A lokacin da gina multilayer yumbu capacitors (MLCCs), lantarki injiniyoyi sukan zabi iri biyu dielectric dangane da aikace-aikace - Class 1, wadanda ba ferroelectric abu dielectrics kamar C0G/NP0, da kuma Class 2, ferroelectric abu dielectrics kamar X5R da X7R.Babban bambanci tsakanin su shine ko capacitor, tare da haɓaka ƙarfin lantarki da zafin jiki, har yanzu yana da kwanciyar hankali.Don Dielectrics Class 1, ƙarfin ƙarfin ya kasance mai ƙarfi lokacin da aka yi amfani da wutar lantarki na DC kuma zafin aiki ya tashi;Dielectrics Class 2 suna da babban dielectric akai-akai (K), amma ƙarfin ƙarfin ba shi da kwanciyar hankali a ƙarƙashin canje-canjen zafin jiki, ƙarfin lantarki, mita da kan lokaci.
Ko da yake ana iya ƙara ƙarfin ƙarfin ta canje-canjen ƙira daban-daban, kamar canza yanayin farfajiyar yadudduka na lantarki, adadin yadudduka, ƙimar K ko nisa tsakanin yadudduka na lantarki guda biyu, ƙarfin ƙarfin Class 2 dielectrics zai ƙarshe faɗuwa sosai lokacin da ana amfani da wutar lantarki ta DC.Wannan ya faru ne saboda kasancewar wani al'amari da ake kira DC bias, wanda ke haifar da nau'ikan nau'ikan ferroelectric Class 2 don a ƙarshe samun raguwar dielectric akai lokacin da ake amfani da wutar lantarki na DC.
Don mafi girman kimar K na kayan dielectric, tasirin nuna son kai na DC na iya zama mai tsanani, tare da masu iya aiki na iya rasa har zuwa 90% ko fiye na ƙarfin ƙarfin su, kamar yadda aka nuna a cikin zane.
Ƙarfin dielectric na abu, watau ƙarfin lantarki wanda wani kauri na abu zai iya jurewa, zai iya canza tasirin DC a kan capacitor.A cikin Amurka, ana auna ƙarfin dielectric akan volts/mil (mil 1 daidai yake da 0.001 inch), a wani wuri kuma ana auna shi a volts/micron, kuma an ƙaddara shi da kauri na dielectric Layer.A sakamakon haka, daban-daban capacitors tare da wannan capacitance da ƙarfin lantarki rating na iya yin aiki daban-daban saboda daban-daban na ciki tsarin.
Ya kamata a lura da cewa lokacin da wutar lantarki da aka yi amfani da ita ya fi ƙarfin dielectric na kayan aiki, tartsatsi za su wuce ta cikin kayan, wanda zai haifar da yiwuwar ƙonewa ko ƙananan fashewar fashewa.
Misalai masu amfani na yadda ake haifar da son zuciya na DC
Idan muka yi la'akari da canji a cikin capacitance saboda ƙarfin aiki tare da canji a cikin zafin jiki, to, mun gano cewa asarar capacitance na capacitor zai fi girma a ƙayyadaddun yanayin aikace-aikacen da wutar lantarki na DC.Dauki misali MLCC da aka yi da X7R tare da ƙarfin 0.1µF, ƙarfin lantarki mai ƙima na 200VDC, ƙidayar Layer na ciki na 35 da kauri na mil 1.8 (0.0018 inci ko 45.72 microns), wannan yana nufin cewa lokacin aiki a 200VDC dielectric Layer kawai yana samun 111 volts/mil ko 4.4 volts/micron.A matsayin m lissafi, VC zai zama -15%.Idan yawan zafin jiki na dielectric shine ± 15% ΔC kuma VC shine -15% ΔC, to, matsakaicin TVC shine + 15% - 30% ΔC.
Dalilin wannan bambancin ya ta'allaka ne a cikin tsarin crystal na Class 2 abu da aka yi amfani da shi - a wannan yanayin barium titanate (BaTiO3).Wannan abu yana da tsari mai siffar cubic crystal lokacin da zafin Curie ya kai ko sama.Duk da haka, lokacin da zafin jiki ya dawo zuwa yanayin zafi, polarization yana faruwa yayin da rage yawan zafin jiki ya sa kayan su canza tsarinsa.Polarization yana faruwa ba tare da wani filin lantarki na waje ko matsa lamba ba kuma ana kiran wannan da polarization na kwatsam ko ferroelectricity.Lokacin da aka yi amfani da wutar lantarki na DC akan kayan a yanayin zafin yanayi, polarization na kai tsaye yana da alaƙa da jagorancin filin lantarki na ƙarfin wutar lantarki na DC kuma ana samun jujjuyawar polarization ba tare da bata lokaci ba, yana haifar da raguwar ƙarfin aiki.
A zamanin yau, ko da tare da kayan aikin ƙira iri-iri da ake da su don haɓaka ƙarfin ƙarfin ƙarfin ƙarfin darajar Class 2 dielectrics har yanzu yana raguwa sosai lokacin da ake amfani da wutar lantarki ta DC saboda kasancewar abubuwan son rai na DC.Don haka, don tabbatar da amincin aikace-aikacenku na dogon lokaci, kuna buƙatar yin la'akari da tasirin son rai na DC akan sashin ban da ƙarfin ƙima na MLCC lokacin zabar MLCC.
Zhejiang NeoDen Technology Co., LTD., An kafa shi a cikin 2010, ƙwararrun masana'anta ne na ƙwararrun na'ura na SMT da na'ura, tanda mai sake fitarwa, injin bugu na stencil, layin samar da SMT da sauran samfuran SMT.Muna da ƙungiyar R & D da masana'antar mallaka, suna amfani da fa'idodin abubuwan da muka samu R & D, da kyau sosai daga abokan cinikin duniya.
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Lokacin aikawa: Mayu-05-2023