Txoj Cai Ua Haujlwm ntawm Linear Regulated Power Supply
Cov kab hluav taws xob ruaj khov hluav taws xob raug xa mus rau ntawm no yog hais txog DC stabilized fais fab mov uas cov kav dej tswj tau ua haujlwm nyob rau hauv lub xeev linear. Kho lub raj mus ua haujlwm hauv lub xeev linear tuaj yeem nkag siab raws li hauv qab no: RW (saib kev tshuaj ntsuam hauv qab) yog qhov sib txawv tsis tu ncua, uas yog, linear. Hauv cov khoom siv hluav taws xob hloov pauv, txawm li cas los xij, nws txawv. Lub raj hloov pauv (hauv cov khoom siv hluav taws xob hloov hluav taws xob, peb feem ntau xa mus rau qhov hloov pauv raws li lub raj hloov pauv) ua haujlwm nyob rau hauv ob lub xeev: on - nrog tsawg heev tsis kam; Tawm - qhov tsis kam yog siab heev. Lub raj ua haujlwm hauv lub xeev qhib / tawm yog pom tseeb tsis nyob rau hauv lub xeev linear.
Linear stabilized fais fab mov yog ib hom DC stabilized fais fab mov uas tau siv thaum ntxov. Cov yam ntxwv ntawm cov kab hluav taws xob tswj DC fais fab mov yog: cov zis hluav taws xob qis dua qhov hluav taws xob input; Cov lus teb ceev ceev thiab cov zis me me ripple; Tsawg suab nrov tsim los ntawm kev ua haujlwm; Tsawg efficiency (LDO, uas feem ntau pom niaj hnub no, yog tsim los daws cov teeb meem efficiency); Kev tsim hluav taws xob siab, tshwj xeeb tshaj yog los ntawm cov khoom siv hluav taws xob siab, tsis ncaj qha ntxiv cov suab nrov thermal rau lub cev.
Lub hauv paus ntsiab lus ntawm kev ua haujlwm: Cia peb xub siv daim duab hauv qab no los qhia txog lub hauv paus ntsiab lus ntawm kev tswj qhov hluav taws xob hauv cov khoom siv hluav taws xob linear regulator.
Uo=Ui × RL/(RW + RL), yog li los ntawm kev kho qhov loj ntawm RW, cov zis hluav taws xob tuaj yeem hloov pauv. Thov nco ntsoov tias hauv qhov sib npaug no, yog tias peb tsuas saib qhov kev hloov pauv ntawm tus nqi 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. Tsis tas li ntawd nco ntsoov tias peb daim duab tsis piav qhia txog RW cov hlau lead kawg li txuas rau sab laug, tab sis sab xis. Txawm hais tias tsis muaj qhov sib txawv tseem ceeb ntawm cov qauv, daim duab ntawm sab xis zoo kawg nkaus qhia txog cov ntsiab lus ntawm "sampling" thiab "feedback" - qhov tseeb, feem ntau ntawm cov khoom siv hluav taws xob ua haujlwm hauv cov qauv thiab cov lus tawm tswv yim, thiab cov tswv yim feedforward tsis tshua siv. los yog tsuas yog siv raws li txoj kev pab.
Cia peb mus txuas ntxiv: yog tias peb hloov qhov hloov pauv hloov pauv hauv daim duab nrog lub transistor lossis qhov cuam tshuam ntawm cov transistor, thiab tswj qhov kev tawm tsam ntawm qhov "tsis paub meej resistor" los ntawm kev txheeb xyuas cov zis hluav taws xob kom tswj tau qhov hluav taws xob tas li, peb yuav ua tiav lub hom phiaj ntawm qhov hluav taws xob. ruaj khov. Qhov no transistor los yog field-effect transistor yog siv los kho qhov voltage tso zis loj, yog li nws yog hu ua kho transistor.
Vim lub fact tias lub regulating raj yog sib npaug rau ib tug resistor, nws generates tshav kub thaum tam sim no ntws los ntawm lub resistor. Yog li ntawd, kev tswj cov raj ua haujlwm nyob rau hauv ib lub xeev linear feem ntau ua kom muaj cua sov ntau, uas ua rau muaj kev ua haujlwm tsawg. Qhov no yog ib qho ntawm cov teeb meem tseem ceeb 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, thov mus saib hauv phau ntawv qhia ntawm analog hluav taws xob circuits. Peb lub hom phiaj tseem ceeb ntawm no yog los pab txhua tus kom paub meej cov ntsiab lus no thiab lawv txoj kev sib raug zoo.
