Zero-crossing trigger of SCR is a common problem in the practical application of SCR, especially in three-phrase systems.
在可控硅的实际应用中，经常会遇到可控硅过零触发问题，尤其在三相系统中，这种应用更为常见。
The hardware circuit is simple, and it has strong reliance and anti-interference ability, which is a kind of ideal SCR trigger.
硬件电路简单，可靠性高，抗干扰能力强，是一种比较理想的晶闸管触发装置。
It is perfect phase trigger circuit for arc welding power source of SCR.
该相控触发电路是晶闸管整流弧焊电源的理想触发电路。
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