Kev faib tawm thiab kev siv ntawm Linear DC Regulated Power Supplies
I. Kev txhais thiab kev faib tawm ntawm DC Regulated Power Supply
DC tswj fais fab mov tseem hu ua DC voltage regulator. Feem ntau ntawm nws cov khoom siv hluav taws xob yog AC voltage, thiab cov zis hluav taws xob ncaj qha ntawm lub tshuab hluav taws xob hluav taws xob tuaj yeem nyob ruaj khov thaum qhov hluav taws xob ntawm AC muab hluav taws xob los yog cov khoom siv hluav taws xob hloov pauv. Cov tsis muaj voltage regulator yog voltage stability, ripple yam thiab teb ceev. Tus qub qhia txog cov txiaj ntsig ntawm kev hloov pauv hauv qhov input voltage ntawm cov zis voltage. Ripple coefficient qhia tau hais tias nyob rau hauv cov kev ua haujlwm nyob rau hauv qhov ntsuas, qhov loj ntawm AC tivthaiv ntawm cov zis voltage; tom kawg qhia tau hais tias thaum lub input voltage los yog load hloov drastic, lub sij hawm yuav tsum tau rau lub voltage rov qab mus rau lub qub tus nqi. DC tswj fais fab mov muab faib ua ob pawg ntawm kev txuas txuas ntxiv thiab hloov pauv. Tus qub los ntawm kev lag luam zaus transformer rau ib-theem lossis peb-theem AC voltage rau qhov tsim nyog tus nqi, thiab tom qab ntawd kho, lim, kom tau txais ib qho tsis ruaj khov DC fais fab mov, thiab tom qab ntawd los ntawm qhov hluav taws xob tswj hluav taws xob kom tau txais qhov ruaj khov voltage (los yog tam sim no).
Cov kab hluav taws xob no yooj yim, me me ripple, kev sib cuam tshuam me me, tab sis qhov ntim loj, siv tau ntau dua, kev ua haujlwm tsawg (feem ntau tsawg dua 40% txog 60%). Lub tom kawg los hloov qhov hloov pauv (lossis hloov) ntawm lub sijhawm sib piv los tswj cov zis hluav taws xob, thiaj li ua tiav kev tswj hwm hluav taws xob. Hom kev siv hluav taws xob siv hluav taws xob no me me, qhov ua tau zoo tuaj yeem ncav cuag 85% lossis yog li ntawd, tab sis qhov tsis zoo yog qhov ripple loj, kev cuam tshuam kev sib tshuam. Yog li ntawd, kev loj hlob sai heev txij li xyoo 80s.
DC tswj fais fab mov tuaj yeem muab faib ua los ntawm kev ua haujlwm:
(1) controllable rectifier hom. Kho cov zis voltage los ntawm kev hloov lub sij hawm conduction ntawm thyristor.
(2) Chopper hom. Cov tswv yim yog tsis ruaj tsis khov DC voltage, hloov qhov sib piv ntawm qhov sib txawv ntawm qhov hloov pauv kom tau txais unidirectional pulsating DC, thiab tom qab ntawd lim kom tau txais qhov ruaj khov DC voltage.
(3) Hloov hom. Tsis ruaj tsis khov DC voltage yog thawj zaug hloov mus rau hauv high-frequency alternating tam sim no los ntawm inverter, thiab tom qab ntawd los ntawm transformer, rectifier, filtering, los ntawm cov tshiab DC tso zis voltage sampling, tawm tswv yim tswj ntawm inverter zaus, mus cuag lub hom phiaj ntawm ruaj khov tso zis DC voltage. .
Qhov thib ob, kev siv DC tswj fais fab mov
AC tswj fais fab mov yog siv rau hauv computer thiab nws cov khoom siv peripheral, cov cuab yeej siv kho mob hluav taws xob, kev sib txuas lus thiab cov khoom siv tshaj tawm, cov khoom siv hluav taws xob, cov kab ntau lawm tsis siv neeg thiab lwm yam khoom siv high-tech niaj hnub ntawm kev tswj hluav taws xob thiab kev tiv thaiv.
DC tswj fais fab mov yog siv dav hauv kev tiv thaiv hauv tebchaws, kev tshawb fawb tshawb fawb, tsev kawm qib siab thiab tsev kawm qib siab, chaw soj nstuam, kev lag luam thiab kev lag luam mining, electrolysis, electroplating, them cov khoom siv thiab lwm yam DC fais fab mov.
(1) tuaj yeem siv rau ntau yam khoom siv hluav taws xob laus, xws li PCB pawg thawj coj saib kev laus, cov khoom siv hauv tsev laus, txhua yam khoom siv IT aging, CCFL aging, teeb aging
(2) Muaj feem xyuam rau qhov xav tau rau lub sijhawm tsis siv neeg lub zog rau thiab tawm, tsis siv neeg kaw lub voj voog ntawm cov khoom siv hluav taws xob ntawm kev laus, kev sim
(3) Electrolytic capacitor mem tes aging
(4) Resistors, relays, motors thiab lwm yam kev sim thiab kev laus
(5) Tag nrho lub tshuab kev laus; Electronic Cheebtsam kev ua tau zoo, kev kuaj niaj hnub.
