Yam dab tsi yuav tsum tau xav txog thaum xaiv lub zog hloov hluav taws xob?
Kev xaiv cov khoom siv hluav taws xob hloov pauv yog txheej txheem uas cov kws tsim khoom yuav tsum ua kom tiav txhua zaus lawv npaj lub hwj chim. Nyob rau saum npoo, nws yog ib lo lus nug ntau yam, tab sis qhov tseeb, engineers yuav tsum xav txog ntau yam ua ntej xaiv qhov kawg. Tau kawg, thawj qhov peb xav txog yog Nws yuav yog qhov teeb meem nqi. Qhov kuv xav piav qhia hauv tsab xov xwm niaj hnub no yog tias ntxiv rau tus nqi, nyob rau hauv tus txheej txheem ntawm kev hloov cov khoom siv hluav taws xob, peb yuav tsum tau ua tib zoo saib rau qee yam hauv lub cev txhawm rau xaiv lub hwj huam tsim nyog tshaj plaws.
Hais txog kev xaiv ntawm kev hloov cov khoom siv hluav taws xob, peb yuav tsum tau ua tib zoo saib thiab xav txog ntau txoj cai. Piv txwv li, tus nqi nominal ntawm kev ruaj ntseg hlau yog 1A, uas yog hais txog lub hom phiaj ntawm 25 degrees. Txawm li cas los xij, yog tias cov cuab yeej ua haujlwm ntawm 50 degrees, tus nqi nominal ntawm txoj hlua ruaj ntseg yuav qis dua 1A. Cov phiaj xwm phiaj xwm ntawm qhov ntsuas kub no yuav tsum raug xaiv. Ib me ntsis loj. Ib yam li ntawd, 1mH ntawm inductor tsis yog 1mH txhua lub sijhawm. Nws yog 1 kHz. Yog tias koj siv nws ntawm 1MHz, tus nqi ntawm 1mH inductor xa los ntawm tus processor tsis yog 1mH, vim tias tus nqi hauv inductor kauj yog 1M. Kev faib tawm capacitance pib muaj kev cuam tshuam loj thiab yuav cuam tshuam qee qhov cuam tshuam ntawm inductance. Qhov poob ntawm cov lim IL=25dB yog thaum MHz Rs/RL=50 ohms (qhov chaw impedance thiab load impedance). Qhov tseeb, hauv peb lub vev xaib daim ntawv thov lim, nws yog qhov nyuaj rau kev ua tiav qhov impedance kom tau raws li qhov yuav tsum tau ua, yog li 25dB Qhov kev tso tawm yuav raug txo qis heev. Sib nqus hlaws, capacitors, diodes, resistors ... txhua tus muaj cov cai zoo sib xws. Wb tham txog cov kev cai rau kev xaiv switching power supply modules ntxiv rau tus nqi. Muaj ntau cov qauv topological ntawm lub hwj chim modules, nrog rau flyback, rau pem hauv ntej, thawb-rub, ib nrab-bridge, thiab tag nrho-bridge. Txhua tus ntawm lawv muaj cov hauv paus ntsiab lus sib txawv thiab tseem muaj kev cuam tshuam hauv nws qhov kev ua tau zoo hauv qee qhov ntsuas kev ua tau zoo.
Ntawm no peb yuav piav qhia txog kev siv cov cai ntawm ntau yam topologies. Thawj yog lub flyback fais fab mov, uas tsis tso tawm thaum lub sij hawm them nyiaj thaum lub voj voog hloov. Vim tias cov yam ntxwv no, nws yog ib qho nyuaj rau kev ua tiav cov yam ntxwv ntawm lub sijhawm zoo thiab cov yam ntxwv ripple, txawm tias nws tuaj yeem ua tiav los ntawm lub zog loj. Capacitors tuaj yeem pab daws nws me ntsis, tab sis qhov tsis txaus ntseeg yog qhov kawg ntawm qhov tsis zoo. Tsis muaj kev txawj ntse tuaj yeem tau txais txiaj ntsig los ntawm kev ua haujlwm nyuaj, tab sis thaum koj ntsib teeb meem tseem ceeb, koj tsis tuaj yeem kov yeej qee qhov teeb meem tom qab tsim nws. Kuj tseem muaj teeb meem xws li cov xau loj inductance, tab sis nws qhov zoo yog qhov yooj yim Circuit Court, tsis tshua muaj nqi, me me, tsis tas yuav ntxiv cov hlau nplaum reset winding, thiab cov tswv yim voltage input kuj dav. Nws yog qhov tseeb vim qhov no tias nws suav nrog ntau dua 70% ntawm tag nrho cov khoom siv hluav taws xob.
