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Yakajairika Modhi Noise Sefa Uchishandisa Monolithic EMI Mafirita

Kunyangwe zvakajairika nzira yekudzipa ichizivikanwa, imwe nzira inogona kunge iri monolithic EMI sefa. Kana yakanyatsoiswa, aya akawanda machira eceramic zvikamu zvinopa zvakanakisa zvakajairika-modhi yekuramba ruzha.
Zvinhu zvakawanda zvinowedzera kuwanda kwe "ruzha" kukanganisa kunogona kukanganisa kana kukanganisa kushanda kwemidziyo yemagetsi.Mota dzemazuvano muenzaniso wakanaka.Mumotokari munowana Wi-Fi, Bluetooth, satellite radio, GPS masisitimu, uye ndiko kuchangotanga.Kugadzirisa kukanganiswa kweruzha uku, indasitiri inowanzoshandisa zvivharo uye masefa eEMI kubvisa ruzha rusingadiwi.Asi dzimwe nzira dzechinyakare dzekubvisa EMI/RFI hadzina kukwana.
Dambudziko iri rinotungamira maOEM mazhinji kudzivirira kushandisa 2-capacitor musiyano, 3-capacitor (imwe X capacitor uye 2 Y capacitor), feedthrough mafirita, yakajairika modhi inodzipwa, kana musanganiswa weizvi kune imwe mhinduro yakakodzera senge monolithic EMI sefa ine. nani kurambwa ruzha mune diki package.
Kana michina yemagetsi inogamuchira mafungu akasimba emagetsi, mafungu asingadiwe anogona kukweverwa mudunhu uye kukonzera kushanda kusingatarisirwe - kana kukanganisa kushanda kwakarongwa.
EMI/RFI inogona kunge iri muchimiro chezvinoitwa kana kuti radiation emissions.Kana EMI ichiitwa, zvinoreva kuti ruzha runofamba nemagetsi conductor.Radiated EMI inoitika kana ruzha runofamba mumhepo nenzira yemagineti kana masaisai eredhiyo.
Kunyange kana simba rinoshandiswa kubva kunze riri duku, kana richisanganiswa nemasaisai eredhiyo anoshandiswa pakutepfenyura uye kutaurirana, zvinogona kukonzera kurasikirwa kwekugamuchira, ruzha rusina kujairika mukunzwika, kana kukanganisa kwevhidhiyo.Kana simba racho rakanyanyisa, rinogona kukonzera kurasikirwa kwekugamuchira. kukuvadza midziyo yemagetsi.
Zvitubu zvinosanganisira ruzha rwechisikigo (semuenzaniso, electrostatic discharge, mwenje, uye kumwe kunobva) uye ruzha rwakagadzirwa nevanhu (semuenzaniso, ruzha rwekubata, midziyo inobuda uchishandisa ma frequency epamusoro, kuburitswa kusingadiwi, zvichingodaro). Kazhinji, EMI/RFI ruzha runowanzo mumoti ruzha. , saka mhinduro ndeyokushandisa EMI sefa kubvisa zvisingadiwi yakakwirira frequencies, ingave sechinhu chakasiyana kana chakaiswa mubhodhi redunhu.
EMI Mafirita EMI mafirita anowanzo sanganisira zvinhu zvisingaite, senge capacitors uye inductors, izvo zvakabatana kuita dunhu.
"Mainductor anobvumira DC kana yakaderera-frequency ikozvino kuti ipfuure apo ichivhara zvisingadiwi, zvisingadiwi yakakwirira-frequency currents.Macapacitors anopa nzira yakaderera-impedance yekutsausa ruzha rwepamusoro-soro kubva pakupinza kwesefa kune simba kana kubatanidza pasi, "Manufactures a Multilayer Ceramic akadaro Christophe Cambrelin wekambani capacitor Johanson Dielectrics.EMI sefa.
Nzira dzechinyakare dzekusefa dzinosanganisira mafirita akaderera-pasi achishandisa macapacitor anopfuudza masaini ane ma frequency pazasi peakasarudzwa cutoff frequency uye attenuate masaini nema frequency pamusoro peiyo cutoff frequency.
Chinhu chinowanzoitika ndechekuisa peya ye capacitor mukusiyana kwekugadzirisa, ine imwe capacitor pakati pekutsvaga kwega kwega kwega kwega uye pasi.Capacitive filters mugumbo rimwe nerimwe shandura EMI / RFI pasi pamusoro peiyo yakatarwa cutoff frequency. kutumira masaini ezvikamu zvakapesana pamusoro pewaya mbiri, chiratidzo-ku-ruzha reshiyo inovandudzwa nepo ruzha rusingadiwi rwunotumirwa pasi.
"Zvinosuruvarisa, iyo capacitance value yeMLCCs ine X7R dielectrics (inowanzo shandiswa basa iri) inogona kusiyanisa zvakanyanya nenguva, bias voltage uye tembiricha," akadaro Cambrelin.
"Saka kunyangwe maviri ma capacitor achinyatsoenderana panguva yakapihwa tembiricha yekamuri pane yakaderera voltage, anogona kupedzisira ave nemhando dzakasiyana kana nguva, voltage kana tembiricha zvachinja.Kusapindirana kwewaya mbiri idzi kunozokonzera mhinduro dzisina kuenzana pedyo nekuchekwa kwesefa.Naizvozvo, inoshandura ruzha-ruzha kuita ruzha rwakasiyana. "
Imwe mhinduro ndeye bhiriji kukosha kukuru "X" capacitor pakati pe "Y" capacitors. "X" capacitive shunt inopa yakanakira common-mode balance, asi inewo isingadiwi mhedzisiro yekusiyanisa chiratidzo kusefa.Zvichida mhinduro inowanzoitika. uye imwe nzira kune yakaderera pass sefa ndeye yakajairika modhi yakachinga.
A common mode kukachidzwa ndeye 1: 1 transformer ine zvese zviri zviviri windings ichiita seyepuraimari uye yechipiri.Munzira iyi, yazvino kuburikidza neimwe inomonereka inopinza yakatarisana neyazvino mune imwe mhepo.Sezvineiwo, zvinojairika maitiro anodzipwa zvakare anorema, anodhura, uye anotapukirwa. kukundikana kunokonzerwa nekudengenyeka.
Zvakadaro, akakodzera common modhi anodzipwa pamwe akakwana kuenzanirana uye coupling pakati windings iri pachena kune musiyano zviratidzo uye ane yakakwirira impedance kuti common mode noise.Kumwe kusaipira common mode anodzipwa ndiyo shoma frequency renji nokuda parasitic capacitance.Kune yakapiwa musimboti zvinhu. , iyo yakakwirira inductance inoshandiswa kuwana yakaderera frequency kusefa, iyo yakawanda inotendeuka inodiwa, nokudaro zvichikonzera parasitic capacitances isingakwanisi kupfuura yakakwirira frequency kusefa.
Kusawirirana pakati pema windings nekuda kwe mechanical kushivirira kwekugadzira kunokonzera mode switching, apo chikamu chesimba rechiratidzo chinoshandurwa kune common mode ruzha uye zvinopesana.Mamiriro ezvinhu aya anogona kukonzera electromagnetic kuenderana uye nyaya dzekudzivirira.Kusawirirana kunoderedzawo kushanda kunobudirira kwegumbo rimwe nerimwe.
Chero zvazvingaitika, zvakajairika modhi inodzipa inopa mabhenefiti akakosha pane dzimwe sarudzo kana chiratidzo chekusiyanisa (chipfuura) chichishanda mune imwechete frequency renji seyakajairwa modhi ruzha runofanira kurambwa. Uchishandisa yakajairwa mode inodzipa, chiratidzo chepasi chinogona kuwedzerwa. kune common mode rejection band.
Monolithic EMI Mafirita Kunyangwe zvakajairika modhi yakachinga yakakurumbira, monolithic EMI mafirita anogona zvakare kushandiswa. Kana akaiswa zvakanaka, aya multilayer ceramic zvikamu zvinopa yakanakisa yakajairika-modhi yekuramba ruzha.Inosanganisa maviri akaenzanirana shunt capacitor mupakeji imwe yekubatirana inductance kudzima uye kudzivirira. .Masefa aya anoshandisa nzira mbiri dzemagetsi dzakaparadzana mukati memudziyo mumwe chete wakabatanidzwa kune mana ekunze.
Kuti udzivise kuvhiringidzika, zvinofanira kucherechedzwa kuti monolithic EMI filters haisi yechinyakare feedthrough capacitors.Kunyange zvazvo inotarisa zvakafanana (yakafanana kurongedza uye kuonekwa), iyo yakasiyana zvikuru mukugadzira, uye haina kubatanidzwa nenzira imwechete.Sezvimwe EMI imwe chete. mafirita, monolithic EMI mafirita anodzora simba rese pamusoro peiyo yakatemwa cutoff frequency uye sarudza kupfuudza chete yaidiwa chiratidzo simba, uku uchitsausa ruzha rusingadiwe ku "pasi".
Zvisinei, kiyi yakanyanya kuderera inductance uye inoenderana impedance.Kune monolithic EMI filters, zviteshi zvinobatanidzwa mukati kune imwe nzvimbo yereferensi (nhovo) electrode mukati memudziyo, uye mahwendefa anoparadzaniswa nereferensi electrode.Electrostatically, matatu magetsi nodes. anoumbwa neaviri capacitive halves anogovera akajairwa referensi electrode, ese ari mukati meimwe chete ceramic body.
Chiyero pakati pezvikamu zviviri zve capacitor zvinorevawo kuti piezoelectric migumisiro yakaenzana uye inopesana, ichidzima imwe neimwe kunze.Ukama uhwu hunokanganisawo kushanduka kwekushisa uye kushanduka kwemagetsi, saka zvikamu pamitsara miviri zera zvakaenzana.Kana pane imwe yakaderera kune idzi monolithic EMI mafirita, ndezvekuti haashande kana ruzha-ruzha rwuri panguva yakafanana neyekusiyanisa chiratidzo.
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Iyo yepamusoro-soro yepasi-yekugadzirisa matambudziko EE foramu inovhara mamicrocontrollers, DSP, networking, analog uye dijitari dhizaini, RF, magetsi emagetsi, PCB routing, nezvimwe.
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Nguva yekutumira: Kubvumbi-19-2022