Yuav ua li cas paub qhov txawv ntawm qhov tsis tu ncua tam sim no thiab qhov tsis tu ncua voltage LED hloov hluav taws xob? Ua ntej, nkag siab tias qhov tam sim no thiab lub siab tsis tu ncua txhais li cas. Tom qab lub tswv yim meej meej, nws yuav yooj yim dua kom paub qhov txawv. Qhov tam sim no tsis tu ncua yog hais txog qhov tam sim no tsis tu ncua, uas txhais tau hais tias cov zis tam sim no tsis tu ncua thiab yuav tsis hloov nrog cov kev hloov pauv hauv cov load. Qhov hluav taws xob tsis tu ncua txhais tau hais tias qhov tso zis hluav taws xob tsis tu ncua thiab yuav tsis hloov nrog kev hloov pauv hauv cov khoom thauj.
Rau cov khoom siv hluav taws xob tsis tu ncua ntawm LED, thaum lub load tso cai, cov zis tam sim no tsis tu ncua thiab tsis hloov nrog kev hloov ntawm lub load.
Rau cov khoom siv hluav taws xob tsis tu ncua ntawm LED, thaum lub zog tso zis hluav taws xob tso cai, cov zis hluav taws xob tsis tu ncua thiab tsis hloov pauv nrog kev hloov ntawm lub load.
Tom qab nkag siab txog cov ntsiab lus tseem ceeb, yuav ua li cas paub qhov txawv?
1. Qhia ncaj qha los ntawm qhov ntsuas qhov ntsuas tsis tau luam tawm ntawm lub zog hluav taws xob LED
Yog tias nws yog qhov hluav taws xob tas li, qhov tso zis hluav taws xob feem ntau yog cim nrog tus nqi ruaj khov, thiab cov zis tam sim no raug cim nrog tus nqi siab tshaj plaws. Raws li pom hauv daim duab hauv qab no, cov zis hluav taws xob tau cim nrog tus nqi tas li ntawm 45VDC, thiab cov zis tam sim no tau cim nrog tus nqi siab tshaj plaws ntawm MAX: 0.5A.
Yog tias nws yog qhov tam sim no tsis tu ncua, qhov tso zis hluav taws xob tau cim nrog ntau yam, thiab cov zis tam sim no raug cim nrog tus nqi ruaj khov. Raws li pom nyob rau hauv daim duab hauv qab no, LED qhov tam sim no qhov tam sim no, qhov tso zis davhlau ya nyob twg yog cim nrog qhov ntsuas hluav taws xob: DC72 ~ 125V, thiab tus qauv tam sim no yog tus nqi ruaj khov: 300mA.
2. Txuas lub load los ntsuas. Thaum lub load hloov, ib qho voltage tseem zoo li qub, ib qho tam sim no tsis hloov, qhov voltage tsis hloov yog qhov tsis tu ncua voltage, thiab qhov tam sim no tsis hloov yog qhov tam sim no tsis tu ncua. Ua ntej siv lub multimeter los ntsuas qhov tsis muaj qhov hluav taws xob tso zis hluav taws xob ntawm LED fais fab mov (yog tias nws yog qhov hluav taws xob tas li, qhov hluav taws xob yog qhov hluav taws xob tso zis, yog tias nws yog qhov chaw tam sim no, qhov hluav taws xob yog qhov siab tshaj qhov tso zis hluav taws xob), thiab ces kwv yees qhov tsim nyog load raws li qhov ntsuas voltage. (Ntshiab kuj tuaj yeem txuas nrog), xws li ntsuas qhov hluav taws xob tom qab txuas 50Ω thiab 100Ω tsis kam feem. Yog tias qhov hluav taws xob tsis hloov pauv, nws yog qhov hluav taws xob tas li, yog tias qhov hluav taws xob hloov pauv hloov pauv, nws yog qhov tam sim no tsis tu ncua. Nco ntsoov tias qhov txuas txuas yuav tsum nyob ze rau lub zog hluav taws xob raws li qhov ua tau Lub zog tso zis, tab sis tsis txhob tshaj qhov tso zis hluav taws xob ntawm lub zog hluav taws xob.
Cov duab hauv qab no qhia txog qhov tam sim no qhov chaw tsav hluav taws xob tsim los ntawm LM317.
Kev nkag siab tob ntawm LED qhov tam sim no tsis tu ncua: qhov tam sim no tsis tu ncua txhais tau tias tam sim no tsis hloov. Raws li U=I * R, vim kuv tsis hloov, cov zis voltage yog proportional rau lub load. Qhov ntau dua qhov impedance ntawm lub load, qhov ntau dua qhov tso zis voltage. Piv txwv li, yog tias qhov tso zis hluav taws xob yog 3V thaum ib qho LED txuas nrog hauv series, qhov tso zis hluav taws xob yog 6V thaum ob lub LED txuas nrog hauv series, thiab cov zis hluav taws xob yog 9V thaum txuas peb LEDs hauv series, thiab lwm yam, kom txog rau thaum qhov siab tshaj plaws. load peev xwm ntawm qhov tam sim no qhov chaw mus txog.
Summary: Qhov chaw tam sim no txhais tau hais tias qhov tso zis tam sim no tsis hloov, thiab qhov hluav taws xob tsis tu ncua txhais tau hais tias qhov tso zis hluav taws xob tsis hloov. Tom qab nkag siab lawv qhov sib txawv, nws yooj yim dua kom paub qhov txawv ntawm lawv. LED teeb nrog qhov zoo dua yog feem ntau tsav los ntawm qhov chaw tam sim no, uas muaj kev ruaj ntseg dua thiab lub neej ntev dua.
