Peb feem ntau xav tias cov zis waveform ntawm lub hwj huam mov nrog PFC nquag yog sine yoj. Txawm li cas los xij, qhov tseeb, cov tswv yim tam sim no waveform ntawm lub hwj chim mov nrog PFC tsis yog ib qho zoo meej sine yoj. Hloov chaw, nws yog "kho sine yoj" lossis "pulsating DC nthwv dej" uas yog "them ua ke" los ntawm siab - zaus hloov pauv thiab ua raws li theem voltage hloov. Yog vim li cas nws tsis yog sine nthwv dej yog txiav txim siab los ntawm nws txoj haujlwm ua haujlwm.
Koj puas paub dab tsi yog lub luag haujlwm ntawm lub hwj chim mov PFC? Ib qho kev ua haujlwm yog Ua kom cov theem ntawm cov tswv yim tam sim no ua tau raws li theem ntawm cov input voltage (tshem tawm theem sib txawv thiab txhim kho lub zog); Lwm qhov yog Ncua kev sib haum xeeb hauv cov khoom siv tam sim no kom nws cov duab ze li sai tau rau sine yoj thiaj li ua tau raws li cov qauv siv hluav taws xob sib xws (xws li EN 61000).
Qhov tseem ceeb tshaj plaws yog PFC lub hom phiaj rau "hauv-theem" thiab "kev sib haum xeeb qis," tsis yog kev ua lej zoo meej sine yoj. Ntev npaum li qhov tam sim no waveform txaus "sinusoidal" thiab cov ntsiab lus sib haum xeeb yog qis dua tus qauv txwv, nws tsim nyog.
Nrog rau lub zog ua haujlwm PFC hloov hluav taws xob zoo li lub siab -ceev hloov dej twj tso kua mis. Txhawm rau kom tau txais lub zog ntawm AC lub zog hluav taws xob, nws yuav tsum tau kho AC rau DC ua ntej. Txoj kev daws teeb meem ntawm kev nce lub capacitor nyob rau hauv tus choj rectifier yuav ua rau tam sim no tsuas yog ua nyob ze ntawm qhov kawg ntawm qhov hluav taws xob, tsim cov ntse mem tes tam sim no (siab harmonics).
Peb paub lub hwj chim mov PFC, yuav ua li cas txog lub waveform? Nws lub waveform zoo li cas? Los ntawm qhov tsawg-frequency foundations: nws lub hnab ntawv yog sine yoj nyob rau hauv theem nrog cov input voltage. Qhov no yog qhov tshwm sim ntawm PFC nti tswj; Ntawm qhov siab - zaus teev: Lub hnab ntawv sinusoidal no yog tsim los ntawm suav tsis txheeb siab - zaus sawtooth lossis daim duab peb sab tsis txuas ua ke. Txhua sawtooth sib raug rau ib lub voj voog hloov PFC. Qhov tam sim no nce thaum lub qhov hloov pauv thiab poob thaum lub qhov hloov pauv, ua rau siab - zaus ripple.Yog tias oscilloscope muaj bandwidth siab txaus, cov siab no - zaus hloov ripples tuaj yeem pom tau meej meej superimposed ntawm 50Hz / 60Hz qhov tseem ceeb zaus nrog rau qhov kev ntsuas ntawm FC.Yog li ntawd, cov khoom siv hluav taws xob tam sim no. nws tsis yog ib tug du sine yoj, qhov no feem ntau yog ib txwm.Tab sis yuav ua li cas evulate PFC Circuit Court zoo? Muaj ob lub ntsiab lus tseem ceeb: ib qho yog seb lub hwj chim ntawm lub hwj chim yog ntau tshaj 0.9 los yog tsis? Lwm qhov yog seb THD tsawg dhau sai li sai tau, xws li tsawg dua 10%.
Ntev npaum li ob qhov ntsuas no ua tau raws li qhov yuav tsum tau ua, PFC Circuit Court ua tiav thiab ua raws txawm tias muaj siab - zaus hloov ripple nyob rau hauv daim ntawv yoj tam sim no. Cov ripples no tuaj yeem ua kom zoo ntxiv siv cov khoom siv lim inductor (ib feem ntawm EMI lim), tab sis tsis tuaj yeem thiab tsis tas yuav tshem tawm tag nrho.
Yog li yog tias qhov hloov hluav taws xob hloov hluav taws xob tso tawm waveform tsis yog qhov zoo tshaj plaws sine yoj, koj tsis xav tias dc fais fab mov tsis zoo, koj yuav tsum tau kuaj xyuas lub hwj huam mov fais fab nqi (PF tus nqi) thiab THD.
Zoo siab txais tos hu rau kuv kom paub ntau ntxiv txog kev hloov hluav taws xob, peb yog cov chaw tsim khoom ntawm cov khoom siv hluav taws xob, thiab peb zoo siab los muab kev txhawb nqa rau koj.
