Dole ne ya zama ɗaya daga cikin matsalolin canza wutar lantarki don tura naɗaɗɗen Kwamitin PCB (Matsalar ƙirar PCB na iya haifar da halin da ake ciki cewa ko ta yaya aka lalata sigogi, ba mai faɗa ba ne). Dalilin shi ne cewa har yanzu akwai abubuwa da yawa da aka yi la’akari da su lokacin da PCB layout, kamar: aikin lantarki, tsarin sarrafawa, bukatun aminci, tasirin EMC, da dai sauransu. Daga cikin abubuwan da aka yi la’akari, lantarki shine mafi mahimmanci, amma EMC shine mafi wuyar fahimta. . , Ƙarƙashin ci gaban ayyukan da yawa yana cikin matsalar EMC; bari mu raba tare da ku shimfidar PCB da EMC daga kwatance 22.

Wadanne batutuwan EMC ya kamata a yi la’akari da su yayin shimfidar PCB?

1. Za’a iya aiwatar da da’irar EMI na ƙirar PCB cikin nutsuwa bayan sanin da’irar.

Ana iya tunanin tasirin da’irar da ke sama akan EMC. Tace a ƙarshen shigarwa yana nan; matsi mai mahimmanci don kariyar walƙiya; da juriya R102 don hana inrush halin yanzu (aiki tare da gudun ba da sanda don rage asarar); Mahimmin la’akari shine yanayin bambancin yanayin X capacitor da kuma Inductance yana daidaita tare da Y capacitor don tacewa; akwai kuma fuses waɗanda ke shafar shimfidar allon tsaro; kowace na’ura a nan tana da matukar mahimmanci, kuma dole ne a hankali ku ɗanɗana aiki da rawar kowace na’ura. Matsayin tsananin EMC wanda dole ne a yi la’akari da shi lokacin zayyana da’ira an tsara shi cikin nutsuwa, kamar saita matakan tacewa da yawa, adadin masu ƙarfin Y, da wurin. Zaɓin girman varistor da yawa yana da alaƙa da alaƙa da buƙatar mu na EMC. Maraba da kowa don tattauna da’irar EMI mai sauƙi, amma kowane ɓangaren yana ɗauke da gaskiya mai zurfi.

2. Da’irar da EMC: (Mafi sanin manyan abubuwan da aka fi sani da flyback main topology, duba waɗanne mahimman wurare a cikin da’irar sun ƙunshi tsarin EMC).

Akwai sassa da yawa a cikin da’irar a cikin adadi na sama: tasiri akan EMC yana da mahimmanci (lura cewa ɓangaren kore ba shi da), kamar radiation, kowa ya san cewa radiation filin lantarki yana da sararin samaniya, amma ainihin ka’idar ita ce canji na Magnetic flux, wanda ke da alaƙa da ingantaccen yanki na yanki na filin maganadisu. , Wanda shine madaidaicin madauki a cikin kewaye. Lantarki na iya samar da filin maganadisu, yana samar da filin maganadisu tsayayye, wanda ba za a iya canza shi zuwa filin lantarki ba; amma canjin yanayi yana haifar da filin maganadisu mai canzawa, kuma filin maganadisu yana iya samar da filin lantarki (a zahiri, wannan shine sanannen ma’aunin Maxwell, ina amfani da yare a sarari), canji Hakazalika, filin lantarki yana iya samar da injin maganadisu. filin. Don haka tabbatar da kula da waɗancan wuraren da ke da jihohin sauya, wato ɗaya daga cikin hanyoyin EMC, ga ɗaya daga cikin tushen EMC (a nan, ba shakka, zan yi magana game da wasu fannoni daga baya); alal misali, madauki mai digo a cikin kewaye shine buɗe bututun sauya. Kuma rufaffiyar madauki, ba kawai saurin sauyawa ba za’a iya daidaitawa don shafar EMC lokacin zayyana da’ira, amma har ma da madauki na shimfidar jirgi yana da tasiri mai mahimmanci! Sauran madaukai biyu sune madauki na sha da madauki na gyarawa. Koyi game da shi a gaba kuma ku yi magana game da shi daga baya!

3. Ƙungiyar tsakanin ƙirar PCB da EMC.

1). Tasirin madauki na PCB akan EMC yana da matuƙar mahimmanci, kamar madaidaicin madaidaicin wutar lantarki. Idan ya yi girma sosai, radiation zai zama mara kyau.

2). Tasirin wayoyi na tacewa. Ana amfani da tacewa don tace tsangwama, amma idan wayar PCB ba ta da kyau, tacewa na iya rasa tasirin da ya kamata ya yi.

3). A cikin tsarin tsarin, ƙarancin ƙasa na ƙirar radiator zai shafi ƙasan sigar kariya, da sauransu.

4). Sassan hankali sun yi kusa da tushen tsangwama, kamar kewayen EMI da bututun sauyawa suna kusa sosai, babu makawa zai kai ga rashin EMC mara kyau, kuma ana buƙatar fili keɓewa.

5). RC absorption da’ira kewayawa.

6). Na’urar Y capacitor yana ƙasa kuma an binne shi, kuma wurin Y capacitor yana da mahimmanci, da sauransu.