xov xwm

NtawmPFC hloov cov khoom siv hluav taws xob, lub zog hloov hluav taws xob tswj fais fab mov yog ib qho tseem ceeb heev.Lub zog hloov hluav taws xob muaj nuj nqi hauv PFC tsis txawv ntau ntawm cov khoom siv hluav taws xob hloov pauv, tab sis muaj qhov sib txawv ntawm cov khoom siv hluav taws xob.Kev hloov pauv hluav taws xob ib txwm xav tau 220V rectifier fais fab mov, thaum PFC fais fab mov yog siv los ntawm B + PFC.

Tom qab rectification, tsis muaj lim capacitor ntxiv, thiab lub unfiltered pulsating zoo ib nrab-lub voj voog voltage yog siv raws li lub hwj chim mov ntawm lub chopper.Txij li thaum qhov zoo voltage ntawm lub chopper yog "taws" rau hauv lub waveform tam sim no, cov yam ntxwv ntawm lub waveform yog:
1. Lub waveform tam sim no tsis tu ncua, thiab nws lub hnab ntawv yog tib yam li qhov voltage waveform, thiab cov theem ntawm lub hnab ntawv thiab qhov voltage waveform yog tib yam.
2. Vim yog cov nyhuv ntawm chopping, ib nrab-pulsating DC lub zog dhau los ua high-frequency (txiav txim siab los ntawm kev txiav ntau zaus, txog 100khz) "AC" fais fab.Lub zog siab "AC" no yuav tsum tau kho dua ua ntej nws tuaj yeem tswj tau los ntawm PWM hloov tom qab siv fais fab.
3. Los ntawm kev pom dav dav ntawm cov khoom siv hluav taws xob sab nraud, lub zog hluav taws xob ua tiav tau hais tias AC voltage thiab AC tam sim no nyob rau theem thiab qhov hluav taws xob thiab cov nthwv dej tam sim no nyob rau hauv txoj kab nrog sinusoidal waveform, uas tsis tsuas yog daws qhov teeb meem ntawm lub hwj chim yam nyiaj them, tab sis kuj daws cov teeb meem ntawm electromagnetic compatibility thiab electromagnetic cuam tshuam.

Lub high-frequency "alternating tam sim no" lub hwj chim yog kho los ntawm lub rectifier diode thiab lim mus rau hauv ib tug ncaj tam tam sim no voltage thiab ces muab rau lub tom ntej no PWM hloov fais fab mov.Qhov hluav taws xob DC no tseem hu ua B + PFC.B + PFC voltage tso zis los ntawm cov chopper feem ntau siab dua +300V tom qab thawj 220 AC rectification thiab lim.Yog vim li cas yog tias cov kab hluav taws xob high-voltage raug xaiv, kab txoj kab uas hla ntawm inductor yog me me, thiab cov kab voltage poob me me.Lub peev xwm ntawm lub lim capacitor yog me me, thiab cov nyhuv lim dej yog qhov zoo, thiab muaj ntau yam zoo xws li cov kev xav tau qis rau qis qis PWM hloov raj.

Tam sim no, nyob rau hauv PFC hloov hluav taws xob qhov chaw, lub raj chopper uas ua haujlwm raws li kev hloov pauv muaj ob hom kev ua haujlwm:
1. Continuous conduction mode (CCM): Kev khiav hauj lwm zaus ntawm lub raj hloov mus tas li, thiab lub luag haujlwm ntawm kev hloov pauv nrog lub amplitude ntawm chopping voltage.
2. Discontinuous conduction hom (DCM): Kev khiav hauj lwm zaus ntawm lub chopper hloov raj hloov nrog qhov loj ntawm qhov chopping voltage.

CovPFC hloov hluav taws xobib feem thiab qhov excitation ntawm PWM switching fais fab mov ib feem nyob rau hauv lub hwj chim qhov tseem ceeb kho switching fais fab mov yog tag nrho cov ua tiav los ntawm ib tug integrated circuit, thiab ib tug tib IC tuaj yeem ua tiav qhov tsim.