Txoj kev ua haujlwm ntawm DC tswj fais fab mov:
Qhib lub hwj chim hloov ua ntej thiab teem caij tam sim no. Vim hais tias cov zis davhlau ya nyob twg yuav tsum tau luv luv-circuited thaum teeb tsa tam sim no, txhawm rau tiv thaiv qhov cuam tshuam tam sim no, ua ntej txo qhov hluav taws xob mus txog 1Ⅴ, thiab tom qab ntawd luv-circuited cov zis terminals ntawm lub hwj huam mov ua ke. Lub sijhawm no, qhov hluav taws xob ntawm voltmeter yuav poob mus rau zero volts. Thiab lub ammeter pib tso saib tus nqi tam sim no.
Kho qhov tam sim no nyob ib ncig ntawm 1.8A los ntawm coarsely kho cov pob qhov rooj tam sim no, thiab tom qab ntawd kho kom zoo rau 1.8A. Cais qhov zoo thiab qhov tsis zoo ntawm cov zis los xaus rau lub xeev luv luv. Lub sijhawm no, tam sim no ploj mus thiab qhov hluav taws xob rov qab mus rau lub xeev ua ntej qhov teeb tsa.
Kev hloov kho qhov hluav taws xob tom ntej yog qhov yooj yim, tsuas yog kho ob lub pob hluav taws xob los kho qhov hluav taws xob mus rau 12.6V.
Nws yog qhov tsim nyog rau hom khoom siv hluav taws xob kom ua tiav qhov tam sim no lossis qhov hluav taws xob tas li. Nws tsis yog tias muaj qhov tsis xws luag hauv kev ua haujlwm ntawm lub hwj chim, tab sis nws yog txiav txim los ntawm Ohm txoj cai. Piv txwv li, saum toj no 12.6V thiab 1.8A, thaum lub load fais fab txuas nrog lub hwj chim mov me me, tam sim no tsis ncav cuag 1.8A, thiab lub hwj huam mov tso zis yog nyob rau hauv ib tug tas li voltage lub xeev. Lub sijhawm no, tam sim no hloov pauv ntawm 0 mus rau 1.8A, thiab 12.6V yuav nyob twj ywm. Qhov teeb tsa tam sim no tsis muaj txiaj ntsig.
Yog tias koj xav txuas ntxiv mus ntxiv qhov tso zis hluav taws xob, koj yuav pom tias thaum tam sim no nce mus txog 1.8A, qhov hluav taws xob tsis tuaj yeem nce ntxiv, vim tias cov khoom siv hluav taws xob tau nkag mus rau lub xeev tam sim no txij thaum ntawd los.
Tab sis thaum lub zog load nce thiab tam sim no tshaj 1.8A, piv txwv li, ib tug 5Ω high-power resistor txuas nrog. Raws li Ohm txoj cai U/R=l, 12.6Ⅴ ÷ 5Ω= 2.52A, txij li tam sim no tau teeb tsa rau 1.8A, qhov tso zis hluav taws xob ntawm cov khoom siv hluav taws xob yuav qis qis rau 9Ⅴ ( 1.8Aⅹ5Ω) kom ua tau raws li qhov yuav tsum tau muaj ntawm cov txheej txheem tam sim no. Nws tuaj yeem pom tias nws tsis tuaj yeem ua tiav qhov tam sim no thiab qhov hluav taws xob tsis tu ncua tib lub sijhawm, uas yog, qhov tam sim no tsis tu ncua tsis tu ncua, thiab qhov hluav taws xob tsis tu ncua tsis tas li tam sim no.
Qhov kev ua haujlwm tam sim no tsis tu ncua yog qhov muaj txiaj ntsig zoo thaum ntsuas LED qhov chaw teeb pom kev zoo. Piv txwv li, thaum ntsuas 1W teeb hlaws, qhov tam sim no tuaj yeem teeb tsa rau 0.3A, thiab qhov hluav taws xob tuaj yeem raug teeb tsa rau 4 ~ 5V (me ntsis siab dua ⅤF). Yog hais tias lub voltmeter qhia 3.15Ⅴ, uas yog ⅤF tus nqi ntawm lub teeb hlaws, lub teeb los yog lub teeb hlaws tuaj yeem yooj yim cais thiab tshuaj xyuas.
