Cov khoom siv hluav taws xob DC linear thiab hloov cov khoom siv hluav taws xob muaj qhov sib txawv hauv qab no
Linear Power Supply
Lub ntsiab Circuit Court ntawm linear fais fab mov yog raws li nram no:
Ntawd yog, ~ 220V mains tswj los ntawm SCR tsuas yog ib feem ntawm thawj transformer nyob rau hauv lub ntsiab transformer. Thaum cov zis voltage Uo siab dua, SCR conduction lub kaum sab xis loj dua, feem ntau ntawm cov mains voltage los ntawm SCR "tso", thiab yog li qhov voltage ntxiv rau lub transformer thawj, uas yog, Ui siab dua, uas tau kawg rectified thiab lim cov zis voltage. yog tus siab heev.
Thaum cov zis voltage Uo tsawg heev, SCR conduction lub kaum sab xis me me, feem ntau ntawm cov mains voltage los ntawm SCR "daim ntawv txiav tawm", tsuas yog ib tug tsawg voltage ntxiv rau lub transformer thawj, uas yog, Ui yog heev. tsawg, uas tau kawg, lub rectifier lim cov zis voltage kuj tsawg heev.
Tam sim no ntau lawm ntawm switching fais fab mov siv nyob rau hauv ib tug ntau yam ntawm PWM integrated nti, mas los ntawm cov zis voltage variation ntau yog me me, cov zis tam sim no yog ruaj khov taw tes ntawm view rau tus tsim.
Tab sis lub npe hu ua PWM nti, yog mem tes dav modulator, thaum cov zis voltage siab dua, cov zis tam sim no loj dua, lub hwj huam mov sab hauv lub raj tig lub sij hawm ntev dua thiab lub sij hawm tig tawm yog luv dua:
Yog tias qhov tso zis hluav taws xob thiab tam sim no tseem poob qis, cov kev cai ntawm kev tswj cov mem tes txuas ntxiv nqaim, tab sis PWM Circuit Court tsis tuaj yeem ua tau raws li, tom qab ntawd Circuit Court ua haujlwm tsis sib xws, xws li:
Pulse los ntawm ib lub sij hawm, tawg, lub hwj chim mov yuav tawm suab nrov, ripple, thiab lwm yam yuav ua tau loj, tsis zoo hluav taws xob kev ua tau zoo, lub thiaj li hu ua "low-end instability", qhov tseeb, tau dhau los ua ib tug substandard khoom. Yuav kom daws tau qhov teeb meem no, peb lub tuam txhab yuav siv cov kev ntsuas tshiab los daws kom tau zoo dua (tsis muaj cov ntsiab lus ntxiv).
Linear power supply thiab switching power supply piv
1, linear fais fab mov qhov tseeb yog qhov zoo (zoo dua li kev hloov fais fab mov 1-3 kev txiav txim ntawm qhov loj), ripple yog me me, qhov kev hloov pauv tau zoo, kev cuam tshuam sab nraud me me, siv tau rau ntau lub sijhawm.
2, cov khoom siv hluav taws xob tawm hluav taws xob ua haujlwm nyob rau hauv lub xeev linear, yog li qhov poob yog qhov siab ntawm cov khoom siv hluav taws xob hloov hluav taws xob, qhov ua tau zoo ntawm cov khoom siv hluav taws xob hloov tau zoo dua.
3, qhov loj ntawm cov khoom siv hluav taws xob hloov pauv piv rau cov khoom siv hluav taws xob linear yog qhov me me, tab sis lub zog hloov hluav taws xob muaj teeb meem ntawm kev ua qias tuaj ntawm daim phiaj hluav taws xob thiab amplitude cuam tshuam.
4, switching fais fab mov tsis haum rau kev siv nyob rau hauv cov zis ntawm high voltage thiab siab tam sim no thaum lub 0-voltage pib adjustable tsis tu ncua adjustable zaus, tab sis yog haum rau taag tso zis los yog tsau tso zis nyob rau hauv lub sij hawm ntawm hluav taws xob cuam tshuam. tsis loj dhau lawm.
5, kev saib xyuas ntawm cov khoom siv hluav taws xob linear yog qhov yooj yim los tswj. Hloov cov khoom siv hluav taws xob vim yog cov tshuaj tuab, coj qee qhov nyuaj hauv kev saib xyuas. Tsis tas li ntawd, vim hais tias lub voj voog sib txawv heev ntawm cov khoom siv hluav taws xob tawm, kev ua haujlwm zoo ntawm cov neeg ua haujlwm tu yuav tsum muaj qib siab ntawm oscilloscope los saib xyuas lub voj voog ntawm ntau qhov chaw ntawm lub xeev ua haujlwm.
