Taw qhia rau Kev Ua Haujlwm ntawm y Capacitor hauv Kev Hloov Hluav Taws Xob
Y capacitors yog siv rau kev lim dej ntau hom, uas txuas nrog L thiab hauv av lossis N thiab hauv av los lim tawm cov hom kev sib txawv ntawm L rau hauv av lossis N rau hauv av. (Y capacitors feem ntau yog siv symmetrically) Lawv yog tag nrho cov kev ruaj ntseg capacitors
Ntawm qhov kawg ntawm cov khoom siv hluav taws xob AC, feem ntau yuav tsum tau ntxiv peb qhov kev nyab xeeb capacitors los cuam tshuam EMI ua cuam tshuam.
AC fais fab input yog muab faib ua peb terminals: nyob hlau (L), xoom xaim (N), thiab av xaim (G). Lub capacitance txuas nyob rau hauv parallel ntawm cov hlau nyob thiab hauv av xaim, nrog rau ntawm xoom xaim thiab av xaim, feem ntau hu ua Y capacitance. Txoj haujlwm txuas ntawm ob lub Y capacitors yog qhov tseem ceeb thiab yuav tsum ua raws li cov qauv kev nyab xeeb uas cuam tshuam los tiv thaiv cov khoom siv hluav taws xob los yog cov ntaub ntawv hluav taws xob, uas tuaj yeem ua rau muaj kev nyab xeeb ntawm tus kheej thiab lub neej yooj yim. Lawv tag nrho yog nyob rau hauv qeb ntawm kev ruaj ntseg capacitors, uas yuav tsum tau hais tias tus nqi capacitance yuav tsum tsis txhob loj heev thiab lub withstand voltage yuav tsum siab. Feem ntau, cov tshuab ua haujlwm nyob rau hauv cheeb tsam subtropical yuav tsum muaj cov av xau tam sim no tsis tshaj {{0}}.7mA; Ua haujlwm ntawm cov tshuab cua sov, nws yuav tsum tau ua kom cov dej ntws mus rau hauv av yuav tsum tsis pub tshaj 0.35mA. Yog li, tag nrho lub peev xwm ntawm Y capacitors feem ntau tsis tuaj yeem tshaj 4700PF (472).
Nws yog tshwj xeeb yog taw qhia hais tias raws li ib tug kev ruaj ntseg capacitor, Y capacitor yuav tsum tau txais ntawv pov thawj los ntawm lub koom haum soj ntsuam kev nyab xeeb. Cov tsos ntawm Y capacitors feem ntau yog txiv kab ntxwv lossis xiav, thiab lawv feem ntau raug cim nrog cov ntawv pov thawj kev nyab xeeb (xws li UL, CSA, thiab lwm yam) thiab cov lus 'tiv taus voltage AC250V lossis AC275V'. Txawm li cas los xij, nws qhov tseeb DC tiv taus qhov hluav taws xob tuaj yeem ncav cuag 5000V. Nws yuav tsum tau hais tias Y capacitors yuav tsum tsis txhob arbitrarily hloov los ntawm dog dig capacitors nrog nominal withstand voltage ntawm AC250V los yog DC400V.
Lub capacitance nyob rau hauv parallel ntawm kab nyob thiab xoom kab tsub kom feem ntau hu ua X capacitance. Vim qhov chaw tseem ceeb ntawm kev sib txuas ntawm capacitor, nws tseem yuav tsum tau ua raws li cov qauv kev nyab xeeb uas cuam tshuam. X capacitor kuj yog ib qho ntawm cov kev ruaj ntseg capacitor. Raws li qhov xav tau tiag tiag, tus nqi capacitance ntawm capacitor X tau tso cai kom loj dua li ntawm lub capacitor Y, tab sis lub sij hawm no, ib qho kev tiv thaiv kev nyab xeeb yuav tsum tau txuas mus rau qhov sib npaug ntawm ob qho kawg ntawm capacitor X txhawm rau tiv thaiv cov hlua hluav taws xob los ntawm kev siv hluav taws xob. rau lub sijhawm ntev vim qhov kev them nqi thiab kev tawm ntawm lub capacitor thaum unplugging. Raws li kev ruaj ntseg cov qauv, thaum lub hwj chim qaum ntawm lub tshuab ua hauj lwm yog unplugged, lub voltage (los yog hauv av muaj peev xwm) them ntawm ob kawg ntawm lub hwj chim qaum plug yuav tsum tsawg tshaj li 30 feem pua ntawm cov thawj rated ua hauj lwm voltage nyob rau hauv ob vib nas this.
Raws li ib qho ntawm cov kev ruaj ntseg capacitor, X capacitor kuj yuav tsum tau ntawv pov thawj los ntawm lub koom haum kuaj kev nyab xeeb. X capacitors feem ntau yog cim nrog cov ntawv pov thawj kev nyab xeeb thiab cov lus 'tiv taus voltage AC250V lossis AC275V', tab sis lawv qhov tseeb DC tiv taus hluav taws xob tuaj yeem ncav cuag 2000V lossis siab dua. Thaum siv lawv, tsis txhob siv cov capacitors zoo tib yam nrog nominal withstand voltage AC250V lossis DC400V li hloov.
Feem ntau, X capacitors feem ntau yog ua los ntawm polyester zaj duab xis capacitors nrog siab ripple tam sim no. Hom capacitor no muaj lub ntim loj dua, tab sis nws kuj tso cai rau qhov tam sim no loj rau kev them nyiaj tam sim thiab tawm, thiab nws cov kev tiv thaiv sab hauv yog me me. Lub ripple tam sim no ntsuas ntawm cov khoom siv hluav taws xob zoo tib yam tsawg heev, thiab cov dynamic sab hauv tsis kam yog siab. Hloov X capacitors nrog cov capacitors zoo tib yam tsis tsuas yog ua tsis tau raws li tus qauv rau lub capacitor tiv taus voltage, tab sis kuj ua rau nws nyuaj rau ripple tam sim no ntsuas kom tau raws li qhov yuav tsum tau ua.
