Xa kwakhiwa i-multilayer ceramic capacitors (MLCCs), iinjineli zombane zihlala zikhetha iindidi ezimbini ze-dielectric ngokuxhomekeke kwisicelo - i-Class 1, i-non-ferroelectric material dielectrics efana ne-C0G / NP0, kunye ne-Class 2, i-dielectric material dielectric efana ne-X5R kunye ne-X7R.Umahluko ophambili phakathi kwabo kukuba ingaba i-capacitor, ene-voltage eyandayo kunye nobushushu, isenozinzo oluhle.Kwi-dielectrics ye-Class 1, i-capacitance ihlala izinzile xa i-voltage ye-DC isetyenzisiwe kunye nokushisa okusebenzayo kuphakama;I-dielectrics yeklasi ye-2 ine-dielectric constant constant (K), kodwa i-capacitance ayizinzile ngaphantsi kweenguqu zeqondo lokushisa, i-voltage, i-frequency kunye nexesha.
Nangona i-capacitance inokunyuswa ngotshintsho oluhlukeneyo loyilo, njengokutshintsha indawo yomgangatho we-electrode layers, inani leeleyile, ixabiso le-K okanye umgama phakathi kweeleyile ezimbini ze-electrode, i-capacitance ye-Dielectrics ye-Class 2 ekugqibeleni iya kuhla ngokukhawuleza kufakwe amandla ombane eDC.Oku kungenxa yobukho besenzeko esibizwa ngokuba yi-DC bias, ebangela ukuba udidi lwesi-2 lwemixube yeferroelectric lufumane ukwehla kokungaguquguquki kwedielectric xa kusetyenziswa umbane weDC.
Kwixabiso eliphezulu le-K lezinto ze-dielectric, umphumo we-DC bias unokuba nzima ngakumbi, kunye nee-capacitors ezinokuthi zilahlekelwe ukuya kuma-90% okanye ngaphezulu kwamandla abo, njengoko kubonisiwe kumzobo.
Amandla edielectric esixhobo, oko kukuthi amandla ombane anokumelana nobukhulu obunikiweyo, anokutshintsha isiphumo se-DC bias kwi-capacitor.E-USA, amandla e-dielectric adla ngokulinganiswa ngee-volts/mil (1 mil ilingana ne-0.001 intshi), kwenye indawo ilinganiswa nge-volts/micron, kwaye igqitywe ngobuninzi boluhlu lwe-dielectric.Ngenxa yoko, ii-capacitors ezahlukeneyo ezine-capacitance efanayo kunye ne-voltage rating inokusebenza ngokuhlukileyo kakhulu ngenxa yezakhiwo zabo zangaphakathi ezahlukeneyo.
Kuyafaneleka ukuba uqaphele ukuba xa i-voltage esetyenzisiweyo inkulu kunamandla e-dielectric yezinto eziphathekayo, iintlantsi ziya kudlula kwizinto eziphathekayo, ezikhokelela ekutshatyalalisweni okunokwenzeka okanye umngcipheko omncinci wokuqhuma.
Imizekelo esebenzayo yendlela i-DC bias eyenziwa ngayo
Ukuba siqwalasela utshintsho kwi-capacitance ngenxa ye-voltage yokusebenza ngokubambisana nokutshintsha kweqondo lokushisa, ngoko sifumanisa ukuba ukulahleka kwe-capacitance ye-capacitor kuya kuba kukhulu kwiqondo lokushisa elithile lesicelo kunye nombane we-DC.Thatha umzekelo i-MLCC eyenziwe nge-X7R ene-capacitance ye-0.1µF, i-voltage elinganisiweyo ye-200VDC, isibalo sangaphakathi sangaphakathi se-35 kunye nobukhulu be-1.8 mils (0.0018 intshi okanye i-45.72 microns), oku kuthetha ukuba xa usebenza kwi-200VDC i-dielectric umaleko kuphela amava 111 volts/mil okanye 4.4 volts/micron.Ukubala okurhabaxa, iVC iya kuba yi-15%.Ukuba i-coefficient yokushisa ye-dielectric ± 15% ΔC kunye ne-VC yi-15% ΔC, ngoko i-TVC ephezulu yi- + 15% - 30% ΔC.
Isizathu solu tshintsho silele kwi-crystal structure ye-Class 2 yezinto ezisetyenzisiweyo - kule meko i-barium titanate (BaTiO3).Esi sixhobo sinesakhiwo se-cubic crystal xa ukushisa kweCurie kufikeleleke okanye ngaphezulu.Nangona kunjalo, xa iqondo lokushisa libuyela kwiqondo lokushisa eliqhelekileyo, i-polarization iyenzeka njengoko ukuhla kweqondo lokushisa kubangela ukuba izinto zitshintshe isakhiwo sayo.I-polarization yenzeke ngaphandle kwayo nayiphi na indawo yombane yangaphandle okanye uxinzelelo kwaye oku kwaziwa njengepolarization ezenzekelayo okanye i-ferroelectricity.Xa i-voltage ye-DC isetyenziswa kwizinto ezikwiqondo lobushushu elijikelezayo, i-polarization ezenzekelayo idityaniswe kwicala lombane wombane we-DC kwaye ukuguqulwa kwe-polarization ezenzekelayo kwenzeka, okukhokelela ekunciphiseni kwe-capacitance.
Kule mihla, kunye nezixhobo ezahlukeneyo zoyilo ezikhoyo zokwandisa amandla, amandla eDielectrics yodidi lwesi-2 asancipha kakhulu xa kusetyenziswa umbane weDC ngenxa yobukho be-DC bias phenomenon.Ngoko ke, ukuze uqinisekise ukuthembeka kwexesha elide lesicelo sakho, kufuneka uthathele ingqalelo impembelelo ye-DC bias kwicandelo ukongeza kwi-capacitance ye-MLCC xa ukhetha i-MLCC.
I-Zhejiang NeoDen Technology Co., LTD., Yasekwa ngo-2010, ngumvelisi oqeqeshiweyo okhethekileyo kwi-SMT pick and place machine, i-oven reflow, umatshini wokushicilela we-stencil, umgca wemveliso we-SMT kunye nezinye iiMveliso ze-SMT.Sineqela lethu le-R & D kunye nemizi-mveliso yethu, sithatha ithuba le-R&D yethu etyebileyo, imveliso eqeqeshwe kakuhle, yaphumelela igama elihle kubathengi behlabathi ngokubanzi.
Sikholelwa ukuba abantu abakhulu kunye namahlakani enza iNeoDen ibe yinkampani enkulu kwaye ukuzinikela kwethu kuTshintsho, iyantlukwano kunye noZinzo kuqinisekisa ukuba i-SMT automation iyafikeleleka kuye wonke umntu othanda ukuzonwabisa kuyo yonke indawo.
Ixesha lokuposa: May-05-2023