晶閘管（Thyristor）是晶體閘流管的簡稱，又可稱做可控硅整流器，以前被簡稱為可控硅；公司開發出世界上晶閘管產品，并于1958年使其商業化；晶閘管是PNPN四層半導體結構，它有三個極：陽極，陰極和門極；晶閘管工作條件為：加正向電壓且門極有觸發電流；其派生器件有：快速晶閘管，雙向晶閘管，逆導晶閘管，光控晶閘管等。它是一種大功率開關型半導體器件，在電路中用文字符號為“V”、“VT”表示（舊標準中用字母“SCR”表示）。晶閘管具有硅整流器件的特性，能在高電壓、大電流條件下工作，且其工作過程可以控制、被廣泛應用于可控整流、交流調壓、無觸點電子開關、逆變及變頻等電子電路中。

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