Muaj ob txoj hauv kev ntawm hluav taws xob tam sim no. Cov no yog cov tam sim no ncaj qha (DC) thiab hloov tam sim no (AC).
Direct tam sim no yog ib txoj hauv kev uas hluav taws xob ib txwm ntws mus rau hauv ib qho kev taw qhia, piv rau qhov ntws ntawm tus dej. Nws hais txog kev khiav ntawm hluav taws xob tau los ntawm cov roj teeb, lub hnub ci hlwb, thiab lwm yam.
Ntawm qhov tod tes, alternating tam sim no (AC) yog ib txoj hauv kev uas cov sab zoo thiab qhov tsis zoo tau hloov mus tas li thiab cov kev taw qhia ntawm cov hluav taws xob hloov pauv raws li. Qhov no yog qhov ntws ntawm hluav taws xob tau txais los ntawm lub tshuab hluav taws xob lossis qhov hluav taws xob. Cov hluav taws xob uas tsim los ntawm cov chaw tsim hluav taws xob thiab xa mus rau hauv tsev kuj tseem kis tau raws li qhov hloov pauv tam sim no.
Nyob rau hauv ncaj qha tam sim no, qhov voltage yog tas li, thiab cov hluav taws xob ntws nyob rau hauv ib qho kev taw qhia. Nyob rau hauv sib piv, nyob rau hauv alternating tam sim no, lub voltage ncua sij hawm hloov ntawm qhov zoo mus rau qhov tsis zoo thiab los ntawm qhov tsis zoo mus rau qhov zoo, thiab cov kev taw qhia ntawm tam sim no kuj hloov raws sij hawm.
Qhov zoo ntawm DC tshaj AC
Tsis muaj kev ua ntej lossis ncua sijhawm hauv Circuit Court
Nyob rau hauv alternating tam sim no, cov kev taw qhia ntawm lub tam sim no hloov tas li. Yog li ntawd, thaum lub capacitor los yog inductor nyob rau hauv lub Circuit Court, piv txwv li, muaj ib tug ncua sij hawm los yog ua ntej nyob rau hauv lub tam sim no ntws mus rau lub load nyob rau hauv relation mus rau lub voltage tus cwj pwm.
Txawm li cas los xij, nrog rau tam sim no ncaj qha, qhov hluav taws xob thiab kev taw qhia ntawm qhov tam sim no ib txwm nyob tas li, yog li tus cwj pwm ntawm cov capacitors thiab coils kuj tseem nyob tas li. Yog li ntawd, hauv DC, tsis muaj kev ua ntej lossis ncua sijhawm hauv Circuit Court.
Tsis muaj reactive zog yog generated
Nyob rau hauv alternating tam sim no (AC), cov kev taw qhia ntawm lub tam sim no yog switched, yog li tsis yog tag nrho cov hluav taws xob kis tau los ntawm lub load, thiab ib co zog yog generated tsuas yog rov qab mus rau lub load thiab lub hwj chim qhov chaw. Qhov no hu ua reactive zog.
Nyob rau hauv ncaj qha tam sim no, tag nrho cov hluav taws xob dhau los ntawm lub load vim hais tias tam sim no ib txwm ntws nyob rau hauv ib tug tas mus li kev taw qhia. Nov yog daim duab ntawm scallop raug thawb tawm. Yog li ntawd, tsis muaj reactive zog yog generated thiab lub hwj chim yuav siv tau zoo.
Muaj peev xwm khaws tau hluav taws xob
Lwm qhov zoo ntawm cov khoom siv hluav taws xob ncaj qha yog tias nws tuaj yeem khaws cia los ntawm cov roj teeb, roj teeb, capacitors, thiab lwm yam.
Qhov tsis zoo ntawm
Disadvantages ntawm DC tshaj AC
Kev cuam tshuam tam sim no nyuaj
Ntawm qhov tod tes, ncaj qha tam sim no kuj muaj nws qhov tsis zoo. Ib qho ntawm lawv yog qhov nyuaj rau kev cuam tshuam tam sim no. Txij li thaum qhov hluav taws xob tsis tu ncua yog ib txwm siv rau cov tam sim no ncaj qha, tshwj xeeb tshaj yog thaum muaj qhov hluav taws xob siab, teeb meem xws li arcs (sparks) yuav tshwm sim thaum lub sijhawm cuam tshuam, lossis tej zaum yuav muaj kev pheej hmoo ntawm hluav taws xob poob rau hauv ib puag ncig.
Nyob rau hauv cov ntaub ntawv ntawm alternating tam sim no, thaum lub voltage hloov ntawm zoo mus rau qhov tsis zoo los yog tsis zoo mus rau qhov zoo, lub voltage momentarily poob mus rau xoom. Yog tias koj tsom rau lub sijhawm thaum qhov hluav taws xob qis, koj tuaj yeem cuam tshuam qhov tam sim no yam xyuam xim ntau dua li qhov ncaj qha tam sim no.
Yooj yim hloov voltage
Thaum hloov DC voltage, nws yuav tsum hloov mus rau AC ib zaug thiab rov qab mus rau DC dua. Vim li no, cov khoom siv hluav taws xob hloov hluav taws xob DC loj dua thiab kim dua AC.
Muaj zog electrolytic nyhuv
Direct tam sim no yog qhov hnyav corrosion ntawm cov kav dej hauv av thiab cov insulators xav tau rau kev xa hluav taws xob. Txij li thaum hluav taws xob ib txwm ntws mus rau tib qho kev taw qhia hauv DC, corrosion ntawm cov khoom siv hluav taws xob sib kis tau nce vim electrostatic induction thiab hluav taws xob corrosion.
Nws yog tam sim no ncaj qha los ntawm cov khoom khaws cia xws li cov roj teeb, roj teeb, thiab cov khoom siv hluav taws xob. Yog li ntawd, cov khoom siv hluav taws xob los ntawm cov roj teeb tau sib xws nrog cov khoom siv hluav taws xob ncaj qha.
Ntawm qhov tod tes, cov khoom siv hluav taws xob hauv tsev nruab nrab yog AC tam sim no, tab sis dab tsi yog siv hauv cov khoom siv hluav taws xob xws li khoos phis tawj thiab cov khoom siv hauv tsev xws li TV yog DC tam sim no. Txhawm rau khiav cov khoom siv zoo li no, AC ntawm lub qhov hluav taws xob hloov mus rau DC siv cov khoom siv hluav taws xob thiab lwm yam khoom siv.
Txawm li cas los xij, nyob rau hauv cov ntaub ntawv chaw uas DC tam sim no feem ntau yog siv, kev siv DC fais fab mov raug txhawb kom txo tau qhov poob thaum hloov AC rau DC.