Vim li cas LEDs Flicker Thiab Yuav Ua Li Cas Tso Nws
LEDs flicker thaum lawv lub teeb tso zis hloov pauv. Qhov kev hloov pauv no tshwm sim vim tias koj qhov dimmable lub teeb-emitting diodes yog tsim los hloov thiab tawm ntawm qhov kub ceev.
Muaj ob lub laj thawj tseem ceeb vim li cas qhov muag pom strobo tuaj yeem hnov:
1. Cov zis ripple zaus yog tsawg. Nyob rau hauv cov xwm txheej tshwj xeeb (piv txwv li, tam sim ntawd nkag mus rau thaj chaw teeb pom kev los ntawm thaj chaw tsis muaj teeb), koj kuj yuav hnov lub suab ntawm 100Hz. Cov yeeb yaj kiab qub tus nqi yog 24fps, tab sis yog tias qhov zaus ntawm lub teeb pom kev yog Lub flash zaus nyob ib puag ncig 60Hz, thiab txhua tus neeg tsis tuaj yeem sawv. Khoos phis tawj saib thiab TVs tshem tawm cov txheej txheem qub ncej thiab nws yooj yim to taub.
2. Tso zis ripple voltage los yog tam sim no 100Hz tso zis ripple, thaum lub ripple voltage yog tsawg tshaj li 5%, nws tsis xav tias stroboscopic. Lub sijhawm no, ripple tam sim no yuav tsawg dua 5%, thiab kev siv zog me ntsis. Tus ncej tus nqi ntawm lub xov tooj ntawm tes lossis lub koob yees duab feem ntau yog nyob ib ncig ntawm 30, thiab lub koob yees duab nrawm nrawm tuaj yeem ncav cuag 400fps. Kev tua nrog lub teeb strobe, yog tias qhov zaus strobe tsis tuaj yeem tshaj 4 npaug ntawm tus ncej tus nqi teev los ntawm cov cuab yeej tua, koj yuav pom lub teeb flashing lossis txawm tias tshee ntawm cov cuab yeej tua, thiab cov txiaj ntsig ntawm kev tua kuj zoo ib yam. Yog li ntawd, thaum tua cov zaub ntawm lub qub CRT saib, koj yuav pom qhov bar txav mus. Qhov tsawg zaus stroboscopic, txawm hais tias peb tsis tuaj yeem hnov nws tam sim ntawd, tab sis nyob rau hauv xws li lub teeb ntev, tib neeg nkees heev, yooj yim rau myopia thiab lwm yam kab mob ntawm qhov muag.
Tam sim no, LED fais fab mov tuaj yeem ua tau raws li qhov xav tau ntawm tsis muaj stroboscopic:
1. Ua kom cov zis electrolytic capacitor
2. Kev siv lub kwj ha filling passive PFC scheme
3. Kev siv ob-theem txheej txheem (AC / DC, DC / DC)
Thawj lub tswv yim "ua kom cov zis electrolytic capacitor", lub tswv yim no tuaj yeem siv lub tshuab hluav taws xob electrolytic kom nqus tau ib feem ntawm AC ripple, tab sis qhov kev paub tiag tiag qhia peb tias thaum kev tswj ripple nyob rau hauv qee qhov ntau (10%), Nws yog. nyuaj ntxiv kom txo tau nws, tshwj tsis yog tias cov electrolytic capacitor ntxiv rau tus nqi yam tsis muaj nqi.
Qhov thib ob txoj kev yog siv lub hav-filled passive PFC scheme, uas kuj yog qhov tseem ceeb tshaj plaws kev kho mob. Cov phiaj xwm kev rho tawm tuaj yeem siv cov tub ntxhais kawm lossis IWATT (qhov kev daws teeb meem ntxov tshaj plaws, uas tam sim no tau raug tshem tawm ntau). Ob lub capacitors loj thiab peb lub diodes yog siv rau kev kho lub zog. Vim hais tias muaj ib tug loj electrolytic capacitor tom qab tus choj rectifier, AC ripple yog absorbed, thiab tam sim no los ntawm inductor los yog transformer mus rau theem nrab yog DC.
Qhov thib peb txoj kev yog los txais yuav ib lub tswv yim ob-theem. Los ntawm kev ntxiv DC / DC rau cov khoom siv hluav taws xob uas twb muaj lawm ntawm peb lub tuam txhab, qhov cuam tshuam ntawm AC ripple tuaj yeem raug tshem tawm tag nrho. Cov hluav taws xob tsis muaj peev xwm kuj tuaj yeem ua tau raws li cov qauv ntawv pov thawj. Txawm li cas los xij, qhov kev daws teeb meem no muaj qee yam nce nqi. Nws yuav tsum muaj kev tswj hwm lub zog ntxiv thiab qee cov khoom siv hluav taws xob peripheral, thiab tag nrho cov nqi yuav nce ntxiv.