Isiqalo esithambileiyinoveli idivayisi yokulawula imoto ehlanganisa isiqalo esithambile semoto, isitobhi esithambile, ukonga amandla okukhanya kanye nemisebenzi eminingi yokuvikela.Okuyinhloko kwayo kwakhiwe ama-thyristors ahambisana nezigaba ezintathu ahlehlayo kanye nesekethe yokulawula ye-elekthronikhi exhunywe ochungechungeni phakathi kokunikezwa kwamandla kanye nenjini elawulwayo.Sebenzisa izindlela ezihlukene ukuze ulawule i-conduction angle ye-thyristors ehambisana nezigaba ezintathu ukuze i-voltage yokufaka yemoto elawulwayo ishintshe ngokuvumelana nezidingo ezahlukene, futhi kufezeke imisebenzi ehlukene.

Ngokusetshenziswa okwandayo kwezinjini ezinkulu (5000kW～60000kW)amabhizinisi amakhulu kanye nemishini, indlela yokuqala yamamotho amakhulu anayobaye bakhangwa kakhulu.Ngenxa yokusebenza okuphansi kwedivayisi eqala uketshezi ayikwazi ukuhlangabezana nezidingo zokuqala zamamotho amakhulu, ukusetshenziswa kohlobo lwe-thyristor (isimo esiqinile) amadivaysi okuqala athambile aseqalile ukwanda.Bese-ke ukushintsha izisetshenziswa zokuqalisa ezithambile zohlobo lwe-transformer kanye nama-reactors amagnetic saturation (alawulwa ngozibuthe) amadivaysi okuqalisa kanye namadivayisi okuguqula imvamisa asetshenziswa kakhulu ekuqaleni okuthambile kwamamotho.Njengamanje, amadivaysi okuqalisa uketshezi asetshenziswa kakhulu kumamotho amancane (ngaphansi kuka-5000kW).Futhi uchungechunge lwe-thyristorisiqalo esithambilezisetshenziswa kakhulu ezinjinini zamandla aphezulu (ngaphezu kuka-5000KW).