Yadda za a gyara walƙiyar LED?

Domin muna buƙatar sanin waɗanne sassa na tsarin hasken da ya kamata a inganta ko a maye gurbinsu, mun jaddada muhimmancin gano tushen walƙiyar (shin wutar AC ce ko PWM?).

IdanLED STRIshine sanadin walƙiyar, za ku buƙaci ku maye gurbinsa da sabon wanda aka ƙera don sassauta wutar AC kuma ya canza shi zuwa wutar DC mai ƙarfi, wanda daga nan ake amfani da shi don tuƙa LEDs. Nemi "babu walƙiya"takaddun shaida da ma'aunin walƙiya lokacin zabar tsiri na LED musamman:

Bambancin da ke tsakanin matsakaicin da mafi ƙarancin matakan haske (girman girma) a cikin zagayowar walƙiya ana bayyana shi a matsayin maki na kashi da ake kira "kashi mai walƙiya." Yawanci, kwan fitila mai walƙiya yana walƙiya tsakanin 10% da 20% (saboda filament ɗinsa yana riƙe da ɗan zafinsa a lokacin "kwari" a cikin siginar AC).

Fihirisar Flicker ma'auni ne da ke auna adadin da tsawon lokacin da LED ke samar da haske fiye da yadda aka saba a lokacin zagayowar walƙiya. Fihirisar walƙiyar kwan fitila mai haske shine 0.04.

Ana kiran saurin da zagayowar walƙiya ke maimaita kanta a kowace daƙiƙa da mitar walƙiya kuma ana bayyana ta a cikin hertz (Hz). Saboda mitar siginar AC mai shigowa, yawancin fitilun LED za su yi aiki a 100-120 Hz. Irin waɗannan matakan walƙiya da firikwensin walƙiya ba za su yi tasiri sosai ga kwararan fitila masu mitoci masu girma ba saboda saurin lokacin sauyawarsu.

A 100–120 Hz, yawancin kwararan fitilar LED suna walƙiya. IEEE 1789 ya ba da shawarar walƙiya mai aminci 8% ("ƙananan haɗari") a wannan mita, da kuma 3% don kawar da tasirin walƙiya gaba ɗaya.

Haka kuma za ku buƙaci maye gurbin na'urar PWM dimmer idan PWM dimmer ko mai sarrafawa shine dalilin flicker. Labari mai daɗi shine tunda tsiri na LED ko wasu sassa ba su da tabbas su ne tushen flicker, PWM dimmer ko mai sarrafawa ne kawai za a buƙaci a maye gurbinsu.

Lokacin neman mafita ta PWM mara walƙiya, tabbatar da cewa akwai ƙimar mita a bayyane domin wannan ita ce kawai ma'aunin walƙiya ta PWM mai amfani (domin yawanci koyaushe sigina ce mai walƙiya 100%). Muna ba da shawarar mitar PWM ta 25 kHz (25,000 Hz) ko sama da haka don mafita ta PWM wacce ba ta walƙiya a zahiri.

A zahiri, ƙa'idodi kamar IEEE 1789 sun nuna cewa tushen hasken PWM mai mita 3000 Hz suna da isasshen mita don rage tasirin walƙiya gaba ɗaya. Duk da haka, fa'idar ɗaga mita sama da 20 kHz ita ce yana kawar da yuwuwar na'urorin samar da wutar lantarki don ƙirƙirar sautunan ƙara ko kuka masu kyau. Dalilin haka shine matsakaicin mitar da ake iya ji ga yawancin mutane shine 20,000 Hz, don haka ta hanyar ƙayyade wani abu a 25,000 Hz, misali, zaku iya guje wa yiwuwar ƙara ko kuka mai ban haushi, wanda zai iya zama matsala idan kuna da matukar damuwa ko kuma idan aikace-aikacenku yana da matukar saurin sauti.