Yadda za a gane sarrafawa ta hanyar SCR (thyristor)?

Babban amfani na yau da kullun na masu gyara siliki mai sarrafa shi shine gyare-gyaren sarrafawa. Da’irar gyara diode da aka sani shine da’irar gyara da ba za a iya sarrafawa ba. Idan an maye gurbin diode da madaidaicin siliki mai sarrafawa, ana iya ƙirƙirar da’irar gyara mai sarrafawa. Ina zana mafi sauƙi-lokaci guda ɗaya mai iya sarrafa da’irar gyarawa. A lokacin ingantaccen zagayowar rabin ƙarfin wutar lantarki na sinusoidal AC U2, idan sandar sarrafawa na VS bai shigar da bugun bugun jini Ug ba, har yanzu VS ba za a iya kunna ba. Sai kawai lokacin da U2 ke cikin madaidaiciyar rabin zagayowar kuma ana amfani da bugun bugun bugun jini Ug zuwa sandar sarrafawa, thyristor yana kunna don kunna . Zana tsarin motsinsa, zaku iya ganin cewa kawai lokacin da bugun bugun bugun Ug ya zo, fitowar wutar lantarki UL akan nauyin RL. Ug yana zuwa da wuri, kuma an kunna SCR da wuri; Ug ya zo a makare, kuma an kunna SCR a makare. Ta hanyar canza lokacin isowar bugun bugun bugun jini Ug akan sandar sarrafawa, ana iya daidaita matsakaicin ƙimar UL (yankin ɓangaren shaded) na ƙarfin fitarwa akan kaya. A cikin aikin injiniyan lantarki, rabin zagayowar alternating current ana saita shi azaman 180°, wanda ake kira kusurwar lantarki. Ta wannan hanyar, a cikin kowane madaidaiciyar rabin sake zagayowar U2, kusurwar lantarki da aka samu daga ƙimar sifili zuwa lokacin bugun bugun bugun jini ana kiranta kusurwar sarrafawa α; kusurwar lantarki wanda thyristor ke gudanarwa a cikin kowane rabin zagayowar tabbatacce ana kiransa angle conduction θ. Babu shakka, ana amfani da duka α da θ don nuna sarrafawa ko toshe kewayon thyristor a lokacin rabin zagaye na ƙarfin lantarki na gaba. Ta hanyar canza kusurwar sarrafawa α ko kusurwar gudanarwa θ, matsakaicin darajar UL na ƙarfin wutar lantarki na pulse DC akan kaya yana canzawa, kuma ana samun gyara mai sarrafawa.