I-LED flicker ingalungiswa kanjani?

Ngenxa yokuthi sidinga ukwazi ukuthi yiziphi izingxenye zesistimu yokukhanyisa ezidinga ukuthuthukiswa noma ukushintshwa, sigcizelele ukuthi kubaluleke kangakanani ukuthola umthombo wokufiphaza (ingabe amandla e-AC noma i-PWM?).

UmaI-LED SLARTUma imbangela yokukhanya, kuzodingeka uyishintshe ngentsha eyenzelwe ukushelela amandla e-AC bese uyiguqula ibe ugesi we-DC ozinzile ngempela, ozobe ususetshenziselwa ukushayela ama-LED.akukho ukufiphaza"izitifiketi kanye nokulinganisa okukhanyayo lapho ukhetha umucu we-LED ikakhulukazi:

Umehluko olinganayo phakathi kwamazinga okukhanya aphezulu naphansi (amplitude) ngaphakathi komjikelezo we-flicker uvezwa njengesilinganiso samaphesenti esibizwa ngokuthi “iphesenti le-flicker.” Ngokuvamile, isibani se-incandescent sikhanya phakathi kuka-10% no-20%. (ngoba i-filament yayo igcina ukushisa kwayo ngesikhathi “sezigodini” kusignali ye-AC).

I-Flicker Index iyisilinganiso esilinganisa inani kanye nobude besikhathi i-LED ekhiqiza ngaso ukukhanya okwengeziwe kunokuvamile ngesikhathi somjikelezo wokufiphaza. Inkomba yokufiphaza yebhalbhu ye-incandescent ingu-0.04.

Izinga lapho umjikelezo we-flicker uziphinda khona ngomzuzwana laziwa ngokuthi imvamisa ye-flicker futhi livezwa nge-hertz (Hz). Ngenxa yemvamisa yesignali ye-AC engenayo, iningi lezibani ze-LED lizosebenza ku-100-120 Hz. Amazinga afanayo e-flicker kanye ne-flicker index azoba nomthelela omncane kuma-bulb anemvamisa ephezulu ngenxa yezikhathi zawo zokushintsha ezisheshayo.

Ku-100–120 Hz, iningi lama-LED liyakhanya. I-IEEE 1789 itusa ukukhanya okuphephile okungu-8% (“ingozi ephansi”) kulesi silinganiso, kanye no-3% ukuqeda ngokuphelele imiphumela yokukhanya.

Kuzodingeka futhi ushintshe iyunithi ye-PWM dimmer uma i-PWM dimmer noma isilawuli kuyimbangela ye-flicker. Izindaba ezinhle ukuthi njengoba imichilo ye-LED noma ezinye izingxenye kungenzeka ukuthi aziyona umthombo we-flicker, i-PWM dimmer noma isilawuli kuphela esizodinga ukushintshwa.

Uma ufuna isisombululo se-PWM esingena-flicker, qiniseka ukuthi kunesilinganiso semvamisa esicacile ngoba yiso kuphela i-metric ye-PWM flicker ewusizo (ngoba ngokuvamile ihlala iyisignali ene-100% flicker). Siphakamisa imvamisa ye-PWM engu-25 kHz (25,000 Hz) noma ngaphezulu kwesisombululo se-PWM esingena-flicker ngempela.

Eqinisweni, amazinga afana ne-IEEE 1789 abonisa ukuthi imithombo yokukhanya ye-PWM enemvamisa engu-3000 Hz iyimvamisa ephezulu ngokwanele yokunciphisa ngokuphelele imiphumela yokufiphaza. Kodwa-ke, inzuzo eyodwa yokuphakamisa imvamisa ngaphezu kuka-20 kHz ukuthi iqeda amandla amadivayisi okunikeza amandla okudala imisindo ezwakalayo yokubhuza noma yokububula. Isizathu salokhu ukuthi imvamisa ephezulu ezwakalayo kubantu abaningi ingu-20,000 Hz, ngakho-ke ngokucacisa okuthile ku-25,000 Hz, isibonelo, ungagwema amathuba emisindo ecasulayo yokubhuza noma yokububula, okungaba yinkinga uma uzwela kakhulu noma uma uhlelo lwakho lokusebenza luzwela kakhulu umsindo.