Nakuba ukuklinywa kwemodi evamile kudumile, okunye kungase kube isihlungi se-EMI se-monolithic. Uma sibekwe kahle, lezi zingxenye ze-ceramic zezingxenye eziningi zihlinzeka ngokuhle kakhulu ukwenqaba umsindo wemodi evamile.
Izinto eziningi zandisa inani "lomsindo" wokuphazamiseka okungalimaza noma kuphazamise ukusebenza kwemishini kagesi. Izimoto zanamuhla ziyisibonelo esihle kakhulu. Emotweni, uzothola i-Wi-Fi, i-Bluetooth, umsakazo wesathelayithi, izinhlelo ze-GPS, kanye lokho kuyisiqalo nje.Ukulawula lokhu kuphazamiseka komsindo, imboni ngokuvamile isebenzisa izihlungi zokuvikela kanye ne-EMI ukuze isuse umsindo ongafuneki.Kodwa ezinye izixazululo zendabuko zokuqeda i-EMI/RFI azisanele.
Le nkinga iholela ama-OEM amaningi ukuthi agweme ukusebenzisa umehluko we-2-capacitor, 3-capacitor (i-X capacitor eyodwa kanye ne-2 Y capacitor), izihlungi ze-feedthrough, ukuminyanisa kwemodi evamile, noma inhlanganisela yalokhu ukuze uthole isixazululo esifaneleka kangcono njengesihlungi se-EMI se-monolithic esine. ukwenqatshwa okungcono komsindo ephaketheni elincane.
Lapho okokusebenza kwe-elekthronikhi kuthola amaza kagesi anamandla, amaza angafuneki angangenwa kusekethe futhi abangele ukusebenza okungahlosiwe - noma aphazamise ukusebenza okuhlosiwe.
I-EMI/RFI ingaba sesimweni sokukhishwa kwezinto ezenziwayo noma ezikhishwa yimisebe.Lapho i-EMI yenziwa, kusho ukuthi umsindo uhamba ngezikhondatha zikagesi.I-EMI evuthayo yenzeka lapho umsindo uhamba emoyeni ngesimo samagnetic fields noma amaza omsakazo.
Ngisho noma amandla asetshenziswa ngaphandle emancane, uma ehlangana namaza omsakazo asetshenziselwa ukusakaza nokuxhumana, angabangela ukulahlekelwa ukwamukela, umsindo ongavamile womsindo, noma ukuphazamiseka kwevidiyo.Uma amandla enamandla kakhulu, angakwazi limaza imishini kagesi.
Imithombo ihlanganisa umsindo wemvelo (isb., ukukhishwa kwe-electrostatic, ukukhanya, neminye imithombo) nomsindo owenziwe umuntu (isb., umsindo wokuxhumana, okokusebenza okuvuzayo kusetshenziswa amaza aphezulu, ukukhishwa okungafunwa, njll.). Ngokuvamile, umsindo we-EMI/RFI uwumsindo wemodi evamile , ngakho-ke isisombululo siwukusebenzisa isihlungi se-EMI ukususa amaza aphezulu angafuneki, njengedivayisi ehlukile noma eshumekwe ebhodini lesifunda.
Izihlungi ze-EMI Izihlungi ze-EMI ngokuvamile zihlanganisa izingxenye ze-passive, njengama-capacitor nama-inductors, axhunywe ukwenza isekethe.
“Ama-Inductors avumela i-DC noma i-low-frequency current ukuthi idlule ngenkathi ivimba amaza amaza aphezulu angafunwa, angafunwa.Ama-Capacitor ahlinzeka ngendlela ene-impedance ephansi ukuze aphambukise umsindo we-high-frequency usuka kokufaka kwesihlungi kumandla noma ekuxhumekeni komhlabathi,” Manufactures a Multilayer Ceramic kusho uChristophe Cambrelin wenkampani ye-capacitor i-Johanson Dielectrics.EMI isihlungi.
Izindlela zokuhlunga ezivamile zemodi evamile zihlanganisa izihlungi zephasi eliphansi zisebenzisa ama-capacitor adlulisa amasignali ngamafrikhwensi angaphansi kwefrikhwensi yokusika ekhethiwe futhi anciphise amasignali ngamafrikhwensi angaphezu kwe-cutoff frequency.
Isiqalo esivamile ukusebenzisa ipheya yama-capacitor ekucushweni okuhlukile, nge-capacitor eyodwa phakathi komkhondo ngamunye wokufakwa okuhlukile kanye nomhlabathi.Izihlungi ezinamandla emlenzeni ngamunye zidlulisela i-EMI/RFI phansi ngaphezu kwefrikhwensi yokusika eshiwo.Njengoba lokhu kulungiselelwa kuhilela ukuthumela amasignali ezigaba eziphambene phezu kwezintambo ezimbili, isilinganiso sesignali-kuya-nomsindo siyathuthukiswa kuyilapho umsindo ongadingeki uthunyelwa phansi.
"Ngeshwa, inani le-capacitance ye-MLCCs ene-X7R dielectrics (evame ukusetshenziselwa lo msebenzi) ingahluka kakhulu ngesikhathi, i-voltage ye-bias kanye nokushisa," kusho uCambrelin.
“Ngakho-ke noma ama-capacitor amabili efaniswe eduze ngesikhathi esinikeziwe ekamelweni lokushisa ku-voltage ephansi, kungenzeka agcine enamanani ahluke kakhulu uma isikhathi, i-voltage noma izinga lokushisa lishintsha.Lokhu kungafani phakathi kwezintambo ezimbili kuzoholela ekuphenduleni okungalingani eduze nokunqamuka kwesihlungi.Ngakho-ke, iguqula umsindo wemodi evamile ibe umsindo ohlukile. "
Esinye isisombululo ukuvala inani elikhulu le-capacitor "X" phakathi kwama-capacitor "Y" amabili. I- "X" capacitive shunt inikeza ibhalansi yemodi evamile evamile, kodwa futhi inomphumela ongathandeki ongaseceleni wokuhlunga isignali ehlukile.Mhlawumbe isisombululo esivame kakhulu futhi enye indlela yokuhlunga iphasi eliphansi imodi evamile yokuminyanisa.
Ukuminyanisa kwemodi evamile i-transformer engu-1:1 enamajika womabili asebenza njengesisekelo kanye nesesibili. Kule ndlela, i-current through one mawinding idonsa igagasi eliphambene kwenye ijika. Ngeshwa, ukuklinywa kwemodi evamile nakho kuyasinda, kuyabiza, futhi kulula ukuyithola. ekuhlulekeni okubange ukudlidliza.
Noma kunjalo, imodi evamile yokuminyanisa ehambisana kahle nokuhlangana kahle phakathi kwama-winding ibonakala ngale kumasignali ahlukene futhi inomthelela omkhulu kumsindo wemodi evamile.Okunye okungalungile kokuminyanisa kwemodi evamile ububanzi obulinganiselwe befrikhwensi ngenxa yamandla e-parasitic. , ukuphakama kwe-inductance esetshenziselwa ukuthola ukuhlunga okuphansi kwe-frequency, kudingeka ukuphenduka okuningi, ngaleyo ndlela kubangele amandla e-parasitic angakwazi ukudlulisa ukuhlunga kwe-frequency ephezulu.
Ukungafani phakathi kwama-winding ngenxa yokubekezelelana kokukhiqiza ngomshini kubangela ukushintsha kwemodi, lapho ingxenye yamandla esignali iguqulelwa emsindweni wemodi evamile futhi ngokuphambene nalokho.Lesi simo singabangela ukuhambisana kwe-electromagnetic kanye nezinkinga zokuvikeleka.
Kunoma ikuphi, ukuklinywa kwemodi evamile kunikeza izinzuzo ezibalulekile kunezinye izinketho lapho isignali ehlukanisayo (idlula) isebenza ebangeni lefrikhwensi efanayo nomsindo wemodi evamile okufanele wenqatshwe. ebhendini yokwenqaba yemodi evamile.
Izihlungi ze-EMI ze-Monolithic Nakuba ukuklinywa kwemodi evamile kudumile, izihlungi ze-EMI ze-monolithic nazo zingasetshenziswa.Lapho zibekwe kahle, lezi zingxenye ze-ceramic ze-multilayer zinikeza ukwenqatshwa komsindo wemodi evamile. Zihlanganisa ama-shunt capacitor amabili abhalansi kuphakheji elilodwa ukuze kukhanselwe inductance kanye nokuvikela. .Lezi zihlungi zisebenzisa izindlela zikagesi ezimbili ezihlukene ngaphakathi kwedivayisi eyodwa exhunywe ekuxhumekeni okune kwangaphandle.
Ukuze ugweme ukudideka, kufanele kuqashelwe ukuthi izihlungi ze-EMI ze-monolithic azizona zendabuko feedthrough capacitors.Nakuba zibukeka zifana (ukupakishwa okufanayo nokubukeka), zihluke kakhulu ekuklanyweni, futhi azixhunyiwe ngendlela efanayo.Njengamanye ama-EMI izihlungi, izihlungi ze-EMI ze-monolithic zinciphisa wonke amandla ngaphezu kwe-frequency cutoff eshiwo futhi zikhethe ukudlulisa kuphela amandla esignali oyifunayo, kuyilapho idlulisela umsindo ongafuneki "emhlabathini".
Kodwa-ke, isihluthulelo siyi-inductance ephansi kakhulu kanye ne-impedance ehambisanayo.Ngokuhlunga kwe-EMI ye-monolithic, amatheminali axhunywe ngaphakathi ku-electrode yereferensi evamile (isihlangu) ngaphakathi kwedivayisi, futhi amapuleti ahlukaniswa yi-electrode yesithenjwa.Ngokwe-electrostatic, ama-node amathathu kagesi akhiwa ama-halves amabili e-capacitive ahlanganyela i-electrode yereferensi evamile, konke okuqukethwe ngaphakathi komzimba owodwa we-ceramic.
Ibhalansi phakathi kwama-halves amabili e-capacitor iphinde isho ukuthi imiphumela ye-piezoelectric iyalingana futhi iphambene, ikhansela ngaphandle.Lobu budlelwane buphinde buthinte ukuhlukahluka kwezinga lokushisa kanye nogesi, ngakho izingxenye kuyo yomibili imigqa ziyakhula ngokulinganayo. izihlungi, kungukuthi ngeke zisebenze uma umsindo wemodi evamile usemvamisa efanayo neyesiginali yokuhlukanisa.”Kulokhu, ukuminyanisa okujwayelekile kuyisixazululo esingcono,” kusho uCambrelin.
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Isikhathi sokuthumela: Apr-19-2022
