摘要
该文分析了晶闸管三相交流调压光耦隔离驱动电路中的过触发现象,即以自然换相点为起点,当触发脉冲大于120时,输出电压有效值可能骤然增加的现象。过触发现象可能造成异步电机失控,从而带来破坏性影响。该文通过理论分析、仿真及实验,分析了过触发现象的原因,并给出了避免过触发现象的控制方法。
This paper analyzes over trigger phenomenonfor opto--isolated thyristor AC-voltage regulator,which meansfrom the starting point（natural phase change point）, when trigger pulseis greater than 120.7, the output voltage RMS may suddenly increase. Over trigger may cause out of control on asynchronous motors, leading to devastating effects.By theoretical analysis, simulationand experiments,this article analyzes the causes of the over trigger phenomenon, and gives control methods to avoid it.
出处
《科技资讯》
2014年第33期90-91,94,共3页
Science & Technology Information
基金
Supported by Dalian Science and Technology Fund
2013J21DW005
关键词
晶闸管
光耦隔离
过触发
Thyristor
Opto--Isolated
Over trigger
