Isimiso esisebenzayo sokungeniswa okuncibilikisa izesekeli zomlilo: i-thyristor

Enqubeni yokusebenza ye- ntombikayise T, i-anode A ne-cathode K yayo ixhunywe ekunikezelweni kwamandla nomthwalo ukwakha isifunda esikhulu se-thyristor, futhi isango G no-cathode K we-thyristor axhumene nedivayisi yokulawula i-thyristor ukwenza isifunda sokulawula ithristristor.

Izimo zokusebenza ze-thyristor:

1. Lapho i-thyristor yakho inamandla we-anode voltage, i-thyristor ivulwa kuphela lapho isango linamandla kagesi avumayo. Ngalesi sikhathi, i-thyristor isesimweni sokuqhubela phambili, okuyisici se-thyristor’s thyristor, esingalawulwa.

2. Lapho i-thyristor ivuliwe, inqobo nje uma kukhona i-anode voltage ethile evumayo, kungakhathalekile amandla esango, i-thyristor ihlala ivuliwe, okungukuthi, ngemuva kokuthi i-thyristor ivuliwe, isango liphelelwa umsebenzi. Isango lisebenza njenge-trigger kuphela

3. Lapho i-thyristor ivuliwe, lapho i-voltage yesekethe enkulu (noma yamanje) yehla ukuvala iqanda, i-thyristor iyacisha.

4. Lapho i-thyristor ithwala i-reverse anode voltage, noma ngabe isango lithwala muphi ugesi, i-thyristor isesimweni esivimba emuva.

Esithandweni semvamisa esiphakathi nendawo, isikhathi sokuvala se-rectifier singaphakathi kwe-KP-60 microseconds, kanti uhlangothi lwe-inverter lucisha isikhashana phakathi kwama-microseconds we-KK-30. Lokhu futhi ngumehluko omkhulu phakathi kwamashubhu e-KP ne-KK. I-Thyristor T yi-anode yayo ngesikhathi sokusebenza. I-A ne-cathode K zixhunywe ekunikezelweni kwamandla nomthwalo ukwakha isifunda esikhulu se-thyristor. Isango G no-cathode K we-thyristor axhumene nedivayisi yokulawula i-thyristor ukwakha isekethe yokulawula i-thyristor.

Kusuka ekuhlaziyweni kwangaphakathi kwenqubo yokusebenza kwe-thyristor: I-thyristor iyidivayisi enezingqimba ezine ezintathu zokugcina. Inezinhlaka ezintathu ze-PN, i-J1, i-J2, ne-J3. Umdwebo 1. I-NP phakathi ingahlukaniswa izingxenye ezimbili ukwakha i-transistor yohlobo lwe-PNP ne-transistor yohlobo lwe-NPN. Umdwebo 2 Lapho i-thyristor ithwala i-anode voltage enhle, ukuze yenze i-thyristor iqhube ithusi, i-PN junction J2 ethwala i-voltage ebuyela emuva kufanele ilahlekelwe umphumela wayo wokuvimba. Iqoqo lamanje le-transistor ngayinye esithombeni futhi liyi-base yamanje yenye i-transistor.

Ngakho-ke, lapho kunegebe lamanje le-Ig elanele ukugeleza kumasekhethi amabili ahlanganisiwe, kuzokwakhiwa impendulo enhle, okwenza ukuthi ama-transistor amabili agcwale futhi aqhutshwe, futhi ama-transistor agcwele futhi aqhutshwe. Ake sithi umqoqi wamanje webhubhu le-PNP nethubhu ye-NPN ahambelana ne-Ic1 ne-Ic2; i-emitter yamanje ihambelana ne-Ia ne-Ik; i-coefficient yamanje yokukhulisa ihambelana no-a1 = Ic1 / Ia no-a2 = Ic2 / Ik, nesigaba esibuyela emuva esigeleza kuhlangana kwe-J2 Okwamanje ukuvuza yi-Ic0, futhi i-anode yamanje ye-thyristor ilingana nesamba samanje seqoqo namandla okuvuza wamashubhu amabili: Ia = Ic1 Ic2 Ic0 noma Ia = a1Ia a2Ik Ic0 Uma igebe lamanje lingu-Ig, i-thyristor cathode yamanje iyi-Ik = Ia Ig, ngakho-ke Kungaphethwa ngokuthi i-anode yamanje ye-thyristor : I = (Ic0 Iga2) / (1- (a1 a2)) (1-1) Ama-coefficients ahambisanayo wamanje wokukhulisa u-a1 no-a2 wethubhu le-silicon PNP kanye neshubhu le-silicon NPN lilingana ne-emitter yamanje Ushintsho noshintsho olubukhali kukhonjisiwe kuMdwebo 3.

Lapho i-thyristor inamandla we-anode voltage futhi isango lingaphansi kwamandla kagesi, kwifomula (1-1), Ig = 0, (a1 a2) incane kakhulu, ngakho-ke i-anode yamanje ye-thyristor Ia≈Ic0 ne i-thyristor ivaliwe ngokufanelekile Esimeni sokuvimba. Lapho i-thyristor ikumandla we-anode voltage, i-Ig yamanje igeleza isuka esangweni G. Njengoba i-Ig enkulu ngokwanele igeleza lapho kuhlangana khona ithubhu yeNPN tube, i-amplification factor factor a2 yanda, futhi i-Ic2 yamanje enkulu igeleza ithubhu le-PNP. Iphinde inyuse isici sokukhulisa samanje a1 sephubhu ye-PNP, futhi ikhiqize i-Ic1 yamanje enkulu ye-elektroni egeleza lapho kuhlangana khona ithubhu yeNPN.

Inqubo enjalo eqinile yokuthola impendulo iqhubeka ngokushesha.

Lapho i-a1 ne-a2 inyuka nge-emitter yamanje ne (a1 a2) ≈ 1, i-denominator 1- (a1 a2) ≈ 0 kwifomula (1-1), ngaleyo ndlela yandisa i-anode yamanje Ia ye-thyristor. Ngalesi sikhathi, igeleza ngeThe current of thyristor inqunywa ngokuphelele amandla wesekethe omkhulu kanye nokumelana kwesifunda. I-thyristor isivele isesimweni sokuqhuba phambili. Kwifomula (1-1), ngemuva kokuthi i-thyristor ivuliwe, 1- (a1 a2) -0, noma ngabe isango lamanje Ig = 0 ngalesi sikhathi, i-thyristor isengagcina i-anode yangempela i-Ia yamanje futhi iqhubeke nokuqhuba .

Ngemuva kokuthi i-thyristor ivuliwe, isango liphelelwe ngumsebenzi. Ngemuva kokuthi i-thyristor ivuliwe, uma amandla okuhambisa ugesi ancipha ngokuqhubekayo noma ukwandiswa kwe-loop kwandiswa ukunciphisa i-anode yamanje Ia ibe ngaphansi kwe-IH yamanje, ngoba i-a1 ne-a1 yehla ngokushesha, lapho i-1- (a1 a2) ≈ 0 , I-thyristor ibuyela esimweni sokuvimba.