Dab tsi yog vim li cas rau lub ripple thiab suab nrov ntawm cov tswj fais fab mov?
Cov zis ntawm qhov hloov hluav taws xob hloov pauv tsis yog qhov hluav taws xob ntshiab DC, tab sis muaj qee yam AC hauv nws, 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. Thaum txhua txoj kev tig thiab tig tawm, lub zog hluav taws xob yog "tso" los ntawm qhov kawg ntawm cov khoom siv mus rau qhov kawg tso tawm, tsim cov txheej txheem them thiab tawm, ua rau muaj qhov hloov pauv ntawm qhov tso zis hluav taws xob, thiab qhov hloov pauv zaus yog tib yam. hloov zaus. Ripple voltage yog lub ncov-rau-peak tus nqi nruab nrab ntawm lub ncov thiab trough ntawm lub ripple, thiab nws qhov luaj li cas yog hais txog lub peev xwm thiab zoo ntawm cov input capacitor thiab tso zis capacitor ntawm lub switching fais fab mov.
Muaj ob qho laj thawj rau lub suab nrov, ib qho yog tsim los ntawm kev hloov hluav taws xob hloov nws tus kheej; lwm qhov yog qhov cuam tshuam (EMI) ntawm sab nraud electromagnetic teb, uas tuaj yeem nkag mus rau lub zog hloov hluav taws xob los ntawm hluav taws xob lossis nkag mus rau lub zog hloov hluav taws xob los ntawm txoj kab hluav taws xob.
Lub suab nrov uas tsim los ntawm lub zog hloov hluav taws xob nws tus kheej yog lub tsheb ciav hlau ceev ceev, uas yog tshwm sim los ntawm cov ntse pulses tshwm sim thaum lub sijhawm hloov pauv thiab tawm, thiab tseem hu ua kev hloov suab nrov. Qhov zaus ntawm lub suab nrov tawg yog ntau dua li qhov hloov zaus, thiab lub suab nrov nrov yog nws qhov siab tshaj-rau-peak tus nqi. 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 tsim ntawm lub PCB.
Ripple thiab suab nrov waveforms tuaj yeem pom nrog lub oscilloscope, raws li pom hauv daim duab 1. Qhov zaus ntawm lub ripple yog tib yam li ntawm lub raj hloov, thiab qhov zaus ntawm lub suab nrov yog ob zaug ntawm lub raj hloov. Cov txiaj ntsig ntawm qhov nruab nrab-rau-npaum tus nqi ntawm qhov ripple voltage thiab lub ncov-rau-peak tus nqi ntawm lub suab nrov yog qhov ripple thiab suab nrov voltage, thiab nws chav tsev yog mVp-p.
Ripple thiab Noise Measurement Methods
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 kom raug yog qhov teeb meem tseem ceeb heev. Tam sim no, txoj kev ntsuas ripple thiab suab nrov yog siv lub broadband oscilloscope, uas tuaj yeem ntsuas qhov ripple thiab suab nrov voltage qhov tseem ceeb.
Vim muaj ntau yam ntawm cov khoom siv hluav taws xob hloov pauv (nrog rau qhov sib txawv topologies, kev khiav hauj lwm zaus, tso zis hluav taws xob, cov kev xav tau sib txawv, thiab lwm yam), txhua qhov chaw tsim khoom siv txoj kev ntsuas oscilloscope. Txhua qhov kev ntsuas muaj lawv tus kheej cov qauv, uas yog cov qauv kev lag luam.
Ib daim duab thaiv ntawm ib lub cuab yeej rau kev ntsuas ripple thiab suab nrov nrog lub oscilloscope yog qhia hauv daim duab 2. Nws muaj cov kev sim hloov fais fab mov, thauj khoom, oscilloscope thiab ntsuas kev sib txuas. Hauv qee cov khoom siv ntsuas, cov khoom siv xws li inductance lossis capacitance thiab kuj tseem welded.
