Ungakhetha kanjani kahle izingxenye ze-inverter ukuchithwa kwesithando somlilo

Ngokuvamile, ngaphansi kwezimo zokusebenza ezingaphezu kuka-400HZ, amadivaysi e-KK kufanele acatshangelwe; lapho imvamisa ingaphezulu kuka-4KHz, amadivayisi we-KA angacatshangelwa. Lapha sethula ikakhulukazi ukukhethwa kwezingxenye kumjikelezo we-inverter parallel (bheka Umfanekiso 1).

(1) Ingxenye eya phambili nephezulu ye-voltage ephezulu ye-VDRM, ingxenye ye-VRRM eya phambili kanye ne-reverse peak voltage kufanele ibe izikhathi ezingu-1.5-2 ubukhulu bangempela bangempela bevolthi eya phambili kanye ne-reverse peak voltage. Ngokucabanga ukuthi i-voltage yokufaka ye-DC ye-inverter i-Ud futhi isici samandla sithi cosψ, khona-ke:

VDRM/RRM=(1.5-2)πUd/(2cosψ)

(2) I-IT yamanje ye-IT (AV) elinganiselwe kuhulumeni wengxenye icabangela ukuthi uma ingxenye isebenza ngemvamisa ephezulu, ukulahlekelwa kwayo kokushintsha kubaluleke kakhulu. Isilinganiso esikuso isimo samanje sengxenye kufanele sigeleze izikhathi ezingu-2-3 inani layo elisebenzayo I ngokwangempela Ukuze kucatshangelwe, okungukuthi

I-IT(AV)=(2-3)I/1.57

Uma sicabanga ukuthi i-inverter DC input current yi-Id, idivayisi ekhethiwe ye-IT(AV) iyi

I-IT(AV)=(2-3)×Id/(1.57)

(3) Isikhathi sokuvala tq Kuseyingi ye-inverter ehambisanayo, isikhathi sokucisha sesici se-KK kufanele sikhethwe ngokuya nge-pre-trigger time tf kanye nesikhathi sokushintsha u-tr. Ngokuvamile thatha:

tq=(tf-tr)×

(Lapho isici samandla singu-0.8, i-tf cishe iyingxenye eyodwa kweshumi yenkathi, i-tr inqunywa isici esithi di/dt esingaphansi noma esilingana no-100A/μS) Uma i-frequency iphezulu, isikhathi sokushintsha esingu-tr singancishiswa futhi okunikelwe ngokufanele Indlela yesici samandla sokwandisa i-tf ukuze ukhethe izingxenye ezinenani elifanele le-tq