可控硅，是可控硅整流元件的简称，是一种具有三个PN 结的四层结构的大功率半导体器件，亦称为晶闸管。
具有体积小、结构相对简单、功能强等特点，是比较常用的半导体器件之一。
该器件被广泛应用于各种电子设备和电子产品中，多用来作可控整流、逆变、变频、调压、无触点开关等。
家用电器中的调光灯、调速风扇、空调机、电视机、电冰箱、洗衣机、照相机、
组合音响、声光电路、定时控制器、玩具装置、无线电遥控、摄像机及工业控制等都大量使用了可控硅器件。
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