Inductance yog ib feem tseem ceeb ntawm DC / DC fais fab mov.Muaj ntau yam yuav tsum tau xav txog thaum xaiv ib qho inductor, xws li tus nqi inductance, DCR, qhov loj me, thiab saturation tam sim no.Cov yam ntxwv saturation ntawm inductors feem ntau to taub yuam kev thiab ua rau muaj teeb meem.Daim ntawv no yuav tham txog yuav ua li cas cov inductance mus txog saturation, yuav ua li cas saturation cuam tshuam rau lub Circuit Court, thiab cov txheej txheem ntawm kev kuaj inductance saturation.
Inductance saturation ua rau
Ua ntej, intuitively to taub dab tsi inductance saturation yog, raws li qhia nyob rau hauv daim duab 1:
Daim duab 1
Peb paub tias thaum muaj qhov tam sim no dhau los ntawm lub kauj hauv daim duab 1, lub kauj yuav ua kom muaj qhov sib nqus;
Cov tub ntxhais hlau nplaum yuav raug magnetized nyob rau hauv qhov kev txiav txim ntawm lub magnetic teb, thiab lub sab hauv magnetic domains yuav maj mam tig.
Thaum lub magnetic core yog magnetized kiag li, cov kev taw qhia ntawm lub magnetic domain yog tib yam li lub magnetic teb, txawm tias sab nraud magnetic teb yog nce, lub magnetic core tsis muaj magnetic domain uas yuav tig, thiab inductance nkag mus rau hauv lub saturated lub xeev. .
Los ntawm lwm qhov kev pom, nyob rau hauv lub magnetization nkhaus qhia nyob rau hauv daim duab 2, kev sib raug zoo ntawm magnetic flux ceev B thiab magnetic teb zog H ua tau raws li tus qauv ntawm sab xis nyob rau hauv daim duab 2:
Thaum qhov sib nqus flux ceev mus txog Bm, qhov sib nqus flux ceev tsis nce ntxiv lawm nrog kev nce ntawm qhov sib nqus ntawm qhov sib nqus, thiab qhov inductance ncav cuag saturation.
Los ntawm kev sib raug zoo ntawm inductance thiab permeability µ, peb tuaj yeem pom:
Thaum cov inductance saturated, lub µm yuav raug txo kom tsawg, thiab thaum kawg lub inductance yuav txo tau zoo heev thiab lub peev xwm los suppress tam sim no yuav ploj.
Daim duab 2
Cov lus qhia rau kev txiav txim siab inductance saturation
Puas muaj cov lus qhia rau kev txiav txim siab inductance saturation hauv kev siv tswv yim?
Nws tuaj yeem muab faib ua ob pawg tseem ceeb: kev suav theoretical thiab kev sim ntsuas.
☆Kev suav cov theoretical tuaj yeem pib los ntawm qhov siab tshaj plaws sib nqus flux ceev thiab qhov siab tshaj plaws inductance tam sim no.
☆Qhov kev sim sim no feem ntau tsom rau qhov inductance tam sim no waveform thiab lwm yam kev txiav txim ua ntej.
Cov txheej txheem no tau piav qhia hauv qab no.
Xam qhov sib nqus flux ceev
Txoj kev no yog tsim los tsim inductance siv cov tub ntxhais sib nqus.Core tsis muaj xws li sib nqus Circuit Court ntev le, zoo cheeb tsam Ae thiab lwm yam.Hom magnetic core kuj txiav txim siab cov khoom sib nqus sib nqus, thiab cov khoom sib nqus ua rau cov kev cai sib txuam ntawm qhov poob ntawm cov hlau nplaum thiab cov saturation magnetic flux ntom.
Nrog rau cov ntaub ntawv no, peb tuaj yeem xam qhov siab tshaj plaws sib nqus flux ceev raws li qhov tseeb tsim, raws li hauv qab no:
Hauv kev xyaum, kev suav tuaj yeem ua kom yooj yim, siv ui hloov ur;Thaum kawg, piv nrog cov saturation flux ceev ntawm cov khoom sib nqus, peb tuaj yeem txiav txim siab seb qhov tsim inductance puas muaj kev pheej hmoo ntawm saturation.
Xam qhov siab tshaj plaws inductance tam sim no
Txoj kev no tsim nyog rau kev tsim hluav taws xob ncaj qha los ntawm kev siv cov inductors tiav.
Txawv Circuit Court topologies muaj cov qauv sib txawv rau kev suav inductance tam sim no.
Siv Buck nti MP2145 ua piv txwv, nws tuaj yeem suav tau raws li cov qauv hauv qab no, thiab cov txiaj ntsig suav tuaj yeem muab piv nrog tus nqi inductance specification los txiav txim seb qhov inductance puas yuav saturated.
Kev txiav txim los ntawm inductive tam sim no waveform
Txoj kev no kuj yog txoj kev siv ntau tshaj plaws thiab siv tau hauv kev xyaum ua engineering.
Noj MP2145 ua piv txwv, MPSmart simulation cuab yeej yog siv rau simulation.Los ntawm kev simulation waveform, nws tuaj yeem pom tau tias thaum lub inductor tsis saturated, lub inductor tam sim no yog daim duab peb sab yoj nrog ib qho kev nqes hav.Thaum cov inductor saturated, inductor tam sim no waveform yuav muaj qhov pom tseeb distortion, uas yog tshwm sim los ntawm qhov txo qis ntawm inductance tom qab saturation.
Hauv kev xyaum ua engineering, peb tuaj yeem soj ntsuam seb puas muaj kev cuam tshuam ntawm inductance tam sim no waveform raws li qhov no los txiav txim seb qhov inductance puas txaus.
Hauv qab no yog qhov ntsuas waveform ntawm MP2145 Demo board.Nws tuaj yeem pom tau tias muaj qhov pom tseeb distortion tom qab saturation, uas zoo ib yam nrog cov txiaj ntsig simulation.
Ntsuas seb qhov inductance puas txawv txav thiab mloog qhov txawv txav whistling
Muaj ntau qhov xwm txheej hauv kev ua haujlwm engineering, peb yuav tsis paub qhov tseeb ntawm cov tub ntxhais kawm, nws yog qhov nyuaj rau paub qhov inductance saturation tam sim no loj, thiab qee zaum nws tsis yooj yim rau kev sim cov inductance tam sim no;Nyob rau lub sijhawm no, peb tseem tuaj yeem txiav txim siab ua ntej seb qhov saturation tau tshwm sim los ntawm kev ntsuas seb qhov inductance puas muaj qhov kub thiab txias, lossis mloog seb puas muaj qhov txawv txav.
Ob peb lub tswv yim rau kev txiav txim siab inductance saturation tau qhia ntawm no.Kuv vam tias nws yuav pab tau.
Lub sij hawm xa tuaj: Plaub Hlis-07-2023