LED Circuit Configuration

Forward Voltage

Thaum tam sim no ntws los ntawm LED nyob rau hauv cov kev taw qhia zoo, qhov voltage generated ntawm lub anode thiab cathode yog hu ua rau pem hauv ntej voltage (VF). Qhov ntsuas hluav taws xob yog volts (V).
Nyob rau hauv cov ntaub ntawv piv txwv li, tus yam ntxwv graph ntawm pem hauv ntej voltage generated raws li nram no ndlwg yog muab (Forward Current IF vs Forward Voltage VF).
Cov yam ntxwv no yog qhov tseem ceeb tshaj plaws thaum xav txog qhov tseeb LED teeb pom kev zoo.

IF-VF cov yam ntxwv yuav txawv nyob ntawm seb cov khoom siv LED, qhov loj me, thiab txawm tias cov xim emitting. Nws kuj yuav txawv nyob ntawm qhov kub thiab txias. Tsis tas li ntawd, muaj cov yam ntxwv muaj nuj nqis faib rau cov khoom siv hluav taws xob, uas yog hu ua variability.
Kev hloov pauv hauv VF tsis muaj teeb meem thaum cov LEDs ua haujlwm nyob rau hauv qhov kev tsav tam sim no, tab sis rau qhov kev tsav hluav taws xob tas li nws yog ib qho tsim nyog yuav tsum coj cov kev hloov pauv thiab qhov hloov pauv mus rau hauv tus account thaum tsim.

LED Teeb pom kev zoo Circuit Court

[Nyob rau hauv cov ntaub ntawv ntawm ib tug series teeb pom kev zoo Circuit Court]

Thaum teeb pom kev LEDs nyob rau hauv series ntawm qhov tsis tu ncua voltage tsav, lub Circuit Court feem ntau muaj xws li ib tug resistor kev cob cog rua nyob rau hauv series nrog cov LEDs tswj tam sim no.

Rau hom kab hluav taws xob no, ua ntej nyeem cov ntawv xa mus rau tam sim no IF thiab xa mus rau qhov hluav taws xob VF ntawm lub teeb LED los ntawm IF-VF yam ntxwv.
Tus nqi ntawm R (tam sim no tswj tsis kam) yog txiav txim siab los ntawm kev suav los ntawm kev muab cov txiaj ntsig no rau hauv qhov sib npaug saum toj no.

[Nyob rau hauv cov ntaub ntawv ntawm ib tug parallel teeb pom kev zoo Circuit Court]

Rau kev sib txuas ua ke nrog lub zog hluav taws xob tas mus li, peb pom zoo kom muaj kev teeb tsa hluav taws xob uas siv cov kev tswj xyuas qhov hluav taws xob rau txhua qhov LED (uas tau teem ib sab ntawm sab hauv cov teeb pom kev zoo saum toj no).

LED IF-VF cov yam ntxwv yuav txawv nyob ntawm seb cov khoom siv thiab cov xim emitting. Tsis tas li ntawd, kev hloov pauv ntawm tus kheej los ntawm semiconductors muaj nyob txawm tias cov khoom siv thiab cov xim emitting yog tib yam.
Raws li pom nyob rau hauv daim duab hauv qab no, thaum VF ntawm LED ① thiab LED ② txawv, tswj cov tam sim no nrog ib qho resistor ua rau nws nyuaj rau tswj cov tam sim no ntws mus rau txhua LED (IF1 thiab IF2).
Txuas lub resistor rau txhua qhov LED tso cai rau cov dej ntws tam sim no los ntawm ib tus zuj zus (IF1 thiab IF2), ua kom muaj kev hloov kho (piv txwv li kom ua tiav qhov sib txuam tam sim no, txo qis qhov ci ntsa iab). Tsis tas li ntawd, siv lub siab voltage rau lub resistor, xws li los ntawm kev nce lub input voltage Vin, ua rau nws muaj peev xwm mus siv tau tsim uas coj mus rau hauv tus account variations.