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 hluav taws xob, peb feem ntau hu rau lub raj hloov kho lub raj hloov) 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); Kev tsim hluav taws xob loj (tshwj xeeb tshaj yog cov khoom siv hluav taws xob muaj zog) tsis ncaj qha ua rau lub suab nrov nrov rau lub cev.
Lub hauv paus ntsiab lus ua haujlwm: Peb thawj zaug siv cov duab hauv qab no los qhia txog lub hauv paus ntsiab lus ntawm kev tswj hluav taws xob ntawm cov kab hluav taws xob tswj hluav taws xob. Raws li pom nyob rau hauv daim duab hauv qab no, qhov sib txawv resistor RW thiab load resistor RL tsim ib qhov hluav taws xob faib hluav taws xob Circuit Court, thiab cov zis voltage yog:
Uo="Ui" × RL/(RW plus 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 sib 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" - qhov tseeb fais fab mov, feem ntau ntawm lawv ua hauj lwm nyob rau hauv hom sampling thiab tawm tswv yim hauv qab no. kev siv cov txheej txheem feedforward tsis tshua muaj, los yog txawm siv, nws tsuas yog ib txoj kev pab xwb.
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 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.
Txij li thaum lub regulating raj txuas nyob rau hauv series ntawm lub hwj chim mov thiab lub load, nws yog hu ua ib tug series tswj fais fab mov. Raws li txoj cai, kuj tseem muaj cov khoom siv hluav taws xob sib xyaw ua ke, uas yog txhawm rau kho qhov tso zis hluav taws xob los ntawm kev sib txuas cov kav dej tswj kev sib txuas nrog cov khoom thauj. Tus neeg siv khoom raug cai TL431 yog tus tswj hwm shunt. Qhov kev sib txuas hu ua parallel txhais tau hais tias, zoo li Zener raj hauv daim duab 2, qhov "ruaj khov" voltage ntawm attenuating amplifier raj lub emitter yog guaranteed los ntawm shunt. Tej zaum daim duab no tsis tuaj yeem cia koj pom tias nws yog "parallel" ib zaug, tab sis yog tias koj saib ze, nws ua tau. Txawm li cas los xij, txhua tus neeg yuav tsum tau ua tib zoo saib ntawm no: lub raj Zener ntawm no siv nws thaj chaw uas tsis yog-linear ua haujlwm, yog li yog tias nws raug suav tias yog lub zog hluav taws xob, nws kuj yog lub zog tsis muaj hluav taws xob. Txhawm rau pab txhawb txhua tus neeg nkag siab, cia peb rov qab mus rau ntawm daim duab tsim nyog kom txog thaum peb tuaj yeem nkag siab qhov tseeb.
Txij li thaum lub raj hloov yog sib npaug rau cov resistor, thiab cov tam sim no ntws los ntawm cov resistor, nws yuav tsim kom muaj cua sov, yog li cov raj hloov kho uas ua haujlwm nyob rau hauv lub xeev linear feem ntau yuav ua kom muaj cua sov ntau, uas ua rau muaj kev ua haujlwm tsawg. Qhov no yog qhov tsis zoo ntawm cov khoom siv hluav taws xob linear tswj. Yog xav paub ntxiv txog kev nkag siab ntau ntxiv ntawm cov khoom siv hluav taws xob linear, saib phau ntawv qhia ntawm analog hluav taws xob circuits. Ntawm no peb tsuas yog pab koj kom paub meej cov ntsiab lus thiab kev sib raug zoo ntawm lawv.
Feem ntau hais lus, linear tswj fais fab mov yog tsim los ntawm ob peb yam yooj yim xws li kev hloov lub raj, siv hluav taws xob, piv txwv Circuit Court, thiab yuam kev amplifier circuit. Tsis tas li ntawd, nws kuj tseem yuav suav nrog qee qhov xws li kev tiv thaiv circuits, pib-up circuits thiab lwm yam. Cov duab hauv qab no yog ib qho yooj yim schematic daim duab ntawm linear tswj fais fab mov (schematic daim duab, omitting Cheebtsam xws li lim capacitors). Lub sampling resistor kuaj cov zis voltage thiab muab piv nrog rau qhov siv voltage. Tom qab kev sib piv cov txiaj ntsig tau nthuav dav los ntawm qhov yuam kev amplifier Circuit Court, lub raj hloov kho yog tswj. Lub degree ntawm conduction ua rau cov zis voltage ruaj khov.
