Thaum lub tsev multilayer ceramic capacitors (MLCCs), hluav taws xob engineers feem ntau xaiv ob hom dielectric nyob ntawm daim ntawv thov - Chav 1, non-ferroelectric khoom dielectrics xws li C0G / NP0, thiab Class 2, ferroelectric khoom dielectrics xws li X5R thiab X7R.Qhov sib txawv tseem ceeb ntawm lawv yog seb lub capacitor, nrog rau qhov nce voltage thiab kub, tseem muaj kev ruaj ntseg zoo.Rau Chav Kawm 1 dielectrics, lub capacitance tseem nyob ruaj khov thaum siv DC voltage thiab kev khiav hauj lwm kub nce;Chav kawm 2 dielectrics muaj qhov siab dielectric tas li (K), tab sis lub capacitance tsis ruaj khov nyob rau hauv kev hloov pauv ntawm qhov kub, qhov hluav taws xob, zaus thiab lub sijhawm dhau mus.
Txawm hais tias lub capacitance tuaj yeem nce ntxiv los ntawm ntau yam kev hloov pauv, xws li hloov qhov chaw ntawm cov txheej txheem electrode, cov txheej txheem ntau, tus nqi K lossis qhov kev ncua deb ntawm ob txheej electrode, lub capacitance ntawm Class 2 dielectrics yuav poob siab thaum. DC voltage yog siv.Qhov no yog vim muaj qhov tshwm sim hu ua DC bias, uas ua rau Chav Kawm 2 ferroelectric formulations nws thiaj li muaj kev poob qis hauv dielectric tas li thaum siv DC voltage.
Rau siab dua K qhov tseem ceeb ntawm cov khoom siv dielectric, cov nyhuv ntawm DC kev tsis ncaj ncees tuaj yeem ua rau hnyav dua, nrog cov capacitors muaj peev xwm poob txog 90% lossis ntau dua ntawm lawv cov peev txheej, raws li qhia hauv daim duab.
Lub zog dielectric ntawm cov khoom siv, piv txwv li qhov voltage uas muab cov khoom tuab tuaj yeem tiv taus, tuaj yeem hloov pauv qhov cuam tshuam ntawm DC kev tsis ncaj ncees ntawm lub capacitor.Hauv Teb Chaws Asmeskas, lub zog dielectric feem ntau yog ntsuas hauv volts / mil (1 mil sib npaug 0.001 nti), lwm qhov nws ntsuas hauv volts / micron, thiab nws txiav txim siab los ntawm cov tuab ntawm txheej dielectric.Yog li ntawd, txawv capacitors nrog tib lub peev xwm thiab qhov ntsuas hluav taws xob tuaj yeem ua qhov txawv txav vim lawv cov qauv sib txawv.
Nws yog ib qho tsim nyog sau cia tias thaum qhov hluav taws xob siv hluav taws xob ntau dua li lub zog dielectric ntawm cov khoom siv, cov khoom siv hluav taws xob yuav dhau los ntawm cov khoom siv, ua rau muaj peev xwm tawg lossis tawg me me.
Cov piv txwv ntawm yuav ua li cas DC kev tsis ncaj ncees raug tsim tawm
Yog tias peb xav txog qhov kev hloov pauv ntawm lub peev xwm vim qhov kev khiav hauj lwm qhov hluav taws xob ua ke nrog kev hloov pauv ntawm qhov kub thiab txias, peb pom tias qhov poob ntawm lub capacitor yuav ntau dua ntawm qhov kev thov tshwj xeeb kub thiab DC voltage.Piv txwv li MLCC ua los ntawm X7R nrog lub peev xwm ntawm 0.1µF, qhov ntsuas hluav taws xob ntawm 200VDC, cov txheej sab hauv suav ntawm 35 thiab tuab ntawm 1.8 mils (0.0018 ntiv tes lossis 45.72 microns), qhov no txhais tau tias thaum ua haujlwm ntawm 200VDC lub dielectric. txheej tsuas yog ntsib 111 volts / mil lossis 4.4 volts / micron.Raws li kev suav ntxhib, VC yuav yog -15%.Yog tias qhov kub thiab txias coefficient ntawm dielectric yog ± 15% ΔC thiab VC yog -15% ΔC, ces qhov siab tshaj TVC yog + 15% - 30% ΔC.
Yog vim li cas rau qhov kev hloov pauv no nyob rau hauv cov qauv siv lead ua ntawm cov khoom siv hauv chav kawm 2 siv - qhov no barium titanate (BaTiO3).Cov khoom siv no muaj cov qauv siv lead ua cubic thaum qhov kub ntawm Curie mus txog lossis siab dua.Txawm li cas los xij, thaum qhov kub thiab txias rov qab mus rau qhov kub thiab txias, polarization tshwm sim vim qhov txo qis ntawm qhov kub thiab txias ua rau cov khoom hloov nws cov qauv.Polarization tshwm sim tsis muaj hluav taws xob sab nraud lossis lub siab thiab qhov no yog hu ua spontaneous polarization lossis ferroelectricity.Thaum DC voltage yog siv rau cov khoom ntawm qhov kub thiab txias, spontaneous polarization txuas mus rau cov kev taw qhia ntawm hluav taws xob teb ntawm DC voltage thiab thim rov qab ntawm tus kheej polarization tshwm sim, ua rau txo qis hauv capacitance.
Niaj hnub no, txawm tias muaj ntau yam khoom siv tsim muaj los ua kom muaj peev xwm, qhov capacitance ntawm Class 2 dielectrics tseem txo qis thaum DC voltage siv vim muaj qhov tshwm sim ntawm DC bias tshwm sim.Yog li ntawd, txhawm rau ua kom ntseeg tau ntev ntev ntawm koj daim ntawv thov, koj yuav tsum tau coj mus rau hauv tus account qhov cuam tshuam ntawm DC kev tsis ncaj ncees ntawm cov khoom ntxiv rau qhov nominal capacitance ntawm MLCC thaum xaiv MLCC.
Zhejiang NeoDen Technology Co., LTD., nrhiav tau nyob rau hauv 2010, yog ib tug kws chaw tsim tshuaj paus tshwj xeeb nyob rau hauv SMT xaiv thiab qhov chaw tshuab, reflow cub, stencil printing tshuab, SMT ntau lawm kab thiab lwm yam SMT khoom.Peb muaj peb tus kheej R & D pab neeg thiab tus kheej lub Hoobkas, ua kom zoo dua ntawm peb tus kheej nplua nuj kev paub R & D, kev cob qhia zoo, tau txais lub koob npe nrov los ntawm cov neeg siv khoom thoob ntiaj teb.
Peb ntseeg tias cov neeg zoo thiab cov neeg koom tes ua rau NeoDen yog ib lub tuam txhab zoo thiab tias peb txoj kev cog lus rau Innovation, Diversity thiab Sustainability kom ntseeg tau tias SMT automation yog siv tau rau txhua tus neeg nyiam nyiam nyob txhua qhov chaw.
Post lub sij hawm: May-05-2023