苏州创芯奇半导体有限公司
晶闸管特性可控硅
为了能够直观地认识的工作 特性,大家先看这块示教板(图3)。晶闸管VS与小灯泡EL串联起来,通过开关S接在直流电源上。注意阳极A是接电源的,阴极K接电源的负极,控制极G通过按钮开关SB接在1.5V直流电源的正极(这里使用的是KP1型晶闸管,若采用KP5型,应接在3V直流电源的。晶闸管与电源的这种连接方式叫做正 向连接,也就是说,给晶闸管阳极和控制极所加的都是合上电源开关S,小灯泡不亮,说明没有导通;再按一下按钮开关S,给控制极输入一个触发电压,小灯泡亮了,说明晶闸管导通了。这个演示实验给了我们什么启发呢?
这个实验告诉我们,要使晶闸管,一是在它的阳极A与阴极K之间外加正向电压,二是在它的控制极G与阴极K之间输入一个正向触发。晶闸管导通后,松开按钮开关,去掉触发电压,仍然维持导通。
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