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双向晶闸管（TRIAC）是一种电子元件，它相当于两个单向晶闸管反向并联而成[1]。不过双向晶闸管对于两个单向晶闸管而言它只有一个门极，它通过一个门极就能正常工作，而且更容易设计触发电路，设备的体积也能减小、重量也能减轻。
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