Cov capacitors ua lub luag haujlwm tseem ceeb hauv kev muab hluav taws xob, feem ntau yog siv los ua kom lub zog hluav taws xob tso tawm du thiab lim cov suab nrov hluav taws xob. Los ntawm kev khaws lub zog hluav taws xob ib ntus thiab tso nws tawm thaum muaj kev thov ntau, cov capacitors pab tswj kom muaj lub zog tso tawm ruaj khov thiab huv. Lub luag haujlwm no yog qhov tseem ceeb hauv kev txo qhov cuam tshuam ntawm kev hloov pauv hluav taws xob thiab suab nrov, uas tuaj yeem cuam tshuam rau kev ua haujlwm thiab lub neej ntev ntawm cov khoom siv hluav taws xob.
Tsis tas li ntawd xwb, cov capacitors hauv cov khoom siv fais fab pab tswj kev hloov pauv tam sim ntawd ntawm cov khoom siv tam sim no. Thaum ib lub cuab yeej siv hluav taws xob ntau dua, lub capacitor muab cov tam sim no tsim nyog yam tsis muaj qhov poob qis ntawm qhov hluav taws xob, ua kom ntseeg tau tias qhov khoom siv fais fab tseem ruaj khov. Lub peev xwm no yog qhov tseem ceeb tshwj xeeb hauv cov ntawv thov uas qhov hluav taws xob ruaj khov yog qhov tseem ceeb, xws li hauv cov khoom siv suab nrov lossis cov voj voog digital meej, tiv thaiv lawv ntawm kev puas tsuaj vim muaj qhov tsis sib xws ntawm lub zog.
Ntxiv mus, hauv kev hloov pauv fais fab, cov capacitors pab txhawb nqa kev tswj hwm ntawm cov zaus hloov pauv thiab pab txhawb rau hauv cov txheej txheem hloov pauv zog. Lawv lub luag haujlwm ntawm no yog ob npaug: thawj zaug, lawv txo qhov zog poob thaum lub sijhawm hloov pauv los ntawm kev khaws cia ib ntus, thiab qhov thib ob, lawv ua kom cov zis ntawm lub zog muab hluav taws xob du kom tiv thaiv kev cuam tshuam hauv lub voj voog. Qhov kev ua haujlwm ob npaug no tsis yog tsuas yog txhim kho kev ua haujlwm ntawm lub zog muab hluav taws xob xwb tab sis kuj txhim kho kev ua haujlwm tag nrho ntawm lub cuab yeej nws muab hluav taws xob, kom ntseeg tau tias lub zog siv tau zoo thiab ua haujlwm tau zoo.
Cov capacitors electrolytic aluminium uas tsis ua haujlwm zoo yuav muaj cov teebmeem tsis zoo rau cov circuits hluav taws xob. Cov kws kho tshuab feem ntau tau pom cov cim qhia txog zaj dab neeg - bulging, tshuaj xau, thiab txawm tias cov saum toj kawg nkaus uas tau tawg tawm. Thaum lawv ua haujlwm tsis zoo, cov circuits uas muaj lawv tsis ua haujlwm raws li tsim - feem ntau cuam tshuam rau cov khoom siv fais fab. Piv txwv li, lub capacitor uas ua haujlwm tsis zoo tuaj yeem cuam tshuam rau DC output theem ntawm DC fais fab mov vim tias nws tsis tuaj yeem lim tau qhov hluav taws xob rectified pulsating raws li xav tau. Qhov no ua rau qhov nruab nrab DC voltage qis dua thiab ua rau muaj kev coj cwj pwm tsis sib xws vim yog ripple tsis xav tau - piv rau qhov xav tau DC voltage huv ntawm lub load. Piv txwv li, hauv qab no qhia txog lub zog linear noj qab haus huv. Raws li koj tuaj yeem pom, qhov tso zis (Kab Ntsuab) yog qhov hluav taws xob DC huv nrog ripple qis heev. Ripple yog AC Cheebtsam tsis xav tau uas lub capacitor xav tau los lim lossis (du). Ntawm ntug nce ntawm qhov rectified waveform (hauv xim av), lub capacitor them. Ntawm ntug poob, lub zog khaws cia hauv lub capacitor muab hluav taws xob txaus rau lub load kom khi nws mus txog ntug nce tom ntej.
Piv txwv tom ntej no qhia txog tib lub hwj chim nrog lub capacitor lim dej uas tsis ua haujlwm. Vim tias ESR (Equivalent Series Resistance) ntawm lub capacitor tau nce ntxiv, lub voj voog tsis ua haujlwm raws li tsim. Qhov no ua rau muaj ob yam tshwm sim. Nws zoo li yog tias muaj ib qho resistor ntxiv tau muab tso rau hauv series nrog lub capacitor. Tsis tas li ntawd, thaj chaw ntawm cov phaj capacitor tau txo qis - txo qhov capacitance. Yog li ntawd, es tsis txhob lim tawm qhov AC ripple tsis xav tau, qhov ripple ntawd tshwm sim thoob plaws ob qho tib si resistive Cheebtsam tshiab hauv lub cev capacitor nrog rau qhov capacitance txo qis. Qhov no ua rau muaj qhov hluav taws xob tsis huv (Kab Ntsuab) nrog qib DC qis dua qhov xav tau rau lub nra. Yog li thaum lub zog rectified (hauv ntshav) nce, lub capacitor tsis tuaj yeem khaws cia txaus ntawm lub zog ntawd - yog li ntawm ntug poob, qhov hluav taws xob tso zis (hauv ntsuab) tsuas yog poob rau qib txo qis.
Feem ntau hloov lub capacitor daws qhov teeb meem no. Lub voj voog tuaj yeem ua haujlwm raws li tsim - lim tawm lub zog hluav taws xob tsis xav tau thiab xa lub zog hluav taws xob DC huv si rau lub nra. Tab sis vim li cas cov hau no thiaj li tsis ua haujlwm? Yuav ua li cas thiaj li tiv thaiv qhov no? Koj yuav ua li cas thiaj li tiv thaiv qhov no kom tsis txhob rov tshwm sim? Rau ib qho, cov capacitors electrolytic muaj lub neej txwv. Feem ntau cov aluminium electrolytic capacitors tau lees tias yuav kav ntev li 1000 - 10,000 teev ntawm lawv qhov kub thiab txias, nyob ntawm lub peev xwm thiab lub zog. Rau cov khoom siv fais fab uas khiav 24/7 (xws li cov khoom siv hauv cov khoom siv uas muab lub zog rau lub pob "on"), qhov no txhais tau tias 42 hnub txog 1 1/2 xyoos. Lub neej tag nrho kuj nyob ntawm lub nra uas lub zog muab hluav taws xob nyob hauv qab, qhov kub thiab txias ib puag ncig lub capacitor (lawv tuaj yeem kav ntev dua li qhov kub thiab txias ua haujlwm txo qis), thiab lub voj voog ua haujlwm ntawm kev siv (muaj pes tsawg teev / hnub uas lub zog muab hluav taws xob tau energized). Qhov kub thiab txias ua haujlwm siab yog ib qho laj thawj uas cov electrolytic capacitors yog ib qho ntawm cov khoom tsis ua haujlwm feem ntau hauv cov khoom siv hluav taws xob.
Tsab xov xwm los ntawm: https://qr.ae/pCWki4
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-26-2025