Pomanga ma multilayer ceramic capacitors (MLCCs), akatswiri opanga magetsi nthawi zambiri amasankha mitundu iwiri ya dielectric malinga ndi ntchito - Kalasi 1, ma dielectric akuthupi osagwiritsa ntchito ferroelectric monga C0G/NP0, ndi Class 2, ma dielectric amtundu wa ferroelectric monga X5R ndi X7R.Kusiyanitsa kwakukulu pakati pawo ndikuti capacitor, ndi mphamvu yowonjezera ndi kutentha, akadali ndi kukhazikika kwabwino.Kwa Class 1 dielectrics, capacitance imakhalabe yokhazikika pamene magetsi a DC amagwiritsidwa ntchito ndipo kutentha kwa ntchito kumakwera;Ma dielectric a Class 2 amakhala ndi ma dielectric okhazikika (K), koma mphamvuyo imakhala yosakhazikika pakusintha kwa kutentha, magetsi, ma frequency ndi nthawi.
Ngakhale capacitance akhoza ziwonjezeke ndi kusintha osiyanasiyana kamangidwe, monga kusintha pamwamba pa dera la elekitirodi zigawo, chiwerengero cha zigawo, K mtengo kapena mtunda pakati pa zigawo ziwiri elekitirodi, capacitance wa Class 2 dielectrics potsiriza adzatsika kwambiri pamene. voteji ya DC imayikidwa.Izi zimachitika chifukwa cha kupezeka kwa chinthu chotchedwa DC bias, chomwe chimapangitsa kuti ma Class 2 ferroelectric formulations pamapeto pake atsike kutsika kwa dielectric nthawi zonse pomwe magetsi a DC ayikidwa.
Pazinthu zapamwamba za K za zida za dielectric, zotsatira za kukondera kwa DC zitha kukhala zowopsa kwambiri, pomwe ma capacitor amatha kutaya mpaka 90% kapena kupitilira apo, monga momwe zasonyezedwera pachithunzichi.
Mphamvu ya dielectric ya chinthu, mwachitsanzo, voliyumu yomwe makulidwe opatsidwa amatha kupirira, amathanso kusintha momwe DC imathandizira pa capacitor.Ku USA, mphamvu ya dielectric nthawi zambiri imayesedwa mu volts/mil (1 mil ndi 0.001 inchi), kwina imayesedwa ndi volts/micron, ndipo imatsimikiziridwa ndi makulidwe a dielectric wosanjikiza.Zotsatira zake, ma capacitor osiyanasiyana omwe ali ndi mphamvu yofanana ndi ma voliyumu amatha kuchita mosiyana kwambiri chifukwa chamitundu yosiyanasiyana yamkati.
Ndikoyenera kudziwa kuti mphamvu yogwiritsidwa ntchito ikakhala yayikulu kuposa mphamvu ya dielectric ya zinthuzo, zowala zimadutsa muzinthuzo, zomwe zimapangitsa kuti pakhale ngozi yoyaka kapena kuphulika pang'ono.
Zitsanzo zothandiza za momwe kukondera kwa DC kumapangidwira
Ngati tiganizira kusintha capacitance chifukwa voteji ntchito molumikizana ndi kusintha kutentha, ndiye ife tikupeza kuti capacitance imfa ya capacitor adzakhala wamkulu pa yeniyeni ntchito kutentha ndi DC voteji.Tengani mwachitsanzo MLCC yopangidwa ndi X7R yokhala ndi mphamvu ya 0.1µF, voliyumu yovoteledwa ya 200VDC, kuchuluka kwamkati kwa 35 ndi makulidwe a 1.8 mils (0.0018 mainchesi kapena ma microns 45.72), izi zikutanthauza kuti pogwira ntchito pa 200VDC dielectric wosanjikiza amangokumana ndi 111 volts/mil kapena 4.4 volts/micron.Monga mawerengedwe ovuta, VC ikanakhala -15%.Ngati kutentha kwa kutentha kwa dielectric ndi ± 15% ΔC ndi VC ndi -15% ΔC, ndiye kuti TVC yapamwamba ndi + 15% - 30% ΔC.
Chifukwa cha kusiyana kumeneku kuli mu mawonekedwe a kristalo a zinthu za Class 2 zomwe zimagwiritsidwa ntchito - pamenepa barium titanate (BaTiO3).Nkhaniyi ili ndi mawonekedwe a kristalo wa cubic pamene kutentha kwa Curie kumafika kapena pamwamba.Komabe, kutentha kumabwereranso ku kutentha kozungulira, polarization imachitika pamene kutsika kwa kutentha kumapangitsa kuti zinthu zisinthe.Polarization imachitika popanda gawo lililonse lamagetsi lakunja kapena kukakamizidwa ndipo izi zimadziwika kuti polarization kapena ferroelectricity.Mphamvu yamagetsi ya DC ikagwiritsidwa ntchito pazinthu zotentha zozungulira, polarization yodziwikiratu imalumikizidwa ndi gawo lamagetsi amagetsi a DC ndipo kusinthika kwapolarization kumachitika, zomwe zimapangitsa kuchepa kwa mphamvu.
Masiku ano, ngakhale ndi zida zosiyanasiyana zamapangidwe zomwe zilipo kuti ziwonjezere mphamvu, mphamvu ya ma dielectric a Class 2 imatsikabe kwambiri pamene magetsi a DC amagwiritsidwa ntchito chifukwa cha kupezeka kwa DC bias phenomenon.Chifukwa chake, kuti mutsimikizire kudalirika kwanthawi yayitali kwa ntchito yanu, muyenera kuganizira zotsatira za kukondera kwa DC pachigawocho kuwonjezera pa kuthekera kwadzina kwa MLCC posankha MLCC.
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Nthawi yotumiza: May-05-2023