一种无连接通信的高可靠性光幕保护系统

A High Reliability Light Curtains Protection System of Connectionless Communication

光幕是一种依靠红外发射接收的高可靠性安全保护装置,文中设计一种无连接的简单通信、快速移位接收的光幕保护系统。光幕由两个单片机分别控制接收端和发射端,由最上端的两对发射和接收管完成接收端和发射端的同步工作,代替原有的通信线连接方式。系统采用一对多的红外发射和接收的方式,红外发射端的红外发射管按照一定的顺序依次发光,红外接收端在接收方式上采用一次性并行存储接收信号、然后串行输出接收信号给单片机,提高了系统速度。系统还具有差错冗余功能,能判断是否为误触发信号,并且若任意不相邻的两个管子被挡住或坏掉后,系统还可以恢复正常工作状态;另外通过电路与结构设计,使系统具有很强的抗干扰能力。通过测试表明该系统响应时间快、可靠性高。

The reliability of light curtain plays a very important role, as light curtain gurantee the safety in the system of elevator. It is try ing to design a system with wireless communication. Use two chips on both side of transmiting and receiving part to replace the original one chip. Instead of using the original communication line, two series of emitters and receivers were made to complete the synchronous work. The emitter lightened in an order while the receiver part absorbs signals disposably, named as a mode of one to many, was adopted. The singals will be storaged parallelly and output in a serial, which can improve the storage speed highlyr Function of error redundancy is also used in the system, so it can recover to the normal condition when any two nonadjacent tubes were blocked or broken. Besides,de- signed specific circuit and structure to improve the ability of electromagnetic interference and stray light interference. The test result shows that this system is of high speed and high reliability.