Meanwell Dalaivala: Kupanga Kwamphamvu Kwanthawi Zonse kwa Woyendetsa LED
Posachedwapa, imodzi mwamitu yotchuka kwambiri pamakampani opanga magetsi a LED ndi kuyendetsa magetsi kwa LED nthawi zonse. Chifukwa chiyani ma LED amayenera kuyendetsedwa ndi magetsi nthawi zonse? Chifukwa chiyani sangayendetsedwe ndi mphamvu zokhazikika? Tisanakambirane nkhaniyi, choyamba tiyenera kumvetsetsa chifukwa chake LED iyenera kuyendetsedwa ndi nthawi zonse. Monga momwe chithunzi cha graph LED curve, mphamvu yakutsogolo ya LED ikusintha ndi 2.5%, magetsi apano kudzera pa LED asintha pafupifupi 16%, ndipo magetsi akutsogolo a LED amakhudzidwa mosavuta ndi kutentha. Kusiyana kwa kutentha pakati pa kutentha kwakukulu ndi kutsika kungayambitsenso magetsi. Kusiyana kwamagetsi kumapitilira 20%. Kuphatikiza apo, kuwala kwa LED kumayenderana ndi kutsogolo kwa LED. Kusiyana kwakukulu komweku kumabweretsa kusintha kowala kwambiri, chifukwa chake nyali ya LED iyenera kuyendetsedwa ndi nthawi zonse. Komabe, kodi kuyendetsa magetsi kosalekeza kungagwiritsidwe ntchito pa LED? Choyamba, nkhani yoti mphamvu yokhazikika ndi yofanana ndi kuwala kosalekeza ikukambidwa. Kuchokera pamalingaliro akungokambirana za kapangidwe ka dalaivala wamagetsi nthawi zonse, kusintha kwa LED ndi kutentha kopindika kumawoneka kotheka. Chifukwa chiyani wopanga dalaivala wa LED sapanga mwachindunji dalaivala wamagetsi osasintha? Pali zifukwa zambiri. Sizovuta kupanga chigawo chamagetsi chokhazikika. Ndizosavuta kugwiritsa ntchito MCU (Micro Controller Unit) kuti muzindikire mphamvu yamagetsi ndi yapano, kuwongolera nthawi yaudindo ya PWM (Pulse Width Modulation) kudzera pakuwerengera pulogalamu, ndikuwongolera mphamvu yotulutsa pamagetsi okhazikika amtundu wa buluu. . Nthawi zonse mphamvu linanena bungwe chingapezeke, koma njirayi kumawonjezera ndalama zambiri, ndipo pamene yochepa dera kuwonongeka kumachitika, nthawi zonse mphamvu LED dalaivala adzawonjezera panopa chifukwa kudziwika voteji m'munsi, zomwe zingayambitse vuto lalikulu. Kuphatikiza apo, mawonekedwe a kutentha kwa LED ndi kutentha kokwanira koyipa. Kutentha kukakhala kopitilira muyeso, timayembekeza kuchepetsa kutulutsa komweku kuti tisunge magwiridwe antchito a moyo wautali wa LED. Komabe, njira yamagetsi yosalekeza ndi yosagwirizana ndi kulingalira uku. Pogwiritsa ntchito kutentha kwakukulu kwa LED, kutulutsa kwamakono kwa dalaivala wa LED kumawonjezeka chifukwa cha kuzindikira kwa magetsi otsika. Poganizira zonse zomwe tafotokozazi, ndiye njira yabwino kwambiri yoperekera makasitomala "quasi-constant power" woyendetsa wa LED wokhala ndi ma voliyumu osiyanasiyana / zotulutsa pano.
Dalaivala wamagetsi wanthawi zonse wa LED wolembedwa ndi zinthu zina za Meanwell amagwiritsa ntchito mtundu uwu wa kukhathamiritsa kwamphamvu kwamtunduwu makamaka. Cholinga chake ndikupereka makasitomala osiyanasiyana ma voliyumu/panopa linanena bungwe quasi-nthawi zonse mphamvu LED dalaivala. Sizingangoganizira zofuna za ogwiritsa ntchito ndikupewa kuwonjezeka kwa mtengo komwe kumachitika chifukwa cha mapangidwe apamwamba kapena zovuta zomwe zimayambitsidwa ndi mawonekedwe a LED, komanso zimayambitsa kulephera kwa nyali ndikupereka nthawi zonse. Mapangidwe osiyanasiyana amagetsi amatha kunenedwa kuti ndi njira yabwino kwambiri yothetsera magetsi a LED pamsika pano.