Ta yaya za a iya gyara flicker LED?

Saboda muna buƙatar sanin waɗanne sassa na tsarin hasken da ake buƙatar ingantawa ko maye gurbinsu, mun jaddada mahimmancin yadda yake da mahimmanci don gano tushen flicker (shin AC ne ko PWM?).

Idan daLED STRIPshine dalilin flicker, za ku buƙaci musanya shi zuwa wani sabon wanda aka yi don daidaita wutar AC kuma a canza shi zuwa wani tsayayyen DC na gaske, wanda ake amfani dashi don fitar da LEDs. Nemo"flicker kyautaTakaddun shaida da ma'aunin flicker lokacin zabar tsiri na LED musamman:

Bambancin madaidaicin tsakanin matsakaici da mafi ƙarancin matakan haske (amplitude) a cikin zagayowar flicker ana bayyana shi azaman ƙimar kashi da ake kira “kashi flicker.” Yawanci, kwan fitila mai walƙiya yana flickers tsakanin 10% zuwa 20%. (saboda filament ɗin sa yana riƙe da ɗan zafi yayin "kwaruruka" a cikin siginar AC).

Fihirisar Flicker ma'auni ne wanda ke ƙididdige adadin da tsawon lokacin da LED ke samar da haske fiye da yadda aka saba yayin zagayowar flicker. Fihirisar flicker na kwan fitila mai incandescent shine 0.04.

Adadin da sake zagayowar flicker ke maimaita kansa a cikin daƙiƙa ɗaya ana saninsa da mitar flicker kuma ana bayyana shi a cikin hertz (Hz). Saboda yawan siginar AC mai shigowa, yawancin fitilun LED za su yi aiki a 100-120 Hz. Makamantan flicker da matakan fihirisa flicker ba zai yi tasiri a kan kwararan fitila masu tsayin mitoci ba saboda saurin canjin lokutan su.

A 100-120 Hz, mafi yawan LED kwararan fitila flicker. IEEE 1789 yana ba da shawarar 8% aminci ("ƙananan haɗari") flicker a wannan mitar, kuma 3% don kawar da tasirin flicker gaba ɗaya.

Hakanan kuna buƙatar maye gurbin sashin dimmer na PWM idan dimmer PWM ko mai sarrafawa shine sanadin flicker. Labari mai dadi shine tun da tube LED ko wasu abubuwan da ba za su iya zama tushen flicker ba, kawai PWM dimmer ko mai sarrafawa zai buƙaci maye gurbinsa.

Lokacin neman mafita na PWM mara flicker, tabbatar da cewa akwai takamaiman ƙimar mitar saboda wannan shine kawai ma'aunin flicker PWM mai amfani (saboda yawanci koyaushe sigina ne tare da 100% flicker). Muna ba da shawarar mitar PWM na 25 kHz (25,000 Hz) ko mafi girma don maganin PWM wanda ba shi da flicker da gaske.

A zahiri, ma'auni kamar IEEE 1789 sun nuna cewa tushen hasken PWM tare da mitar 3000 Hz suna da isasshen mitar don rage tasirin flicker. Koyaya, fa'ida ɗaya na haɓaka mitar sama da 20 kHz shine yana kawar da yuwuwar na'urorin samar da wutar lantarki don ƙirƙirar sautin ƙararrawa ko hayaniya. Dalilin haka shi ne mafi yawan mitar sauti ga mafi yawan mutane shine 20,000 Hz, don haka ta hanyar ƙayyade wani abu a 25,000 Hz, alal misali, za ku iya guje wa yuwuwar sauti mai ban haushi ko hayaniya, wanda zai iya zama matsala idan kuna da hankali ko musamman. idan aikace-aikacen ku yana da sauti sosai.