC chip (RI45538), 8 pin (TXLO, TXHI), the output terminal of radiating circuit is connected to antenna, the input end that receives amplifying circuit also is connected to antenna, the signal output part that receives amplifying circuit is connected to radio-frequency module IC chip 6 pin (A1IN), the clock end of microcomputer, signal controlling is connected to 16 of radio-frequency module IC chip, 15,14 pin (RXCK, RXDT, TXCT), microcomputer is worked under the support of application software, 7 of the clock circuit control radio-frequency module IC chip of computing machine, the square wave of 8 pin 134.2KHZ of output in certain period, this square wave is through radiating circuit and the antenna electromagnetic field to extraneous radiation fixed frequency, this electromagnetism field energy activates the transducer in the transponder, transducer converts energy of electromagnetic field to charge storage in electric capacity, when radiating circuit one stops outside radiation field, the electric charge that transponder just will be stored in the electric capacity is automatically made the energy, the ISN in the transponder, preamble, string number such as postamble and error correcting code signal adopts the FSK modulation system to send, the information that sends is received by antenna again this moment, again through receiving amplifying circuit filtering, after the amplification, send into 6 pin of radio-frequency module IC chip, this chip carries out demodulation to the digital signal that transponder sends, error correction, again by the Application Software Program microcomputer is housed, according to certain ISN form, the numerical information that storage has been set in the numerical information that receives and the memory is in advance contrasted, judge that last computing machine in time sends steering order according to judged result again.