Iyenera kukhala imodzi mwazovuta zosinthira magetsi kuti atumize makina apamwamba kwambiri PCB bolodi (mawonekedwe olakwika a PCB angayambitse vuto kuti ngakhale magawo asinthidwa bwanji, sizowopsa). Chifukwa chake ndi chakuti pali zinthu zambiri zomwe zimaganiziridwa pamene masanjidwe a PCB, monga: magwiridwe antchito amagetsi, kuwongolera njira, zofunikira zachitetezo, chikoka cha EMC, ndi zina zambiri. . , Cholepheretsa kupita patsogolo kwa ntchito zambiri chili mu vuto la EMC; tiyeni tigawane nanu mawonekedwe a PCB ndi EMC kuchokera mbali 22.

Ndi nkhani ziti za EMC zomwe ziyenera kuganiziridwa mukamakonza PCB?

1. Dera la EMI la mapangidwe a PCB lingathe kuchitidwa modekha mutadziwa bwino dera.

Zotsatira za dera lomwe lili pamwambapa pa EMC lingathe kuganiziridwa. Zosefera pamapeto zolowetsa zili pano; kuthamanga kwamphamvu kwa chitetezo cha mphezi; kukana R102 kuteteza inrush panopa (kugwirizana ndi relay kuchepetsa kutayika); Chofunika kwambiri ndi njira yosiyana X capacitor ndi The inductance ikufanana ndi Y capacitor yosefera; palinso ma fuse omwe amakhudza masanjidwe a bolodi lachitetezo; chipangizo chilichonse apa ndi chofunika kwambiri, ndipo muyenera mosamala amasangalala ntchito ndi udindo wa chipangizo chilichonse. Mulingo wovuta wa EMC womwe uyenera kuganiziridwa popanga chigawocho udapangidwa modekha, monga kukhazikitsa magawo angapo a kusefa, kuchuluka kwa ma capacitor a Y, ndi malo. Kusankhidwa kwa kukula kwa varistor ndi kuchuluka kwake kumagwirizana kwambiri ndi zomwe tikufuna pa EMC. Landirani aliyense kuti akambirane gawo losavuta la EMI, koma gawo lililonse lili ndi chowonadi chozama.

2. Circuit and EMC: (Njira yodziwika bwino ya flyback main topology, onani malo ofunikira omwe ali ndi makina a EMC).

Pali magawo angapo ozungulira mu chithunzi pamwambapa: kukhudzidwa kwa EMC ndikofunikira kwambiri (zindikirani kuti gawo lobiriwira silili), monga ma radiation, aliyense amadziwa kuti ma radiation akumunda amagetsi ndi otalikirapo, koma mfundo yayikulu ndikusintha kwa maginito flux, yomwe imakhudzana ndi gawo logwira ntchito la maginito. , Chomwe chiri chozungulira chogwirizana mu dera. Mphamvu yamagetsi imatha kupanga maginito, imapanga mphamvu yamagetsi yokhazikika, yomwe singasinthidwe kukhala magetsi; koma kusintha kwamakono kumapanga kusintha kwa maginito, ndipo kusintha kwa maginito kungapangitse mphamvu yamagetsi (kwenikweni, iyi ndi Maxwell equation yotchuka, ndimagwiritsa ntchito chinenero chomveka), kusintha Momwemonso, mphamvu yamagetsi imatha kupanga maginito. munda. Chifukwa chake onetsetsani kuti mukuyang’ana malo omwe ali ndi masinthidwe osinthira, omwe ndi amodzi mwamagwero a EMC, nayi amodzi mwamagwero a EMC (apa, ndithudi, ndikambirana zina pambuyo pake); mwachitsanzo, kuzungulira kwa madontho kuzungulira ndikutsegula kwa chubu. Ndipo kuzungulira kotsekedwa, osati kuthamanga kokha kosinthika komwe kungasinthidwe kuti kukhudze EMC popanga dera, komanso malo ozungulira a board board ali ndi gawo lofunikira! Malupu ena awiri ndi loop yoyamwitsa ndi loop yokonzanso. Phunzirani za izo pasadakhale ndi kukambirana za izo pambuyo pake!

3. Mgwirizano pakati pa mapangidwe a PCB ndi EMC.

1). Zotsatira za PCB loop pa EMC ndizofunikira kwambiri, monga flyback main power loop. Ngati ndi yayikulu kwambiri, ma radiation amakhala ochepa.

2). Mphamvu ya waya ya fyuluta. Fyulutayo imagwiritsidwa ntchito kusefa kusokoneza, koma ngati ma waya a PCB sali abwino, fyulutayo imatha kutaya mphamvu yomwe iyenera kukhala nayo.

3). Pamapangidwe ake, kusakhazikika bwino kwa mapangidwe a radiator kudzakhudza kukhazikika kwa mtundu wotetezedwa, ndi zina zambiri.

4). Zigawo zomveka zili pafupi kwambiri ndi gwero la kusokoneza, monga dera la EMI ndi chubu chosinthira chili pafupi kwambiri, zidzatsogolera ku EMC yosauka, ndipo malo odzipatula omveka bwino amafunika.

5). RC mayamwidwe wozungulira mayendedwe.

6). Y capacitor imayikidwa pansi ndikuyendetsedwa, ndipo malo a Y capacitor ndi ovuta, ndi zina zotero.