Kumelwe kube obunye bobunzima bokushintsha ukunikezwa kwamandla ukuze kusetshenziswe eyinkimbinkimbi PCB ibhodi (umklamo we-PCB ongemuhle ungaholela esimeni sokuthi noma ngabe amapharamitha alungiswa kanjani, akusona i-alamu). Isizathu siwukuthi kusekhona izici eziningi ezicatshangelwa lapho ukuhlelwa kwe-PCB, okufana: ukusebenza kukagesi, umzila wenqubo, izidingo zokuphepha, ithonya le-EMC, njll. Phakathi kwezici ezicatshangelwayo, ugesi uyisisekelo kakhulu, kodwa i-EMC inzima kakhulu ukuyiqonda. . , Inkinga yenqubekelaphambili yamaphrojekthi amaningi isenkingeni ye-EMC; ake sabelane nawe ngesakhiwo se-PCB kanye ne-EMC kusuka eziqondisweni ezingu-22.

Yiziphi izinkinga ze-EMC okufanele zicatshangelwe lapho ukwakheka kwe-PCB?

1. Isekethe ye-EMI yomklamo we-PCB ingenziwa ngokuthula ngemva kokujwayelana nesekhethi.

Umthelela wesekethe engenhla ku-EMC ungacatshangwa. Isihlungi ekugcineni kokufaka silapha; ingcindezi ezwelayo ekuvikeleni umbani; ukumelana no-R102 ukuvimbela i-inrush current (sebenzisana ne-relay ukunciphisa ukulahlekelwa); ukucatshangelwa okuyinhloko imodi yokuhlukanisa i-X capacitor kanye ne-Inductance ifaniswe ne-Y capacitor yokuhlunga; kukhona futhi ama-fuse athinta ukuhlelwa kwebhodi lokuphepha; idivayisi ngayinye lapha ibaluleke kakhulu, futhi kufanele ujabulele ngokucophelela umsebenzi nendima yedivayisi ngayinye. Izinga lokuqina le-EMC okufanele licatshangelwe lapho kuklanywa isekethe yakhelwe ngokuthula, njengokusetha amazinga amaningana okuhlunga, inani lama-capacitor angu-Y, kanye nendawo. Ukukhethwa kosayizi we-varistor kanye nenani kuhlobene eduze nesidingo sethu se-EMC. Yamukela wonke umuntu ukuze nixoxe ngomjikelezo we-EMI obonakala ulula, kodwa ingxenye ngayinye iqukethe iqiniso elijulile.

2. Isekethe ne-EMC: (I-flyback main topology eyaziwa kakhulu, bona ukuthi yiziphi izindawo ezibalulekile kusekethe eziqukethe indlela ye-EMC).

Kunezingxenye eziningana kumjikelezo esithombeni esingenhla: umthelela we-EMC ubaluleke kakhulu (qaphela ukuthi ingxenye eluhlaza ayikho), njengemisebe, wonke umuntu uyazi ukuthi imisebe ye-electromagnetic field iyindawo, kodwa isimiso esiyisisekelo ukushintsha i-magnetic flux, ehlobene nendawo esebenzayo ye-cross-sectional field magnetic. , Okuyiluphu ehambisanayo kusekethe. Amandla kagesi angakhiqiza insimu yamagnetic, ikhiqiza insimu yamagnetic ezinzile, engakwazi ukuguqulwa ibe insimu kagesi; kodwa ukushintshashintsha kwamanje kukhiqiza insimu yamagnetic eshintshayo, futhi insimu yamagnetic eshintshayo ingakhiqiza insimu kagesi (empeleni, lena yi-equation edumile kaMaxwell, ngisebenzisa ulimi olulula), ushintsho Ngendlela efanayo, insimu kagesi ingakwazi ukukhiqiza i-magnetic equation. inkambu. Ngakho-ke qiniseka ukuthi unaka lezo zindawo ezine-switch states, okungenye yemithombo ye-EMC, nansi enye yemithombo ye-EMC (lapha, vele, ngizokhuluma ngezinye izici kamuva); isibonelo, iluphu enamachashazi kusekethe wukuvulwa kweshubhu yokushintsha. Futhi i-loop evaliwe, hhayi kuphela isivinini sokushintsha esingashintshwa ukuze sithinte i-EMC lapho uklama isifunda, kodwa futhi indawo eyiluphu yesakhiwo sebhodi inomthelela obalulekile! Amanye amalophu amabili yiluphu yokumuncwa kanye neluphu yokulungisa. Funda ngakho kusengaphambili futhi ukhulume ngakho kamuva!

3. Ukuhlangana phakathi kwe-PCB design kanye ne-EMC.

1). Umthelela weluphu ye-PCB ku-EMC ubaluleke kakhulu, njenge-flyback main loop yamandla. Uma inkulu kakhulu, imisebe izoba mbi.

2). Umthelela wezintambo wesihlungi. Isihlungi sisetshenziselwa ukuhlunga ngaphandle kokuphazanyiswa, kodwa uma izintambo ze-PCB zingezinhle, isihlungi singase silahlekelwe umphumela okufanele sibe nawo.

3). Engxenyeni yesakhiwo, ukusekela phansi okungalungile komklamo we-radiator kuzothinta ukumiswa kwenguqulo evikelekile, njll.

4). Izingxenye ezizwelayo ziseduze kakhulu nomthombo wokuphazamiseka, njengesekhethi ye-EMI kanye neshubhu yokushintsha iseduze kakhulu, nakanjani izoholela ku-EMC embi, futhi indawo ecacile yokuhlukanisa iyadingeka.

5). I-RC yokumuncwa umjikelezo wesifunda.

6). I-Y capacitor igxiliwe futhi ihanjiswa, futhi indawo ye-Y capacitor nayo ibalulekile, njalonjalo.