Li cas los xaiv tsav LED/Hmong IC?

LED tau tsim los pab nws cov unshakable txoj hauj lwm nyob hauv lub backlighting ntawm cov portable. Nyob ntawm backlighting rau cov coob tsuas LCD vaj huam sib luag, txawm tias nws tau pib cam cov mainstream CCFL. Teeb pom kev zoo, LED yog nrov tshwj xeeb tshaj yog cov lag luam vim nws highlighted nta zog-efficiency, tej friendliness, lub neej ntev, thiab tsis tshua muaj txij nkawm. Cov neeg tsav tsheb Circuit Court yog ib tug tseem ceeb heev thiab ib feem ntawm cov LED. Hais tias thaum teeb pom kev zoo, backlighting los yog cov zaub vaj huam sib luag, tus xaiv txoj kev architecture ntawm cov neeg tsav tsheb Circuit Court yuav tsum sib haum rau tej kev siv.

Tus LED teeb pom kev zoo mechanism mus raws li nram no: thaum lub pem voltage yog thov rau hnub, cov haiv neeg tsawg daim nyias ev thiab feem ntau cab kuj nyob hauv lub semiconductor recombine tso tsuaj zog, muab so photons. Lub zog loj rau hauv Circuit Court LED tsav yog hloov tus AC voltage rau hauv lub qhov fais fab mov thiab phim lub voltage thiab tam sim no raws li cov cai ntawm cov LED. Apart from xav tau kev nyab xeeb, Circuit Court LED tsav tsheb yuav tsum kuj yog ob tug lwm yooj yim nta:
Ua ntej tshaj, ib qho chaw tam sim no yuav tsum tau ceev cia kom ntev li ntev raws li tau, yog li no cov zis tam sim no variation tau raug tswj tseg ntawm cov kab kev los ntawm ±10% tshwj xeeb tshaj yog thaum lub hwj huam mov hloov mus dhau ntau yam % ±15. Ntawm no yog vim li cas muaj ib qhov kev tsav tsheb thaum siv LED qhov saib, lwm teeb pab kiag li lawm los backlighting:
1. kom tiv thaiv tau tus tsav tam sim no los ntawm cov tshaj ntawm tus nqi siab tshaj plaws thiab ntxiv rau txoj kev cia siab rau.
2. yuav raws li qhov yuav tsum tau leej twg brilliance thiab kom cov xim thiab brilliance homogeneity ntawm txhua LED.
Ntxiv mus, tus neeg tsav tsheb Circuit Court cia txhob muab pov tsis tshua muaj zog noj kom tus LED qhov system efficiency yuav nyob rau ib theem siab.
PWM (mem tes dav yog hloov) yog ib tug mob sib kho tshuab, uas siv cov pulses lus hloov rau hauv thiab tawm tsav LED txij ua ke mus ua ke. Lawv tsuas muab dav thiab vos cov pulses lus no thiaj li yooj yim kev pauv qhov tso zis rau kho LED brilliance. Qhov kom zoo dua yog tias lub tshuab yuav muaj qhia zoo dawb kaj siab efficiency los ntawm daim ntawv uas yooj yim. Tiam sis yog ib tug neeg tuag taus disadvantage: nws raug tau EMI (electromagnetic cuam) no, tej zaum tseem ua audible nrov.
Voltage boost yog hauj lwm tseem ceeb LED tus tsav tsheb Circuit Court xwb, muab faib ua ob yam topological hom, namely, voltage boost ntawm cov inductor thiab xwb ib lub menyuam pob. Raws li cov LED tamsis no-uas tau tsav, thiab cov inductor ntau npaum thaum lub caij ntawm tam sim no, ces lub zog loj tshaj ntawm voltage boost ntawm inductor lus dag hauv lub siab efficiency, uas tau txog 90% yog kom tsim. Tsis tas li ntawd, nws tsis muaj zog yuav ua npaum li cas zoo kawg li, i.e., EMI muaj zog, uas imposes npaws yuav tsum nyob rau ntawm telecommunication cov khoom xws li tes txawb lub. Muaj lub zog los ntawm lub twj tso kua xwb, mobiles feem coob tsis boost voltage ntawm cov inductor. Tau kawg, lub efficiency ntawm voltage boost ntawm lub twj tso kua mis xwb yog dua lwm txoj kev uas.
Tsis muaj teeb meem teeb los backlighting daim ntaub ntawv, cov khoom designer muaj fim cov teeb meem ntawm raising efficiency hloov ntaub ntawv tsav tsheb lawm. Kom hloov mus rau lwm lub efficiency tsis tsuas lig rau portable khoom mus cuag lub sij hawm standby tab sis tseem yog ib qho tseem ceeb txhais tau tias yuav kom daws tau qhov teeb meem LED thermal dissipation. Nyob rau hauv lub teeb pom kev zoo, kev siv ntawm cov hwjchim loj LED kuj underlines qhov teeb meem ntawm kev mus pab tau txoj cov hloov efficiency.
LED xav tam sim no thiab voltage stabilizing Cheebtsam ntawm chaw ua hauj lwm, uas yuav tsum tau featured siab faib voltage thiab tsis tshua muaj zog noj, txwv tsis pub, lub LED heev npaum yuav txo lub zog tag nrho efficiency vim tsis muaj siab ua hauj lwm noj, contradicting tus cai hais txog efficiency txuag zog thiab siab. Vim li no, lub ntsiab tam sim no txawj zoo Circuit Court yuav tsum siv npaum ib circuits ib yam li cov capacitance, inductor lossis switching Circuit Court nrog mov hwj huam ua tau kom cov ntshav efficiency ntawm LED lawv siv cov resistor los yog cov series voltage stabilizing Circuit Court. Tus series zog qhov zis Circuit Court yuav khaws cov LED lub teeb cov zis qhov ntau ntawm cov hwjchim mov, tiam sis tej/Hmong IC circuits yuav plam tej efficiency. Mus tu lub switching Circuit Court nrog mov hwjchim yeej yuav lav tsis tau tso zis ntau zog qhov uas hloov siab efficiency hauv sis voltage variation ntawm cov hwjchim mov.
Thaum nimno, LED nrog nws cov miv nyuas siv zug luminous far from hloov lub teeb txawb peb qhab fluorescent no, tsis tau txog LED teeb tau nraaj ua hauj lwm hauv kev ruaj ntseg uas xyuas kom tsis muaj voltage (SELV), tamsim, underwater teeb da dej los yog pas paddling, nws tsuas roj. Besides, LED lawm nws zoo nyob rau hauv tib neeg siv ntawm ntsuab lub zog zoo li lub hnub ci zog, cua zog, los yog thaum muaj xwm ceev teeb. Yog raug rau sib kho kom haum, LED tsis tau xwb twb paub lawm xoom mus kho ib puas feem pua, tab sis kuj muaj siab cov miv nyuas siv zug thaum kho cov txheej txheem tsis tau ua phem rau cov xauv, uas yog ib cov neeg ua hauj lwm rau pa paug teeb tus kheej.


 

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