Yuav kho qhov LED flicker li cas?

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

Yog tias qhovLED STRIPyog qhov ua rau muaj qhov flicker, koj yuav tsum tau hloov nws rau ib qho tshiab uas ua rau lub zog AC du thiab hloov nws mus rau hauv DC tam sim no ruaj khov tiag tiag, uas tom qab ntawd siv los tsav cov LEDs. Nrhiav "tsis muaj teeb ci ntsa iab"Cov ntawv pov thawj thiab kev ntsuas flicker thaum xaiv ib lub LED strip tshwj xeeb:

Qhov sib txawv ntawm qhov siab tshaj plaws thiab qis tshaj plaws ntawm qhov ci ntsa iab (amplitude) hauv lub voj voog flicker yog qhia ua feem pua ​​​​​​qhab nia hu ua "flicker percent." Feem ntau, lub teeb incandescent flickers ntawm 10% thiab 20%. (vim tias nws cov filament khaws qee qhov kub thaum lub sijhawm "hav" hauv AC teeb liab).

Flicker Index yog ib qho kev ntsuas uas ntsuas qhov ntau thiab ntev npaum li cas lub LED tsim lub teeb ntau dua li niaj zaus thaum lub voj voog flicker. Lub flicker index ntawm lub teeb incandescent yog 0.04.

Tus nqi uas lub voj voog flicker rov ua dua ib ob yog hu ua flicker zaus thiab yog qhia hauv hertz (Hz). Vim yog qhov zaus ntawm lub teeb AC nkag los, feem ntau ntawm cov teeb LED yuav ua haujlwm ntawm 100-120 Hz. Cov flicker thiab flicker index zoo sib xws yuav muaj tsawg dua qhov cuam tshuam rau cov teeb nrog cov zaus siab dua vim lawv lub sijhawm hloov pauv sai dua.

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

Koj yuav tsum tau hloov lub PWM dimmer unit yog tias PWM dimmer lossis maub los tswj yog qhov ua rau muaj qhov flicker. Qhov xov xwm zoo yog tias vim tias cov LED strips lossis lwm yam khoom tsis zoo li yuav yog qhov ua rau muaj qhov flicker, tsuas yog PWM dimmer lossis maub los tswj yuav tsum tau hloov.

Thaum nrhiav kev daws teeb meem PWM uas tsis muaj flicker, xyuas kom tseeb tias muaj qhov ntsuas zaus meej vim tias qhov ntawd yog tib qho PWM flicker metric uas muaj txiaj ntsig (vim tias feem ntau nws yog lub teeb liab uas muaj 100% flicker). Peb xav kom muaj PWM zaus ntawm 25 kHz (25,000 Hz) lossis siab dua rau kev daws teeb meem PWM uas tsis muaj flicker tiag tiag.

Qhov tseeb, cov qauv zoo li IEEE 1789 qhia tau tias PWM lub teeb ci nrog zaus ntawm 3000 Hz yog qhov zaus siab txaus los txo qhov cuam tshuam ntawm kev ntsais muag. Txawm li cas los xij, ib qho txiaj ntsig ntawm kev tsa zaus siab dua 20 kHz yog tias nws tshem tawm qhov muaj peev xwm rau cov khoom siv fais fab los tsim cov suab nrov lossis suab quaj. Qhov laj thawj rau qhov no yog tias qhov zaus hnov ​​​​​​ntau tshaj plaws rau cov neeg feem coob yog 20,000 Hz, yog li los ntawm kev teev qee yam ntawm 25,000 Hz, piv txwv li, koj tuaj yeem zam qhov ua tau ntawm cov suab nrov lossis suab quaj, uas tuaj yeem ua teeb meem yog tias koj rhiab heev lossis yog tias koj daim ntawv thov rhiab heev rau suab.