Raws li lub xeev ua hauj lwm ntawm lub hloov raj, peb feem ntau faib cov tswj fais fab mov rau hauv ob pawg: linear tswj fais fab mov thiab switching tswj fais fab mov. Tsis tas li ntawd, muaj lub zog me me uas siv lub raj Zener.
Cov kab hluav taws xob tswj hluav taws xob tau hais los ntawm no yog hais txog DC tswj fais fab uas lub raj hloov ua haujlwm hauv lub xeev linear. Lub raj hloov ua haujlwm nyob rau hauv lub xeev linear, uas tuaj yeem nkag siab tau raws li hauv qab no: RW (saib qhov kev tshuaj ntsuam hauv qab no) yog qhov sib txawv tsis tu ncua, uas yog, linear. Nyob rau hauv lub switching fais fab mov, nws txawv. Lub raj xa hluav taws xob (hauv kev hloov pauv hluav taws xob, peb feem ntau xa mus rau lub raj hloov kho raws li lub raj hloov pauv) ua haujlwm nyob rau hauv ob lub xeev: rau thiab tawm: on - qhov tsis kam yog me me; tawm - qhov tsis kam yog siab loj heev. Lub raj ua haujlwm nyob rau hauv lub xeev hloov yog pom tseeb tsis nyob rau hauv ib lub xeev linear.
Linear regulated fais fab mov yog ib hom DC tswj fais fab mov siv ua ntej. Cov yam ntxwv ntawm linear regulated DC fais fab mov yog: cov zis voltage yog qis dua qhov input voltage; cov lus teb ceev ceev, cov zis ripple yog me me; lub suab nrov tsim los ntawm kev ua haujlwm tsawg; qhov ua tau zoo yog tsawg (LDO uas feem ntau pom tam sim no tshwm los daws qhov teeb meem kev ua haujlwm); Lub tshav kub yog qhov loj (tshwj xeeb tshaj yog cov khoom siv hluav taws xob siab), uas tsis ncaj qha ntxiv cov suab nrov thermal rau lub cev.
Qhov sib txawv ntawm cov resistor RW thiab cov load resistor RL tsim ib qho hluav taws xob faib hluav taws xob, thiab cov zis hluav taws xob yog:
Uo=Ui × RL/(RW ntxiv rau RL), yog li los ntawm kev kho qhov loj ntawm RW, qhov loj ntawm qhov tso zis voltage tuaj yeem hloov pauv. Nco ntsoov tias hauv cov qauv no, yog tias peb tsuas saib tus nqi hloov pauv ntawm qhov hloov pauv hloov RW, cov zis ntawm Uo tsis yog linear, tab sis yog peb saib RW thiab RL ua ke, nws yog linear. Kuj tseem nco ntsoov tias peb daim duab tsis kos lub davhlau ya nyob twg RW rau sab laug, tab sis sab xis. Txawm hais tias tsis muaj qhov txawv ntawm cov qauv, nws yog kos rau ntawm txoj cai, tab sis nws tsuas yog qhia txog lub tswv yim ntawm "sampling" thiab "feedback" - feem ntau ntawm cov khoom siv hluav taws xob tiag tiag ua haujlwm nyob rau hauv hom qauv thiab cov lus qhia hauv qab no, kev siv feedforward txoj kev yog tsis tshua muaj, los yog txawm siv, nws tsuas yog ib tug pab txoj kev.
Cia peb mus ntxiv: Yog tias peb siv lub triode lossis field effect transistor los hloov lub varistor hauv daim duab, thiab tswj qhov kev tiv thaiv ntawm qhov "varistor" los ntawm kev kuaj xyuas qhov loj ntawm qhov tso zis voltage, kom cov zis voltage nyob twj ywm, ces peb muaj. Lub hom phiaj ntawm voltage stabilization yog tiav. Qhov no triode lossis field effect transistor yog siv los kho cov zis hluav taws xob, yog li nws yog hu ua lub raj hloov.
