Kodi choyatsira cha LED chingakonzedwe bwanji?

Popeza tifunika kudziwa kuti ndi mbali ziti za makina owunikira zomwe ziyenera kukonzedwa kapena kusinthidwa, tagogomezera kufunika kozindikira komwe kumachokera kuwala (kodi ndi mphamvu ya AC kapena PWM?).

NgatiMzere wa LEDNgati chifukwa cha kuthwanima kwa magetsi, muyenera kusinthana ndi yatsopano yomwe imapangidwira kuti isinthe mphamvu ya AC kukhala DC current yokhazikika, yomwe imagwiritsidwa ntchito kuyendetsa ma LED.yopanda kung'anima"zitsimikizo ndi miyeso yowala posankha mzere wa LED makamaka:

Kusiyana kofanana pakati pa kuchuluka kwa kuwala kwakukulu ndi kochepa (amplitude) mkati mwa kuzungulira kwa flicker kumafotokozedwa ngati kuchuluka kwa peresenti kotchedwa "flicker percentage." Kawirikawiri, babu la incandescent limawala pakati pa 10% ndi 20%. (chifukwa ulusi wake umasunga kutentha kwake panthawi ya "zigwa" mu chizindikiro cha AC).

Flicker Index ndi muyeso womwe umawerengera kuchuluka ndi nthawi yomwe LED imapanga kuwala kochulukirapo kuposa nthawi zonse panthawi ya flicker cycle. Flicker index ya babu ya incandescent ndi 0.04.

Liwiro limene flicker cycle imadzibwereza yokha pa sekondi imodzi limadziwika kuti flicker frequency ndipo limawonetsedwa mu hertz (Hz). Chifukwa cha kuchuluka kwa chizindikiro cha AC chomwe chikubwera, magetsi ambiri a LED amagwira ntchito pa 100-120 Hz. Magawo ofanana a flicker ndi flicker index sangakhale ndi zotsatira zochepa pa mababu omwe ali ndi ma frequency apamwamba chifukwa cha nthawi zawo zosinthira mwachangu.

Pa 100–120 Hz, mababu ambiri a LED amayaka. IEEE 1789 imalimbikitsa kuyaka kotetezeka kwa 8% ("chiopsezo chochepa") pafupipafupi, ndi 3% kuti athetseretu zotsatira za kuyaka.

Mudzafunikanso kusintha chipangizo choyezera kuwala cha PWM ngati chipangizo choyezera kuwala cha PWM kapena chowongolera kuwala ndicho chimayambitsa kufewetsa kuwala. Nkhani yabwino ndi yakuti popeza mizere ya LED kapena zigawo zina sizingakhale gwero la kufewetsa kuwala, chipangizo choyezera kuwala cha PWM kapena chowongolera chokha ndicho chikufunika kusinthidwa.

Mukafuna yankho la PWM lopanda kung'anima, onetsetsani kuti pali kuchuluka kwa ma frequency chifukwa ndicho chokhacho chothandiza cha PWM flicker metric (chifukwa nthawi zambiri chimakhala chizindikiro chokhala ndi kung'anima kwa 100%). Tikupangira kuti PWM igwiritsidwe ntchito pafupipafupi ya 25 kHz (25,000 Hz) kapena kupitirira apo kuti mupeze yankho la PWM lopanda kung'anima.

Ndipotu, miyezo monga IEEE 1789 imasonyeza kuti magwero a kuwala a PWM okhala ndi ma frequency a 3000 Hz ndi ma frequency okwanira kuchepetsa kwathunthu mphamvu ya kuzima. Komabe, phindu limodzi lokweza ma frequency opitilira 20 kHz ndikuti limachotsa kuthekera kwa zida zamagetsi kupanga mawu omveka bwino kapena odandaula. Chifukwa cha izi ndikuti ma frequency omveka bwino kwa anthu ambiri ndi 20,000 Hz, kotero posankha china chake pa 25,000 Hz, mwachitsanzo, mutha kupewa kuthekera kwa mawu odandaula kapena odandaula, omwe angakhale ovuta ngati muli ozindikira kwambiri kapena ngati pulogalamu yanu ndi yomvera kwambiri mawu.