分布电容对施密特触发器与RC微分电路构成的多谐振荡电路的影响  

Effect of distributed capacitance on multivibrator circuit composed of Schmitt trigger and RC differential circuit

作　　者：张维维[1] 朱保峰[1] 钱力[1] 杨勇[1] 

机构地区：[1]中国电子科技集团公司第四十九研究所,黑龙江哈尔滨150001

出　　处：《传感器世界》2017年第8期33-36,共4页Sensor World

摘　　要：由多谐振荡器构成的交流电路在传输信号时,微小的电容量变化,可能会严重影响电路工作。描述了实验室废液收集器检测电路误报警的故障现象。依据检测装置的结构和工作原理,结合实验数据和仿真结果,分析并得出导致故障产生的原因为不同连接状态分布电容的差异,并给出分布电容的构成。针对如何弱化分布电容的影响,给出了解决措施。实测结果表明,对电缆屏蔽皮接电源地可以消除241p F分布电容。Small change of capacitance may affect the work of AC circuits composed of multivibrators seriously in process of signal transmission. The phenomena of false alarm happened in detection circuits of waste liquid collectors in laboratories is described in this paper According to the structure and working principle of the detection circuits, combined with the experimental data and simulation results, the cause analyzed and given, which is different of the failure is connection state leading to the difference of distributed capacitance, and the composition of distributed capacitance is given The solution is presented for weakening the influenceof distributed capacitance. Experimental results show that 241pF distributed capacitance can be eliminated by grounding the cable shield.

关 键 词：多谐振荡器 交流电路 分布电容 故障现象 

分 类 号：TM13[电气工程—电工理论与新技术]