Qhov Ua rau Ripples thiab Suab nrov hauv Hloov Cov Khoom Siv Hluav Taws Xob
Cov zis hluav taws xob hloov pauv tsis yog DC voltage, tab sis muaj qee yam AC hauv, uas yog tshwm sim los ntawm ripple thiab suab nrov. Ripple yog qhov hloov pauv ntawm qhov tso zis DC voltage, uas cuam tshuam nrog kev hloov pauv ntawm lub zog hloov hluav taws xob. Nyob rau hauv txhua txoj kev qhib thiab kaw, hluav taws xob hluav taws xob yog "tso" los ntawm qhov kawg ntawm cov khoom siv mus rau qhov kawg ntawm cov zis, tsim cov txheej txheem ntawm kev them nyiaj thiab tawm, uas ua rau muaj kev hloov pauv ntawm cov zis hluav taws xob, nrog cov zaus zoo ib yam li qhov zaus ntawm qhov hloov. Ripple voltage yog lub ncov rau ncov tus nqi nruab nrab ntawm lub ncov thiab hav ntawm lub ripple, thiab nws qhov loj yog cuam tshuam nrog lub peev xwm thiab qhov zoo ntawm cov tswv yim thiab cov zis capacitors ntawm lub zog hloov pauv.
Muaj ob qhov laj thawj rau lub suab nrov: ib qho yog tsim los ntawm kev hloov hluav taws xob hloov nws tus kheej; Lwm hom yog cuam tshuam los ntawm sab nraud electromagnetic teb (EMI), uas tuaj yeem nkag mus rau lub zog hloov hluav taws xob los ntawm hluav taws xob lossis cov tswv yim los ntawm cov kab hluav taws xob.
Lub suab nrov tsim los ntawm lub zog hloov hluav taws xob nws tus kheej yog lub tsheb ciav hlau ceev ceev uas tshwm sim los ntawm cov pulses ntse tsim thaum lub sijhawm hloov pauv thiab txiav tawm, tseem hu ua kev hloov suab nrov. Qhov zaus ntawm lub suab nrov pulse tsheb ciav hlau yog ntau dua li qhov hloov zaus, thiab lub suab nrov nrov yog nws qhov siab tshaj plaws rau cov nqi siab tshaj. Lub amplitude ntawm lub suab nrov voltage feem ntau muaj feem xyuam rau lub topology ntawm lub switching fais fab mov, lub parasitic xeev nyob rau hauv lub Circuit Court, thiab tus tsim ntawm lub PCB.
Lub waveform ntawm ripple thiab suab nrov tuaj yeem pom tau siv lub oscilloscope, raws li pom hauv daim duab 1. Qhov zaus ntawm lub ripple yog tib yam li qhov zaus ntawm lub raj hloov, thaum lub suab nrov yog ob zaug ntawm lub raj hloov. Qhov sum ntawm lub ncov rau lub ncov qhov tseem ceeb ntawm ripple voltage thiab suab nrov voltage yog lub ripple thiab suab nrov voltage, qhia nyob rau hauv mVp-p.
Kev ntsuas txoj kev ripple thiab suab nrov
Ripple thiab suab nrov voltage yog ib qho ntawm cov kev ua haujlwm tseem ceeb ntawm kev hloov cov khoom siv hluav taws xob, yog li yuav ua li cas ntsuas lawv yog qhov tseem ceeb heev. Tam sim no, txoj kev ntsuas ripple thiab suab nrov voltage yog siv broadband oscilloscope, uas tuaj yeem ntsuas qhov ripple thiab suab nrov qhov tseem ceeb.
Vim muaj ntau yam khoom siv hluav taws xob hloov pauv (nrog rau qhov sib txawv topologies, kev khiav hauj lwm zaus, tso zis hluav taws xob, thiab kev xav tau), ntau lub tuam txhab siv cov kev ntsuas oscilloscope, thiab cov cuab yeej ntsuas tsis zoo ib yam. Yog li ntawd, txhua lub Hoobkas muaj nws tus qauv rau kev ntsuas cov khoom siv hluav taws xob sib txawv, uas yog tus qauv kev lag luam.
Daim duab thaiv ntawm lub cuab yeej rau kev ntsuas ripple thiab suab nrov uas siv lub oscilloscope yog qhia hauv daim duab 2. Nws muaj qhov ntsuas qhov ntsuas hluav taws xob hloov hluav taws xob, thauj khoom, oscilloscope, thiab ntsuas qhov thaiv. Qee cov khoom siv ntsuas kuj muaj cov khoom siv xws li inductors, capacitors, thiab resistors soldered rau lawv.
