Anzanu ena amafunsa zifukwa zodziwika bwino komanso njira zochizira magetsi a LED omwe amawala, ndipo ena amafuna kufunsa chifukwa chake magetsi a LED sawala. Kodi chikuchitika ndi chiyani? Ndipotu, pali zinthu zitatu zomwe zimalephera komanso njira zothetsera magetsi a LED.
Kulephera kofala kwa magetsi a LED ndi mayankho ake ndi zinthu zitatu:
Vuto lofala kwambiri ndi kulephera kwa chokonza. Pitani ku light City mukagule chimodzi ndikuchisintha. Led yonse siwonongeka kawirikawiri.
Zifukwa ziwiri: Kuwala kwa chizindikiro cha LED:
1. Mikanda ya nyali ndi mphamvu ya LED drive sizikugwirizana, mikanda ya nyali ya 1W yachibadwa imakhala ndi mphamvu yamagetsi ya :280-300 ma ndi :3.0-3.4V, ngati chipu cha nyali chilibe mphamvu yokwanira, imayambitsa vuto la kuwala, ngati mphamvu yamagetsi ndi yayikulu kwambiri, mikanda ya nyali singathe kupirira switch. Pazochitika zazikulu, mawaya agolide kapena amkuwa omwe ali mkati mwa mikanda amatha kuyaka, zomwe zimapangitsa kuti mikandayo isagwire ntchito.
2. Mphamvu yamagetsi ya drive ikhoza kuwonongeka, bola mutaisintha ndi mphamvu ina yabwino ya drive, sidzathima.
3. Ngati dalaivala ali ndi ntchito yoteteza kutentha kwambiri, mphamvu ya nyali ya LED yotulutsa kutentha siingakwaniritse zofunikira, ndipo chitetezo cha kutentha kwambiri cha dalaivala chidzathima ikayamba kugwira ntchito. Mwachitsanzo, nyumba ya nyali yowonetsera ya 20 w yomwe imagwiritsidwa ntchito kupangira nyali za 30W siigwira ntchito bwino pakuziziritsa.
4. Ngati nyali zakunja zili ndi zochitika za stroboscopic, zikutanthauza kuti nyalizo zadzaza ndi madzi. Chifukwa chake, ngati zithina, sizimawala. Beacon ndi dalaivala zasweka. Ngati dalaivala wachita bwino poteteza madzi, mkanda wa nyali wasweka ndipo gwero la nyali likhoza kusinthidwa.
Zitatu. Njira yogwiritsira ntchito kuwala kwa chizindikiro cha LED:
1. Mu ntchito zowunikira za LED zopanda mphamvu zambiri, mphamvu yodziwika bwino ndi topology yodzipatula ya flyback. Green Dot, dalaivala wa LED wopanda mphamvu wa 8W, imakwaniritsa miyezo ya magetsi ya energy Star solid-state. Pakapangidwe kake, chifukwa kusintha kwa mphamvu ya sinusoidal square wave ya flyback regulator sikumapereka mphamvu yokhazikika pa bias yoyamba, dera lodziyendetsa lokha limatha kuyatsa ndikuyambitsa kuwala. Kuti mupewe vutoli, ndikofunikira kupanga kutulutsa koyambirira kwa off-set mu theka lililonse la kuzungulira. Chifukwa chake, ndikofunikira kusankha bwino mphamvu ndi kukana kwa nyali za chizindikiro cha LED zomwe zimapanga dera.
2. Kawirikawiri diso la munthu limatha kuona kuwala kowala pa 70 Hz, koma pamwamba pa apo silingathe. Chifukwa chake, mu ntchito zowunikira za LED, ngati chizindikiro cha pulse chili ndi gawo lotsika la frequency ndi 70 Hz, diso la munthu lidzamva kuwala kowala. Zachidziwikire, pali zinthu zambiri zomwe zingayambitse kuwala kwa LED mu pulogalamu inayake.
3. Zosefera za Emi zimafunika ngakhale mu mapulogalamu a LED drive omwe amapereka mphamvu yabwino yokonza zinthu komanso kuthandizira kufooka kwa ma switch a SCR okhala ndi ma terminal awiri. Mphamvu yocheperako yomwe imayambitsidwa ndi sitepe ya switch ya SCR yokhala ndi ma terminal awiri imasangalatsa mphamvu yachilengedwe ya ma inductors ndi ma capacitor mu emi filter.
Ngati khalidwe la resonance limapangitsa kuti mphamvu yolowera ikhale yotsika kuposa mphamvu yogwira ya chinthu chosinthira cha SCR chokhala ndi ma terminal awiri, chinthu chosinthira cha SCR chokhala ndi ma terminal awiri chidzazimitsidwa. Pambuyo pochedwa pang'ono, chinthu chosinthira cha SCR chokhala ndi ma terminal awiri nthawi zambiri chimayatsidwanso kuti chisangalatse resonance yomweyo. Zochitika izi zitha kubwerezedwa kangapo mkati mwa theka la kuzungulira kwa INPUT power waveform ya LED semaphore, zomwe zimapangitsa kuti LED iwonekere.
Nthawi yotumizira: Mar-11-2022
