Yuav ua li cas kho lub LED flicker?

Vim tias peb yuav tsum paub qhov twg ntawm lub teeb pom kev zoo yuav tsum tau txhim kho lossis hloov, peb tau hais tias nws tseem ceeb npaum li cas los txheeb xyuas qhov chaw ntawm lub flicker (nws puas yog AC fais fab lossis PWM?).

Yog tiasLED STRIPyog qhov ua rau lub flicker, koj yuav tsum tau hloov nws tawm rau ib tug tshiab uas yog ua kom du tawm AC zog thiab hloov mus rau hauv ib tug tiag tiag ruaj khov DC tam sim no, uas yog ces siv los tsav lub LEDs. Nrhiav "flicker dawb” cov ntawv pov thawj thiab kev ntsuas flicker thaum xaiv ib qho LED sawb tshwj xeeb:

Qhov sib piv sib txawv ntawm qhov siab tshaj plaws thiab qhov ci tsawg kawg nkaus (amplitude) hauv lub voj voog flicker yog qhia raws li tus qhab nia feem pua ​​hu ua "flicker feem pua." Feem ntau, lub teeb ci ntsa iab flickers ntawm 10% thiab 20%. (vim nws cov ntaub ntawv khaws cia qee qhov ntawm nws cov cua sov thaum lub sijhawm "khiav" hauv AC teeb liab).

Flicker Index yog ib qho kev ntsuas uas ntsuas tus nqi thiab lub sijhawm ntawm lub sijhawm uas lub LED tsim lub teeb ntau dua li niaj zaus thaum lub voj voog flicker. Lub flicker Performance index ntawm lub teeb incandescent yog 0.04.

Tus nqi ntawm lub voj voog flicker rov ua nws tus kheej ib ob yog lub npe hu ua flicker zaus thiab qhia hauv hertz (Hz). Vim qhov zaus ntawm AC teeb liab, feem ntau ntawm LED teeb yuav ua haujlwm ntawm 100-120 Hz. Zoo sib xws flicker thiab flicker index theem yuav muaj tsawg dua ntawm kev cuam tshuam ntawm qhov muag teev nrog ntau zaus vim lawv lub sijhawm hloov pauv sai.

Ntawm 100-120 Hz, feem ntau ntawm LED qhov muag teev flicker. IEEE 1789 pom zoo kom 8% kev nyab xeeb ("kev pheej hmoo tsawg") flicker ntawm qhov zaus no, thiab 3% kom tshem tawm tag nrho cov teebmeem flicker.

Koj tseem yuav tau hloov lub PWM dimmer unit yog PWM dimmer lossis maub los yog flicker qhov ua rau. Cov xov xwm zoo yog tias txij li cov strips LED lossis lwm yam khoom tsis zoo li yuav yog qhov chaw ntawm lub flicker, tsuas yog PWM dimmer lossis tus tswj yuav tsum tau hloov.

Thaum tab tom nrhiav kev daws teeb meem tsis muaj flicker PWM, xyuas kom meej tias muaj qhov qhia meej meej qhov ntsuas vim tias qhov no tsuas yog siv tau PWM flicker metric (vim nws feem ntau yog ib qho teeb liab nrog 100% flicker). Peb xav kom PWM zaus ntawm 25 kHz (25,000 Hz) lossis siab dua rau PWM cov tshuaj uas tsis muaj flicker tiag tiag.

Qhov tseeb, cov qauv zoo li IEEE 1789 qhia tias PWM qhov chaw teeb pom kev zoo nrog lub zaus ntawm 3000 Hz yog qhov muaj zog txaus kom txo tau qhov cuam tshuam ntawm flicker. Txawm li cas los xij, ib qho txiaj ntsig ntawm kev nce qhov zaus siab dua 20 kHz yog tias nws tawm mus nrog lub peev xwm rau cov khoom siv hluav taws xob los tsim cov suab nrov nrov lossis suab nrov. Yog vim li cas rau qhov no yog qhov siab tshaj plaws audible zaus rau cov neeg feem coob yog 20,000 Hz, yog li los ntawm kev qhia ib yam dab tsi ntawm 25,000 Hz, piv txwv li, koj tuaj yeem zam qhov ua rau muaj kev ntxhov siab lossis lub suab nrov nrov, uas tuaj yeem ua teeb meem yog tias koj tshwj xeeb yog rhiab lossis yog tias koj daim ntawv thov yog suab-rhiab heev.