Application Design of RFID Technology in Library Security System!RFID Card Wholesaler

　　Friends who have been to the library know that the library has a very strict management anti-theft system, and this anti-theft management system is the access control system, which is a control system to ensure the safety of library resources and improve the management efficiency and management level of the library.

　　A complete library access control system requires a combination of computer technology, network technology, and target recognition technology. At present, there are many library access control systems on the market, but most of these access control systems are customized and developed according to different library information conditions Yes, because the original library management system structure is different, it is very inconvenient to link the access control system with other library management systems. In addition, the functions of most library access control systems remain at the level of security management and automatic loan and return. In order to achieve a seamless link between the access control system and various digital libraries, expand the functions of the access control system, and improve the self-service level of the library, the market has developed a set of self-service access control systems for college libraries based on RFID smart cards. It will greatly improve the functions of the library's access control system and increase the stability of the library's daily security management.

　　一. RFID technology principle and application scope

　　The basic principle of RFID (Radio Frequency Identification) technology is to use radio frequency signals and spatial coupling (inductive or electromagnetic coupling) transmission characteristics to realize automatic identification of identified objects. As a wireless version of bar codes, RFID technology has the advantages of waterproof, anti-magnetic, high temperature resistance, long service life, long reading distance, data encryption on smart cards, larger data storage capacity, and more free storage of information that are not available in bar codes. Recognized by the world as one of the ten important technologies of this century, it is a non-contact automatic identification technology realized by radio frequency communication.

　　As the most basic RFID system used in library security system, the RFID system generally includes the following parts: a smart card that carries information about the target, that is, an RFID smart card, and an antenna that transmits RF signals between the reader and the RFID unit. , An RFID reader that receives the RF signal returned from the RFID smart card and transmits the decoded data to the host system for processing. At present, the RFID system has shown its talents in the fields of traffic management, warehouse management, logistics management, production line tracking, etc. The advantages of the transmission function are reflected in the docking system of modern enterprise management.

　　2. Library RFID technology application

　　In addition to applications in the fields of traffic management, warehouse management, logistics management, and production line tracking, RFID technology has attracted the attention of libraries at home and abroad due to its unique characteristics. Among them, the National Library of Singapore, an Asian country, began to use RFID technology in late 1998, becoming the first library in the world to apply this technology. Subsequently, the United States, Australia, and China have successively adopted RFID technology.

　　With the widespread popularization of RFID technology in the world, in 2006, my country's first RFID smart library, the Chengyi College Library of Jimei University was built and put into use. Since then, many libraries such as the New Shenzhen Library, the National Library, and the Shanghai Changning District Library have all applied RFID technology.

　　3. The role of RFID technology in the application of book light

　　●Self-service book borrowing and returning system: Provide readers with self-service book borrowing and returning operations without the intervention of library managers;

　　●Book sorting: to realize automatic inventory, arrangement and order of collection materials, so as to achieve the purpose of borrowing and returning;

　　●RFID security detection: For books that have not been checked out or are forbidden to be loaned out, the security check device will alarm when going out to remind management personnel to stop them in time.

　　The library system through RFID technology, the library has made significant contributions to the library industry in terms of effectively improving management accuracy, improving service image, expanding and extending services, etc., and improving the performance of the library’s security system

　　4. Other extended applications of RFID technology

　　Another application of RFID technology is the application of smart cards. Smart cards are also called integrated circuit cards, or IC cards, which embed an integrated circuit chip in a plastic substrate and encapsulate it into a card form. RFID smart card is a non-contact IC card. It has the characteristics of small size, large capacity, long life, reusable, etc. It can support fast reading and writing, non-visual recognition, mobile recognition, multi-target recognition, positioning and long-term tracking management.

　　The IC card was developed by Motorola in 1977 in cooperation with one of its computer customers. Since then, the smart card has been incapable of being deciphered and imitated with its thin and small size, advanced integrated circuit chip technology. The characteristics are universally welcomed and have achieved unprecedented development worldwide. At present, various smart cards are increasingly used in various fields of the national economy and penetrate into the daily lives of residents.

　　5. Introduction to the structure and function of the IC card

　　RFID smart card is mainly composed of antenna, radio frequency interface, and micro-control unit. The modules and functions included in each component are as follows:

　　Antenna: Used to receive the signal sent by the RFID reader and send the data information back to the RFID reader.

　　RF interface circuit: mainly includes waveform converter, modulator/demodulator, rectifier, voltage regulator, oscillator, etc. The waveform converter receives the radio modulation signal on the reader, and sends it to the modulation/demodulation module on the one hand, and performs waveform conversion on the other hand to convert the sine wave into a square wave, then rectify and filter it, and the voltage regulator module performs Further processing, such as voltage stabilization, etc., the final output is supplied to each working circuit on the card. The oscillator generates a high-frequency signal for modulation/demodulation and a clock signal for the micro-control unit.

　　Micro control unit: realize the recognition of the smart card and execute the instructions of the reader. Including logic control unit, request response unit, anti-collision unit, data encryption unit, storage unit (including E2PROM and ROM), etc.

　　Request response unit: When an RFID smart card is within the working range of the reader’s antenna, after the reader sends a command to the RFID smart card, the request response unit will be activated, and the card number of the smart card will be transmitted to the reader to establish a smart card The first step to communicate with the reader. Otherwise, the reader will not perform other read and write operations on the smart card.

　　Data encryption unit: Complete the encryption processing and password protection of the data.

　　Storage unit: Including E2PROM and ROM, mainly used to store data, the data that the user wants to store (the reader's personal information, such as name, profession, hobby, borrowing and returning books, etc., can also store personal accounts) is stored in this unit. The data in E2PROM will be retained even after the smart card loses power and the smart card leaves the effective working range of the reader/writer antenna.

　　Anti-collision unit: When multiple RFID smart cards enter the reader's operating range, the anti-collision unit will select one of them for operation, and the unselected one will be in idle mode and wait for the next card selection. The process will return to the selected card Serial number.

　　Logical control unit: used to decode the signal sent by the RFID reader and send data back to the RFID reader as required.

　　6. IC card reading and writing principle

　　The RFID reader/writer emits a set of electromagnetic waves with a fixed frequency to the RFID smart card. Under the excitation of the electromagnetic waves, the LC resonant circuit in the RFID smart card resonates, so that there is a charge in the capacitor. At the other end of the capacitor, a single unit is connected. The guided electronic pump sends the charge in the capacitor to another capacitor for storage. When the accumulated charge reaches 2V, this capacitor can be used as a power supply to provide working voltage for other circuits, transmit data in the card or receive RFID reading Writer's data. The realization of transmitting and receiving data through the voltage provided has become the most life-changing application of RFID technology in modern life.

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