Kodi chowunikira cha LED chingakonzedwe bwanji?

Chifukwa tikuyenera kudziwa kuti ndi mbali ziti za magetsi omwe akuyenera kukonzedwa kapena kusinthidwa, tidatsindika momwe kulili kofunikira kuti tidziwe komwe kumachokera (kodi ndi mphamvu ya AC kapena PWM?).

Ngati ndiLED STRIPndiye chifukwa chakuthwanima, muyenera kusinthana ndi chatsopano chomwe chimapangidwa kuti chizitha kutulutsa mphamvu ya AC ndikuchisintha kukhala chokhazikika cha DC chapano, chomwe chimagwiritsidwa ntchito kuyendetsa ma LED. Yang'anani "zopanda pake” certification ndi miyeso yoyipitsitsa posankha makamaka chingwe cha LED:

Kusiyana kofananira pakati pa milingo yowala kwambiri ndi yocheperako (matamplitude) mkati mwa kuzungulira kwa flicker kumawonetsedwa ngati maperesenti otchedwa "flicker percent." Nthawi zambiri, mababu a incandescent amayaka pakati pa 10% ndi 20%. (chifukwa filament yake imasunga kutentha kwake panthawi ya "zigwa" mu chizindikiro cha AC).

Flicker Index ndi metric yomwe imawerengera kuchuluka ndi nthawi ya nthawi yomwe LED imatulutsa kuwala kochulukirapo kuposa nthawi zonse pakazungulira. Mlozera wonyezimira wa babu wa incandescent ndi 0.04.

Mulingo womwe kuzungulira kwa flicker kumabwerezedwa pa sekondi imodzi kumadziwika kuti flicker frequency ndipo amawonetsedwa mu hertz (Hz). Chifukwa cha kuchuluka kwa chizindikiro cha AC chomwe chikubwera, nyali zambiri za LED zizigwira ntchito pa 100-120 Hz. Milingo yofananira ya flicker ndi flicker index ingakhale ndi chiwopsezo chochepa pa mababu okhala ndi ma frequency apamwamba chifukwa amasinthasintha mwachangu.

Pa 100-120 Hz, mababu ambiri a LED akuthwanima. IEEE 1789 imalimbikitsa 8% yotetezeka ("chiwopsezo chochepa") pafupipafupi, ndi 3% kuti ithetseretu zotsatira za flicker.

Mudzafunikanso kusintha PWM dimmer unit ngati PWM dimmer kapena controller ndizomwe zimayambitsa. Nkhani yabwino ndiyakuti popeza mizere ya LED kapena zida zina sizingakhale gwero la chowotcha, chowongolera cha PWM chokha kapena chowongolera ndichofunika kusinthidwa.

Mukamayang'ana yankho la PWM lopanda flicker, onetsetsani kuti pali ma frequency omveka bwino chifukwa ndiye njira yokhayo yothandiza ya PWM (chifukwa nthawi zambiri imakhala chizindikiro chokhala ndi 100% flicker). Timapereka mafupipafupi a PWM a 25 kHz (25,000 Hz) kapena apamwamba pa yankho la PWM lomwe limakhala lopanda kuthwanima.

M'malo mwake, miyezo ngati IEEE 1789 ikuwonetsa kuti magwero a kuwala a PWM okhala ndi ma frequency a 3000 Hz ndi ma frequency okwera mokwanira kuti achepetse zovuta za kuthwanima. Komabe, phindu limodzi lokweza ma frequency pamwamba pa 20 kHz ndikuti limachotsa kuthekera kwa zida zamagetsi kuti zipangitse phokoso lodziwika bwino kapena kulira. Chifukwa chake ndikuti ma frequency omveka kwambiri kwa anthu ambiri ndi 20,000 Hz, kotero pofotokoza china chake pa 25,000 Hz, mwachitsanzo, mutha kupewa kumveka kokwiyitsa kapena kumveka kolira, komwe kumatha kukhala kovuta ngati muli omvera kwambiri kapena ngati pulogalamu yanu ndi yovuta kwambiri.