西瑪可控硅晶閘管N1463CH38 N3476TC380
工作過(guò)程編輯
晶閘管是四層三端器件，它有J1、J2、J3三個(gè)PN結(jié)圖1，可以把它中間的NP分成兩部分，構(gòu)成一個(gè)PNP型三極管和一個(gè)NPN型三極管的復(fù)合管
當(dāng)晶閘管承受正向陽(yáng)極電壓時(shí)，為使晶閘管導(dǎo)通，必須使承受反向電壓的PN結(jié)J2失去阻擋作用。因此，兩個(gè)互相復(fù)合的晶體管電路，當(dāng)有足夠的門極電流Ig流入時(shí)，就會(huì)形成強(qiáng)烈的正反饋，造成兩晶體管飽和導(dǎo)通，晶體管飽和導(dǎo)通。
設(shè)PNP管和NPN管的集電極電流相應(yīng)為Ic1和Ic2；發(fā)射極電流相應(yīng)為Ia和Ik；電流放大系數(shù)相應(yīng)為a1=Ic1/Ia和a2=Ic2/Ik，設(shè)流過(guò)J2結(jié)的反相漏電電流為Ic0,
晶閘管的陽(yáng)極電流等于兩管的集電極電流和漏電流的總和：
Ia=Ic1+Ic2+Ic0或Ia=a1Ia+a2Ik+Ic0
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