智能型可控硅低频电源系统中的零电流检测电路

The circuit of detecting zero - current in intelligent SCR AC - AC low frequency power system

在矿井提升系统中,低频电源被广泛应用于提升的减速、爬行阶段,大大地提高了提升系统的运行效率和安全性。简单介绍了智能型可控硅低频电源系统的工作原理,并主要针对系统中的零电流检测问题,应用高速光耦合元件6N137设计了零电流检测电路,给出了高速光耦合元件6N137的结构和工作原理。该电路缩短了检测的时间,并提高了检测的准确性,使系统的输出性能得到很大的改善。

The AC hoist system in the coal mine, low frequency supply system is applied in the braking and the creeping periods, improving greatly running efficiency and security. The paper introduces the work principle of the intelligent SCR AC- AC low frequency, applying the high - speed optocoupler 6N137 and present the work principle and the inside structure of the 6N137.The circuit of detecting zero - current is designed to solve the problem of detecting. The circuit shortens the time and improves veracity of detecting zero - current, advances greatly the performance of the system.