Paunenge uchivaka multilayer ceramic capacitors (MLCCs), mainjiniya emagetsi anowanzo sarudza marudzi maviri edielectric zvichienderana nekushandiswa - Kirasi 1, isiri-ferroelectric zvinhu dielectrics seC0G/NP0, uye Kirasi 2, ferroelectric zvinhu dielectrics seX5R uye X7R.Musiyano wakakosha pakati pavo ndewekuti iyo capacitor, nekuwedzera voltage uye tembiricha, ichine kugadzikana kwakanaka.Kune Kirasi 1 dielectrics, iyo capacitance inoramba yakagadzikana kana DC voltage inoshandiswa uye tembiricha yekushanda ichikwira;Kirasi 2 dielectrics ine yakakwira dielectric constant (K), asi capacitance haina kugadzikana pasi pekuchinja kwekushisa, voltage, frequency uye nekufamba kwenguva.
Kunyangwe iyo capacitance inogona kuwedzerwa neyakasiyana dhizaini shanduko, sekuchinja nzvimbo yenzvimbo yemagetsi emagetsi, huwandu hwezvikamu, kukosha kweK kana chinhambwe chiri pakati pezvikamu zviviri zve electrode, kugona kweClass 2 dielectrics inozopedzisira yadonha zvakanyanya kana. DC voltage inoshandiswa.Izvi zvinokonzerwa nekuvapo kwechiitiko chinodaidzwa kuti DC bias, izvo zvinoita kuti Class 2 ferroelectric formulations inopedzisira yawana kudonha kwedielectric constant kana DC voltage yaiswa.
Kune yakakwirira K kukosha kwezvinhu zvedielectric, mhedzisiro yeDC bias inogona kutonyanya kuomarara, nema capacitor angangorasikirwa ne90% kana kupfuura yehukwanisi hwavo, sezvakaratidzwa mudhayagiramu.
Iyo dielectric simba rechinhu, kureva voltage iyo yakapihwa ukobvu yezvinhu inogona kumira, inogona zvakare kushandura mhedzisiro yeDC bias pane capacitor.MuU.SA, simba redhielectric rinowanzoyerwa mu volts/mil (1 mil yakaenzana ne 0.001 inch), kumwewo rinoyerwa nemavolts/micron, uye rinotariswa nekukora kwedielectric layer.Nekuda kweizvozvo, akasiyana capacitor ane yakafanana capacitance uye voltage rating anogona kuita zvakasiyana zvakanyanya nekuda kweakasiyana maumbirwo emukati.
Izvo zvakakosha kucherechedza kuti kana iyo voltage yakashandiswa yakakura kupfuura simba re dielectric rechinhu, sparks dzinopfuura nepakati pezvinhu, zvichitungamira kune inogona kubatika kana diki-chikamu njodzi yekuputika.
Mienzaniso inoshanda yekuti DC bias inogadzirwa sei
Kana tikafunga shanduko ye capacitance nekuda kweiyo yekushanda voltage pamwe chete nekuchinja kwekushisa, saka tinoona kuti capacitance kurasikirwa kwecapacitor ichave yakakura pane chaiyo application tembiricha uye DC voltage.Tora semuenzaniso MLCC yakagadzirwa neX7R ine capacitance ye0.1µF, rated voltage ye200VDC, yemukati layer inosvika makumi matatu nemashanu uye ukobvu hwe1.8 mils (0.0018 inches kana 45.72 microns), izvi zvinoreva kuti kana uchishanda pa200VDC iyo dielectric. layer inongosangana ne111 volts/mil kana 4.4 volts/micron.Sekuverenga kwakashata, iyo VC yaizova -15%.Kana iyo tembiricha coefficient ye dielectric iri ± 15% ΔC uye VC iri -15% ΔC, ipapo iyo yakanyanya TVC ndeye + 15% - 30% ΔC.
Chikonzero chekusiyana uku chiri mukristaro chimiro cheClass 2 zvinhu zvakashandiswa - munyaya iyi barium titanate (BaTiO3).Ichi chinyorwa chine cubic crystal chimiro kana tembiricha yeCurie yasvika kana pamusoro.Nekudaro, kana tembiricha yadzokera kune ambient tembiricha, polarization inoitika sezvo kudzikira kwekushisa kuchikonzera kuti zvinhu zvichinje chimiro chayo.Polarization inoitika pasina chero ekunze munda wemagetsi kana kudzvanywa uye izvi zvinozivikanwa sekuzviitira polarization kana ferroelectricity.Kana magetsi eDC akaiswa kune zvinhu patembiricha ye ambient, polarization inongoerekana yabatanidzwa kune kutungamira kwenzvimbo yemagetsi yeDC voltage uye kudzoreredzwa kwepolarization kunoitika, zvichikonzera kudzikiswa kwesimba.
Mazuvano, kunyangwe nematurusi akasiyana ekugadzira aripo kuti awedzere kugona, kugona kweClass 2 dielectrics kuchiri kudzikira zvakanyanya kana DC voltage yaiswa nekuda kwekuvapo kweDC bias phenomenon.Naizvozvo, kuti uve nechokwadi chekuvimbika kwenguva refu kwechikumbiro chako, unofanirwa kufunga nezve mhedzisiro yeDC bias pane chikamu mukuwedzera kune zita rekuti capacitance yeMLCC paunosarudza MLCC.
Zhejiang NeoDen Technology Co., LTD., yakavambwa muna 2010, inyanzvi inogadzira nyanzvi muSMT pick and place machine, reflow oven, stencil printing machine, SMT production line nezvimwe Zvigadzirwa zveSMT.Isu tine yedu R & D timu uye fekitori pachedu, tichitora mukana weiyo yedu yakapfuma ine ruzivo R&D, yakanyatso dzidziswa kugadzirwa, yakawana mukurumbira mukuru kubva kune vatengi pasi rese.
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Nguva yekutumira: May-05-2023