西瑪可控硅晶閘管R0717LS16J R0717LS16H
工作過程編輯
晶閘管是四層三端器件，它有J1、J2、J3三個PN結圖1，可以把它中間的NP分成兩部分，構成一個PNP型三極管和一個NPN型三極管的復合管
當晶閘管承受正向陽極電壓時，為使晶閘管導通，必須使承受反向電壓的PN結J2失去阻擋作用。因此，兩個互相復合的晶體管電路，當有足夠的門極電流Ig流入時，就會形成強烈的正反饋，造成兩晶體管飽和導通，晶體管飽和導通。
設PNP管和NPN管的集電極電流相應為Ic1和Ic2；發射極電流相應為Ia和Ik；電流放大系數相應為a1=Ic1/Ia和a2=Ic2/Ik，設流過J2結的反相漏電電流為Ic0,
晶閘管的陽極電流等于兩管的集電極電流和漏電流的總和：
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