Diode vs SCR
Ob lub diode thiab SCR (Silicon Controlled Rectifier) yog cov khoom siv semiconductor nrog P hom thiab N hom semiconductor txheej. Lawv siv nyob rau hauv ntau daim ntawv thov kev hloov hluav taws xob. Ob lub cuab yeej muaj cov terminals hu ua 'anode' thiab 'cathode' tab sis SCR muaj qhov txuas ntxiv hu ua 'gate'. Ob qho khoom siv no muaj qhov zoo ntawm daim ntawv thov.
Diode
Diode yog cov khoom siv hluav taws xob yooj yim tshaj plaws thiab nws muaj ob txheej txheej semiconductor (ib P-hom thiab ib hom N-hom) txuas rau ib leeg. Yog li ntawd, diode yog PN kev sib tshuam. Diode muaj ob lub terminals hu ua anode (p-hom txheej) thiab cathode (n-hom txheej).
Diode tso cai tam sim no ntws los ntawm nws tsuas yog hauv ib qho kev taw qhia uas yog anode rau cathode. Qhov kev taw qhia ntawm tam sim no yog cim rau ntawm nws lub cim ua tus xub taub hau. Txij li thaum diode txwv qhov tam sim no mus rau ib qho kev taw qhia xwb, nws tuaj yeem siv los ua rectifier. Tag nrho tus choj rectifier Circuit Court uas yog ua los ntawm plaub diodes tuaj yeem kho qhov hloov tam sim no (AC) mus rau qhov tam sim no ncaj qha (DC).
Lub diode pib ua tus neeg xyuas pib thaum lub zog me me tau siv rau hauv kev coj ntawm anode rau cathode. Qhov kev poob qis no (paub tias yog qhov kev poob qis rau pem hauv ntej) yog ib txwm muaj thaum muaj qhov tam sim no tshwm sim. Qhov voltage no feem ntau yog 0.7V rau ib txwm silicon diodes.
Silicon Controlled Rectifier (SCR)
SCR yog hom thyristor thiab siv dav hauv cov ntawv thov kho tam sim no. SCR yog ua los ntawm plaub alternating semiconductor txheej (nyob rau hauv daim ntawv ntawm P-N-P-N) thiab yog li ntawd muaj peb PN junctions. Hauv kev tshuaj xyuas, qhov no suav hais tias yog ib qho sib txuas ua ke ntawm BJTs (ib qho PNP thiab lwm yam hauv NPN teeb tsa). Sab nraud P thiab N hom semiconductor txheej yog hu ua anode thiab cathode feem. Electrode txuas rau sab hauv P hom semiconductor txheej yog hu ua ' rooj vag'.
Hauv kev ua haujlwm, SCR ua haujlwm thaum muab lub mem tes rau lub rooj vag. Nws ua haujlwm ntawm 'on' lossis 'off' xeev. Thaum lub rooj vag tau tshwm sim nrog lub mem tes, SCR mus rau lub xeev 'on' thiab txuas ntxiv mus txog thaum lub sijhawm tam sim no dhau los ua tsawg dua qhov pib hu ua 'tuav tam sim no'.
SCR yog lub cuab yeej hluav taws xob thiab feem ntau nws siv rau hauv cov ntawv thov uas muaj qhov cuam tshuam loj thiab qhov hluav taws xob. Daim ntawv thov SCR siv tshaj plaws yog tswj (rectifying) alternating currents.
Qhov txawv ntawm BJT thiab SCR yog dab tsi?
1. Diode tsuas muaj ob txheej ntawm semiconductor, qhov SCR muaj plaub txheej ntawm lawv.
2. Ob lub terminals ntawm diode hu ua anode thiab cathode, whereas SCR muaj peb terminals hu ua anode, cathode thiab rooj vag
3. SCR tuaj yeem suav tau tias yog mem tes tswj diode hauv kev tshuaj xyuas.
4. SCR tuaj yeem ua haujlwm ntawm qhov hluav taws xob siab dua thiab tam sim no dua li diodes.
5. Kev tuav fais fab yog qhov zoo dua rau SCRs dua li diodes.
6. Lub cim ntawm SCR yog muab los ntawm kev ntxiv lub rooj vag davhlau ya nyob twg rau lub cim ntawm diode.
