I-LED flicker ingalungiswa njani?

Ngenxa yokuba kufuneka sazi ukuba zeziphi iindawo zenkqubo yokukhanyisa ekufuneka ziphuculwe okanye zitshintshwe, sigxininise ukubaluleka kokuchonga umthombo we-flicker (ingaba ngamandla e-AC okanye yi-PWM?).

UkubaI-LED SCRIPUkuba yimbangela yokuqhawuka, kuya kufuneka uyitshintshe ngentsha eyenzelwe ukuthambisa amandla e-AC kwaye uyiguqule ibe yi-DC current ezinzileyo ngokwenene, esetyenziselwa ukuqhuba ii-LED. Khangela “akukho kufiphaza"iziqinisekiso kunye nokulinganisa okukhanyayo xa ukhetha umcu we-LED ngokukodwa:

Umahluko olinganayo phakathi kwamanqanaba okukhanya aphezulu kunye namanqanaba amancinci (i-amplitude) ngaphakathi komjikelo we-flicker uchazwa njengepesenti yamanqaku abizwa ngokuba yi-"flicker percent." Ngokwesiqhelo, ibhalbhu ye-incandescent itshaza phakathi kwe-10% kunye ne-20%. (kuba i-filament yayo igcina ubushushu bayo ngexesha "leentlambo" kwisignali ye-AC).

I-Flicker Index yindlela yokulinganisa ubungakanani kunye nobude bexesha i-LED evelisa ukukhanya okungaphezulu kunesiqhelo ngexesha lomjikelo we-flicker. I-flicker index yebhalbhu ye-incandescent yi-0.04.

Isantya apho umjikelo we-flicker uziphindaphinda ngomzuzwana saziwa ngokuba yi-flicker frequency kwaye sibonakaliswa kwi-hertz (Hz). Ngenxa yesantya sesignali ye-AC engenayo, uninzi lwezibane ze-LED ziya kusebenza kwi-100-120 Hz. Amanqanaba afanayo e-flicker kunye ne-flicker index aya kuba nefuthe elincinci kwiibhalbhu ezineefrikhwensi eziphezulu ngenxa yamaxesha azo okutshintsha ngokukhawuleza.

Kwi-100–120 Hz, uninzi lweebhalbhu ze-LED ziyadanyaza. I-IEEE 1789 icebisa ukuba i-8% ekhuselekileyo (“umngcipheko ophantsi”) idanyaze kule frequency, kunye ne-3% ukuphelisa ngokupheleleyo iziphumo ze-danyaza.

Kuya kufuneka uphinde ufake iyunithi ye-PWM dimmer endaweni yayo ukuba i-PWM dimmer okanye i-controller yimbangela ye-flicker. Iindaba ezimnandi zezokuba ekubeni ii-LED strips okanye ezinye izinto zingenakwenzeka ukuba zibe ngumthombo we-flicker, yi-PWM dimmer okanye i-controller kuphela ekuya kufuneka itshintshwe.

Xa ufuna isisombululo se-PWM esingena-flicker, qiniseka ukuba kukho umlinganiselo ocacileyo we-frequency kuba yiyo yodwa i-PWM flicker metric eluncedo (kuba ihlala iyisignali ene-100% flicker). Sicebisa i-PWM frequency ye-25 kHz (25,000 Hz) nangaphezulu kwisisombululo se-PWM esingena-flicker ngokwenene.

Enyanisweni, imigangatho efana ne-IEEE 1789 ibonisa ukuba imithombo yokukhanya ye-PWM ene-frequency ye-3000 Hz inamandla aneleyo okunciphisa ngokupheleleyo impembelelo yokufiphaza. Nangona kunjalo, enye inzuzo yokuphakamisa i-frequency ngaphezu kwe-20 kHz kukuba isusa amandla ezixhobo zombane okuvelisa izandi ezivakalayo okanye ezikhalayo. Isizathu soku kukuba i-frequency ephezulu evakalayo kubantu abaninzi yi-20,000 Hz, ngoko ke ngokuchaza into kwi-25,000 Hz, umzekelo, ungaphepha amathuba e-buzzing okanye izandi ezikhalayo ezicaphukisayo, ezinokuba yingxaki ukuba ungumntu ovakalelwa kakhulu okanye ukuba usetyenziso lwakho luvakalelwa kakhulu yizandi.