P0912YH

发布时间:2016-11-14

P0912YH 

P0912YH 

P0912YH 

 晶闸管由截止到导通需要在控制极上加以一定的触发信号,触发信号可以是直流、交流信号或脉冲信号,但通常使用的都是脉冲信号,

  4.1 晶闸管对触发电路的基本要求

  1) 触发信号应有足够的触发功率(电压和电流),一般触发电压为4-10V,触发电流为几十到几百毫安,因此要求脉冲变压器初级直流电源电压不小于15V左右(一般为18-24V)

  2) 控制极平均功率不PG不能过允许值,对于5A的晶闸管应小于0.5W,10-50A的小于1W等。

  3) 触发脉冲应有足够的宽度,因为晶闸管的开通时间约为6us,故触发脉冲宽度不能小于6us。

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