范文编号:JD591 范文字数:16529,页数:42 [摘要] 本文从机械锁的“互开”问题引出了一种新型的更加安全可靠的锁——电子密码锁,分析了其特点和市场前景,并具体介绍了两种电子密码锁。一种是基于电路的电子密码锁,该密码锁的特点是,如果按错了密码键顺序或按下了任何一个非密码键,电路锁定为关断状态,各按键均失效,大大增加了开锁难度。另一种是基于74LS112双JK触发器构成的数字逻辑电路的电子密码锁。74LS112双JK触发器构成的数字逻辑电路控制方案是应用较为广泛的一种逻辑电路,这种电路以其易学易用的精简理论,低廉的价格,使开发商能以低成本、短周期、高报酬获得从价格、性能到保密性均占优势的高技术含量电子产品。文中介绍的第二种电子密码锁就是以74LS112双JK触发器构成的数字逻辑电路为核心的性价比高的电子产品。针对用户输入密码时密码易被盗的现象,本文引入了保密字符输入装置,使任何人都无法从偷窥或摄像中的按键字符获得密码。
A Kind of Electronic Cipher Lock [Abstract] A kind of new-type safe and more reliable lock which is called the electron chipher lock has been drawn from the problem of" opening each other" of the mechanical lock .This paper has analysed its characteristics and market prospects, introduced two kinds of electron chipher lock .One kind is based on circuit,whose characteristics is that if the key order of electron chipher lock is pressed wrongly ,the circuit is locked as the state of shutting of.The other kind is based on 74LS112 JK trigger a double-digital logic circuits which has simplify order collection with their easy to learn and cheap price which makes the developer able to get the dominant high-tech content electronic product from price, performance to privacy with low cost, short period, high return.At last,this paper has gived the improvement of electron chipper lock. [Key words] Rate of opening each other;electron cipher lock;Interference bond;sleepmode 目录
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