地磁车辆检测器防非正常触发设计

Design of Guarding Against Unusually Triggers of Earth Vehicles Detector

论述了传统地磁车辆检测器的工作原理,分析了其非正常触发的3种情况.针对这3种情况,对相应电路进行了改进,提出了RC积分电路的一种新的用法,使用RC积分电路和与非门一起形成一个延时控制开关,从而实现了车辆检测器的防非正常触发设计.采用RC积分电路的防非正常触发设计方案后,地磁车辆检测器性能稳定,环境适应能力强,克服了单片机电路无法适应瞬间掉电、雷雨、强电磁干扰等恶劣环境的情况.

This article first elaborates the work principle of the traditional earth magnetism vehicles detector, analyzes three kinds of situations which it unnsually triggers. Then in view of these three kinds of situations, this article makes some improvement to the corresponding electric circuits. One new usage of the RC integrated circuit is proposed, which uses the RC integrated circuit and the NAND gate to form a timing control switch together, thus realizes the design of guarding against, unusually triggers of the vehicles detector. Using the design proposal of the RC integrated circuit to guard against unnsually triggers, the performance of this system is stable, the ability of adapting environment is strong, and therefore many adverse circumstance situations such as the monolithic integrated circuit electric circuit is unable to adapt instantaneous falls the electricity, the thunderstorm, the strong electromagnetic interference and so on are overcome.