Sidee loo hagaajin karaa flickerka LED?

Sababtoo ah waxaan u baahanahay inaan ogaano qaybaha nidaamka iftiinka u baahan in la hagaajiyo ama la beddelo, waxaan xoogga saarnay sida ay muhiimka u tahay in la aqoonsado isha flickerka (ma awooda AC ama PWM?).

Haddii aySTRIP LEDwaa sababta flicker-ka, waxaad u baahan doontaa inaad ku beddesho mid cusub oo loo sameeyay si loo khafiifiyo awoodda AC oo loogu beddelo hadda xasilloon oo DC ah, ka dibna loo isticmaalo in lagu wado LED-yada. Raadi"flicker free"shahaadada iyo cabbiraadaha flicker marka aad dooranayso xariijinta LED gaar ahaan:

Farqiga saamiga ee u dhexeeya heerarka dhalaalka ugu sarreeya iyo kan ugu yar (weynaanta) gudaha wareegga flicker-ka waxaa lagu muujiyey sida boqolkiiba dhibcaha loo yaqaan "boqolkiiba flicker." Caadi ahaan, nalka iftiinka wuxuu u dhexeeyaa 10% iyo 20%. (maxaa yeelay xayndaabkeedu waxa uu xajiyaa qaar ka mid ah kulaylkiisa inta lagu jiro "dooxyada" calaamada AC).

Tusmada Flicker waa mitir cabbiraysa cadadka iyo muddada wakhtiga ay LED-ku dhalinayaan iftiin ka badan inta caadiga ah inta lagu jiro wareegga flickerka. Tusmada flicker ee nalka shidan waa 0.04.

Heerka uu wareegtada flicker-ku ku soo noqnoqdo ilbiriqsikiiba waxa loo yaqaan inta jeer ee flicker waxaana lagu muujiyaa hertz (Hz). Sababtoo ah inta jeer ee calaamada AC ee soo socota, inta badan nalalka LED waxay ku shaqeyn doonaan 100-120 Hz. Heerarka fiiq-fiiqa ee la midka ah ayaa saameyn yar ku yeelan doona nalalka leh wareegyo sare sababtoo ah waqtiyada beddelka degdegga ah.

Marka la joogo 100-120 Hz, inta badan nalalka LED-ku way liibaanaan. IEEE 1789 waxay ku talinaysaa 8% badbaado leh ("khatar yar") inta jeer een, iyo 3% in gebi ahaanba la tirtiro saamaynta flicker-ka.

Waxaad sidoo kale u baahan doontaa inaad bedesho unugga dimmer-ka PWM haddii PWM dimmer ama koontarooluhu ay tahay sababta flickerka. Akhbaarta wanaagsan ayaa ah in maadaama xariijinta LED-yada ama qaybaha kale aysan u badneyn inay noqdaan isha flicker-ka, kaliya PWM dimmer ama koontaroolaha ayaa u baahan doona in la beddelo.

Markaad raadinayso xal PWM bilaash ah, iska hubi inuu jiro qiimaynta soo noqnoqoshada cad sababtoo ah taasi waa mitirka flickerka kaliya ee PWM (maxaa yeelay had iyo jeer waa calaamad leh 100% flicker). Waxaan u soo jeedineynaa inta jeer ee PWM ee 25 kHz (25,000 Hz) ama ka sareeya xalka PWM oo runtii ah mid aan liidata lahayn.

Dhab ahaantii, heerarka sida IEEE 1789 waxay muujinayaan in ilaha iftiinka PWM ee leh soo noqnoqoshada 3000 Hz ay ​​yihiin soo noqnoqosho aad u sarreeya oo si buuxda u yareeya saameynta flickerka. Si kastaba ha ahaatee, hal faa'iido oo kor loogu qaadayo soo noqnoqoshada ka sarreeya 20 kHz ayaa ah inay meesha ka saarto suurtagalnimada aaladaha korantada si ay u abuuraan dhawaaqyo qaylo ama qaylo la dareemi karo. Sababta tani waa in inta jeer ee ugu badan ee la maqli karo ee dadka badankiisu waa 20,000 Hz, markaa adigoo wax ku qeexaya 25,000 Hz, tusaale ahaan, waxaad ka fogaan kartaa suurtogalnimada dhawaaqa buuqa ama qaylada, taas oo noqon karta dhibaato haddii aad si gaar ah u dareensan tahay ama haddii codsigaagu yahay mid xasaasi ah.