Kugadziriswa kweEMC kweMota Isina Mabhurashi Inokasira

1. Zvinokonzera EMC uye matanho ekudzivirira

Mumamota asingashandise mabhurashi anomhanya zvakanyanya, matambudziko eEMC anowanzo kuve chinhu chinonyanya kuomera purojekiti yese, uye maitiro ekugadzirisa EMC yese anotora nguva yakawanda. Saka, tinofanira kutanga taziva zvikonzero zvinoita kuti EMC ipfuure mwero uye nzira dzekugadzirisa dzinoenderana.

Kugadziriswa kweEMC kunonyanya kutanga kubva kumativi matatu:

• Kuvandudza kwava kukonzera kupindira

Mukutonga kwemamota asingashandise mabhurashi anomhanya zvakanyanya, chinhu chinonyanya kukosha chinokonzera kukanganiswa kwemota iyi idhiraivha ine zvishandiso zvekuchinja zvakaita seMOS neIGBT. Pasina kukanganisa mashandiro emota inomhanya zvakanyanya, kuderedza frequency yemuchina weMCU, kuderedza kumhanya kweswitching tube, uye kusarudza switching tube ine maparameter akakodzera kunogona kuderedza kukanganiswa kweEMC.

• Kuderedza nzira yekubatanidza yenzvimbo yekupindira

Kugadzirisa nzira dzePCBA uye marongerwo adzo kunogona kuvandudza EMC, uye kubatana kwemitsara kune mumwe nemumwe kunokonzera kukanganiswa kukuru. Kunyanya kune mitsara yechiratidzo ine frequency yakakwira, edza kudzivirira marobhoti anoumba zvishwe uye marobhoti anoumba maantenna. Kana zvichidikanwa unogona kuwedzera shielding layer kuderedza coupling.

• Nzira dzekudzivirira kupindira

Chinonyanya kushandiswa mukuvandudza EMC imhando dzakasiyana dze inductances nema capacitors, uye ma parameter akakodzera anosarudzwa kuti pave nekukanganiswa kwakasiyana. Y capacitor ne common mode inductance ndezvekukanganiswa kwe common mode, uye X capacitor ndeyekukanganiswa kwe differential mode. Inductance magnetic ring yakakamurwawo kuita high frequency magnetic ring ne low frequency magnetic ring, uye mhando mbiri dze inductances dzinofanira kuwedzerwa panguva imwe chete kana zvichidikanwa.

2. Nyaya yekugadzirisa EMC

Mukugadzirisa EMC yemota isina mabhurashi ye100,000-rpm yekambani yedu, heano mamwe mapoinzi akakosha andinotarisira kuti achabatsira munhu wese.

Kuti mota isvike pakumhanya kwakanyanya kwezviuru zana zvema revolutions, frequency yekutanga yekutakura yakaiswa ku40KHZ, iyo yakapetwa kaviri pane mamwe mamota. Muchiitiko ichi, dzimwe nzira dzekugadzirisa hadzina kukwanisa kuvandudza EMC zvinobudirira. Frequency inoderedzwa kusvika ku30KHZ uye huwandu hwenguva dzekuchinja kweMOS hunoderedzwa ne1/3 usati wavandudzika zvakanyanya. Panguva imwe chete, zvakaonekwa kuti Trr (reverse recovery time) ye reverse diode yeMOS ine simba paEMC, uye MOS ine reverse recovery time yakasarudzwa. Data rekuyedza riri sezvakaratidzwa mumufananidzo uri pazasi. Margin ye500KHZ~1MHZ yakawedzera neinenge 3dB uye spike waveform yaderedzwa:

Nekuda kwekugadzirwa kwakakosha kwePCBA, kune tambo mbiri dzemagetsi dzine simba guru dzinofanira kusanganiswa nedzimwe tambo dzechiratidzo. Mushure mekunge tambo ine simba guru yachinjwa kuita peya yakamonyoroka, kupindirana pakati pema leads kunova kudiki zvikuru. Data rekuyedza riri sezvakaratidzwa mumufananidzo uri pazasi, uye muganhu we24MHZ wakawedzera neinenge 3dB:

Muchiitiko ichi, ma inductor maviri e common-mode anoshandiswa, rimwe rawo i ring yemagineti ine frequency yakaderera, ine inductance inosvika 50mH, iyo inovandudza zvakanyanya EMC muhukuru hwe 500KHZ ~ 2MHZ. Rimwe i ring yemagineti ine frequency yakakwirira, ine inductance inosvika 60uH, iyo inovandudza zvakanyanya EMC muhukuru hwe 30MHZ ~ 50MHZ.

Ruzivo rwekuyedza rwering yemagineti ine frequency yakaderera rwunoratidzwa mumufananidzo uri pazasi, uye muganhu wese unowedzerwa ne2dB munzvimbo ye300KHZ~30MHZ:

Ruzivo rwekuyedza rwemhete yemagineti ine frequency yakakwira runoratidzwa mumufananidzo uri pazasi, uye muganho unowedzerwa neinopfuura 10dB:

Ndinovimba kuti munhu wese anogona kuchinjana mafungiro uye kukurukura nezvekugadzirisa EMC, uye kuwana mhinduro yakanakisisa mukuyedza nguva dzose.